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- // Copyright 2018 The Ebiten Authors
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- //go:build ignore
- package main
- import (
- "bufio"
- "fmt"
- "go/ast"
- "go/format"
- "go/parser"
- "go/token"
- "os"
- "os/exec"
- "path/filepath"
- "regexp"
- "runtime"
- "strconv"
- "strings"
- "golang.org/x/tools/go/ast/astutil"
- )
- func pngDir() (string, error) {
- dir, err := exec.Command("go", "list", "-f", "{{.Dir}}", "image/png").Output()
- if err != nil {
- return "", err
- }
- return strings.TrimSpace(string(dir)), nil
- }
- func pngFiles() ([]string, error) {
- files, err := exec.Command("go", "list", "-f", `{{join .GoFiles ","}}`, "image/png").Output()
- if err != nil {
- return nil, err
- }
- return strings.Split(strings.TrimSpace(string(files)), ","), nil
- }
- func run() error {
- reVer := regexp.MustCompile(`^go1\.(\d+)(\.\d+)?$`)
- verStr := runtime.Version()
- m := reVer.FindStringSubmatch(verStr)
- if m == nil {
- return fmt.Errorf("png: unexpected Go version: %s", verStr)
- }
- ver, err := strconv.Atoi(m[1])
- if err != nil {
- return err
- }
- if ver < 22 {
- return fmt.Errorf("png: use Go 1.22 or newer")
- }
- dir, err := pngDir()
- if err != nil {
- return err
- }
- files, err := pngFiles()
- if err != nil {
- return err
- }
- const prefix = "stdlib"
- matches, err := filepath.Glob(prefix + "*.go")
- if err != nil {
- return err
- }
- for _, f := range matches {
- if err := os.Remove(f); err != nil {
- return err
- }
- }
- for _, f := range files {
- out, err := os.Create(prefix + f)
- if err != nil {
- return err
- }
- defer out.Close()
- w := bufio.NewWriter(out)
- // TODO: Remove call of RegisterDecoder
- data, err := os.ReadFile(filepath.Join(dir, f))
- if err != nil {
- return err
- }
- fset := token.NewFileSet()
- tree, err := parser.ParseFile(fset, "", string(data), parser.ParseComments)
- if err != nil {
- return err
- }
- astutil.Apply(tree, func(c *astutil.Cursor) bool {
- stmt, ok := c.Node().(*ast.ExprStmt)
- if !ok {
- return true
- }
- call, ok := stmt.X.(*ast.CallExpr)
- if !ok {
- return true
- }
- s, ok := call.Fun.(*ast.SelectorExpr)
- if !ok {
- return true
- }
- receiver, ok := s.X.(*ast.Ident)
- if !ok {
- return true
- }
- // Delete registering PNG format.
- if receiver.Name == "image" && s.Sel.Name == "RegisterFormat" {
- c.Delete()
- }
- return true
- }, nil)
- fmt.Fprintln(w, "// Code generated by gen.go. DO NOT EDIT.")
- fmt.Fprintln(w)
- format.Node(w, fset, tree)
- if err := w.Flush(); err != nil {
- return err
- }
- }
- return nil
- }
- func main() {
- if err := run(); err != nil {
- panic(err)
- }
- }
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