build(common): extract i18n locale data from cldr (#18284)
PR Close #18284
This commit is contained in:
Olivier Combe
committed by
Miško Hevery
Miško Hevery
parent
409688fe17
commit
33d250ffaa
@ -1,179 +0,0 @@
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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const cldr = require('cldr');
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// locale list
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const locales = cldr.localeIds;
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const langToRule = {};
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const ruleToLang = {};
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const variants = [];
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const localeToVariant = {};
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const DEFAULT_RULE = `function anonymous(n\n/**/) {\nreturn"other"\n}`;
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const EMPTY_RULE = `function anonymous(n\n/**/) {\n\n}`;
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locales.forEach(locale => {
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const rule = normalizeRule(cldr.extractPluralRuleFunction(locale).toString());
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const lang = getVariantLang(locale, rule);
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if (!lang || !rule) {
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return;
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}
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if (!ruleToLang[rule]) {
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ruleToLang[rule] = [];
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} else if (ruleToLang[rule].indexOf(lang) > -1) {
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return;
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}
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ruleToLang[rule].push(lang);
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});
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let nextVariantCode = 'a'.charCodeAt(0);
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variants.forEach(locale => {
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const rule = normalizeRule(cldr.extractPluralRuleFunction(locale).toString());
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if (!rule) {
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return;
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}
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let mapTo = null;
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if (ruleToLang[rule]) {
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mapTo = ruleToLang[rule][0];
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localeToVariant[locale] = mapTo;
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return;
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}
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if (!mapTo) {
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mapTo = '_' + String.fromCharCode(nextVariantCode++);
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langToRule[mapTo] = rule;
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ruleToLang[rule] = [mapTo];
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localeToVariant[locale] = mapTo;
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}
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});
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console.log(generateCode());
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function generateCode() {
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checkMapping();
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return `
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// This is generated code DO NOT MODIFY
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// see angular/script/cldr/gen_plural_rules.js
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/** @experimental */
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export enum Plural {
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Zero,
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One,
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Two,
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Few,
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Many,
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Other,
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}
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` + generateVars() +
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generateRules() + `
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}`;
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}
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function generateRules() {
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const codeParts = [`
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const lang = locale.split('-')[0].toLowerCase();
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switch (lang) {`];
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Object.keys(ruleToLang).forEach(rule => {
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const langs = ruleToLang[rule];
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codeParts.push(...langs.map(l => ` case '${l}': `));
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codeParts.push(` ${rule}`);
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});
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codeParts.push(` // When there is no specification, the default is always other
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// see http://cldr.unicode.org/index/cldr-spec/plural-rules
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// "other (required—general plural form — also used if the language only has a single form)"
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default:
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return Plural.Other;
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}`);
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return codeParts.join('\n');
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}
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function generateVars(){
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return `
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/**
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* Returns the plural case based on the locale
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*
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* @experimental
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*/
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export function getPluralCase(locale: string, nLike: number | string): Plural {
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// TODO(vicb): lazy compute
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if (typeof nLike === 'string') {
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nLike = parseInt(<string>nLike, 10);
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}
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const n: number = nLike as number;
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const nDecimal = n.toString().replace(/^[^.]*\\.?/, '');
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const i = Math.floor(Math.abs(n));
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const v = nDecimal.length;
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const f = parseInt(nDecimal, 10);
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const t = parseInt(n.toString().replace(/^[^.]*\\.?|0+$/g,''), 10) || 0;
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`;
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}
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function checkMapping() {
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if (localeToVariant.length) {
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console.log(`Mapping required:`);
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console.log(localeToVariant);
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throw new Error('not implemented');
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}
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}
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/**
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* If the language rule do not match an existing language rule, flag it as variant and handle it at the end
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*/
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function getVariantLang(locale, rule) {
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let lang = locale.split('_')[0];
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if (!langToRule[lang]) {
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langToRule[lang] = rule;
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return lang;
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}
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if (langToRule[lang] === rule) {
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return lang;
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}
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variants.push(locale);
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return null;
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}
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function normalizeRule(fn) {
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if (fn === DEFAULT_RULE || fn === EMPTY_RULE) return;
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return fn
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.replace(toRegExp('function anonymous(n\n/**/) {\n'), '')
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.replace(toRegExp('var'), 'let')
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.replace(toRegExp('"zero"'), ' Plural.Zero')
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.replace(toRegExp('"one"'), ' Plural.One')
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.replace(toRegExp('"two"'), ' Plural.Two')
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.replace(toRegExp('"few"'), ' Plural.Few')
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.replace(toRegExp('"many"'), ' Plural.Many')
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.replace(toRegExp('"other"'), ' Plural.Other')
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.replace(toRegExp('\n}'), '')
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.replace(toRegExp('let'), '')
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.replace(toRegExp('if(typeof n==="string")n=parseInt(n,10);'), '')
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.replace(toRegExp('i=Math.floor(Math.abs(n))'), '')
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.replace(/v=n.toString.*?.length/g, '')
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.replace(/f=parseInt.*?\|\|0/g, '')
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.replace(/t=parseInt.*?\|\|0/g, '')
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.replace(/^[ ,;]*/, '')
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+ ';';
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}
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function toRegExp(s) {
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return new RegExp(s.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1'), 'g');
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}
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