First steps of ConceptLexer. Need to update DefaultParser before continuing

core/ast/visitors.py

@@ -57,13 +57,13 @@ class UnreferencedNamesVisitor(ConceptNodeVisitor):
 
     def visit_Name(self, node):
         parents = get_parents(node)
-        if ("For", "target") in parents: # variable used by the 'for' iteration
+        if ("For", "target") in parents:  # variable used by the 'for' iteration
             return
 
-        if ("Call", "func") in parents: # name of the function
+        if ("Call", "func") in parents:  # name of the function
             return
 
-        if ("Assign", "targets") in parents: # variable which is assigned
+        if ("Assign", "targets") in parents:  # variable which is assigned
             return
 
         if self.can_be_discarded(self.sheerka.value(node), parents):
@@ -91,6 +91,14 @@ class UnreferencedNamesVisitor(ConceptNodeVisitor):
         return False
 
 
+class ExtractPredicateVisitor(ConceptNodeVisitor):
+    def __init__(self, variable_name):
+        self.predicates = []
+        self.variable_name = variable_name
+
+
+
+
 def get_parents(node):
     if node.parent is None:
         return []