@rr0/lang/dist/Translator.js

Language and translation

import { Gender, ObjectUtils } from "@rr0/common";
export class Translator {
    /**
     * Creates a message translator to some language.
     *
     * @param locale The language to translate to.
     * @param grammar The grammar rules of the language.
     */
    constructor(locale, grammar) {
        this.locale = locale;
        this.grammar = grammar;
    }
    compoundKey(subKeys) {
        return subKeys.sort().join('_');
    }
    getGender(word) {
        return Gender[Object.keys(word)[0]];
    }
    translateKey(obj, key, values = {}) {
        if (!obj.hasOwnProperty(key)) {
            throw Error(`No key "${key}" found in ${JSON.stringify(obj)}`);
        }
        return this.translate(obj[key], values);
    }
    /**
     * Returns a translated message, with possible values interpolated.
     *
     * @param template The message template, which can contain placeholders such as ${key} or ${key:plural}
     * @param values The values to be interpolated into the placeholders.
     */
    translate(template, values = {}) {
        //   assert.ok(Boolean(template), 'Translation requires a template')
        let translated = template;
        for (const key in values) {
            if (values.hasOwnProperty(key)) {
                const value = values[key];
                if (ObjectUtils.isSet(value)) {
                    translated = translated.replace(`\$\{${`${key}:plural`}\}`, this.grammar.plural(value));
                    translated = translated.replace(`\$\{${key}\}`, value);
                }
            }
        }
        if (translated.indexOf('${') > 0) {
            throw Error(`Parameter was not replaced in "${translated}"`);
        }
        return translated;
    }
}
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