File: test_lookahead.rb

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require "#{File.dirname(__FILE__)}/helpers.rb"

class TestLookAhead < TC
  def test_lookahead
    p1 = 'a'.r & 'b'
    p2 = /\w/.r
    p = seq(p1, p2)
    ase ['a', 'b'], p.parse('ab')
    ase INVALID, p.parse('ac')
    
    p1 = 'a'.r ^ 'b'
    p = seq(p1, p2)
    ase ['a', 'c'], p.parse('ac')
    ase INVALID, p.parse('ab')
  end

  def test_negative_lookahead
    p = 'a'.r ^ 'b'
    ase 'a', p.parse('ac')
    ase INVALID, p.parse('ab')
  end
end