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📄 __init__.py # module pyparsing.py # # Copyright (c) 2003-2022 Paul T. McGuire # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # __doc__ = """ pyparsing module - Classes and methods to define and execute parsing grammars ============================================================================= The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. With pyparsing, you don't need to learn a new syntax for defining grammars or matching expressions - the parsing module provides a library of classes that you use to construct the grammar directly in Python. Here is a program to parse "Hello, World!" (or any greeting of the form ``"<salutation>, <addressee>!"``), built up using :class:`Word`, :class:`Literal`, and :class:`And` elements (the :meth:`'+'<ParserElement.__add__>` operators create :class:`And` expressions, and the strings are auto-converted to :class:`Literal` expressions):: from pyparsing import Word, alphas # define grammar of a greeting greet = Word(alphas) + "," + Word(alphas) + "!" hello = "Hello, World!" print(hello, "->", greet.parse_string(hello)) The program outputs the following:: Hello, World! -> ['Hello', ',', 'World', '!'] The Python representation of the grammar is quite readable, owing to the self-explanatory class names, and the use of :class:`'+'<And>`, :class:`'\|'<MatchFirst>`, :class:`'^'<Or>` and :class:`'&'<Each>` operators. The :class:`ParseResults` object returned from :class:`ParserElement.parseString` can be accessed as a nested list, a dictionary, or an object with named attributes. The pyparsing module handles some of the problems that are typically vexing when writing text parsers: - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.) - quoted strings - embedded comments Getting Started - ----------------- Visit the classes :class:`ParserElement` and :class:`ParseResults` to see the base classes that most other pyparsing classes inherit from. Use the docstrings for examples of how to: - construct literal match expressions from :class:`Literal` and :class:`CaselessLiteral` classes - construct character word-group expressions using the :class:`Word` class - see how to create repetitive expressions using :class:`ZeroOrMore` and :class:`OneOrMore` classes - use :class:`'+'<And>`, :class:`'\|'<MatchFirst>`, :class:`'^'<Or>`, and :class:`'&'<Each>` operators to combine simple expressions into more complex ones - associate names with your parsed results using :class:`ParserElement.setResultsName` - access the parsed data, which is returned as a :class:`ParseResults` object - find some helpful expression short-cuts like :class:`delimitedList` and :class:`oneOf` - find more useful common expressions in the :class:`pyparsing_common` namespace class """ from typing import NamedTuple class version_info(NamedTuple): major: int minor: int micro: int releaselevel: str serial: int @property def __version__(self): return ( "{}.{}.{}".format(self.major, self.minor, self.micro) + ( "{}{}{}".format( "r" if self.releaselevel[0] == "c" else "", self.releaselevel[0], self.serial, ), "", )[self.releaselevel == "final"] ) def __str__(self): return "{} {} / {}".format(__name__, self.__version__, __version_time__) def __repr__(self): return "{}.{}({})".format( __name__, type(self).__name__, ", ".join("{}={!r}".format(nv) for nv in zip(self._fields, self)), ) __version_info__ = version_info(3, 0, 9, "final", 0) __version_time__ = "05 May 2022 07:02 UTC" __version__ = __version_info__.__version__ __versionTime__ = __version_time__ __author__ = "Paul McGuire <ptmcg.gm+pyparsing@gmail.com>" from .util import from .exceptions import * from .actions import * from .core import __diag__, __compat__ from .results import * from .core import * from .core import _builtin_exprs as core_builtin_exprs from .helpers import * from .helpers import _builtin_exprs as helper_builtin_exprs from .unicode import unicode_set, UnicodeRangeList, pyparsing_unicode as unicode from .testing import pyparsing_test as testing from .common import ( pyparsing_common as common, _builtin_exprs as common_builtin_exprs, ) # define backward compat synonyms if "pyparsing_unicode" not in globals(): pyparsing_unicode = unicode if "pyparsing_common" not in globals(): pyparsing_common = common if "pyparsing_test" not in globals(): pyparsing_test = testing core_builtin_exprs += common_builtin_exprs + helper_builtin_exprs __all__ = [ "__version__", "__version_time__", "__author__", "__compat__", "__diag__", "And", "AtLineStart", "AtStringStart", "CaselessKeyword", "CaselessLiteral", "CharsNotIn", "Combine", "Dict", "Each", "Empty", "FollowedBy", "Forward", "GoToColumn", "Group", "IndentedBlock", "Keyword", "LineEnd", "LineStart", "Literal", "Located", "PrecededBy", "MatchFirst", "NoMatch", "NotAny", "OneOrMore", "OnlyOnce", "OpAssoc", "Opt", "Optional", "Or", "ParseBaseException", "ParseElementEnhance", "ParseException", "ParseExpression", "ParseFatalException", "ParseResults", "ParseSyntaxException", "ParserElement", "PositionToken", "QuotedString", "RecursiveGrammarException", "Regex", "SkipTo", "StringEnd", "StringStart", "Suppress", "Token", "TokenConverter", "White", "Word", "WordEnd", "WordStart", "ZeroOrMore", "Char", "alphanums", "alphas", "alphas8bit", "any_close_tag", "any_open_tag", "c_style_comment", "col", "common_html_entity", "counted_array", "cpp_style_comment", "dbl_quoted_string", "dbl_slash_comment", "delimited_list", "dict_of", "empty", "hexnums", "html_comment", "identchars", "identbodychars", "java_style_comment", "line", "line_end", "line_start", "lineno", "make_html_tags", "make_xml_tags", "match_only_at_col", "match_previous_expr", "match_previous_literal", "nested_expr", "null_debug_action", "nums", "one_of", "printables", "punc8bit", "python_style_comment", "quoted_string", "remove_quotes", "replace_with", "replace_html_entity", "rest_of_line", "sgl_quoted_string", "srange", "string_end", "string_start", "trace_parse_action", "unicode_string", "with_attribute", "indentedBlock", "original_text_for", "ungroup", "infix_notation", "locatedExpr", "with_class", "CloseMatch", "token_map", "pyparsing_common", "pyparsing_unicode", "unicode_set", "condition_as_parse_action", "pyparsing_test", # pre-PEP8 compatibility names "__versionTime__", "anyCloseTag", "anyOpenTag", "cStyleComment", "commonHTMLEntity", "countedArray", "cppStyleComment", "dblQuotedString", "dblSlashComment", "delimitedList", "dictOf", "htmlComment", "javaStyleComment", "lineEnd", "lineStart", "makeHTMLTags", "makeXMLTags", "matchOnlyAtCol", "matchPreviousExpr", "matchPreviousLiteral", "nestedExpr", "nullDebugAction", "oneOf", "opAssoc", "pythonStyleComment", "quotedString", "removeQuotes", "replaceHTMLEntity", "replaceWith", "restOfLine", "sglQuotedString", "stringEnd", "stringStart", "traceParseAction", "unicodeString", "withAttribute", "indentedBlock", "originalTextFor", "infixNotation", "locatedExpr", "withClass", "tokenMap", "conditionAsParseAction", "autoname_elements", ]	8.94 KB	2026-01-20 12:58
📁 __pycache__	-	2026-03-21 15:45
📄 actions.py # actions.py from .exceptions import ParseException from .util import col class OnlyOnce: """ Wrapper for parse actions, to ensure they are only called once. """ def __init__(self, method_call): from .core import _trim_arity self.callable = _trim_arity(method_call) self.called = False def __call__(self, s, l, t): if not self.called: results = self.callable(s, l, t) self.called = True return results raise ParseException(s, l, "OnlyOnce obj called multiple times w/out reset") def reset(self): """ Allow the associated parse action to be called once more. """ self.called = False def match_only_at_col(n): """ Helper method for defining parse actions that require matching at a specific column in the input text. """ def verify_col(strg, locn, toks): if col(locn, strg) != n: raise ParseException(strg, locn, "matched token not at column {}".format(n)) return verify_col def replace_with(repl_str): """ Helper method for common parse actions that simply return a literal value. Especially useful when used with :class:`transform_string<ParserElement.transform_string>` (). Example:: num = Word(nums).set_parse_action(lambda toks: int(toks[0])) na = one_of("N/A NA").set_parse_action(replace_with(math.nan)) term = na \| num term[1, ...].parse_string("324 234 N/A 234") # -> [324, 234, nan, 234] """ return lambda s, l, t: [repl_str] def remove_quotes(s, l, t): """ Helper parse action for removing quotation marks from parsed quoted strings. Example:: # by default, quotation marks are included in parsed results quoted_string.parse_string("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"] # use remove_quotes to strip quotation marks from parsed results quoted_string.set_parse_action(remove_quotes) quoted_string.parse_string("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"] """ return t[0][1:-1] def with_attribute(args, attr_dict): """ Helper to create a validating parse action to be used with start tags created with :class:`make_xml_tags` or :class:`make_html_tags`. Use ``with_attribute`` to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as ``<TD>`` or ``<DIV>``. Call ``with_attribute`` with a series of attribute names and values. Specify the list of filter attributes names and values as: - keyword arguments, as in ``(align="right")``, or - as an explicit dict with ```` operator, when an attribute name is also a Python reserved word, as in ``{"class":"Customer", "align":"right"}`` - a list of name-value tuples, as in ``(("ns1:class", "Customer"), ("ns2:align", "right"))`` For attribute names with a namespace prefix, you must use the second form. Attribute names are matched insensitive to upper/lower case. If just testing for ``class`` (with or without a namespace), use :class:`with_class`. To verify that the attribute exists, but without specifying a value, pass ``with_attribute.ANY_VALUE`` as the value. Example:: html = ''' <div> Some text <div type="grid">1 4 0 1 0</div> <div type="graph">1,3 2,3 1,1</div> <div>this has no type</div> </div> ''' div,div_end = make_html_tags("div") # only match div tag having a type attribute with value "grid" div_grid = div().set_parse_action(with_attribute(type="grid")) grid_expr = div_grid + SkipTo(div \| div_end)("body") for grid_header in grid_expr.search_string(html): print(grid_header.body) # construct a match with any div tag having a type attribute, regardless of the value div_any_type = div().set_parse_action(with_attribute(type=with_attribute.ANY_VALUE)) div_expr = div_any_type + SkipTo(div \| div_end)("body") for div_header in div_expr.search_string(html): print(div_header.body) prints:: 1 4 0 1 0 1 4 0 1 0 1,3 2,3 1,1 """ if args: attrs = args[:] else: attrs = attr_dict.items() attrs = [(k, v) for k, v in attrs] def pa(s, l, tokens): for attrName, attrValue in attrs: if attrName not in tokens: raise ParseException(s, l, "no matching attribute " + attrName) if attrValue != with_attribute.ANY_VALUE and tokens[attrName] != attrValue: raise ParseException( s, l, "attribute {!r} has value {!r}, must be {!r}".format( attrName, tokens[attrName], attrValue ), ) return pa with_attribute.ANY_VALUE = object() def with_class(classname, namespace=""): """ Simplified version of :class:`with_attribute` when matching on a div class - made difficult because ``class`` is a reserved word in Python. Example:: html = ''' <div> Some text <div class="grid">1 4 0 1 0</div> <div class="graph">1,3 2,3 1,1</div> <div>this <div> has no class</div> </div> ''' div,div_end = make_html_tags("div") div_grid = div().set_parse_action(with_class("grid")) grid_expr = div_grid + SkipTo(div \| div_end)("body") for grid_header in grid_expr.search_string(html): print(grid_header.body) div_any_type = div().set_parse_action(with_class(withAttribute.ANY_VALUE)) div_expr = div_any_type + SkipTo(div \| div_end)("body") for div_header in div_expr.search_string(html): print(div_header.body) prints:: 1 4 0 1 0 1 4 0 1 0 1,3 2,3 1,1 """ classattr = "{}:class".format(namespace) if namespace else "class" return with_attribute(*{classattr: classname}) # pre-PEP8 compatibility symbols replaceWith = replace_with removeQuotes = remove_quotes withAttribute = with_attribute withClass = with_class matchOnlyAtCol = match_only_at_col	6.28 KB	2026-01-20 12:58
📄 common.py # common.py from .core import * from .helpers import delimited_list, any_open_tag, any_close_tag from datetime import datetime # some other useful expressions - using lower-case class name since we are really using this as a namespace class pyparsing_common: """Here are some common low-level expressions that may be useful in jump-starting parser development: - numeric forms (:class:`integers<integer>`, :class:`reals<real>`, :class:`scientific notation<sci_real>`) - common :class:`programming identifiers<identifier>` - network addresses (:class:`MAC<mac_address>`, :class:`IPv4<ipv4_address>`, :class:`IPv6<ipv6_address>`) - ISO8601 :class:`dates<iso8601_date>` and :class:`datetime<iso8601_datetime>` - :class:`UUID<uuid>` - :class:`comma-separated list<comma_separated_list>` - :class:`url` Parse actions: - :class:`convertToInteger` - :class:`convertToFloat` - :class:`convertToDate` - :class:`convertToDatetime` - :class:`stripHTMLTags` - :class:`upcaseTokens` - :class:`downcaseTokens` Example:: pyparsing_common.number.runTests(''' # any int or real number, returned as the appropriate type 100 -100 +100 3.14159 6.02e23 1e-12 ''') pyparsing_common.fnumber.runTests(''' # any int or real number, returned as float 100 -100 +100 3.14159 6.02e23 1e-12 ''') pyparsing_common.hex_integer.runTests(''' # hex numbers 100 FF ''') pyparsing_common.fraction.runTests(''' # fractions 1/2 -3/4 ''') pyparsing_common.mixed_integer.runTests(''' # mixed fractions 1 1/2 -3/4 1-3/4 ''') import uuid pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) pyparsing_common.uuid.runTests(''' # uuid 12345678-1234-5678-1234-567812345678 ''') prints:: # any int or real number, returned as the appropriate type 100 [100] -100 [-100] +100 [100] 3.14159 [3.14159] 6.02e23 [6.02e+23] 1e-12 [1e-12] # any int or real number, returned as float 100 [100.0] -100 [-100.0] +100 [100.0] 3.14159 [3.14159] 6.02e23 [6.02e+23] 1e-12 [1e-12] # hex numbers 100 [256] FF [255] # fractions 1/2 [0.5] -3/4 [-0.75] # mixed fractions 1 [1] 1/2 [0.5] -3/4 [-0.75] 1-3/4 [1.75] # uuid 12345678-1234-5678-1234-567812345678 [UUID('12345678-1234-5678-1234-567812345678')] """ convert_to_integer = token_map(int) """ Parse action for converting parsed integers to Python int """ convert_to_float = token_map(float) """ Parse action for converting parsed numbers to Python float """ integer = Word(nums).set_name("integer").set_parse_action(convert_to_integer) """expression that parses an unsigned integer, returns an int""" hex_integer = ( Word(hexnums).set_name("hex integer").set_parse_action(token_map(int, 16)) ) """expression that parses a hexadecimal integer, returns an int""" signed_integer = ( Regex(r"[+-]?\d+") .set_name("signed integer") .set_parse_action(convert_to_integer) ) """expression that parses an integer with optional leading sign, returns an int""" fraction = ( signed_integer().set_parse_action(convert_to_float) + "/" + signed_integer().set_parse_action(convert_to_float) ).set_name("fraction") """fractional expression of an integer divided by an integer, returns a float""" fraction.add_parse_action(lambda tt: tt[0] / tt[-1]) mixed_integer = ( fraction \| signed_integer + Opt(Opt("-").suppress() + fraction) ).set_name("fraction or mixed integer-fraction") """mixed integer of the form 'integer - fraction', with optional leading integer, returns float""" mixed_integer.add_parse_action(sum) real = ( Regex(r"[+-]?(?:\d+\.\d\|\.\d+)") .set_name("real number") .set_parse_action(convert_to_float) ) """expression that parses a floating point number and returns a float""" sci_real = ( Regex(r"[+-]?(?:\d+(?:[eE][+-]?\d+)\|(?:\d+\.\d\|\.\d+)(?:[eE][+-]?\d+)?)") .set_name("real number with scientific notation") .set_parse_action(convert_to_float) ) """expression that parses a floating point number with optional scientific notation and returns a float""" # streamlining this expression makes the docs nicer-looking number = (sci_real \| real \| signed_integer).setName("number").streamline() """any numeric expression, returns the corresponding Python type""" fnumber = ( Regex(r"[+-]?\d+\.?\d([eE][+-]?\d+)?") .set_name("fnumber") .set_parse_action(convert_to_float) ) """any int or real number, returned as float""" identifier = Word(identchars, identbodychars).set_name("identifier") """typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')""" ipv4_address = Regex( r"(25[0-5]\|2[0-4][0-9]\|1?[0-9]{1,2})(\.(25[0-5]\|2[0-4][0-9]\|1?[0-9]{1,2})){3}" ).set_name("IPv4 address") "IPv4 address (``0.0.0.0 - 255.255.255.255``)" _ipv6_part = Regex(r"[0-9a-fA-F]{1,4}").set_name("hex_integer") _full_ipv6_address = (_ipv6_part + (":" + _ipv6_part) 7).set_name( "full IPv6 address" ) _short_ipv6_address = ( Opt(_ipv6_part + (":" + _ipv6_part) * (0, 6)) + "::" + Opt(_ipv6_part + (":" + _ipv6_part) * (0, 6)) ).set_name("short IPv6 address") _short_ipv6_address.add_condition( lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8 ) _mixed_ipv6_address = ("::ffff:" + ipv4_address).set_name("mixed IPv6 address") ipv6_address = Combine( (_full_ipv6_address \| _mixed_ipv6_address \| _short_ipv6_address).set_name( "IPv6 address" ) ).set_name("IPv6 address") "IPv6 address (long, short, or mixed form)" mac_address = Regex( r"[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}" ).set_name("MAC address") "MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)" @staticmethod def convert_to_date(fmt: str = "%Y-%m-%d"): """ Helper to create a parse action for converting parsed date string to Python datetime.date Params - - fmt - format to be passed to datetime.strptime (default= ``"%Y-%m-%d"``) Example:: date_expr = pyparsing_common.iso8601_date.copy() date_expr.setParseAction(pyparsing_common.convertToDate()) print(date_expr.parseString("1999-12-31")) prints:: [datetime.date(1999, 12, 31)] """ def cvt_fn(ss, ll, tt): try: return datetime.strptime(tt[0], fmt).date() except ValueError as ve: raise ParseException(ss, ll, str(ve)) return cvt_fn @staticmethod def convert_to_datetime(fmt: str = "%Y-%m-%dT%H:%M:%S.%f"): """Helper to create a parse action for converting parsed datetime string to Python datetime.datetime Params - - fmt - format to be passed to datetime.strptime (default= ``"%Y-%m-%dT%H:%M:%S.%f"``) Example:: dt_expr = pyparsing_common.iso8601_datetime.copy() dt_expr.setParseAction(pyparsing_common.convertToDatetime()) print(dt_expr.parseString("1999-12-31T23:59:59.999")) prints:: [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)] """ def cvt_fn(s, l, t): try: return datetime.strptime(t[0], fmt) except ValueError as ve: raise ParseException(s, l, str(ve)) return cvt_fn iso8601_date = Regex( r"(?P<year>\d{4})(?:-(?P<month>\d\d)(?:-(?P<day>\d\d))?)?" ).set_name("ISO8601 date") "ISO8601 date (``yyyy-mm-dd``)" iso8601_datetime = Regex( r"(?P<year>\d{4})-(?P<month>\d\d)-(?P<day>\d\d)[T ](?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d(\.\d)?)?)?(?P<tz>Z\|[+-]\d\d:?\d\d)?" ).set_name("ISO8601 datetime") "ISO8601 datetime (``yyyy-mm-ddThh:mm:ss.s(Z\|+-00:00)``) - trailing seconds, milliseconds, and timezone optional; accepts separating ``'T'`` or ``' '``" uuid = Regex(r"[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}").set_name("UUID") "UUID (``xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx``)" _html_stripper = any_open_tag.suppress() \| any_close_tag.suppress() @staticmethod def strip_html_tags(s: str, l: int, tokens: ParseResults): """Parse action to remove HTML tags from web page HTML source Example:: # strip HTML links from normal text text = '<td>More info at the <a href="https://github.com/pyparsing/pyparsing/wiki">pyparsing</a> wiki page</td>' td, td_end = makeHTMLTags("TD") table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end print(table_text.parseString(text).body) Prints:: More info at the pyparsing wiki page """ return pyparsing_common._html_stripper.transform_string(tokens[0]) _commasepitem = ( Combine( OneOrMore( ~Literal(",") + ~LineEnd() + Word(printables, exclude_chars=",") + Opt(White(" \t") + ~FollowedBy(LineEnd() \| ",")) ) ) .streamline() .set_name("commaItem") ) comma_separated_list = delimited_list( Opt(quoted_string.copy() \| _commasepitem, default="") ).set_name("comma separated list") """Predefined expression of 1 or more printable words or quoted strings, separated by commas.""" upcase_tokens = staticmethod(token_map(lambda t: t.upper())) """Parse action to convert tokens to upper case.""" downcase_tokens = staticmethod(token_map(lambda t: t.lower())) """Parse action to convert tokens to lower case.""" # fmt: off url = Regex( # https://mathiasbynens.be/demo/url-regex # https://gist.github.com/dperini/729294 r"^" + # protocol identifier (optional) # short syntax // still required r"(?:(?:(?P<scheme>https?\|ftp):)?\/\/)" + # user:pass BasicAuth (optional) r"(?:(?P<auth>\S+(?::\S)?)@)?" + r"(?P<host>" + # IP address exclusion # private & local networks r"(?!(?:10\|127)(?:\.\d{1,3}){3})" + r"(?!(?:169\.254\|192\.168)(?:\.\d{1,3}){2})" + r"(?!172\.(?:1[6-9]\|2\d\|3[0-1])(?:\.\d{1,3}){2})" + # IP address dotted notation octets # excludes loopback network 0.0.0.0 # excludes reserved space >= 224.0.0.0 # excludes network & broadcast addresses # (first & last IP address of each class) r"(?:[1-9]\d?\|1\d\d\|2[01]\d\|22[0-3])" + r"(?:\.(?:1?\d{1,2}\|2[0-4]\d\|25[0-5])){2}" + r"(?:\.(?:[1-9]\d?\|1\d\d\|2[0-4]\d\|25[0-4]))" + r"\|" + # host & domain names, may end with dot # can be replaced by a shortest alternative # (?![-_])(?:[-\w\u00a1-\uffff]{0,63}[^-_]\.)+ r"(?:" + r"(?:" + r"[a-z0-9\u00a1-\uffff]" + r"[a-z0-9\u00a1-\uffff_-]{0,62}" + r")?" + r"[a-z0-9\u00a1-\uffff]\." + r")+" + # TLD identifier name, may end with dot r"(?:[a-z\u00a1-\uffff]{2,}\.?)" + r")" + # port number (optional) r"(:(?P<port>\d{2,5}))?" + # resource path (optional) r"(?P<path>\/[^?# ])?" + # query string (optional) r"(\?(?P<query>[^#]))?" + # fragment (optional) r"(#(?P<fragment>\S*))?" + r"$" ).set_name("url") # fmt: on # pre-PEP8 compatibility names convertToInteger = convert_to_integer convertToFloat = convert_to_float convertToDate = convert_to_date convertToDatetime = convert_to_datetime stripHTMLTags = strip_html_tags upcaseTokens = upcase_tokens downcaseTokens = downcase_tokens _builtin_exprs = [ v for v in vars(pyparsing_common).values() if isinstance(v, ParserElement) ]	12.63 KB	2026-01-20 12:58
📄 core.py # # core.py # import os import typing from typing import ( NamedTuple, Union, Callable, Any, Generator, Tuple, List, TextIO, Set, Sequence, ) from abc import ABC, abstractmethod from enum import Enum import string import copy import warnings import re import sys from collections.abc import Iterable import traceback import types from operator import itemgetter from functools import wraps from threading import RLock from pathlib import Path from .util import ( _FifoCache, _UnboundedCache, __config_flags, _collapse_string_to_ranges, _escape_regex_range_chars, _bslash, _flatten, LRUMemo as _LRUMemo, UnboundedMemo as _UnboundedMemo, ) from .exceptions import * from .actions import * from .results import ParseResults, _ParseResultsWithOffset from .unicode import pyparsing_unicode _MAX_INT = sys.maxsize str_type: Tuple[type, ...] = (str, bytes) # # Copyright (c) 2003-2022 Paul T. McGuire # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, # distribute, sublicense, and/or sell copies of the Software, and to # permit persons to whom the Software is furnished to do so, subject to # the following conditions: # # The above copyright notice and this permission notice shall be # included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # if sys.version_info >= (3, 8): from functools import cached_property else: class cached_property: def __init__(self, func): self._func = func def __get__(self, instance, owner=None): ret = instance.__dict__[self._func.__name__] = self._func(instance) return ret class __compat__(__config_flags): """ A cross-version compatibility configuration for pyparsing features that will be released in a future version. By setting values in this configuration to True, those features can be enabled in prior versions for compatibility development and testing. - ``collect_all_And_tokens`` - flag to enable fix for Issue #63 that fixes erroneous grouping of results names when an :class:`And` expression is nested within an :class:`Or` or :class:`MatchFirst`; maintained for compatibility, but setting to ``False`` no longer restores pre-2.3.1 behavior """ _type_desc = "compatibility" collect_all_And_tokens = True _all_names = [__ for __ in locals() if not __.startswith("_")] _fixed_names = """ collect_all_And_tokens """.split() class __diag__(__config_flags): _type_desc = "diagnostic" warn_multiple_tokens_in_named_alternation = False warn_ungrouped_named_tokens_in_collection = False warn_name_set_on_empty_Forward = False warn_on_parse_using_empty_Forward = False warn_on_assignment_to_Forward = False warn_on_multiple_string_args_to_oneof = False warn_on_match_first_with_lshift_operator = False enable_debug_on_named_expressions = False _all_names = [__ for __ in locals() if not __.startswith("_")] _warning_names = [name for name in _all_names if name.startswith("warn")] _debug_names = [name for name in _all_names if name.startswith("enable_debug")] @classmethod def enable_all_warnings(cls) -> None: for name in cls._warning_names: cls.enable(name) class Diagnostics(Enum): """ Diagnostic configuration (all default to disabled) - ``warn_multiple_tokens_in_named_alternation`` - flag to enable warnings when a results name is defined on a :class:`MatchFirst` or :class:`Or` expression with one or more :class:`And` subexpressions - ``warn_ungrouped_named_tokens_in_collection`` - flag to enable warnings when a results name is defined on a containing expression with ungrouped subexpressions that also have results names - ``warn_name_set_on_empty_Forward`` - flag to enable warnings when a :class:`Forward` is defined with a results name, but has no contents defined - ``warn_on_parse_using_empty_Forward`` - flag to enable warnings when a :class:`Forward` is defined in a grammar but has never had an expression attached to it - ``warn_on_assignment_to_Forward`` - flag to enable warnings when a :class:`Forward` is defined but is overwritten by assigning using ``'='`` instead of ``'<<='`` or ``'<<'`` - ``warn_on_multiple_string_args_to_oneof`` - flag to enable warnings when :class:`one_of` is incorrectly called with multiple str arguments - ``enable_debug_on_named_expressions`` - flag to auto-enable debug on all subsequent calls to :class:`ParserElement.set_name` Diagnostics are enabled/disabled by calling :class:`enable_diag` and :class:`disable_diag`. All warnings can be enabled by calling :class:`enable_all_warnings`. """ warn_multiple_tokens_in_named_alternation = 0 warn_ungrouped_named_tokens_in_collection = 1 warn_name_set_on_empty_Forward = 2 warn_on_parse_using_empty_Forward = 3 warn_on_assignment_to_Forward = 4 warn_on_multiple_string_args_to_oneof = 5 warn_on_match_first_with_lshift_operator = 6 enable_debug_on_named_expressions = 7 def enable_diag(diag_enum: Diagnostics) -> None: """ Enable a global pyparsing diagnostic flag (see :class:`Diagnostics`). """ __diag__.enable(diag_enum.name) def disable_diag(diag_enum: Diagnostics) -> None: """ Disable a global pyparsing diagnostic flag (see :class:`Diagnostics`). """ __diag__.disable(diag_enum.name) def enable_all_warnings() -> None: """ Enable all global pyparsing diagnostic warnings (see :class:`Diagnostics`). """ __diag__.enable_all_warnings() # hide abstract class del __config_flags def _should_enable_warnings( cmd_line_warn_options: typing.Iterable[str], warn_env_var: typing.Optional[str] ) -> bool: enable = bool(warn_env_var) for warn_opt in cmd_line_warn_options: w_action, w_message, w_category, w_module, w_line = (warn_opt + "::::").split( ":" )[:5] if not w_action.lower().startswith("i") and ( not (w_message or w_category or w_module) or w_module == "pyparsing" ): enable = True elif w_action.lower().startswith("i") and w_module in ("pyparsing", ""): enable = False return enable if _should_enable_warnings( sys.warnoptions, os.environ.get("PYPARSINGENABLEALLWARNINGS") ): enable_all_warnings() # build list of single arg builtins, that can be used as parse actions _single_arg_builtins = { sum, len, sorted, reversed, list, tuple, set, any, all, min, max, } _generatorType = types.GeneratorType ParseAction = Union[ Callable[[], Any], Callable[[ParseResults], Any], Callable[[int, ParseResults], Any], Callable[[str, int, ParseResults], Any], ] ParseCondition = Union[ Callable[[], bool], Callable[[ParseResults], bool], Callable[[int, ParseResults], bool], Callable[[str, int, ParseResults], bool], ] ParseFailAction = Callable[[str, int, "ParserElement", Exception], None] DebugStartAction = Callable[[str, int, "ParserElement", bool], None] DebugSuccessAction = Callable[ [str, int, int, "ParserElement", ParseResults, bool], None ] DebugExceptionAction = Callable[[str, int, "ParserElement", Exception, bool], None] alphas = string.ascii_uppercase + string.ascii_lowercase identchars = pyparsing_unicode.Latin1.identchars identbodychars = pyparsing_unicode.Latin1.identbodychars nums = "0123456789" hexnums = nums + "ABCDEFabcdef" alphanums = alphas + nums printables = "".join([c for c in string.printable if c not in string.whitespace]) _trim_arity_call_line: traceback.StackSummary = None def _trim_arity(func, max_limit=3): """decorator to trim function calls to match the arity of the target""" global _trim_arity_call_line if func in _single_arg_builtins: return lambda s, l, t: func(t) limit = 0 found_arity = False def extract_tb(tb, limit=0): frames = traceback.extract_tb(tb, limit=limit) frame_summary = frames[-1] return [frame_summary[:2]] # synthesize what would be returned by traceback.extract_stack at the call to # user's parse action 'func', so that we don't incur call penalty at parse time # fmt: off LINE_DIFF = 7 # IF ANY CODE CHANGES, EVEN JUST COMMENTS OR BLANK LINES, BETWEEN THE NEXT LINE AND # THE CALL TO FUNC INSIDE WRAPPER, LINE_DIFF MUST BE MODIFIED!!!! _trim_arity_call_line = (_trim_arity_call_line or traceback.extract_stack(limit=2)[-1]) pa_call_line_synth = (_trim_arity_call_line[0], _trim_arity_call_line[1] + LINE_DIFF) def wrapper(args): nonlocal found_arity, limit while 1: try: ret = func(args[limit:]) found_arity = True return ret except TypeError as te: # re-raise TypeErrors if they did not come from our arity testing if found_arity: raise else: tb = te.__traceback__ trim_arity_type_error = ( extract_tb(tb, limit=2)[-1][:2] == pa_call_line_synth ) del tb if trim_arity_type_error: if limit < max_limit: limit += 1 continue raise # fmt: on # copy func name to wrapper for sensible debug output # (can't use functools.wraps, since that messes with function signature) func_name = getattr(func, "__name__", getattr(func, "__class__").__name__) wrapper.__name__ = func_name wrapper.__doc__ = func.__doc__ return wrapper def condition_as_parse_action( fn: ParseCondition, message: str = None, fatal: bool = False ) -> ParseAction: """ Function to convert a simple predicate function that returns ``True`` or ``False`` into a parse action. Can be used in places when a parse action is required and :class:`ParserElement.add_condition` cannot be used (such as when adding a condition to an operator level in :class:`infix_notation`). Optional keyword arguments: - ``message`` - define a custom message to be used in the raised exception - ``fatal`` - if True, will raise :class:`ParseFatalException` to stop parsing immediately; otherwise will raise :class:`ParseException` """ msg = message if message is not None else "failed user-defined condition" exc_type = ParseFatalException if fatal else ParseException fn = _trim_arity(fn) @wraps(fn) def pa(s, l, t): if not bool(fn(s, l, t)): raise exc_type(s, l, msg) return pa def _default_start_debug_action( instring: str, loc: int, expr: "ParserElement", cache_hit: bool = False ): cache_hit_str = "" if cache_hit else "" print( ( "{}Match {} at loc {}({},{})\n {}\n {}^".format( cache_hit_str, expr, loc, lineno(loc, instring), col(loc, instring), line(loc, instring), " " (col(loc, instring) - 1), ) ) ) def _default_success_debug_action( instring: str, startloc: int, endloc: int, expr: "ParserElement", toks: ParseResults, cache_hit: bool = False, ): cache_hit_str = "" if cache_hit else "" print("{}Matched {} -> {}".format(cache_hit_str, expr, toks.as_list())) def _default_exception_debug_action( instring: str, loc: int, expr: "ParserElement", exc: Exception, cache_hit: bool = False, ): cache_hit_str = "" if cache_hit else "" print( "{}Match {} failed, {} raised: {}".format( cache_hit_str, expr, type(exc).