/
gofmt.go
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/
gofmt.go
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// Copyright 2009 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 was copied from the src/cmd/gofmt/gofmt.go
// but processFile function is modified
package main
import (
"bytes"
"errors"
"flag"
"fmt"
"go/ast"
"go/parser"
"go/printer"
"go/scanner"
"go/token"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"regexp"
"runtime"
"runtime/pprof"
"strconv"
"strings"
)
var (
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from tagfmt's")
align = flag.Bool("a", true, "align with nearby field's tag")
write = flag.Bool("w", false, "write result to (source) file instead of stdout")
tagSort = flag.Bool("s", false, "sort struct tag by key")
tagSortOrder = flag.String("so", "", "sort struct tag keys order e.g json|yaml|desc")
tagSortWeight = flag.String("sw", "", "sort struct tag keys weight e.g json=1|yaml=2|desc=-1 the higher weight, the higher the ranking, default keys weight is 0")
doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
allErrors = flag.Bool("e", false, "report all errors (not just the first 10 on different lines)")
fill = flag.String("f", "", "fill key and value for field e.g json=lower(_val)|yaml=snake(_val)")
pattern = flag.String("p", ".*", "field name with regular expression pattern")
inversePattern = flag.String("P", "", "field name with inverse regular expression pattern")
structPattern = flag.String("sp", ".*", "struct name with regular expression pattern")
inverseStructPattern = flag.String("sP", "", "struct name with inverse regular expression pattern")
// debugging
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to this file")
)
func resetFlags() {
*list = false
*align = true
*write = false
*tagSort = false
*tagSortOrder = ""
*doDiff = false
*allErrors = false
*fill = ""
*pattern = ".*"
*inversePattern = ""
*structPattern = ".*"
*inverseStructPattern = ""
*cpuprofile = ""
}
const (
tabWidth = 8
printerMode = printer.UseSpaces | printer.TabIndent
)
var (
fileSet = token.NewFileSet() // per process FileSet
exitCode = 0
parserMode parser.Mode
)
// error define
var (
ErrUnclosedQuote = errors.New("unclosed quote")
ErrUnclosedBracket = errors.New("unclosed bracket")
ErrInvalidTag = errors.New("Invalid tag ")
)
func NewAstError(fs *token.FileSet, n ast.Node, err error) error {
s := fs.Position(n.Pos())
return fmt.Errorf("%s:%d %s", filepath.Base(s.Filename), s.Line, err)
}
func report(err error) {
scanner.PrintError(os.Stderr, err)
exitCode = 2
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: tagfmt [flags] [path ...]\n")
flag.PrintDefaults()
}
func initParserMode() {
parserMode = parser.ParseComments
if *allErrors {
parserMode |= parser.AllErrors
}
}
func isGoFile(f os.FileInfo) bool {
// ignore non-Go files
name := f.Name()
return !f.IsDir() && !strings.HasPrefix(name, ".") && strings.HasSuffix(name, ".go")
}
// If in == nil, the source is the contents of the file with the given filename.
func processFile(filename string, in io.Reader, out io.Writer, stdin bool) error {
var perm os.FileMode = 0644
if in == nil {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
in = f
perm = fi.Mode().Perm()
}
if *inversePattern != "" {
err := selectInit(*inversePattern, true)
if err != nil {
return err
}
} else {
err := selectInit(*pattern, false)
if err != nil {
return err
}
}
if *inverseStructPattern != "" {
err := structSelectInit(*inverseStructPattern, true)
if err != nil {
return err
}
} else {
err := structSelectInit(*structPattern, false)
if err != nil {
return err
}
}
src, err := ioutil.ReadAll(in)
if err != nil {
return err
}
file, err := parser.ParseFile(fileSet, filename, src, parserMode)
if err != nil {
return err
}
var executor []Executor
executor = append(executor, &tagDoctor{
f: file,
fs: fileSet,
})
if *fill != "" {
filler, err := newTagFill(file, fileSet, *fill)
if err != nil {
return err
}
executor = append(executor, filler)
}
if *tagSort {
weights := map[string]int{}
for _, weightStr := range strings.Split(*tagSortWeight, "|") {
weightStr = strings.TrimSpace(weightStr)
if strings.TrimSpace(weightStr) == "" {
continue
}
keyVals := strings.Split(weightStr, "=")
if len(keyVals) != 2 {
return errors.New("tagSortWeight format error please check 'sw' arg")
}
key := strings.TrimSpace(keyVals[0])
val, err := strconv.Atoi(strings.TrimSpace(keyVals[1]))
if err != nil {
return errors.New("tagSortWeight format error please check 'sw' arg: " + err.Error())
}
weights[key] = val
}
executor = append(executor, newTagSort(file, fileSet, strings.Split(*tagSortOrder, "|"), weights))
}
if *align {
executor = append(executor, newTagFmt(file, fileSet))
}
for _, scan := range executor {
err := scan.Scan()
if err != nil {
return err
}
}
for _, exe := range executor {
err := exe.Execute()
if err != nil {
return err
}
}
var buf bytes.Buffer
cfg := printer.Config{Mode: printerMode, Tabwidth: tabWidth}
err = cfg.Fprint(&buf, fileSet, file)
if err != nil {
return err
}
res := buf.Bytes()
if !bytes.Equal(src, res) {
// formatting has changed
if *list {
fmt.Fprintln(out, filename)
}
if *write {
// make a temporary backup before overwriting original
bakname, err := backupFile(filename+".", src, perm)
if err != nil {
return err
}
err = ioutil.WriteFile(filename, res, perm)
if err != nil {
os.Rename(bakname, filename)
return err
}
err = os.Remove(bakname)
if err != nil {
return err
}
}
if *doDiff {
data, err := diff(src, res, filename)
if err != nil {
return fmt.Errorf("computing diff: %s", err)
}
fmt.Printf("diff -u %s %s\n", filepath.ToSlash(filename+".orig"), filepath.ToSlash(filename))
out.Write(data)
}
}
if !*list && !*write && !*doDiff {
_, err = out.Write(res)
}
return err
}
func visitFile(path string, f os.FileInfo, err error) error {
if err == nil && isGoFile(f) {
err = processFile(path, nil, os.Stdout, false)
}
// Don't complain if a file was deleted in the meantime (i.e.
