From: Nicholas Wieland <nicholas_wieland@...>
Date: 2005-06-01T01:42:59+09:00
Subject: [RFC] DocTest module

Hi all,
this is the first time I write code in Ruby that's not Rails-centric, so
I'd like to have feedback and comments on this real newbish attempt to
port Python doctest module to Ruby (http://rubyurl.com/tE0er).
I'm still in the process of learning Ruby - I mean, I've understood the
concepts but lack the experience to call myself a Ruby programmer - so
I'm glad to receive every suggestion or critique to increase my
knowledge of the language.

SCRIPT_LINES__ = {}

module DocTest

  class DocTestCase

    attr_reader :doctest

    def initialize( mod )
      @doctest = {}
      self.fetch( mod )
    end

    def run
      @doctest.keys.each do |code|
        if eval( code ).to_s == @doctest[ code ].to_s
          return "OK"
        else
          return "NO"
        end
      end
    end

    def fetch( mod )
      body, result = '', ''
      require "#{ mod }"
      SCRIPT_LINES__.each_value do |source|
        source.each do |line|
          line = line.strip
          case line
          when /^# *>>/
            body << line.gsub( /^# *>>/, '' ).strip << '; '
          when /^# *=>/
            result << line.gsub( /^# *=>/, '' ).strip
            @doctest[ body ] = result
            body, result = '', ''
          end
        end
      end
    end

end

Is it a good choice to use eval for this kind of task ?
I wasn't able to find any documentation on IRB, but my first idea was to
use the real IRB for doctest comparing an emulated IRB session (a
doctest) with a real IRB session, and I still think it's the best way,
but reading all IRB source is far out of my possibilities :)

A very simple testcase:

$:.unshift( File.join( File.dirname( __FILE__ ), '../lib' ) )

require 'test/unit'
require 'doctest'

class TestDocTestCase < Test::Unit::TestCase

  def test_simple
    # >> 1 + 2
    # => 3

    dt = DocTest::DocTestCase.new( __FILE__ )
    assert_equal( "OK", dt.run )
  end

  def test_complex
    # >> a = 1
    # >> b = 12.3
    # >> c = a + b
    # >> c
    # => 13.3

    dt = DocTest::DocTestCase.new( __FILE__ )
    assert_equal( "OK", dt.run )
  end

end

Sorry for the long post.

TIA,
  ngw

-- 
checking for life_signs in -lKenny... no
	Oh my god, make (1) killed Kenny ! You, bastards !

nicholas_wieland-at-yahoo-dot-it

	

	
		
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