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87 lines
3.7 KiB
87 lines
3.7 KiB
var hasOwnProperty = Object.prototype.hasOwnProperty; |
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var walk = require('css-tree').walk; |
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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 cleanRuleset(node, item, list, options) { |
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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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} |
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if (node.prelude.children.isEmpty() || |
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node.block.children.isEmpty()) { |
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list.remove(item); |
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} |
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};
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