From: Bil Kleb <Bil.Kleb@...>
Date: 2006-04-17T20:50:37+09:00
Subject: argument parsing with embedded parentheses

Hello,

Can someone please point me at a simple recipe for
parsing a parameter list with embedded parentheses
and commas, e.g.,

  class String
    def get_args
      split(',').map{|e| e.strip} # naive recipe
    end
  end

  require 'test/unit'

  class TestArgumentParser < Test::Unit::TestCase
    def test_simple_cases
      assert_equal %w[ a b ],         'a,b'.get_args
      assert_equal %w[ a_frog b25 ],  'a_frog, b25'.get_args
    end
    def test_embedded_parens
      assert_equal %w[ a(1) b ],      'a(1), b'.get_args
      assert_equal %w[ a b(i) ],      'a, b(i)'.get_args
    end
    def test_embedded_parens_with_commas
      assert_equal %w[ a(0,j) b ],    'a(0,j),b'.get_args
      assert_equal %w[ a() b(j,k) ],  'a(),b(j,k)'.get_args
      assert_equal %w[ c(i,j,t(1)) ], 'c(i,j,t(1))'.get_args
    end
  end

Thanks,
--
Bil
http://fun3d.larc.nasa.gov