def test_raise(self):
r = ast.Raise(None, ast.Num(3))
self.stmt(r, "Raise with cause but no exception")
r = ast.Raise(ast.Name("x", ast.Store()), None)
self.stmt(r, "must have Load context")
r = ast.Raise(ast.Num(4), ast.Name("x", ast.Store()))
self.stmt(r, "must have Load context")
def visit_Assert(self, assert_):
"""Return the AST statements to replace the ast.Assert instance.
This rewrites the test of an assertion to provide
intermediate values and replace it with an if statement which
raises an assertion error with a detailed explanation in case
the expression is false.
"""
if isinstance(assert_.test, ast.Tuple) and len(assert_.test.elts) >= 1:
from _pytest.warning_types import PytestWarning
import warnings
warnings.warn_explicit(
PytestWarning(
"assertion is always true, perhaps remove parentheses?"),
category=None,
filename=str(self.module_path),
lineno=assert_.lineno,
)
self.statements = []
self.variables = []
self.variable_counter = itertools.count()
self.stack = []
self.on_failure = []
self.push_format_context()
# Rewrite assert into a bunch of statements.
top_condition, explanation = self.visit(assert_.test)
# Create failure message.
body = self.on_failure
negation = ast.UnaryOp(ast.Not(), top_condition)
self.statements.append(ast.If(negation, body, []))
if assert_.msg:
assertmsg = self.helper("format_assertmsg", assert_.msg)
explanation = "\n>assert " + explanation
else:
assertmsg = ast.Str("")
explanation = "assert " + explanation
template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))
msg = self.pop_format_context(template)
fmt = self.helper("format_explanation", msg)
err_name = ast.Name("AssertionError", ast.Load())
exc = ast_Call(err_name, [fmt], [])
if sys.version_info[0] >= 3:
raise_ = ast.Raise(exc, None)
else:
raise_ = ast.Raise(exc, None, None)
body.append(raise_)
# Clear temporary variables by setting them to None.
if self.variables:
variables = [
ast.Name(name, ast.Store()) for name in self.variables
]
clear = ast.Assign(variables, _NameConstant(None))
self.statements.append(clear)
# Fix line numbers.
for stmt in self.statements:
set_location(stmt, assert_.lineno, assert_.col_offset)
return self.statements
def visitWith(self, node):
i = self.withcnt()
abc, exc = 'WiTh_CoNtExT__%i' % i, 'WiTh_ExC__%i' % i
lno = node.lineno
self.visit(node.expr)
self.visit(node.code)
rbc = hasRBC(node.code)
stmts = []
stmts.append(
ast_Assign(abc,
ast.CallFunc(ast.Getattr(node.expr, '__context__'),
[])))
if rbc:
stmts.append(ast_Assign(exc, ast.Const((None, None, None))))
enter = ast.CallFunc(ast_Getattr(abc, '__enter__'), [])
if node.var:
enter = ast_Assign(node.var, enter)
else:
enter = ast.Discard(enter)
stmts.append(enter)
if rbc:
stmts.append(
ast.TryFinally(
ast.TryExcept(
node.code,
[(None, None,
ast.Stmt([
ast_Assign(
exc,
ast.CallFunc(ast_Getattr('sys', 'exc_info'),
[])),
ast.Raise(None, None, None, lno)
]))], None, lno),
ast.Discard(
ast.CallFunc(ast_Getattr(abc, '__exit__'), [],
ast.Name(exc, 0))), lno))
else:
stmts.append(
ast.TryExcept(
node.code,
[(None, None,
ast.Stmt([
ast.Discard(
ast.CallFunc(
ast_Getattr(abc, '__exit__'), [],
ast.CallFunc(ast_Getattr('sys', 'exc_info'),
[]))),
ast.Raise(None, None, None, lno)
]))],
ast.Stmt([
ast.Discard(
ast.CallFunc(ast_Getattr(abc, '__exit__'),
3 * [ast.Const(None)]))
]), lno))
make_copy(node, ast.Stmt(stmts))
def visitRaise(self, n, *args):
if flags.PY_VERSION == 3:
exc = self.dispatch(n.exc, *args) if n.exc else None
cause = self.dispatch(n.cause, *args) if n.cause else None
