@awayfl/avm2/lib/nat/defineClassLoader.ts

Virtual machine for executing AS3 code

import { AXApplicationDomain } from '../run/AXApplicationDomain';
import { Multiname } from '../abc/lazy/Multiname';
import { runtimeWriter } from '../run/writers';
import { release } from '@awayfl/swf-loader';
import { assert } from '@awayjs/graphics';

/**
 * Creates a self patching getter that lazily constructs the class and memoizes
 * to the class's instance constructor.
 */
export function defineClassLoader(
	applicationDomain: AXApplicationDomain,
	container: Object,
	mn: Multiname,
	classAlias: string
) {
	Object.defineProperty(container, classAlias, {
		get: function() {
			runtimeWriter && runtimeWriter.writeLn('Running Memoizer: ' + mn.name);
			const axClass = applicationDomain.getClass(mn);
			release || assert(axClass, 'Class ' + mn + ' is not found.');
			release || assert(axClass.axConstruct);
			const loader: any = function() {
				return axClass.axConstruct(<any>arguments);
			};
			loader.axIsType = function(value: any) {
				return axClass.axIsType(value);
			};
			loader.axClass = axClass;
			Object.defineProperty(container, classAlias, {
				value: loader,
				writable: false
			});
			return loader;
		},
		configurable: true
	});
}