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rOACCT/node_modules/csso/lib/restructure/prepare/processSelector.js
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processSelector.js
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			var generate = require('css-tree').generate;
			var specificity = require('./specificity');

			var nonFreezePseudoElements = {
			'first-letter': true,
			'first-line': true,
			'after': true,
			'before': true
			};
			var nonFreezePseudoClasses = {
			'link': true,
			'visited': true,
			'hover': true,
			'active': true,
			'first-letter': true,
			'first-line': true,
			'after': true,
			'before': true
			};

			module.exports = function freeze(node, usageData) {
			var pseudos = Object.create(null);
			var hasPseudo = false;

			node.prelude.children.each(function(simpleSelector) {
			var tagName = '*';
			var scope = 0;

			simpleSelector.children.each(function(node) {
			switch (node.type) {
			case 'ClassSelector':
			if (usageData && usageData.scopes) {
			var classScope = usageData.scopes[node.name] \|\| 0;

			if (scope !== 0 && classScope !== scope) {
			throw new Error('Selector can\'t has classes from different scopes: ' + generate(simpleSelector));
			}

			scope = classScope;
			}
			break;

			case 'PseudoClassSelector':
			var name = node.name.toLowerCase();

			if (!nonFreezePseudoClasses.hasOwnProperty(name)) {
			pseudos[':' + name] = true;
			hasPseudo = true;
			}
			break;

			case 'PseudoElementSelector':
			var name = node.name.toLowerCase();

			if (!nonFreezePseudoElements.hasOwnProperty(name)) {
			pseudos['::' + name] = true;
			hasPseudo = true;
			}
			break;

			case 'TypeSelector':
			tagName = node.name.toLowerCase();
			break;

			case 'AttributeSelector':
			if (node.flags) {
			pseudos['[' + node.flags.toLowerCase() + ']'] = true;
			hasPseudo = true;
			}
			break;

			case 'WhiteSpace':
			case 'Combinator':
			tagName = '*';
			break;
			}
			});

			simpleSelector.compareMarker = specificity(simpleSelector).toString();
			simpleSelector.id = null; // pre-init property to avoid multiple hidden class
			simpleSelector.id = generate(simpleSelector);

			if (scope) {
			simpleSelector.compareMarker += ':' + scope;
			}

			if (tagName !== '*') {
			simpleSelector.compareMarker += ',' + tagName;
			}
			});

			// add property to all rule nodes to avoid multiple hidden class
			node.pseudoSignature = hasPseudo && Object.keys(pseudos).sort().join(',');
			};