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📄 ParseWords.pm package Text::ParseWords; use strict; require 5.006; our $VERSION = "3.30"; use Exporter; our @ISA = qw(Exporter); our @EXPORT = qw(shellwords quotewords nested_quotewords parse_line); our @EXPORT_OK = qw(old_shellwords); our $PERL_SINGLE_QUOTE; sub shellwords { my (@lines) = @_; my @allwords; foreach my $line (@lines) { $line =~ s/^\s+//; my @words = parse_line('\s+', 0, $line); pop @words if (@words and !defined $words[-1]); return() unless (@words \|\| !length($line)); push(@allwords, @words); } return(@allwords); } sub quotewords { my($delim, $keep, @lines) = @_; my($line, @words, @allwords); foreach $line (@lines) { @words = parse_line($delim, $keep, $line); return() unless (@words \|\| !length($line)); push(@allwords, @words); } return(@allwords); } sub nested_quotewords { my($delim, $keep, @lines) = @_; my($i, @allwords); for ($i = 0; $i < @lines; $i++) { @{$allwords[$i]} = parse_line($delim, $keep, $lines[$i]); return() unless (@{$allwords[$i]} \|\| !length($lines[$i])); } return(@allwords); } sub parse_line { my($delimiter, $keep, $line) = @_; my($word, @pieces); no warnings 'uninitialized'; # we will be testing undef strings while (length($line)) { # This pattern is optimised to be stack conservative on older perls. # Do not refactor without being careful and testing it on very long strings. # See Perl bug #42980 for an example of a stack busting input. $line =~ s/^ (?: # double quoted string (") # $quote ((?>[^\\"](?:\\.[^\\"])))" # $quoted \| # --OR-- # singe quoted string (') # $quote ((?>[^\\'](?:\\.[^\\'])))' # $quoted \| # --OR-- # unquoted string ( # $unquoted (?:\\.\|[^\\"'])? ) # followed by ( # $delim \Z(?!\n) # EOL \| # --OR-- (?-x:$delimiter) # delimiter \| # --OR-- (?!^)(?=["']) # a quote ) )//xs or return; # extended layout my ($quote, $quoted, $unquoted, $delim) = (($1 ? ($1,$2) : ($3,$4)), $5, $6); return() unless( defined($quote) \|\| length($unquoted) \|\| length($delim)); if ($keep) { $quoted = "$quote$quoted$quote"; } else { $unquoted =~ s/\\(.)/$1/sg; if (defined $quote) { $quoted =~ s/\\(.)/$1/sg if ($quote eq '"'); $quoted =~ s/\\([\\'])/$1/g if ( $PERL_SINGLE_QUOTE && $quote eq "'"); } } $word .= substr($line, 0, 0); # leave results tainted $word .= defined $quote ? $quoted : $unquoted; if (length($delim)) { push(@pieces, $word); push(@pieces, $delim) if ($keep eq 'delimiters'); undef $word; } if (!length($line)) { push(@pieces, $word); } } return(@pieces); } sub old_shellwords { # Usage: # use ParseWords; # @words = old_shellwords($line); # or # @words = old_shellwords(@lines); # or # @words = old_shellwords(); # defaults to $_ (and clobbers it) no warnings 'uninitialized'; # we will be testing undef strings local _ = \join('', @_) if @_; my (@words, $snippet); s/\A\s+//; while ($_ ne '') { my $field = substr($_, 0, 0); # leave results tainted for (;;) { if (s/\A"(([^"\\]\|\\.))"//s) { ($snippet = $1) =~ s#\\(.)#$1#sg; } elsif (/\A"/) { require Carp; Carp::carp("Unmatched double quote: $_"); return(); } elsif (s/\A'(([^'\\]\|\\.))'//s) { ($snippet = $1) =~ s#\\(.)#$1#sg; } elsif (/\A'/) { require Carp; Carp::carp("Unmatched single quote: $_"); return(); } elsif (s/\A\\(.?)//s) { $snippet = $1; } elsif (s/\A([^\s\\'"]+)//) { $snippet = $1; } else { s/\A\s+//; last; } $field .= $snippet; } push(@words, $field); } return @words; } 1; __END__ =head1 NAME Text::ParseWords - parse text into an array of tokens or array of arrays =head1 SYNOPSIS use Text::ParseWords; @lists = nested_quotewords($delim, $keep, @lines); @words = quotewords($delim, $keep, @lines); @words = shellwords(@lines); @words = parse_line($delim, $keep, $line); @words = old_shellwords(@lines); # DEPRECATED! =head1 DESCRIPTION The &nested_quotewords() and &quotewords() functions accept a delimiter (which can be a regular expression) and a list of lines and then breaks those lines up into a list of words ignoring delimiters that appear inside quotes. &quotewords() returns