Class: TPPlus::Nodes::WhileNode

Inherits:
Object
  • Object
show all
Defined in:
lib/tp_plus/nodes/while_node.rb

Instance Method Summary collapse

Constructor Details

#initialize(condition_node, block) ⇒ WhileNode

Returns a new instance of WhileNode.



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# File 'lib/tp_plus/nodes/while_node.rb', line 4

def initialize(condition_node, block)
  @condition_node = condition_node
  @block = block.flatten.reject {|n| n.is_a?(TerminatorNode) }
end

Instance Method Details

#block(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 33

def block(context)
  @block.inject("") {|s,n| s << "#{n.eval(context)} ;\n" }
end

#bottom_label(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 13

def bottom_label(context)
  @bottom_label ||= context.next_label
end

#condition(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 28

def condition(context)
  @condition_node.eval(context, opposite: true)
end

#eval(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 37

def eval(context)
  "LBL[#{top_label(context)}] ;\n#{if_statement(context)}#{block(context)}JMP LBL[#{top_label(context)}] ;\nLBL[#{bottom_label(context)}]"
end

#if_statement(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 23

def if_statement(context)
  "IF #{parens(condition(context), context)},JMP LBL[#{bottom_label(context)}] ;\n"
end

#parens(s, context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 17

def parens(s, context)
  return s unless @condition_node.requires_mixed_logic?(context)

  "(#{s})"
end

#top_label(context) ⇒ Object 



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# File 'lib/tp_plus/nodes/while_node.rb', line 9

def top_label(context)
  @top_label ||= context.next_label
end