return ast.Raise(exc=exc, cause=cause)
elif flags.PY_VERSION == 2:
type = self.dispatch(n.type, *args) if n.type else None
inst = self.dispatch(n.inst, *args) if n.inst else None
tback = self.dispatch(n.tback, *args) if n.tback else None
return ast.Raise(type=type, inst=inst, tback=tback)
def visit_Assert(self, node):
node = self.generic_visit(node)
if node.msg:
inst = mk_call("AssertionError", [node.msg])
raise_stmt = ast.Raise(type=inst, inst=None, tback=None)
else:
raise_stmt = ast.Raise(type=mk_name("AssertionError"), inst=None, tback=None)
check = ast.If(test=mk_not(node.test), body=[raise_stmt], orelse=[])
return ast.If(test=mk_name("__debug__"), body=[check], orelse=[])
def generate(self, element:Element, GC:GenerationContext):
acode = element.code
#assert isinstance(acode, Form)
if len(acode) > 1:
with GC.let(domain=ExDom):
exception_obj_code = GC.generate(acode[1])
return ast.Raise(exception_obj_code, None) # Fix none to allow raise x from y syntax
else:
assert len(acode) == 1
return ast.Raise()
def visit_Assert(self, assert_):
"""Return the AST statements to replace the ast.Assert instance.
This re-writes the test of an assertion to provide
intermediate values and replace it with an if statement which
raises an assertion error with a detailed explanation in case
the expression is false.
"""
self.statements = []
self.variables = []
self.variable_counter = itertools.count()
self.stack = []
self.on_failure = []
self.push_format_context()
# Rewrite assert into a bunch of statements.
top_condition, explanation = self.visit(assert_.test)
# Create failure message.
body = self.on_failure
negation = ast.UnaryOp(ast.Not(), top_condition)
self.statements.append(ast.If(negation, body, []))
if assert_.msg:
assertmsg = self.helper('format_assertmsg', assert_.msg)
explanation = "\n>assert " + explanation
else:
assertmsg = ast.Str("")
explanation = "assert " + explanation
template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))
msg = self.pop_format_context(template)
fmt = self.helper("format_explanation", msg)
err_name = ast.Name("AssertionError", ast.Load())
exc = ast.Call(err_name, [fmt], [], None, None)
if sys.version_info[0] >= 3:
raise_ = ast.Raise(exc, None)
else:
raise_ = ast.Raise(exc, None, None)
body.append(raise_)
# Clear temporary variables by setting them to None.
if self.variables:
variables = [
ast.Name(name, ast.Store()) for name in self.variables
]
clear = ast.Assign(variables, ast.Name("None", ast.Load()))
self.statements.append(clear)
# Fix line numbers.
for stmt in self.statements:
set_location(stmt, assert_.lineno, assert_.col_offset)
return self.statements
def raise_exception(self,
node,
exc=None,
msg='',
expr=None,
fname=None,
lineno=None,
func=None):
"add an exception"
if self.error is None:
self.error = []
if expr is None:
expr = self.expr
if fname is None:
fname = self.fname
if lineno is None:
lineno = self.lineno
if func is None:
func = self.func
if len(self.error) > 0 and not isinstance(node, ast.Module):
msg = '%s' % msg
err = LarchExceptionHolder(node=node,
exc=exc,
msg=msg,
expr=expr,
fname=fname,
lineno=lineno,
func=func)
self._interrupt = ast.Raise()
self.error.append(err)
self.symtable._sys.last_error = err
def visit_Assign(self, node: ast.Assign) -> Any:
self.generic_visit(node)
target = node.targets[0]
if not isinstance(target, ast.Name):
return node
expr = ast.Name(id=target.id, ctx=ast.Load())
name = target.id
check = ast.Try(
body=[ast.Expr(expr)],
handlers=[
ast.ExceptHandler(
type=ast.Tuple(
