94 lines
3.8 KiB
JavaScript
94 lines
3.8 KiB
JavaScript
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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var walk = require('css-tree').walk;
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var { hasNoChildren } = require('./utils');
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function cleanUnused(selectorList, usageData) {
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selectorList.children.each(function(selector, item, list) {
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var shouldRemove = false;
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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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module.exports = function cleanRule(node, item, list, options) {
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if (hasNoChildren(node.prelude) || hasNoChildren(node.block)) {
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list.remove(item);
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return;
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}
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var usageData = options.usage;
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if (usageData && (usageData.whitelist !== null || usageData.blacklist !== null)) {
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cleanUnused(node.prelude, usageData);
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if (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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