305 lines
8.3 KiB
Go
305 lines
8.3 KiB
Go
/*
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* Copyright (c) 2018 DeineAgentur UG https://www.deineagentur.com. All rights reserved.
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* Licensed under the MIT License. See LICENSE file in the project root for full license information.
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*/
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package gotext
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import (
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"bytes"
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"encoding/gob"
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"os"
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"path"
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"sync"
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)
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/*
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Locale wraps the entire i18n collection for a single language (locale)
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It's used by the package functions, but it can also be used independently to handle
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multiple languages at the same time by working with this object.
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Example:
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import (
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"encoding/gob"
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"bytes"
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"fmt"
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"github.com/leonelquinteros/gotext"
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)
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func main() {
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// Create Locale with library path and language code
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l := gotext.NewLocale("/path/to/i18n/dir", "en_US")
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// Load domain '/path/to/i18n/dir/en_US/LC_MESSAGES/default.{po,mo}'
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l.AddDomain("default")
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// Translate text from default domain
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fmt.Println(l.Get("Translate this"))
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// Load different domain ('/path/to/i18n/dir/en_US/LC_MESSAGES/extras.{po,mo}')
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l.AddDomain("extras")
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// Translate text from domain
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fmt.Println(l.GetD("extras", "Translate this"))
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}
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*/
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type Locale struct {
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// Path to locale files.
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path string
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// Language for this Locale
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lang string
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// List of available Domains for this locale.
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Domains map[string]Translator
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// First AddDomain is default Domain
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defaultDomain string
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// Sync Mutex
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sync.RWMutex
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}
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// NewLocale creates and initializes a new Locale object for a given language.
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// It receives a path for the i18n .po/.mo files directory (p) and a language code to use (l).
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func NewLocale(p, l string) *Locale {
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return &Locale{
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path: p,
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lang: SimplifiedLocale(l),
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Domains: make(map[string]Translator),
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}
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}
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func (l *Locale) findExt(dom, ext string) string {
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filename := path.Join(l.path, l.lang, "LC_MESSAGES", dom+"."+ext)
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if _, err := os.Stat(filename); err == nil {
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return filename
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}
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if len(l.lang) > 2 {
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filename = path.Join(l.path, l.lang[:2], "LC_MESSAGES", dom+"."+ext)
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if _, err := os.Stat(filename); err == nil {
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return filename
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}
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}
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filename = path.Join(l.path, l.lang, dom+"."+ext)
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if _, err := os.Stat(filename); err == nil {
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return filename
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}
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if len(l.lang) > 2 {
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filename = path.Join(l.path, l.lang[:2], dom+"."+ext)
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if _, err := os.Stat(filename); err == nil {
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return filename
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}
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}
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return ""
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}
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// AddDomain creates a new domain for a given locale object and initializes the Po object.
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// If the domain exists, it gets reloaded.
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func (l *Locale) AddDomain(dom string) {
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var poObj Translator
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file := l.findExt(dom, "po")
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if file != "" {
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poObj = new(Po)
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// Parse file.
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poObj.ParseFile(file)
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} else {
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file = l.findExt(dom, "mo")
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if file != "" {
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poObj = new(Mo)
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// Parse file.
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poObj.ParseFile(file)
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} else {
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// fallback return if no file found with
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return
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}
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}
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// Save new domain
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l.Lock()
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if l.Domains == nil {
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l.Domains = make(map[string]Translator)
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}
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if l.defaultDomain == "" {
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l.defaultDomain = dom
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}
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l.Domains[dom] = poObj
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// Unlock "Save new domain"
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l.Unlock()
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}
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// AddTranslator takes a domain name and a Translator object to make it available in the Locale object.
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func (l *Locale) AddTranslator(dom string, tr Translator) {
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l.Lock()
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if l.Domains == nil {
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l.Domains = make(map[string]Translator)
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}
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if l.defaultDomain == "" {
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l.defaultDomain = dom
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}
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l.Domains[dom] = tr
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l.Unlock()
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}
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// GetDomain is the domain getter for the package configuration
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func (l *Locale) GetDomain() string {
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l.RLock()
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dom := l.defaultDomain
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l.RUnlock()
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return dom
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}
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// SetDomain sets the name for the domain to be used.
