1 files changed, 32 insertions, 0 deletions
diff --git a/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js b/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js
new file mode 100644
index 00000000..811a517b
--- /dev/null
+++ b/node_modules/clean-css/lib/optimizer/level-2/rules-overlap.js
@@ -0,0 +1,32 @@
+var MODIFIER_PATTERN = /\-\-.+$/;
+
+function rulesOverlap(rule1, rule2, bemMode) {
+  var scope1;
+  var scope2;
+  var i, l;
+  var j, m;
+
+  for (i = 0, l = rule1.length; i < l; i++) {
+    scope1 = rule1[i][1];
+
+    for (j = 0, m = rule2.length; j < m; j++) {
+      scope2 = rule2[j][1];
+
+      if (scope1 == scope2) {
+        return true;
+      }
+
+      if (bemMode && withoutModifiers(scope1) == withoutModifiers(scope2)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+function withoutModifiers(scope) {
+  return scope.replace(MODIFIER_PATTERN, '');
+}
+
+module.exports = rulesOverlap;