Ruby PrettyPrint单引号

Question

how to make Ruby pp function outputing String in valid (parsable) Ruby string using single quote if possible?

rows = [{name:'test',id:'182572'},{name:"Kal'el",id:'125125'}]
require 'pp'
pp rows

output was:

[{:name=>"test", :id=>"182572"}, {:name=>"Kal'el", :id=>"125125"}]

desired output was:

[{:name=>'test', :id=>'182572'}, {:name=>"Kal'el", :id=>'125125'}]

(is it possible to use quote single quote inside single quote string?)

nevermind, i found the answer since my edit on sawa's answer has been rejected, i'll put it here:

class String
  alias :old_inspect :inspect
  def inspect
    return old_inspect if self.include? "'"
    "'#{self}'"
  end
end

Answer 1

You can't. Strings, after parsing, aren't double or single quoted, they're just strings. If you want strings to appear with single quotes, you'll have to write your own printing function.

Answer 2

Redefine String#inspect .

class String
  def inspect; "'#{self}'" end
end