flow analysis preparation

jedi/evaluate/flow_analysis.py

@@ -1,7 +1,35 @@
+from jedi.parser.representation import Flow
 
-NOT_REACHABLE = object()
-REACHABLE = object()
-UNSURE = object()
 
-def break_check(scope):
+class Status(object):
+    def __init__(self, value):
+        self._value = value
+
+    def __eq__(self, other):
+        return self._value == other.value
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __and__(self, other):
+        if UNSURE in (self, other):
+            return other
+        else:
+            return REACHABLE if self._value and other._value else NOT_REACHABLE
+
+
+NOT_REACHABLE = Status(True)
+REACHABLE = Status(False)
+UNSURE = Status(None)
+
+
+def break_check(evaluator, base_scope, element_scope):
+    reachable = REACHABLE
+    if isinstance(element_scope, Flow):
+        if element_scope.command == 'if' and element_scope.inputs:
+            result = evaluator.eval_statement(element_scope.inputs[0])
+            print(result)
+
+    if base_scope != element_scope.parent:
+        return reachable & break_check(base_scope, element_scope.parent)
     return UNSURE