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我有一些代码可以从简单的定义中将方法添加到模块中，以便通过 REST 客户端周围的包装类与远程资源进行对话。

def service_function(function_name, method, uri, parameters)
  class_eval <<-RUBY
    def #{function_name}(params)
      if !(#{function_name}_required_params - params.keys).empty? || \
           !(params.keys - #{function_name}_params).empty?
        raise Errors::InvalidParameters.new(service_name, __method__,
                                            params.keys, #{function_name}_params)
      end
      WebServices::ServiceRequest.perform(self.domain, #{uri}, #{method}, params)
    end

    def #{function_name}_params
      #{function_name}_required_params + #{function_name}_optional_params
    end

    def #{function_name}_required_params
      #{parameters}.select { |param,req| req }.keys
    end

    def #{function_name}_optional_params
      #{parameters}.select { |param,req| !req }.keys
    end
  RUBY
end

在我什至可以运行代码之前，只需要我在 IRB 中构建的 gem 就会吐出​​这个错误：

1.9.2p320 :001 > require 'web-services'
SyntaxError: (eval):7: unknown regexp options - rt

违规行是：

WebServices::ServiceRequest.perform(self.domain, #{uri}, #{method}, params)

删除“#{uri}”参数可以修复它，甚至保留“#{method}”参数。有没有人知道为什么会这样？我快束手无策了。

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1 回答 1

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You have a url that looks something like /something/rt and that will look like a regex literal in here:

WebServices::ServiceRequest.perform(self.domain, #{uri}, #{method}, params)

You need to escape and quote #{uri} so that it looks like a string inside the heredoc, that way class_eval will see perform(..., '/something/rt', ...) and be happy. You might have similar issues with #{method}.

于 2012-07-23T06:01:01.257 回答