Issue 5079, 5516 - Use webpack for browser tests, modules for content scripts

lib/common.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 30 matching lines @@
     // process anchor at expression start
     .replace(/^\\\|/, "^")
     // process anchor at expression end
     .replace(/\\\|$/, "$")
     // remove leading wildcards
     .replace(/^(\.\*)/, "")
     // remove trailing wildcards
     .replace(/(\.\*)$/, "");
 }
 
-if (typeof exports != "undefined")
-  exports.filterToRegExp = filterToRegExp;
+exports.filterToRegExp = filterToRegExp;
+
+function splitSelector(selector)
+{
+  if (selector.indexOf(",") == -1)
+    return [selector];
+
+  let selectors = [];
+  let start = 0;
+  let level = 0;
+  let sep = "";
+
+  for (let i = 0; i < selector.length; i++)
+  {
+    let chr = selector[i];
+
+    if (chr == "\\")        // ignore escaped characters
+      i++;
+    else if (chr == sep)    // don't split within quoted text
+      sep = "";             // e.g. [attr=","]
+    else if (sep == "")
+    {
+      if (chr == '"' || chr == "'")
+        sep = chr;
+      else if (chr == "(")  // don't split between parentheses
+        level++;            // e.g. :matches(div,span)
+      else if (chr == ")")
+        level = Math.max(0, level - 1);
+      else if (chr == "," && level == 0)
+      {
+        selectors.push(selector.substring(start, i));
+        start = i + 1;
+      }
+    }
+  }
+
+  selectors.push(selector.substring(start));
+  return selectors;
+}
+
+exports.splitSelector = splitSelector;