__name__, exc ) ) def null_debug_action(args): """'Do-nothing' debug action, to suppress debugging output during parsing.""" class ParserElement(ABC): """Abstract base level parser element class.""" DEFAULT_WHITE_CHARS: str = " \n\t\r" verbose_stacktrace: bool = False _literalStringClass: typing.Optional[type] = None @staticmethod def set_default_whitespace_chars(chars: str) -> None: r""" Overrides the default whitespace chars Example:: # default whitespace chars are space, <TAB> and newline Word(alphas)[1, ...].parse_string("abc def\nghi jkl") # -> ['abc', 'def', 'ghi', 'jkl'] # change to just treat newline as significant ParserElement.set_default_whitespace_chars(" \t") Word(alphas)[1, ...].parse_string("abc def\nghi jkl") # -> ['abc', 'def'] """ ParserElement.DEFAULT_WHITE_CHARS = chars # update whitespace all parse expressions defined in this module for expr in _builtin_exprs: if expr.copyDefaultWhiteChars: expr.whiteChars = set(chars) @staticmethod def inline_literals_using(cls: type) -> None: """ Set class to be used for inclusion of string literals into a parser. Example:: # default literal class used is Literal integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") date_str.parse_string("1999/12/31") # -> ['1999', '/', '12', '/', '31'] # change to Suppress ParserElement.inline_literals_using(Suppress) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") date_str.parse_string("1999/12/31") # -> ['1999', '12', '31'] """ ParserElement._literalStringClass = cls class DebugActions(NamedTuple): debug_try: typing.Optional[DebugStartAction] debug_match: typing.Optional[DebugSuccessAction] debug_fail: typing.Optional[DebugExceptionAction] def __init__(self, savelist: bool = False): self.parseAction: List[ParseAction] = list() self.failAction: typing.Optional[ParseFailAction] = None self.customName = None self._defaultName = None self.resultsName = None self.saveAsList = savelist self.skipWhitespace = True self.whiteChars = set(ParserElement.DEFAULT_WHITE_CHARS) self.copyDefaultWhiteChars = True # used when checking for left-recursion self.mayReturnEmpty = False self.keepTabs = False self.ignoreExprs: List["ParserElement"] = list() self.debug = False self.streamlined = False # optimize exception handling for subclasses that don't advance parse index self.mayIndexError = True self.errmsg = "" # mark results names as modal (report only last) or cumulative (list all) self.modalResults = True # custom debug actions self.debugActions = self.DebugActions(None, None, None) # avoid redundant calls to preParse self.callPreparse = True self.callDuringTry = False self.suppress_warnings_: List[Diagnostics] = [] def suppress_warning(self, warning_type: Diagnostics) -> "ParserElement": """ Suppress warnings emitted for a particular diagnostic on this expression. Example:: base = pp.Forward() base.suppress_warning(Diagnostics.warn_on_parse_using_empty_Forward) # statement would normally raise a warning, but is now suppressed print(base.parseString("x")) """ self.suppress_warnings_.append(warning_type) return self def copy(self) -> "ParserElement": """ Make a copy of this :class:`ParserElement`. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element. Example:: integer = Word(nums).set_parse_action(lambda toks: int(toks[0])) integerK = integer.copy().add_parse_action(lambda toks: toks[0] 1024) + Suppress("K") integerM = integer.copy().add_parse_action(lambda toks: toks[0] * 1024 * 1024) + Suppress("M") print((integerK \| integerM \| integer)[1, ...].parse_string("5K 100 640K 256M")) prints:: [5120, 100, 655360, 268435456] Equivalent form of ``expr.copy()`` is just ``expr()``:: integerM = integer().add_parse_action(lambda toks: toks[0] * 1024 * 1024) + Suppress("M") """ cpy = copy.copy(self) cpy.parseAction = self.parseAction[:] cpy.ignoreExprs = self.ignoreExprs[:] if self.copyDefaultWhiteChars: cpy.whiteChars = set(ParserElement.DEFAULT_WHITE_CHARS) return cpy def set_results_name( self, name: str, list_all_matches: bool = False, , listAllMatches: bool = False ) -> "ParserElement": """ Define name for referencing matching tokens as a nested attribute of the returned parse results. Normally, results names are assigned as you would assign keys in a dict: any existing value is overwritten by later values. If it is necessary to keep all values captured for a particular results name, call ``set_results_name`` with ``list_all_matches`` = True. NOTE: ``set_results_name`` returns a copy* of the original :class:`ParserElement` object; this is so that the client can define a basic element, such as an integer, and reference it in multiple places with different names. You can also set results names using the abbreviated syntax, ``expr("name")`` in place of ``expr.set_results_name("name")`` - see :class:`__call__`. If ``list_all_matches`` is required, use ``expr("name")``. Example:: date_str = (integer.set_results_name("year") + '/' + integer.set_results_name("month") + '/' + integer.set_results_name("day")) # equivalent form: date_str = integer("year") + '/' + integer("month") + '/' + integer("day") """ listAllMatches = listAllMatches or list_all_matches return self._setResultsName(name, listAllMatches) def _setResultsName(self, name, listAllMatches=False): if name is None: return self newself = self.copy() if name.endswith(""): name = name[:-1] listAllMatches = True newself.resultsName = name newself.modalResults = not listAllMatches return newself def set_break(self, break_flag: bool = True) -> "ParserElement": """ Method to invoke the Python pdb debugger when this element is about to be parsed. Set ``break_flag`` to ``True`` to enable, ``False`` to disable. """ if break_flag: _parseMethod = self._parse def breaker(instring, loc, doActions=True, callPreParse=True): import pdb # this call to pdb.set_trace() is intentional, not a checkin error pdb.set_trace() return _parseMethod(instring, loc, doActions, callPreParse) breaker._originalParseMethod = _parseMethod self._parse = breaker else: if hasattr(self._parse, "_originalParseMethod"): self._parse = self._parse._originalParseMethod return self def set_parse_action(self, fns: ParseAction, kwargs) -> "ParserElement": """ Define one or more actions to perform when successfully matching parse element definition. Parse actions can be called to perform data conversions, do extra validation, update external data structures, or enhance or replace the parsed tokens. Each parse action ``fn`` is a callable method with 0-3 arguments, called as ``fn(s, loc, toks)`` , ``fn(loc, toks)`` , ``fn(toks)`` , or just ``fn()`` , where: - s = the original string being parsed (see note below) - loc = the location of the matching substring - toks = a list of the matched tokens, packaged as a :class:`ParseResults` object The parsed tokens are passed to the parse action as ParseResults. They can be modified in place using list-style append, extend, and pop operations to update the parsed list elements; and with dictionary-style item set and del operations to add, update, or remove any named results. If the tokens are modified in place, it is not necessary to return them with a return statement. Parse actions can also completely replace the given tokens, with another ``ParseResults`` object, or with some entirely different object (common for parse actions that perform data conversions). A convenient way to build a new parse result is to define the values using a dict, and then create the return value using :class:`ParseResults.from_dict`. If None is passed as the ``fn`` parse action, all previously added parse actions for this expression are cleared. Optional keyword arguments: - call_during_try = (default= ``False``) indicate if parse action should be run during lookaheads and alternate testing. For parse actions that have side effects, it is important to only call the parse action once it is determined that it is being called as part of a successful parse. For parse actions that perform additional validation, then call_during_try should be passed as True, so that the validation code is included in the preliminary "try" parses. Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See :class:`parse_string` for more information on parsing strings containing ``<TAB>`` s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. Example:: # parse dates in the form YYYY/MM/DD # use parse action to convert toks from str to int at parse time def convert_to_int(toks): return int(toks[0]) # use a parse action to verify that the date is a valid date def is_valid_date(instring, loc, toks): from datetime import date year, month, day = toks[::2] try: date(year, month, day) except ValueError: raise ParseException(instring, loc, "invalid date given") integer = Word(nums) date_str = integer + '/' + integer + '/' + integer # add parse actions integer.set_parse_action(convert_to_int) date_str.set_parse_action(is_valid_date) # note that integer fields are now ints, not strings date_str.run_tests(''' # successful parse - note that integer fields were converted to ints 1999/12/31 # fail - invalid date 1999/13/31 ''') """ if list(fns) == [None]: self.parseAction = [] else: if not all(callable(fn) for fn in fns): raise TypeError("parse actions must be callable") self.parseAction = [_trim_arity(fn) for fn in fns] self.callDuringTry = kwargs.get( "call_during_try", kwargs.get("callDuringTry", False) ) return self def add_parse_action(self, fns: ParseAction, *kwargs) -> "ParserElement": """ Add one or more parse actions to expression's list of parse actions. See :class:`set_parse_action`. See examples in :class:`copy`. """ self.parseAction += [_trim_arity(fn) for fn in fns] self.callDuringTry = self.callDuringTry or kwargs.get( "call_during_try", kwargs.get("callDuringTry", False) ) return self def add_condition(self, fns: ParseCondition, *kwargs) -> "ParserElement": """Add a boolean predicate function to expression's list of parse actions. See :class:`set_parse_action` for function call signatures. Unlike ``set_parse_action``, functions passed to ``add_condition`` need to return boolean success/fail of the condition. Optional keyword arguments: - message = define a custom message to be used in the raised exception - fatal = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException - call_during_try = boolean to indicate if this method should be called during internal tryParse calls, default=False Example:: integer = Word(nums).set_parse_action(lambda toks: int(toks[0])) year_int = integer.copy() year_int.add_condition(lambda toks: toks[0] >= 2000, message="Only support years 2000 and later") date_str = year_int + '/' + integer + '/' + integer result = date_str.parse_string("1999/12/31") # -> Exception: Only support years 2000 and later (at char 0), (line:1, col:1) """ for fn in fns: self.parseAction.append( condition_as_parse_action( fn, message=kwargs.get("message"), fatal=kwargs.get("fatal", False) ) ) self.callDuringTry = self.callDuringTry or kwargs.get( "call_during_try", kwargs.get("callDuringTry", False) ) return self def set_fail_action(self, fn: ParseFailAction) -> "ParserElement": """ Define action to perform if parsing fails at this expression. Fail acton fn is a callable function that takes the arguments ``fn(s, loc, expr, err)`` where: - s = string being parsed - loc = location where expression match was attempted and failed - expr = the parse expression that failed - err = the exception thrown The function returns no value. It may throw :class:`ParseFatalException` if it is desired to stop parsing immediately.""" self.failAction = fn return self def _skipIgnorables(self, instring, loc): exprsFound = True while exprsFound: exprsFound = False for e in self.ignoreExprs: try: while 1: loc, dummy = e._parse(instring, loc) exprsFound = True except ParseException: pass return loc def preParse(self, instring, loc): if self.ignoreExprs: loc = self._skipIgnorables(instring, loc) if self.skipWhitespace: instrlen = len(instring) white_chars = self.whiteChars while loc < instrlen and instring[loc] in white_chars: loc += 1 return loc def parseImpl(self, instring, loc, doActions=True): return loc, [] def postParse(self, instring, loc, tokenlist): return tokenlist # @profile def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ) -> Tuple[int, ParseResults]: TRY, MATCH, FAIL = 0, 1, 2 debugging = self.debug # and doActions) len_instring = len(instring) if debugging or self.failAction: # print("Match {} at loc {}({}, {})".format(self, loc, lineno(loc, instring), col(loc, instring))) try: if callPreParse and self.callPreparse: pre_loc = self.preParse(instring, loc) else: pre_loc = loc tokens_start = pre_loc if self.debugActions.debug_try: self.debugActions.debug_try(instring, tokens_start, self, False) if self.mayIndexError or pre_loc >= len_instring: try: loc, tokens = self.parseImpl(instring, pre_loc, doActions) except IndexError: raise ParseException(instring, len_instring, self.errmsg, self) else: loc, tokens = self.parseImpl(instring, pre_loc, doActions) except Exception as err: # print("Exception raised:", err) if self.debugActions.debug_fail: self.debugActions.debug_fail( instring, tokens_start, self, err, False ) if self.failAction: self.failAction(instring, tokens_start, self, err) raise else: if callPreParse and self.callPreparse: pre_loc = self.preParse(instring, loc) else: pre_loc = loc tokens_start = pre_loc if self.mayIndexError or pre_loc >= len_instring: try: loc, tokens = self.parseImpl(instring, pre_loc, doActions) except IndexError: raise ParseException(instring, len_instring, self.errmsg, self) else: loc, tokens = self.parseImpl(instring, pre_loc, doActions) tokens = self.postParse(instring, loc, tokens) ret_tokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults ) if self.parseAction and (doActions or self.callDuringTry): if debugging: try: for fn in self.parseAction: try: tokens = fn(instring, tokens_start, ret_tokens) except IndexError as parse_action_exc: exc = ParseException("exception raised in parse action") raise exc from parse_action_exc if tokens is not None and tokens is not ret_tokens: ret_tokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList and isinstance(tokens, (ParseResults, list)), modal=self.modalResults, ) except Exception as err: # print "Exception raised in user parse action:", err if self.debugActions.debug_fail: self.debugActions.debug_fail( instring, tokens_start, self, err, False ) raise else: for fn in self.parseAction: try: tokens = fn(instring, tokens_start, ret_tokens) except IndexError as parse_action_exc: exc = ParseException("exception raised in parse action") raise exc from parse_action_exc if tokens is not None and tokens is not ret_tokens: ret_tokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList and isinstance(tokens, (ParseResults, list)), modal=self.modalResults, ) if debugging: # print("Matched", self, "->", ret_tokens.as_list()) if self.debugActions.debug_match: self.debugActions.debug_match( instring, tokens_start, loc, self, ret_tokens, False ) return loc, ret_tokens def try_parse(self, instring: str, loc: int, raise_fatal: bool = False) -> int: try: return self._parse(instring, loc, doActions=False)[0] except ParseFatalException: if raise_fatal: raise raise ParseException(instring, loc, self.errmsg, self) def can_parse_next(self, instring: str, loc: int) -> bool: try: self.try_parse(instring, loc) except (ParseException, IndexError): return False else: return True # cache for left-recursion in Forward references recursion_lock = RLock() recursion_memos: typing.Dict[ Tuple[int, "Forward", bool], Tuple[int, Union[ParseResults, Exception]] ] = {} # argument cache for optimizing repeated calls when backtracking through recursive expressions packrat_cache = ( {} ) # this is set later by enabled_packrat(); this is here so that reset_cache() doesn't fail packrat_cache_lock = RLock() packrat_cache_stats = [0, 0] # this method gets repeatedly called during backtracking with the same arguments - # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression def _parseCache( self, instring, loc, doActions=True, callPreParse=True ) -> Tuple[int, ParseResults]: HIT, MISS = 0, 1 TRY, MATCH, FAIL = 0, 1, 2 lookup = (self, instring, loc, callPreParse, doActions) with ParserElement.packrat_cache_lock: cache = ParserElement.packrat_cache value = cache.get(lookup) if value is cache.not_in_cache: ParserElement.packrat_cache_stats[MISS] += 1 try: value = self._parseNoCache(instring, loc, doActions, callPreParse) except ParseBaseException as pe: # cache a copy of the exception, without the traceback cache.set(lookup, pe.__class__(pe.args)) raise else: cache.set(lookup, (value[0], value[1].copy(), loc)) return value else: ParserElement.packrat_cache_stats[HIT] += 1 if self.debug and self.debugActions.debug_try: try: self.debugActions.debug_try(instring, loc, self, cache_hit=True) except TypeError: pass if isinstance(value, Exception): if self.debug and self.debugActions.debug_fail: try: self.debugActions.debug_fail( instring, loc, self, value, cache_hit=True ) except TypeError: pass raise value loc_, result, endloc = value[0], value[1].copy(), value[2] if self.debug and self.debugActions.debug_match: try: self.debugActions.debug_match( instring, loc_, endloc, self, result, cache_hit=True ) except TypeError: pass return loc_, result _parse = _parseNoCache @staticmethod def reset_cache() -> None: ParserElement.packrat_cache.clear() ParserElement.packrat_cache_stats[:] = [0] * len( ParserElement.packrat_cache_stats ) ParserElement.recursion_memos.clear() _packratEnabled = False _left_recursion_enabled = False @staticmethod def disable_memoization() -> None: """ Disables active Packrat or Left Recursion parsing and their memoization This method also works if neither Packrat nor Left Recursion are enabled. This makes it safe to call before activating Packrat nor Left Recursion to clear any previous settings. """ ParserElement.reset_cache() ParserElement._left_recursion_enabled = False ParserElement._packratEnabled = False ParserElement._parse = ParserElement._parseNoCache @staticmethod def enable_left_recursion( cache_size_limit: typing.Optional[int] = None, , force=False ) -> None: """ Enables "bounded recursion" parsing, which allows for both direct and indirect left-recursion. During parsing, left-recursive :class:`Forward` elements are repeatedly matched with a fixed recursion depth that is gradually increased until finding the longest match. Example:: import pyparsing as pp pp.ParserElement.enable_left_recursion() E = pp.Forward("E") num = pp.Word(pp.nums) # match `num`, or `num '+' num`, or `num '+' num '+' num`, ... E <<= E + '+' - num \| num print(E.parse_string("1+2+3")) Recursion search naturally memoizes matches of ``Forward`` elements and may thus skip reevaluation of parse actions during backtracking. This may break programs with parse actions which rely on strict ordering of side-effects. Parameters: - cache_size_limit - (default=``None``) - memoize at most this many ``Forward`` elements during matching; if ``None`` (the default), memoize all ``Forward`` elements. Bounded Recursion parsing works similar but not identical to Packrat parsing, thus the two cannot be used together. Use ``force=True`` to disable any previous, conflicting settings. """ if force: ParserElement.disable_memoization() elif ParserElement._packratEnabled: raise RuntimeError("Packrat and Bounded Recursion are not compatible") if cache_size_limit is None: ParserElement.recursion_memos = _UnboundedMemo() elif cache_size_limit > 0: ParserElement.recursion_memos = _LRUMemo(capacity=cache_size_limit) else: raise NotImplementedError("Memo size of %s" % cache_size_limit) ParserElement._left_recursion_enabled = True @staticmethod def enable_packrat(cache_size_limit: int = 128, , force: bool = False) -> None: """ Enables "packrat" parsing, which adds memoizing to the parsing logic. Repeated parse attempts at the same string location (which happens often in many complex grammars) can immediately return a cached value, instead of re-executing parsing/validating code. Memoizing is done of both valid results and parsing exceptions. Parameters: - cache_size_limit - (default= ``128``) - if an integer value is provided will limit the size of the packrat cache; if None is passed, then the cache size will be unbounded; if 0 is passed, the cache will be effectively disabled. This speedup may break existing programs that use parse actions that have side-effects. For this reason, packrat parsing is disabled when you first import pyparsing. To activate the packrat feature, your program must call the class method :class:`ParserElement.enable_packrat`. For best results, call ``enable_packrat()`` immediately after importing pyparsing. Example:: import pyparsing pyparsing.ParserElement.enable_packrat() Packrat parsing works similar but not identical to Bounded Recursion parsing, thus the two cannot be used together. Use ``force=True`` to disable any previous, conflicting settings. """ if force: ParserElement.disable_memoization() elif ParserElement._left_recursion_enabled: raise RuntimeError("Packrat and Bounded Recursion are not compatible") if not ParserElement._packratEnabled: ParserElement._packratEnabled = True if cache_size_limit is None: ParserElement.packrat_cache = _UnboundedCache() else: ParserElement.packrat_cache = _FifoCache(cache_size_limit) ParserElement._parse = ParserElement._parseCache def parse_string( self, instring: str, parse_all: bool = False, , parseAll: bool = False ) -> ParseResults: """ Parse a string with respect to the parser definition. This function is intended as the primary interface to the client code. :param instring: The input string to be parsed. :param parse_all: If set, the entire input string must match the grammar. :param parseAll: retained for pre-PEP8 compatibility, will be removed in a future release. :raises ParseException: Raised if ``parse_all`` is set and the input string does not match the whole grammar. :returns: the parsed data as a :class:`ParseResults` object, which may be accessed as a `list`, a `dict`, or an object with attributes if the given parser includes results names. If the input string is required to match the entire grammar, ``parse_all`` flag must be set to ``True``. This is also equivalent to ending the grammar with :class:`StringEnd`(). To report proper column numbers, ``parse_string`` operates on a copy of the input string where all tabs are converted to spaces (8 spaces per tab, as per the default in ``string.expandtabs``). If the input string contains tabs and the grammar uses parse actions that use the ``loc`` argument to index into the string being parsed, one can ensure a consistent view of the input string by doing one of the following: - calling ``parse_with_tabs`` on your grammar before calling ``parse_string`` (see :class:`parse_with_tabs`), - define your parse action using the full ``(s,loc,toks)`` signature, and reference the input string using the parse action's ``s`` argument, or - explicitly expand the tabs in your input string before calling ``parse_string``. Examples: By default, partial matches are OK. >>> res = Word('a').parse_string('aaaaabaaa') >>> print(res) ['aaaaa'] The parsing behavior varies by the inheriting class of this abstract class. Please refer to the children directly to see more examples. It raises an exception if parse_all flag is set and instring does not match the whole grammar. >>> res = Word('a').parse_string('aaaaabaaa', parse_all=True) Traceback (most recent call last): ... pyparsing.ParseException: Expected end of text, found 'b' (at char 5), (line:1, col:6) """ parseAll = parse_all or parseAll ParserElement.reset_cache() if not self.streamlined: self.streamline() for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = instring.expandtabs() try: loc, tokens = self._parse(instring, 0) if parseAll: loc = self.preParse(instring, loc) se = Empty() + StringEnd() se._parse(instring, loc) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clearing out pyparsing internal stack trace raise exc.with_traceback(None) else: return tokens def scan_string( self, instring: str, max_matches: int = _MAX_INT, overlap: bool = False, , debug: bool = False, maxMatches: int = _MAX_INT, ) -> Generator[Tuple[ParseResults, int, int], None, None]: """ Scan the input string for expression matches. Each match will return the matching tokens, start location, and end location. May be called with optional ``max_matches`` argument, to clip scanning after 'n' matches are found. If ``overlap`` is specified, then overlapping matches will be reported. Note that the start and end locations are reported relative to the string being parsed. See :class:`parse_string` for more information on parsing strings with embedded tabs. Example:: source = "sldjf123lsdjjkf345sldkjf879lkjsfd987" print(source) for tokens, start, end in Word(alphas).scan_string(source): print(' 'start + '^'(end-start)) print(' 'start + tokens[0]) prints:: sldjf123lsdjjkf345sldkjf879lkjsfd987 ^^^^^ sldjf ^^^^^^^ lsdjjkf ^^^^^^ sldkjf ^^^^^^ lkjsfd """ maxMatches = min(maxMatches, max_matches) if not self.streamlined: self.streamline() for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = str(instring).expandtabs() instrlen = len(instring) loc = 0 preparseFn = self.preParse parseFn = self._parse ParserElement.resetCache() matches = 0 try: while loc <= instrlen and matches < maxMatches: try: preloc = preparseFn(instring, loc) nextLoc, tokens = parseFn(instring, preloc, callPreParse=False) except ParseException: loc = preloc + 1 else: if nextLoc > loc: matches += 1 if debug: print( { "tokens": tokens.asList(), "start": preloc, "end": nextLoc, } ) yield tokens, preloc, nextLoc if overlap: nextloc = preparseFn(instring, loc) if nextloc > loc: loc = nextLoc else: loc += 1 else: loc = nextLoc else: loc = preloc + 1 except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc.with_traceback(None) def transform_string(self, instring: str, , debug: bool = False) -> str: """ Extension to :class:`scan_string`, to modify matching text with modified tokens that may be returned from a parse action. To use ``transform_string``, define a grammar and attach a parse action to it that modifies the returned token list. Invoking ``transform_string()`` on a target string will then scan for matches, and replace the matched text patterns according to the logic in the parse action. ``transform_string()`` returns the resulting transformed string. Example:: wd = Word(alphas) wd.set_parse_action(lambda toks: toks[0].title()) print(wd.transform_string("now is the winter of our discontent made glorious summer by this sun of york.")) prints:: Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York. """ out: List[str] = [] lastE = 0 # force preservation of <TAB>s, to minimize unwanted transformation of string, and to # keep string locs straight between transform_string and scan_string self.keepTabs = True try: for t, s, e in self.scan_string(instring, debug=debug): out.append(instring[lastE:s]) if t: if isinstance(t, ParseResults): out += t.as_list() elif isinstance(t, Iterable) and not isinstance(t, str_type): out.extend(t) else: out.append(t) lastE = e out.append(instring[lastE:]) out = [o for o in out if o] return "".join([str(s) for s in _flatten(out)]) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc.with_traceback(None) def search_string( self, instring: str, max_matches: int = _MAX_INT, , debug: bool = False, maxMatches: int = _MAX_INT, ) -> ParseResults: """ Another extension to :class:`scan_string`, simplifying the access to the tokens found to match the given parse expression. May be called with optional ``max_matches`` argument, to clip searching after 'n' matches are found. Example:: # a capitalized word starts with an uppercase letter, followed by zero or more lowercase letters cap_word = Word(alphas.upper(), alphas.lower()) print(cap_word.search_string("More than Iron, more than Lead, more than Gold I need Electricity")) # the sum() builtin can be used to merge results into a single ParseResults object print(sum(cap_word.search_string("More than Iron, more than Lead, more than Gold I need Electricity"))) prints:: [['More'], ['Iron'], ['Lead'], ['Gold'], ['I'], ['Electricity']] ['More', 'Iron', 'Lead', 'Gold', 'I', 'Electricity'] """ maxMatches = min(maxMatches, max_matches) try: return ParseResults( [t for t, s, e in self.scan_string(instring, maxMatches, debug=debug)] ) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc.with_traceback(None) def split( self, instring: str, maxsplit: int = _MAX_INT, include_separators: bool = False, , includeSeparators=False, ) -> Generator[str, None, None]: """ Generator method to split a string using the given expression as a separator. May be called with optional ``maxsplit`` argument, to limit the number of splits; and the optional ``include_separators`` argument (default= ``False``), if the separating matching text should be included in the split results. Example:: punc = one_of(list(".,;:/-!?")) print(list(punc.split("This, this?, this sentence, is badly punctuated!"))) prints:: ['This', ' this', '', ' this sentence', ' is badly punctuated', ''] """ includeSeparators = includeSeparators or include_separators last = 0 for t, s, e in self.scan_string(instring, max_matches=maxsplit): yield instring[last:s] if includeSeparators: yield t[0] last = e yield instring[last:] def __add__(self, other) -> "ParserElement": """ Implementation of ``+`` operator - returns :class:`And`. Adding strings to a :class:`ParserElement` converts them to :class:`Literal`s by default. Example:: greet = Word(alphas) + "," + Word(alphas) + "!" hello = "Hello, World!" print(hello, "->", greet.parse_string(hello)) prints:: Hello, World! -> ['Hello', ',', 'World', '!'] ``...`` may be used as a parse expression as a short form of :class:`SkipTo`. Literal('start') + ... + Literal('end') is equivalent to: Literal('start') + SkipTo('end')("_skipped") + Literal('end') Note that the skipped text is returned with '_skipped' as a results name, and to support having multiple skips in the same parser, the value returned is a list of all skipped text. """ if other is Ellipsis: return _PendingSkip(self) if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return And([self, other]) def __radd__(self, other) -> "ParserElement": """ Implementation of ``+`` operator when left operand is not a :class:`ParserElement` """ if other is Ellipsis: return SkipTo(self)("_skipped") + self if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return other + self def __sub__(self, other) -> "ParserElement": """ Implementation of ``-`` operator, returns :class:`And` with error stop """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return self + And._ErrorStop() + other def __rsub__(self, other) -> "ParserElement": """ Implementation of ``-`` operator when left operand is not a :class:`ParserElement` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return other - self def __mul__(self, other) -> "ParserElement": """ Implementation of ```` operator, allows use of ``expr 3`` in place of ``expr + expr + expr``. Expressions may also be multiplied by a 2-integer tuple, similar to ``{min, max}`` multipliers in regular expressions. Tuples may also include ``None`` as in: - ``expr(n, None)`` or ``expr(n, )`` is equivalent to ``exprn + ZeroOrMore(expr)`` (read as "at least n instances of ``expr``") - ``expr(None, n)`` is equivalent to ``expr(0, n)`` (read as "0 to n instances of ``expr``") - ``expr(None, None)`` is equivalent to ``ZeroOrMore(expr)`` - ``expr(1, None)`` is equivalent to ``OneOrMore(expr)`` Note that ``expr(None, n)`` does not raise an exception if more than n exprs exist in the input stream; that is, ``expr(None, n)`` does not enforce a maximum number of expr occurrences. If this behavior is desired, then write ``expr(None, n) + ~expr`` """ if other is Ellipsis: other = (0, None) elif isinstance(other, tuple) and other[:1] == (Ellipsis,): other = ((0,) + other[1:] + (None,))[:2] if isinstance(other, int): minElements, optElements = other, 0 elif isinstance(other, tuple): other = tuple(o if o is not Ellipsis else None for o in other) other = (other + (None, None))[:2] if other[0] is None: other = (0, other[1]) if isinstance(other[0], int) and other[1] is None: if other[0] == 0: return ZeroOrMore(self) if other[0] == 1: return OneOrMore(self) else: return self * other[0] + ZeroOrMore(self) elif isinstance(other[0], int) and isinstance(other[1], int): minElements, optElements = other optElements -= minElements else: raise TypeError( "cannot multiply ParserElement and ({}) objects".format( ",".join(type(item).