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bpo-35029: Replace the SyntaxWarning exception with a SyntaxError. (GH-9999)

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If SyntaxWarning was raised as an exception, it will be replaced
with a SyntaxError for better error reporting.
This commit is contained in:
Serhiy Storchaka 2018-10-21 10:09:39 +03:00 • committed by GitHub
parent 2f73ed6913
commit d31e7730cd
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 42 additions and 11 deletions
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9
Lib/test/test_grammar.py
View file

@ -5,6 +5,7 @@
import inspect
import unittest
import sys
import warnings
# testing import *
from sys import *
@ -1099,6 +1100,14 @@ def testAssert2(self):
else:
self.fail("AssertionError not raised by 'assert False'")
with self.assertWarnsRegex(SyntaxWarning, 'assertion is always true'):
compile('assert(x, "msg")', '<testcase>', 'exec')
with warnings.catch_warnings():
warnings.filterwarnings('error', category=SyntaxWarning)
with self.assertRaisesRegex(SyntaxError, 'assertion is always true'):
compile('assert(x, "msg")', '<testcase>', 'exec')
compile('assert x, "msg"', '<testcase>', 'exec')
### compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef
# Tested below

2
Misc/NEWS.d/next/Core and Builtins/2018-10-20-10-26-15.bpo-35029.t4tZcQ.rst Normal file
View file

@ -0,0 +1,2 @@
:exc:`SyntaxWarning` raised as an exception at code generation time will be
now replaced with a :exc:`SyntaxError` for better error reporting.

42
Python/compile.c
View file

@ -174,6 +174,7 @@ static int compiler_addop(struct compiler *, int);
static int compiler_addop_i(struct compiler *, int, Py_ssize_t);
static int compiler_addop_j(struct compiler *, int, basicblock *, int);
static int compiler_error(struct compiler *, const char *);
static int compiler_warn(struct compiler *, const char *);
static int compiler_nameop(struct compiler *, identifier, expr_context_ty);
static PyCodeObject *compiler_mod(struct compiler *, mod_ty);
@ -2971,7 +2972,6 @@ compiler_assert(struct compiler *c, stmt_ty s)
{
static PyObject *assertion_error = NULL;
basicblock *end;
PyObject* msg;
if (c->c_optimize)
return 1;
@ -2981,18 +2981,13 @@ compiler_assert(struct compiler *c, stmt_ty s)
return 0;
}
if (s->v.Assert.test->kind == Tuple_kind &&
asdl_seq_LEN(s->v.Assert.test->v.Tuple.elts) > 0) {
msg = PyUnicode_FromString("assertion is always true, "
"perhaps remove parentheses?");
if (msg == NULL)
return 0;
if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg,
c->c_filename, c->u->u_lineno,
NULL, NULL) == -1) {
Py_DECREF(msg);
asdl_seq_LEN(s->v.Assert.test->v.Tuple.elts) > 0)
{
if (!compiler_warn(c, "assertion is always true, "
"perhaps remove parentheses?"))
{
return 0;
}
Py_DECREF(msg);
}
end = compiler_new_block(c);
if (end == NULL)
@ -4793,6 +4788,31 @@ compiler_error(struct compiler *c, const char *errstr)
return 0;
}
/* Emits a SyntaxWarning and returns 1 on success.
If a SyntaxWarning raised as error, replaces it with a SyntaxError
and returns 0.
*/
static int
compiler_warn(struct compiler *c, const char *errstr)
{
PyObject *msg = PyUnicode_FromString(errstr);
if (msg == NULL) {
return 0;
}
if (PyErr_WarnExplicitObject(PyExc_SyntaxWarning, msg, c->c_filename,
c->u->u_lineno, NULL, NULL) < 0)
{
Py_DECREF(msg);
if (PyErr_ExceptionMatches(PyExc_SyntaxWarning)) {
PyErr_Clear();
return compiler_error(c, errstr);
}
return 0;
}
Py_DECREF(msg);
return 1;
}
static int
compiler_handle_subscr(struct compiler *c, const char *kind,
expr_context_ty ctx)