36 lines
952 B
Ruby
36 lines
952 B
Ruby
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module Vool
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class WhileStatement < Statement
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attr_reader :condition , :body , :hoisted
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def initialize( condition , body , hoisted = nil)
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@hoisted = hoisted
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@condition = condition
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@body = body
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end
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def to_mom( compiler )
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merge_label = Mom::Label.new( "merge_label_#{object_id.to_s(16)}")
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cond_label = Mom::Label.new( "cond_label_#{object_id.to_s(16)}")
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codes = cond_label
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codes << @hoisted.to_mom(compiler) if @hoisted
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codes << Mom::TruthCheck.new(condition.slot_definition(compiler) , merge_label)
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codes << @body.to_mom(compiler)
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codes << Mom::Jump.new(cond_label)
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codes << merge_label
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end
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def each(&block)
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block.call(self)
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block.call(@condition)
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@hoisted.each(&block) if @hoisted
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@body.each(&block)
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end
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def to_s(depth = 0)
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at_depth(depth , "while (#{@condition})" , @body.to_s(depth + 1) , "end" )
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end
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end
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end
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