36 lines
1.4 KiB
TypeScript
36 lines
1.4 KiB
TypeScript
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/**
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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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/**
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* To create smaller locale files, we remove duplicated data.
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* To make this work we store the data in arrays, where `undefined` indicates that the
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* value is a duplicate of the previous value in the array.
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* e.g. consider an array like: [x, y, undefined, z, undefined, undefined]
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* The first `undefined` is equivalent to y, the second and third are equivalent to z
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* Note that the first value in an array is always defined.
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*
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* Also since we need to know which data is assumed similar, it is important that we store those
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* similar data in arrays to mark the delimitation between values that have different meanings
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* (e.g. months and days).
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*
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* For further size improvements, "undefined" values will be replaced by a constant in the arrays
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* as the last step of the file generation (in generateLocale and generateLocaleExtra).
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* e.g.: [x, y, undefined, z, undefined, undefined] will be [x, y, u, z, u, u]
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*/
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export function removeDuplicates(data: unknown[]) {
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const dedup = [data[0]];
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for (let i = 1; i < data.length; i++) {
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if (JSON.stringify(data[i]) !== JSON.stringify(data[i - 1])) {
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dedup.push(data[i]);
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} else {
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dedup.push(undefined);
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}
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}
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return dedup;
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}
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