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make YieldFrom its own distinct from Yield (closes #13780)

This commit is contained in:
Benjamin Peterson 2012-01-14 08:58:23 -05:00
parent 91f252b179
commit 527c622926
7 changed files with 91 additions and 39 deletions
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21
Include/Python-ast.h
View File

@ -180,10 +180,10 @@ struct _stmt {
enum _expr_kind {BoolOp_kind=1, BinOp_kind=2, UnaryOp_kind=3, Lambda_kind=4,
IfExp_kind=5, Dict_kind=6, Set_kind=7, ListComp_kind=8,
SetComp_kind=9, DictComp_kind=10, GeneratorExp_kind=11,
Yield_kind=12, Compare_kind=13, Call_kind=14, Num_kind=15,
Str_kind=16, Bytes_kind=17, Ellipsis_kind=18,
Attribute_kind=19, Subscript_kind=20, Starred_kind=21,
Name_kind=22, List_kind=23, Tuple_kind=24};
Yield_kind=12, YieldFrom_kind=13, Compare_kind=14,
Call_kind=15, Num_kind=16, Str_kind=17, Bytes_kind=18,
Ellipsis_kind=19, Attribute_kind=20, Subscript_kind=21,
Starred_kind=22, Name_kind=23, List_kind=24, Tuple_kind=25};
struct _expr {
enum _expr_kind kind;
union {
@ -245,10 +245,13 @@ struct _expr {
} GeneratorExp;
struct {
int is_from;
expr_ty value;
} Yield;
struct {
expr_ty value;
} YieldFrom;
struct {
expr_ty left;
asdl_int_seq *ops;
@ -488,9 +491,11 @@ expr_ty _Py_DictComp(expr_ty key, expr_ty value, asdl_seq * generators, int
#define GeneratorExp(a0, a1, a2, a3, a4) _Py_GeneratorExp(a0, a1, a2, a3, a4)
expr_ty _Py_GeneratorExp(expr_ty elt, asdl_seq * generators, int lineno, int
col_offset, PyArena *arena);
#define Yield(a0, a1, a2, a3, a4) _Py_Yield(a0, a1, a2, a3, a4)
expr_ty _Py_Yield(int is_from, expr_ty value, int lineno, int col_offset,
PyArena *arena);
#define Yield(a0, a1, a2, a3) _Py_Yield(a0, a1, a2, a3)
expr_ty _Py_Yield(expr_ty value, int lineno, int col_offset, PyArena *arena);
#define YieldFrom(a0, a1, a2, a3) _Py_YieldFrom(a0, a1, a2, a3)
expr_ty _Py_YieldFrom(expr_ty value, int lineno, int col_offset, PyArena
*arena);
#define Compare(a0, a1, a2, a3, a4, a5) _Py_Compare(a0, a1, a2, a3, a4, a5)
expr_ty _Py_Compare(expr_ty left, asdl_int_seq * ops, asdl_seq * comparators,
int lineno, int col_offset, PyArena *arena);

4
Lib/test/test_ast.py
View File

@ -813,8 +813,8 @@ class ASTValidatorTests(unittest.TestCase):
self._check_comprehension(factory)
def test_yield(self):
self.expr(ast.Yield(0, ast.Name("x", ast.Store())), "must have Load")
self.expr(ast.Yield(1, ast.Name("x", ast.Store())), "must have Load")
self.expr(ast.Yield(ast.Name("x", ast.Store())), "must have Load")
self.expr(ast.YieldFrom(ast.Name("x", ast.Store())), "must have Load")
def test_compare(self):
left = ast.Name("x", ast.Load())

3
Parser/Python.asdl
View File

@ -59,7 +59,8 @@ module Python
| DictComp(expr key, expr value, comprehension* generators)
| GeneratorExp(expr elt, comprehension* generators)
-- the grammar constrains where yield expressions can occur
| Yield(int is_from, expr? value)
| Yield(expr? value)
| YieldFrom(expr? value)
-- need sequences for compare to distinguish between
-- x < 4 < 3 and (x < 4) < 3
| Compare(expr left, cmpop* ops, expr* comparators)

