start using precedences, working good with only a few test fails

jedi/evaluate/__init__.py

@@ -142,13 +142,27 @@ class Evaluator(object):
         """
         debug.dbg('eval_expression_list: %s', expression_list)
         result = []
+        p = precedence.create_precedence(expression_list)
+        return self._process_precedence_element(p)
         calls_iterator = iter(expression_list)
         for each in calls_iterator:
             result += self.eval_element(each)
         return set(result)
 
-    def _eval_precedence(evaluator, precedence):
-        evaluator
+    def _process_precedence_element(self, el):
+        if el is None:
+            return None
+        else:
+            if isinstance(el, precedence.Precedence):
+                return self._eval_precedence(el)
+            else:
+                # normal element, no operators
+                return self.eval_element(el)
+
+    def _eval_precedence(self, _precedence):
+        left = self._process_precedence_element(_precedence.left)
+        right = self._process_precedence_element(_precedence.right)
+        return precedence.calculate(left, _precedence.operator, right)
 
     def eval_element(self, element):
         if pr.Array.is_type(element, pr.Array.NOARRAY):

jedi/evaluate/precedence.py

@@ -73,7 +73,7 @@ class Precedence(object):
 
 
 def create_precedence(expression_list):
-    iterator = PushBackIterator(expression_list)
+    iterator = PushBackIterator(iter(expression_list))
     return _check_operator(iterator)
 
 
@@ -149,3 +149,7 @@ def _check_operator(iterator, priority=PythonGrammar.LOWEST_PRIORITY):
         else:
             left = Precedence(left, str(operator), right)
     return left
+
+
+def calculate(left, operator, right):
+    return left + right

test/test_evaluate/test_precedence.py

@@ -8,7 +8,7 @@ def parse_tree(statement_string, is_slice=False):
     if is_slice:
         # get the part of the execution that is the slice
         stmt = stmt.expression_list()[0].execution[0]
-    iterable = iter(stmt.expression_list())
+    iterable = stmt.expression_list()
     pr = precedence.create_precedence(iterable)
     if isinstance(pr, precedence.Precedence):
         return pr.parse_tree(strip_literals=True)