all of the tokens in a single long list, while &nested_quotewords() returns a list of token lists corresponding to the elements of @lines. &parse_line() does tokenizing on a single string. The &quotewords() functions simply call &parse_line(), so if you're only splitting one line you can call &parse_line() directly and save a function call. The $keep argument is a boolean flag. If true, then the tokens are split on the specified delimiter, but all other characters (including quotes and backslashes) are kept in the tokens. If $keep is false then the &quotewords() functions remove all quotes and backslashes that are not themselves backslash-escaped or inside of single quotes (i.e., &quotewords() tries to interpret these characters just like the Bourne shell). NB: these semantics are significantly different from the original version of this module shipped with Perl 5.000 through 5.004. As an additional feature, $keep may be the keyword "delimiters" which causes the functions to preserve the delimiters in each string as tokens in the token lists, in addition to preserving quote and backslash characters. &shellwords() is written as a special case of &quotewords(), and it does token parsing with whitespace as a delimiter-- similar to most Unix shells. =head1 EXAMPLES The sample program: use Text::ParseWords; @words = quotewords('\s+', 0, q{this is "a test" of\ quotewords \"for you}); $i = 0; foreach (@words) { print "$i: <$_>\n"; $i++; } produces: 0: <this> 1: <is> 2: <a test> 3: <of quotewords> 4: <"for> 5: <you> demonstrating: =over 4 =item 0Z<> a simple word =item 1Z<> multiple spaces are skipped because of our $delim =item 2Z<> use of quotes to include a space in a word =item 3Z<> use of a backslash to include a space in a word =item 4Z<> use of a backslash to remove the special meaning of a double-quote =item 5Z<> another simple word (note the lack of effect of the backslashed double-quote) =back Replacing C<quotewords('\s+', 0, q{this is...})> with C<shellwords(q{this is...})> is a simpler way to accomplish the same thing. =head1 SEE ALSO L<Text::CSV> - for parsing CSV files =head1 AUTHORS Maintainer: Alexandr Ciornii <alexchornyATgmail.com>. Previous maintainer: Hal Pomeranz <pomeranz@netcom.com>, 1994-1997 (Original author unknown). Much of the code for &parse_line() (including the primary regexp) from Joerk Behrends <jbehrends@multimediaproduzenten.de>. Examples section another documentation provided by John Heidemann <johnh@ISI.EDU> Bug reports, patches, and nagging provided by lots of folks-- thanks everybody! Special thanks to Michael Schwern <schwern@envirolink.org> for assuring me that a &nested_quotewords() would be useful, and to Jeff Friedl <jfriedl@yahoo-inc.com> for telling me not to worry about error-checking (sort of-- you had to be there). =head1 COPYRIGHT AND LICENSE This library is free software; you may redistribute and/or modify it under the same terms as Perl itself. =cut	7.95 KB	2015-03-11 09:41
📄 Tabs.pm package Text::Tabs; require Exporter; @ISA = (Exporter); @EXPORT = qw(expand unexpand $tabstop); use vars qw($VERSION $SUBVERSION $tabstop $debug); $VERSION = 2013.0523; $SUBVERSION = 'modern'; use strict; use 5.010_000; BEGIN { $tabstop = 8; $debug = 0; } my $CHUNK = qr/\X/; sub _xlen (_) { scalar(() = $_[0] =~ /$CHUNK/g) } sub _xpos (_) { _xlen( substr( $_[0], 0, pos($_[0]) ) ) } sub expand { my @l; my $pad; for ( @_ ) { my $s = ''; for (split(/^/m, $_, -1)) { my $offs = 0; s{\t}{ # this works on both 5.10 and 5.11 $pad = $tabstop - (_xlen(${^PREMATCH}) + $offs) % $tabstop; # this works on 5.11, but fails on 5.10 #XXX# $pad = $tabstop - (_xpos() + $offs) % $tabstop; $offs += $pad - 1; " " x $pad; }peg; $s .