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

lib/common.js

Index: lib/common.js
diff --git a/lib/common.js b/lib/common.js
index 54118e54d82caa582ce9b16d0d467eef21987388..9bf00db7d5f89e8bfd516a1259055087148e33db 100644
--- a/lib/common.js
+++ b/lib/common.js
@@ -48,5 +48,44 @@ function filterToRegExp(text)
     .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;