Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-10-31 13:41:24 +00:00
Code Issues Projects Releases Packages Wiki Activity

String annotations [PEP 563] (#4390)

Browse source 
* Document `from __future__ import annotations`
* Provide plumbing and tests for `from __future__ import annotations`
* Implement unparsing the AST back to string form

This is required for PEP 563 and as such only implements a part of the
unparsing process that covers expressions.
This commit is contained in:
Guido van Rossum 2018-01-26 08:20:18 -08:00 • committed by Łukasz Langa
parent d7773d92bd
commit 95e4d58913
16 changed files with 1476 additions and 29 deletions
Download patch file Download diff file Expand all files Collapse all files

1163
Python/ast_unparse.c Normal file
View file

File diff suppressed because it is too large Load diff

26
Python/compile.c
View file

@ -1699,13 +1699,30 @@ compiler_visit_kwonlydefaults(struct compiler *c, asdl_seq *kwonlyargs,
return 0;
}
static int
compiler_visit_annexpr(struct compiler *c, expr_ty annotation)
{
PyObject *ann_as_str;
ann_as_str = _PyAST_ExprAsUnicode(annotation, 1);
if (!ann_as_str) {
return 0;
}
ADDOP_N(c, LOAD_CONST, ann_as_str, consts);
return 1;
}
static int
compiler_visit_argannotation(struct compiler *c, identifier id,
expr_ty annotation, PyObject *names)
{
if (annotation) {
PyObject *mangled;
VISIT(c, expr, annotation);
if (c->c_future->ff_features & CO_FUTURE_ANNOTATIONS) {
VISIT(c, annexpr, annotation)
}
else {
VISIT(c, expr, annotation);
}
mangled = _Py_Mangle(c->u->u_private, id);
if (!mangled)
return 0;
@ -4688,7 +4705,12 @@ compiler_annassign(struct compiler *c, stmt_ty s)
if (!mangled) {
return 0;
}
VISIT(c, expr, s->v.AnnAssign.annotation);
if (c->c_future->ff_features & CO_FUTURE_ANNOTATIONS) {
VISIT(c, annexpr, s->v.AnnAssign.annotation)
}
else {
VISIT(c, expr, s->v.AnnAssign.annotation);
}
/* ADDOP_N decrefs its argument */
ADDOP_N(c, STORE_ANNOTATION, mangled, names);
}

2
Python/future.c
View file

@ -42,6 +42,8 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename)
ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
} else if (strcmp(feature, FUTURE_GENERATOR_STOP) == 0) {
ff->ff_features |= CO_FUTURE_GENERATOR_STOP;
} else if (strcmp(feature, FUTURE_ANNOTATIONS) == 0) {
ff->ff_features |= CO_FUTURE_ANNOTATIONS;
} else if (strcmp(feature, "braces") == 0) {
PyErr_SetString(PyExc_SyntaxError,
"not a chance");