= $_; } push(@l, $s); } return @l if wantarray; return $l[0]; } sub unexpand { my (@l) = @_; my @e; my $x; my $line; my @lines; my $lastbit; my $ts_as_space = " " x $tabstop; for $x (@l) { @lines = split("\n", $x, -1); for $line (@lines) { $line = expand($line); @e = split(/(${CHUNK}{$tabstop})/,$line,-1); $lastbit = pop(@e); $lastbit = '' unless defined $lastbit; $lastbit = "\t" if $lastbit eq $ts_as_space; for $_ (@e) { if ($debug) { my $x = $_; $x =~ s/\t/^I\t/gs; print "sub on '$x'\n"; } s/ +$/\t/; } $line = join('',@e, $lastbit); } $x = join("\n", @lines); } return @l if wantarray; return $l[0]; } 1; __END__ sub expand { my (@l) = @_; for $_ (@l) { 1 while s/(^\|\n)([^\t\n])(\t+)/ $1. $2 . (" " x ($tabstop length($3) - (length($2) % $tabstop))) /sex; } return @l if wantarray; return $l[0]; } =head1 NAME Text::Tabs - expand and unexpand tabs like unix expand(1) and unexpand(1) =head1 SYNOPSIS use Text::Tabs; $tabstop = 4; # default = 8 @lines_without_tabs = expand(@lines_with_tabs); @lines_with_tabs = unexpand(@lines_without_tabs); =head1 DESCRIPTION Text::Tabs does most of what the unix utilities expand(1) and unexpand(1) do. Given a line with tabs in it, C<expand> replaces those tabs with the appropriate number of spaces. Given a line with or without tabs in it, C<unexpand> adds tabs when it can save bytes by doing so, like the C<unexpand -a> command. Unlike the old unix utilities, this module correctly accounts for any Unicode combining characters (such as diacriticals) that may occur in each line for both expansion and unexpansion. These are overstrike characters that do not increment the logical position. Make sure you have the appropriate Unicode settings enabled. =head1 EXPORTS The following are exported: =over 4 =item expand =item unexpand =item $tabstop The C<$tabstop> variable controls how many column positions apart each tabstop is. The default is 8. Please note that C<local($tabstop)> doesn't do the right thing and if you want to use C<local> to override C<$tabstop>, you need to use C<local($Text::Tabs::tabstop)>. =back =head1 EXAMPLE #!perl # unexpand -a use Text::Tabs; while (<>) { print unexpand $_; } Instead of the shell's C<expand> command, use: perl -MText::Tabs -n -e 'print expand $_' Instead of the shell's C<unexpand -a> command, use: perl -MText::Tabs -n -e 'print unexpand $_' =head1 SUBVERSION This module comes in two flavors: one for modern perls (5.10 and above) and one for ancient obsolete perls. The version for modern perls has support for Unicode. The version for old perls does not. You can tell which version you have installed by looking at C<$Text::Tabs::SUBVERSION>: it is C<old> for obsolete perls and C<modern> for current perls. This man page is for the version for modern perls and so that's probably what you've got. =head1 BUGS Text::Tabs handles only tabs (C<"\t">) and combining characters (C</\pM/>). It doesn't count backwards for backspaces (C<"\t">), omit other non-printing control characters (C</\pC/>), or otherwise deal with any other zero-, half-, and full-width characters. =head1 LICENSE Copyright (C) 1996-2002,2005,2006 David Muir Sharnoff. Copyright (C) 2005 Aristotle Pagaltzis Copyright (C) 2012-2013 Google, Inc. This module may be modified, used, copied, and redistributed at your own risk. Although allowed by the preceding license, please do not publicly redistribute modified versions of this code with the name "Text::Tabs" unless it passes the unmodified Text::Tabs test suite.	4.35 KB	2013-05-23 01:35
📄 Wrap.pm package Text::Wrap; use warnings::register; require Exporter; @ISA = qw(Exporter); @EXPORT = qw(wrap fill); @EXPORT_OK = qw($columns $break $huge); $VERSION = 2013.0523; $SUBVERSION = 'modern'; use 5.010_000; use vars qw($VERSION $SUBVERSION $columns $debug $break $huge $unexpand $tabstop $separator $separator2); use strict; BEGIN { $columns = 76; # <= screen width $debug = 0; $break = '(?