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📁 ..	-	2025-05-25 12:27
📄 remap.go // Copyright 2017 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Package remap handles tracking the locations of Go tokens in a source text // across a rewrite by the Go formatter. package remap import ( "fmt" "go/scanner" "go/token" ) // A Location represents a span of byte offsets in the source text. type Location struct { Pos, End int // End is exclusive } // A Map represents a mapping between token locations in an input source text // and locations in the correspnding output text. type Map map[Location]Location // Find reports whether the specified span is recorded by m, and if so returns // the new location it was mapped to. If the input span was not found, the // returned location is the same as the input. func (m Map) Find(pos, end int) (Location, bool) { key := Location{ Pos: pos, End: end, } if loc, ok := m[key]; ok { return loc, true } return key, false } func (m Map) add(opos, oend, npos, nend int) { m[Location{Pos: opos, End: oend}] = Location{Pos: npos, End: nend} } // Compute constructs a location mapping from input to output. An error is // reported if any of the tokens of output cannot be mapped. func Compute(input, output []byte) (Map, error) { itok := tokenize(input) otok := tokenize(output) if len(itok) != len(otok) { return nil, fmt.Errorf("wrong number of tokens, %d ≠ %d", len(itok), len(otok)) } m := make(Map) for i, ti := range itok { to := otok[i] if ti.Token != to.Token { return nil, fmt.Errorf("token %d type mismatch: %s ≠ %s", i+1, ti, to) } m.add(ti.pos, ti.end, to.pos, to.end) } return m, nil } // tokinfo records the span and type of a source token. type tokinfo struct { pos, end int token.Token } func tokenize(src []byte) []tokinfo { fs := token.NewFileSet() var s scanner.Scanner s.Init(fs.AddFile("src", fs.Base(), len(src)), src, nil, scanner.ScanComments) var info []tokinfo for { pos, next, lit := s.Scan() switch next { case token.SEMICOLON: continue } info = append(info, tokinfo{ pos: int(pos - 1), end: int(pos + token.Pos(len(lit)) - 1), Token: next, }) if next == token.EOF { break } } return info }	2.21 KB	2025-05-25 12:27
📄 remap_test.go // Copyright 2017 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package remap import ( "go/format" "testing" ) func TestErrors(t testing.T) { tests := []struct { in, out string }{ {"", "x"}, {"x", ""}, {"var x int = 5\n", "var x = 5\n"}, {"these are \"one\" thing", "those are 'another' thing"}, } for _, test := range tests { m, err := Compute([]byte(test.in), []byte(test.out)) if err != nil { t.Logf("Got expected error: %v", err) continue } t.Errorf("Compute(%q, %q): got %+v, wanted error", test.in, test.out, m) } } func TestMatching(t testing.T) { // The input is a source text that will be rearranged by the formatter. const input = `package foo var s int func main(){} ` output, err := format.Source([]byte(input)) if err != nil { t.Fatalf("Formatting failed: %v", err) } m, err := Compute([]byte(input), output) if err != nil { t.Fatalf("Unexpected error: %v", err) } // Verify that the mapped locations have the same text. for key, val := range m { want := input[key.Pos:key.End] got := string(output[val.Pos:val.End]) if got != want { t.Errorf("Token at %d:%d: got %q, want %q", key.Pos, key.End, got, want) } } }	1.26 KB	2025-05-25 12:27

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