__name__ for item in other) ) ) else: raise TypeError( "cannot multiply ParserElement and {} objects".format( type(other).__name__ ) ) if minElements < 0: raise ValueError("cannot multiply ParserElement by negative value") if optElements < 0: raise ValueError( "second tuple value must be greater or equal to first tuple value" ) if minElements == optElements == 0: return And([]) if optElements: def makeOptionalList(n): if n > 1: return Opt(self + makeOptionalList(n - 1)) else: return Opt(self) if minElements: if minElements == 1: ret = self + makeOptionalList(optElements) else: ret = And([self] * minElements) + makeOptionalList(optElements) else: ret = makeOptionalList(optElements) else: if minElements == 1: ret = self else: ret = And([self] * minElements) return ret def __rmul__(self, other) -> "ParserElement": return self.__mul__(other) def __or__(self, other) -> "ParserElement": """ Implementation of ``\|`` operator - returns :class:`MatchFirst` """ if other is Ellipsis: return _PendingSkip(self, must_skip=True) if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return MatchFirst([self, other]) def __ror__(self, other) -> "ParserElement": """ Implementation of ``\|`` operator when left operand is not a :class:`ParserElement` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return other \| self def __xor__(self, other) -> "ParserElement": """ Implementation of ``^`` operator - returns :class:`Or` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return Or([self, other]) def __rxor__(self, other) -> "ParserElement": """ Implementation of ``^`` operator when left operand is not a :class:`ParserElement` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return other ^ self def __and__(self, other) -> "ParserElement": """ Implementation of ``&`` operator - returns :class:`Each` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return Each([self, other]) def __rand__(self, other) -> "ParserElement": """ Implementation of ``&`` operator when left operand is not a :class:`ParserElement` """ if isinstance(other, str_type): other = self._literalStringClass(other) if not isinstance(other, ParserElement): raise TypeError( "Cannot combine element of type {} with ParserElement".format( type(other).__name__ ) ) return other & self def __invert__(self) -> "ParserElement": """ Implementation of ``~`` operator - returns :class:`NotAny` """ return NotAny(self) # disable __iter__ to override legacy use of sequential access to __getitem__ to # iterate over a sequence __iter__ = None def __getitem__(self, key): """ use ``[]`` indexing notation as a short form for expression repetition: - ``expr[n]`` is equivalent to ``exprn`` - ``expr[m, n]`` is equivalent to ``expr(m, n)`` - ``expr[n, ...]`` or ``expr[n,]`` is equivalent to ``exprn + ZeroOrMore(expr)`` (read as "at least n instances of ``expr``") - ``expr[..., n]`` is equivalent to ``expr(0, n)`` (read as "0 to n instances of ``expr``") - ``expr[...]`` and ``expr[0, ...]`` are equivalent to ``ZeroOrMore(expr)`` - ``expr[1, ...]`` is equivalent to ``OneOrMore(expr)`` ``None`` may be used in place of ``...``. Note that ``expr[..., n]`` and ``expr[m, n]``do not raise an exception if more than ``n`` ``expr``s exist in the input stream. If this behavior is desired, then write ``expr[..., n] + ~expr``. """ # convert single arg keys to tuples try: if isinstance(key, str_type): key = (key,) iter(key) except TypeError: key = (key, key) if len(key) > 2: raise TypeError( "only 1 or 2 index arguments supported ({}{})".format( key[:5], "... [{}]".format(len(key)) if len(key) > 5 else "" ) ) # clip to 2 elements ret = self * tuple(key[:2]) return ret def __call__(self, name: str = None) -> "ParserElement": """ Shortcut for :class:`set_results_name`, with ``list_all_matches=False``. If ``name`` is given with a trailing ``''`` character, then ``list_all_matches`` will be passed as ``True``. If ``name` is omitted, same as calling :class:`copy`. Example:: # these are equivalent userdata = Word(alphas).set_results_name("name") + Word(nums + "-").set_results_name("socsecno") userdata = Word(alphas)("name") + Word(nums + "-")("socsecno") """ if name is not None: return self._setResultsName(name) else: return self.copy() def suppress(self) -> "ParserElement": """ Suppresses the output of this :class:`ParserElement`; useful to keep punctuation from cluttering up returned output. """ return Suppress(self) def ignore_whitespace(self, recursive: bool = True) -> "ParserElement": """ Enables the skipping of whitespace before matching the characters in the :class:`ParserElement`'s defined pattern. :param recursive: If ``True`` (the default), also enable whitespace skipping in child elements (if any) """ self.skipWhitespace = True return self def leave_whitespace(self, recursive: bool = True) -> "ParserElement": """ Disables the skipping of whitespace before matching the characters in the :class:`ParserElement`'s defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars. :param recursive: If true (the default), also disable whitespace skipping in child elements (if any) """ self.skipWhitespace = False return self def set_whitespace_chars( self, chars: Union[Set[str], str], copy_defaults: bool = False ) -> "ParserElement": """ Overrides the default whitespace chars """ self.skipWhitespace = True self.whiteChars = set(chars) self.copyDefaultWhiteChars = copy_defaults return self def parse_with_tabs(self) -> "ParserElement": """ Overrides default behavior to expand ``<TAB>`` s to spaces before parsing the input string. Must be called before ``parse_string`` when the input grammar contains elements that match ``<TAB>`` characters. """ self.keepTabs = True return self def ignore(self, other: "ParserElement") -> "ParserElement": """ Define expression to be ignored (e.g., comments) while doing pattern matching; may be called repeatedly, to define multiple comment or other ignorable patterns. Example:: patt = Word(alphas)[1, ...] patt.parse_string('ablaj / comment / lskjd') # -> ['ablaj'] patt.ignore(c_style_comment) patt.parse_string('ablaj / comment / lskjd') # -> ['ablaj', 'lskjd'] """ import typing if isinstance(other, str_type): other = Suppress(other) if isinstance(other, Suppress): if other not in self.ignoreExprs: self.ignoreExprs.append(other) else: self.ignoreExprs.append(Suppress(other.copy())) return self def set_debug_actions( self, start_action: DebugStartAction, success_action: DebugSuccessAction, exception_action: DebugExceptionAction, ) -> "ParserElement": """ Customize display of debugging messages while doing pattern matching: - ``start_action`` - method to be called when an expression is about to be parsed; should have the signature ``fn(input_string: str, location: int, expression: ParserElement, cache_hit: bool)`` - ``success_action`` - method to be called when an expression has successfully parsed; should have the signature ``fn(input_string: str, start_location: int, end_location: int, expression: ParserELement, parsed_tokens: ParseResults, cache_hit: bool)`` - ``exception_action`` - method to be called when expression fails to parse; should have the signature ``fn(input_string: str, location: int, expression: ParserElement, exception: Exception, cache_hit: bool)`` """ self.debugActions = self.DebugActions( start_action or _default_start_debug_action, success_action or _default_success_debug_action, exception_action or _default_exception_debug_action, ) self.debug = True return self def set_debug(self, flag: bool = True) -> "ParserElement": """ Enable display of debugging messages while doing pattern matching. Set ``flag`` to ``True`` to enable, ``False`` to disable. Example:: wd = Word(alphas).set_name("alphaword") integer = Word(nums).set_name("numword") term = wd \| integer # turn on debugging for wd wd.set_debug() term[1, ...].parse_string("abc 123 xyz 890") prints:: Match alphaword at loc 0(1,1) Matched alphaword -> ['abc'] Match alphaword at loc 3(1,4) Exception raised:Expected alphaword (at char 4), (line:1, col:5) Match alphaword at loc 7(1,8) Matched alphaword -> ['xyz'] Match alphaword at loc 11(1,12) Exception raised:Expected alphaword (at char 12), (line:1, col:13) Match alphaword at loc 15(1,16) Exception raised:Expected alphaword (at char 15), (line:1, col:16) The output shown is that produced by the default debug actions - custom debug actions can be specified using :class:`set_debug_actions`. Prior to attempting to match the ``wd`` expression, the debugging message ``"Match <exprname> at loc <n>(<line>,<col>)"`` is shown. Then if the parse succeeds, a ``"Matched"`` message is shown, or an ``"Exception raised"`` message is shown. Also note the use of :class:`set_name` to assign a human-readable name to the expression, which makes debugging and exception messages easier to understand - for instance, the default name created for the :class:`Word` expression without calling ``set_name`` is ``"W:(A-Za-z)"``. """ if flag: self.set_debug_actions( _default_start_debug_action, _default_success_debug_action, _default_exception_debug_action, ) else: self.debug = False return self @property def default_name(self) -> str: if self._defaultName is None: self._defaultName = self._generateDefaultName() return self._defaultName @abstractmethod def _generateDefaultName(self): """ Child classes must define this method, which defines how the ``default_name`` is set. """ def set_name(self, name: str) -> "ParserElement": """ Define name for this expression, makes debugging and exception messages clearer. Example:: Word(nums).parse_string("ABC") # -> Exception: Expected W:(0-9) (at char 0), (line:1, col:1) Word(nums).set_name("integer").parse_string("ABC") # -> Exception: Expected integer (at char 0), (line:1, col:1) """ self.customName = name self.errmsg = "Expected " + self.name if __diag__.enable_debug_on_named_expressions: self.set_debug() return self @property def name(self) -> str: # This will use a user-defined name if available, but otherwise defaults back to the auto-generated name return self.customName if self.customName is not None else self.default_name def __str__(self) -> str: return self.name def __repr__(self) -> str: return str(self) def streamline(self) -> "ParserElement": self.streamlined = True self._defaultName = None return self def recurse(self) -> Sequence["ParserElement"]: return [] def _checkRecursion(self, parseElementList): subRecCheckList = parseElementList[:] + [self] for e in self.recurse(): e._checkRecursion(subRecCheckList) def validate(self, validateTrace=None) -> None: """ Check defined expressions for valid structure, check for infinite recursive definitions. """ self._checkRecursion([]) def parse_file( self, file_or_filename: Union[str, Path, TextIO], encoding: str = "utf-8", parse_all: bool = False, , parseAll: bool = False, ) -> ParseResults: """ Execute the parse expression on the given file or filename. If a filename is specified (instead of a file object), the entire file is opened, read, and closed before parsing. """ parseAll = parseAll or parse_all try: file_contents = file_or_filename.read() except AttributeError: with open(file_or_filename, "r", encoding=encoding) as f: file_contents = f.read() try: return self.parse_string(file_contents, parseAll) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc.with_traceback(None) def __eq__(self, other): if self is other: return True elif isinstance(other, str_type): return self.matches(other, parse_all=True) elif isinstance(other, ParserElement): return vars(self) == vars(other) return False def __hash__(self): return id(self) def matches( self, test_string: str, parse_all: bool = True, , parseAll: bool = True ) -> bool: """ Method for quick testing of a parser against a test string. Good for simple inline microtests of sub expressions while building up larger parser. Parameters: - ``test_string`` - to test against this expression for a match - ``parse_all`` - (default= ``True``) - flag to pass to :class:`parse_string` when running tests Example:: expr = Word(nums) assert expr.matches("100") """ parseAll = parseAll and parse_all try: self.parse_string(str(test_string), parse_all=parseAll) return True except ParseBaseException: return False def run_tests( self, tests: Union[str, List[str]], parse_all: bool = True, comment: typing.Optional[Union["ParserElement", str]] = "#", full_dump: bool = True, print_results: bool = True, failure_tests: bool = False, post_parse: Callable[[str, ParseResults], str] = None, file: typing.Optional[TextIO] = None, with_line_numbers: bool = False, , parseAll: bool = True, fullDump: bool = True, printResults: bool = True, failureTests: bool = False, postParse: Callable[[str, ParseResults], str] = None, ) -> Tuple[bool, List[Tuple[str, Union[ParseResults, Exception]]]]: """ Execute the parse expression on a series of test strings, showing each test, the parsed results or where the parse failed. Quick and easy way to run a parse expression against a list of sample strings. Parameters: - ``tests`` - a list of separate test strings, or a multiline string of test strings - ``parse_all`` - (default= ``True``) - flag to pass to :class:`parse_string` when running tests - ``comment`` - (default= ``'#'``) - expression for indicating embedded comments in the test string; pass None to disable comment filtering - ``full_dump`` - (default= ``True``) - dump results as list followed by results names in nested outline; if False, only dump nested list - ``print_results`` - (default= ``True``) prints test output to stdout - ``failure_tests`` - (default= ``False``) indicates if these tests are expected to fail parsing - ``post_parse`` - (default= ``None``) optional callback for successful parse results; called as `fn(test_string, parse_results)` and returns a string to be added to the test output - ``file`` - (default= ``None``) optional file-like object to which test output will be written; if None, will default to ``sys.stdout`` - ``with_line_numbers`` - default= ``False``) show test strings with line and column numbers Returns: a (success, results) tuple, where success indicates that all tests succeeded (or failed if ``failure_tests`` is True), and the results contain a list of lines of each test's output Example:: number_expr = pyparsing_common.number.copy() result = number_expr.run_tests(''' # unsigned integer 100 # negative integer -100 # float with scientific notation 6.02e23 # integer with scientific notation 1e-12 ''') print("Success" if result[0] else "Failed!") result = number_expr.run_tests(''' # stray character 100Z # missing leading digit before '.' -.100 # too many '.' 3.14.159 ''', failure_tests=True) print("Success" if result[0] else "Failed!") prints:: # unsigned integer 100 [100] # negative integer -100 [-100] # float with scientific notation 6.02e23 [6.02e+23] # integer with scientific notation 1e-12 [1e-12] Success # stray character 100Z ^ FAIL: Expected end of text (at char 3), (line:1, col:4) # missing leading digit before '.' -.100 ^ FAIL: Expected {real number with scientific notation \| real number \| signed integer} (at char 0), (line:1, col:1) # too many '.' 3.14.159 ^ FAIL: Expected end of text (at char 4), (line:1, col:5) Success Each test string must be on a single line. If you want to test a string that spans multiple lines, create a test like this:: expr.run_tests(r"this is a test\\n of strings that spans \\n 3 lines") (Note that this is a raw string literal, you must include the leading ``'r'``.) """ from .testing import pyparsing_test parseAll = parseAll and parse_all fullDump = fullDump and full_dump printResults = printResults and print_results failureTests = failureTests or failure_tests postParse = postParse or post_parse if isinstance(tests, str_type): line_strip = type(tests).strip tests = [line_strip(test_line) for test_line in tests.rstrip().splitlines()] if isinstance(comment, str_type): comment = Literal(comment) if file is None: file = sys.stdout print_ = file.write result: Union[ParseResults, Exception] allResults = [] comments = [] success = True NL = Literal(r"\n").add_parse_action(replace_with("\n")).ignore(quoted_string) BOM = "\ufeff" for t in tests: if comment is not None and comment.matches(t, False) or comments and not t: comments.append( pyparsing_test.with_line_numbers(t) if with_line_numbers else t ) continue if not t: continue out = [ "\n" + "\n".join(comments) if comments else "", pyparsing_test.with_line_numbers(t) if with_line_numbers else t, ] comments = [] try: # convert newline marks to actual newlines, and strip leading BOM if present t = NL.transform_string(t.lstrip(BOM)) result = self.parse_string(t, parse_all=parseAll) except ParseBaseException as pe: fatal = "(FATAL)" if isinstance(pe, ParseFatalException) else "" out.append(pe.explain()) out.append("FAIL: " + str(pe)) if ParserElement.verbose_stacktrace: out.extend(traceback.format_tb(pe.__traceback__)) success = success and failureTests result = pe except Exception as exc: out.append("FAIL-EXCEPTION: {}: {}".format(type(exc).__name__, exc)) if ParserElement.verbose_stacktrace: out.extend(traceback.format_tb(exc.__traceback__)) success = success and failureTests result = exc else: success = success and not failureTests if postParse is not None: try: pp_value = postParse(t, result) if pp_value is not None: if isinstance(pp_value, ParseResults): out.append(pp_value.dump()) else: out.append(str(pp_value)) else: out.append(result.dump()) except Exception as e: out.append(result.dump(full=fullDump)) out.append( "{} failed: {}: {}".format( postParse.__name__, type(e).__name__, e ) ) else: out.append(result.dump(full=fullDump)) out.append("") if printResults: print_("\n".join(out)) allResults.append((t, result)) return success, allResults def create_diagram( self, output_html: Union[TextIO, Path, str], vertical: int = 3, show_results_names: bool = False, show_groups: bool = False, *kwargs, ) -> None: """ Create a railroad diagram for the parser. Parameters: - output_html (str or file-like object) - output target for generated diagram HTML - vertical (int) - threshold for formatting multiple alternatives vertically instead of horizontally (default=3) - show_results_names - bool flag whether diagram should show annotations for defined results names - show_groups - bool flag whether groups should be highlighted with an unlabeled surrounding box Additional diagram-formatting keyword arguments can also be included; see railroad.Diagram class. """ try: from .diagram import to_railroad, railroad_to_html except ImportError as ie: raise Exception( "must ``pip install pyparsing[diagrams]`` to generate parser railroad diagrams" ) from ie self.streamline() railroad = to_railroad( self, vertical=vertical, show_results_names=show_results_names, show_groups=show_groups, diagram_kwargs=kwargs, ) if isinstance(output_html, (str, Path)): with open(output_html, "w", encoding="utf-8") as diag_file: diag_file.write(railroad_to_html(railroad)) else: # we were passed a file-like object, just write to it output_html.write(railroad_to_html(railroad)) setDefaultWhitespaceChars = set_default_whitespace_chars inlineLiteralsUsing = inline_literals_using setResultsName = set_results_name setBreak = set_break setParseAction = set_parse_action addParseAction = add_parse_action addCondition = add_condition setFailAction = set_fail_action tryParse = try_parse canParseNext = can_parse_next resetCache = reset_cache enableLeftRecursion = enable_left_recursion enablePackrat = enable_packrat parseString = parse_string scanString = scan_string searchString = search_string transformString = transform_string setWhitespaceChars = set_whitespace_chars parseWithTabs = parse_with_tabs setDebugActions = set_debug_actions setDebug = set_debug defaultName = default_name setName = set_name parseFile = parse_file runTests = run_tests ignoreWhitespace = ignore_whitespace leaveWhitespace = leave_whitespace class _PendingSkip(ParserElement): # internal placeholder class to hold a place were '...' is added to a parser element, # once another ParserElement is added, this placeholder will be replaced with a SkipTo def __init__(self, expr: ParserElement, must_skip: bool = False): super().__init__() self.anchor = expr self.must_skip = must_skip def _generateDefaultName(self): return str(self.anchor + Empty()).replace("Empty", "...") def __add__(self, other) -> "ParserElement": skipper = SkipTo(other).set_name("...")("_skipped") if self.must_skip: def must_skip(t): if not t._skipped or t._skipped.as_list() == [""]: del t[0] t.pop("_skipped", None) def show_skip(t): if t._skipped.as_list()[-1:] == [""]: t.pop("_skipped") t["_skipped"] = "missing <" + repr(self.anchor) + ">" return ( self.anchor + skipper().add_parse_action(must_skip) \| skipper().add_parse_action(show_skip) ) + other return self.anchor + skipper + other def __repr__(self): return self.defaultName def parseImpl(self, args): raise Exception( "use of `...` expression without following SkipTo target expression" ) class Token(ParserElement): """Abstract :class:`ParserElement` subclass, for defining atomic matching patterns. """ def __init__(self): super().__init__(savelist=False) def _generateDefaultName(self): return type(self).__name__ class Empty(Token): """ An empty token, will always match. """ def __init__(self): super().__init__() self.mayReturnEmpty = True self.mayIndexError = False class NoMatch(Token): """ A token that will never match. """ def __init__(self): super().__init__() self.mayReturnEmpty = True self.mayIndexError = False self.errmsg = "Unmatchable token" def parseImpl(self, instring, loc, doActions=True): raise ParseException(instring, loc, self.errmsg, self) class Literal(Token): """ Token to exactly match a specified string. Example:: Literal('blah').parse_string('blah') # -> ['blah'] Literal('blah').parse_string('blahfooblah') # -> ['blah'] Literal('blah').parse_string('bla') # -> Exception: Expected "blah" For case-insensitive matching, use :class:`CaselessLiteral`. For keyword matching (force word break before and after the matched string), use :class:`Keyword` or :class:`CaselessKeyword`. """ def __init__(self, match_string: str = "", , matchString: str = ""): super().__init__() match_string = matchString or match_string self.match = match_string self.matchLen = len(match_string) try: self.firstMatchChar = match_string[0] except IndexError: raise ValueError("null string passed to Literal; use Empty() instead") self.errmsg = "Expected " + self.name self.mayReturnEmpty = False self.mayIndexError = False # Performance tuning: modify __class__ to select # a parseImpl optimized for single-character check if self.matchLen == 1 and type(self) is Literal: self.__class__ = _SingleCharLiteral def _generateDefaultName(self): return repr(self.match) def parseImpl(self, instring, loc, doActions=True): if instring[loc] == self.firstMatchChar and instring.startswith( self.match, loc ): return loc + self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) class _SingleCharLiteral(Literal): def parseImpl(self, instring, loc, doActions=True): if instring[loc] == self.firstMatchChar: return loc + 1, self.match raise ParseException(instring, loc, self.errmsg, self) ParserElement._literalStringClass = Literal class Keyword(Token): """ Token to exactly match a specified string as a keyword, that is, it must be immediately followed by a non-keyword character. Compare with :class:`Literal`: - ``Literal("if")`` will match the leading ``'if'`` in ``'ifAndOnlyIf'``. - ``Keyword("if")`` will not; it will only match the leading ``'if'`` in ``'if x=1'``, or ``'if(y==2)'`` Accepts two optional constructor arguments in addition to the keyword string: - ``identChars`` is a string of characters that would be valid identifier characters, defaulting to all alphanumerics + "_" and "$" - ``caseless`` allows case-insensitive matching, default is ``False``. Example:: Keyword("start").parse_string("start") # -> ['start'] Keyword("start").parse_string("starting") # -> Exception For case-insensitive matching, use :class:`CaselessKeyword`. """ DEFAULT_KEYWORD_CHARS = alphanums + "_$" def __init__( self, match_string: str = "", ident_chars: typing.Optional[str] = None, caseless: bool = False, , matchString: str = "", identChars: typing.Optional[str] = None, ): super().__init__() identChars = identChars or ident_chars if identChars is None: identChars = Keyword.DEFAULT_KEYWORD_CHARS match_string = matchString or match_string self.match = match_string self.matchLen = len(match_string) try: self.firstMatchChar = match_string[0] except IndexError: raise ValueError("null string passed to Keyword; use Empty() instead") self.errmsg = "Expected {} {}".format(type(self).__name__, self.name) self.mayReturnEmpty = False self.mayIndexError = False self.caseless = caseless if caseless: self.caselessmatch = match_string.upper() identChars = identChars.upper() self.identChars = set(identChars) def _generateDefaultName(self): return repr(self.match) def parseImpl(self, instring, loc, doActions=True): errmsg = self.errmsg errloc = loc if self.caseless: if instring[loc : loc + self.matchLen].upper() == self.caselessmatch: if loc == 0 or instring[loc - 1].upper() not in self.identChars: if ( loc >= len(instring) - self.matchLen or instring[loc + self.matchLen].upper() not in self.identChars ): return loc + self.matchLen, self.match else: # followed by keyword char errmsg += ", was immediately followed by keyword character" errloc = loc + self.matchLen else: # preceded by keyword char errmsg += ", keyword was immediately preceded by keyword character" errloc = loc - 1 # else no match just raise plain exception else: if ( instring[loc] == self.firstMatchChar and self.matchLen == 1 or instring.startswith(self.match, loc) ): if loc == 0 or instring[loc - 1] not in self.identChars: if ( loc >= len(instring) - self.matchLen or instring[loc + self.matchLen] not in self.identChars ): return loc + self.matchLen, self.match else: # followed by keyword char errmsg += ( ", keyword was immediately followed by keyword character" ) errloc = loc + self.matchLen else: # preceded by keyword char errmsg += ", keyword was immediately preceded by keyword character" errloc = loc - 1 # else no match just raise plain exception raise ParseException(instring, errloc, errmsg, self) @staticmethod def set_default_keyword_chars(chars) -> None: """ Overrides the default characters used by :class:`Keyword` expressions. """ Keyword.DEFAULT_KEYWORD_CHARS = chars setDefaultKeywordChars = set_default_keyword_chars class CaselessLiteral(Literal): """ Token to match a specified string, ignoring case of letters. Note: the matched results will always be in the case of the given match string, NOT the case of the input text. Example:: CaselessLiteral("CMD")[1, ...].parse_string("cmd CMD Cmd10") # -> ['CMD', 'CMD', 'CMD'] (Contrast with example for :class:`CaselessKeyword`.) """ def __init__(self, match_string: str = "", , matchString: str = ""): match_string = matchString or match_string super().__init__(match_string.upper()) # Preserve the defining literal. self.returnString = match_string self.errmsg = "Expected " + self.name def parseImpl(self, instring, loc, doActions=True): if instring[loc : loc + self.matchLen].upper() == self.match: return loc + self.matchLen, self.returnString raise ParseException(instring, loc, self.errmsg, self) class CaselessKeyword(Keyword): """ Caseless version of :class:`Keyword`. Example:: CaselessKeyword("CMD")[1, ...].parse_string("cmd CMD Cmd10") # -> ['CMD', 'CMD'] (Contrast with example for :class:`CaselessLiteral`.) """ def __init__( self, match_string: str = "", ident_chars: typing.Optional[str] = None, , matchString: str = "", identChars: typing.Optional[str] = None, ): identChars = identChars or ident_chars match_string = matchString or match_string super().__init__(match_string, identChars, caseless=True) class CloseMatch(Token): """A variation on :class:`Literal` which matches "close" matches, that is, strings with at most 'n' mismatching characters. :class:`CloseMatch` takes parameters: - ``match_string`` - string to be matched - ``caseless`` - a boolean indicating whether to ignore casing when comparing characters - ``max_mismatches`` - (``default=1``) maximum number of mismatches allowed to count as a match The results from a successful parse will contain the matched text from the input string and the following named results: - ``mismatches`` - a list of the positions within the match_string where mismatches were found - ``original`` - the original match_string used to compare against the input string If ``mismatches`` is an empty list, then the match was an exact match. Example:: patt = CloseMatch("ATCATCGAATGGA") patt.parse_string("ATCATCGAAXGGA") # -> (['ATCATCGAAXGGA'], {'mismatches': [[9]], 'original': ['ATCATCGAATGGA']}) patt.parse_string("ATCAXCGAAXGGA") # -> Exception: Expected 'ATCATCGAATGGA' (with up to 1 mismatches) (at char 0), (line:1, col:1) # exact match patt.parse_string("ATCATCGAATGGA") # -> (['ATCATCGAATGGA'], {'mismatches': [[]], 'original': ['ATCATCGAATGGA']}) # close match allowing up to 2 mismatches patt = CloseMatch("ATCATCGAATGGA", max_mismatches=2) patt.parse_string("ATCAXCGAAXGGA") # -> (['ATCAXCGAAXGGA'], {'mismatches': [[4, 9]], 'original': ['ATCATCGAATGGA']}) """ def __init__( self, match_string: str, max_mismatches: int = None, , maxMismatches: int = 1, caseless=False, ): maxMismatches = max_mismatches if max_mismatches is not None else maxMismatches super().__init__() self.match_string = match_string self.maxMismatches = maxMismatches self.errmsg = "Expected {!r} (with up to {} mismatches)".format( self.match_string, self.maxMismatches ) self.caseless = caseless self.mayIndexError = False self.mayReturnEmpty = False def _generateDefaultName(self): return "{}:{!r}".format(type(self).__name__, self.match_string) def parseImpl(self, instring, loc, doActions=True): start = loc instrlen = len(instring) maxloc = start + len(self.match_string) if maxloc <= instrlen: match_string = self.match_string match_stringloc = 0 mismatches = [] maxMismatches = self.maxMismatches for match_stringloc, s_m in enumerate( zip(instring[loc:maxloc], match_string) ): src, mat = s_m if self.caseless: src, mat = src.lower(), mat.lower() if src != mat: mismatches.append(match_stringloc) if len(mismatches) > maxMismatches: break else: loc = start + match_stringloc + 1 results = ParseResults([instring[start:loc]]) results["original"] = match_string results["mismatches"] = mismatches return loc, results raise ParseException(instring, loc, self.errmsg, self) class Word(Token): """Token for matching words composed of allowed character sets. Parameters: - ``init_chars`` - string of all characters that should be used to match as a word; "ABC" will match "AAA", "ABAB", "CBAC", etc.; if ``body_chars`` is also specified, then this is the string of initial characters - ``body_chars`` - string of characters that can be used for matching after a matched initial character as given in ``init_chars``; if omitted, same as the initial characters (default=``None``) - ``min`` - minimum number of characters to match (default=1) - ``max`` - maximum number of characters to match (default=0) - ``exact`` - exact number of characters to match (default=0) - ``as_keyword`` - match as a keyword (default=``False``) - ``exclude_chars`` - characters that might be found in the input ``body_chars`` string but which should not be accepted for matching ;useful to define a word of all printables except for one or two characters, for instance (default=``None``) :class:`srange` is useful for defining custom character set strings for defining :class:`Word` expressions, using range notation from regular expression character sets. A common mistake is to use :class:`Word` to match a specific literal string, as in ``Word("Address")``. Remember that :class:`Word` uses the string argument to define sets of matchable characters. This expression would match "Add", "AAA", "dAred", or any other word made up of the characters 'A', 'd', 'r', 'e', and 's'. To match an exact literal string, use :class:`Literal` or :class:`Keyword`. pyparsing includes helper strings for building Words: - :class:`alphas` - :class:`nums` - :class:`alphanums` - :class:`hexnums` - :class:`alphas8bit` (alphabetic characters in ASCII range 128-255 - accented, tilded, umlauted, etc.) - :class:`punc8bit` (non-alphabetic characters in ASCII range 128-255 - currency, symbols, superscripts, diacriticals, etc.) - :class:`printables` (any non-whitespace character) ``alphas``, ``nums``, and ``printables`` are also defined in several Unicode sets - see :class:`pyparsing_unicode``. Example:: # a word composed of digits integer = Word(nums) # equivalent to Word("0123456789") or Word(srange("0-9")) # a word with a leading capital, and zero or more lowercase capital_word = Word(alphas.upper(), alphas.lower()) # hostnames are alphanumeric, with leading alpha, and '-' hostname = Word(alphas, alphanums + '-') # roman numeral (not a strict parser, accepts invalid mix of characters) roman = Word("IVXLCDM") # any string of non-whitespace characters, except for ',' csv_value = Word(printables, exclude_chars=",") """ def __init__( self, init_chars: str = "", body_chars: typing.Optional[str] = None, min: int = 1, max: int = 0, exact: int = 0, as_keyword: bool = False, exclude_chars: typing.Optional[str] = None, , initChars: typing.Optional[str] = None, bodyChars: typing.Optional[str] = None, asKeyword: bool = False, excludeChars: typing.Optional[str] = None, ): initChars = initChars or init_chars bodyChars = bodyChars or body_chars asKeyword = asKeyword or as_keyword excludeChars = excludeChars or exclude_chars super().