133 lines
3.8 KiB
JavaScript
133 lines
3.8 KiB
JavaScript
/**
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* Translation Manager
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* Handles the JavaScript side of translating strings
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* in a way which fits with Laravel.
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*/
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class Translator {
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/**
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* Create an instance, Passing in the required translations
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* @param translations
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*/
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constructor(translations) {
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this.store = new Map();
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this.parseTranslations();
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}
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/**
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* Parse translations out of the page and place into the store.
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*/
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parseTranslations() {
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const translationMetaTags = document.querySelectorAll('meta[name="translation"]');
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for (let tag of translationMetaTags) {
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const key = tag.getAttribute('key');
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const value = tag.getAttribute('value');
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this.store.set(key, value);
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}
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}
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/**
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* Get a translation, Same format as laravel's 'trans' helper
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* @param key
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* @param replacements
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* @returns {*}
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*/
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get(key, replacements) {
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const text = this.getTransText(key);
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return this.performReplacements(text, replacements);
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}
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/**
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* Get pluralised text, Dependant on the given count.
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* Same format at laravel's 'trans_choice' helper.
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* @param key
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* @param count
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* @param replacements
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* @returns {*}
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*/
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getPlural(key, count, replacements) {
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const text = this.getTransText(key);
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return this.parsePlural(text, count, replacements);
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}
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/**
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* Parse the given translation and find the correct plural option
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* to use. Similar format at laravel's 'trans_choice' helper.
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* @param {String} translation
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* @param {Number} count
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* @param {Object} replacements
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* @returns {String}
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*/
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parsePlural(translation, count, replacements) {
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const splitText = translation.split('|');
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const exactCountRegex = /^{([0-9]+)}/;
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const rangeRegex = /^\[([0-9]+),([0-9*]+)]/;
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let result = null;
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for (let t of splitText) {
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// Parse exact matches
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const exactMatches = t.match(exactCountRegex);
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if (exactMatches !== null && Number(exactMatches[1]) === count) {
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result = t.replace(exactCountRegex, '').trim();
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break;
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}
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// Parse range matches
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const rangeMatches = t.match(rangeRegex);
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if (rangeMatches !== null) {
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const rangeStart = Number(rangeMatches[1]);
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if (rangeStart <= count && (rangeMatches[2] === '*' || Number(rangeMatches[2]) >= count)) {
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result = t.replace(rangeRegex, '').trim();
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break;
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}
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}
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}
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if (result === null && splitText.length > 1) {
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result = (count === 1) ? splitText[0] : splitText[1];
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}
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if (result === null) {
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result = splitText[0];
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}
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return this.performReplacements(result, replacements);
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}
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/**
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* Fetched translation text from the store for the given key.
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* @param key
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* @returns {String|Object}
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*/
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getTransText(key) {
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const value = this.store.get(key);
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if (value === undefined) {
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console.warn(`Translation with key "${key}" does not exist`);
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}
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return value;
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}
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/**
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* Perform replacements on a string.
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* @param {String} string
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* @param {Object} replacements
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* @returns {*}
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*/
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performReplacements(string, replacements) {
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if (!replacements) return string;
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const replaceMatches = string.match(/:([\S]+)/g);
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if (replaceMatches === null) return string;
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replaceMatches.forEach(match => {
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const key = match.substring(1);
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if (typeof replacements[key] === 'undefined') return;
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string = string.replace(match, replacements[key]);
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});
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return string;
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}
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}
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export default Translator;
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