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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package catalog
import (
"sync"
"golang.org/x/text/internal"
"golang.org/x/text/internal/catmsg"
"golang.org/x/text/language"
)
// TODO:
// Dictionary returns a Dictionary that returns the first Message, using the
// given language tag, that matches:
// 1. the last one registered by one of the Set methods
// 2. returned by one of the Loaders
// 3. repeat from 1. using the parent language
// This approach allows messages to be underspecified.
// func (c *Catalog) Dictionary(tag language.Tag) (Dictionary, error) {
// // TODO: verify dictionary exists.
// return &dict{&c.index, tag}, nil
// }
type dict struct {
s *store
tag language.Tag // TODO: make compact tag.
}
func (d *dict) Lookup(key string) (data string, ok bool) {
return d.s.lookup(d.tag, key)
}
func (b *Builder) lookup(tag language.Tag, key string) (data string, ok bool) {
return b.index.lookup(tag, key)
}
func (c *Builder) set(tag language.Tag, key string, s *store, msg ...Message) error {
data, err := catmsg.Compile(tag, &dict{&c.macros, tag}, firstInSequence(msg))
s.mutex.Lock()
defer s.mutex.Unlock()
m := s.index[tag]
if m == nil {
m = msgMap{}
if s.index == nil {
s.index = map[language.Tag]msgMap{}
}
c.matcher = nil
s.index[tag] = m
}
m[key] = data
return err
}
func (c *Builder) Matcher() language.Matcher {
c.index.mutex.RLock()
m := c.matcher
c.index.mutex.RUnlock()
if m != nil {
return m
}
c.index.mutex.Lock()
if c.matcher == nil {
c.matcher = language.NewMatcher(c.unlockedLanguages())
}
m = c.matcher
c.index.mutex.Unlock()
return m
}
type store struct {
mutex sync.RWMutex
index map[language.Tag]msgMap
}
type msgMap map[string]string
func (s *store) lookup(tag language.Tag, key string) (data string, ok bool) {
s.mutex.RLock()
defer s.mutex.RUnlock()
for ; ; tag = tag.Parent() {
if msgs, ok := s.index[tag]; ok {
if msg, ok := msgs[key]; ok {
return msg, true
}
}
if tag == language.Und {
break
}
}
return "", false
}
// Languages returns all languages for which the Catalog contains variants.
func (b *Builder) Languages() []language.Tag {
s := &b.index
s.mutex.RLock()
defer s.mutex.RUnlock()
return b.unlockedLanguages()
}
func (b *Builder) unlockedLanguages() []language.Tag {
s := &b.index
if len(s.index) == 0 {
return nil
}
tags := make([]language.Tag, 0, len(s.index))
_, hasFallback := s.index[b.options.fallback]
offset := 0
if hasFallback {
tags = append(tags, b.options.fallback)
offset = 1
}
for t := range s.index {
if t != b.options.fallback {
tags = append(tags, t)
}
}
internal.SortTags(tags[offset:])
return tags
}