Issue 5201 - [emscripten] Replace EM_ASM calls by a custom JavaScript library

compiled/library.js

Index: compiled/library.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/library.js
@@ -0,0 +1,87 @@
+/*
+ * 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
+ * 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";
+
+mergeInto(LibraryManager.library, {
+  LogString: function(str)
+  {
+    console.log(readString(str));
+  },
+
+  LogInteger: function(i)
+  {
+    console.log(i);
+  },
+
+  LogPointer: function(ptr)
+  {
+    console.log(ptr);
+  },
+
+  LogError: function(str)
+  {
+    console.error(new Error(readString(str)).stack);
+  },
+
+  CharToLower: function(charCode)
+  {
+    return String.fromCharCode(charCode).toLowerCase().charCodeAt(0);
+  },
+
+  JSNotifyFilterChange: function(topic, filter)
+  {
+    FilterNotifier.triggerListeners(notifierTopics.get(topic),
+        exports.Filter.fromPointer(filter));
+  },
+
+  JSNotifySubscriptionChange: function(topic, subscription)
+  {
+    FilterNotifier.triggerListeners(notifierTopics.get(topic),
+        exports.Subscription.fromPointer(subscription));
+  },
+
+  $_regexp_data: Object.create(null),
+  $_regexp_counter: 0,
+
+  GenerateRegExp__deps: ["$_regexp_data", "$_regexp_counter"],
+  GenerateRegExp: function(source, matchCase)
+  {
+    var id = ++_regexp_counter;
+    try
+    {
+      _regexp_data[id] = new RegExp(readString(source), matchCase ? "" : "i");
+      return id;
+    }
+    catch (e)
+    {
+      return -1;
+    }
+  },
+
+  DeleteRegExp__deps: ["$_regexp_data"],
+  DeleteRegExp: function(id)
+  {
+    delete _regexp_data[id];
+  },
+
+  TestRegExp__deps: ["$_regexp_data"],
+  TestRegExp: function(id, str)
+  {
+    return _regexp_data[id].test(readString(str));
+  }
+});