Class: Nydp::Cond_LEX

Inherits:
CondBase show all
Defined in:
lib/nydp/cond.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from CondBase

#initialize, #inspect, #to_s

Methods included from Helper

#cons, #list, #literal?, #pair?, #sig, #sym, #sym?

Methods included from Converter

#n2r, #r2n

Constructor Details

This class inherits a constructor from Nydp::CondBase

Class Method Details

.build(cond, when_true, when_false) ⇒ Object 



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# File 'lib/nydp/cond.rb', line 105

def self.build cond, when_true, when_false
  tsig       = sig(when_true)
  fsig       = sig(when_false)
  cond_sig = "#{tsig}_#{fsig}"

  # if (cond == when_true)
  #   OR_LEX.build cond, when_false

  if (cond == when_true) && (fsig == "LIT")
    OR_LEX_LIT.new cond, nil, when_false
  elsif (cond == when_true) && (fsig == "LEX")
    OR_LEX_LEX.new cond, nil, when_false
  else
    case cond_sig
    when "LIT_LIT"
      Nydp::Cond_LEX_LIT_LIT.new(cond, when_true.expression, when_false.expression)
    when "LEX_LIT"
      Nydp::Cond_LEX_LEX_LIT.new(cond, when_true, when_false.expression)
    when "CND_LIT"
      Nydp::Cond_LEX_CND_LIT.new(cond, when_true, when_false.expression)
    else
      Nydp::Cond_LEX.new(cond, cons(when_true), cons(when_false))
    end
  end
end

Instance Method Details

#execute(vm) ⇒ Object 



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# File 'lib/nydp/cond.rb', line 92

def execute vm
  truth = !Nydp::NIL.is?(@condition.value vm.current_context)
  vm.push_ctx_instructions (truth ? @when_true : @when_false)
end

#lexical_reach(n) ⇒ Object 



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# File 'lib/nydp/cond.rb', line 97

def lexical_reach n
  cr = @condition.lexical_reach(n)
  ct = @when_true.car.lexical_reach(n)
  cf = @when_false.car.lexical_reach(n)

  [cr, ct, cf].max
end