module.exports = function specificity(simpleSelector) {
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var A = 0;
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var B = 0;
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var C = 0;
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simpleSelector.children.each(function walk(node) {
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switch (node.type) {
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case 'SelectorList':
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case 'Selector':
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node.children.each(walk);
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break;
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case 'IdSelector':
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A++;
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break;
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case 'ClassSelector':
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case 'AttributeSelector':
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B++;
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break;
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case 'PseudoClassSelector':
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switch (node.name.toLowerCase()) {
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case 'not':
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node.children.each(walk);
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break;
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case 'before':
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case 'after':
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case 'first-line':
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case 'first-letter':
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C++;
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break;
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// TODO: support for :nth-*(.. of <SelectorList>), :matches(), :has()
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default:
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B++;
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}
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break;
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case 'PseudoElementSelector':
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C++;
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break;
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case 'TypeSelector':
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// ignore universal selector
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if (node.name.charAt(node.name.length - 1) !== '*') {
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C++;
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}
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break;
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}
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});
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return [A, B, C];
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};
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