Issue 4125 - [emscripten] Convert filter classes to C++

lib/filterClassesNew.js

 "use strict";
 
-let {_Filter_FromText, _Filter_Normalize, _Filter_get_type} = require("./compiled");
-let {wrapCall, stringArg, stringResult} = require("./compiledTools");
-let constructors = Object.create(null);
-
-function filterResult(call)
+let compiled = require("compiled");
+for (let cls of ["Filter", "InvalidFilter", "CommentFilter", "ActiveFilter",
+    "RegExpFilter", "BlockingFilter", "WhitelistFilter", "ElemHideBase",
+    "ElemHideFilter", "ElemHideException", "CSSPropertyFilter"])
 {
-  return function()
-  {
-    let result = call.apply(this, arguments);
-    let type = _Filter_get_type(result);
-    if (type in constructors)
-      return new (constructors[type])(result);
-    else
-      throw new Error("Unexpected filter type " + type);
-  };
+  exports[cls] = compiled[cls];
 }
-
-function createFilterClass(superclass, type, typeId)
-{
-  let result = function(pointer)
-  {
-    this._pointer = pointer;
-  };
-  if (superclass)
-    result.prototype = Object.create(superclass);
-  if (type)
-    Object.defineProperty(result.prototype, "type", {get: () => type, enumerable: true});
-  if (typeId)
-    constructors[typeId] = result;
-  return result;
-}
-
-exports.Filter = createFilterClass();
-exports.Filter.fromText = wrapCall(filterResult(stringArg(0, _Filter_FromText)));
-exports.Filter.normalize = wrapCall(stringResult(stringArg(0, _Filter_Normalize)));
-
-exports.InvalidFilter = createFilterClass(exports.Filter, "invalid", 1);
-exports.CommentFilter = createFilterClass(exports.Filter, "comment", 2);
-exports.RegExpFilter = createFilterClass(exports.Filter, "blocking", 3);
-exports.WhiteListFilter = createFilterClass(exports.RegExpFilter, "whitelist", 4);
-exports.ElemHideBase = createFilterClass(exports.Filter);
-exports.ElemHideFilter = createFilterClass(exports.ElemHideBase, "elemhide", 5);
-exports.ElemHideException = createFilterClass(exports.ElemHideException, "elemhideexception", 6);
-exports.CSSPropertyFilter = createFilterClass(exports.ElemHideBase, "cssproperty", 7);