code: function() {
      var block = this.emptyBlock(0);
  
      while ('eos' != this.peek().type) {
        if ('newline' == this.peek().type) {
          this.advance();
        } else if ('text-html' == this.peek().type) {
          block.nodes = block.nodes.concat(this.parseTextHtml());
        } else {
          var expr = this.parseExpr();
          if (expr)
            block.nodes.push(expr);
          }
        }
  
      return block;
    }
docs: Parse input returning a string of js for evaluation.
  
  @return {String}
  @api public