__init__() if not initChars: raise ValueError( "invalid {}, initChars cannot be empty string".format( type(self).__name__ ) ) initChars = set(initChars) self.initChars = initChars if excludeChars: excludeChars = set(excludeChars) initChars -= excludeChars if bodyChars: bodyChars = set(bodyChars) - excludeChars self.initCharsOrig = "".join(sorted(initChars)) if bodyChars: self.bodyCharsOrig = "".join(sorted(bodyChars)) self.bodyChars = set(bodyChars) else: self.bodyCharsOrig = "".join(sorted(initChars)) self.bodyChars = set(initChars) self.maxSpecified = max > 0 if min < 1: raise ValueError( "cannot specify a minimum length < 1; use Opt(Word()) if zero-length word is permitted" ) self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.errmsg = "Expected " + self.name self.mayIndexError = False self.asKeyword = asKeyword # see if we can make a regex for this Word if " " not in self.initChars \| self.bodyChars and (min == 1 and exact == 0): if self.bodyChars == self.initChars: if max == 0: repeat = "+" elif max == 1: repeat = "" else: repeat = "{{{},{}}}".format( self.minLen, "" if self.maxLen == _MAX_INT else self.maxLen ) self.reString = "[{}]{}".format( _collapse_string_to_ranges(self.initChars), repeat, ) elif len(self.initChars) == 1: if max == 0: repeat = "" else: repeat = "{{0,{}}}".format(max - 1) self.reString = "{}[{}]{}".format( re.escape(self.initCharsOrig), _collapse_string_to_ranges(self.bodyChars), repeat, ) else: if max == 0: repeat = "" elif max == 2: repeat = "" else: repeat = "{{0,{}}}".format(max - 1) self.reString = "[{}][{}]{}".format( _collapse_string_to_ranges(self.initChars), _collapse_string_to_ranges(self.bodyChars), repeat, ) if self.asKeyword: self.reString = r"\b" + self.reString + r"\b" try: self.re = re.compile(self.reString) except re.error: self.re = None else: self.re_match = self.re.match self.__class__ = _WordRegex def _generateDefaultName(self): def charsAsStr(s): max_repr_len = 16 s = _collapse_string_to_ranges(s, re_escape=False) if len(s) > max_repr_len: return s[: max_repr_len - 3] + "..." else: return s if self.initChars != self.bodyChars: base = "W:({}, {})".format( charsAsStr(self.initChars), charsAsStr(self.bodyChars) ) else: base = "W:({})".format(charsAsStr(self.initChars)) # add length specification if self.minLen > 1 or self.maxLen != _MAX_INT: if self.minLen == self.maxLen: if self.minLen == 1: return base[2:] else: return base + "{{{}}}".format(self.minLen) elif self.maxLen == _MAX_INT: return base + "{{{},...}}".format(self.minLen) else: return base + "{{{},{}}}".format(self.minLen, self.maxLen) return base def parseImpl(self, instring, loc, doActions=True): if instring[loc] not in self.initChars: raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 instrlen = len(instring) bodychars = self.bodyChars maxloc = start + self.maxLen maxloc = min(maxloc, instrlen) while loc < maxloc and instring[loc] in bodychars: loc += 1 throwException = False if loc - start < self.minLen: throwException = True elif self.maxSpecified and loc < instrlen and instring[loc] in bodychars: throwException = True elif self.asKeyword: if ( start > 0 and instring[start - 1] in bodychars or loc < instrlen and instring[loc] in bodychars ): throwException = True if throwException: raise ParseException(instring, loc, self.errmsg, self) return loc, instring[start:loc] class _WordRegex(Word): def parseImpl(self, instring, loc, doActions=True): result = self.re_match(instring, loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() return loc, result.group() class Char(_WordRegex): """A short-cut class for defining :class:`Word` ``(characters, exact=1)``, when defining a match of any single character in a string of characters. """ def __init__( self, charset: str, as_keyword: bool = False, exclude_chars: typing.Optional[str] = None, , asKeyword: bool = False, excludeChars: typing.Optional[str] = None, ): asKeyword = asKeyword or as_keyword excludeChars = excludeChars or exclude_chars super().__init__( charset, exact=1, asKeyword=asKeyword, excludeChars=excludeChars ) self.reString = "[{}]".format(_collapse_string_to_ranges(self.initChars)) if asKeyword: self.reString = r"\b{}\b".format(self.reString) self.re = re.compile(self.reString) self.re_match = self.re.match class Regex(Token): r"""Token for matching strings that match a given regular expression. Defined with string specifying the regular expression in a form recognized by the stdlib Python `re module <https://docs.python.org/3/library/re.html>`_. If the given regex contains named groups (defined using ``(?P<name>...)``), these will be preserved as named :class:`ParseResults`. If instead of the Python stdlib ``re`` module you wish to use a different RE module (such as the ``regex`` module), you can do so by building your ``Regex`` object with a compiled RE that was compiled using ``regex``. Example:: realnum = Regex(r"[+-]?\d+\.\d") # ref: https://stackoverflow.com/questions/267399/how-do-you-match-only-valid-roman-numerals-with-a-regular-expression roman = Regex(r"M{0,4}(CM\|CD\|D?{0,3})(XC\|XL\|L?X{0,3})(IX\|IV\|V?I{0,3})") # named fields in a regex will be returned as named results date = Regex(r'(?P<year>\d{4})-(?P<month>\d\d?)-(?P<day>\d\d?)') # the Regex class will accept re's compiled using the regex module import regex parser = pp.Regex(regex.compile(r'[0-9]')) """ def __init__( self, pattern: Any, flags: Union[re.RegexFlag, int] = 0, as_group_list: bool = False, as_match: bool = False, , asGroupList: bool = False, asMatch: bool = False, ): """The parameters ``pattern`` and ``flags`` are passed to the ``re.compile()`` function as-is. See the Python `re module <https://docs.python.org/3/library/re.html>`_ module for an explanation of the acceptable patterns and flags. """ super().__init__() asGroupList = asGroupList or as_group_list asMatch = asMatch or as_match if isinstance(pattern, str_type): if not pattern: raise ValueError("null string passed to Regex; use Empty() instead") self._re = None self.reString = self.pattern = pattern self.flags = flags elif hasattr(pattern, "pattern") and hasattr(pattern, "match"): self._re = pattern self.pattern = self.reString = pattern.pattern self.flags = flags else: raise TypeError( "Regex may only be constructed with a string or a compiled RE object" ) self.errmsg = "Expected " + self.name self.mayIndexError = False self.asGroupList = asGroupList self.asMatch = asMatch if self.asGroupList: self.parseImpl = self.parseImplAsGroupList if self.asMatch: self.parseImpl = self.parseImplAsMatch @cached_property def re(self): if self._re: return self._re else: try: return re.compile(self.pattern, self.flags) except re.error: raise ValueError( "invalid pattern ({!r}) passed to Regex".format(self.pattern) ) @cached_property def re_match(self): return self.re.match @cached_property def mayReturnEmpty(self): return self.re_match("") is not None def _generateDefaultName(self): return "Re:({})".format(repr(self.pattern).replace("\\\\", "\\")) def parseImpl(self, instring, loc, doActions=True): result = self.re_match(instring, loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = ParseResults(result.group()) d = result.groupdict() if d: for k, v in d.items(): ret[k] = v return loc, ret def parseImplAsGroupList(self, instring, loc, doActions=True): result = self.re_match(instring, loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = result.groups() return loc, ret def parseImplAsMatch(self, instring, loc, doActions=True): result = self.re_match(instring, loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = result return loc, ret def sub(self, repl: str) -> ParserElement: r""" Return :class:`Regex` with an attached parse action to transform the parsed result as if called using `re.sub(expr, repl, string) <https://docs.python.org/3/library/re.html#re.sub>`_. Example:: make_html = Regex(r"(\w+):(.?):").sub(r"<\1>\2</\1>") print(make_html.transform_string("h1:main title:")) # prints "<h1>main title</h1>" """ if self.asGroupList: raise TypeError("cannot use sub() with Regex(asGroupList=True)") if self.asMatch and callable(repl): raise TypeError("cannot use sub() with a callable with Regex(asMatch=True)") if self.asMatch: def pa(tokens): return tokens[0].expand(repl) else: def pa(tokens): return self.re.sub(repl, tokens[0]) return self.add_parse_action(pa) class QuotedString(Token): r""" Token for matching strings that are delimited by quoting characters. Defined with the following parameters: - ``quote_char`` - string of one or more characters defining the quote delimiting string - ``esc_char`` - character to re_escape quotes, typically backslash (default= ``None``) - ``esc_quote`` - special quote sequence to re_escape an embedded quote string (such as SQL's ``""`` to re_escape an embedded ``"``) (default= ``None``) - ``multiline`` - boolean indicating whether quotes can span multiple lines (default= ``False``) - ``unquote_results`` - boolean indicating whether the matched text should be unquoted (default= ``True``) - ``end_quote_char`` - string of one or more characters defining the end of the quote delimited string (default= ``None`` => same as quote_char) - ``convert_whitespace_escapes`` - convert escaped whitespace (``'\t'``, ``'\n'``, etc.) to actual whitespace (default= ``True``) Example:: qs = QuotedString('"') print(qs.search_string('lsjdf "This is the quote" sldjf')) complex_qs = QuotedString('{{', end_quote_char='}}') print(complex_qs.search_string('lsjdf {{This is the "quote"}} sldjf')) sql_qs = QuotedString('"', esc_quote='""') print(sql_qs.search_string('lsjdf "This is the quote with ""embedded"" quotes" sldjf')) prints:: [['This is the quote']] [['This is the "quote"']] [['This is the quote with "embedded" quotes']] """ ws_map = ((r"\t", "\t"), (r"\n", "\n"), (r"\f", "\f"), (r"\r", "\r")) def __init__( self, quote_char: str = "", esc_char: typing.Optional[str] = None, esc_quote: typing.Optional[str] = None, multiline: bool = False, unquote_results: bool = True, end_quote_char: typing.Optional[str] = None, convert_whitespace_escapes: bool = True, , quoteChar: str = "", escChar: typing.Optional[str] = None, escQuote: typing.Optional[str] = None, unquoteResults: bool = True, endQuoteChar: typing.Optional[str] = None, convertWhitespaceEscapes: bool = True, ): super().__init__() escChar = escChar or esc_char escQuote = escQuote or esc_quote unquoteResults = unquoteResults and unquote_results endQuoteChar = endQuoteChar or end_quote_char convertWhitespaceEscapes = ( convertWhitespaceEscapes and convert_whitespace_escapes ) quote_char = quoteChar or quote_char # remove white space from quote chars - wont work anyway quote_char = quote_char.strip() if not quote_char: raise ValueError("quote_char cannot be the empty string") if endQuoteChar is None: endQuoteChar = quote_char else: endQuoteChar = endQuoteChar.strip() if not endQuoteChar: raise ValueError("endQuoteChar cannot be the empty string") self.quoteChar = quote_char self.quoteCharLen = len(quote_char) self.firstQuoteChar = quote_char[0] self.endQuoteChar = endQuoteChar self.endQuoteCharLen = len(endQuoteChar) self.escChar = escChar self.escQuote = escQuote self.unquoteResults = unquoteResults self.convertWhitespaceEscapes = convertWhitespaceEscapes sep = "" inner_pattern = "" if escQuote: inner_pattern += r"{}(?:{})".format(sep, re.escape(escQuote)) sep = "\|" if escChar: inner_pattern += r"{}(?:{}.)".format(sep, re.escape(escChar)) sep = "\|" self.escCharReplacePattern = re.escape(self.escChar) + "(.)" if len(self.endQuoteChar) > 1: inner_pattern += ( "{}(?:".format(sep) + "\|".join( "(?:{}(?!{}))".format( re.escape(self.endQuoteChar[:i]), re.escape(self.endQuoteChar[i:]), ) for i in range(len(self.endQuoteChar) - 1, 0, -1) ) + ")" ) sep = "\|" if multiline: self.flags = re.MULTILINE \| re.DOTALL inner_pattern += r"{}(?:[^{}{}])".format( sep, _escape_regex_range_chars(self.endQuoteChar[0]), (_escape_regex_range_chars(escChar) if escChar is not None else ""), ) else: self.flags = 0 inner_pattern += r"{}(?:[^{}\n\r{}])".format( sep, _escape_regex_range_chars(self.endQuoteChar[0]), (_escape_regex_range_chars(escChar) if escChar is not None else ""), ) self.pattern = "".join( [ re.escape(self.quoteChar), "(?:", inner_pattern, ")", re.escape(self.endQuoteChar), ] ) try: self.re = re.compile(self.pattern, self.flags) self.reString = self.pattern self.re_match = self.re.match except re.error: raise ValueError( "invalid pattern {!r} passed to Regex".format(self.pattern) ) self.errmsg = "Expected " + self.name self.mayIndexError = False self.mayReturnEmpty = True def _generateDefaultName(self): if self.quoteChar == self.endQuoteChar and isinstance(self.quoteChar, str_type): return "string enclosed in {!r}".format(self.quoteChar) return "quoted string, starting with {} ending with {}".format( self.quoteChar, self.endQuoteChar ) def parseImpl(self, instring, loc, doActions=True): result = ( instring[loc] == self.firstQuoteChar and self.re_match(instring, loc) or None ) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = result.group() if self.unquoteResults: # strip off quotes ret = ret[self.quoteCharLen : -self.endQuoteCharLen] if isinstance(ret, str_type): # replace escaped whitespace if "\\" in ret and self.convertWhitespaceEscapes: for wslit, wschar in self.ws_map: ret = ret.replace(wslit, wschar) # replace escaped characters if self.escChar: ret = re.sub(self.escCharReplacePattern, r"\g<1>", ret) # replace escaped quotes if self.escQuote: ret = ret.replace(self.escQuote, self.endQuoteChar) return loc, ret class CharsNotIn(Token): """Token for matching words composed of characters not* in a given set (will include whitespace in matched characters if not listed in the provided exclusion set - see example). Defined with string containing all disallowed characters, and an optional minimum, maximum, and/or exact length. The default value for ``min`` is 1 (a minimum value < 1 is not valid); the default values for ``max`` and ``exact`` are 0, meaning no maximum or exact length restriction. Example:: # define a comma-separated-value as anything that is not a ',' csv_value = CharsNotIn(',') print(delimited_list(csv_value).parse_string("dkls,lsdkjf,s12 34,@!#,213")) prints:: ['dkls', 'lsdkjf', 's12 34', '@!#', '213'] """ def __init__( self, not_chars: str = "", min: int = 1, max: int = 0, exact: int = 0, , notChars: str = "", ): super().__init__() self.skipWhitespace = False self.notChars = not_chars or notChars self.notCharsSet = set(self.notChars) if min < 1: raise ValueError( "cannot specify a minimum length < 1; use " "Opt(CharsNotIn()) if zero-length char group is permitted" ) self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.errmsg = "Expected " + self.name self.mayReturnEmpty = self.minLen == 0 self.mayIndexError = False def _generateDefaultName(self): not_chars_str = _collapse_string_to_ranges(self.notChars) if len(not_chars_str) > 16: return "!W:({}...)".format(self.notChars[: 16 - 3]) else: return "!W:({})".format(self.notChars) def parseImpl(self, instring, loc, doActions=True): notchars = self.notCharsSet if instring[loc] in notchars: raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 maxlen = min(start + self.maxLen, len(instring)) while loc < maxlen and instring[loc] not in notchars: loc += 1 if loc - start < self.minLen: raise ParseException(instring, loc, self.errmsg, self) return loc, instring[start:loc] class White(Token): """Special matching class for matching whitespace. Normally, whitespace is ignored by pyparsing grammars. This class is included when some whitespace structures are significant. Define with a string containing the whitespace characters to be matched; default is ``" \\t\\r\\n"``. Also takes optional ``min``, ``max``, and ``exact`` arguments, as defined for the :class:`Word` class. """ whiteStrs = { " ": "<SP>", "\t": "<TAB>", "\n": "<LF>", "\r": "<CR>", "\f": "<FF>", "\u00A0": "<NBSP>", "\u1680": "<OGHAM_SPACE_MARK>", "\u180E": "<MONGOLIAN_VOWEL_SEPARATOR>", "\u2000": "<EN_QUAD>", "\u2001": "<EM_QUAD>", "\u2002": "<EN_SPACE>", "\u2003": "<EM_SPACE>", "\u2004": "<THREE-PER-EM_SPACE>", "\u2005": "<FOUR-PER-EM_SPACE>", "\u2006": "<SIX-PER-EM_SPACE>", "\u2007": "<FIGURE_SPACE>", "\u2008": "<PUNCTUATION_SPACE>", "\u2009": "<THIN_SPACE>", "\u200A": "<HAIR_SPACE>", "\u200B": "<ZERO_WIDTH_SPACE>", "\u202F": "<NNBSP>", "\u205F": "<MMSP>", "\u3000": "<IDEOGRAPHIC_SPACE>", } def __init__(self, ws: str = " \t\r\n", min: int = 1, max: int = 0, exact: int = 0): super().__init__() self.matchWhite = ws self.set_whitespace_chars( "".join(c for c in self.whiteStrs if c not in self.matchWhite), copy_defaults=True, ) # self.leave_whitespace() self.mayReturnEmpty = True self.errmsg = "Expected " + self.name self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact def _generateDefaultName(self): return "".join(White.whiteStrs[c] for c in self.matchWhite) def parseImpl(self, instring, loc, doActions=True): if instring[loc] not in self.matchWhite: raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 maxloc = start + self.maxLen maxloc = min(maxloc, len(instring)) while loc < maxloc and instring[loc] in self.matchWhite: loc += 1 if loc - start < self.minLen: raise ParseException(instring, loc, self.errmsg, self) return loc, instring[start:loc] class PositionToken(Token): def __init__(self): super().__init__() self.mayReturnEmpty = True self.mayIndexError = False class GoToColumn(PositionToken): """Token to advance to a specific column of input text; useful for tabular report scraping. """ def __init__(self, colno: int): super().__init__() self.col = colno def preParse(self, instring, loc): if col(loc, instring) != self.col: instrlen = len(instring) if self.ignoreExprs: loc = self._skipIgnorables(instring, loc) while ( loc < instrlen and instring[loc].isspace() and col(loc, instring) != self.col ): loc += 1 return loc def parseImpl(self, instring, loc, doActions=True): thiscol = col(loc, instring) if thiscol > self.col: raise ParseException(instring, loc, "Text not in expected column", self) newloc = loc + self.col - thiscol ret = instring[loc:newloc] return newloc, ret class LineStart(PositionToken): r"""Matches if current position is at the beginning of a line within the parse string Example:: test = '''\ AAA this line AAA and this line AAA but not this one B AAA and definitely not this one ''' for t in (LineStart() + 'AAA' + restOfLine).search_string(test): print(t) prints:: ['AAA', ' this line'] ['AAA', ' and this line'] """ def __init__(self): super().__init__() self.leave_whitespace() self.orig_whiteChars = set() \| self.whiteChars self.whiteChars.discard("\n") self.skipper = Empty().set_whitespace_chars(self.whiteChars) self.errmsg = "Expected start of line" def preParse(self, instring, loc): if loc == 0: return loc else: ret = self.skipper.preParse(instring, loc) if "\n" in self.orig_whiteChars: while instring[ret : ret + 1] == "\n": ret = self.skipper.preParse(instring, ret + 1) return ret def parseImpl(self, instring, loc, doActions=True): if col(loc, instring) == 1: return loc, [] raise ParseException(instring, loc, self.errmsg, self) class LineEnd(PositionToken): """Matches if current position is at the end of a line within the parse string """ def __init__(self): super().__init__() self.whiteChars.discard("\n") self.set_whitespace_chars(self.whiteChars, copy_defaults=False) self.errmsg = "Expected end of line" def parseImpl(self, instring, loc, doActions=True): if loc < len(instring): if instring[loc] == "\n": return loc + 1, "\n" else: raise ParseException(instring, loc, self.errmsg, self) elif loc == len(instring): return loc + 1, [] else: raise ParseException(instring, loc, self.errmsg, self) class StringStart(PositionToken): """Matches if current position is at the beginning of the parse string """ def __init__(self): super().__init__() self.errmsg = "Expected start of text" def parseImpl(self, instring, loc, doActions=True): if loc != 0: # see if entire string up to here is just whitespace and ignoreables if loc != self.preParse(instring, 0): raise ParseException(instring, loc, self.errmsg, self) return loc, [] class StringEnd(PositionToken): """ Matches if current position is at the end of the parse string """ def __init__(self): super().__init__() self.errmsg = "Expected end of text" def parseImpl(self, instring, loc, doActions=True): if loc < len(instring): raise ParseException(instring, loc, self.errmsg, self) elif loc == len(instring): return loc + 1, [] elif loc > len(instring): return loc, [] else: raise ParseException(instring, loc, self.errmsg, self) class WordStart(PositionToken): """Matches if the current position is at the beginning of a :class:`Word`, and is not preceded by any character in a given set of ``word_chars`` (default= ``printables``). To emulate the ``\b`` behavior of regular expressions, use ``WordStart(alphanums)``. ``WordStart`` will also match at the beginning of the string being parsed, or at the beginning of a line. """ def __init__(self, word_chars: str = printables, , wordChars: str = printables): wordChars = word_chars if wordChars == printables else wordChars super().__init__() self.wordChars = set(wordChars) self.errmsg = "Not at the start of a word" def parseImpl(self, instring, loc, doActions=True): if loc != 0: if ( instring[loc - 1] in self.wordChars or instring[loc] not in self.wordChars ): raise ParseException(instring, loc, self.errmsg, self) return loc, [] class WordEnd(PositionToken): """Matches if the current position is at the end of a :class:`Word`, and is not followed by any character in a given set of ``word_chars`` (default= ``printables``). To emulate the ``\b`` behavior of regular expressions, use ``WordEnd(alphanums)``. ``WordEnd`` will also match at the end of the string being parsed, or at the end of a line. """ def __init__(self, word_chars: str = printables, , wordChars: str = printables): wordChars = word_chars if wordChars == printables else wordChars super().__init__() self.wordChars = set(wordChars) self.skipWhitespace = False self.errmsg = "Not at the end of a word" def parseImpl(self, instring, loc, doActions=True): instrlen = len(instring) if instrlen > 0 and loc < instrlen: if ( instring[loc] in self.wordChars or instring[loc - 1] not in self.wordChars ): raise ParseException(instring, loc, self.errmsg, self) return loc, [] class ParseExpression(ParserElement): """Abstract subclass of ParserElement, for combining and post-processing parsed tokens. """ def __init__(self, exprs: typing.Iterable[ParserElement], savelist: bool = False): super().__init__(savelist) self.exprs: List[ParserElement] if isinstance(exprs, _generatorType): exprs = list(exprs) if isinstance(exprs, str_type): self.exprs = [self._literalStringClass(exprs)] elif isinstance(exprs, ParserElement): self.exprs = [exprs] elif isinstance(exprs, Iterable): exprs = list(exprs) # if sequence of strings provided, wrap with Literal if any(isinstance(expr, str_type) for expr in exprs): exprs = ( self._literalStringClass(e) if isinstance(e, str_type) else e for e in exprs ) self.exprs = list(exprs) else: try: self.exprs = list(exprs) except TypeError: self.exprs = [exprs] self.callPreparse = False def recurse(self) -> Sequence[ParserElement]: return self.exprs[:] def append(self, other) -> ParserElement: self.exprs.append(other) self._defaultName = None return self def leave_whitespace(self, recursive: bool = True) -> ParserElement: """ Extends ``leave_whitespace`` defined in base class, and also invokes ``leave_whitespace`` on all contained expressions. """ super().leave_whitespace(recursive) if recursive: self.exprs = [e.copy() for e in self.exprs] for e in self.exprs: e.leave_whitespace(recursive) return self def ignore_whitespace(self, recursive: bool = True) -> ParserElement: """ Extends ``ignore_whitespace`` defined in base class, and also invokes ``leave_whitespace`` on all contained expressions. """ super().ignore_whitespace(recursive) if recursive: self.exprs = [e.copy() for e in self.exprs] for e in self.exprs: e.ignore_whitespace(recursive) return self def ignore(self, other) -> ParserElement: if isinstance(other, Suppress): if other not in self.ignoreExprs: super().ignore(other) for e in self.exprs: e.ignore(self.ignoreExprs[-1]) else: super().ignore(other) for e in self.exprs: e.ignore(self.ignoreExprs[-1]) return self def _generateDefaultName(self): return "{}:({})".format(self.__class__.__name__, str(self.exprs)) def streamline(self) -> ParserElement: if self.streamlined: return self super().streamline() for e in self.exprs: e.streamline() # collapse nested :class:`And`'s of the form ``And(And(And(a, b), c), d)`` to ``And(a, b, c, d)`` # but only if there are no parse actions or resultsNames on the nested And's # (likewise for :class:`Or`'s and :class:`MatchFirst`'s) if len(self.exprs) == 2: other = self.exprs[0] if ( isinstance(other, self.__class__) and not other.parseAction and other.resultsName is None and not other.debug ): self.exprs = other.exprs[:] + [self.exprs[1]] self._defaultName = None self.mayReturnEmpty \|= other.mayReturnEmpty self.mayIndexError \|= other.mayIndexError other = self.exprs[-1] if ( isinstance(other, self.__class__) and not other.parseAction and other.resultsName is None and not other.debug ): self.exprs = self.exprs[:-1] + other.exprs[:] self._defaultName = None self.mayReturnEmpty \|= other.mayReturnEmpty self.mayIndexError \|= other.mayIndexError self.errmsg = "Expected " + str(self) return self def validate(self, validateTrace=None) -> None: tmp = (validateTrace if validateTrace is not None else [])[:] + [self] for e in self.exprs: e.validate(tmp) self._checkRecursion([]) def copy(self) -> ParserElement: ret = super().copy() ret.exprs = [e.copy() for e in self.exprs] return ret def _setResultsName(self, name, listAllMatches=False): if ( __diag__.warn_ungrouped_named_tokens_in_collection and Diagnostics.warn_ungrouped_named_tokens_in_collection not in self.suppress_warnings_ ): for e in self.exprs: if ( isinstance(e, ParserElement) and e.resultsName and Diagnostics.warn_ungrouped_named_tokens_in_collection not in e.suppress_warnings_ ): warnings.warn( "{}: setting results name {!r} on {} expression " "collides with {!r} on contained expression".format( "warn_ungrouped_named_tokens_in_collection", name, type(self).__name__, e.resultsName, ), stacklevel=3, ) return super()._setResultsName(name, listAllMatches) ignoreWhitespace = ignore_whitespace leaveWhitespace = leave_whitespace class And(ParseExpression): """ Requires all given :class:`ParseExpression` s to be found in the given order. Expressions may be separated by whitespace. May be constructed using the ``'+'`` operator. May also be constructed using the ``'-'`` operator, which will suppress backtracking. Example:: integer = Word(nums) name_expr = Word(alphas)[1, ...] expr = And([integer("id"), name_expr("name"), integer("age")]) # more easily written as: expr = integer("id") + name_expr("name") + integer("age") """ class _ErrorStop(Empty): def __init__(self, args, *kwargs): super().__init__(args, *kwargs) self.leave_whitespace() def _generateDefaultName(self): return "-" def __init__( self, exprs_arg: typing.Iterable[ParserElement], savelist: bool = True ): exprs: List[ParserElement] = list(exprs_arg) if exprs and Ellipsis in exprs: tmp = [] for i, expr in enumerate(exprs): if expr is Ellipsis: if i < len(exprs) - 1: skipto_arg: ParserElement = (Empty() + exprs[i + 1]).exprs[-1] tmp.append(SkipTo(skipto_arg)("_skipped")) else: raise Exception( "cannot construct And with sequence ending in ..." ) else: tmp.append(expr) exprs[:] = tmp super().__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) if not isinstance(self.exprs[0], White): self.set_whitespace_chars( self.exprs[0].whiteChars, copy_defaults=self.exprs[0].copyDefaultWhiteChars, ) self.skipWhitespace = self.exprs[0].skipWhitespace else: self.skipWhitespace = False else: self.mayReturnEmpty = True self.callPreparse = True def streamline(self) -> ParserElement: # collapse any _PendingSkip's if self.exprs: if any( isinstance(e, ParseExpression) and e.exprs and isinstance(e.exprs[-1], _PendingSkip) for e in self.exprs[:-1] ): for i, e in enumerate(self.exprs[:-1]): if e is None: continue if ( isinstance(e, ParseExpression) and e.exprs and isinstance(e.exprs[-1], _PendingSkip) ): e.exprs[-1] = e.exprs[-1] + self.exprs[i + 1] self.exprs[i + 1] = None self.exprs = [e for e in self.exprs if e is not None] super().streamline() # link any IndentedBlocks to the prior expression for prev, cur in zip(self.exprs, self.exprs[1:]): # traverse cur or any first embedded expr of cur looking for an IndentedBlock # (but watch out for recursive grammar) seen = set() while cur: if id(cur) in seen: break seen.add(id(cur)) if isinstance(cur, IndentedBlock): prev.add_parse_action( lambda s, l, t, cur_=cur: setattr( cur_, "parent_anchor", col(l, s) ) ) break subs = cur.recurse() cur = next(iter(subs), None) self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) return self def parseImpl(self, instring, loc, doActions=True): # pass False as callPreParse arg to _parse for first element, since we already # pre-parsed the string as part of our And pre-parsing loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False ) errorStop = False for e in self.exprs[1:]: # if isinstance(e, And._ErrorStop): if type(e) is And._ErrorStop: errorStop = True continue if errorStop: try: loc, exprtokens = e._parse(instring, loc, doActions) except ParseSyntaxException: raise except ParseBaseException as pe: pe.__traceback__ = None raise ParseSyntaxException._from_exception(pe) except IndexError: raise ParseSyntaxException( instring, len(instring), self.errmsg, self ) else: loc, exprtokens = e._parse(instring, loc, doActions) if exprtokens or exprtokens.haskeys(): resultlist += exprtokens return loc, resultlist def __iadd__(self, other): if isinstance(other, str_type): other = self._literalStringClass(other) return self.append(other) # And([self, other]) def _checkRecursion(self, parseElementList): subRecCheckList = parseElementList[:] + [self] for e in self.exprs: e._checkRecursion(subRecCheckList) if not e.mayReturnEmpty: break def _generateDefaultName(self): inner = " ".join(str(e) for e in self.exprs) # strip off redundant inner {}'s while len(inner) > 1 and inner[0 :: len(inner) - 1] == "{}": inner = inner[1:-1] return "{" + inner + "}" class Or(ParseExpression): """Requires that at least one :class:`ParseExpression` is found. If two expressions match, the expression that matches the longest string will be used. May be constructed using the ``'^'`` operator. Example:: # construct Or using '^' operator number = Word(nums) ^ Combine(Word(nums) + '.' + Word(nums)) print(number.search_string("123 3.1416 789")) prints:: [['123'], ['3.1416'], ['789']] """ def __init__(self, exprs: typing.Iterable[ParserElement], savelist: bool = False): super().