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1 files changed, 50 insertions, 0 deletions

diff --git a/node_modules/clean-css/lib/utils/split.js b/node_modules/clean-css/lib/utils/split.js
new file mode 100644
index 00000000..c9162550
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/split.js
@@ -0,0 +1,50 @@
+var Marker = require('../tokenizer/marker');
+
+function split(value, separator) {
+  var openLevel = Marker.OPEN_ROUND_BRACKET;
+  var closeLevel = Marker.CLOSE_ROUND_BRACKET;
+  var level = 0;
+  var cursor = 0;
+  var lastStart = 0;
+  var lastValue;
+  var lastCharacter;
+  var len = value.length;
+  var parts = [];
+
+  if (value.indexOf(separator) == -1) {
+    return [value];
+  }
+
+  if (value.indexOf(openLevel) == -1) {
+    return value.split(separator);
+  }
+
+  while (cursor < len) {
+    if (value[cursor] == openLevel) {
+      level++;
+    } else if (value[cursor] == closeLevel) {
+      level--;
+    }
+
+    if (level === 0 && cursor > 0 && cursor + 1 < len && value[cursor] == separator) {
+      parts.push(value.substring(lastStart, cursor));
+      lastStart = cursor + 1;
+    }
+
+    cursor++;
+  }
+
+  if (lastStart < cursor + 1) {
+    lastValue = value.substring(lastStart);
+    lastCharacter = lastValue[lastValue.length - 1];
+    if (lastCharacter == separator) {
+      lastValue = lastValue.substring(0, lastValue.length - 1);
+    }
+
+    parts.push(lastValue);
+  }
+
+  return parts;
+}
+
+module.exports = split;