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a first very simple implementation of reachable/unreachable return statements.

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Dave Halter
2014-08-05 17:02:16 +02:00
parent f5e49e3218
commit 15ec0a77fe
3 changed files with 22 additions and 8 deletions
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25
jedi/evaluate/flow_analysis.py
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@@ -2,8 +2,12 @@ from jedi.parser.representation import Flow
class Status(object):
def __init__(self, value):
lookup_table = {}
def __init__(self, value, name):
self._value = value
self._name = name
Status.lookup_table[value] = self
def __eq__(self, other):
return self._value == other.value
@@ -15,20 +19,27 @@ class Status(object):
if UNSURE in (self, other):
return other
else:
return REACHABLE if self._value and other._value else NOT_REACHABLE
return REACHABLE if self._value and other._value else UNREACHABLE
def __repr__(self):
return '<%s: %s>' % (type(self).__name__, self._name)
NOT_REACHABLE = Status(True)
REACHABLE = Status(False)
UNSURE = Status(None)
REACHABLE = Status(True, 'reachable')
UNREACHABLE = Status(False, 'unreachable')
UNSURE = Status(None, 'unsure')
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)
types = evaluator.eval_statement(element_scope.inputs[0])
values = set(x.py__bool__() for x in types)
if len(values) == 1:
return Status.lookup_table[values.pop()]
else:
return UNSURE
if base_scope != element_scope.parent:
return reachable & break_check(base_scope, element_scope.parent)