__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) self.skipWhitespace = all(e.skipWhitespace for e in self.exprs) else: self.mayReturnEmpty = True def streamline(self) -> ParserElement: super().streamline() if self.exprs: self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) self.saveAsList = any(e.saveAsList for e in self.exprs) self.skipWhitespace = all( e.skipWhitespace and not isinstance(e, White) for e in self.exprs ) else: self.saveAsList = False return self def parseImpl(self, instring, loc, doActions=True): maxExcLoc = -1 maxException = None matches = [] fatals = [] if all(e.callPreparse for e in self.exprs): loc = self.preParse(instring, loc) for e in self.exprs: try: loc2 = e.try_parse(instring, loc, raise_fatal=True) except ParseFatalException as pfe: pfe.__traceback__ = None pfe.parserElement = e fatals.append(pfe) maxException = None maxExcLoc = -1 except ParseException as err: if not fatals: err.__traceback__ = None if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException( instring, len(instring), e.errmsg, self ) maxExcLoc = len(instring) else: # save match among all matches, to retry longest to shortest matches.append((loc2, e)) if matches: # re-evaluate all matches in descending order of length of match, in case attached actions # might change whether or how much they match of the input. matches.sort(key=itemgetter(0), reverse=True) if not doActions: # no further conditions or parse actions to change the selection of # alternative, so the first match will be the best match best_expr = matches[0][1] return best_expr._parse(instring, loc, doActions) longest = -1, None for loc1, expr1 in matches: if loc1 <= longest[0]: # already have a longer match than this one will deliver, we are done return longest try: loc2, toks = expr1._parse(instring, loc, doActions) except ParseException as err: err.__traceback__ = None if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc else: if loc2 >= loc1: return loc2, toks # didn't match as much as before elif loc2 > longest[0]: longest = loc2, toks if longest != (-1, None): return longest if fatals: if len(fatals) > 1: fatals.sort(key=lambda e: -e.loc) if fatals[0].loc == fatals[1].loc: fatals.sort(key=lambda e: (-e.loc, -len(str(e.parserElement)))) max_fatal = fatals[0] raise max_fatal if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException( instring, loc, "no defined alternatives to match", self ) def __ixor__(self, other): if isinstance(other, str_type): other = self._literalStringClass(other) return self.append(other) # Or([self, other]) def _generateDefaultName(self): return "{" + " ^ ".join(str(e) for e in self.exprs) + "}" def _setResultsName(self, name, listAllMatches=False): if ( __diag__.warn_multiple_tokens_in_named_alternation and Diagnostics.warn_multiple_tokens_in_named_alternation not in self.suppress_warnings_ ): if any( isinstance(e, And) and Diagnostics.warn_multiple_tokens_in_named_alternation not in e.suppress_warnings_ for e in self.exprs ): warnings.warn( "{}: setting results name {!r} on {} expression " "will return a list of all parsed tokens in an And alternative, " "in prior versions only the first token was returned; enclose " "contained argument in Group".format( "warn_multiple_tokens_in_named_alternation", name, type(self).__name__, ), stacklevel=3, ) return super()._setResultsName(name, listAllMatches) class MatchFirst(ParseExpression): """Requires that at least one :class:`ParseExpression` is found. If more than one expression matches, the first one listed is the one that will match. May be constructed using the ``'\|'`` operator. Example:: # construct MatchFirst using '\|' operator # watch the order of expressions to match number = Word(nums) \| Combine(Word(nums) + '.' + Word(nums)) print(number.search_string("123 3.1416 789")) # Fail! -> [['123'], ['3'], ['1416'], ['789']] # put more selective expression first number = Combine(Word(nums) + '.' + Word(nums)) \| Word(nums) print(number.search_string("123 3.1416 789")) # Better -> [['123'], ['3.1416'], ['789']] """ def __init__(self, exprs: typing.Iterable[ParserElement], savelist: bool = False): super().__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) self.skipWhitespace = all(e.skipWhitespace for e in self.exprs) else: self.mayReturnEmpty = True def streamline(self) -> ParserElement: if self.streamlined: return self super().streamline() if self.exprs: self.saveAsList = any(e.saveAsList for e in self.exprs) self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) self.skipWhitespace = all( e.skipWhitespace and not isinstance(e, White) for e in self.exprs ) else: self.saveAsList = False self.mayReturnEmpty = True return self def parseImpl(self, instring, loc, doActions=True): maxExcLoc = -1 maxException = None for e in self.exprs: try: return e._parse( instring, loc, doActions, ) except ParseFatalException as pfe: pfe.__traceback__ = None pfe.parserElement = e raise except ParseException as err: if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException( instring, len(instring), e.errmsg, self ) maxExcLoc = len(instring) if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException( instring, loc, "no defined alternatives to match", self ) def __ior__(self, other): if isinstance(other, str_type): other = self._literalStringClass(other) return self.append(other) # MatchFirst([self, other]) def _generateDefaultName(self): return "{" + " \| ".join(str(e) for e in self.exprs) + "}" def _setResultsName(self, name, listAllMatches=False): if ( __diag__.warn_multiple_tokens_in_named_alternation and Diagnostics.warn_multiple_tokens_in_named_alternation not in self.suppress_warnings_ ): if any( isinstance(e, And) and Diagnostics.warn_multiple_tokens_in_named_alternation not in e.suppress_warnings_ for e in self.exprs ): warnings.warn( "{}: setting results name {!r} on {} expression " "will return a list of all parsed tokens in an And alternative, " "in prior versions only the first token was returned; enclose " "contained argument in Group".format( "warn_multiple_tokens_in_named_alternation", name, type(self).__name__, ), stacklevel=3, ) return super()._setResultsName(name, listAllMatches) class Each(ParseExpression): """Requires all given :class:`ParseExpression` s to be found, but in any order. Expressions may be separated by whitespace. May be constructed using the ``'&'`` operator. Example:: color = one_of("RED ORANGE YELLOW GREEN BLUE PURPLE BLACK WHITE BROWN") shape_type = one_of("SQUARE CIRCLE TRIANGLE STAR HEXAGON OCTAGON") integer = Word(nums) shape_attr = "shape:" + shape_type("shape") posn_attr = "posn:" + Group(integer("x") + ',' + integer("y"))("posn") color_attr = "color:" + color("color") size_attr = "size:" + integer("size") # use Each (using operator '&') to accept attributes in any order # (shape and posn are required, color and size are optional) shape_spec = shape_attr & posn_attr & Opt(color_attr) & Opt(size_attr) shape_spec.run_tests(''' shape: SQUARE color: BLACK posn: 100, 120 shape: CIRCLE size: 50 color: BLUE posn: 50,80 color:GREEN size:20 shape:TRIANGLE posn:20,40 ''' ) prints:: shape: SQUARE color: BLACK posn: 100, 120 ['shape:', 'SQUARE', 'color:', 'BLACK', 'posn:', ['100', ',', '120']] - color: BLACK - posn: ['100', ',', '120'] - x: 100 - y: 120 - shape: SQUARE shape: CIRCLE size: 50 color: BLUE posn: 50,80 ['shape:', 'CIRCLE', 'size:', '50', 'color:', 'BLUE', 'posn:', ['50', ',', '80']] - color: BLUE - posn: ['50', ',', '80'] - x: 50 - y: 80 - shape: CIRCLE - size: 50 color: GREEN size: 20 shape: TRIANGLE posn: 20,40 ['color:', 'GREEN', 'size:', '20', 'shape:', 'TRIANGLE', 'posn:', ['20', ',', '40']] - color: GREEN - posn: ['20', ',', '40'] - x: 20 - y: 40 - shape: TRIANGLE - size: 20 """ def __init__(self, exprs: typing.Iterable[ParserElement], savelist: bool = True): super().__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) else: self.mayReturnEmpty = True self.skipWhitespace = True self.initExprGroups = True self.saveAsList = True def streamline(self) -> ParserElement: super().streamline() if self.exprs: self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) else: self.mayReturnEmpty = True return self def parseImpl(self, instring, loc, doActions=True): if self.initExprGroups: self.opt1map = dict( (id(e.expr), e) for e in self.exprs if isinstance(e, Opt) ) opt1 = [e.expr for e in self.exprs if isinstance(e, Opt)] opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e, (Opt, Regex, ZeroOrMore)) ] self.optionals = opt1 + opt2 self.multioptionals = [ e.expr.set_results_name(e.resultsName, list_all_matches=True) for e in self.exprs if isinstance(e, _MultipleMatch) ] self.multirequired = [ e.expr.set_results_name(e.resultsName, list_all_matches=True) for e in self.exprs if isinstance(e, OneOrMore) ] self.required = [ e for e in self.exprs if not isinstance(e, (Opt, ZeroOrMore, OneOrMore)) ] self.required += self.multirequired self.initExprGroups = False tmpLoc = loc tmpReqd = self.required[:] tmpOpt = self.optionals[:] multis = self.multioptionals[:] matchOrder = [] keepMatching = True failed = [] fatals = [] while keepMatching: tmpExprs = tmpReqd + tmpOpt + multis failed.clear() fatals.clear() for e in tmpExprs: try: tmpLoc = e.try_parse(instring, tmpLoc, raise_fatal=True) except ParseFatalException as pfe: pfe.__traceback__ = None pfe.parserElement = e fatals.append(pfe) failed.append(e) except ParseException: failed.append(e) else: matchOrder.append(self.opt1map.get(id(e), e)) if e in tmpReqd: tmpReqd.remove(e) elif e in tmpOpt: tmpOpt.remove(e) if len(failed) == len(tmpExprs): keepMatching = False # look for any ParseFatalExceptions if fatals: if len(fatals) > 1: fatals.sort(key=lambda e: -e.loc) if fatals[0].loc == fatals[1].loc: fatals.sort(key=lambda e: (-e.loc, -len(str(e.parserElement)))) max_fatal = fatals[0] raise max_fatal if tmpReqd: missing = ", ".join([str(e) for e in tmpReqd]) raise ParseException( instring, loc, "Missing one or more required elements ({})".format(missing), ) # add any unmatched Opts, in case they have default values defined matchOrder += [e for e in self.exprs if isinstance(e, Opt) and e.expr in tmpOpt] total_results = ParseResults([]) for e in matchOrder: loc, results = e._parse(instring, loc, doActions) total_results += results return loc, total_results def _generateDefaultName(self): return "{" + " & ".join(str(e) for e in self.exprs) + "}" class ParseElementEnhance(ParserElement): """Abstract subclass of :class:`ParserElement`, for combining and post-processing parsed tokens. """ def __init__(self, expr: Union[ParserElement, str], savelist: bool = False): super().__init__(savelist) if isinstance(expr, str_type): if issubclass(self._literalStringClass, Token): expr = self._literalStringClass(expr) elif issubclass(type(self), self._literalStringClass): expr = Literal(expr) else: expr = self._literalStringClass(Literal(expr)) self.expr = expr if expr is not None: self.mayIndexError = expr.mayIndexError self.mayReturnEmpty = expr.mayReturnEmpty self.set_whitespace_chars( expr.whiteChars, copy_defaults=expr.copyDefaultWhiteChars ) self.skipWhitespace = expr.skipWhitespace self.saveAsList = expr.saveAsList self.callPreparse = expr.callPreparse self.ignoreExprs.extend(expr.ignoreExprs) def recurse(self) -> Sequence[ParserElement]: return [self.expr] if self.expr is not None else [] def parseImpl(self, instring, loc, doActions=True): if self.expr is not None: return self.expr._parse(instring, loc, doActions, callPreParse=False) else: raise ParseException(instring, loc, "No expression defined", self) def leave_whitespace(self, recursive: bool = True) -> ParserElement: super().leave_whitespace(recursive) if recursive: self.expr = self.expr.copy() if self.expr is not None: self.expr.leave_whitespace(recursive) return self def ignore_whitespace(self, recursive: bool = True) -> ParserElement: super().ignore_whitespace(recursive) if recursive: self.expr = self.expr.copy() if self.expr is not None: self.expr.ignore_whitespace(recursive) return self def ignore(self, other) -> ParserElement: if isinstance(other, Suppress): if other not in self.ignoreExprs: super().ignore(other) if self.expr is not None: self.expr.ignore(self.ignoreExprs[-1]) else: super().ignore(other) if self.expr is not None: self.expr.ignore(self.ignoreExprs[-1]) return self def streamline(self) -> ParserElement: super().streamline() if self.expr is not None: self.expr.streamline() return self def _checkRecursion(self, parseElementList): if self in parseElementList: raise RecursiveGrammarException(parseElementList + [self]) subRecCheckList = parseElementList[:] + [self] if self.expr is not None: self.expr._checkRecursion(subRecCheckList) def validate(self, validateTrace=None) -> None: if validateTrace is None: validateTrace = [] tmp = validateTrace[:] + [self] if self.expr is not None: self.expr.validate(tmp) self._checkRecursion([]) def _generateDefaultName(self): return "{}:({})".format(self.__class__.__name__, str(self.expr)) ignoreWhitespace = ignore_whitespace leaveWhitespace = leave_whitespace class IndentedBlock(ParseElementEnhance): """ Expression to match one or more expressions at a given indentation level. Useful for parsing text where structure is implied by indentation (like Python source code). """ class _Indent(Empty): def __init__(self, ref_col: int): super().__init__() self.errmsg = "expected indent at column {}".format(ref_col) self.add_condition(lambda s, l, t: col(l, s) == ref_col) class _IndentGreater(Empty): def __init__(self, ref_col: int): super().__init__() self.errmsg = "expected indent at column greater than {}".format(ref_col) self.add_condition(lambda s, l, t: col(l, s) > ref_col) def __init__( self, expr: ParserElement, , recursive: bool = False, grouped: bool = True ): super().__init__(expr, savelist=True) # if recursive: # raise NotImplementedError("IndentedBlock with recursive is not implemented") self._recursive = recursive self._grouped = grouped self.parent_anchor = 1 def parseImpl(self, instring, loc, doActions=True): # advance parse position to non-whitespace by using an Empty() # this should be the column to be used for all subsequent indented lines anchor_loc = Empty().preParse(instring, loc) # see if self.expr matches at the current location - if not it will raise an exception # and no further work is necessary self.expr.try_parse(instring, anchor_loc, doActions) indent_col = col(anchor_loc, instring) peer_detect_expr = self._Indent(indent_col) inner_expr = Empty() + peer_detect_expr + self.expr if self._recursive: sub_indent = self._IndentGreater(indent_col) nested_block = IndentedBlock( self.expr, recursive=self._recursive, grouped=self._grouped ) nested_block.set_debug(self.debug) nested_block.parent_anchor = indent_col inner_expr += Opt(sub_indent + nested_block) inner_expr.set_name(f"inner {hex(id(inner_expr))[-4:].upper()}@{indent_col}") block = OneOrMore(inner_expr) trailing_undent = self._Indent(self.parent_anchor) \| StringEnd() if self._grouped: wrapper = Group else: wrapper = lambda expr: expr return (wrapper(block) + Optional(trailing_undent)).parseImpl( instring, anchor_loc, doActions ) class AtStringStart(ParseElementEnhance): """Matches if expression matches at the beginning of the parse string:: AtStringStart(Word(nums)).parse_string("123") # prints ["123"] AtStringStart(Word(nums)).parse_string(" 123") # raises ParseException """ def __init__(self, expr: Union[ParserElement, str]): super().__init__(expr) self.callPreparse = False def parseImpl(self, instring, loc, doActions=True): if loc != 0: raise ParseException(instring, loc, "not found at string start") return super().parseImpl(instring, loc, doActions) class AtLineStart(ParseElementEnhance): r"""Matches if an expression matches at the beginning of a line within the parse string Example:: test = '''\ AAA this line AAA and this line AAA but not this one B AAA and definitely not this one ''' for t in (AtLineStart('AAA') + restOfLine).search_string(test): print(t) prints:: ['AAA', ' this line'] ['AAA', ' and this line'] """ def __init__(self, expr: Union[ParserElement, str]): super().__init__(expr) self.callPreparse = False def parseImpl(self, instring, loc, doActions=True): if col(loc, instring) != 1: raise ParseException(instring, loc, "not found at line start") return super().parseImpl(instring, loc, doActions) class FollowedBy(ParseElementEnhance): """Lookahead matching of the given parse expression. ``FollowedBy`` does not* advance the parsing position within the input string, it only verifies that the specified parse expression matches at the current position. ``FollowedBy`` always returns a null token list. If any results names are defined in the lookahead expression, those will be returned for access by name. Example:: # use FollowedBy to match a label only if it is followed by a ':' data_word = Word(alphas) label = data_word + FollowedBy(':') attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join)) attr_expr[1, ...].parse_string("shape: SQUARE color: BLACK posn: upper left").pprint() prints:: [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']] """ def __init__(self, expr: Union[ParserElement, str]): super().__init__(expr) self.mayReturnEmpty = True def parseImpl(self, instring, loc, doActions=True): # by using self._expr.parse and deleting the contents of the returned ParseResults list # we keep any named results that were defined in the FollowedBy expression _, ret = self.expr._parse(instring, loc, doActions=doActions) del ret[:] return loc, ret class PrecededBy(ParseElementEnhance): """Lookbehind matching of the given parse expression. ``PrecededBy`` does not advance the parsing position within the input string, it only verifies that the specified parse expression matches prior to the current position. ``PrecededBy`` always returns a null token list, but if a results name is defined on the given expression, it is returned. Parameters: - expr - expression that must match prior to the current parse location - retreat - (default= ``None``) - (int) maximum number of characters to lookbehind prior to the current parse location If the lookbehind expression is a string, :class:`Literal`, :class:`Keyword`, or a :class:`Word` or :class:`CharsNotIn` with a specified exact or maximum length, then the retreat parameter is not required. Otherwise, retreat must be specified to give a maximum number of characters to look back from the current parse position for a lookbehind match. Example:: # VB-style variable names with type prefixes int_var = PrecededBy("#") + pyparsing_common.identifier str_var = PrecededBy("$") + pyparsing_common.identifier """ def __init__( self, expr: Union[ParserElement, str], retreat: typing.Optional[int] = None ): super().__init__(expr) self.expr = self.expr().leave_whitespace() self.mayReturnEmpty = True self.mayIndexError = False self.exact = False if isinstance(expr, str_type): retreat = len(expr) self.exact = True elif isinstance(expr, (Literal, Keyword)): retreat = expr.matchLen self.exact = True elif isinstance(expr, (Word, CharsNotIn)) and expr.maxLen != _MAX_INT: retreat = expr.maxLen self.exact = True elif isinstance(expr, PositionToken): retreat = 0 self.exact = True self.retreat = retreat self.errmsg = "not preceded by " + str(expr) self.skipWhitespace = False self.parseAction.append(lambda s, l, t: t.__delitem__(slice(None, None))) def parseImpl(self, instring, loc=0, doActions=True): if self.exact: if loc < self.retreat: raise ParseException(instring, loc, self.errmsg) start = loc - self.retreat _, ret = self.expr._parse(instring, start) else: # retreat specified a maximum lookbehind window, iterate test_expr = self.expr + StringEnd() instring_slice = instring[max(0, loc - self.retreat) : loc] last_expr = ParseException(instring, loc, self.errmsg) for offset in range(1, min(loc, self.retreat + 1) + 1): try: # print('trying', offset, instring_slice, repr(instring_slice[loc - offset:])) _, ret = test_expr._parse( instring_slice, len(instring_slice) - offset ) except ParseBaseException as pbe: last_expr = pbe else: break else: raise last_expr return loc, ret class Located(ParseElementEnhance): """ Decorates a returned token with its starting and ending locations in the input string. This helper adds the following results names: - ``locn_start`` - location where matched expression begins - ``locn_end`` - location where matched expression ends - ``value`` - the actual parsed results Be careful if the input text contains ``<TAB>`` characters, you may want to call :class:`ParserElement.parse_with_tabs` Example:: wd = Word(alphas) for match in Located(wd).search_string("ljsdf123lksdjjf123lkkjj1222"): print(match) prints:: [0, ['ljsdf'], 5] [8, ['lksdjjf'], 15] [18, ['lkkjj'], 23] """ def parseImpl(self, instring, loc, doActions=True): start = loc loc, tokens = self.expr._parse(instring, start, doActions, callPreParse=False) ret_tokens = ParseResults([start, tokens, loc]) ret_tokens["locn_start"] = start ret_tokens["value"] = tokens ret_tokens["locn_end"] = loc if self.resultsName: # must return as a list, so that the name will be attached to the complete group return loc, [ret_tokens] else: return loc, ret_tokens class NotAny(ParseElementEnhance): """ Lookahead to disallow matching with the given parse expression. ``NotAny`` does not advance the parsing position within the input string, it only verifies that the specified parse expression does not match at the current position. Also, ``NotAny`` does not skip over leading whitespace. ``NotAny`` always returns a null token list. May be constructed using the ``'~'`` operator. Example:: AND, OR, NOT = map(CaselessKeyword, "AND OR NOT".split()) # take care not to mistake keywords for identifiers ident = ~(AND \| OR \| NOT) + Word(alphas) boolean_term = Opt(NOT) + ident # very crude boolean expression - to support parenthesis groups and # operation hierarchy, use infix_notation boolean_expr = boolean_term + ((AND \| OR) + boolean_term)[...] # integers that are followed by "." are actually floats integer = Word(nums) + ~Char(".") """ def __init__(self, expr: Union[ParserElement, str]): super().__init__(expr) # do NOT use self.leave_whitespace(), don't want to propagate to exprs # self.leave_whitespace() self.skipWhitespace = False self.mayReturnEmpty = True self.errmsg = "Found unwanted token, " + str(self.expr) def parseImpl(self, instring, loc, doActions=True): if self.expr.can_parse_next(instring, loc): raise ParseException(instring, loc, self.errmsg, self) return loc, [] def _generateDefaultName(self): return "~{" + str(self.expr) + "}" class _MultipleMatch(ParseElementEnhance): def __init__( self, expr: ParserElement, stop_on: typing.Optional[Union[ParserElement, str]] = None, , stopOn: typing.Optional[Union[ParserElement, str]] = None, ): super().__init__(expr) stopOn = stopOn or stop_on self.saveAsList = True ender = stopOn if isinstance(ender, str_type): ender = self._literalStringClass(ender) self.stopOn(ender) def stopOn(self, ender) -> ParserElement: if isinstance(ender, str_type): ender = self._literalStringClass(ender) self.not_ender = ~ender if ender is not None else None return self def parseImpl(self, instring, loc, doActions=True): self_expr_parse = self.expr._parse self_skip_ignorables = self._skipIgnorables check_ender = self.not_ender is not None if check_ender: try_not_ender = self.not_ender.tryParse # must be at least one (but first see if we are the stopOn sentinel; # if so, fail) if check_ender: try_not_ender(instring, loc) loc, tokens = self_expr_parse(instring, loc, doActions) try: hasIgnoreExprs = not not self.ignoreExprs while 1: if check_ender: try_not_ender(instring, loc) if hasIgnoreExprs: preloc = self_skip_ignorables(instring, loc) else: preloc = loc loc, tmptokens = self_expr_parse(instring, preloc, doActions) if tmptokens or tmptokens.haskeys(): tokens += tmptokens except (ParseException, IndexError): pass return loc, tokens def _setResultsName(self, name, listAllMatches=False): if ( __diag__.warn_ungrouped_named_tokens_in_collection and Diagnostics.warn_ungrouped_named_tokens_in_collection not in self.suppress_warnings_ ): for e in [self.expr] + self.expr.recurse(): if ( isinstance(e, ParserElement) and e.resultsName and Diagnostics.warn_ungrouped_named_tokens_in_collection not in e.suppress_warnings_ ): warnings.warn( "{}: setting results name {!r} on {} expression " "collides with {!r} on contained expression".format( "warn_ungrouped_named_tokens_in_collection", name, type(self).__name__, e.resultsName, ), stacklevel=3, ) return super()._setResultsName(name, listAllMatches) class OneOrMore(_MultipleMatch): """ Repetition of one or more of the given expression. Parameters: - expr - expression that must match one or more times - stop_on - (default= ``None``) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) Example:: data_word = Word(alphas) label = data_word + FollowedBy(':') attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).set_parse_action(' '.join)) text = "shape: SQUARE posn: upper left color: BLACK" attr_expr[1, ...].parse_string(text).pprint() # Fail! read 'color' as data instead of next label -> [['shape', 'SQUARE color']] # use stop_on attribute for OneOrMore to avoid reading label string as part of the data attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join)) OneOrMore(attr_expr).parse_string(text).pprint() # Better -> [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'BLACK']] # could also be written as (attr_expr (1,)).parse_string(text).pprint() """ def _generateDefaultName(self): return "{" + str(self.expr) + "}..." class ZeroOrMore(_MultipleMatch): """ Optional repetition of zero or more of the given expression. Parameters: - ``expr`` - expression that must match zero or more times - ``stop_on`` - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) - (default= ``None``) Example: similar to :class:`OneOrMore` """ def __init__( self, expr: ParserElement, stop_on: typing.Optional[Union[ParserElement, str]] = None, , stopOn: typing.Optional[Union[ParserElement, str]] = None, ): super().__init__(expr, stopOn=stopOn or stop_on) self.mayReturnEmpty = True def parseImpl(self, instring, loc, doActions=True): try: return super().parseImpl(instring, loc, doActions) except (ParseException, IndexError): return loc, ParseResults([], name=self.resultsName) def _generateDefaultName(self): return "[" + str(self.expr) + "]..." class _NullToken: def __bool__(self): return False def __str__(self): return "" class Opt(ParseElementEnhance): """ Optional matching of the given expression. Parameters: - ``expr`` - expression that must match zero or more times - ``default`` (optional) - value to be returned if the optional expression is not found. Example:: # US postal code can be a 5-digit zip, plus optional 4-digit qualifier zip = Combine(Word(nums, exact=5) + Opt('-' + Word(nums, exact=4))) zip.run_tests(''' # traditional ZIP code 12345 # ZIP+4 form 12101-0001 # invalid ZIP 98765- ''') prints:: # traditional ZIP code 12345 ['12345'] # ZIP+4 form 12101-0001 ['12101-0001'] # invalid ZIP 98765- ^ FAIL: Expected end of text (at char 5), (line:1, col:6) """ __optionalNotMatched = _NullToken() def __init__( self, expr: Union[ParserElement, str], default: Any = __optionalNotMatched ): super().__init__(expr, savelist=False) self.saveAsList = self.expr.saveAsList self.defaultValue = default self.mayReturnEmpty = True def parseImpl(self, instring, loc, doActions=True): self_expr = self.expr try: loc, tokens = self_expr._parse(instring, loc, doActions, callPreParse=False) except (ParseException, IndexError): default_value = self.defaultValue if default_value is not self.__optionalNotMatched: if self_expr.resultsName: tokens = ParseResults([default_value]) tokens[self_expr.resultsName] = default_value else: tokens = [default_value] else: tokens = [] return loc, tokens def _generateDefaultName(self): inner = str(self.expr) # strip off redundant inner {}'s while len(inner) > 1 and inner[0 :: len(inner) - 1] == "{}": inner = inner[1:-1] return "[" + inner + "]" Optional = Opt class SkipTo(ParseElementEnhance): """ Token for skipping over all undefined text until the matched expression is found. Parameters: - ``expr`` - target expression marking the end of the data to be skipped - ``include`` - if ``True``, the target expression is also parsed (the skipped text and target expression are returned as a 2-element list) (default= ``False``). - ``ignore`` - (default= ``None``) used to define grammars (typically quoted strings and comments) that might contain false matches to the target expression - ``fail_on`` - (default= ``None``) define expressions that are not allowed to be included in the skipped test; if found before the target expression is found, the :class:`SkipTo` is not a match Example:: report = ''' Outstanding Issues Report - 1 Jan 2000 # \| Severity \| Description \| Days Open -----+----------+-------------------------------------------+----------- 101 \| Critical \| Intermittent system crash \| 6 94 \| Cosmetic \| Spelling error on Login ('log\|n') \| 14 79 \| Minor \| System slow when running too many reports \| 47 ''' integer = Word(nums) SEP = Suppress('\|') # use SkipTo to simply match everything up until the next SEP # - ignore quoted strings, so that a '\|' character inside a quoted string does not match # - parse action will call token.strip() for each matched token, i.e., the description body string_data = SkipTo(SEP, ignore=quoted_string) string_data.set_parse_action(token_map(str.strip)) ticket_expr = (integer("issue_num") + SEP + string_data("sev") + SEP + string_data("desc") + SEP + integer("days_open")) for tkt in ticket_expr.search_string(report): print tkt.dump() prints:: ['101', 'Critical', 'Intermittent system crash', '6'] - days_open: '6' - desc: 'Intermittent system crash' - issue_num: '101' - sev: 'Critical' ['94', 'Cosmetic', "Spelling error on Login ('log\|n')", '14'] - days_open: '14' - desc: "Spelling error on Login ('log\|n')" - issue_num: '94' - sev: 'Cosmetic' ['79', 'Minor', 'System slow when running too many reports', '47'] - days_open: '47' - desc: 'System slow when running too many reports' - issue_num: '79' - sev: 'Minor' """ def __init__( self, other: Union[ParserElement, str], include: bool = False, ignore: bool = None, fail_on: typing.Optional[Union[ParserElement, str]] = None, , failOn: Union[ParserElement, str] = None, ): super().__init__(other) failOn = failOn or fail_on self.ignoreExpr = ignore self.mayReturnEmpty = True self.mayIndexError = False self.includeMatch = include self.saveAsList = False if isinstance(failOn, str_type): self.failOn = self._literalStringClass(failOn) else: self.failOn = failOn self.errmsg = "No match found for " + str(self.expr) def parseImpl(self, instring, loc, doActions=True): startloc = loc instrlen = len(instring) self_expr_parse = self.expr._parse self_failOn_canParseNext = ( self.failOn.canParseNext if self.failOn is not None else None ) self_ignoreExpr_tryParse = ( self.ignoreExpr.tryParse if self.ignoreExpr is not None else None ) tmploc = loc while tmploc <= instrlen: if self_failOn_canParseNext is not None: # break if failOn expression matches if self_failOn_canParseNext(instring, tmploc): break if self_ignoreExpr_tryParse is not None: # advance past ignore expressions while 1: try: tmploc = self_ignoreExpr_tryParse(instring, tmploc) except ParseBaseException: break try: self_expr_parse(instring, tmploc, doActions=False, callPreParse=False) except (ParseException, IndexError): # no match, advance loc in string tmploc += 1 else: # matched skipto expr, done break else: # ran off the end of the input string without matching skipto expr, fail raise ParseException(instring, loc, self.errmsg, self) # build up return values loc = tmploc skiptext = instring[startloc:loc] skipresult = ParseResults(skiptext) if self.includeMatch: loc, mat = self_expr_parse(instring, loc, doActions, callPreParse=False) skipresult += mat return loc, skipresult class Forward(ParseElementEnhance): """ Forward declaration of an expression to be defined later - used for recursive grammars, such as algebraic infix notation. When the expression is known, it is assigned to the ``Forward`` variable using the ``'<<'`` operator. Note: take care when assigning to ``Forward`` not to overlook precedence of operators. Specifically, ``'\|'`` has a lower precedence than ``'<<'``, so that:: fwd_expr << a \| b \| c will actually be evaluated as:: (fwd_expr << a) \| b \| c thereby leaving b and c out as parseable alternatives. It is recommended that you explicitly group the values inserted into the ``Forward``:: fwd_expr << (a \| b \| c) Converting to use the ``'<<='`` operator instead will avoid this problem. See :class:`ParseResults.pprint` for an example of a recursive parser created using ``Forward``. """ def __init__(self, other: typing.Optional[Union[ParserElement, str]] = None): self.caller_frame = traceback.extract_stack(limit=2)[0] super().