gistfile1.js

  /*
  * Method will accept a Map, and populate a template 
  * Each child element (blocks and variables) will be processed as well
  * as any <included> directives
  * In case processing takes some significant time, we leverage a Future
  */
  Future<String> render(Map data){
    var completer = new Completer();
    String result = content;
    List futuresPending = new List();
    try{
     data.forEach((String key, Dynamic value){
      if(value is List){
        String blockRenderResult = blocks[key].render(value);
        result = result.replaceAll(blocks[key].sourceField, blockRenderResult);
      }else if(includes.containsKey(key)){
        TemplateFactory tf = new TemplateFactory();
        Future<Template> futureTemplate = tf.compile('views/$key.template');
        futuresPending.add(futureTemplate);
            futureTemplate.handleException(onException(exception){
                print('error occurred while processing include!');
              });
            futureTemplate.chain((Template templateFromCompile) => templateFromCompile.render(value))
            .transform(transformation(String returnedStringFromRender){
              result = result.replaceAll('{{>${includes[key].filename}}}', returnedStringFromRender.trim());
            });
      }else{
        result = result.replaceAll('{{${tags[key].name}}}', value);
      }
     });
    }catch(Exception e){
      completer.completeException(e);
    }
    Futures.wait(futuresPending).then(onComplete(List futureResults){
      completer.complete(result);
    });
    
    return completer.future;
  }