class AliasProcessorTests < Test::Unit::TestCase
  def assert_alias expected, original
    if RUBY_VERSION =~ /^1\.9/
      original_sexp = Ruby19Parser.new.parse original
      expected_sexp = Ruby19Parser.new.parse expected
    else
      original_sexp = RubyParser.new.parse original
      expected_sexp = RubyParser.new.parse expected
    end

    processed_sexp = Brakeman::AliasProcessor.new.process_safely original_sexp
    result = processed_sexp.last

    assert_equal expected_sexp, result
  end

  def test_addition
    assert_alias '10', <<-RUBY
      x = 1 + 2 + 3
      x += 4
      x
    RUBY
  end

  def test_simple_math
    assert_alias '42', <<-RUBY
      x = 8 * 5
      y = 32 / 8
      y -= 2
      x += y
      x
    RUBY
  end

  def test_concatentation
    assert_alias "'Hello world!'", <<-RUBY
      x = "Hello"
      y = x + " "
      z = y + "world!"
      z
    RUBY
  end

  def test_string_append
    assert_alias "'hello world'", <<-RUBY
      x = ""
      x << "hello" << " " << "world"
      x
    RUBY
  end

  def test_array_index
    assert_alias "'cookie'", <<-RUBY
      dessert = ["fruit", "pie", "ice cream"]
      dessert << "cookie"
      dessert[1] = "cake"
      dessert[1]
      index = 2
      index = index + 1
      dessert[index]
    RUBY
  end

  def test_array_negative_index
    assert_alias "'ice cream'", <<-RUBY
      dessert = ["fruit", "pie", "ice cream"]
      dessert << "cookie"
      dessert[1] = "cake"
      dessert[1]
      index = -3
      index = 1 + index
      dessert[index]
    RUBY
  end


  def test_array_append
    assert_alias '[1, 2, 3]', <<-RUBY
      x = [1]
      x << 2 << 3
      x
    RUBY
  end

  def test_hash_index
    assert_alias "'You say goodbye, I say :hello'", <<-RUBY
      x = {:goodbye => "goodbye cruel world" }
      x[:hello] = "hello world"
      x.merge! :goodbye => "You say goodbye, I say :hello"
      x[:goodbye]
    RUBY
  end

  def test_obvious_if
    assert_alias "'Yes!'", <<-RUBY
      condition = true

      if condition
        x = "Yes!"
      else
        x = "No!"
      end

      x
    RUBY
  end

  def test_if
    assert_alias "'Awesome!' or 'Else awesome!'", <<-RUBY
      if something
        x = "Awesome!"
      elsif something_else
        x = "Else awesome!"
      end

      x
    RUBY
  end

  def test_or_equal
    assert_alias '10', <<-RUBY
      x.y = 10
      x.y ||= "not this!"
      x.y
    RUBY
  end

  def test_unknown_hash
    assert_alias '1', <<-RUBY
      some_hash[:x] = 1
      some_hash[:x]
    RUBY
  end

  def test_global
    assert_alias '1', <<-RUBY
      $x = 1
      $x
    RUBY
  end

  def test_class_var
    assert_alias '1', <<-RUBY
      @@x = 1
      @@x
    RUBY
  end

  def test_constant
    assert_alias '1', <<-RUBY
      X = 1
      X
    RUBY
  end

  def test_addition_chained
    assert_alias 'y + 5', <<-RUBY
    x = y + 2 + 3
    x
    RUBY
  end
end