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node_modules/csso/lib/restructure/prepare/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(',');
+};