+++ /dev/null
-// Copyright 2013 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 main
-
-// This file defines utilities for working with file positions.
-
-import (
- "fmt"
- "go/build"
- "go/parser"
- "go/token"
- "os"
- "path/filepath"
- "strconv"
- "strings"
-
- "golang.org/x/tools/go/ast/astutil"
- "golang.org/x/tools/go/buildutil"
-)
-
-// parseOctothorpDecimal returns the numeric value if s matches "#%d",
-// otherwise -1.
-func parseOctothorpDecimal(s string) int {
- if s != "" && s[0] == '#' {
- if s, err := strconv.ParseInt(s[1:], 10, 32); err == nil {
- return int(s)
- }
- }
- return -1
-}
-
-// parsePos parses a string of the form "file:pos" or
-// file:start,end" where pos, start, end match #%d and represent byte
-// offsets, and returns its components.
-//
-// (Numbers without a '#' prefix are reserved for future use,
-// e.g. to indicate line/column positions.)
-//
-func parsePos(pos string) (filename string, startOffset, endOffset int, err error) {
- if pos == "" {
- err = fmt.Errorf("no source position specified")
- return
- }
-
- colon := strings.LastIndex(pos, ":")
- if colon < 0 {
- err = fmt.Errorf("bad position syntax %q", pos)
- return
- }
- filename, offset := pos[:colon], pos[colon+1:]
- startOffset = -1
- endOffset = -1
- if comma := strings.Index(offset, ","); comma < 0 {
- // e.g. "foo.go:#123"
- startOffset = parseOctothorpDecimal(offset)
- endOffset = startOffset
- } else {
- // e.g. "foo.go:#123,#456"
- startOffset = parseOctothorpDecimal(offset[:comma])
- endOffset = parseOctothorpDecimal(offset[comma+1:])
- }
- if startOffset < 0 || endOffset < 0 {
- err = fmt.Errorf("invalid offset %q in query position", offset)
- return
- }
- return
-}
-
-// fileOffsetToPos translates the specified file-relative byte offsets
-// into token.Pos form. It returns an error if the file was not found
-// or the offsets were out of bounds.
-//
-func fileOffsetToPos(file *token.File, startOffset, endOffset int) (start, end token.Pos, err error) {
- // Range check [start..end], inclusive of both end-points.
-
- if 0 <= startOffset && startOffset <= file.Size() {
- start = file.Pos(int(startOffset))
- } else {
- err = fmt.Errorf("start position is beyond end of file")
- return
- }
-
- if 0 <= endOffset && endOffset <= file.Size() {
- end = file.Pos(int(endOffset))
- } else {
- err = fmt.Errorf("end position is beyond end of file")
- return
- }
-
- return
-}
-
-// sameFile returns true if x and y have the same basename and denote
-// the same file.
-//
-func sameFile(x, y string) bool {
- if filepath.Base(x) == filepath.Base(y) { // (optimisation)
- if xi, err := os.Stat(x); err == nil {
- if yi, err := os.Stat(y); err == nil {
- return os.SameFile(xi, yi)
- }
- }
- }
- return false
-}
-
-// fastQueryPos parses the position string and returns a queryPos.
-// It parses only a single file and does not run the type checker.
-func fastQueryPos(ctxt *build.Context, pos string) (*queryPos, error) {
- filename, startOffset, endOffset, err := parsePos(pos)
- if err != nil {
- return nil, err
- }
-
- // Parse the file, opening it the file via the build.Context
- // so that we observe the effects of the -modified flag.
- fset := token.NewFileSet()
- cwd, _ := os.Getwd()
- f, err := buildutil.ParseFile(fset, ctxt, nil, cwd, filename, parser.Mode(0))
- // ParseFile usually returns a partial file along with an error.
- // Only fail if there is no file.
- if f == nil {
- return nil, err
- }
- if !f.Pos().IsValid() {
- return nil, fmt.Errorf("%s is not a Go source file", filename)
- }
-
- start, end, err := fileOffsetToPos(fset.File(f.Pos()), startOffset, endOffset)
- if err != nil {
- return nil, err
- }
-
- path, exact := astutil.PathEnclosingInterval(f, start, end)
- if path == nil {
- return nil, fmt.Errorf("no syntax here")
- }
-
- return &queryPos{fset, start, end, path, exact, nil}, nil
-}
projects / dotfiles / .git / blobdiff