import "dart:isolate";

import "dart:async";

Uri toDartDataUri(String source) {

return Uri.parse("data:application/dart;charset=utf-8,"

"${Uri.encodeComponent(source)}");

}

createIsolateSource(String moduleSource, List<List<String>> moduleImports) {

var moduleSourceParts = [];

moduleImports.forEach((sourceImport) {

String modName = sourceImport[0];

String modAlias = sourceImport[1];

moduleSourceParts.add("import 'package:${modName}.dart' as ${modAlias};");

});

moduleSourceParts.add(moduleSource);

return """

""";

}

var timeStamp = new DateTime.now().millisecondsSinceEpoch;

dynamic callModule(dynamic data) { return data.map( (a) => a+1); }

evalModule(String moduleSource, List<List<String>> moduleImports, List args) {

String source = createIsolateSource(moduleSource, moduleImports);

Completer completer = new Completer();

RawReceivePort receivePort;

receivePort = new RawReceivePort( (message) {

receivePort.close();

completer.complete(message);

});

// Note: we have a special karma plugin that sends files under

// urls like /package_1234 as permanently cached.

// With this, spawning multiple isolates gets faster as Darts does not

// reload the files from the server.

var packageRoot = Uri.parse('/packages_${timeStamp}');

return Isolate.spawnUri(toDartDataUri(source), args, receivePort.sendPort, packageRoot: packageRoot).then( (isolate) {

RawReceivePort errorPort;

errorPort = new RawReceivePort( (message) {

completer.completeError(message);

});

isolate.addErrorListener(errorPort.sendPort);

return completer.future;

});

}