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var fs = require('fs')
var path = require('path')
var util = require('util')
function Y18N (opts) {
// configurable options.
opts = opts || {}
this.directory = opts.directory || './locales'
this.updateFiles = typeof opts.updateFiles === 'boolean' ? opts.updateFiles : true
this.locale = opts.locale || 'en'
this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true
// internal stuff.
this.cache = {}
this.writeQueue = []
}
Y18N.prototype.__ = function () {
var args = Array.prototype.slice.call(arguments)
var str = args.shift()
var cb = function () {} // start with noop.
if (typeof args[args.length - 1] === 'function') cb = args.pop()
cb = cb || function () {} // noop.
if (!this.cache[this.locale]) this._readLocaleFile()
// we've observed a new string, update the language file.
if (!this.cache[this.locale][str] && this.updateFiles) {
this.cache[this.locale][str] = str
// include the current directory and locale,
// since these values could change before the
// write is performed.
this._enqueueWrite([this.directory, this.locale, cb])
} else {
cb()
}
return util.format.apply(util, [this.cache[this.locale][str] || str].concat(args))
}
Y18N.prototype._enqueueWrite = function (work) {
this.writeQueue.push(work)
if (this.writeQueue.length === 1) this._processWriteQueue()
}
Y18N.prototype._processWriteQueue = function () {
var _this = this
var work = this.writeQueue[0]
// destructure the enqueued work.
var directory = work[0]
var locale = work[1]
var cb = work[2]
var languageFile = this._resolveLocaleFile(directory, locale)
var serializedLocale = JSON.stringify(this.cache[locale], null, 2)
fs.writeFile(languageFile, serializedLocale, 'utf-8', function (err) {
_this.writeQueue.shift()
if (_this.writeQueue.length > 0) _this._processWriteQueue()
cb(err)
})
}
Y18N.prototype._readLocaleFile = function () {
var localeLookup = {}
var languageFile = this._resolveLocaleFile(this.directory, this.locale)
try {
localeLookup = JSON.parse(fs.readFileSync(languageFile, 'utf-8'))
} catch (err) {
if (err instanceof SyntaxError) {
err.message = 'syntax error in ' + languageFile
}
if (err.code === 'ENOENT') localeLookup = {}
else throw err
}
this.cache[this.locale] = localeLookup
}
Y18N.prototype._resolveLocaleFile = function (directory, locale) {
var file = path.resolve(directory, './', locale + '.json')
if (this.fallbackToLanguage && !this._fileExistsSync(file) && ~locale.lastIndexOf('_')) {
// attempt fallback to language only
var languageFile = path.resolve(directory, './', locale.split('_')[0] + '.json')
if (this._fileExistsSync(languageFile)) file = languageFile
}
return file
}
// this only exists because fs.existsSync() "will be deprecated"
// see https://nodejs.org/api/fs.html#fs_fs_existssync_path
Y18N.prototype._fileExistsSync = function (file) {
try {
return fs.statSync(file).isFile()
} catch (err) {
return false
}
}
Y18N.prototype.__n = function () {
var args = Array.prototype.slice.call(arguments)
var singular = args.shift()
var plural = args.shift()
var quantity = args.shift()
var cb = function () {} // start with noop.
if (typeof args[args.length - 1] === 'function') cb = args.pop()
if (!this.cache[this.locale]) this._readLocaleFile()
var str = quantity === 1 ? singular : plural
if (this.cache[this.locale][singular]) {
str = this.cache[this.locale][singular][quantity === 1 ? 'one' : 'other']
}
// we've observed a new string, update the language file.
if (!this.cache[this.locale][singular] && this.updateFiles) {
this.cache[this.locale][singular] = {
one: singular,
other: plural
}
// include the current directory and locale,
// since these values could change before the
// write is performed.
this._enqueueWrite([this.directory, this.locale, cb])
} else {
cb()
}
// if a %d placeholder is provided, add quantity
// to the arguments expanded by util.format.
var values = [str]
if (~str.indexOf('%d')) values.push(quantity)
return util.format.apply(util, values.concat(args))
}
Y18N.prototype.setLocale = function (locale) {
this.locale = locale
}
Y18N.prototype.getLocale = function () {
return this.locale
}
Y18N.prototype.updateLocale = function (obj) {
if (!this.cache[this.locale]) this._readLocaleFile()
for (var key in obj) {
this.cache[this.locale][key] = obj[key]
}
}
module.exports = function (opts) {
var y18n = new Y18N(opts)
// bind all functions to y18n, so that
// they can be used in isolation.
for (var key in y18n) {
if (typeof y18n[key] === 'function') {
y18n[key] = y18n[key].bind(y18n)
}
}
return y18n
}
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