add invert_then_tiebreak argument to process_line Argument Queries

This addition was neededSo the queries of the form "inside nth argument" would work properly. In particular, for these type of queries tiebreaking Needs to happen after inversion because we need to pick the closest call that satisfies the nth description with respect to its (local) parent. Otherwise, the result produced would not be even deterministic,as helpful will not be ordered!!!

Author: mpourmpoulis

queries/argument.py

@@ -62,7 +62,7 @@ def get_statement(self,origin,atok):
 
 	def process_line(self,q, root ,atok, origin  = None, select_node = None,tiebreaker = lambda x: x, 
 					line = None, transformation = None,inverse_transformation = None, priority = {}, 
-					constrained_space = (), second_tiebreaker = None
+					constrained_space = (), second_tiebreaker = None,invert_then_tiebreak  = True
 		):
 		result = None
 		alternatives = None
@@ -131,7 +131,10 @@ def process_line(self,q, root ,atok, origin  = None, select_node = None,tiebreak
 			helpful = [result] if result else []
 			if alternatives:	 
 				helpful.extend(alternatives)
-			temporary = make_flat([tiebreaker(inverse_transformation(x))  for x in helpful])
+			if invert_then_tiebreak:
+				temporary = make_flat([tiebreaker(inverse_transformation(x))  for x in helpful])
+			else:
+				temporary = tiebreaker(make_flat([inverse_transformation(x)  for x in helpful]))
 			result, alternatives = obtain_result(None,temporary)
 
 		################################################################
@@ -144,7 +147,7 @@ def process_line(self,q, root ,atok, origin  = None, select_node = None,tiebreak
 			temporary = [x[1]  for x in temporary]
 			result,alternatives = obtain_result(None,temporary)
 
-		if second_tiebreaker:
+		if result and second_tiebreaker:
 			alternatives = second_tiebreaker(result,alternatives)
 
 		if self.global_constrained_space:
@@ -359,7 +362,7 @@ def inverse_transformation(node):
 			tiebreaker = lambda x: tiebreak_on_lca(statement_node,origin,x,lca),
 			transformation = transformation,
 			inverse_transformation = inverse_transformation,
-
+			invert_then_tiebreak = False
 		)	
 		return self._backward_result(result, alternatives,build)