From: Robert Klemme <shortcutter@...>
Date: 2006-11-06T18:35:07+09:00
Subject: Re: Ugly code - suggestions?

On 05.11.2006 22:13, Gabriele Marrone wrote:
> Hello!
> 
> I'm writing an ANSI color codes parser which gets a string with text and 
> ANSI color codes and outputs an array with substrings and numbers of the 
> color codes.
> A color code is something like "\e[31m". Generally, I assume (am I 
> wrong?) they match /\e\[(\d+)(;\d+)*m/.
> 
> Here is what I came up with:
> 
> 
> module ANSIParser
>   def self.ansi_to_array(str)
>     str = str.to_s
>     ret = []
>     while ((m = /\e\[(\d+)(;\d+)*m/.match(str)))
>       ret << m.pre_match if m.pre_match != ""
>       ret += m[0].scan(/\d+/).map { |c| c.to_i }
>       str = m.post_match
>     end
>     ret << str if str != ""
>     return ret
>   end
> end
> 
> # TEST:
> ansistr = "\e[31mred,\e[32;1m\e[32;1mbold green\e[33;32;31mred anyway, 
> still bold\e[33;32;31m"
> 
> puts ansistr # you should see colors if your terminal supports ANSI escapes
> puts ANSIParser::ansi_to_array(ansistr).inspect

 >> ansistr = "\e[31mred,\e[32;1m\e[32;1mbold green\e[33;32;31mred 
anyway, still bold\e[33;32;31m"
=> "\e[31mred,\e[32;1m\e[32;1mbold green\e[33;32;31mred anyway, still 
bold\e[33;32;31m"

 >> ansistr.split(%r{(\e\[\d+(?:;\d+)*m)}).inject([]) do |arr, s|
?>   case s
 >>     when ""
 >>       arr
 >>     when %r{^\e}
 >>       arr.concat( s.scan( /\d+/ ).map {|x| x.to_i} )
 >>     else
?>       arr << s
 >>   end
 >> end
=> [31, "red,", 32, 1, 32, 1, "bold green", 33, 32, 31, "red anyway, 
still bold", 33, 32, 31]

Kind regards

	robert