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