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bpo-40334: Fix test_peg_parser to actually use the old parser (GH-19778)

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Now that the default parser is the new PEG parser, ast.parse uses it, which means that we don't actually test something in test_peg_parser. This commit introduces a new keyword argument (`oldparser`) for `_peg_parser.parse_string` for specifying that a string needs to be parsed with the old parser. This keyword argument is used in the tests to actually compare the ASTs the new parser generates with those generated by the old parser.
This commit is contained in:
Lysandros Nikolaou 2020-04-30 01:53:30 +03:00 • committed by GitHub
parent 360371f79c
commit 69e802ed81
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 15 additions and 8 deletions
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9
Lib/test/test_peg_parser.py
View file

@ -699,7 +699,7 @@ def test_correct_ast_generation_on_source_files(self) -> None:
self.maxDiff = None
for source in TEST_SOURCES:
actual_ast = peg_parser.parse_string(source)
expected_ast = ast.parse(source)
expected_ast = peg_parser.parse_string(source, oldparser=True)
self.assertEqual(
ast.dump(actual_ast, include_attributes=True),
ast.dump(expected_ast, include_attributes=True),
@ -721,12 +721,11 @@ def test_incorrect_ast_generation_with_specialized_errors(self) -> None:
f"Actual error message does not match expexted for {source}"
)
@support.skip_if_new_parser("This tests nothing for now, since compile uses pegen as well")
@unittest.expectedFailure
def test_correct_but_known_to_fail_ast_generation_on_source_files(self) -> None:
for source in GOOD_BUT_FAIL_SOURCES:
actual_ast = peg_parser.parse_string(source)
expected_ast = ast.parse(source)
expected_ast = peg_parser.parse_string(source, oldparser=True)
self.assertEqual(
ast.dump(actual_ast, include_attributes=True),
ast.dump(expected_ast, include_attributes=True),
@ -736,7 +735,7 @@ def test_correct_but_known_to_fail_ast_generation_on_source_files(self) -> None:
def test_correct_ast_generation_without_pos_info(self) -> None:
for source in GOOD_BUT_FAIL_SOURCES:
actual_ast = peg_parser.parse_string(source)
expected_ast = ast.parse(source)
expected_ast = peg_parser.parse_string(source, oldparser=True)
self.assertEqual(
ast.dump(actual_ast),
ast.dump(expected_ast),
@ -752,7 +751,7 @@ def test_fstring_parse_error_tracebacks(self) -> None:
def test_correct_ast_generatrion_eval(self) -> None:
for source in EXPRESSIONS_TEST_SOURCES:
actual_ast = peg_parser.parse_string(source, mode='eval')
expected_ast = ast.parse(source, mode='eval')
expected_ast = peg_parser.parse_string(source, mode='eval', oldparser=True)
self.assertEqual(
ast.dump(actual_ast, include_attributes=True),
ast.dump(expected_ast, include_attributes=True),

14
Modules/_peg_parser.c
View file

@ -45,11 +45,13 @@ _Py_parse_file(PyObject *self, PyObject *args, PyObject *kwds)
PyObject *
_Py_parse_string(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *keywords[] = {"string", "mode", NULL};
static char *keywords[] = {"string", "mode", "oldparser", NULL};
char *the_string;
char *mode_str = "exec";
int oldparser = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|s", keywords, &the_string, &mode_str)) {
if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|sp", keywords,
&the_string, &mode_str, &oldparser)) {
return NULL;
}
@ -77,7 +79,13 @@ _Py_parse_string(PyObject *self, PyObject *args, PyObject *kwds)
PyCompilerFlags flags = _PyCompilerFlags_INIT;
flags.cf_flags = PyCF_IGNORE_COOKIE;
mod_ty res = PyPegen_ASTFromString(the_string, mode, &flags, arena);
mod_ty res;
if (oldparser) {
res = PyParser_ASTFromString(the_string, "<string>", mode, &flags, arena);
}
else {
res = PyPegen_ASTFromString(the_string, mode, &flags, arena);
}
if (res == NULL) {
goto error;
}