68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
/* exported styleSectionsEqual styleCodeEmpty */
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'use strict';
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function styleCodeEmpty(code) {
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const rx = /\s+|\/\*[\s\S]*?\*\/|@namespace[^;]+;|@charset[^;]+;/giy;
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while (rx.exec(code)) {
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if (rx.lastIndex === code.length) {
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return true;
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}
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}
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return false;
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}
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/**
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* @param {Style} a - first style object
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* @param {Style} b - second style object
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* @param {Object} options
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* @param {Boolean=} options.ignoreCode -
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* true used by invalidateCache to determine if cached filters should be cleared
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* @param {Boolean=} options.checkSource -
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* true used by update check to compare the server response
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* instead of sections that depend on @preprocessor
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* @returns {Boolean|undefined}
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*/
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function styleSectionsEqual(a, b, {ignoreCode, checkSource} = {}) {
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if (checkSource &&
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typeof a.sourceCode === 'string' &&
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typeof b.sourceCode === 'string') {
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return a.sourceCode === b.sourceCode;
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}
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a = a.sections;
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b = b.sections;
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if (!a || !b) {
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return undefined;
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}
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if (a.length !== b.length) {
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return false;
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}
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// order of sections should be identical to account for the case of multiple
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// sections matching the same URL because the order of rules is part of cascading
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return a.every((sectionA, index) => propertiesEqual(sectionA, b[index]));
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function propertiesEqual(secA, secB) {
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for (const name of ['urlPrefixes', 'urls', 'domains', 'regexps']) {
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if (!equalOrEmpty(secA[name], secB[name], 'every', arrayMirrors)) {
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return false;
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}
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}
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return ignoreCode || equalOrEmpty(secA.code, secB.code, 'substr', (a, b) => a === b);
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}
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function equalOrEmpty(a, b, telltale, comparator) {
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const typeA = a && typeof a[telltale] === 'function';
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const typeB = b && typeof b[telltale] === 'function';
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return (
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(a === null || a === undefined || (typeA && !a.length)) &&
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(b === null || b === undefined || (typeB && !b.length))
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) || typeA && typeB && a.length === b.length && comparator(a, b);
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}
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function arrayMirrors(array1, array2) {
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return (
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array1.every(el => array2.includes(el)) &&
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array2.every(el => array1.includes(el))
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);
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}
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}
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