From: sto.mar@...
Date: 2013-02-05T22:58:55+09:00
Subject: Re: old syntax? what's going on here

Am 05.02.2013 14:33, schrieb tamouse mailing lists:
> I have this in a _spec.rb file: (a gem I inherited at work)
>
> Open3.expects(:popen3).with do |command|
>        case part_of_command
>        when Regexp: command =~ part_of_command
>        when String: command.include?(part_of_command)
>        else raise "Can't match that"
>        end
>      end
>
> which ruby is complaining about:
>
> spec/ruby_gpg_spec.rb:7: syntax error, unexpected ':', expecting
> keyword_then or ',' or ';' or '\n'
>        when Regexp: command =~ part_of_command
>                    ^
> spec/ruby_gpg_spec.rb:8: syntax error, unexpected keyword_when,
> expecting keyword_end
>        when String: command.include?(part_of_command)
>            ^
> spec/ruby_gpg_spec.rb:9: syntax error, unexpected keyword_else,
> expecting keyword_end
>        else raise "Can't match that"
>            ^
> spec/ruby_gpg_spec.rb:241: syntax error, unexpected keyword_end, expecting $end
>
> I'm completely unfamiliar with what is supposed to be happening above,
> but I rather assume that Regexp: and String: have something to do with
> the Open3.expects bit.

No. This case statement (with corrected syntax of course)
uses the class of the object referenced by the `command`
variable to branch execution.

command = 'list'
case command
when String
   puts 'a String'
when Regexp
   puts 'a Regexp'
else
   puts 'neither String nor Regexp'
end

=> a String


-- 
<https://github.com/stomar/>