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bpo-35975: Support parsing earlier minor versions of Python 3 (GH-12086)

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This adds a `feature_version` flag to `ast.parse()` (documented) and `compile()` (hidden) that allow tweaking the parser to support older versions of the grammar. In particular if `feature_version` is 5 or 6, the hacks for the `async` and `await` keyword from PEP 492 are reinstated. (For 7 or higher, these are unconditionally treated as keywords, but they are still special tokens rather than `NAME` tokens that the parser driver recognizes.)



https://bugs.python.org/issue35975
This commit is contained in:
Guido van Rossum 2019-03-07 12:38:08 -08:00 • committed by Miss Islington (bot)
parent bf94cc7b49
commit 495da29225
29 changed files with 476 additions and 201 deletions
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15
Python/clinic/bltinmodule.c.h generated
View file

@ -151,7 +151,7 @@ exit:
PyDoc_STRVAR(builtin_compile__doc__,
"compile($module, /, source, filename, mode, flags=0,\n"
" dont_inherit=False, optimize=-1)\n"
" dont_inherit=False, optimize=-1, feature_version=-1)\n"
"--\n"
"\n"
"Compile source into a code object that can be executed by exec() or eval().\n"
@ -173,26 +173,27 @@ PyDoc_STRVAR(builtin_compile__doc__,
static PyObject *
builtin_compile_impl(PyObject *module, PyObject *source, PyObject *filename,
const char *mode, int flags, int dont_inherit,
int optimize);
int optimize, int feature_version);
static PyObject *
builtin_compile(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
{
PyObject *return_value = NULL;
static const char * const _keywords[] = {"source", "filename", "mode", "flags", "dont_inherit", "optimize", NULL};
static _PyArg_Parser _parser = {"OO&s|iii:compile", _keywords, 0};
static const char * const _keywords[] = {"source", "filename", "mode", "flags", "dont_inherit", "optimize", "feature_version", NULL};
static _PyArg_Parser _parser = {"OO&s|iiii:compile", _keywords, 0};
PyObject *source;
PyObject *filename;
const char *mode;
int flags = 0;
int dont_inherit = 0;
int optimize = -1;
int feature_version = -1;
if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
&source, PyUnicode_FSDecoder, &filename, &mode, &flags, &dont_inherit, &optimize)) {
&source, PyUnicode_FSDecoder, &filename, &mode, &flags, &dont_inherit, &optimize, &feature_version)) {
goto exit;
}
return_value = builtin_compile_impl(module, source, filename, mode, flags, dont_inherit, optimize);
return_value = builtin_compile_impl(module, source, filename, mode, flags, dont_inherit, optimize, feature_version);
exit:
return return_value;
@ -754,4 +755,4 @@ builtin_issubclass(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
exit:
return return_value;
}
/*[clinic end generated code: output=54e5e33dcc2659e0 input=a9049054013a1b77]*/
/*[clinic end generated code: output=00b97a48ea49eaf2 input=a9049054013a1b77]*/