dart2js: Handle zero-terminated content explicitly.

tests/compiler/dart2js/zero_termination_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// A regression test for issue 22667.
+//
+// Makes sure that we don't print a '\0' character for files that are not
+// properly new-line terminated.
+library zero_termination_test;
+
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+import 'package:async_helper/async_helper.dart';
+import 'package:expect/expect.dart';
+import 'package:path/path.dart' as path;
+
+Uri pathOfData = Platform.script;
+Directory tempDir;
+String outFilePath;
+
+_sendNotFound(HttpResponse response) {
+  response.statusCode = HttpStatus.NOT_FOUND;
+  response.close();
+}
+
+Future handleRequest(HttpRequest request) {
+  final String path = request.uri.path.substring(1);
+  final Uri requestPath = pathOfData.resolve(path);
+  final File file = new File(requestPath.toFilePath());
+  return file.exists().then((bool found) {
+    if (found) {
+      file.openRead()
+          .pipe(request.response)
+          .catchError((e) { _sendNotFound(request.response); });
+    } else {
+      _sendNotFound(request.response);
+    }
+  });
+}
+
+void cleanup() {
+  File outFile = new File(outFilePath);
+  if (outFile.existsSync()) {
+    outFile.deleteSync();
+  }
+}
+
+Future launchDart2Js(args) {
+  String ext = Platform.isWindows ? '.bat' : '';
+  String command =
+      path.normalize(path.join(path.fromUri(Platform.script),
+                    '../../../../sdk/bin/dart2js${ext}'));
+  return Process.run(command, args, stdoutEncoding: null);
+}
+
+void check(ProcessResult result) {
+  Expect.notEquals(0, result.exitCode);
+  List<int> stdout = result.stdout;
+  String stdoutString = UTF8.decode(stdout);
+  Expect.isTrue(stdoutString.contains("Error"));
+  // Make sure the "499" from the last line is in the output.
+  Expect.isTrue(stdoutString.contains("499"));
+
+  // Make sure that the output does not contain any 0 character.
+  Expect.isFalse(stdout.contains(0));
+}
+
+Future testFile() async {
+  String inFilePath = pathOfData.resolve('one_line_dart_program.dart').path;
+  List<String> args = [inFilePath, "--out=" + outFilePath];
+
+  await cleanup();
+  check(await launchDart2Js(args));
+  await cleanup();
+}
+
+Future serverRunning(HttpServer server) async {
+  int port = server.port;
+  String inFilePath = "http://127.0.0.1:$port/one_line_dart_program.dart";
+  List<String> args = [inFilePath, "--out=" + outFilePath];
+
+  server.listen(handleRequest);
+  try {
+    await cleanup();
+    check(await launchDart2Js(args));
+  } finally {
+    await server.close();
+    await cleanup();
+  }
+}
+
+Future testHttp() {
+  return HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, 0)
+      .then((HttpServer server) => serverRunning(server));
+}
+
+runTests() async {
+  tempDir = Directory.systemTemp.createTempSync('directory_test');
+  outFilePath = path.join(tempDir.path, "out.js");
+
+  try {
+    await testFile();
+    await testHttp();
+  } finally {
+    await tempDir.delete(recursive:true);
+  }
+}
+
+main() {
+  asyncStart();
+  runTests().whenComplete(asyncEnd);
+}