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1 files changed, 48 insertions, 0 deletions

diff --git a/node_modules/csso/lib/compressor/restructure/prepare/specificity.js b/node_modules/csso/lib/compressor/restructure/prepare/specificity.js
new file mode 100644
index 00000000..506c3373
--- /dev/null
+++ b/node_modules/csso/lib/compressor/restructure/prepare/specificity.js
@@ -0,0 +1,48 @@
+module.exports = function specificity(simpleSelector) {
+    var A = 0;
+    var B = 0;
+    var C = 0;
+
+    simpleSelector.sequence.each(function walk(data) {
+        switch (data.type) {
+            case 'SimpleSelector':
+            case 'Negation':
+                data.sequence.each(walk);
+                break;
+
+            case 'Id':
+                A++;
+                break;
+
+            case 'Class':
+            case 'Attribute':
+            case 'FunctionalPseudo':
+                B++;
+                break;
+
+            case 'Identifier':
+                if (data.name !== '*') {
+                    C++;
+                }
+                break;
+
+            case 'PseudoElement':
+                C++;
+                break;
+
+            case 'PseudoClass':
+                var name = data.name.toLowerCase();
+                if (name === 'before' ||
+                    name === 'after' ||
+                    name === 'first-line' ||
+                    name === 'first-letter') {
+                    C++;
+                } else {
+                    B++;
+                }
+                break;
+        }
+    });
+
+    return [A, B, C];
+};