angular-docs-cn/tools/gulp-tasks/cldr/closure.js

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
const fs = require('fs');
const path = require('path');
const yargs = require('yargs').argv;
const {I18N_FOLDER, I18N_DATA_FOLDER, RELATIVE_I18N_DATA_FOLDER, HEADER} = require('./extract');
const OUTPUT_NAME = `closure-locale.ts`;
module.exports = (gulp, done) => {
let GOOG_LOCALES;
if (yargs.locales) {
GOOG_LOCALES = yargs.locales.split(',');
} else {
if (!fs.existsSync(path.join(__dirname, 'cldr-data'))) {
throw new Error(`You must run "gulp cldr:download" before you can extract the data`);
}
const cldrData = require('./cldr-data');
GOOG_LOCALES = cldrData.availableLocales;
}
console.log(`Writing file ${I18N_DATA_FOLDER}/${OUTPUT_NAME}`);
fs.writeFileSync(
`${RELATIVE_I18N_DATA_FOLDER}/${OUTPUT_NAME}`, generateAllLocalesFile(GOOG_LOCALES));
console.log(`Formatting ${I18N_DATA_FOLDER}/${OUTPUT_NAME}..."`);
const format = require('gulp-clang-format');
const clangFormat = require('clang-format');
return gulp.src([`${I18N_DATA_FOLDER}/${OUTPUT_NAME}`], {base: '.'})
.pipe(format.format('file', clangFormat))
.pipe(gulp.dest('.'));
};
/**
* Generate a file that contains all locale to import for closure.
* Tree shaking will only keep the data for the `goog.LOCALE` locale.
*/
function generateAllLocalesFile(LOCALES) {
function generateCases(locale) {
let str = '';
if (locale.match(/-/)) {
str = `case '${locale.replace('-', '_')}':\n`
}
// clang-format off
str += `case '${locale}':
l = ${toCamelCase(locale)};
break;
`;
// clang-format on
return str;
}
// clang-format off
return `${HEADER}
import {registerLocaleData} from '../src/i18n/locale_data';
${LOCALES.map(locale => `import ${toCamelCase(locale)} from './${locale}';\n`).join('')}
let l: any;
switch (goog.LOCALE) {
${LOCALES.map(locale => generateCases(locale)).join('')}
default:
l = en;
}
registerLocaleData(l);
`;
// clang-format on
}
/**
* Transform a string to camelCase
*/
function toCamelCase(str) {
return str.replace(/-+([a-z0-9A-Z])/g, (...m) => m[1].toUpperCase());
}
module.exports.I18N_FOLDER = I18N_FOLDER;
module.exports.I18N_DATA_FOLDER = I18N_DATA_FOLDER;