mirror of
https://github.com/miniflux/v2.git
synced 2024-09-12 05:57:57 +02:00
315 lines
7.3 KiB
Go
315 lines
7.3 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pipeline
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import (
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"fmt"
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"go/build"
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"io"
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"path/filepath"
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"regexp"
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"sort"
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"strings"
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"text/template"
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"golang.org/x/text/collate"
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"golang.org/x/text/feature/plural"
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"golang.org/x/text/internal"
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"golang.org/x/text/internal/catmsg"
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"golang.org/x/text/internal/gen"
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"golang.org/x/text/language"
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"golang.org/x/tools/go/loader"
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)
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var transRe = regexp.MustCompile(`messages\.(.*)\.json`)
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// Generate writes a Go file that defines a Catalog with translated messages.
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func (s *State) Generate() error {
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path := s.Config.GenPackage
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if path == "" {
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path = "."
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}
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isDir := path[0] == '.'
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prog, err := loadPackages(&loader.Config{}, []string{path})
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if err != nil {
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return wrap(err, "could not load package")
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}
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pkgs := prog.InitialPackages()
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if len(pkgs) != 1 {
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return errorf("more than one package selected: %v", pkgs)
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}
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pkg := pkgs[0].Pkg.Name()
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cw, err := s.generate()
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if err != nil {
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return err
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}
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if !isDir {
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gopath := build.Default.GOPATH
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path = filepath.Join(gopath, filepath.FromSlash(pkgs[0].Pkg.Path()))
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}
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path = filepath.Join(path, s.Config.GenFile)
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cw.WriteGoFile(path, pkg) // TODO: WriteGoFile should return error.
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return err
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}
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// WriteGen writes a Go file with the given package name to w that defines a
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// Catalog with translated messages.
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func (s *State) WriteGen(w io.Writer, pkg string) error {
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cw, err := s.generate()
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if err != nil {
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return err
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}
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_, err = cw.WriteGo(w, pkg, "")
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return err
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}
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// Generate is deprecated; use (*State).Generate().
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func Generate(w io.Writer, pkg string, extracted *Messages, trans ...Messages) (n int, err error) {
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s := State{
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Extracted: *extracted,
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Translations: trans,
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}
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cw, err := s.generate()
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if err != nil {
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return 0, err
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}
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return cw.WriteGo(w, pkg, "")
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}
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func (s *State) generate() (*gen.CodeWriter, error) {
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// TODO: add in external input. Right now we assume that all files are
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// manually created and stored in the textdata directory.
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// Build up index of translations and original messages.
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translations := map[language.Tag]map[string]Message{}
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languages := []language.Tag{}
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langVars := []string{}
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usedKeys := map[string]int{}
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for _, loc := range s.Translations {
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tag := loc.Language
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if _, ok := translations[tag]; !ok {
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translations[tag] = map[string]Message{}
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languages = append(languages, tag)
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}
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for _, m := range loc.Messages {
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if !m.Translation.IsEmpty() {
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for _, id := range m.ID {
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if _, ok := translations[tag][id]; ok {
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warnf("Duplicate translation in locale %q for message %q", tag, id)
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}
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translations[tag][id] = m
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}
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}
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}
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}
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// Verify completeness and register keys.
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internal.SortTags(languages)
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for _, tag := range languages {
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langVars = append(langVars, strings.Replace(tag.String(), "-", "_", -1))
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dict := translations[tag]
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for _, msg := range s.Extracted.Messages {
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for _, id := range msg.ID {
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if trans, ok := dict[id]; ok && !trans.Translation.IsEmpty() {
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if _, ok := usedKeys[msg.Key]; !ok {
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usedKeys[msg.Key] = len(usedKeys)
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}
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break
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}
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// TODO: log missing entry.