elts=[ast.Name(id=_n(NameError), ctx=ast.Load())],
ctx=ast.Load(),
),
name=None,
body=[ast.Expr(value=ast.Constant(value=Ellipsis))],
)
],
orelse=[
ast.Raise(
exc=ast.Call(
func=ast.Name(
id=_n(ImmutabilityGuard.proxy_Assign), ctx=ast.Load()
),
args=[ast.Constant(value=name)],
keywords=[],
),
cause=None,
)
],
finalbody=[],
)
return [check, node]
def __init__(self, ignore_exceptions=(), catch_exception=None):
raise_cmd = ast.Raise()
if sys.version_info > (3, 0):
start_debug_cmd = ast.Expr(value=ast.Call(
ast.Name("start_debugging", ast.Load()),
[],
[],
))
else:
start_debug_cmd = ast.Expr(value=ast.Call(
ast.Name("start_debugging", ast.Load()), [], [], None, None))
catch_exception_node = None
if catch_exception is not None:
catch_exception_node = ast.Name(catch_exception.__name__,
ast.Load())
self.exception_handlers = [
ast.ExceptHandler(type=catch_exception_node,
name=None,
body=[start_debug_cmd])
]
for exception_class in ignore_exceptions:
ignore_exception_node = ast.Name(exception_class.__name__,
ast.Load())
self.exception_handlers.insert(
0,
ast.ExceptHandler(type=ignore_exception_node,
name=None,
body=[raise_cmd]))
def p_raise_stmt4(self, p):
''' raise_stmt : RAISE test COMMA test COMMA test '''
raise_stmt = ast.Raise()
raise_stmt.type = p[2]
raise_stmt.inst = p[4]
raise_stmt.tback = p[6]
p[0] = raise_stmt
def visit_TryFinally(self, node):
node.body.extend(node.finalbody)
node.finalbody.append(ast.Raise(None, None, None))
self.update = True
return ast.TryExcept(node.body,
[ast.ExceptHandler(None, None, node.finalbody)],
[])
def visit_FunctionDef(self, node):
if len(preconditions[node.name]) == 0:
return node
ast_name = ast.Name(id="PreconditionException", ctx=ast.Load())
node_exception = ast.Raise(exc=ast_name, cause=None)
precondition_node = preconditions[node.name][0]
assert_node = ast.Assert(precondition_node,
lineno=node.lineno,
col_offset=node.col_offset,
end_lineno=node.lineno,
end_col_offset=node.end_col_offset)
ast_exception = ast.Name(id="Exception", ctx=ast.Load())
handler = ast.ExceptHandler(type=ast_exception,
name=None,
body=[node_exception])
try_node = ast.Try(body=[assert_node],
handlers=[handler],
orelse=[],
finalbody=[node.body])
#if_node = ast.If(precondition_node,[node.body],[node_exception])
node_res = ast.FunctionDef(node.name,
node.args, [try_node],
node.decorator_list,
node.returns,
node.type_comment,
lineno=node.lineno,
col_offset=node.col_offset,
end_lineno=node.lineno,
end_col_offset=node.end_col_offset)
ast.fix_missing_locations(node_res)
return node_res
def visit_Raise(self, node: Raise, *args, **kwargs) -> C.Raise:
exc = self.visit(node.exc, *args, **kwargs)
cause = self.visit(node.cause, *args, **kwargs)
return C.Raise(
exc=exc,
cause=cause,
)
def visit_Assert(self, t):
t = self.generic_visit(t)
result = ast.If(t.test, [], [
ast.Raise(
Call(ast.Name('AssertionError', load),
[] if t.msg is None else [t.msg]), None)
])
return ast.copy_location(result, t)
def make_raise():
"""Raise(expr? exc, expr? cause)"""
return ast.Raise(
exc=ast.Name(id="exception", ctx=ast.Load()),
# Causes aren't that common so let's not include them
# in the default raise
cause=None # ast.Name(id="cause", ctx=ast.Load())
)
def compile_throw_expression(self, expr):
expr.pop(0)
exc = self.compile(expr.pop(0)) if expr else None
return ast.Raise(lineno=expr.start_line,
col_offset=expr.start_column,
type=exc,
exc=exc,
inst=None,
tback=None)
def wrap_with_try(self, node):
"""Wrap an ast node in a 'try' node to enter debug on exception."""
