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.



4
5
6
7
 
# 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 



27
28
29
 
# File 'lib/tp_plus/nodes/while_node.rb', line 27

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

#bottom_label(context) ⇒ Object 



13
14
15
 
# File 'lib/tp_plus/nodes/while_node.rb', line 13

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

#condition(context) ⇒ Object 



22
23
24
 
# File 'lib/tp_plus/nodes/while_node.rb', line 22

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

#eval(context) ⇒ Object 



31
32
33
 
# File 'lib/tp_plus/nodes/while_node.rb', line 31

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 



17
18
19
 
# File 'lib/tp_plus/nodes/while_node.rb', line 17

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

#top_label(context) ⇒ Object 



9
10
11
 
# File 'lib/tp_plus/nodes/while_node.rb', line 9

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