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i18n.go
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i18n.go
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/*
Copyright 2016 Wenhui Shen <www.webx.top>
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.
*/
package language
import (
"fmt"
"net/http"
"path/filepath"
"strings"
"sync"
"github.com/admpub/i18n"
"github.com/admpub/log"
"github.com/webx-top/com"
"github.com/webx-top/echo"
)
var defaultInstance *I18n
type I18n struct {
*i18n.TranslatorFactory
lock sync.RWMutex
translators map[string]*i18n.Translator
config *Config
}
func fixedPath(ppath string, open func(string) http.FileSystem) string {
if len(ppath) == 0 || filepath.IsAbs(ppath) {
return ppath
}
if open == nil {
open = func(p string) http.FileSystem {
return http.Dir(p)
}
}
fs := open(ppath)
var exists bool
file, err := fs.Open(`.`)
if err == nil {
_, err = file.Stat()
exists = err == nil
file.Close()
}
if exists {
return ppath
}
return filepath.Join(echo.Wd(), ppath)
}
func NewI18n(c *Config) *I18n {
c.Fallback = fixedPath(c.Fallback, c.FSFunc())
for index, value := range c.RulesPath {
c.RulesPath[index] = fixedPath(value, c.FSFunc())
}
for index, value := range c.MessagesPath {
c.MessagesPath[index] = fixedPath(value, c.FSFunc())
}
f, errs := i18n.NewTranslatorFactoryWith(c.Project, c.RulesPath, c.MessagesPath, c.Fallback, c.FSFunc())
if len(errs) > 0 {
var errMsg string
for idx, err := range errs {
if idx > 0 {
errMsg += "\n"
}
errMsg += err.Error()
}
if len(errMsg) > 0 {
panic("== i18n error: " + errMsg + "\n")
}
}
defaultInstance = &I18n{
TranslatorFactory: f,
translators: make(map[string]*i18n.Translator),
config: c,
}
defaultInstance.GetAndCache(c.Default)
return defaultInstance
}
func (a *I18n) Monitor() *I18n {
onchange := func(file string) {
log.Info("reload language: ", file)
defaultInstance.Reload(file)
}
callback := &com.MonitorEvent{
Modify: onchange,
Delete: onchange,
Rename: onchange,
}
callback.Watch(func(f string) bool {
log.Info("changed language: ", f)
return strings.HasSuffix(f, `.yaml`)
})
for _, mp := range a.config.MessagesPath {
if len(mp) == 0 {
continue
}
if err := callback.AddDir(mp); err != nil {
log.Debugf(`failed to I18n.Monitor.AddDir(%q): %v`, mp, err)
}
}
return a
}
func (a *I18n) GetAndCache(langCode string) *i18n.Translator {
var (
t *i18n.Translator
errs []error
)
t, errs = a.TranslatorFactory.GetTranslator(langCode)
if len(errs) > 0 {
if a.config.Default != langCode {
t, errs = a.TranslatorFactory.GetTranslator(a.config.Default)
}
}
if len(errs) > 0 {
var errMsg string
for idx, err := range errs {
if idx > 0 {
errMsg += "\n"
}
errMsg += err.Error()
}
if len(errMsg) > 0 {
panic("== i18n error: " + errMsg + "\n")
}
}
a.lock.Lock()
a.translators[langCode] = t
a.lock.Unlock()
return t
}
func (a *I18n) Reload(langCode string) {
if strings.HasSuffix(langCode, `.yaml`) {
langCode = strings.TrimSuffix(langCode, `.yaml`)
langCode = filepath.Base(langCode)
}
a.TranslatorFactory.Reload(langCode)
a.lock.Lock()
delete(a.translators, langCode)
a.lock.Unlock()
}
func (a *I18n) Get(langCode string) *i18n.Translator {
a.lock.RLock()
t, ok := a.translators[langCode]
a.lock.RUnlock()
if !ok {
t = a.GetAndCache(langCode)
}
return t
}
func (a *I18n) Translate(langCode, key string, args map[string]string) string {
t := a.Get(langCode)
translation, err := t.Translate(key, args)
if err != nil {
return key
}
return translation
}
func (a *I18n) T(langCode, key string, args ...interface{}) (t string) {
if len(args) > 0 {
if v, ok := args[0].(map[string]string); ok {
t = a.Translate(langCode, key, v)
return
}
t = a.Translate(langCode, key, map[string]string{})
t = fmt.Sprintf(t, args...)
return
}
t = a.Translate(langCode, key, map[string]string{})
return
}
// T 多语言翻译
func T(langCode, key string, args ...interface{}) (t string) {
if defaultInstance == nil {
t = key
if len(args) > 0 {
t = fmt.Sprintf(t, args...)
}
return
}
t = defaultInstance.T(langCode, key, args...)
return
}