Future _compile()

in frontend_server_common/lib/src/frontend_server_client.dart [492:559]
61 lines of code
10 McCabe index (conditional complexity)

  Future<CompilerOutput> _compile(
      String scriptUri, String outputFilePath, String packagesFilePath) async {
    var frontendServer = frontendServerExecutable;
    var args = <String>[
      frontendServer,
      '--sdk-root',
      sdkRoot,
      '--incremental',
      '--target=dartdevc',
      '-Ddart.developer.causal_async_stacks=true',
      '--output-dill',
      outputFilePath,
      if (packagesFilePath != null) ...<String>[
        '--packages',
        packagesFilePath,
      ] else if (packagesPath != null) ...<String>[
        '--packages',
        packagesPath,
      ],
      if (fileSystemRoots != null)
        for (final String root in fileSystemRoots) ...<String>[
          '--filesystem-root',
          root,
        ],
      if (fileSystemScheme != null) ...<String>[
        '--filesystem-scheme',
        fileSystemScheme,
      ],
      if (platformDill != null) ...<String>[
        '--platform',
        platformDill,
      ],
      '--debugger-module-names',
      '--experimental-emit-debug-metadata',
      if (verbose) '--verbose'
    ];

    _logger.info(args.join(' '));
    _server = await Process.start(Platform.resolvedExecutable, args,
        workingDirectory: packagesPath);
    _server.stdout
        .transform<String>(utf8.decoder)
        .transform<String>(const LineSplitter())
        .listen(_stdoutHandler.handler, onDone: () {
      // when outputFilename future is not completed, but stdout is closed
      // process has died unexpectedly.
      if (!_stdoutHandler.compilerOutput.isCompleted) {
        _stdoutHandler.compilerOutput.complete(null);
        throw Exception('the Dart compiler exited unexpectedly.');
      }
    });

    _server.stderr
        .transform<String>(utf8.decoder)
        .transform<String>(const LineSplitter())
        .listen(_logger.info);

    unawaited(_server.exitCode.then((int code) {
      if (code != 0) {
        throw Exception('the Dart compiler exited unexpectedly.');
      }
    }));

    _server.stdin.writeln('compile $scriptUri');
    _logger.info('<- compile $scriptUri');

    return _stdoutHandler.compilerOutput.future;
  }