以编程方式获取Ruby关键字

发布时间：2020-12-17 03:32:31 所属栏目：百科来源：网络整理

导读：我在 Ruby中有一个Array,包含所有关键字. 例如： RUBY_KEYWORDS = %w( alias and BEGIN begin break case class def defined do else elsif END end ensure false for if in module next nil not or redo rescue retry return self super then true undef un

我在 Ruby中有一个Array,包含所有关键字.

例如：

RUBY_KEYWORDS = %w(

  alias and BEGIN begin break case class def defined 
  do else elsif END end ensure false for if in module 
  next nil not or redo rescue retry return self super 
  then true undef unless until when while yield

)

我的问题很简单：

是否有以编程方式访问所有关键字的内置方式？

我的一些项目需要针对用户输入运行查询,
并且必须在中定义相同的数组有点烦人
所有这些项目.

解决方法

试试这个代码:)

RubyToken::TokenDefinitions.select { |definition| definition[1] == RubyToken::TkId }
                           .map { |definition| definition[2] }
                           .compact
                           .sort

# returns :
# ["BEGIN","END","__FILE__","__LINE__","alias","and","begin","break","case","class","def","defined?","do","else","elsif","end","ensure","false","for","if","in","module","next","nil","not","or","redo","rescue","retry","return","self","super","then","true","undef","unless","until","when","while","yield"]

（编辑：李大同）

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