Class: Skeem::SkmCondition

Inherits:
SkmMultiExpression show all
Defined in:
lib/skeem/s_expr_nodes.rb

Overview

class

Instance Attribute Summary collapse

Attributes inherited from SkmElement

#position

Instance Method Summary collapse

Methods inherited from SkmMultiExpression

#accept

Methods inherited from SkmElement

#accept, #boolean?, #bound!, #callable?, #char?, #complex?, #done!, #eqv?, #integer?, #list?, #null?, #number?, #pair?, #procedure?, #quoted!, #rational?, #real?, #skm_eq?, #skm_equal?, #string?, #symbol?, #unquoted!, #vector?, #verbatim?

Constructor Details

#initialize(aPosition, aTest, aConsequent, anAlternate) ⇒ SkmCondition

Returns a new instance of SkmCondition.



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# File 'lib/skeem/s_expr_nodes.rb', line 206

def initialize(aPosition, aTest, aConsequent, anAlternate)
  super(aPosition)
  @test = aTest
  @consequent = aConsequent
  @alternate = anAlternate
end

Instance Attribute Details

#alternate ⇒ Object (readonly)

Returns the value of attribute alternate.



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# File 'lib/skeem/s_expr_nodes.rb', line 204

def alternate
  @alternate
end

#consequent ⇒ Object (readonly)

Returns the value of attribute consequent.



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# File 'lib/skeem/s_expr_nodes.rb', line 203

def consequent
  @consequent
end

#test ⇒ Object (readonly)

Returns the value of attribute test.



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# File 'lib/skeem/s_expr_nodes.rb', line 202

def test
  @test
end

Instance Method Details

#associations ⇒ Object 



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# File 'lib/skeem/s_expr_nodes.rb', line 240

def associations
  %i[test consequent alternate]
end

#evaluate(aRuntime) ⇒ Object 



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# File 'lib/skeem/s_expr_nodes.rb', line 213

def evaluate(aRuntime)
  test_result = test.evaluate(aRuntime)
  condition_result = nil
  if test_result.boolean? && test_result.value == false
    # Only #f is considered as false, everything else is true
    condition_result = alternate ? alternate.evaluate(aRuntime) : SkmUndefined.instance
  else
    condition_result = consequent.evaluate(aRuntime)
  end
  condition_result
end

#inspect ⇒ Object 



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# File 'lib/skeem/s_expr_nodes.rb', line 233

def inspect
  result = "#{inspect_prefix}@test #{test.inspect}, "
  result << "@consequent #{consequent.inspect}, "
  result << "@alternate #{alternate.inspect}#{inspect_suffix}"
  result
end

#quasiquote(aRuntime) ⇒ Object 



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# File 'lib/skeem/s_expr_nodes.rb', line 225

def quasiquote(aRuntime)
  quasi_test = test.quasiquote(aRuntime)
  quasi_consequent = consequent.quasiquote(aRuntime)
  quasi_alternate = alternate.quasiquote(aRuntime)

  self.class.new(position, quasi_test, quasi_consequent, quasi_alternate)
end