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warnf("%s: Missing entry for %q.", tag, id)
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}
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}
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}
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cw := gen.NewCodeWriter()
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x := &struct {
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Fallback language.Tag
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Languages []string
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}{
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Fallback: s.Extracted.Language,
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Languages: langVars,
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}
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if err := lookup.Execute(cw, x); err != nil {
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return nil, wrap(err, "error")
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}
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keyToIndex := []string{}
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for k := range usedKeys {
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keyToIndex = append(keyToIndex, k)
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}
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sort.Strings(keyToIndex)
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fmt.Fprint(cw, "var messageKeyToIndex = map[string]int{\n")
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for _, k := range keyToIndex {
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fmt.Fprintf(cw, "%q: %d,\n", k, usedKeys[k])
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}
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fmt.Fprint(cw, "}\n\n")
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for i, tag := range languages {
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dict := translations[tag]
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a := make([]string, len(usedKeys))
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for _, msg := range s.Extracted.Messages {
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for _, id := range msg.ID {
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if trans, ok := dict[id]; ok && !trans.Translation.IsEmpty() {
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m, err := assemble(&msg, &trans.Translation)
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if err != nil {
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return nil, wrap(err, "error")
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}
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_, leadWS, trailWS := trimWS(msg.Key)
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if leadWS != "" || trailWS != "" {
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m = catmsg.Affix{
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Message: m,
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Prefix: leadWS,
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Suffix: trailWS,
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}
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}
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// TODO: support macros.
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data, err := catmsg.Compile(tag, nil, m)
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if err != nil {
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return nil, wrap(err, "error")
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}
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key := usedKeys[msg.Key]
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if d := a[key]; d != "" && d != data {
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warnf("Duplicate non-consistent translation for key %q, picking the one for message %q", msg.Key, id)
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}
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a[key] = string(data)
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break
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}
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}
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}
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index := []uint32{0}
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p := 0
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for _, s := range a {
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p += len(s)
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index = append(index, uint32(p))
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}
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cw.WriteVar(langVars[i]+"Index", index)
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cw.WriteConst(langVars[i]+"Data", strings.Join(a, ""))
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}
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return cw, nil
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}
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func assemble(m *Message, t *Text) (msg catmsg.Message, err error) {
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keys := []string{}
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for k := range t.Var {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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var a []catmsg.Message
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for _, k := range keys {
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t := t.Var[k]
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m, err := assemble(m, &t)
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if err != nil {
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return nil, err
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}
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a = append(a, &catmsg.Var{Name: k, Message: m})
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}
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if t.Select != nil {
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s, err := assembleSelect(m, t.Select)
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if err != nil {
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return nil, err
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}
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a = append(a, s)
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}
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if t.Msg != "" {
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sub, err := m.Substitute(t.Msg)
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if err != nil {
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return nil, err
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}
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a = append(a, catmsg.String(sub))
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}
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switch len(a) {
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case 0:
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return nil, errorf("generate: empty message")
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case 1:
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return a[0], nil
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default:
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return catmsg.FirstOf(a), nil
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}
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}
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func assembleSelect(m *Message, s *Select) (msg catmsg.Message, err error) {
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cases := []string{}
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for c := range s.Cases {
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cases = append(cases, c)
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}
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sortCases(cases)
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caseMsg := []interface{}{}
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for _, c := range cases {
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cm := s.Cases[c]
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m, err := assemble(m, &cm)
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if err != nil {
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return nil, err
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}
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caseMsg = append(caseMsg, c, m)
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}
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ph := m.Placeholder(s.Arg)
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switch s.Feature {
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case "plural":
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// TODO: only printf-style selects are supported as of yet.
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return plural.Selectf(ph.ArgNum, ph.String, caseMsg...), nil
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}
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return nil, errorf("unknown feature type %q", s.Feature)
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}
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func sortCases(cases []string) {
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// TODO: implement full interface.
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sort.Slice(cases, func(i, j int) bool {
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if cases[j] == "other" && cases[i] != "other" {
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return true
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}
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// the following code relies on '<' < '=' < any letter.
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return cmpNumeric(cases[i], cases[j]) == -1
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})
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}
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var cmpNumeric = collate.New(language.Und, collate.Numeric).CompareString
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var lookup = template.Must(template.New("gen").Parse(`
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import (
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"golang.org/x/text/language"
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"golang.org/x/text/message"
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"golang.org/x/text/message/catalog"
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)
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type dictionary struct {
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index []uint32
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data string
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}
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func (d *dictionary) Lookup(key string) (data string, ok bool) {
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p := messageKeyToIndex[key]
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start, end := d.index[p], d.index[p+1]
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if start == end {
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return "", false
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}
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return d.data[start:end], true
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}
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func init() {
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dict := map[string]catalog.Dictionary{
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{{range .Languages}}"{{.}}": &dictionary{index: {{.}}Index, data: {{.}}Data },
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{{end}}
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}
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fallback := language.MustParse("{{.Fallback}}")
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cat, err := catalog.NewFromMap(dict, catalog.Fallback(fallback))
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if err != nil {
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panic(err)
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}
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message.DefaultCatalog = cat
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}
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`))
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