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func (l *Locale) SetDomain(dom string) {
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l.Lock()
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l.defaultDomain = dom
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l.Unlock()
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}
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// Get uses a domain "default" to return the corresponding Translation of a given string.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) Get(str string, vars ...interface{}) string {
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return l.GetD(l.GetDomain(), str, vars...)
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}
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// GetN retrieves the (N)th plural form of Translation for the given string in the "default" domain.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetN(str, plural string, n int, vars ...interface{}) string {
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return l.GetND(l.GetDomain(), str, plural, n, vars...)
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}
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// GetD returns the corresponding Translation in the given domain for the given string.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetD(dom, str string, vars ...interface{}) string {
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return l.GetND(dom, str, str, 1, vars...)
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}
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// GetND retrieves the (N)th plural form of Translation in the given domain for the given string.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetND(dom, str, plural string, n int, vars ...interface{}) string {
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// Sync read
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l.RLock()
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defer l.RUnlock()
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if l.Domains != nil {
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if _, ok := l.Domains[dom]; ok {
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if l.Domains[dom] != nil {
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return l.Domains[dom].GetN(str, plural, n, vars...)
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}
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}
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}
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// Return the same we received by default
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return Printf(plural, vars...)
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}
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// GetC uses a domain "default" to return the corresponding Translation of the given string in the given context.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetC(str, ctx string, vars ...interface{}) string {
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return l.GetDC(l.GetDomain(), str, ctx, vars...)
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}
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// GetNC retrieves the (N)th plural form of Translation for the given string in the given context in the "default" domain.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetNC(str, plural string, n int, ctx string, vars ...interface{}) string {
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return l.GetNDC(l.GetDomain(), str, plural, n, ctx, vars...)
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}
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// GetDC returns the corresponding Translation in the given domain for the given string in the given context.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetDC(dom, str, ctx string, vars ...interface{}) string {
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return l.GetNDC(dom, str, str, 1, ctx, vars...)
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}
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// GetNDC retrieves the (N)th plural form of Translation in the given domain for the given string in the given context.
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// Supports optional parameters (vars... interface{}) to be inserted on the formatted string using the fmt.Printf syntax.
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func (l *Locale) GetNDC(dom, str, plural string, n int, ctx string, vars ...interface{}) string {
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// Sync read
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l.RLock()
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defer l.RUnlock()
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if l.Domains != nil {
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if _, ok := l.Domains[dom]; ok {
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if l.Domains[dom] != nil {
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return l.Domains[dom].GetNC(str, plural, n, ctx, vars...)
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}
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}
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}
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// Return the same we received by default
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return Printf(plural, vars...)
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}
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// LocaleEncoding is used as intermediary storage to encode Locale objects to Gob.
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type LocaleEncoding struct {
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Path string
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Lang string
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Domains map[string][]byte
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DefaultDomain string
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}
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// MarshalBinary implements encoding BinaryMarshaler interface
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func (l *Locale) MarshalBinary() ([]byte, error) {
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obj := new(LocaleEncoding)
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obj.DefaultDomain = l.defaultDomain
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obj.Domains = make(map[string][]byte)
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for k, v := range l.Domains {
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var err error
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obj.Domains[k], err = v.MarshalBinary()
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if err != nil {
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return nil, err
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}
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}
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obj.Lang = l.lang
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obj.Path = l.path
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var buff bytes.Buffer
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encoder := gob.NewEncoder(&buff)
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err := encoder.Encode(obj)
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return buff.Bytes(), err
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}
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// UnmarshalBinary implements encoding BinaryUnmarshaler interface
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func (l *Locale) UnmarshalBinary(data []byte) error {
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buff := bytes.NewBuffer(data)
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obj := new(LocaleEncoding)
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decoder := gob.NewDecoder(buff)
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err := decoder.Decode(obj)
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if err != nil {
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return err
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}
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l.defaultDomain = obj.DefaultDomain
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l.lang = obj.Lang
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l.path = obj.Path
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// Decode Domains
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l.Domains = make(map[string]Translator)
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for k, v := range obj.Domains {
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var tr TranslatorEncoding
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buff := bytes.NewBuffer(v)
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trDecoder := gob.NewDecoder(buff)
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err := trDecoder.Decode(&tr)
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if err != nil {
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return err
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}
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l.Domains[k] = tr.GetTranslator()
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}
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return nil
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}
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