mirror of
https://github.com/angular/angular.git
synced 2026-09-14 13:54:52 +08:00
Joey Perrott
47 lines
1.9 KiB
TypeScript
47 lines
1.9 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC 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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import {runfiles} from '@bazel/runfiles';
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import {CldrLocaleData} from './cldr-data';
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// There are no types available for `cldr`.
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const {load: createCldr} = await import('cldr' as any);
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// Load once to avoid re-parsing CLDR XML data on every invocation.
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const cldr = createCldr(runfiles.resolve('cldr_xml_data'));
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/**
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* Returns the plural function for a locale.
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*/
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export function getPluralFunction(localeData: CldrLocaleData, withTypes = true) {
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// We use the resolved bundle for extracting the plural function. This matches with the
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// lookup logic used by other extractions in the tool (using `cldrjs`), and also ensures
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// we follow the CLDR-specified bundle lookup algorithm. A language does not necessarily
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// resolve directly to a bundle CLDR provides data for.
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const bundleName = localeData.attributes.bundle;
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let fn = cldr.extractPluralRuleFunction(bundleName).toString();
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const numberType = withTypes ? ': number' : '';
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fn = fn
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.replace(/function anonymous\(val[^)]+\)/g, `function plural(val${numberType})${numberType}`)
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// Since our generated plural functions only take numbers, we can eliminate some of
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// the logic generated by the `cldr` package (to reduce payload size).
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.replace(/n\s+=\s+Number\(val\)/, 'n = val')
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.replace(/if\s+\(isNaN\(n\)\)\s+throw Error\([^)]+\);/, '');
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// The replacement values must match the `Plural` enum from common.
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// We do not use the enum directly to avoid depending on that package.
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return fn
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.replace(/["']zero["']/, '0')
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.replace(/["']one["']/, '1')
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.replace(/["']two["']/, '2')
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.replace(/["']few["']/, '3')
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.replace(/["']many["']/, '4')
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.replace(/["']other["']/, '5');
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}
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