translate-default-compiler.ts
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///
/// Copyright © 2016-2020 The Thingsboard Authors
///
/// 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.
///
import {
MESSAGE_FORMAT_CONFIG,
MessageFormatConfig,
TranslateMessageFormatCompiler
} from 'ngx-translate-messageformat-compiler';
import { Inject, Injectable, Optional } from '@angular/core';
const parse = require('messageformat-parser').parse;
@Injectable({ providedIn: 'root' })
export class TranslateDefaultCompiler extends TranslateMessageFormatCompiler {
constructor(
@Optional()
@Inject(MESSAGE_FORMAT_CONFIG)
config?: MessageFormatConfig
) {
super(config);
}
public compile(value: string, lang: string): (params: any) => string {
return this.defaultCompile(value, lang);
}
public compileTranslations(translations: any, lang: string): any {
return this.defaultCompile(translations, lang);
}
private defaultCompile(src: any, lang: string): any {
if (typeof src !== 'object') {
if (this.checkIsPlural(src)) {
return super.compile(src, lang);
} else {
return src;
}
} else {
const result = {};
for (const key of Object.keys(src)) {
result[key] = this.defaultCompile(src[key], lang);
}
return result;
}
}
private checkIsPlural(src: string): boolean {
let tokens: any[];
try {
tokens = parse(src.replace(/\{\{/g, '{').replace(/\}\}/g, '}'),
{cardinal: [], ordinal: []});
} catch (e) {
console.warn(`Failed to parse source: ${src}`);
console.error(e);
}
const res = tokens.filter(
(value) => typeof value !== 'string' && value.type === 'plural'
);
return res.length > 0;
}
}