__init__(other, savelist=False) self.lshift_line = None def __lshift__(self, other): if hasattr(self, "caller_frame"): del self.caller_frame if isinstance(other, str_type): other = self._literalStringClass(other) self.expr = other self.mayIndexError = self.expr.mayIndexError self.mayReturnEmpty = self.expr.mayReturnEmpty self.set_whitespace_chars( self.expr.whiteChars, copy_defaults=self.expr.copyDefaultWhiteChars ) self.skipWhitespace = self.expr.skipWhitespace self.saveAsList = self.expr.saveAsList self.ignoreExprs.extend(self.expr.ignoreExprs) self.lshift_line = traceback.extract_stack(limit=2)[-2] return self def __ilshift__(self, other): return self << other def __or__(self, other): caller_line = traceback.extract_stack(limit=2)[-2] if ( __diag__.warn_on_match_first_with_lshift_operator and caller_line == self.lshift_line and Diagnostics.warn_on_match_first_with_lshift_operator not in self.suppress_warnings_ ): warnings.warn( "using '<<' operator with '\|' is probably an error, use '<<='", stacklevel=2, ) ret = super().__or__(other) return ret def __del__(self): # see if we are getting dropped because of '=' reassignment of var instead of '<<=' or '<<' if ( self.expr is None and __diag__.warn_on_assignment_to_Forward and Diagnostics.warn_on_assignment_to_Forward not in self.suppress_warnings_ ): warnings.warn_explicit( "Forward defined here but no expression attached later using '<<=' or '<<'", UserWarning, filename=self.caller_frame.filename, lineno=self.caller_frame.lineno, ) def parseImpl(self, instring, loc, doActions=True): if ( self.expr is None and __diag__.warn_on_parse_using_empty_Forward and Diagnostics.warn_on_parse_using_empty_Forward not in self.suppress_warnings_ ): # walk stack until parse_string, scan_string, search_string, or transform_string is found parse_fns = [ "parse_string", "scan_string", "search_string", "transform_string", ] tb = traceback.extract_stack(limit=200) for i, frm in enumerate(reversed(tb), start=1): if frm.name in parse_fns: stacklevel = i + 1 break else: stacklevel = 2 warnings.warn( "Forward expression was never assigned a value, will not parse any input", stacklevel=stacklevel, ) if not ParserElement._left_recursion_enabled: return super().parseImpl(instring, loc, doActions) # ## Bounded Recursion algorithm ## # Recursion only needs to be processed at ``Forward`` elements, since they are # the only ones that can actually refer to themselves. The general idea is # to handle recursion stepwise: We start at no recursion, then recurse once, # recurse twice, ..., until more recursion offers no benefit (we hit the bound). # # The "trick" here is that each ``Forward`` gets evaluated in two contexts # - to match a specific recursion level, and # - to search the bounded recursion level # and the two run concurrently. The search must match each recursion level # to find the best possible match. This is handled by a memo table, which # provides the previous match to the next level match attempt. # # See also "Left Recursion in Parsing Expression Grammars", Medeiros et al. # # There is a complication since we not only parse but also transform via # actions: We do not want to run the actions too often while expanding. Thus, # we expand using `doActions=False` and only run `doActions=True` if the next # recursion level is acceptable. with ParserElement.recursion_lock: memo = ParserElement.recursion_memos try: # we are parsing at a specific recursion expansion - use it as-is prev_loc, prev_result = memo[loc, self, doActions] if isinstance(prev_result, Exception): raise prev_result return prev_loc, prev_result.copy() except KeyError: act_key = (loc, self, True) peek_key = (loc, self, False) # we are searching for the best recursion expansion - keep on improving # both `doActions` cases must be tracked separately here! prev_loc, prev_peek = memo[peek_key] = ( loc - 1, ParseException( instring, loc, "Forward recursion without base case", self ), ) if doActions: memo[act_key] = memo[peek_key] while True: try: new_loc, new_peek = super().parseImpl(instring, loc, False) except ParseException: # we failed before getting any match – do not hide the error if isinstance(prev_peek, Exception): raise new_loc, new_peek = prev_loc, prev_peek # the match did not get better: we are done if new_loc <= prev_loc: if doActions: # replace the match for doActions=False as well, # in case the action did backtrack prev_loc, prev_result = memo[peek_key] = memo[act_key] del memo[peek_key], memo[act_key] return prev_loc, prev_result.copy() del memo[peek_key] return prev_loc, prev_peek.copy() # the match did get better: see if we can improve further else: if doActions: try: memo[act_key] = super().parseImpl(instring, loc, True) except ParseException as e: memo[peek_key] = memo[act_key] = (new_loc, e) raise prev_loc, prev_peek = memo[peek_key] = new_loc, new_peek def leave_whitespace(self, recursive: bool = True) -> ParserElement: self.skipWhitespace = False return self def ignore_whitespace(self, recursive: bool = True) -> ParserElement: self.skipWhitespace = True return self def streamline(self) -> ParserElement: if not self.streamlined: self.streamlined = True if self.expr is not None: self.expr.streamline() return self def validate(self, validateTrace=None) -> None: if validateTrace is None: validateTrace = [] if self not in validateTrace: tmp = validateTrace[:] + [self] if self.expr is not None: self.expr.validate(tmp) self._checkRecursion([]) def _generateDefaultName(self): # Avoid infinite recursion by setting a temporary _defaultName self._defaultName = ": ..." # Use the string representation of main expression. retString = "..." try: if self.expr is not None: retString = str(self.expr)[:1000] else: retString = "None" finally: return self.__class__.__name__ + ": " + retString def copy(self) -> ParserElement: if self.expr is not None: return super().copy() else: ret = Forward() ret <<= self return ret def _setResultsName(self, name, list_all_matches=False): if ( __diag__.warn_name_set_on_empty_Forward and Diagnostics.warn_name_set_on_empty_Forward not in self.suppress_warnings_ ): if self.expr is None: warnings.warn( "{}: setting results name {!r} on {} expression " "that has no contained expression".format( "warn_name_set_on_empty_Forward", name, type(self).__name__ ), stacklevel=3, ) return super()._setResultsName(name, list_all_matches) ignoreWhitespace = ignore_whitespace leaveWhitespace = leave_whitespace class TokenConverter(ParseElementEnhance): """ Abstract subclass of :class:`ParseExpression`, for converting parsed results. """ def __init__(self, expr: Union[ParserElement, str], savelist=False): super().__init__(expr) # , savelist) self.saveAsList = False class Combine(TokenConverter): """Converter to concatenate all matching tokens to a single string. By default, the matching patterns must also be contiguous in the input string; this can be disabled by specifying ``'adjacent=False'`` in the constructor. Example:: real = Word(nums) + '.' + Word(nums) print(real.parse_string('3.1416')) # -> ['3', '.', '1416'] # will also erroneously match the following print(real.parse_string('3. 1416')) # -> ['3', '.', '1416'] real = Combine(Word(nums) + '.' + Word(nums)) print(real.parse_string('3.1416')) # -> ['3.1416'] # no match when there are internal spaces print(real.parse_string('3. 1416')) # -> Exception: Expected W:(0123...) """ def __init__( self, expr: ParserElement, join_string: str = "", adjacent: bool = True, , joinString: typing.Optional[str] = None, ): super().__init__(expr) joinString = joinString if joinString is not None else join_string # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself if adjacent: self.leave_whitespace() self.adjacent = adjacent self.skipWhitespace = True self.joinString = joinString self.callPreparse = True def ignore(self, other) -> ParserElement: if self.adjacent: ParserElement.ignore(self, other) else: super().ignore(other) return self def postParse(self, instring, loc, tokenlist): retToks = tokenlist.copy() del retToks[:] retToks += ParseResults( ["".join(tokenlist._asStringList(self.joinString))], modal=self.modalResults ) if self.resultsName and retToks.haskeys(): return [retToks] else: return retToks class Group(TokenConverter): """Converter to return the matched tokens as a list - useful for returning tokens of :class:`ZeroOrMore` and :class:`OneOrMore` expressions. The optional ``aslist`` argument when set to True will return the parsed tokens as a Python list instead of a pyparsing ParseResults. Example:: ident = Word(alphas) num = Word(nums) term = ident \| num func = ident + Opt(delimited_list(term)) print(func.parse_string("fn a, b, 100")) # -> ['fn', 'a', 'b', '100'] func = ident + Group(Opt(delimited_list(term))) print(func.parse_string("fn a, b, 100")) # -> ['fn', ['a', 'b', '100']] """ def __init__(self, expr: ParserElement, aslist: bool = False): super().__init__(expr) self.saveAsList = True self._asPythonList = aslist def postParse(self, instring, loc, tokenlist): if self._asPythonList: return ParseResults.List( tokenlist.asList() if isinstance(tokenlist, ParseResults) else list(tokenlist) ) else: return [tokenlist] class Dict(TokenConverter): """Converter to return a repetitive expression as a list, but also as a dictionary. Each element can also be referenced using the first token in the expression as its key. Useful for tabular report scraping when the first column can be used as a item key. The optional ``asdict`` argument when set to True will return the parsed tokens as a Python dict instead of a pyparsing ParseResults. Example:: data_word = Word(alphas) label = data_word + FollowedBy(':') text = "shape: SQUARE posn: upper left color: light blue texture: burlap" attr_expr = (label + Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join)) # print attributes as plain groups print(attr_expr[1, ...].parse_string(text).dump()) # instead of OneOrMore(expr), parse using Dict(Group(expr)[1, ...]) - Dict will auto-assign names result = Dict(Group(attr_expr)[1, ...]).parse_string(text) print(result.dump()) # access named fields as dict entries, or output as dict print(result['shape']) print(result.as_dict()) prints:: ['shape', 'SQUARE', 'posn', 'upper left', 'color', 'light blue', 'texture', 'burlap'] [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] - color: 'light blue' - posn: 'upper left' - shape: 'SQUARE' - texture: 'burlap' SQUARE {'color': 'light blue', 'posn': 'upper left', 'texture': 'burlap', 'shape': 'SQUARE'} See more examples at :class:`ParseResults` of accessing fields by results name. """ def __init__(self, expr: ParserElement, asdict: bool = False): super().__init__(expr) self.saveAsList = True self._asPythonDict = asdict def postParse(self, instring, loc, tokenlist): for i, tok in enumerate(tokenlist): if len(tok) == 0: continue ikey = tok[0] if isinstance(ikey, int): ikey = str(ikey).strip() if len(tok) == 1: tokenlist[ikey] = _ParseResultsWithOffset("", i) elif len(tok) == 2 and not isinstance(tok[1], ParseResults): tokenlist[ikey] = _ParseResultsWithOffset(tok[1], i) else: try: dictvalue = tok.copy() # ParseResults(i) except Exception: exc = TypeError( "could not extract dict values from parsed results" " - Dict expression must contain Grouped expressions" ) raise exc from None del dictvalue[0] if len(dictvalue) != 1 or ( isinstance(dictvalue, ParseResults) and dictvalue.haskeys() ): tokenlist[ikey] = _ParseResultsWithOffset(dictvalue, i) else: tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0], i) if self._asPythonDict: return [tokenlist.as_dict()] if self.resultsName else tokenlist.as_dict() else: return [tokenlist] if self.resultsName else tokenlist class Suppress(TokenConverter): """Converter for ignoring the results of a parsed expression. Example:: source = "a, b, c,d" wd = Word(alphas) wd_list1 = wd + (',' + wd)[...] print(wd_list1.parse_string(source)) # often, delimiters that are useful during parsing are just in the # way afterward - use Suppress to keep them out of the parsed output wd_list2 = wd + (Suppress(',') + wd)[...] print(wd_list2.parse_string(source)) # Skipped text (using '...') can be suppressed as well source = "lead in START relevant text END trailing text" start_marker = Keyword("START") end_marker = Keyword("END") find_body = Suppress(...) + start_marker + ... + end_marker print(find_body.parse_string(source) prints:: ['a', ',', 'b', ',', 'c', ',', 'd'] ['a', 'b', 'c', 'd'] ['START', 'relevant text ', 'END'] (See also :class:`delimited_list`.) """ def __init__(self, expr: Union[ParserElement, str], savelist: bool = False): if expr is ...: expr = _PendingSkip(NoMatch()) super().__init__(expr) def __add__(self, other) -> "ParserElement": if isinstance(self.expr, _PendingSkip): return Suppress(SkipTo(other)) + other else: return super().__add__(other) def __sub__(self, other) -> "ParserElement": if isinstance(self.expr, _PendingSkip): return Suppress(SkipTo(other)) - other else: return super().__sub__(other) def postParse(self, instring, loc, tokenlist): return [] def suppress(self) -> ParserElement: return self def trace_parse_action(f: ParseAction) -> ParseAction: """Decorator for debugging parse actions. When the parse action is called, this decorator will print ``">> entering method-name(line:<current_source_line>, <parse_location>, <matched_tokens>)"``. When the parse action completes, the decorator will print ``"<<"`` followed by the returned value, or any exception that the parse action raised. Example:: wd = Word(alphas) @trace_parse_action def remove_duplicate_chars(tokens): return ''.join(sorted(set(''.join(tokens)))) wds = wd[1, ...].set_parse_action(remove_duplicate_chars) print(wds.parse_string("slkdjs sld sldd sdlf sdljf")) prints:: >>entering remove_duplicate_chars(line: 'slkdjs sld sldd sdlf sdljf', 0, (['slkdjs', 'sld', 'sldd', 'sdlf', 'sdljf'], {})) <<leaving remove_duplicate_chars (ret: 'dfjkls') ['dfjkls'] """ f = _trim_arity(f) def z(paArgs): thisFunc = f.__name__ s, l, t = paArgs[-3:] if len(paArgs) > 3: thisFunc = paArgs[0].__class__.__name__ + "." + thisFunc sys.stderr.write( ">>entering {}(line: {!r}, {}, {!r})\n".format(thisFunc, line(l, s), l, t) ) try: ret = f(paArgs) except Exception as exc: sys.stderr.write("<<leaving {} (exception: {})\n".format(thisFunc, exc)) raise sys.stderr.write("<<leaving {} (ret: {!r})\n".format(thisFunc, ret)) return ret z.__name__ = f.__name__ return z # convenience constants for positional expressions empty = Empty().set_name("empty") line_start = LineStart().set_name("line_start") line_end = LineEnd().set_name("line_end") string_start = StringStart().set_name("string_start") string_end = StringEnd().set_name("string_end") _escapedPunc = Word(_bslash, r"\[]-.$+^?()~ ", exact=2).set_parse_action( lambda s, l, t: t[0][1] ) _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").set_parse_action( lambda s, l, t: chr(int(t[0].lstrip(r"\0x"), 16)) ) _escapedOctChar = Regex(r"\\0[0-7]+").set_parse_action( lambda s, l, t: chr(int(t[0][1:], 8)) ) _singleChar = ( _escapedPunc \| _escapedHexChar \| _escapedOctChar \| CharsNotIn(r"\]", exact=1) ) _charRange = Group(_singleChar + Suppress("-") + _singleChar) _reBracketExpr = ( Literal("[") + Opt("^").set_results_name("negate") + Group(OneOrMore(_charRange \| _singleChar)).set_results_name("body") + "]" ) def srange(s: str) -> str: r"""Helper to easily define string ranges for use in :class:`Word` construction. Borrows syntax from regexp ``'[]'`` string range definitions:: srange("[0-9]") -> "0123456789" srange("[a-z]") -> "abcdefghijklmnopqrstuvwxyz" srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_" The input string must be enclosed in []'s, and the returned string is the expanded character set joined into a single string. The values enclosed in the []'s may be: - a single character - an escaped character with a leading backslash (such as ``\-`` or ``\]``) - an escaped hex character with a leading ``'\x'`` (``\x21``, which is a ``'!'`` character) (``\0x##`` is also supported for backwards compatibility) - an escaped octal character with a leading ``'\0'`` (``\041``, which is a ``'!'`` character) - a range of any of the above, separated by a dash (``'a-z'``, etc.) - any combination of the above (``'aeiouy'``, ``'a-zA-Z0-9_$'``, etc.) """ _expanded = ( lambda p: p if not isinstance(p, ParseResults) else "".join(chr(c) for c in range(ord(p[0]), ord(p[1]) + 1)) ) try: return "".join(_expanded(part) for part in _reBracketExpr.parse_string(s).body) except Exception: return "" def token_map(func, args) -> ParseAction: """Helper to define a parse action by mapping a function to all elements of a :class:`ParseResults` list. If any additional args are passed, they are forwarded to the given function as additional arguments after the token, as in ``hex_integer = Word(hexnums).set_parse_action(token_map(int, 16))``, which will convert the parsed data to an integer using base 16. Example (compare the last to example in :class:`ParserElement.transform_string`:: hex_ints = Word(hexnums)[1, ...].set_parse_action(token_map(int, 16)) hex_ints.run_tests(''' 00 11 22 aa FF 0a 0d 1a ''') upperword = Word(alphas).set_parse_action(token_map(str.upper)) upperword[1, ...].run_tests(''' my kingdom for a horse ''') wd = Word(alphas).set_parse_action(token_map(str.title)) wd[1, ...].set_parse_action(' '.join).run_tests(''' now is the winter of our discontent made glorious summer by this sun of york ''') prints:: 00 11 22 aa FF 0a 0d 1a [0, 17, 34, 170, 255, 10, 13, 26] my kingdom for a horse ['MY', 'KINGDOM', 'FOR', 'A', 'HORSE'] now is the winter of our discontent made glorious summer by this sun of york ['Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York'] """ def pa(s, l, t): return [func(tokn, args) for tokn in t] func_name = getattr(func, "__name__", getattr(func, "__class__").__name__) pa.__name__ = func_name return pa def autoname_elements() -> None: """ Utility to simplify mass-naming of parser elements, for generating railroad diagram with named subdiagrams. """ for name, var in sys._getframe().f_back.f_locals.items(): if isinstance(var, ParserElement) and not var.customName: var.set_name(name) dbl_quoted_string = Combine( Regex(r'"(?:[^"\n\r\\]\|(?:"")\|(?:\\(?:[^x]\|x[0-9a-fA-F]+)))') + '"' ).set_name("string enclosed in double quotes") sgl_quoted_string = Combine( Regex(r"'(?:[^'\n\r\\]\|(?:'')\|(?:\\(?:[^x]\|x[0-9a-fA-F]+)))") + "'" ).set_name("string enclosed in single quotes") quoted_string = Combine( Regex(r'"(?:[^"\n\r\\]\|(?:"")\|(?:\\(?:[^x]\|x[0-9a-fA-F]+)))') + '"' \| Regex(r"'(?:[^'\n\r\\]\|(?:'')\|(?:\\(?:[^x]\|x[0-9a-fA-F]+)))") + "'" ).set_name("quotedString using single or double quotes") unicode_string = Combine("u" + quoted_string.copy()).set_name("unicode string literal") alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]") punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]") # build list of built-in expressions, for future reference if a global default value # gets updated _builtin_exprs: List[ParserElement] = [ v for v in vars().values() if isinstance(v, ParserElement) ] # backward compatibility names tokenMap = token_map conditionAsParseAction = condition_as_parse_action nullDebugAction = null_debug_action sglQuotedString = sgl_quoted_string dblQuotedString = dbl_quoted_string quotedString = quoted_string unicodeString = unicode_string lineStart = line_start lineEnd = line_end stringStart = string_start stringEnd = string_end traceParseAction = trace_parse_action	208.31 KB	2026-01-20 12:58
📁 diagram	-	2026-03-21 15:45
📄 exceptions.py # exceptions.py import re import sys import typing from .util import col, line, lineno, _collapse_string_to_ranges from .unicode import pyparsing_unicode as ppu class ExceptionWordUnicode(ppu.Latin1, ppu.LatinA, ppu.LatinB, ppu.Greek, ppu.Cyrillic): pass _extract_alphanums = _collapse_string_to_ranges(ExceptionWordUnicode.alphanums) _exception_word_extractor = re.compile("([" + _extract_alphanums + "]{1,16})\|.") class ParseBaseException(Exception): """base exception class for all parsing runtime exceptions""" # Performance tuning: we construct a lot of these, so keep this # constructor as small and fast as possible def __init__( self, pstr: str, loc: int = 0, msg: typing.Optional[str] = None, elem=None, ): self.loc = loc if msg is None: self.msg = pstr self.pstr = "" else: self.msg = msg self.pstr = pstr self.parser_element = self.parserElement = elem self.args = (pstr, loc, msg) @staticmethod def explain_exception(exc, depth=16): """ Method to take an exception and translate the Python internal traceback into a list of the pyparsing expressions that caused the exception to be raised. Parameters: - exc - exception raised during parsing (need not be a ParseException, in support of Python exceptions that might be raised in a parse action) - depth (default=16) - number of levels back in the stack trace to list expression and function names; if None, the full stack trace names will be listed; if 0, only the failing input line, marker, and exception string will be shown Returns a multi-line string listing the ParserElements and/or function names in the exception's stack trace. """ import inspect from .core import ParserElement if depth is None: depth = sys.getrecursionlimit() ret = [] if isinstance(exc, ParseBaseException): ret.append(exc.line) ret.append(" " * (exc.column - 1) + "^") ret.append("{}: {}".format(type(exc).__name__, exc)) if depth > 0: callers = inspect.getinnerframes(exc.__traceback__, context=depth) seen = set() for i, ff in enumerate(callers[-depth:]): frm = ff[0] f_self = frm.f_locals.get("self", None) if isinstance(f_self, ParserElement): if frm.f_code.co_name not in ("parseImpl", "_parseNoCache"): continue if id(f_self) in seen: continue seen.add(id(f_self)) self_type = type(f_self) ret.append( "{}.{} - {}".format( self_type.__module__, self_type.__name__, f_self ) ) elif f_self is not None: self_type = type(f_self) ret.append("{}.{}".format(self_type.__module__, self_type.__name__)) else: code = frm.f_code if code.co_name in ("wrapper", "<module>"): continue ret.append("{}".format(code.co_name)) depth -= 1 if not depth: break return "\n".join(ret) @classmethod def _from_exception(cls, pe): """ internal factory method to simplify creating one type of ParseException from another - avoids having __init__ signature conflicts among subclasses """ return cls(pe.pstr, pe.loc, pe.msg, pe.parserElement) @property def line(self) -> str: """ Return the line of text where the exception occurred. """ return line(self.loc, self.pstr) @property def lineno(self) -> int: """ Return the 1-based line number of text where the exception occurred. """ return lineno(self.loc, self.pstr) @property def col(self) -> int: """ Return the 1-based column on the line of text where the exception occurred. """ return col(self.loc, self.pstr) @property def column(self) -> int: """ Return the 1-based column on the line of text where the exception occurred. """ return col(self.loc, self.pstr) def __str__(self) -> str: if self.pstr: if self.loc >= len(self.pstr): foundstr = ", found end of text" else: # pull out next word at error location found_match = _exception_word_extractor.match(self.pstr, self.loc) if found_match is not None: found = found_match.group(0) else: found = self.pstr[self.loc : self.loc + 1] foundstr = (", found %r" % found).replace(r"\\", "\\") else: foundstr = "" return "{}{} (at char {}), (line:{}, col:{})".format( self.msg, foundstr, self.loc, self.lineno, self.column ) def __repr__(self): return str(self) def mark_input_line(self, marker_string: str = None, , markerString=">!<") -> str: """ Extracts the exception line from the input string, and marks the location of the exception with a special symbol. """ markerString = marker_string if marker_string is not None else markerString line_str = self.line line_column = self.column - 1 if markerString: line_str = "".join( (line_str[:line_column], markerString, line_str[line_column:]) ) return line_str.strip() def explain(self, depth=16) -> str: """ Method to translate the Python internal traceback into a list of the pyparsing expressions that caused the exception to be raised. Parameters: - depth (default=16) - number of levels back in the stack trace to list expression and function names; if None, the full stack trace names will be listed; if 0, only the failing input line, marker, and exception string will be shown Returns a multi-line string listing the ParserElements and/or function names in the exception's stack trace. Example:: expr = pp.Word(pp.nums) 3 try: expr.parse_string("123 456 A789") except pp.ParseException as pe: print(pe.explain(depth=0)) prints:: 123 456 A789 ^ ParseException: Expected W:(0-9), found 'A' (at char 8), (line:1, col:9) Note: the diagnostic output will include string representations of the expressions that failed to parse. These representations will be more helpful if you use `set_name` to give identifiable names to your expressions. Otherwise they will use the default string forms, which may be cryptic to read. Note: pyparsing's default truncation of exception tracebacks may also truncate the stack of expressions that are displayed in the ``explain`` output. To get the full listing of parser expressions, you may have to set ``ParserElement.verbose_stacktrace = True`` """ return self.explain_exception(self, depth) markInputline = mark_input_line class ParseException(ParseBaseException): """ Exception thrown when a parse expression doesn't match the input string Example:: try: Word(nums).set_name("integer").parse_string("ABC") except ParseException as pe: print(pe) print("column: {}".format(pe.column)) prints:: Expected integer (at char 0), (line:1, col:1) column: 1 """ class ParseFatalException(ParseBaseException): """ User-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately """ class ParseSyntaxException(ParseFatalException): """ Just like :class:`ParseFatalException`, but thrown internally when an :class:`ErrorStop<And._ErrorStop>` ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found. """ class RecursiveGrammarException(Exception): """ Exception thrown by :class:`ParserElement.validate` if the grammar could be left-recursive; parser may need to enable left recursion using :class:`ParserElement.enable_left_recursion<ParserElement.enable_left_recursion>` """ def __init__(self, parseElementList): self.parseElementTrace = parseElementList def __str__(self) -> str: return "RecursiveGrammarException: {}".format(self.parseElementTrace)	8.81 KB	2026-01-20 12:58
📄 helpers.py # helpers.py import html.entities import re import typing from . import __diag__ from .core import * from .util import _bslash, _flatten, _escape_regex_range_chars # # global helpers # def delimited_list( expr: Union[str, ParserElement], delim: Union[str, ParserElement] = ",", combine: bool = False, min: typing.Optional[int] = None, max: typing.Optional[int] = None, , allow_trailing_delim: bool = False, ) -> ParserElement: """Helper to define a delimited list of expressions - the delimiter defaults to ','. By default, the list elements and delimiters can have intervening whitespace, and comments, but this can be overridden by passing ``combine=True`` in the constructor. If ``combine`` is set to ``True``, the matching tokens are returned as a single token string, with the delimiters included; otherwise, the matching tokens are returned as a list of tokens, with the delimiters suppressed. If ``allow_trailing_delim`` is set to True, then the list may end with a delimiter. Example:: delimited_list(Word(alphas)).parse_string("aa,bb,cc") # -> ['aa', 'bb', 'cc'] delimited_list(Word(hexnums), delim=':', combine=True).parse_string("AA:BB:CC:DD:EE") # -> ['AA:BB:CC:DD:EE'] """ if isinstance(expr, str_type): expr = ParserElement._literalStringClass(expr) dlName = "{expr} [{delim} {expr}]...{end}".format( expr=str(expr.copy().streamline()), delim=str(delim), end=" [{}]".format(str(delim)) if allow_trailing_delim else "", ) if not combine: delim = Suppress(delim) if min is not None: if min < 1: raise ValueError("min must be greater than 0") min -= 1 if max is not None: if min is not None and max <= min: raise ValueError("max must be greater than, or equal to min") max -= 1 delimited_list_expr = expr + (delim + expr)[min, max] if allow_trailing_delim: delimited_list_expr += Opt(delim) if combine: return Combine(delimited_list_expr).set_name(dlName) else: return delimited_list_expr.set_name(dlName) def counted_array( expr: ParserElement, int_expr: typing.Optional[ParserElement] = None, , intExpr: typing.Optional[ParserElement] = None, ) -> ParserElement: """Helper to define a counted list of expressions. This helper defines a pattern of the form:: integer expr expr expr... where the leading integer tells how many expr expressions follow. The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed. If ``int_expr`` is specified, it should be a pyparsing expression that produces an integer value. Example:: counted_array(Word(alphas)).parse_string('2 ab cd ef') # -> ['ab', 'cd'] # in this parser, the leading integer value is given in binary, # '10' indicating that 2 values are in the array binary_constant = Word('01').set_parse_action(lambda t: int(t[0], 2)) counted_array(Word(alphas), int_expr=binary_constant).parse_string('10 ab cd ef') # -> ['ab', 'cd'] # if other fields must be parsed after the count but before the # list items, give the fields results names and they will # be preserved in the returned ParseResults: count_with_metadata = integer + Word(alphas)("type") typed_array = counted_array(Word(alphanums), int_expr=count_with_metadata)("items") result = typed_array.parse_string("3 bool True True False") print(result.dump()) # prints # ['True', 'True', 'False'] # - items: ['True', 'True', 'False'] # - type: 'bool' """ intExpr = intExpr or int_expr array_expr = Forward() def count_field_parse_action(s, l, t): nonlocal array_expr n = t[0] array_expr <<= (expr * n) if n else Empty() # clear list contents, but keep any named results del t[:] if intExpr is None: intExpr = Word(nums).set_parse_action(lambda t: int(t[0])) else: intExpr = intExpr.copy() intExpr.set_name("arrayLen") intExpr.add_parse_action(count_field_parse_action, call_during_try=True) return (intExpr + array_expr).set_name("(len) " + str(expr) + "...") def match_previous_literal(expr: ParserElement) -> ParserElement: """Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:: first = Word(nums) second = match_previous_literal(first) match_expr = first + ":" + second will match ``"1:1"``, but not ``"1:2"``. Because this matches a previous literal, will also match the leading ``"1:1"`` in ``"1:10"``. If this is not desired, use :class:`match_previous_expr`. Do not use with packrat parsing enabled. """ rep = Forward() def copy_token_to_repeater(s, l, t): if t: if len(t) == 1: rep << t[0] else: # flatten t tokens tflat = _flatten(t.as_list()) rep << And(Literal(tt) for tt in tflat) else: rep << Empty() expr.add_parse_action(copy_token_to_repeater, callDuringTry=True) rep.set_name("(prev) " + str(expr)) return rep def match_previous_expr(expr: ParserElement) -> ParserElement: """Helper to define an expression that is indirectly defined from the tokens matched in a previous expression, that is, it looks for a 'repeat' of a previous expression. For example:: first = Word(nums) second = match_previous_expr(first) match_expr = first + ":" + second will match ``"1:1"``, but not ``"1:2"``. Because this matches by expressions, will not match the leading ``"1:1"`` in ``"1:10"``; the expressions are evaluated first, and then compared, so ``"1"`` is compared with ``"10"``. Do not use with packrat parsing enabled. """ rep = Forward() e2 = expr.copy() rep <<= e2 def copy_token_to_repeater(s, l, t): matchTokens = _flatten(t.as_list()) def must_match_these_tokens(s, l, t): theseTokens = _flatten(t.as_list()) if theseTokens != matchTokens: raise ParseException( s, l, "Expected {}, found{}".format(matchTokens, theseTokens) ) rep.set_parse_action(must_match_these_tokens, callDuringTry=True) expr.add_parse_action(copy_token_to_repeater, callDuringTry=True) rep.set_name("(prev) " + str(expr)) return rep def one_of( strs: Union[typing.Iterable[str], str], caseless: bool = False, use_regex: bool = True, as_keyword: bool = False, , useRegex: bool = True, asKeyword: bool = False, ) -> ParserElement: """Helper to quickly define a set of alternative :class:`Literal` s, and makes sure to do longest-first testing when there is a conflict, regardless of the input order, but returns a :class:`MatchFirst` for best performance. Parameters: - ``strs`` - a string of space-delimited literals, or a collection of string literals - ``caseless`` - treat all literals as caseless - (default= ``False``) - ``use_regex`` - as an optimization, will generate a :class:`Regex` object; otherwise, will generate a :class:`MatchFirst` object (if ``caseless=True`` or ``asKeyword=True``, or if creating a :class:`Regex` raises an exception) - (default= ``True``) - ``as_keyword`` - enforce :class:`Keyword`-style matching on the generated expressions - (default= ``False``) - ``asKeyword`` and ``useRegex`` are retained for pre-PEP8 compatibility, but will be removed in a future release Example:: comp_oper = one_of("< = > <= >= !