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1 files changed, 99 insertions, 0 deletions

diff --git a/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js b/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js
new file mode 100644
index 00000000..56c46b56
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/processSelector.js
@@ -0,0 +1,99 @@
+var translate = require('../../../utils/translate.js');
+var specificity = require('./specificity.js');
+
+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.selector.selectors.each(function(simpleSelector) {
+        var tagName = '*';
+        var scope = 0;
+
+        simpleSelector.sequence.some(function(node) {
+            switch (node.type) {
+                case 'Class':
+                    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: ' + translate(simpleSelector));
+                        }
+
+                        scope = classScope;
+                    }
+                    break;
+
+                case 'PseudoClass':
+                    if (!nonFreezePseudoClasses.hasOwnProperty(node.name)) {
+                        pseudos[node.name] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'PseudoElement':
+                    if (!nonFreezePseudoElements.hasOwnProperty(node.name)) {
+                        pseudos[node.name] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'FunctionalPseudo':
+                    pseudos[node.name] = true;
+                    hasPseudo = true;
+                    break;
+
+                case 'Negation':
+                    pseudos.not = true;
+                    hasPseudo = true;
+                    break;
+
+                case 'Identifier':
+                    tagName = node.name;
+                    break;
+
+                case 'Attribute':
+                    if (node.flags) {
+                        pseudos['[' + node.flags + ']'] = true;
+                        hasPseudo = true;
+                    }
+                    break;
+
+                case 'Combinator':
+                    tagName = '*';
+                    break;
+            }
+        });
+
+        simpleSelector.id = translate(simpleSelector);
+        simpleSelector.compareMarker = specificity(simpleSelector).toString();
+
+        if (scope) {
+            simpleSelector.compareMarker += ':' + scope;
+        }
+
+        if (tagName !== '*') {
+            simpleSelector.compareMarker += ',' + tagName;
+        }
+    });
+
+    if (hasPseudo) {
+        node.pseudoSignature = Object.keys(pseudos).sort().join(',');
+    }
+};