=\s)\X'; $huge = 'wrap'; # alternatively: 'die' or 'overflow' $unexpand = 1; $tabstop = 8; $separator = "\n"; $separator2 = undef; } my $CHUNK = qr/\X/; sub _xlen(_) { scalar(() = $_[0] =~ /$CHUNK/g) } sub _xpos(_) { _xlen( substr( $_[0], 0, pos($_[0]) ) ) } use Text::Tabs qw(expand unexpand); sub wrap { my ($ip, $xp, @t) = @_; local($Text::Tabs::tabstop) = $tabstop; my $r = ""; my $tail = pop(@t); my $t = expand(join("", (map { /\s+\z/ ? ( $_ ) : ($_, ' ') } @t), $tail)); my $lead = $ip; my $nll = $columns - _xlen(expand($xp)) - 1; if ($nll <= 0 && $xp ne '') { my $nc = _xlen(expand($xp)) + 2; warnings::warnif "Increasing \$Text::Wrap::columns from $columns to $nc to accommodate length of subsequent tab"; $columns = $nc; $nll = 1; } my $ll = $columns - _xlen(expand($ip)) - 1; $ll = 0 if $ll < 0; my $nl = ""; my $remainder = ""; use re 'taint'; pos($t) = 0; while ($t !~ /\G(?:$break)\Z/gc) { if ($t =~ /\G((?:(?=[^\n])\X){0,$ll})($break\|\n+\|\z)/xmgc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = $2; } elsif ($huge eq 'wrap' && $t =~ /\G((?:(?=[^\n])\X){$ll})/gc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = defined($separator2) ? $separator2 : $separator; } elsif ($huge eq 'overflow' && $t =~ /\G((?:(?=[^\n])\X)?)($break\|\n+\|\z)/xmgc) { $r .= $unexpand ? unexpand($nl . $lead . $1) : $nl . $lead . $1; $remainder = $2; } elsif ($huge eq 'die') { die "couldn't wrap '$t'"; } elsif ($columns < 2) { warnings::warnif "Increasing \$Text::Wrap::columns from $columns to 2"; $columns = 2; return ($ip, $xp, @t); } else { die "This shouldn't happen"; } $lead = $xp; $ll = $nll; $nl = defined($separator2) ? ($remainder eq "\n" ? "\n" : $separator2) : $separator; } $r .= $remainder; print "-----------$r---------\n" if $debug; print "Finish up with '$lead'\n" if $debug; my($opos) = pos($t); $r .= $lead . substr($t, pos($t), length($t) - pos($t)) if pos($t) ne length($t); print "-----------$r---------\n" if $debug;; return $r; } sub fill { my ($ip, $xp, @raw) = @_; my @para; my $pp; for $pp (split(/\n\s+/, join("\n",@raw))) { $pp =~ s/\s+/ /g; my $x = wrap($ip, $xp, $pp); push(@para, $x); } # if paragraph_indent is the same as line_indent, # separate paragraphs with blank lines my $ps = ($ip eq $xp) ? "\n\n" : "\n"; return join ($ps, @para); } 1; __END__ =head1 NAME Text::Wrap - line wrapping to form simple paragraphs =head1 SYNOPSIS B<Example 1> use Text::Wrap; $initial_tab = "\t"; # Tab before first line $subsequent_tab = ""; # All other lines flush left print wrap($initial_tab, $subsequent_tab, @text); print fill($initial_tab, $subsequent_tab, @text); $lines = wrap($initial_tab, $subsequent_tab, @text); @paragraphs = fill($initial_tab, $subsequent_tab, @text); B<Example 2> use Text::Wrap qw(wrap $columns $huge); $columns = 132; # Wrap at 132 characters $huge = 'die'; $huge = 'wrap'; $huge = 'overflow'; B<Example 3> use Text::Wrap; $Text::Wrap::columns = 72; print wrap('', '', @text); =head1 DESCRIPTION C<Text::Wrap::wrap()> is a very simple paragraph formatter. It formats a single paragraph at a time by breaking lines at word boundaries. Indentation is controlled for the first line (C<$initial_tab>) and all subsequent lines (C<$subsequent_tab>) independently. Please note: C<$initial_tab> and C<$subsequent_tab> are the literal strings that will be used: it is unlikely you would want to pass in a number. C<Text::Wrap::fill()> is a simple multi-paragraph formatter. It formats each paragraph separately and then joins them together when it's done. It will destroy any whitespace in the original text. It breaks text into paragraphs by looking for whitespace after a newline. In other respects, it acts like wrap(). C<wrap()> compresses trailing whitespace into one newline, and C<fill()> deletes all trailing whitespace. Both C<wrap()> and C<fill()> return a single string. Unlike the old Unix fmt(1) utility, this module correctly accounts for any Unicode combining characters (such as diacriticals) that may occur in each line for both expansion and unexpansion. These are overstrike characters that do not increment the logical position. Make sure you have the appropriate Unicode settings enabled. =head1 OVERRIDES C<Text::Wrap::wrap()> has a number of variables that control its behavior. Because other modules might be using C<Text::Wrap::wrap()> it is suggested that you leave these