handlers = []
if self.ignore_exceptions is None:
handlers.append(ast.ExceptHandler(type=None,
name=None,
body=[ast.Raise()]))
else:
ignores_nodes = self.ignore_exceptions
handlers.append(ast.ExceptHandler(type=ast.Tuple(ignores_nodes,
ast.Load()),
name=None,
body=[ast.Raise()]))
if self.catch_exception is None or \
get_node_value(self.catch_exception) not in \
(get_node_value(ast_node)
for ast_node in self.ignore_exceptions):
call_extra_parameters = [] if IS_PYTHON_3 else [None, None]
start_debug_cmd = ast.Expr(
value=ast.Call(ast.Name("start_debugging", ast.Load()),
[], [], *call_extra_parameters))
catch_exception_type = None
if self.catch_exception is not None:
catch_exception_type = self.catch_exception
handlers.append(ast.ExceptHandler(type=catch_exception_type,
name=None,
body=[start_debug_cmd]))
try_except_extra_params = {"finalbody": []} if IS_PYTHON_3 else {}
new_node = self.ast_try_except(orelse=[], body=[node],
handlers=handlers,
**try_except_extra_params)
return ast.copy_location(new_node, node)
def visit_Assert(self, assert_):
if assert_.msg:
# There's already a message. Don't mess with it.
return [assert_]
self.statements = []
self.cond_chain = ()
self.variables = []
self.variable_counter = itertools.count()
self.stack = []
self.on_failure = []
self.push_format_context()
# Rewrite assert into a bunch of statements.
top_condition, explanation = self.visit(assert_.test)
# Create failure message.
body = self.on_failure
negation = ast.UnaryOp(ast.Not(), top_condition)
self.statements.append(ast.If(negation, body, []))
explanation = "assert " + explanation
template = ast.Str(explanation)
msg = self.pop_format_context(template)
fmt = self.helper("format_explanation", msg)
err_name = ast.Name("AssertionError", ast.Load())
if sys.hexversion >= 0x3000000:
exc = ast.Call(err_name, [fmt], [])
else:
exc = ast.Call(err_name, [fmt], [], None, None)
if sys.version_info[0] >= 3:
raise_ = ast.Raise(exc, None)
else:
raise_ = ast.Raise(exc, None, None)
body.append(raise_)
# Clear temporary variables by setting them to None.
if self.variables:
variables = [
ast.Name(name, ast.Store()) for name in self.variables
]
clear = ast.Assign(variables, ast.Name("None", ast.Load()))
self.statements.append(clear)
# Fix line numbers.
for stmt in self.statements:
set_location(stmt, assert_.lineno, assert_.col_offset)
return self.statements
def visit_ImportFrom(self, node):
if node.module == self.import_name:
replacement = ast.Raise(exc=ast.Call(
func=ast.Name(id='ImportError', ctx=ast.Load()),
args=[],
keywords=[],
),
cause=None)
return ast.copy_location(replacement, node)
else:
return node
def r_single_keyword_stmt(node: ast.Name, ctx: Context, rule_type):
if rule_type == ast.Yield:
new_node = ast.Yield(value=None)
elif rule_type == ast.Raise:
new_node = ast.Raise(exc=None, cause=None)
else:
new_node = rule_type()
return copy_lineinfo(node, new_node)
def visit_Raise(self, node):
if isinstance(node.exc, gast.Call) and \
isinstance(node.exc.func, gast.Attribute) and \
node.exc.func.attr == 'with_traceback':
raised = self._visit(node.exc.func.value)
traceback = self._visit(node.exc.args[0])
else:
raised = self._visit(node.exc)
traceback = None
new_node = ast.Raise(raised, None, traceback)
ast.copy_location(new_node, node)
return new_node
def visit_Raise(self, node):
if isinstance(node.exc, ast.Name):
import builtins
exc_cls = getattr(builtins, node.exc.id, None)
