def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
python类excepthandler()的实例源码
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos):
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos)
elif value is not None:
self._assertTrueorder(value, parent_pos)
def _assertTrueorder(self, ast_node, parent_pos, reverse_check = False):
def should_reverse_check(parent, child):
# In some situations, the children of nodes occur before
# their parents, for example in a.b.c, a occurs before b
# but a is a child of b.
if isinstance(parent, ast.Call):
if parent.func == child:
return True
if isinstance(parent, (ast.Attribute, ast.Subscript)):
return True
return False
if not isinstance(ast_node, ast.AST) or ast_node._fields is None:
return
if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):
node_pos = (ast_node.lineno, ast_node.col_offset)
if reverse_check:
self.assertTrue(node_pos <= parent_pos)
else:
self.assertTrue(node_pos >= parent_pos)
parent_pos = (ast_node.lineno, ast_node.col_offset)
for name in ast_node._fields:
value = getattr(ast_node, name)
if isinstance(value, list):
for child in value:
self._assertTrueorder(child, parent_pos,
should_reverse_check(ast_node, child))
elif value is not None:
self._assertTrueorder(value, parent_pos,
should_reverse_check(ast_node, value))
def occursIn(sub, super):
"""Does the first AST occur as a subtree of the second?"""
superStatementTypes = [ ast.Module, ast.Interactive, ast.Suite,
ast.FunctionDef, ast.ClassDef, ast.For,
ast.While, ast.If, ast.With, ast.Try,
ast.ExceptHandler ]
if (not isinstance(super, ast.AST)):
return False
if type(sub) == type(super) and compareASTs(sub, super, checkEquality=True) == 0:
return True
# we know that a statement can never occur in an expression
# (or in a non-statement-holding statement), so cut the search off now to save time.
if isStatement(sub) and type(super) not in superStatementTypes:
return False
for child in ast.iter_child_nodes(super):
if occursIn(sub, child):
return True
return False
def test_try(self):
p = ast.Pass()
t = ast.Try([], [], [], [p])
self.stmt(t, "empty body on Try")
t = ast.Try([ast.Expr(ast.Name("x", ast.Store()))], [], [], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], [], [], [])
self.stmt(t, "Try has neither except handlers nor finalbody")
t = ast.Try([p], [], [p], [p])
self.stmt(t, "Try has orelse but no except handlers")
t = ast.Try([p], [ast.ExceptHandler(None, "x", [])], [], [])
self.stmt(t, "empty body on ExceptHandler")
e = [ast.ExceptHandler(ast.Name("x", ast.Store()), "y", [p])]
self.stmt(ast.Try([p], e, [], []), "must have Load context")
e = [ast.ExceptHandler(None, "x", [p])]
t = ast.Try([p], e, [ast.Expr(ast.Name("x", ast.Store()))], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], e, [p], [ast.Expr(ast.Name("x", ast.Store()))])
self.stmt(t, "must have Load context")
def test_try(self):
p = ast.Pass()
t = ast.Try([], [], [], [p])
self.stmt(t, "empty body on Try")
t = ast.Try([ast.Expr(ast.Name("x", ast.Store()))], [], [], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], [], [], [])
self.stmt(t, "Try has neither except handlers nor finalbody")
t = ast.Try([p], [], [p], [p])
self.stmt(t, "Try has orelse but no except handlers")
t = ast.Try([p], [ast.ExceptHandler(None, "x", [])], [], [])
self.stmt(t, "empty body on ExceptHandler")
e = [ast.ExceptHandler(ast.Name("x", ast.Store()), "y", [p])]
self.stmt(ast.Try([p], e, [], []), "must have Load context")
e = [ast.ExceptHandler(None, "x", [p])]
t = ast.Try([p], e, [ast.Expr(ast.Name("x", ast.Store()))], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], e, [p], [ast.Expr(ast.Name("x", ast.Store()))])
self.stmt(t, "must have Load context")
def get_coverable_nodes(cls):
return {
ast.Assert,
ast.Assign,
ast.AugAssign,
ast.Break,
ast.Continue,
ast.Delete,
ast.Expr,
ast.Global,
ast.Import,
ast.ImportFrom,
ast.Nonlocal,
ast.Pass,
ast.Raise,
ast.Return,
ast.FunctionDef,
ast.ClassDef,
ast.TryExcept,
ast.TryFinally,
ast.ExceptHandler,
