import ast
def process(node):
  nextConditionLabel = ""
  postConditionLabel = ast.nextLabel()
  
  #emit if and if else conditions
  for condition in node.tests:
    if nextConditionLabel != "":
      ast.outputLabel( nextConditionLabel )
    nextConditionLabel = ast.nextLabel()
    dest = ast.evaluate(condition[0])
    ast.outputInBlock( "unless %s, %s" % ( dest, nextConditionLabel ) )
    ast.evaluate( condition[1] )
    ast.outputInBlock( "branch %s" % ( postConditionLabel ) )
 
  #else case
  ast.outputLabel( nextConditionLabel )
  if node.else_:
    ast.evaluate( node.else_ )
  ast.outputLabel( postConditionLabel )