=") var = Word(alphas) number = Word(nums) term = var \| number comparison_expr = term + comp_oper + term print(comparison_expr.search_string("B = 12 AA=23 B<=AA AA>12")) prints:: [['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']] """ asKeyword = asKeyword or as_keyword useRegex = useRegex and use_regex if ( isinstance(caseless, str_type) and __diag__.warn_on_multiple_string_args_to_oneof ): warnings.warn( "More than one string argument passed to one_of, pass" " choices as a list or space-delimited string", stacklevel=2, ) if caseless: isequal = lambda a, b: a.upper() == b.upper() masks = lambda a, b: b.upper().startswith(a.upper()) parseElementClass = CaselessKeyword if asKeyword else CaselessLiteral else: isequal = lambda a, b: a == b masks = lambda a, b: b.startswith(a) parseElementClass = Keyword if asKeyword else Literal symbols: List[str] = [] if isinstance(strs, str_type): symbols = strs.split() elif isinstance(strs, Iterable): symbols = list(strs) else: raise TypeError("Invalid argument to one_of, expected string or iterable") if not symbols: return NoMatch() # reorder given symbols to take care to avoid masking longer choices with shorter ones # (but only if the given symbols are not just single characters) if any(len(sym) > 1 for sym in symbols): i = 0 while i < len(symbols) - 1: cur = symbols[i] for j, other in enumerate(symbols[i + 1 :]): if isequal(other, cur): del symbols[i + j + 1] break elif masks(cur, other): del symbols[i + j + 1] symbols.insert(i, other) break else: i += 1 if useRegex: re_flags: int = re.IGNORECASE if caseless else 0 try: if all(len(sym) == 1 for sym in symbols): # symbols are just single characters, create range regex pattern patt = "[{}]".format( "".join(_escape_regex_range_chars(sym) for sym in symbols) ) else: patt = "\|".join(re.escape(sym) for sym in symbols) # wrap with \b word break markers if defining as keywords if asKeyword: patt = r"\b(?:{})\b".format(patt) ret = Regex(patt, flags=re_flags).set_name(" \| ".join(symbols)) if caseless: # add parse action to return symbols as specified, not in random # casing as found in input string symbol_map = {sym.lower(): sym for sym in symbols} ret.add_parse_action(lambda s, l, t: symbol_map[t[0].lower()]) return ret except re.error: warnings.warn( "Exception creating Regex for one_of, building MatchFirst", stacklevel=2 ) # last resort, just use MatchFirst return MatchFirst(parseElementClass(sym) for sym in symbols).set_name( " \| ".join(symbols) ) def dict_of(key: ParserElement, value: ParserElement) -> ParserElement: """Helper to easily and clearly define a dictionary by specifying the respective patterns for the key and value. Takes care of defining the :class:`Dict`, :class:`ZeroOrMore`, and :class:`Group` tokens in the proper order. The key pattern can include delimiting markers or punctuation, as long as they are suppressed, thereby leaving the significant key text. The value pattern can include named results, so that the :class:`Dict` results can include named token fields. Example:: text = "shape: SQUARE posn: upper left color: light blue texture: burlap" attr_expr = (label + Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join)) print(attr_expr[1, ...].parse_string(text).dump()) attr_label = label attr_value = Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join) # similar to Dict, but simpler call format result = dict_of(attr_label, attr_value).parse_string(text) print(result.dump()) print(result['shape']) print(result.shape) # object attribute access works too print(result.as_dict()) prints:: [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']] - color: 'light blue' - posn: 'upper left' - shape: 'SQUARE' - texture: 'burlap' SQUARE SQUARE {'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'} """ return Dict(OneOrMore(Group(key + value))) def original_text_for( expr: ParserElement, as_string: bool = True, , asString: bool = True ) -> ParserElement: """Helper to return the original, untokenized text for a given expression. Useful to restore the parsed fields of an HTML start tag into the raw tag text itself, or to revert separate tokens with intervening whitespace back to the original matching input text. By default, returns astring containing the original parsed text. If the optional ``as_string`` argument is passed as ``False``, then the return value is a :class:`ParseResults` containing any results names that were originally matched, and a single token containing the original matched text from the input string. So if the expression passed to :class:`original_text_for` contains expressions with defined results names, you must set ``as_string`` to ``False`` if you want to preserve those results name values. The ``asString`` pre-PEP8 argument is retained for compatibility, but will be removed in a future release. Example:: src = "this is test <b> bold <i>text</i> </b> normal text " for tag in ("b", "i"): opener, closer = make_html_tags(tag) patt = original_text_for(opener + SkipTo(closer) + closer) print(patt.search_string(src)[0]) prints:: ['<b> bold <i>text</i> </b>'] ['<i>text</i>'] """ asString = asString and as_string locMarker = Empty().set_parse_action(lambda s, loc, t: loc) endlocMarker = locMarker.copy() endlocMarker.callPreparse = False matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end") if asString: extractText = lambda s, l, t: s[t._original_start : t._original_end] else: def extractText(s, l, t): t[:] = [s[t.pop("_original_start") : t.pop("_original_end")]] matchExpr.set_parse_action(extractText) matchExpr.ignoreExprs = expr.ignoreExprs matchExpr.suppress_warning(Diagnostics.warn_ungrouped_named_tokens_in_collection) return matchExpr def ungroup(expr: ParserElement) -> ParserElement: """Helper to undo pyparsing's default grouping of And expressions, even if all but one are non-empty. """ return TokenConverter(expr).add_parse_action(lambda t: t[0]) def locatedExpr(expr: ParserElement) -> ParserElement: """ (DEPRECATED - future code should use the Located class) Helper to decorate a returned token with its starting and ending locations in the input string. This helper adds the following results names: - ``locn_start`` - location where matched expression begins - ``locn_end`` - location where matched expression ends - ``value`` - the actual parsed results Be careful if the input text contains ``<TAB>`` characters, you may want to call :class:`ParserElement.parseWithTabs` Example:: wd = Word(alphas) for match in locatedExpr(wd).searchString("ljsdf123lksdjjf123lkkjj1222"): print(match) prints:: [[0, 'ljsdf', 5]] [[8, 'lksdjjf', 15]] [[18, 'lkkjj', 23]] """ locator = Empty().set_parse_action(lambda ss, ll, tt: ll) return Group( locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end") ) def nested_expr( opener: Union[str, ParserElement] = "(", closer: Union[str, ParserElement] = ")", content: typing.Optional[ParserElement] = None, ignore_expr: ParserElement = quoted_string(), , ignoreExpr: ParserElement = quoted_string(), ) -> ParserElement: """Helper method for defining nested lists enclosed in opening and closing delimiters (``"("`` and ``")"`` are the default). Parameters: - ``opener`` - opening character for a nested list (default= ``"("``); can also be a pyparsing expression - ``closer`` - closing character for a nested list (default= ``")"``); can also be a pyparsing expression - ``content`` - expression for items within the nested lists (default= ``None``) - ``ignore_expr`` - expression for ignoring opening and closing delimiters (default= :class:`quoted_string`) - ``ignoreExpr`` - this pre-PEP8 argument is retained for compatibility but will be removed in a future release If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values. Use the ``ignore_expr`` argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quoted_string or a comment expression. Specify multiple expressions using an :class:`Or` or :class:`MatchFirst`. The default is :class:`quoted_string`, but if no expressions are to be ignored, then pass ``None`` for this argument. Example:: data_type = one_of("void int short long char float double") decl_data_type = Combine(data_type + Opt(Word(''))) ident = Word(alphas+'_', alphanums+'_') number = pyparsing_common.number arg = Group(decl_data_type + ident) LPAR, RPAR = map(Suppress, "()") code_body = nested_expr('{', '}', ignore_expr=(quoted_string \| c_style_comment)) c_function = (decl_data_type("type") + ident("name") + LPAR + Opt(delimited_list(arg), [])("args") + RPAR + code_body("body")) c_function.ignore(c_style_comment) source_code = ''' int is_odd(int x) { return (x%2); } int dec_to_hex(char hchar) { if (hchar >= '0' && hchar <= '9') { return (ord(hchar)-ord('0')); } else { return (10+ord(hchar)-ord('A')); } } ''' for func in c_function.search_string(source_code): print("%(name)s (%(type)s) args: %(args)s" % func) prints:: is_odd (int) args: [['int', 'x']] dec_to_hex (int) args: [['char', 'hchar']] """ if ignoreExpr != ignore_expr: ignoreExpr = ignore_expr if ignoreExpr == quoted_string() else ignoreExpr if opener == closer: raise ValueError("opening and closing strings cannot be the same") if content is None: if isinstance(opener, str_type) and isinstance(closer, str_type): if len(opener) == 1 and len(closer) == 1: if ignoreExpr is not None: content = Combine( OneOrMore( ~ignoreExpr + CharsNotIn( opener + closer + ParserElement.DEFAULT_WHITE_CHARS, exact=1, ) ) ).set_parse_action(lambda t: t[0].strip()) else: content = empty.copy() + CharsNotIn( opener + closer + ParserElement.DEFAULT_WHITE_CHARS ).set_parse_action(lambda t: t[0].strip()) else: if ignoreExpr is not None: content = Combine( OneOrMore( ~ignoreExpr + ~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS, exact=1) ) ).set_parse_action(lambda t: t[0].strip()) else: content = Combine( OneOrMore( ~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS, exact=1) ) ).set_parse_action(lambda t: t[0].strip()) else: raise ValueError( "opening and closing arguments must be strings if no content expression is given" ) ret = Forward() if ignoreExpr is not None: ret <<= Group( Suppress(opener) + ZeroOrMore(ignoreExpr \| ret \| content) + Suppress(closer) ) else: ret <<= Group(Suppress(opener) + ZeroOrMore(ret \| content) + Suppress(closer)) ret.set_name("nested %s%s expression" % (opener, closer)) return ret def _makeTags(tagStr, xml, suppress_LT=Suppress("<"), suppress_GT=Suppress(">")): """Internal helper to construct opening and closing tag expressions, given a tag name""" if isinstance(tagStr, str_type): resname = tagStr tagStr = Keyword(tagStr, caseless=not xml) else: resname = tagStr.name tagAttrName = Word(alphas, alphanums + "_-:") if xml: tagAttrValue = dbl_quoted_string.copy().set_parse_action(remove_quotes) openTag = ( suppress_LT + tagStr("tag") + Dict(ZeroOrMore(Group(tagAttrName + Suppress("=") + tagAttrValue))) + Opt("/", default=[False])("empty").set_parse_action( lambda s, l, t: t[0] == "/" ) + suppress_GT ) else: tagAttrValue = quoted_string.copy().set_parse_action(remove_quotes) \| Word( printables, exclude_chars=">" ) openTag = ( suppress_LT + tagStr("tag") + Dict( ZeroOrMore( Group( tagAttrName.set_parse_action(lambda t: t[0].lower()) + Opt(Suppress("=") + tagAttrValue) ) ) ) + Opt("/", default=[False])("empty").set_parse_action( lambda s, l, t: t[0] == "/" ) + suppress_GT ) closeTag = Combine(Literal("</") + tagStr + ">", adjacent=False) openTag.set_name("<%s>" % resname) # add start<tagname> results name in parse action now that ungrouped names are not reported at two levels openTag.add_parse_action( lambda t: t.__setitem__( "start" + "".join(resname.replace(":", " ").title().split()), t.copy() ) ) closeTag = closeTag( "end" + "".join(resname.replace(":", " ").title().split()) ).set_name("</%s>" % resname) openTag.tag = resname closeTag.tag = resname openTag.tag_body = SkipTo(closeTag()) return openTag, closeTag def make_html_tags( tag_str: Union[str, ParserElement] ) -> Tuple[ParserElement, ParserElement]: """Helper to construct opening and closing tag expressions for HTML, given a tag name. Matches tags in either upper or lower case, attributes with namespaces and with quoted or unquoted values. Example:: text = '<td>More info at the <a href="https://github.com/pyparsing/pyparsing/wiki">pyparsing</a> wiki page</td>' # make_html_tags returns pyparsing expressions for the opening and # closing tags as a 2-tuple a, a_end = make_html_tags("A") link_expr = a + SkipTo(a_end)("link_text") + a_end for link in link_expr.search_string(text): # attributes in the <A> tag (like "href" shown here) are # also accessible as named results print(link.link_text, '->', link.href) prints:: pyparsing -> https://github.com/pyparsing/pyparsing/wiki """ return _makeTags(tag_str, False) def make_xml_tags( tag_str: Union[str, ParserElement] ) -> Tuple[ParserElement, ParserElement]: """Helper to construct opening and closing tag expressions for XML, given a tag name. Matches tags only in the given upper/lower case. Example: similar to :class:`make_html_tags` """ return _makeTags(tag_str, True) any_open_tag: ParserElement any_close_tag: ParserElement any_open_tag, any_close_tag = make_html_tags( Word(alphas, alphanums + "_:").set_name("any tag") ) _htmlEntityMap = {k.rstrip(";"): v for k, v in html.entities.html5.items()} common_html_entity = Regex("&(?P<entity>" + "\|".join(_htmlEntityMap) + ");").set_name( "common HTML entity" ) def replace_html_entity(t): """Helper parser action to replace common HTML entities with their special characters""" return _htmlEntityMap.get(t.entity) class OpAssoc(Enum): LEFT = 1 RIGHT = 2 InfixNotationOperatorArgType = Union[ ParserElement, str, Tuple[Union[ParserElement, str], Union[ParserElement, str]] ] InfixNotationOperatorSpec = Union[ Tuple[ InfixNotationOperatorArgType, int, OpAssoc, typing.Optional[ParseAction], ], Tuple[ InfixNotationOperatorArgType, int, OpAssoc, ], ] def infix_notation( base_expr: ParserElement, op_list: List[InfixNotationOperatorSpec], lpar: Union[str, ParserElement] = Suppress("("), rpar: Union[str, ParserElement] = Suppress(")"), ) -> ParserElement: """Helper method for constructing grammars of expressions made up of operators working in a precedence hierarchy. Operators may be unary or binary, left- or right-associative. Parse actions can also be attached to operator expressions. The generated parser will also recognize the use of parentheses to override operator precedences (see example below). Note: if you define a deep operator list, you may see performance issues when using infix_notation. See :class:`ParserElement.enable_packrat` for a mechanism to potentially improve your parser performance. Parameters: - ``base_expr`` - expression representing the most basic operand to be used in the expression - ``op_list`` - list of tuples, one for each operator precedence level in the expression grammar; each tuple is of the form ``(op_expr, num_operands, right_left_assoc, (optional)parse_action)``, where: - ``op_expr`` is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if ``num_operands`` is 3, ``op_expr`` is a tuple of two expressions, for the two operators separating the 3 terms - ``num_operands`` is the number of terms for this operator (must be 1, 2, or 3) - ``right_left_assoc`` is the indicator whether the operator is right or left associative, using the pyparsing-defined constants ``OpAssoc.RIGHT`` and ``OpAssoc.LEFT``. - ``parse_action`` is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted); if the parse action is passed a tuple or list of functions, this is equivalent to calling ``set_parse_action(fn)`` (:class:`ParserElement.set_parse_action`) - ``lpar`` - expression for matching left-parentheses; if passed as a str, then will be parsed as Suppress(lpar). If lpar is passed as an expression (such as ``Literal('(')``), then it will be kept in the parsed results, and grouped with them. (default= ``Suppress('(')``) - ``rpar`` - expression for matching right-parentheses; if passed as a str, then will be parsed as Suppress(rpar). If rpar is passed as an expression (such as ``Literal(')')``), then it will be kept in the parsed results, and grouped with them. (default= ``Suppress(')')``) Example:: # simple example of four-function arithmetic with ints and # variable names integer = pyparsing_common.signed_integer varname = pyparsing_common.identifier arith_expr = infix_notation(integer \| varname, [ ('-', 1, OpAssoc.RIGHT), (one_of(' /'), 2, OpAssoc.LEFT), (one_of('+ -'), 2, OpAssoc.LEFT), ]) arith_expr.run_tests(''' 5+36 (5+3)6 -2--11 ''', full_dump=False) prints:: 5+36 [[5, '+', [3, '', 6]]] (5+3)6 [[[5, '+', 3], '', 6]] -2--11 [[['-', 2], '-', ['-', 11]]] """ # captive version of FollowedBy that does not do parse actions or capture results names class _FB(FollowedBy): def parseImpl(self, instring, loc, doActions=True): self.expr.try_parse(instring, loc) return loc, [] _FB.__name__ = "FollowedBy>" ret = Forward() if isinstance(lpar, str): lpar = Suppress(lpar) if isinstance(rpar, str): rpar = Suppress(rpar) # if lpar and rpar are not suppressed, wrap in group if not (isinstance(rpar, Suppress) and isinstance(rpar, Suppress)): lastExpr = base_expr \| Group(lpar + ret + rpar) else: lastExpr = base_expr \| (lpar + ret + rpar) for i, operDef in enumerate(op_list): opExpr, arity, rightLeftAssoc, pa = (operDef + (None,))[:4] if isinstance(opExpr, str_type): opExpr = ParserElement._literalStringClass(opExpr) if arity == 3: if not isinstance(opExpr, (tuple, list)) or len(opExpr) != 2: raise ValueError( "if numterms=3, opExpr must be a tuple or list of two expressions" ) opExpr1, opExpr2 = opExpr term_name = "{}{} term".format(opExpr1, opExpr2) else: term_name = "{} term".format(opExpr) if not 1 <= arity <= 3: raise ValueError("operator must be unary (1), binary (2), or ternary (3)") if rightLeftAssoc not in (OpAssoc.LEFT, OpAssoc.RIGHT): raise ValueError("operator must indicate right or left associativity") thisExpr: Forward = Forward().set_name(term_name) if rightLeftAssoc is OpAssoc.LEFT: if arity == 1: matchExpr = _FB(lastExpr + opExpr) + Group(lastExpr + opExpr[1, ...]) elif arity == 2: if opExpr is not None: matchExpr = _FB(lastExpr + opExpr + lastExpr) + Group( lastExpr + (opExpr + lastExpr)[1, ...] ) else: matchExpr = _FB(lastExpr + lastExpr) + Group(lastExpr[2, ...]) elif arity == 3: matchExpr = _FB( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr ) + Group(lastExpr + OneOrMore(opExpr1 + lastExpr + opExpr2 + lastExpr)) elif rightLeftAssoc is OpAssoc.RIGHT: if arity == 1: # try to avoid LR with this extra test if not isinstance(opExpr, Opt): opExpr = Opt(opExpr) matchExpr = _FB(opExpr.expr + thisExpr) + Group(opExpr + thisExpr) elif arity == 2: if opExpr is not None: matchExpr = _FB(lastExpr + opExpr + thisExpr) + Group( lastExpr + (opExpr + thisExpr)[1, ...] ) else: matchExpr = _FB(lastExpr + thisExpr) + Group( lastExpr + thisExpr[1, ...] ) elif arity == 3: matchExpr = _FB( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr ) + Group(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) if pa: if isinstance(pa, (tuple, list)): matchExpr.set_parse_action(pa) else: matchExpr.set_parse_action(pa) thisExpr <<= (matchExpr \| lastExpr).setName(term_name) lastExpr = thisExpr ret <<= lastExpr return ret def indentedBlock(blockStatementExpr, indentStack, indent=True, backup_stacks=[]): """ (DEPRECATED - use IndentedBlock class instead) Helper method for defining space-delimited indentation blocks, such as those used to define block statements in Python source code. Parameters: - ``blockStatementExpr`` - expression defining syntax of statement that is repeated within the indented block - ``indentStack`` - list created by caller to manage indentation stack (multiple ``statementWithIndentedBlock`` expressions within a single grammar should share a common ``indentStack``) - ``indent`` - boolean indicating whether block must be indented beyond the current level; set to ``False`` for block of left-most statements (default= ``True``) A valid block must contain at least one ``blockStatement``. (Note that indentedBlock uses internal parse actions which make it incompatible with packrat parsing.) Example:: data = ''' def A(z): A1 B = 100 G = A2 A2 A3 B def BB(a,b,c): BB1 def BBA(): bba1 bba2 bba3 C D def spam(x,y): def eggs(z): pass ''' indentStack = [1] stmt = Forward() identifier = Word(alphas, alphanums) funcDecl = ("def" + identifier + Group("(" + Opt(delimitedList(identifier)) + ")") + ":") func_body = indentedBlock(stmt, indentStack) funcDef = Group(funcDecl + func_body) rvalue = Forward() funcCall = Group(identifier + "(" + Opt(delimitedList(rvalue)) + ")") rvalue << (funcCall \| identifier \| Word(nums)) assignment = Group(identifier + "=" + rvalue) stmt << (funcDef \| assignment \| identifier) module_body = stmt[1, ...] parseTree = module_body.parseString(data) parseTree.pprint() prints:: [['def', 'A', ['(', 'z', ')'], ':', [['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]], 'B', ['def', 'BB', ['(', 'a', 'b', 'c', ')'], ':', [['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]], 'C', 'D', ['def', 'spam', ['(', 'x', 'y', ')'], ':', [[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]] """ backup_stacks.append(indentStack[:]) def reset_stack(): indentStack[:] = backup_stacks[-1] def checkPeerIndent(s, l, t): if l >= len(s): return curCol = col(l, s) if curCol != indentStack[-1]: if curCol > indentStack[-1]: raise ParseException(s, l, "illegal nesting") raise ParseException(s, l, "not a peer entry") def checkSubIndent(s, l, t): curCol = col(l, s) if curCol > indentStack[-1]: indentStack.append(curCol) else: raise ParseException(s, l, "not a subentry") def checkUnindent(s, l, t): if l >= len(s): return curCol = col(l, s) if not (indentStack and curCol in indentStack): raise ParseException(s, l, "not an unindent") if curCol < indentStack[-1]: indentStack.pop() NL = OneOrMore(LineEnd().set_whitespace_chars("\t ").suppress()) INDENT = (Empty() + Empty().set_parse_action(checkSubIndent)).set_name("INDENT") PEER = Empty().set_parse_action(checkPeerIndent).set_name("") UNDENT = Empty().set_parse_action(checkUnindent).set_name("UNINDENT") if indent: smExpr = Group( Opt(NL) + INDENT + OneOrMore(PEER + Group(blockStatementExpr) + Opt(NL)) + UNDENT ) else: smExpr = Group( Opt(NL) + OneOrMore(PEER + Group(blockStatementExpr) + Opt(NL)) + Opt(UNDENT) ) # add a parse action to remove backup_stack from list of backups smExpr.add_parse_action( lambda: backup_stacks.pop(-1) and None if backup_stacks else None ) smExpr.set_fail_action(lambda a, b, c, d: reset_stack()) blockStatementExpr.ignore(_bslash + LineEnd()) return smExpr.set_name("indented block") # it's easy to get these comment structures wrong - they're very common, so may as well make them available c_style_comment = Combine(Regex(r"/\(?:[^]\|\(?!/))") + "/").set_name( "C style comment" ) "Comment of the form ``/* ... /``" html_comment = Regex(r"<!--[\s\S]?-->").set_name("HTML comment") "Comment of the form ``<!-- ... -->``" rest_of_line = Regex(r".").leave_whitespace().set_name("rest of line") dbl_slash_comment = Regex(r"//(?:\\\n\|[^\n])").set_name("// comment") "Comment of the form ``// ... (to end of line)``" cpp_style_comment = Combine( Regex(r"/\(?:[^]\|\(?!/))") + "/" \| dbl_slash_comment ).set_name("C++ style comment") "Comment of either form :class:`c_style_comment` or :class:`dbl_slash_comment`" java_style_comment = cpp_style_comment "Same as :class:`cpp_style_comment`" python_style_comment = Regex(r"#.").set_name("Python style comment") "Comment of the form ``# ... (to end of line)``" # build list of built-in expressions, for future reference if a global default value # gets updated _builtin_exprs: List[ParserElement] = [ v for v in vars().values() if isinstance(v, ParserElement) ] # pre-PEP8 compatible names delimitedList = delimited_list countedArray = counted_array matchPreviousLiteral = match_previous_literal matchPreviousExpr = match_previous_expr oneOf = one_of dictOf = dict_of originalTextFor = original_text_for nestedExpr = nested_expr makeHTMLTags = make_html_tags makeXMLTags = make_xml_tags anyOpenTag, anyCloseTag = any_open_tag, any_close_tag commonHTMLEntity = common_html_entity replaceHTMLEntity = replace_html_entity opAssoc = OpAssoc infixNotation = infix_notation cStyleComment = c_style_comment htmlComment = html_comment restOfLine = rest_of_line dblSlashComment = dbl_slash_comment cppStyleComment = cpp_style_comment javaStyleComment = java_style_comment pythonStyleComment = python_style_comment	38.21 KB	2026-01-20 12:58
📄 py.typed	0 B	2026-01-20 12:58
📄 results.py # results.py from collections.abc import MutableMapping, Mapping, MutableSequence, Iterator import pprint from weakref import ref as wkref from typing import Tuple, Any str_type: Tuple[type, ...] = (str, bytes) _generator_type = type((_ for _ in ())) class _ParseResultsWithOffset: __slots__ = ["tup"] def __init__(self, p1, p2): self.tup = (p1, p2) def __getitem__(self, i): return self.tup[i] def __getstate__(self): return self.tup def __setstate__(self, args): self.tup = args[0] class ParseResults: """Structured parse results, to provide multiple means of access to the parsed data: - as a list (``len(results)``) - by list index (``results[0], results[1]``, etc.) - by attribute (``results.<results_name>`` - see :class:`ParserElement.set_results_name`) Example:: integer = Word(nums) date_str = (integer.set_results_name("year") + '/' + integer.set_results_name("month") + '/' + integer.set_results_name("day")) # equivalent form: # date_str = (integer("year") + '/' # + integer("month") + '/' # + integer("day")) # parse_string returns a ParseResults object result = date_str.parse_string("1999/12/31") def test(s, fn=repr): print("{} -> {}".format(s, fn(eval(s)))) test("list(result)") test("result[0]") test("result['month']") test("result.day") test("'month' in result") test("'minutes' in result") test("result.dump()", str) prints:: list(result) -> ['1999', '/', '12', '/', '31'] result[0] -> '1999' result['month'] -> '12' result.day -> '31' 'month' in result -> True 'minutes' in result -> False result.dump() -> ['1999', '/', '12', '/', '31'] - day: '31' - month: '12' - year: '1999' """ _null_values: Tuple[Any, ...] = (None, [], "", ()) __slots__ = [ "_name", "_parent", "_all_names", "_modal", "_toklist", "_tokdict", "__weakref__", ] class List(list): """ Simple wrapper class to distinguish parsed list results that should be preserved as actual Python lists, instead of being converted to :class:`ParseResults`: LBRACK, RBRACK = map(pp.Suppress, "[]") element = pp.Forward() item = ppc.integer element_list = LBRACK + pp.delimited_list(element) + RBRACK # add parse actions to convert from ParseResults to actual Python collection types def as_python_list(t): return pp.ParseResults.List(t.as_list()) element_list.add_parse_action(as_python_list) element <<= item \| element_list element.run_tests(''' 100 [2,3,4] [[2, 1],3,4] [(2, 1),3,4] (2,3,4) ''', post_parse=lambda s, r: (r[0], type(r[0]))) prints: 100 (100, <class 'int'>) [2,3,4] ([2, 3, 4], <class 'list'>) [[2, 1],3,4] ([[2, 1], 3, 4], <class 'list'>) (Used internally by :class:`Group` when `aslist=True`.) """ def __new__(cls, contained=None): if contained is None: contained = [] if not isinstance(contained, list): raise TypeError( "{} may only be constructed with a list," " not {}".format(cls.__name__, type(contained).__name__) ) return list.__new__(cls) def __new__(cls, toklist=None, name=None, kwargs): if isinstance(toklist, ParseResults): return toklist self = object.__new__(cls) self._name = None self._parent = None self._all_names = set() if toklist is None: self._toklist = [] elif isinstance(toklist, (list, _generator_type)): self._toklist = ( [toklist[:]] if isinstance(toklist, ParseResults.List) else list(toklist) ) else: self._toklist = [toklist] self._tokdict = dict() return self # Performance tuning: we construct a lot* of these, so keep this # constructor as small and fast as possible def __init__( self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance ): self._modal = modal if name is not None and name != "": if isinstance(name, int): name = str(name) if not modal: self._all_names = {name} self._name = name if toklist not in self._null_values: if isinstance(toklist, (str_type, type)): toklist = [toklist] if asList: if isinstance(toklist, ParseResults): self[name] = _ParseResultsWithOffset( ParseResults(toklist._toklist), 0 ) else: self[name] = _ParseResultsWithOffset( ParseResults(toklist[0]), 0 ) self[name]._name = name else: try: self[name] = toklist[0] except (KeyError, TypeError, IndexError): if toklist is not self: self[name] = toklist else: self._name = name def __getitem__(self, i): if isinstance(i, (int, slice)): return self._toklist[i] else: if i not in self._all_names: return self._tokdict[i][-1][0] else: return ParseResults([v[0] for v in self._tokdict[i]]) def __setitem__(self, k, v, isinstance=isinstance): if isinstance(v, _ParseResultsWithOffset): self._tokdict[k] = self._tokdict.get(k, list()) + [v] sub = v[0] elif isinstance(k, (int, slice)): self._toklist[k] = v sub = v else: self._tokdict[k] = self._tokdict.get(k, list()) + [ _ParseResultsWithOffset(v, 0) ] sub = v if isinstance(sub, ParseResults): sub._parent = wkref(self) def __delitem__(self, i): if isinstance(i, (int, slice)): mylen = len(self._toklist) del self._toklist[i] # convert int to slice if isinstance(i, int): if i < 0: i += mylen i = slice(i, i + 1) # get removed indices removed = list(range(i.indices(mylen))) removed.reverse() # fixup indices in token dictionary for name, occurrences in self._tokdict.items(): for j in removed: for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset( value, position - (position > j) ) else: del self._tokdict[i] def __contains__(self, k) -> bool: return k in self._tokdict def __len__(self) -> int: return len(self._toklist) def __bool__(self) -> bool: return not not (self._toklist or self._tokdict) def __iter__(self) -> Iterator: return iter(self._toklist) def __reversed__(self) -> Iterator: return iter(self._toklist[::-1]) def keys(self): return iter(self._tokdict) def values(self): return (self[k] for k in self.keys()) def items(self): return ((k, self[k]) for k in self.keys()) def haskeys(self) -> bool: """ Since ``keys()`` returns an iterator, this method is helpful in bypassing code that looks for the existence of any defined results names.""" return bool(self._tokdict) def pop(self, args, *kwargs): """ Removes and returns item at specified index (default= ``last``). Supports both ``list`` and ``dict`` semantics for ``pop()``. If passed no argument or an integer argument, it will use ``list`` semantics and pop tokens from the list of parsed tokens. If passed a non-integer argument (most likely a string), it will use ``dict`` semantics and pop the corresponding value from any defined results names. A second default return value argument is supported, just as in ``dict.pop()``. Example:: numlist = Word(nums)[...] print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321'] def remove_first(tokens): tokens.pop(0) numlist.add_parse_action(remove_first) print(numlist.parse_string("0 123 321")) # -> ['123', '321'] label = Word(alphas) patt = label("LABEL") + Word(nums)[1, ...] print(patt.parse_string("AAB 123 321").dump()) # Use pop() in a parse action to remove named result (note that corresponding value is not # removed from list form of results) def remove_LABEL(tokens): tokens.pop("LABEL") return tokens patt.add_parse_action(remove_LABEL) print(patt.parse_string("AAB 123 321").dump()) prints:: ['AAB', '123', '321'] - LABEL: 'AAB' ['AAB', '123', '321'] """ if not args: args = [-1] for k, v in kwargs.items(): if k == "default": args = (args[0], v) else: raise TypeError( "pop() got an unexpected keyword argument {!r}".format(k) ) if isinstance(args[0], int) or len(args) == 1 or args[0] in self: index = args[0] ret = self[index] del self[index] return ret else: defaultvalue = args[1] return defaultvalue def get(self, key, default_value=None): """ Returns named result matching the given key, or if there is no such name, then returns the given ``default_value`` or ``None`` if no ``default_value`` is specified. Similar to ``dict.get()``. