From: Albert Chou <achou@...>
Date: 2003-12-20T08:05:36+09:00
Subject: String.strip( string_to_strip )

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I've wanted a String.strip( string_to_strip ) method to augment the
existing strip() method for a long time, and today I TDD'ed myself one.
Anyone else have a use for such a thing?

Al



# cat StringTest.rb
require 'test/unit'
require 'stringadditions'

class StringTest < Test::Unit::TestCase
  def test_String_strip
    # Make sure original behavior of strip() is unchanged.
    s =3D '  string not surrounded by two spaces  '
    assert_equal( 'string not surrounded by two spaces', s.strip )
  end

  def test_String_strip_quotes
    s =3D '"string without quotes"'
    assert_equal( 'string without quotes', s.strip( '"' ) )
  end

  def test_String_strip_2quotes
    s =3D '""string without 2 quotes""'
    assert_equal( 'string without 2 quotes', s.strip( '"' ) )
  end
end


# cat stringadditions.rb
class String
  alias original_strip strip

  def strip( string_to_strip =3D nil )
    unless string_to_strip
      return original_strip
    else
      i =3D index( string_to_strip )
      while i do
        if i =3D=3D 0 then
          self[0..(string_to_strip.length - 1)] =3D ''
          i =3D index( string_to_strip )
        else
          break
        end
      end

      i =3D rindex( string_to_strip )
      while i do
        if self[i..-1] =3D=3D string_to_strip then
          self[i..-1] =3D ''
          i =3D rindex( string_to_strip )
        else
          break
        end
      end
    end

    return self
  end
end

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