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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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5
Modules/parsermodule.c
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@ -341,6 +341,7 @@ parser_newstobject(node *st, int type)
o->st_node = st;
o->st_type = type;
o->st_flags.cf_flags = 0;
o->st_flags.cf_feature_version = PY_MINOR_VERSION;
}
else {
PyNode_Free(st);
@ -584,8 +585,10 @@ parser_do_parse(PyObject *args, PyObject *kw, const char *argspec, int type)
if (n) {
res = parser_newstobject(n, type);
if (res)
if (res) {
((PyST_Object *)res)->st_flags.cf_flags = flags & PyCF_MASK;
((PyST_Object *)res)->st_flags.cf_feature_version = PY_MINOR_VERSION;
}
}
else {
PyParser_SetError(&err);