if isinstance(exc_cls, type) and issubclass(exc_cls, BaseException):
return self.visit(ast.copy_location(
ast.Raise(
exc=ast.Call(func=node.exc, args=[], keywords=[]),
cause=node.cause
),
node
))
return self.generic_visit(node)
def raise_type_violation_error_ast(variable_name, expected_type):
return ast.Raise(
exc=ast.Call(
func=load('TypeViolationError'),
args=[
ast.Str(s=variable_name),
load(expected_type),
type_ast(variable_name),
],
keywords=[],
),
cause=None,
)
def arg_check(bs, args, should):
if map(id, args) == map(id, should): return False
import mypyable
bs.this.append(
ast.Raise(
type=ast.Call(
func=mypyable.TypeError_impl.load,
args=[ast.Str(s="expected %r, got %r" % (should, args))],
keywords=[],
starargs=None,
kwargs=None,
),
inst=None,
tback=None,
), )
return True
def test_wrong_arg(self):
bad = ast.Raise() # doesn't matter what is inside
args = ast.arguments(args=[bad], defaults=[])
the_ast = ast.FunctionDef(name="haha",
args=args,
body=[],
decorator_list=[])
if sys.version_info < (2, 7):
self.assertRaises(support.schema.SchemaError,
self.make_verification_callable(the_ast))
else:
with self.capture_error() as cap:
self.schema.verify(the_ast)
self.assertIn(str(cap.exception), [
"At arguments.args[0]: Cannot be a Raise",
"At arguments.args[0]: Expecting arg but got Raise"
])
def t_wrap_try_catch(the_ast, uid=1):
if len(the_ast.body) == 0 or not isinstance(the_ast.body[0],
ast.FunctionDef):
return False, the_ast
temp = ast.Try(body=the_ast.body[0].body,
handlers=[
ast.ExceptHandler(type=ast.Name(id='Exception',
ctx=ast.Load()),
name='REPLACME' + str(uid),
body=[ast.Raise()])
],
orelse=[],
finalbody=[])
the_ast.body[0].body = [temp]
return True, the_ast
def visit_Return(self, node: ast.Return):
if isinstance(node.value, ast.Tuple):
rhs_length = len(node.value.elts)
else:
rhs_length = 1
if isinstance(self.target_node, ast.Tuple):
lhs_length = len(self.target_node.elts)
else:
lhs_length = 1
if lhs_length == rhs_length:
return ast.Assign(
targets=[self.target_node],
value=node.value,
lineno=node.lineno,
col_offset=node.col_offset,
)
else:
return ast.Raise(lineno=node.lineno, col_offset=node.col_offset)
def raise_exception(self, node, exc=None, msg='', expr=None, lineno=None):
"""Add an exception."""
if self.error is None:
self.error = []
if expr is None:
expr = self.expr
if len(self.error) > 0 and not isinstance(node, ast.Module):
msg = '%s' % msg
err = ExceptionHolder(node, exc=exc, msg=msg, expr=expr, lineno=lineno)
self._interrupt = ast.Raise()
self.error.append(err)
if self.error_msg is None:
self.error_msg = "at expr='%s'" % (self.expr)
elif len(msg) > 0:
self.error_msg = msg
if exc is None:
try:
exc = self.error[0].exc
except:
exc = RuntimeError
raise exc(self.error_msg)
def setter_body(item):
"""Construct the body of the setter function.
"""
new_value = Name(id="new", ctx=ast.Load())
inst_var = Attribute(value=Name(id="self", ctx=ast.Load()),
attr=f"_{item.var}",
ctx=ast.Store())
comp_node = Compare(
left=Num(n=item.lower),
ops=[ast.Lt(), ast.Lt()],
comparators=[new_value, Num(n=item.upper)],
)
assign_stmt = ast.Assign(targets=[inst_var], value=new_value)
except_msg = f"value outside of range {item.lower} < {item.var} < {item.upper}"
exc = ast.Call(
func=Name(id="ValueError", ctx=ast.Load()),
args=[ast.Str(s=except_msg)],
keywords=[],
)
else_body = ast.Raise(exc=exc, cause=None)
if_node = ast.If(test=comp_node, body=[assign_stmt], orelse=[else_body])
return if_node