variables alone! If you can't do that, then use C<local($Text::Wrap::VARIABLE) = YOURVALUE> when you change the values so that the original value is restored. This C<local()> trick will not work if you import the variable into your own namespace. Lines are wrapped at C<$Text::Wrap::columns> columns (default value: 76). C<$Text::Wrap::columns> should be set to the full width of your output device. In fact, every resulting line will have length of no more than C<$columns - 1>. It is possible to control which characters terminate words by modifying C<$Text::Wrap::break>. Set this to a string such as C<'[\s:]'> (to break before spaces or colons) or a pre-compiled regexp such as C<qr/[\s']/> (to break before spaces or apostrophes). The default is simply C<'\s'>; that is, words are terminated by spaces. (This means, among other things, that trailing punctuation such as full stops or commas stay with the word they are "attached" to.) Setting C<$Text::Wrap::break> to a regular expression that doesn't eat any characters (perhaps just a forward look-ahead assertion) will cause warnings. Beginner note: In example 2, above C<$columns> is imported into the local namespace, and set locally. In example 3, C<$Text::Wrap::columns> is set in its own namespace without importing it. C<Text::Wrap::wrap()> starts its work by expanding all the tabs in its input into spaces. The last thing it does it to turn spaces back into tabs. If you do not want tabs in your results, set C<$Text::Wrap::unexpand> to a false value. Likewise if you do not want to use 8-character tabstops, set C<$Text::Wrap::tabstop> to the number of characters you do want for your tabstops. If you want to separate your lines with something other than C<\n> then set C<$Text::Wrap::separator> to your preference. This replaces all newlines with C<$Text::Wrap::separator>. If you just want to preserve existing newlines but add new breaks with something else, set C<$Text::Wrap::separator2> instead. When words that are longer than C<$columns> are encountered, they are broken up. C<wrap()> adds a C<"\n"> at column C<$columns>. This behavior can be overridden by setting C<$huge> to 'die' or to 'overflow'. When set to 'die', large words will cause C<die()> to be called. When set to 'overflow', large words will be left intact. Historical notes: 'die' used to be the default value of C<$huge>. Now, 'wrap' is the default value. =head1 EXAMPLES Code: print wrap("\t","",<<END); This is a bit of text that forms a normal book-style indented paragraph END Result: " This is a bit of text that forms a normal book-style indented paragraph " Code: $Text::Wrap::columns=20; $Text::Wrap::separator="\|"; print wrap("","","This is a bit of text that forms a normal book-style paragraph"); Result: "This is a bit of\|text that forms a\|normal book-style\|paragraph" =head1 SUBVERSION This module comes in two flavors: one for modern perls (5.10 and above) and one for ancient obsolete perls. The version for modern perls has support for Unicode. The version for old perls does not. You can tell which version you have installed by looking at C<$Text::Wrap::SUBVERSION>: it is C<old> for obsolete perls and C<modern> for current perls. This man page is for the version for modern perls and so that's probably what you've got. =head1 SEE ALSO For correct handling of East Asian half- and full-width characters, see L<Text::WrapI18N>. For more detailed controls: L<Text::Format>. =head1 AUTHOR David Muir Sharnoff <cpan@dave.sharnoff.org> with help from Tim Pierce and many many others. =head1 LICENSE Copyright (C) 1996-2009 David Muir Sharnoff. Copyright (C) 2012-2013 Google, Inc. This module may be modified, used, copied, and redistributed at your own risk. Although allowed by the preceding license, please do not publicly redistribute modified versions of this code with the name "Text::Wrap" unless it passes the unmodified Text::Wrap test suite.	8.81 KB	2013-05-23 01:35

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