1 files changed, 62 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..b824ceb5
--- /dev/null
+++ b/node_modules/clean-css/lib/utils/split.js
@@ -0,0 +1,62 @@
+var Marker = require('../tokenizer/marker');
+
+function is(value, separator, isSeparatorRegex) {
+  return isSeparatorRegex
+    ? separator.test(value)
+    : value === separator;
+}
+
+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 = [];
+  var isSeparatorRegex = typeof (separator) == 'object' && 'exec' in separator;
+
+  if (!isSeparatorRegex && 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 && is(value[cursor], separator, isSeparatorRegex)) {
+      parts.push(value.substring(lastStart, cursor));
+
+      if (isSeparatorRegex && separator.exec(value[cursor]).length > 1) {
+        parts.push(value[cursor]);
+      }
+
+      lastStart = cursor + 1;
+    }
+
+    cursor++;
+  }
+
+  if (lastStart < cursor + 1) {
+    lastValue = value.substring(lastStart);
+    lastCharacter = lastValue[lastValue.length - 1];
+    if (is(lastCharacter, separator, isSeparatorRegex)) {
+      lastValue = lastValue.substring(0, lastValue.length - 1);
+    }
+
+    parts.push(lastValue);
+  }
+
+  return parts;
+}
+
+module.exports = split;