ebiten/cmd/ebitenmobile/gobind.go

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// Copyright 2019 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 ebitenmobilegobind
// gobind is a wrapper of the original gobind. This command adds extra files like a view controller.
package main
import (
_ "embed"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
"golang.org/x/tools/go/packages"
)
//go:embed _files/EbitenViewController.m
var objcM string
//go:embed _files/EbitenView.java
var viewJava string
//go:embed _files/EbitenSurfaceView.java
var surfaceViewJava string
var (
lang = flag.String("lang", "", "")
outdir = flag.String("outdir", "", "")
javaPkg = flag.String("javapkg", "", "")
prefix = flag.String("prefix", "", "")
bootclasspath = flag.String("bootclasspath", "", "")
classpath = flag.String("classpath", "", "")
tags = flag.String("tags", "", "")
)
var usage = `The Gobind tool generates Java language bindings for Go.
For usage details, see doc.go.`
func main() {
flag.Parse()
if err := run(); err != nil {
log.Fatal(err)
}
}
func invokeOriginalGobind(lang string) (pkgName string, err error) {
cmd := exec.Command("gobind-original", os.Args[1:]...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return "", err
}
cfgtags := strings.Join(strings.Split(*tags, ","), " ")
cfg := &packages.Config{}
switch lang {
case "java":
cfg.Env = append(os.Environ(), "GOOS=android")
case "objc":
cfg.Env = append(os.Environ(), "GOOS=darwin")
if cfgtags != "" {
cfgtags += " "
}
cfgtags += "ios"
}
cfg.BuildFlags = []string{"-tags", cfgtags}
pkgs, err := packages.Load(cfg, flag.Args()[0])
if err != nil {
return "", err
}
return pkgs[0].Name, nil
}
func run() error {
writeFile := func(filename string, content string) error {
if err := os.WriteFile(filepath.Join(*outdir, filename), []byte(content), 0644); err != nil {
return err
}
return nil
}
// Add additional files.
langs := strings.Split(*lang, ",")
for _, lang := range langs {
pkgName, err := invokeOriginalGobind(lang)
if err != nil {
return err
}
prefixLower := *prefix + pkgName
prefixUpper := strings.Title(*prefix) + strings.Title(pkgName)
replacePrefixes := func(content string) string {
content = strings.ReplaceAll(content, "{{.PrefixUpper}}", prefixUpper)
content = strings.ReplaceAll(content, "{{.PrefixLower}}", prefixLower)
content = strings.ReplaceAll(content, "{{.JavaPkg}}", *javaPkg)
return content
}
switch lang {
case "objc":
// iOS
if err := writeFile(filepath.Join("src", "gobind", prefixLower+"ebitenviewcontroller_ios.m"), replacePrefixes(objcM)); err != nil {
return err
}
if err := writeFile(filepath.Join("src", "gobind", prefixLower+"ebitenviewcontroller_ios.go"), `package main
// #cgo CFLAGS: -DGLES_SILENCE_DEPRECATION
import "C"`); err != nil {
return err
}
case "java":
// Android
dir := filepath.Join(strings.Split(*javaPkg, ".")...)
dir = filepath.Join(dir, prefixLower)
if err := writeFile(filepath.Join("java", dir, "EbitenView.java"), replacePrefixes(viewJava)); err != nil {
return err
}
if err := writeFile(filepath.Join("java", dir, "EbitenSurfaceView.java"), replacePrefixes(surfaceViewJava)); err != nil {
return err
}
case "go":
// Do nothing.
default:
panic(fmt.Sprintf("unsupported language: %s", lang))
}
}
return nil
}