Ruby 块到字符串而不是执行 [英] Ruby block to string instead of executing

问题描述

以这个例子为例:

write_as_string { puts 'x' }

然后我希望能够做到

def write_as_string(&block)
  puts block.to_s
end

执行此操作时，我希望输出为:

When I execute this, I want the output to be:

"puts 'x'"

我希望能够接收该块并获取该块的实际代码而不是执行它.

I want to be able to receive the block and get the actual code for the block instead of executing it.

动机:创建 DSL，我希望将模拟转换为许多其他方法调用，从调用代码中隐藏 - 使用现有对象和方法而不用猴子修补它们.

Motivation: Creating a DSL, I want to the mock to be converted into a number of other method calls, hidden from the calling code - using existing objects and methods without monkey patching them.

对此的任何想法都会很棒！

Any ideas on this would be great!

谢谢

本

推荐答案

如果您使用的是 Ruby 1.9，则可以使用 Sourcify gem.它提供了 Proc#to_source，类似于 ParseTree 的 Proc#to_ruby.

If you're on Ruby 1.9, you can use the sourcify gem. It provides Proc#to_source, which is like ParseTree's Proc#to_ruby.

在使用 sourcify 时，如果您在源代码中嵌套了 procs，则可能需要使用 :attached_to 选项来帮助它:

When using sourcify, if you have nested procs in your source code, you might have to help it along with the :attached_to option:

## (Works in Ruby 1.8) Using ParseTree (with parse_tree_extensions)
block.to_ruby
## (Works in Ruby 1.9) Using sourcify
block.to_source
## Try this if you get Sourcify::NoMatchingProcError or Sourcify::MultipleMatchingProcsPerLineError
block.to_source :attached_to => :name_of_block_in_source_code

我发布了关于 ParseTree 和 Ruby 1.9 在我的公司的博客.

I posted about ParseTree and Ruby 1.9 in my company's blog.

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