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parse_string("1999/12/31") print(result.get("year")) # -> '1999' print(result.get("hour", "not specified")) # -> 'not specified' print(result.get("hour")) # -> None """ if key in self: return self[key] else: return default_value def insert(self, index, ins_string): """ Inserts new element at location index in the list of parsed tokens. Similar to ``list.insert()``. Example:: numlist = Word(nums)[...] print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321'] # use a parse action to insert the parse location in the front of the parsed results def insert_locn(locn, tokens): tokens.insert(0, locn) numlist.add_parse_action(insert_locn) print(numlist.parse_string("0 123 321")) # -> [0, '0', '123', '321'] """ self._toklist.insert(index, ins_string) # fixup indices in token dictionary for name, occurrences in self._tokdict.items(): for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset( value, position + (position > index) ) def append(self, item): """ Add single element to end of ``ParseResults`` list of elements. Example:: numlist = Word(nums)[...] print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321'] # use a parse action to compute the sum of the parsed integers, and add it to the end def append_sum(tokens): tokens.append(sum(map(int, tokens))) numlist.add_parse_action(append_sum) print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321', 444] """ self._toklist.append(item) def extend(self, itemseq): """ Add sequence of elements to end of ``ParseResults`` list of elements. Example:: patt = Word(alphas)[1, ...] # use a parse action to append the reverse of the matched strings, to make a palindrome def make_palindrome(tokens): tokens.extend(reversed([t[::-1] for t in tokens])) return ''.join(tokens) patt.add_parse_action(make_palindrome) print(patt.parse_string("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl' """ if isinstance(itemseq, ParseResults): self.__iadd__(itemseq) else: self._toklist.extend(itemseq) def clear(self): """ Clear all elements and results names. """ del self._toklist[:] self._tokdict.clear() def __getattr__(self, name): try: return self[name] except KeyError: if name.startswith("__"): raise AttributeError(name) return "" def __add__(self, other) -> "ParseResults": ret = self.copy() ret += other return ret def __iadd__(self, other) -> "ParseResults": if other._tokdict: offset = len(self._toklist) addoffset = lambda a: offset if a < 0 else a + offset otheritems = other._tokdict.items() otherdictitems = [ (k, _ParseResultsWithOffset(v[0], addoffset(v[1]))) for k, vlist in otheritems for v in vlist ] for k, v in otherdictitems: self[k] = v if isinstance(v[0], ParseResults): v[0]._parent = wkref(self) self._toklist += other._toklist self._all_names \|= other._all_names return self def __radd__(self, other) -> "ParseResults": if isinstance(other, int) and other == 0: # useful for merging many ParseResults using sum() builtin return self.copy() else: # this may raise a TypeError - so be it return other + self def __repr__(self) -> str: return "{}({!r}, {})".format(type(self).__name__, self._toklist, self.as_dict()) def __str__(self) -> str: return ( "[" + ", ".join( [ str(i) if isinstance(i, ParseResults) else repr(i) for i in self._toklist ] ) + "]" ) def _asStringList(self, sep=""): out = [] for item in self._toklist: if out and sep: out.append(sep) if isinstance(item, ParseResults): out += item._asStringList() else: out.append(str(item)) return out def as_list(self) -> list: """ Returns the parse results as a nested list of matching tokens, all converted to strings. Example:: patt = Word(alphas)[1, ...] result = patt.parse_string("sldkj lsdkj sldkj") # even though the result prints in string-like form, it is actually a pyparsing ParseResults print(type(result), result) # -> <class 'pyparsing.ParseResults'> ['sldkj', 'lsdkj', 'sldkj'] # Use as_list() to create an actual list result_list = result.as_list() print(type(result_list), result_list) # -> <class 'list'> ['sldkj', 'lsdkj', 'sldkj'] """ return [ res.as_list() if isinstance(res, ParseResults) else res for res in self._toklist ] def as_dict(self) -> dict: """ Returns the named parse results as a nested dictionary. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parse_string('12/31/1999') print(type(result), repr(result)) # -> <class 'pyparsing.ParseResults'> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]}) result_dict = result.as_dict() print(type(result_dict), repr(result_dict)) # -> <class 'dict'> {'day': '1999', 'year': '12', 'month': '31'} # even though a ParseResults supports dict-like access, sometime you just need to have a dict import json print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable print(json.dumps(result.as_dict())) # -> {"month": "31", "day": "1999", "year": "12"} """ def to_item(obj): if isinstance(obj, ParseResults): return obj.as_dict() if obj.haskeys() else [to_item(v) for v in obj] else: return obj return dict((k, to_item(v)) for k, v in self.items()) def copy(self) -> "ParseResults": """ Returns a new copy of a :class:`ParseResults` object. """ ret = ParseResults(self._toklist) ret._tokdict = self._tokdict.copy() ret._parent = self._parent ret._all_names \|= self._all_names ret._name = self._name return ret def get_name(self): r""" Returns the results name for this token expression. Useful when several different expressions might match at a particular location. Example:: integer = Word(nums) ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d") house_number_expr = Suppress('#') + Word(nums, alphanums) user_data = (Group(house_number_expr)("house_number") \| Group(ssn_expr)("ssn") \| Group(integer)("age")) user_info = user_data[1, ...] result = user_info.parse_string("22 111-22-3333 #221B") for item in result: print(item.get_name(), ':', item[0]) prints:: age : 22 ssn : 111-22-3333 house_number : 221B """ if self._name: return self._name elif self._parent: par = self._parent() def find_in_parent(sub): return next( ( k for k, vlist in par._tokdict.items() for v, loc in vlist if sub is v ), None, ) return find_in_parent(self) if par else None elif ( len(self) == 1 and len(self._tokdict) == 1 and next(iter(self._tokdict.values()))[0][1] in (0, -1) ): return next(iter(self._tokdict.keys())) else: return None def dump(self, indent="", full=True, include_list=True, _depth=0) -> str: """ Diagnostic method for listing out the contents of a :class:`ParseResults`. Accepts an optional ``indent`` argument so that this string can be embedded in a nested display of other data. Example:: integer = Word(nums) date_str = integer("year") + '/' + integer("month") + '/' + integer("day") result = date_str.parse_string('1999/12/31') print(result.dump()) prints:: ['1999', '/', '12', '/', '31'] - day: '31' - month: '12' - year: '1999' """ out = [] NL = "\n" out.append(indent + str(self.as_list()) if include_list else "") if full: if self.haskeys(): items = sorted((str(k), v) for k, v in self.items()) for k, v in items: if out: out.append(NL) out.append("{}{}- {}: ".format(indent, (" " _depth), k)) if isinstance(v, ParseResults): if v: out.append( v.dump( indent=indent, full=full, include_list=include_list, _depth=_depth + 1, ) ) else: out.append(str(v)) else: out.append(repr(v)) if any(isinstance(vv, ParseResults) for vv in self): v = self for i, vv in enumerate(v): if isinstance(vv, ParseResults): out.append( "\n{}{}[{}]:\n{}{}{}".format( indent, (" " * (_depth)), i, indent, (" " * (_depth + 1)), vv.dump( indent=indent, full=full, include_list=include_list, _depth=_depth + 1, ), ) ) else: out.append( "\n%s%s[%d]:\n%s%s%s" % ( indent, (" " * (_depth)), i, indent, (" " * (_depth + 1)), str(vv), ) ) return "".join(out) def pprint(self, args, kwargs): """ Pretty-printer for parsed results as a list, using the `pprint <https://docs.python.org/3/library/pprint.html>`_ module. Accepts additional positional or keyword args as defined for `pprint.pprint <https://docs.python.org/3/library/pprint.html#pprint.pprint>`_ . Example:: ident = Word(alphas, alphanums) num = Word(nums) func = Forward() term = ident \| num \| Group('(' + func + ')') func <<= ident + Group(Optional(delimited_list(term))) result = func.parse_string("fna a,b,(fnb c,d,200),100") result.pprint(width=40) prints:: ['fna', ['a', 'b', ['(', 'fnb', ['c', 'd', '200'], ')'], '100']] """ pprint.pprint(self.as_list(), args, **kwargs) # add support for pickle protocol def __getstate__(self): return ( self._toklist, ( self._tokdict.copy(), self._parent is not None and self._parent() or None, self._all_names, self._name, ), ) def __setstate__(self, state): self._toklist, (self._tokdict, par, inAccumNames, self._name) = state self._all_names = set(inAccumNames) if par is not None: self._parent = wkref(par) else: self._parent = None def __getnewargs__(self): return self._toklist, self._name def __dir__(self): return dir(type(self)) + list(self.keys()) @classmethod def from_dict(cls, other, name=None) -> "ParseResults": """ Helper classmethod to construct a ``ParseResults`` from a ``dict``, preserving the name-value relations as results names. If an optional ``name`` argument is given, a nested ``ParseResults`` will be returned. """ def is_iterable(obj): try: iter(obj) except Exception: return False else: return not isinstance(obj, str_type) ret = cls([]) for k, v in other.items(): if isinstance(v, Mapping): ret += cls.from_dict(v, name=k) else: ret += cls([v], name=k, asList=is_iterable(v)) if name is not None: ret = cls([ret], name=name) return ret asList = as_list asDict = as_dict getName = get_name MutableMapping.register(ParseResults) MutableSequence.register(ParseResults)	24.75 KB	2026-01-20 12:58
📄 testing.py # testing.py from contextlib import contextmanager import typing from .core import ( ParserElement, ParseException, Keyword, __diag__, __compat__, ) class pyparsing_test: """ namespace class for classes useful in writing unit tests """ class reset_pyparsing_context: """ Context manager to be used when writing unit tests that modify pyparsing config values: - packrat parsing - bounded recursion parsing - default whitespace characters. - default keyword characters - literal string auto-conversion class - __diag__ settings Example:: with reset_pyparsing_context(): # test that literals used to construct a grammar are automatically suppressed ParserElement.inlineLiteralsUsing(Suppress) term = Word(alphas) \| Word(nums) group = Group('(' + term[...] + ')') # assert that the '()' characters are not included in the parsed tokens self.assertParseAndCheckList(group, "(abc 123 def)", ['abc', '123', 'def']) # after exiting context manager, literals are converted to Literal expressions again """ def __init__(self): self._save_context = {} def save(self): self._save_context["default_whitespace"] = ParserElement.DEFAULT_WHITE_CHARS self._save_context["default_keyword_chars"] = Keyword.DEFAULT_KEYWORD_CHARS self._save_context[ "literal_string_class" ] = ParserElement._literalStringClass self._save_context["verbose_stacktrace"] = ParserElement.verbose_stacktrace self._save_context["packrat_enabled"] = ParserElement._packratEnabled if ParserElement._packratEnabled: self._save_context[ "packrat_cache_size" ] = ParserElement.packrat_cache.size else: self._save_context["packrat_cache_size"] = None self._save_context["packrat_parse"] = ParserElement._parse self._save_context[ "recursion_enabled" ] = ParserElement._left_recursion_enabled self._save_context["__diag__"] = { name: getattr(__diag__, name) for name in __diag__._all_names } self._save_context["__compat__"] = { "collect_all_And_tokens": __compat__.collect_all_And_tokens } return self def restore(self): # reset pyparsing global state if ( ParserElement.DEFAULT_WHITE_CHARS != self._save_context["default_whitespace"] ): ParserElement.set_default_whitespace_chars( self._save_context["default_whitespace"] ) ParserElement.verbose_stacktrace = self._save_context["verbose_stacktrace"] Keyword.DEFAULT_KEYWORD_CHARS = self._save_context["default_keyword_chars"] ParserElement.inlineLiteralsUsing( self._save_context["literal_string_class"] ) for name, value in self._save_context["__diag__"].items(): (__diag__.enable if value else __diag__.disable)(name) ParserElement._packratEnabled = False if self._save_context["packrat_enabled"]: ParserElement.enable_packrat(self._save_context["packrat_cache_size"]) else: ParserElement._parse = self._save_context["packrat_parse"] ParserElement._left_recursion_enabled = self._save_context[ "recursion_enabled" ] __compat__.collect_all_And_tokens = self._save_context["__compat__"] return self def copy(self): ret = type(self)() ret._save_context.update(self._save_context) return ret def __enter__(self): return self.save() def __exit__(self, args): self.restore() class TestParseResultsAsserts: """ A mixin class to add parse results assertion methods to normal unittest.TestCase classes. """ def assertParseResultsEquals( self, result, expected_list=None, expected_dict=None, msg=None ): """ Unit test assertion to compare a :class:`ParseResults` object with an optional ``expected_list``, and compare any defined results names with an optional ``expected_dict``. """ if expected_list is not None: self.assertEqual(expected_list, result.as_list(), msg=msg) if expected_dict is not None: self.assertEqual(expected_dict, result.as_dict(), msg=msg) def assertParseAndCheckList( self, expr, test_string, expected_list, msg=None, verbose=True ): """ Convenience wrapper assert to test a parser element and input string, and assert that the resulting ``ParseResults.asList()`` is equal to the ``expected_list``. """ result = expr.parse_string(test_string, parse_all=True) if verbose: print(result.dump()) else: print(result.as_list()) self.assertParseResultsEquals(result, expected_list=expected_list, msg=msg) def assertParseAndCheckDict( self, expr, test_string, expected_dict, msg=None, verbose=True ): """ Convenience wrapper assert to test a parser element and input string, and assert that the resulting ``ParseResults.asDict()`` is equal to the ``expected_dict``. """ result = expr.parse_string(test_string, parseAll=True) if verbose: print(result.dump()) else: print(result.as_list()) self.assertParseResultsEquals(result, expected_dict=expected_dict, msg=msg) def assertRunTestResults( self, run_tests_report, expected_parse_results=None, msg=None ): """ Unit test assertion to evaluate output of ``ParserElement.runTests()``. If a list of list-dict tuples is given as the ``expected_parse_results`` argument, then these are zipped with the report tuples returned by ``runTests`` and evaluated using ``assertParseResultsEquals``. Finally, asserts that the overall ``runTests()`` success value is ``True``. :param run_tests_report: tuple(bool, [tuple(str, ParseResults or Exception)]) returned from runTests :param expected_parse_results (optional): [tuple(str, list, dict, Exception)] """ run_test_success, run_test_results = run_tests_report if expected_parse_results is not None: merged = [ (rpt, expected) for rpt, expected in zip(run_test_results, expected_parse_results) ] for test_string, result, expected in merged: # expected should be a tuple containing a list and/or a dict or an exception, # and optional failure message string # an empty tuple will skip any result validation fail_msg = next( (exp for exp in expected if isinstance(exp, str)), None ) expected_exception = next( ( exp for exp in expected if isinstance(exp, type) and issubclass(exp, Exception) ), None, ) if expected_exception is not None: with self.assertRaises( expected_exception=expected_exception, msg=fail_msg or msg ): if isinstance(result, Exception): raise result else: expected_list = next( (exp for exp in expected if isinstance(exp, list)), None ) expected_dict = next( (exp for exp in expected if isinstance(exp, dict)), None ) if (expected_list, expected_dict) != (None, None): self.assertParseResultsEquals( result, expected_list=expected_list, expected_dict=expected_dict, msg=fail_msg or msg, ) else: # warning here maybe? print("no validation for {!r}".format(test_string)) # do this last, in case some specific test results can be reported instead self.assertTrue( run_test_success, msg=msg if msg is not None else "failed runTests" ) @contextmanager def assertRaisesParseException(self, exc_type=ParseException, msg=None): with self.assertRaises(exc_type, msg=msg): yield @staticmethod def with_line_numbers( s: str, start_line: typing.Optional[int] = None, end_line: typing.Optional[int] = None, expand_tabs: bool = True, eol_mark: str = "\|", mark_spaces: typing.Optional[str] = None, mark_control: typing.Optional[str] = None, ) -> str: """ Helpful method for debugging a parser - prints a string with line and column numbers. (Line and column numbers are 1-based.) :param s: tuple(bool, str - string to be printed with line and column numbers :param start_line: int - (optional) starting line number in s to print (default=1) :param end_line: int - (optional) ending line number in s to print (default=len(s)) :param expand_tabs: bool - (optional) expand tabs to spaces, to match the pyparsing default :param eol_mark: str - (optional) string to mark the end of lines, helps visualize trailing spaces (default="\|") :param mark_spaces: str - (optional) special character to display in place of spaces :param mark_control: str - (optional) convert non-printing control characters to a placeholding character; valid values: - "unicode" - replaces control chars with Unicode symbols, such as "␍" and "␊" - any single character string - replace control characters with given string - None (default) - string is displayed as-is :return: str - input string with leading line numbers and column number headers """ if expand_tabs: s = s.expandtabs() if mark_control is not None: if mark_control == "unicode": tbl = str.maketrans( {c: u for c, u in zip(range(0, 33), range(0x2400, 0x2433))} \| {127: 0x2421} ) eol_mark = "" else: tbl = str.maketrans( {c: mark_control for c in list(range(0, 32)) + [127]} ) s = s.translate(tbl) if mark_spaces is not None and mark_spaces != " ": if mark_spaces == "unicode": tbl = str.maketrans({9: 0x2409, 32: 0x2423}) s = s.translate(tbl) else: s = s.replace(" ", mark_spaces) if start_line is None: start_line = 1 if end_line is None: end_line = len(s) end_line = min(end_line, len(s)) start_line = min(max(1, start_line), end_line) if mark_control != "unicode": s_lines = s.splitlines()[start_line - 1 : end_line] else: s_lines = [line + "␊" for line in s.split("␊")[start_line - 1 : end_line]] if not s_lines: return "" lineno_width = len(str(end_line)) max_line_len = max(len(line) for line in s_lines) lead = " " * (lineno_width + 1) if max_line_len >= 99: header0 = ( lead + "".join( "{}{}".format(" " * 99, (i + 1) % 100) for i in range(max(max_line_len // 100, 1)) ) + "\n" ) else: header0 = "" header1 = ( header0 + lead + "".join( " {}".format((i + 1) % 10) for i in range(-(-max_line_len // 10)) ) + "\n" ) header2 = lead + "1234567890" * (-(-max_line_len // 10)) + "\n" return ( header1 + header2 + "\n".join( "{:{}d}:{}{}".format(i, lineno_width, line, eol_mark) for i, line in enumerate(s_lines, start=start_line) ) + "\n" )	13.09 KB	2026-01-20 12:58
📄 unicode.py # unicode.py import sys from itertools import filterfalse from typing import List, Tuple, Union class _lazyclassproperty: def __init__(self, fn): self.fn = fn self.__doc__ = fn.__doc__ self.__name__ = fn.__name__ def __get__(self, obj, cls): if cls is None: cls = type(obj) if not hasattr(cls, "_intern") or any( cls._intern is getattr(superclass, "_intern", []) for superclass in cls.__mro__[1:] ): cls._intern = {} attrname = self.fn.__name__ if attrname not in cls._intern: cls._intern[attrname] = self.fn(cls) return cls._intern[attrname] UnicodeRangeList = List[Union[Tuple[int, int], Tuple[int]]] class unicode_set: """ A set of Unicode characters, for language-specific strings for ``alphas``, ``nums``, ``alphanums``, and ``printables``. A unicode_set is defined by a list of ranges in the Unicode character set, in a class attribute ``_ranges``. Ranges can be specified using 2-tuples or a 1-tuple, such as:: _ranges = [ (0x0020, 0x007e), (0x00a0, 0x00ff), (0x0100,), ] Ranges are left- and right-inclusive. A 1-tuple of (x,) is treated as (x, x). A unicode set can also be defined using multiple inheritance of other unicode sets:: class CJK(Chinese, Japanese, Korean): pass """ _ranges: UnicodeRangeList = [] @_lazyclassproperty def _chars_for_ranges(cls): ret = [] for cc in cls.__mro__: if cc is unicode_set: break for rr in getattr(cc, "_ranges", ()): ret.extend(range(rr[0], rr[-1] + 1)) return [chr(c) for c in sorted(set(ret))] @_lazyclassproperty def printables(cls): "all non-whitespace characters in this range" return "".join(filterfalse(str.isspace, cls._chars_for_ranges)) @_lazyclassproperty def alphas(cls): "all alphabetic characters in this range" return "".join(filter(str.isalpha, cls._chars_for_ranges)) @_lazyclassproperty def nums(cls): "all numeric digit characters in this range" return "".join(filter(str.isdigit, cls._chars_for_ranges)) @_lazyclassproperty def alphanums(cls): "all alphanumeric characters in this range" return cls.alphas + cls.nums @_lazyclassproperty def identchars(cls): "all characters in this range that are valid identifier characters, plus underscore '_'" return "".join( sorted( set( "".join(filter(str.isidentifier, cls._chars_for_ranges)) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzªµº" + "ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ" + "_" ) ) ) @_lazyclassproperty def identbodychars(cls): """ all characters in this range that are valid identifier body characters, plus the digits 0-9 """ return "".join( sorted( set( cls.identchars + "0123456789" + "".join( [c for c in cls._chars_for_ranges if ("_" + c).isidentifier()] ) ) ) ) class pyparsing_unicode(unicode_set): """ A namespace class for defining common language unicode_sets. """ # fmt: off # define ranges in language character sets _ranges: UnicodeRangeList = [ (0x0020, sys.maxunicode), ] class BasicMultilingualPlane(unicode_set): "Unicode set for the Basic Multilingual Plane" _ranges: UnicodeRangeList = [ (0x0020, 0xFFFF), ] class Latin1(unicode_set): "Unicode set for Latin-1 Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0020, 0x007E), (0x00A0, 0x00FF), ] class LatinA(unicode_set): "Unicode set for Latin-A Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0100, 0x017F), ] class LatinB(unicode_set): "Unicode set for Latin-B Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0180, 0x024F), ] class Greek(unicode_set): "Unicode set for Greek Unicode Character Ranges" _ranges: UnicodeRangeList = [ (0x0342, 0x0345), (0x0370, 0x0377), (0x037A, 0x037F), (0x0384, 0x038A), (0x038C,), (0x038E, 0x03A1), (0x03A3, 0x03E1), (0x03F0, 0x03FF), (0x1D26, 0x1D2A), (0x1D5E,), (0x1D60,), (0x1D66, 0x1D6A), (0x1F00, 0x1F15), (0x1F18, 0x1F1D), (0x1F20, 0x1F45), (0x1F48, 0x1F4D), (0x1F50, 0x1F57), (0x1F59,), (0x1F5B,), (0x1F5D,), (0x1F5F, 0x1F7D), (0x1F80, 0x1FB4), (0x1FB6, 0x1FC4), (0x1FC6, 0x1FD3), (0x1FD6, 0x1FDB), (0x1FDD, 0x1FEF), (0x1FF2, 0x1FF4), (0x1FF6, 0x1FFE), (0x2129,), (0x2719, 0x271A), (0xAB65,), (0x10140, 0x1018D), (0x101A0,), (0x1D200, 0x1D245), (0x1F7A1, 0x1F7A7), ] class Cyrillic(unicode_set): "Unicode set for Cyrillic Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0400, 0x052F), (0x1C80, 0x1C88), (0x1D2B,), (0x1D78,), (0x2DE0, 0x2DFF), (0xA640, 0xA672), (0xA674, 0xA69F), (0xFE2E, 0xFE2F), ] class Chinese(unicode_set): "Unicode set for Chinese Unicode Character Range" _ranges: UnicodeRangeList = [ (0x2E80, 0x2E99), (0x2E9B, 0x2EF3), (0x31C0, 0x31E3), (0x3400, 0x4DB5), (0x4E00, 0x9FEF), (0xA700, 0xA707), (0xF900, 0xFA6D), (0xFA70, 0xFAD9), (0x16FE2, 0x16FE3), (0x1F210, 0x1F212), (0x1F214, 0x1F23B), (0x1F240, 0x1F248), (0x20000, 0x2A6D6), (0x2A700, 0x2B734), (0x2B740, 0x2B81D), (0x2B820, 0x2CEA1), (0x2CEB0, 0x2EBE0), (0x2F800, 0x2FA1D), ] class Japanese(unicode_set): "Unicode set for Japanese Unicode Character Range, combining Kanji, Hiragana, and Katakana ranges" _ranges: UnicodeRangeList = [] class Kanji(unicode_set): "Unicode set for Kanji Unicode Character Range" _ranges: UnicodeRangeList = [ (0x4E00, 0x9FBF), (0x3000, 0x303F), ] class Hiragana(unicode_set): "Unicode set for Hiragana Unicode Character Range" _ranges: UnicodeRangeList = [ (0x3041, 0x3096), (0x3099, 0x30A0), (0x30FC,), (0xFF70,), (0x1B001,), (0x1B150, 0x1B152), (0x1F200,), ] class Katakana(unicode_set): "Unicode set for Katakana Unicode Character Range" _ranges: UnicodeRangeList = [ (0x3099, 0x309C), (0x30A0, 0x30FF), (0x31F0, 0x31FF), (0x32D0, 0x32FE), (0xFF65, 0xFF9F), (0x1B000,), (0x1B164, 0x1B167), (0x1F201, 0x1F202), (0x1F213,), ] class Hangul(unicode_set): "Unicode set for Hangul (Korean) Unicode Character Range" _ranges: UnicodeRangeList = [ (0x1100, 0x11FF), (0x302E, 0x302F), (0x3131, 0x318E), (0x3200, 0x321C), (0x3260, 0x327B), (0x327E,), (0xA960, 0xA97C), (0xAC00, 0xD7A3), (0xD7B0, 0xD7C6), (0xD7CB, 0xD7FB), (0xFFA0, 0xFFBE), (0xFFC2, 0xFFC7), (0xFFCA, 0xFFCF), (0xFFD2, 0xFFD7), (0xFFDA, 0xFFDC), ] Korean = Hangul class CJK(Chinese, Japanese, Hangul): "Unicode set for combined Chinese, Japanese, and Korean (CJK) Unicode Character Range" class Thai(unicode_set): "Unicode set for Thai Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0E01, 0x0E3A), (0x0E3F, 0x0E5B) ] class Arabic(unicode_set): "Unicode set for Arabic Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0600, 0x061B), (0x061E, 0x06FF), (0x0700, 0x077F), ] class Hebrew(unicode_set): "Unicode set for Hebrew Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0591, 0x05C7), (0x05D0, 0x05EA), (0x05EF, 0x05F4), (0xFB1D, 0xFB36), (0xFB38, 0xFB3C), (0xFB3E,), (0xFB40, 0xFB41), (0xFB43, 0xFB44), (0xFB46, 0xFB4F), ] class Devanagari(unicode_set): "Unicode set for Devanagari Unicode Character Range" _ranges: UnicodeRangeList = [ (0x0900, 0x097F), (0xA8E0, 0xA8FF) ] # fmt: on pyparsing_unicode.Japanese._ranges = ( pyparsing_unicode.Japanese.Kanji._ranges + pyparsing_unicode.Japanese.Hiragana._ranges + pyparsing_unicode.Japanese.Katakana._ranges ) pyparsing_unicode.BMP = pyparsing_unicode.BasicMultilingualPlane # add language identifiers using language Unicode pyparsing_unicode.العربية = pyparsing_unicode.Arabic pyparsing_unicode.中文 = pyparsing_unicode.Chinese pyparsing_unicode.кириллица = pyparsing_unicode.Cyrillic pyparsing_unicode.Ελληνικά = pyparsing_unicode.Greek pyparsing_unicode.עִברִית = pyparsing_unicode.Hebrew pyparsing_unicode.日本語 = pyparsing_unicode.Japanese pyparsing_unicode.Japanese.漢字 = pyparsing_unicode.Japanese.Kanji pyparsing_unicode.Japanese.カタカナ = pyparsing_unicode.Japanese.Katakana pyparsing_unicode.Japanese.ひらがな = pyparsing_unicode.Japanese.Hiragana pyparsing_unicode.한국어 = pyparsing_unicode.Korean pyparsing_unicode.ไทย = pyparsing_unicode.Thai pyparsing_unicode.देवनागरी = pyparsing_unicode.Devanagari	10.53 KB	2026-01-20 12:58
📄 util.py # util.py import warnings import types import collections import itertools from functools import lru_cache from typing import List, Union, Iterable _bslash = chr(92) class __config_flags: """Internal class for defining compatibility and debugging flags""" _all_names: List[str] = [] _fixed_names: List[str] = [] _type_desc = "configuration" @classmethod def _set(cls, dname, value): if dname in cls._fixed_names: warnings.warn( "{}.{} {} is {} and cannot be overridden".format( cls.__name__, dname, cls._type_desc, str(getattr(cls, dname)).upper(), ) ) return if dname in cls._all_names: setattr(cls, dname, value) else: raise ValueError("no such {} {!r}".format(cls._type_desc, dname)) enable = classmethod(lambda cls, name: cls._set(name, True)) disable = classmethod(lambda cls, name: cls._set(name, False)) @lru_cache(maxsize=128) def col(loc: int, strg: str) -> int: """ Returns current column within a string, counting newlines as line separators. The first column is number 1. Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See :class:`ParserElement.parseString` for more information on parsing strings containing ``<TAB>`` s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ s = strg return 1 if 0 < loc < len(s) and s[loc - 1] == "\n" else loc - s.rfind("\n", 0, loc) @lru_cache(maxsize=128) def lineno(loc: int, strg: str) -> int: """Returns current line number within a string, counting newlines as line separators. The first line is number 1. Note - the default parsing behavior is to expand tabs in the input string before starting the parsing process. See :class:`ParserElement.parseString` for more information on parsing strings containing ``<TAB>`` s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ return strg.count("\n", 0, loc) + 1 @lru_cache(maxsize=128) def line(loc: int, strg: str) -> str: """ Returns the line of text containing loc within a string, counting newlines as line separators. """ last_cr = strg.rfind("\n", 0, loc) next_cr = strg.find("\n", loc) return strg[last_cr + 1 : next_cr] if next_cr >= 0 else strg[last_cr + 1 :] class _UnboundedCache: def __init__(self): cache = {} cache_get = cache.get self.not_in_cache = not_in_cache = object() def get(_, key): return cache_get(key, not_in_cache) def set_(_, key, value): cache[key] = value def clear(_): cache.clear() self.size = None self.get = types.MethodType(get, self) self.set = types.MethodType(set_, self) self.clear = types.MethodType(clear, self) class _FifoCache: def __init__(self, size): self.not_in_cache = not_in_cache = object() cache = collections.OrderedDict() cache_get = cache.get def get(_, key): return cache_get(key, not_in_cache) def set_(_, key, value): cache[key] = value while len(cache) > size: cache.popitem(last=False) def clear(_): cache.clear() self.size = size self.get = types.MethodType(get, self) self.set = types.MethodType(set_, self) self.clear = types.MethodType(clear, self) class LRUMemo: """ A memoizing mapping that retains `capacity` deleted items The memo tracks retained items by their access order; once `capacity` items are retained, the least recently used item is discarded. """ def __init__(self, capacity): self._capacity = capacity self._active = {} self._memory = collections.OrderedDict() def __getitem__(self, key): try: return self._active[key] except KeyError: self._memory.move_to_end(key) return self._memory[key] def __setitem__(self, key, value): self._memory.pop(key, None) self._active[key] = value def __delitem__(self, key): try: value = self._active.pop(key) except KeyError: pass else: while len(self._memory) >= self._capacity: self._memory.popitem(last=False) self._memory[key] = value def clear(self): self._active.clear() self._memory.clear() class UnboundedMemo(dict): """ A memoizing mapping that retains all deleted items """ def __delitem__(self, key): pass def _escape_regex_range_chars(s: str) -> str: # escape these chars: ^-[] for c in r"\^-[]": s = s.replace(c, _bslash + c) s = s.replace("\n", r"\n") s = s.replace("\t", r"\t") return str(s) def _collapse_string_to_ranges( s: Union[str, Iterable[str]], re_escape: bool = True ) -> str: def is_consecutive(c): c_int = ord(c) is_consecutive.prev, prev = c_int, is_consecutive.prev if c_int - prev > 1: is_consecutive.value = next(is_consecutive.counter) return is_consecutive.value is_consecutive.prev = 0 is_consecutive.counter = itertools.count() is_consecutive.value = -1 def escape_re_range_char(c): return "\\" + c if c in r"\^-][" else c def no_escape_re_range_char(c): return c if not re_escape: escape_re_range_char = no_escape_re_range_char ret = [] s = "".join(sorted(set(s))) if len(s) > 3: for _, chars in itertools.groupby(s, key=is_consecutive): first = last = next(chars) last = collections.deque( itertools.chain(iter([last]), chars), maxlen=1 ).pop() if first == last: ret.append(escape_re_range_char(first)) else: sep = "" if ord(last) == ord(first) + 1 else "-" ret.append( "{}{}{}".format( escape_re_range_char(first), sep, escape_re_range_char(last) ) ) else: ret = [escape_re_range_char(c) for c in s] return "".join(ret) def _flatten(ll: list) -> list: ret = [] for i in ll: if isinstance(i, list): ret.extend(_flatten(i)) else: ret.append(i) return ret	6.65 KB	2026-01-20 12:58

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