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// Copyright 2020 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"go/ast"
"go/importer"
"go/parser"
"go/token"
"go/types"
"log"
"path/filepath"
"strings"
"time"
"github.com/chai2010/gettext-go/po"
)
type Package struct {
path string
pkgpath string
pkgname string
filesAbspath []string
fset *token.FileSet
astFiles []*ast.File
typesInfo *types.Info
typesPackage *types.Package
potFile *po.File
}
func LoadPackage(path string) *Package {
p := &Package{
path: path,
pkgpath: gopkgPath(path),
pkgname: gopkgName(path),
filesAbspath: gopkgFilesAbspath(path),
}
var fset = token.NewFileSet()
var astFiles = make([]*ast.File, len(p.filesAbspath))
for i, path := range p.filesAbspath {
f, err := parser.ParseFile(fset, path, nil, 0)
if err != nil {
log.Fatal(err)
}
astFiles[i] = f
}
// https://github.com/golang/go/issues/26504
typesConfig := &types.Config{
Importer: importer.For("source", nil),
FakeImportC: true,
}
typesInfo := &types.Info{
Types: make(map[ast.Expr]types.TypeAndValue),
Defs: make(map[*ast.Ident]types.Object),
Uses: make(map[*ast.Ident]types.Object),
Selections: make(map[*ast.SelectorExpr]*types.Selection),
}
typesPackage, err := typesConfig.Check(p.pkgname, fset, astFiles, typesInfo)
if err != nil {
log.Fatal(err)
}
p.fset = fset
p.astFiles = astFiles
p.typesInfo = typesInfo
p.typesPackage = typesPackage
return p
}
func (p *Package) GenPotFile() *po.File {
p.potFile = &po.File{
MimeHeader: po.Header{
Comment: po.Comment{
TranslatorComment: "" +
fmt.Sprintf("package: %s\n\n", p.pkgpath) +
"Generated By gettext-go" + "\n" +
"https://github.com/chai2010/gettext-go" + "\n",
},
ProjectIdVersion: "1.0",
POTCreationDate: time.Now().Format("2006-01-02 15:04-0700"),
LanguageTeam: "golang-china",
Language: "zh_CN",
MimeVersion: "MIME-Version: 1.0",
ContentType: "Content-Type: text/plain; charset=UTF-8",
ContentTransferEncoding: "Content-Transfer-Encoding: 8bit",
},
}
for _, f := range p.astFiles {
ast.Inspect(f, func(n ast.Node) bool {
switch x := n.(type) {
case *ast.CallExpr:
switch sel := x.Fun.(type) {
case *ast.SelectorExpr:
if p.isGettextPackage(sel.X) {
p.processGettext(x, sel.Sel.Name)
}
}
}
return true
})
}
return p.potFile
}
func (p *Package) isGettextPackage(node ast.Node) bool {
inner := p.typesPackage.Scope().Innermost(node.Pos())
if ident, ok := node.(*ast.Ident); ok {
if _, obj := inner.LookupParent(ident.Name, node.Pos()); obj != nil {
if pkgName, ok := obj.(*types.PkgName); ok {
if pkg := pkgName.Imported(); pkg != nil {
if pkg.Path() == "github.com/chai2010/gettext-go" {
return true
}
}
}
}
}
return false
}
func (p *Package) processGettext(x *ast.CallExpr, fnName string) {
switch fnName {
case "Gettext": // Gettext(msgid string) string
pos := p.fset.Position(x.Pos())
p.potFile.Messages = append(p.potFile.Messages, po.Message{
Comment: po.Comment{
ReferenceFile: []string{p.pkgpath + "/" + filepath.Base(pos.Filename)},
ReferenceLine: []int{pos.Line},
Flags: []string{"go-format"},
},
MsgContext: "",
MsgId: p.evalStringValue(x.Args[0]),
})
case "PGettext": // PGettext(msgctxt, msgid string) string
pos := p.fset.Position(x.Pos())
p.potFile.Messages = append(p.potFile.Messages, po.Message{
Comment: po.Comment{
ReferenceFile: []string{p.pkgpath + "/" + filepath.Base(pos.Filename)},
ReferenceLine: []int{pos.Line},
Flags: []string{"go-format"},
},
MsgContext: p.evalStringValue(x.Args[0]),
MsgId: p.evalStringValue(x.Args[1]),
})
case "NGettext": // NGettext(msgid, msgidPlural string, n int) string
// TODO
case "PNGettext": // PNGettext(msgctxt, msgid, msgidPlural string, n int) string
// TODO
case "DGettext": // DGettext(domain, msgid string) string
// TODO
case "DPGettext": // DPGettext(domain, msgctxt, msgid string) string
// TODO
case "DNGettext": // DNGettext(domain, msgid, msgidPlural string, n int) string
// TODO
case "DPNGettext": // DPNGettext(domain, msgctxt, msgid, msgidPlural string, n int) string
// TODO
}
}
func (p *Package) evalStringValue(val interface{}) string {
switch val.(type) {
case *ast.BasicLit:
s := val.(*ast.BasicLit).Value
s = strings.TrimSpace(s)
s = strings.Trim(s, `"`+"\n")
return s
case *ast.BinaryExpr:
if val.(*ast.BinaryExpr).Op != token.ADD {
return ""
}
left := p.evalStringValue(val.(*ast.BinaryExpr).X)
right := p.evalStringValue(val.(*ast.BinaryExpr).Y)
return left[0:len(left)-1] + right[1:len(right)]
default:
panic(fmt.Sprintf("unknown type: %v", val))
}
}
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