[experiment] Issue 7045 - Optimize V8 memory layout of filter text

test/filterText.js

Index: test/filterText.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/test/filterText.js
@@ -0,0 +1,106 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+const {createSandbox} = require("./_common");
+
+let LONG_DOMAINS_THRESHOLD = null;
+let optimizeContentFilterText = null;
+let optimizeRegExpFilterText = null;
+
+function randomName()
+{
+  let str = Math.random().toString(36).substring(2);
+  return str.substring(0, Math.ceil(Math.random() * str.length));
+}
+
+function randomDomain()
+{
+  // Create a domain with between one and four parts to cover all the usual
+  // cases.
+  let domain = randomName();
+  for (let i = 0; i < Math.floor(Math.random() * 4); i++)
+    domain += "." + randomName();
+  return domain;
+}
+
+exports.setUp = function(callback)
+{
+  let sandboxedRequire = createSandbox({
+    extraExports: {
+      filterText: ["LONG_DOMAINS_THRESHOLD"]
+    }
+  });
+  (
+    {LONG_DOMAINS_THRESHOLD,
+     optimizeContentFilterText,
+     optimizeRegExpFilterText} = sandboxedRequire("../lib/filterText")
+  );
+
+  callback();
+};
+
+exports.testOptimizeContentFilterText = function(test)
+{
+  let domains = randomDomain();
+  while (domains.length < LONG_DOMAINS_THRESHOLD)
+    domains += "," + randomDomain();
+
+  let filterParts = [
+    [domains, null, "." + randomName()],
+    [domains, "@", "." + randomName()],
+    [domains, "?", `.${randomName()}:-abp-contains(${randomName()})`],
+    [domains, "$",
+     `${randomName()} '${randomName()} ${randomName()}'  ${randomName()}`]
+  ];
+
+  let filters = filterParts.map(
+    ([domains_, type, selector]) =>
+      [domains_ + "#" + (type || "") + "#" + selector,
+       domains_, type, selector]
+  );
+
+  // We just have to make sure that the parts returned are the same as the
+  // parts passed in to the function.
+  for (let filter of filters)
+    test.deepEqual(optimizeContentFilterText(...filter), filter);
+
+  test.done();
+};
+
+exports.testOptimizeRegExpFilterText = function(test)
+{
+  let domains = randomDomain();
+  while (domains.length < LONG_DOMAINS_THRESHOLD)
+    domains += "|" + randomDomain();
+
+  let filterParts = [
+    ["", randomName(), domains],
+    ["@@", randomName(), domains]
+  ];
+
+  let filters = filterParts.map(
+    ([marker, pattern, domains_]) => [marker + pattern + "$domain=" + domains,
+                                      pattern, domains, null, null, null]
+  );
+
+  for (let filter of filters)
+    test.deepEqual(optimizeRegExpFilterText(...filter), filter);
+
+  test.done();
+};