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rewrite.go
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rewrite.go
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package astvisit
import (
"bytes"
"errors"
"fmt"
"go/ast"
"go/token"
"io"
"os"
"path/filepath"
"sort"
"strings"
)
// FileReplacementsFunc is called for a source file by RewriteWithReplacements
// to return NodeReplacements and Imports that will be applied to the source file.
type FileReplacementsFunc func(fset *token.FileSet, pkg *ast.Package, astFile *ast.File, filePath string, verboseOut io.Writer) (NodeReplacements, Imports, error)
func RewriteWithReplacements(path string, verboseOut, resultOut io.Writer, debug bool, fileReplacementsFunc FileReplacementsFunc) error {
if fileReplacementsFunc == nil {
return errors.New("nil fileReplacementsFunc")
}
return Rewrite(path, verboseOut, resultOut, func(fset *token.FileSet, pkg *ast.Package, astFile *ast.File, filePath string, verboseOut io.Writer) ([]byte, error) {
replacements, imports, err := fileReplacementsFunc(fset, pkg, astFile, filePath, verboseOut)
if err != nil {
return nil, err
}
if len(replacements) == 0 {
return nil, nil
}
source, err := os.ReadFile(filePath)
if err != nil {
return nil, err
}
if debug {
return replacements.DebugApply(fset, source)
}
rewritten, err := replacements.Apply(fset, source)
if err != nil {
return nil, err
}
rewritten, err = FormatFileWithImports(fset, rewritten, imports)
if err != nil {
return nil, err
}
if bytes.Equal(source, rewritten) {
return nil, nil
}
return rewritten, nil
})
}
// RewriteFileFunc is called for a source file by Rewrite to return
// the rewritten source or nil if the file should not be changed.
type RewriteFileFunc func(fset *token.FileSet, pkg *ast.Package, astFile *ast.File, filePath string, verboseOut io.Writer) ([]byte, error)
func Rewrite(path string, verboseOut, resultOut io.Writer, rewriteFileFunc RewriteFileFunc) error {
if rewriteFileFunc == nil {
return errors.New("nil rewriteFileFunc")
}
recursive := strings.HasSuffix(path, "...")
if recursive {
path = strings.TrimSuffix(path, "...")
}
path, err := filepath.Abs(path)
if err != nil {
return err
}
pathInfo, err := os.Stat(path)
if err != nil {
return err
}
fset := token.NewFileSet()
// Rewrite single file
if !pathInfo.IsDir() {
pkg, err := ParsePackage(fset, filepath.Dir(path), filterOutTests)
if err != nil {
return err
}
return rewriteFile(fset, pkg, path, verboseOut, resultOut, rewriteFileFunc)
}
// Rewrite directory
pkg, err := ParsePackage(fset, path, filterOutTests)
if err != nil && (!recursive || !errors.Is(err, ErrPackageNotFound)) {
return err
}
if err == nil {
filePaths := make([]string, 0, len(pkg.Files))
for filePath := range pkg.Files {
filePaths = append(filePaths, filePath)
}
sort.Strings(filePaths)
for _, filePath := range filePaths {
err = rewriteFile(fset, pkg, filePath, verboseOut, resultOut, rewriteFileFunc)
if err != nil {
return err
}
}
} else {
err = FprintfVerbose(verboseOut, "%s\n", err)
if err != nil {
return err
}
}
if !recursive {
return nil
}
// Rewrite recursive sub-directories
files, err := os.ReadDir(path)
if err != nil {
return err
}
for _, file := range files {
fileName := file.Name()
if !file.IsDir() || fileName[0] == '.' || fileName == "node_modules" {
continue
}
err = Rewrite(filepath.Join(path, fileName, "..."), verboseOut, resultOut, rewriteFileFunc)
if err != nil {
return err
}
}
return nil
}
func rewriteFile(fset *token.FileSet, pkg *ast.Package, filePath string, verboseOut, resultOut io.Writer, rewriteFileFunc RewriteFileFunc) error {
filePath = filepath.Clean(filePath)
astFile, ok := pkg.Files[filePath]
if !ok {
return fmt.Errorf("package %s has no file %s", pkg.Name, filepath.Base(filePath))
}
err := FprintfVerbose(verboseOut, "parsing file: %s\n", filePath)
if err != nil {
return err
}
rewritten, err := rewriteFileFunc(fset, pkg, astFile, filePath, verboseOut)
if err != nil {
return err
}
if rewritten == nil {
return FprintfVerbose(verboseOut, "no changes in file: %s\n", filePath)
}
err = FprintfVerbose(verboseOut, "changed file: %s\n", filePath)
if err != nil {
return err
}
if resultOut != nil {
_, err = resultOut.Write(rewritten)
return err
}
return os.WriteFile(filePath, rewritten, 0600)
}
func filterOutTests(info os.FileInfo) bool {
if strings.HasSuffix(info.Name(), "_test.go") {
return false
}
return true
}
// FprintfVerbose calls fmt.Fprintf if verboseOut is not nil
func FprintfVerbose(verboseOut io.Writer, format string, args ...any) error {
if verboseOut == nil {
return nil
}
_, err := fmt.Fprintf(verboseOut, format, args...)
return err
}