// the directory changed concurrently while running gofmt).
if err != nil && !os.IsNotExist(err) {
report(err)
}
return nil
}
func walkDir(path string) {
filepath.Walk(path, visitFile)
}
func main() {
// call gofmtMain in a separate function
// so that it can use defer and have them
// run before the exit.
gofmtMain()
os.Exit(exitCode)
}
func gofmtMain() {
flag.Usage = usage
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
fmt.Fprintf(os.Stderr, "creating cpu profile: %s\n", err)
exitCode = 2
return
}
defer f.Close()
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
initParserMode()
if flag.NArg() == 0 {
if *write {
fmt.Fprintln(os.Stderr, "error: cannot use -w with standard input")
exitCode = 2
return
}
if err := processFile("<standard input>", os.Stdin, os.Stdout, true); err != nil {
report(err)
}
return
}
for i := 0; i < flag.NArg(); i++ {
path := flag.Arg(i)
switch dir, err := os.Stat(path); {
case err != nil:
report(err)
case dir.IsDir():
walkDir(path)
default:
if err := processFile(path, nil, os.Stdout, false); err != nil {
report(err)
}
}
}
}
func writeTempFile(dir, prefix string, data []byte) (string, error) {
file, err := ioutil.TempFile(dir, prefix)
if err != nil {
return "", err
}
_, err = file.Write(data)
if err1 := file.Close(); err == nil {
err = err1
}
if err != nil {
os.Remove(file.Name())
return "", err
}
return file.Name(), nil
}
func diff(b1, b2 []byte, filename string) (data []byte, err error) {
f1, err := writeTempFile("", "gofmt", b1)
if err != nil {
return
}
defer os.Remove(f1)
f2, err := writeTempFile("", "gofmt", b2)
if err != nil {
return
}
defer os.Remove(f2)
cmd := "diff"
if runtime.GOOS == "plan9" {
cmd = "/bin/ape/diff"
}
data, err = exec.Command(cmd, "-u", f1, f2).CombinedOutput()
if len(data) > 0 {
// diff exits with a non-zero status when the files don't match.
// Ignore that failure as long as we get output.
return replaceTempFilename(data, filename)
}
return
}
// replaceTempFilename replaces temporary filenames in diff with actual one.
//
// --- /tmp/gofmt316145376 2017-02-03 19:13:00.280468375 -0500
// +++ /tmp/gofmt617882815 2017-02-03 19:13:00.280468375 -0500
// ...
// ->
// --- path/to/file.go.orig 2017-02-03 19:13:00.280468375 -0500
// +++ path/to/file.go 2017-02-03 19:13:00.280468375 -0500
// ...
func replaceTempFilename(diff []byte, filename string) ([]byte, error) {
bs := bytes.SplitN(diff, []byte{'\n'}, 3)
if len(bs) < 3 {
return nil, fmt.Errorf("got unexpected diff for %s", filename)
}
// Preserve timestamps.
var t0, t1 []byte
if i := bytes.LastIndexByte(bs[0], '\t'); i != -1 {
t0 = bs[0][i:]
}
if i := bytes.LastIndexByte(bs[1], '\t'); i != -1 {
t1 = bs[1][i:]
}
// Always print filepath with slash separator.
f := filepath.ToSlash(filename)
bs[0] = []byte(fmt.Sprintf("--- %s%s", f+".orig", t0))
bs[1] = []byte(fmt.Sprintf("+++ %s%s", f, t1))
return bytes.Join(bs, []byte{'\n'}), nil
}
const chmodSupported = runtime.GOOS != "windows"
// backupFile writes data to a new file named filename<number> with permissions perm,
// with <number randomly chosen such that the file name is unique. backupFile returns
// the chosen file name.
func backupFile(filename string, data []byte, perm os.FileMode) (string, error) {
// create backup file
f, err := ioutil.TempFile(filepath.Dir(filename), filepath.Base(filename))
if err != nil {
return "", err
}
bakname := f.Name()
if chmodSupported {
err = f.Chmod(perm)
if err != nil {
f.Close()
os.Remove(bakname)
return bakname, err
}
}
// write data to backup file
_, err = f.Write(data)
if err1 := f.Close(); err == nil {
err = err1
}
return bakname, err
}
// change field's tag will cause the token.Pos wrong
// so I make all token.Pos step in Scan and field's tag change in Execute
type Executor interface {
Scan() error
Execute() error
}
var fieldFilter func(s string) bool
func selectInit(expr string, inverse bool) error {
var err error
selRule, err := regexp.Compile(expr)
if err != nil {
return err
}
if inverse {
fieldFilter = func(s string) bool {
return !selRule.MatchString(s)
}
} else {
fieldFilter = func(s string) bool {
return selRule.MatchString(s)
}
}
return nil
}
var structFieldSelect func(s string) bool
func structSelectInit(expr string, inverse bool) error {
var err error
selRule, err := regexp.Compile(expr)
if err != nil {
return err
}
if inverse {
structFieldSelect = func(s string) bool {
return !selRule.MatchString(s)
}
} else {
structFieldSelect = func(s string) bool {
return selRule.MatchString(s)
}
}
return nil
}