void _initPlayground()

in lib/playground.dart [495:569]
54 lines of code
2 McCabe index (conditional complexity)

  void _initPlayground() {
    // Set up the iframe.
    executionService = ExecutionServiceIFrame(_frame);
    executionService.onStdout.listen(showOutput);
    executionService.onStderr.listen((m) => showOutput(m, error: true));

    // Set up Google Analytics.
    deps[Analytics] = Analytics();

    // Set up the gist loader.
    deps[GistLoader] = GistLoader.defaultFilters();

    // Set up CodeMirror
    editor = (editorFactory as CodeMirrorFactory)
        .createFromElement(_editorHost, options: codeMirrorOptions)
      ..theme = 'darkpad'
      ..mode = 'dart'
      ..showLineNumbers = true;

    initKeyBindings();

    context = PlaygroundContext(editor);
    deps[Context] = context;

    editorFactory.registerCompleter(
        'dart', DartCompleter(dartServices, context.dartDocument));

    context.onDartDirty.listen((_) => busyLight.on());
    context.onDartReconcile.listen((_) => performAnalysis());

    final Property htmlFile =
        GistFileProperty(_editableGist.getGistFile('index.html'));
    final Property htmlDoc =
        EditorDocumentProperty(context.htmlDocument, 'html');
    bind(htmlDoc, htmlFile);
    bind(htmlFile, htmlDoc);

    final Property cssFile =
        GistFileProperty(_editableGist.getGistFile('styles.css'));
    final Property cssDoc = EditorDocumentProperty(context.cssDocument, 'css');
    bind(cssDoc, cssFile);
    bind(cssFile, cssDoc);

    final Property dartFile =
        GistFileProperty(_editableGist.getGistFile('main.dart'));
    final Property dartDoc =
        EditorDocumentProperty(context.dartDocument, 'dart');
    bind(dartDoc, dartFile);
    bind(dartFile, dartDoc);

    // Listen for changes that would effect the documentation panel.
    editor.onMouseDown.listen((e) {
      // Delay to give codemirror time to process the mouse event.
      Timer.run(() {
        if (!context.cursorPositionIsWhitespace()) {
          _docHandler.generateDoc([_rightDocContentElement, _leftDocPanel]);
        }
      });
    });

    _docHandler = DocHandler(editor, context);

    updateVersions();

    analysisResultsController = AnalysisResultsController(
      DElement(querySelector('#issues')!),
      DElement(querySelector('#issues-message')!),
      DElement(querySelector('#issues-toggle')!),
      snackbar,
    )..onItemClicked.listen((item) {
        _jumpTo(item.line, item.charStart, item.charLength, focus: true);
      });

    _finishedInit();
  }