Golang FileSet.Iterate方法代码示例

func doParseFiles(filePathes []string, fset *token.FileSet) (*token.FileSet, []*ast.File, error) {
	if fset == nil {
		fset = token.NewFileSet()
	}
	util.Info("parsing files %v", filePathes)
	astFiles := make([]*ast.File, 0, len(filePathes))
	for _, f := range filePathes {
		//XXX: Ignoring files with packages ends with _test.
		//XXX: Doing that because getting error in check()
		//XXX: cause source file is still going to current
		//XXX: packages. Need to analyze package before
		//XXX: and check both packages separately.
		tempFset := token.NewFileSet()
		astFile, err := parser.ParseFile(tempFset, f, nil, 0)
		if !strings.HasSuffix(astFile.Name.Name, "_test") {
			if err != nil {
				return nil, nil, err
			}
			astFile, _ := parser.ParseFile(fset, f, nil, 0)
			astFiles = append(astFiles, astFile)
		}
	}

	iterateFunc := func(f *token.File) bool {
		util.Debug("\t%s", f.Name())
		return true
	}
	fset.Iterate(iterateFunc)
	return fset, astFiles, nil
}

// findQueryPos searches fset for filename and 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 findQueryPos(fset *token.FileSet, filename string, startOffset, endOffset int) (start, end token.Pos, err error) {
	var file *token.File
	fset.Iterate(func(f *token.File) bool {
		if sameFile(filename, f.Name()) {
			// (f.Name() is absolute)
			file = f
			return false // done
		}
		return true // continue
	})
	if file == nil {
		err = fmt.Errorf("couldn't find file containing position")
		return
	}

	// 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
}

// parseQueryPos parses a string of the form "file:pos" or
// file:start,end" where pos, start, end match #%d and represent byte
// offsets, and returns the extent to which it refers.
//
// (Numbers without a '#' prefix are reserved for future use,
// e.g. to indicate line/column positions.)
//
func parseQueryPos(fset *token.FileSet, queryPos string) (start, end token.Pos, err error) {
	if queryPos == "" {
		err = fmt.Errorf("no source position specified (-pos flag)")
		return
	}

	colon := strings.LastIndex(queryPos, ":")
	if colon < 0 {
		err = fmt.Errorf("invalid source position -pos=%q", queryPos)
		return
	}
	filename, offset := queryPos[:colon], queryPos[colon+1:]
	startOffset := -1
	endOffset := -1
	if hyphen := strings.Index(offset, ","); hyphen < 0 {
		// e.g. "foo.go:#123"
		startOffset = parseOctothorpDecimal(offset)
		endOffset = startOffset
	} else {
		// e.g. "foo.go:#123,#456"
		startOffset = parseOctothorpDecimal(offset[:hyphen])
		endOffset = parseOctothorpDecimal(offset[hyphen+1:])
	}
	if startOffset < 0 || endOffset < 0 {
		err = fmt.Errorf("invalid -pos offset %q", offset)
		return
	}

	var file *token.File
	fset.Iterate(func(f *token.File) bool {
		if sameFile(filename, f.Name()) {
			// (f.Name() is absolute)
			file = f
			return false // done
		}
		return true // continue
	})
	if file == nil {
		err = fmt.Errorf("couldn't find file containing position -pos=%q", queryPos)
		return
	}

	// 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 -pos=%q", queryPos)
		return
	}

	if 0 <= endOffset && endOffset <= file.Size() {
		end = file.Pos(int(endOffset))
	} else {
		err = fmt.Errorf("end position is beyond end of file -pos=%q", queryPos)
		return
	}

	return
}

func LogFileSet(fset *token.FileSet) {
	Log("FileSet:")
	fset.Iterate(func(f *token.File) bool {
		Log("  %s", f.Name())
		return true
	})
}

// getFile assumes that each filename occurs at most once
func getFile(fset *token.FileSet, filename string) (file *token.File) {
	fset.Iterate(func(f *token.File) bool {
		if f.Name() == filename {
			if file != nil {
				panic(filename + " used multiple times")
			}
			file = f
		}
		return true
	})
	return file
}

//GetUnusedSources returns list of source files in package that
//are not presenting in the file set
func GetUnusedSources(pkg string, fset *token.FileSet) ([]string, error) {
	unusedSource, err := SourceFiles(pkg, true)

	if err != nil {
		return nil, err
	}

	iterateFiles := func(f *token.File) bool {
		idx := indexOf(unusedSource, f.Name())
		if idx >= 0 {
			unusedSource = append(unusedSource[:idx], unusedSource[idx+1:]...)
		}
		return true
	}
	fset.Iterate(iterateFiles)
	return unusedSource, nil
}

func benchmark(fset *token.FileSet, files []*ast.File, full bool) {
	b := testing.Benchmark(func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			conf := Config{IgnoreFuncBodies: !full}
			conf.Check("go/types", fset, files, nil)
		}
	})

	// determine line count
	lineCount := 0
	fset.Iterate(func(f *token.File) bool {
		lineCount += f.LineCount()
		return true
	})

	d := time.Duration(b.NsPerOp())
	fmt.Printf(
		"%s/op, %d lines/s, %d KB/op (%d iterations)\n",
		d,
		int64(float64(lineCount)/d.Seconds()),
		b.AllocedBytesPerOp()>>10,
		b.N,
	)
}