ast.If,
ast.For,
ast.While,
}
def get_coverable_nodes(cls):
return {
ast.Assert,
ast.Assign,
ast.AugAssign,
ast.Break,
ast.Continue,
ast.Delete,
ast.Expr,
ast.Global,
ast.Import,
ast.ImportFrom,
ast.Nonlocal,
ast.Pass,
ast.Raise,
ast.Return,
ast.ClassDef,
ast.FunctionDef,
ast.Try,
ast.ExceptHandler,
ast.If,
ast.For,
ast.While,
}
def test_try(self):
p = ast.Pass()
t = ast.Try([], [], [], [p])
self.stmt(t, "empty body on Try")
t = ast.Try([ast.Expr(ast.Name("x", ast.Store()))], [], [], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], [], [], [])
self.stmt(t, "Try has neither except handlers nor finalbody")
t = ast.Try([p], [], [p], [p])
self.stmt(t, "Try has orelse but no except handlers")
t = ast.Try([p], [ast.ExceptHandler(None, "x", [])], [], [])
self.stmt(t, "empty body on ExceptHandler")
e = [ast.ExceptHandler(ast.Name("x", ast.Store()), "y", [p])]
self.stmt(ast.Try([p], e, [], []), "must have Load context")
e = [ast.ExceptHandler(None, "x", [p])]
t = ast.Try([p], e, [ast.Expr(ast.Name("x", ast.Store()))], [p])
self.stmt(t, "must have Load context")
t = ast.Try([p], e, [p], [ast.Expr(ast.Name("x", ast.Store()))])
self.stmt(t, "must have Load context")
def mutate_ExceptHandler(self, node):
if node.body and isinstance(node.body[0], ast.Raise):
raise MutationResign()
return ast.ExceptHandler(type=node.type, name=node.name, body=[ast.Raise()])
def mutate_ExceptHandler(self, node):
if len(node.body) == 1 and isinstance(node.body[0], ast.Pass):
raise MutationResign()
return ast.ExceptHandler(type=node.type, name=node.name, body=[ast.Pass()])
def __init__(self):
super().__init__()
for node_class in self.get_coverable_nodes():
visit_method_name = 'visit_' + node_class.__name__
if not hasattr(self, visit_method_name):
if node_class == ast.ExceptHandler:
setattr(self, visit_method_name, self.inject_inside_visit)
else:
setattr(self, visit_method_name, self.inject_before_visit)
def visit_Attribute(self, node):
call_path = list(self.compose_call_path(node))
if '.'.join(call_path) == 'sys.maxint':
self.errors.append(
B304(node.lineno, node.col_offset)
)
elif len(call_path) == 2 and call_path[1] == 'message':
name = call_path[0]
for elem in reversed(self.node_stack[:-1]):
if isinstance(elem, ast.ExceptHandler) and elem.name == name:
self.errors.append(
B306(node.lineno, node.col_offset)
)
break
def node_defines_name(node, name):
"""
Check if the specified statement node defines symbol *name*.
:param node: The node to check.
:param name: The symbol name to check.
:return: Whether or not the node defines the symbole specified.
:rtype: bool
"""
if isinstance(name, ast.Name):
name = name.id
if isinstance(node, ast.Assign):
if node_targets_name(node, name):
return True
if isinstance(node.value, (ast.DictComp, ast.ListComp, ast.SetComp)):
return node_defines_name(node.value, name)
elif isinstance(node, ast.ClassDef):
return node.name == name
# these ones all assume the iterable will be executed at least once
elif isinstance(node, (ast.DictComp, ast.GeneratorExp, ast.ListComp, ast.SetComp)):
for generator in node.generators:
target = generator.target
if isinstance(target, ast.Name):
if target.id == name:
return True
continue
for child_node in iter_child_expr_nodes(target):
if isinstance(child_node, ast.Name) and child_node.id == name:
return True
return False
elif isinstance(node, ast.ExceptHandler):
if isinstance(node.name, ast.Name):
return node.name.id == name
elif isinstance(node.name, str):
return node.name == name
elif isinstance(node, ast.Expr):
if isinstance(node.value, (ast.DictComp, ast.GeneratorExp, ast.ListComp, ast.SetComp)):
return node_defines_name(node.value, name)
elif isinstance(node, ast.For):
return isinstance(node.target, ast.Name) and node.target.id == name
elif isinstance(node, ast.FunctionDef):
return node.name == name
elif isinstance(node, (ast.Import, ast.ImportFrom)):
return next((alias for alias in node.names if (alias.asname or alias.name) == name), None) is not None
return False
