104 lines
4 KiB
JavaScript
104 lines
4 KiB
JavaScript
'use strict';
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const cssTree = require('css-tree');
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const utils = require('./utils.cjs');
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const { hasOwnProperty } = Object.prototype;
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const skipUsageFilteringAtrule = new Set(['keyframes']);
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function cleanUnused(selectorList, usageData) {
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selectorList.children.forEach((selector, item, list) => {
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let shouldRemove = false;
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cssTree.walk(selector, function(node) {
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// ignore nodes in nested selectors
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if (this.selector === null || this.selector === selectorList) {
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switch (node.type) {
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case 'SelectorList':
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// TODO: remove toLowerCase when pseudo selectors will be normalized
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// ignore selectors inside :not()
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if (this.function === null || this.function.name.toLowerCase() !== 'not') {
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if (cleanUnused(node, usageData)) {
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shouldRemove = true;
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}
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}
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break;
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case 'ClassSelector':
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if (usageData.whitelist !== null &&
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usageData.whitelist.classes !== null &&
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!hasOwnProperty.call(usageData.whitelist.classes, node.name)) {
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shouldRemove = true;
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}
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if (usageData.blacklist !== null &&
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usageData.blacklist.classes !== null &&
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hasOwnProperty.call(usageData.blacklist.classes, node.name)) {
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shouldRemove = true;
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}
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break;
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case 'IdSelector':
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if (usageData.whitelist !== null &&
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usageData.whitelist.ids !== null &&
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!hasOwnProperty.call(usageData.whitelist.ids, node.name)) {
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shouldRemove = true;
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}
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if (usageData.blacklist !== null &&
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usageData.blacklist.ids !== null &&
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hasOwnProperty.call(usageData.blacklist.ids, node.name)) {
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shouldRemove = true;
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}
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break;
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case 'TypeSelector':
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// TODO: remove toLowerCase when type selectors will be normalized
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// ignore universal selectors
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if (node.name.charAt(node.name.length - 1) !== '*') {
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if (usageData.whitelist !== null &&
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usageData.whitelist.tags !== null &&
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!hasOwnProperty.call(usageData.whitelist.tags, node.name.toLowerCase())) {
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shouldRemove = true;
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}
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if (usageData.blacklist !== null &&
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usageData.blacklist.tags !== null &&
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hasOwnProperty.call(usageData.blacklist.tags, node.name.toLowerCase())) {
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shouldRemove = true;
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}
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}
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break;
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}
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}
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});
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if (shouldRemove) {
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list.remove(item);
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}
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});
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return selectorList.children.isEmpty;
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}
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function cleanRule(node, item, list, options) {
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if (utils.hasNoChildren(node.prelude) || utils.hasNoChildren(node.block)) {
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list.remove(item);
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return;
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}
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// avoid usage filtering for some at-rules
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if (this.atrule && skipUsageFilteringAtrule.has(cssTree.keyword(this.atrule.name).basename)) {
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return;
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}
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const { usage } = options;
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if (usage && (usage.whitelist !== null || usage.blacklist !== null)) {
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cleanUnused(node.prelude, usage);
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if (utils.hasNoChildren(node.prelude)) {
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list.remove(item);
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return;
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}
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}
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}
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module.exports = cleanRule;
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