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https://golang.org/cl/170920043
75 lines
2.0 KiB
Go
75 lines
2.0 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file contains support functions for parsing .go files
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// accessed via godoc's file system fs.
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package godoc
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import (
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"bytes"
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"go/ast"
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"go/parser"
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"go/token"
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pathpkg "path"
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"golang.org/x/tools/godoc/vfs"
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)
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var linePrefix = []byte("//line ")
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// This function replaces source lines starting with "//line " with a blank line.
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// It does this irrespective of whether the line is truly a line comment or not;
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// e.g., the line may be inside a string, or a /*-style comment; however that is
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// rather unlikely (proper testing would require a full Go scan which we want to
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// avoid for performance).
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func replaceLinePrefixCommentsWithBlankLine(src []byte) {
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for {
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i := bytes.Index(src, linePrefix)
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if i < 0 {
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break // we're done
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}
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// 0 <= i && i+len(linePrefix) <= len(src)
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if i == 0 || src[i-1] == '\n' {
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// at beginning of line: blank out line
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for i < len(src) && src[i] != '\n' {
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src[i] = ' '
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i++
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}
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} else {
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// not at beginning of line: skip over prefix
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i += len(linePrefix)
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}
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// i <= len(src)
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src = src[i:]
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}
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}
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func (c *Corpus) parseFile(fset *token.FileSet, filename string, mode parser.Mode) (*ast.File, error) {
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src, err := vfs.ReadFile(c.fs, filename)
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if err != nil {
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return nil, err
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}
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// Temporary ad-hoc fix for issue 5247.
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// TODO(gri) Remove this in favor of a better fix, eventually (see issue 7702).
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replaceLinePrefixCommentsWithBlankLine(src)
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return parser.ParseFile(fset, filename, src, mode)
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}
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func (c *Corpus) parseFiles(fset *token.FileSet, relpath string, abspath string, localnames []string) (map[string]*ast.File, error) {
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files := make(map[string]*ast.File)
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for _, f := range localnames {
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absname := pathpkg.Join(abspath, f)
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file, err := c.parseFile(fset, absname, parser.ParseComments)
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if err != nil {
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return nil, err
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}
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files[pathpkg.Join(relpath, f)] = file
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}
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return files, nil
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}
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