63 lines
1.7 KiB
Ruby
63 lines
1.7 KiB
Ruby
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module Vool
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class IfStatement < Statement
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attr_reader :condition , :if_true , :if_false
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def initialize( cond , if_true , if_false = nil)
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@condition = cond
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@if_true = if_true
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@if_false = if_false
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end
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def to_mom( compiler )
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if_false ? full_if(compiler) : simple_if(compiler)
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end
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def simple_if(compiler)
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true_label = Mom::Label.new( self,"true_label_#{object_id.to_s(16)}")
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merge_label = Mom::Label.new( self,"merge_label_#{object_id.to_s(16)}")
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head = Mom::TruthCheck.new(condition.slot_definition(compiler) , merge_label)
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head << true_label
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head << if_true.to_mom(compiler)
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head << merge_label
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end
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def full_if(compiler)
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true_label = Mom::Label.new( self , "true_label_#{object_id.to_s(16)}")
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false_label = Mom::Label.new( self , "false_label_#{object_id.to_s(16)}")
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merge_label = Mom::Label.new( self , "merge_label_#{object_id.to_s(16)}")
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head = Mom::TruthCheck.new(condition.slot_definition(compiler) , false_label)
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head << true_label
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head << if_true.to_mom(compiler)
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head << Mom::Jump.new(merge_label)
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head << false_label
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head << if_false.to_mom(compiler)
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head << merge_label
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end
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def each(&block)
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block.call(condition)
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@if_true.each(&block)
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@if_false.each(&block) if @if_false
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end
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def has_false?
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@if_false != nil
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end
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def has_true?
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@if_true != nil
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end
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def to_s(depth = 0)
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parts = ["if (#{@condition})" , @body.to_s(depth + 1) ]
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parts += ["else" , "@if_false.to_s(depth + 1)"] if(@false)
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parts << "end"
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at_depth(depth , *parts )
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end
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end
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end
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