76
Python/Python-ast.c
View File

@ -231,9 +231,11 @@ static char *GeneratorExp_fields[]={
"generators",
};
static PyTypeObject *Yield_type;
_Py_IDENTIFIER(is_from);
static char *Yield_fields[]={
"is_from",
"value",
};
static PyTypeObject *YieldFrom_type;
static char *YieldFrom_fields[]={
"value",
};
static PyTypeObject *Compare_type;
@ -812,8 +814,10 @@ static int init_types(void)
GeneratorExp_type = make_type("GeneratorExp", expr_type,
GeneratorExp_fields, 2);
if (!GeneratorExp_type) return 0;
Yield_type = make_type("Yield", expr_type, Yield_fields, 2);
Yield_type = make_type("Yield", expr_type, Yield_fields, 1);
if (!Yield_type) return 0;
YieldFrom_type = make_type("YieldFrom", expr_type, YieldFrom_fields, 1);
if (!YieldFrom_type) return 0;
Compare_type = make_type("Compare", expr_type, Compare_fields, 3);
if (!Compare_type) return 0;
Call_type = make_type("Call", expr_type, Call_fields, 5);
@ -1749,20 +1753,33 @@ GeneratorExp(expr_ty elt, asdl_seq * generators, int lineno, int col_offset,
}
expr_ty
Yield(int is_from, expr_ty value, int lineno, int col_offset, PyArena *arena)
Yield(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
expr_ty p;
p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
if (!p)
return NULL;
p->kind = Yield_kind;
p->v.Yield.is_from = is_from;
p->v.Yield.value = value;
p->lineno = lineno;
p->col_offset = col_offset;
return p;
}
expr_ty
YieldFrom(expr_ty value, int lineno, int col_offset, PyArena *arena)
{
expr_ty p;
p = (expr_ty)PyArena_Malloc(arena, sizeof(*p));
if (!p)
return NULL;
p->kind = YieldFrom_kind;
p->v.YieldFrom.value = value;
p->lineno = lineno;
p->col_offset = col_offset;
return p;
}
expr_ty
Compare(expr_ty left, asdl_int_seq * ops, asdl_seq * comparators, int lineno,
int col_offset, PyArena *arena)
@ -2798,12 +2815,16 @@ ast2obj_expr(void* _o)
case Yield_kind:
result = PyType_GenericNew(Yield_type, NULL, NULL);
if (!result) goto failed;
value = ast2obj_int(o->v.Yield.is_from);
value = ast2obj_expr(o->v.Yield.value);
if (!value) goto failed;
if (_PyObject_SetAttrId(result, &PyId_is_from, value) == -1)
if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
goto failed;
Py_DECREF(value);
value = ast2obj_expr(o->v.Yield.value);
break;
case YieldFrom_kind:
result = PyType_GenericNew(YieldFrom_type, NULL, NULL);
if (!result) goto failed;
value = ast2obj_expr(o->v.YieldFrom.value);
if (!value) goto failed;
if (_PyObject_SetAttrId(result, &PyId_value, value) == -1)
goto failed;
@ -5345,21 +5366,8 @@ obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena)
return 1;
}
if (isinstance) {
int is_from;
expr_ty value;
if (_PyObject_HasAttrId(obj, &PyId_is_from)) {
int res;
tmp = _PyObject_GetAttrId(obj, &PyId_is_from);
if (tmp == NULL) goto failed;
res = obj2ast_int(tmp, &is_from, arena);
if (res != 0) goto failed;
Py_XDECREF(tmp);
tmp = NULL;
} else {
PyErr_SetString(PyExc_TypeError, "required field \"is_from\" missing from Yield");
return 1;
}
if (_PyObject_HasAttrId(obj, &PyId_value)) {
int res;
tmp = _PyObject_GetAttrId(obj, &PyId_value);
@ -5371,7 +5379,29 @@ obj2ast_expr(PyObject* obj, expr_ty* out, PyArena* arena)
} else {
value = NULL;
}
*out = Yield(is_from, value, lineno, col_offset, arena);
*out = Yield(value, lineno, col_offset, arena);
if (*out == NULL) goto failed;
return 0;
}
isinstance = PyObject_IsInstance(obj, (PyObject*)YieldFrom_type);
if (isinstance == -1) {
return 1;
}
if (isinstance) {
expr_ty value;
if (_PyObject_HasAttrId(obj, &PyId_value)) {
int res;
tmp = _PyObject_GetAttrId(obj, &PyId_value);
if (tmp == NULL) goto failed;
res = obj2ast_expr(tmp, &value, arena);
if (res != 0) goto failed;
Py_XDECREF(tmp);
tmp = NULL;
} else {
value = NULL;
}
*out = YieldFrom(value, lineno, col_offset, arena);
if (*out == NULL) goto failed;
return 0;
}
@ -6928,6 +6958,8 @@ PyInit__ast(void)
(PyObject*)GeneratorExp_type) < 0) return NULL;
if (PyDict_SetItemString(d, "Yield", (PyObject*)Yield_type) < 0) return
NULL;
if (PyDict_SetItemString(d, "YieldFrom", (PyObject*)YieldFrom_type) <
0) return NULL;
if (PyDict_SetItemString(d, "Compare", (PyObject*)Compare_type) < 0)
return NULL;
if (PyDict_SetItemString(d, "Call", (PyObject*)Call_type) < 0) return

8
Python/ast.c
View File

@ -223,6 +223,9 @@ validate_expr(expr_ty exp, expr_context_ty ctx)
validate_expr(exp->v.DictComp.value, Load);
case Yield_kind:
return !exp->v.Yield.value || validate_expr(exp->v.Yield.value, Load);
case YieldFrom_kind:
return !exp->v.YieldFrom.value ||
validate_expr(exp->v.YieldFrom.value, Load);
case Compare_kind:
if (!asdl_seq_LEN(exp->v.Compare.comparators)) {
PyErr_SetString(PyExc_ValueError, "Compare with no comparators");
@ -942,6 +945,7 @@ set_context(struct compiling *c, expr_ty e, expr_context_ty ctx, const node *n)
expr_name = "generator expression";
break;
case Yield_kind:
case YieldFrom_kind:
expr_name = "yield expression";
break;
case ListComp_kind:
@ -2386,7 +2390,9 @@ ast_for_expr(struct compiling *c, const node *n)
if (!exp)
return NULL;
}
return Yield(is_from, exp, LINENO(n), n->n_col_offset, c->c_arena);
if (is_from)
return YieldFrom(exp, LINENO(n), n->n_col_offset, c->c_arena);
return Yield(exp, LINENO(n), n->n_col_offset, c->c_arena);
}
case factor:
if (NCH(n) == 1) {

10
Python/compile.c
View File

@ -3311,21 +3311,25 @@ compiler_visit_expr(struct compiler *c, expr_ty e)
case DictComp_kind:
return compiler_dictcomp(c, e);
case Yield_kind:
case YieldFrom_kind: {
expr_ty value;
if (c->u->u_ste->ste_type != FunctionBlock)
return compiler_error(c, "'yield' outside function");
if (e->v.Yield.value) {
VISIT(c, expr, e->v.Yield.value);
value = (e->kind == YieldFrom_kind) ? e->v.YieldFrom.value : e->v.Yield.value;
if (value) {
VISIT(c, expr, value);
}
else {
ADDOP_O(c, LOAD_CONST, Py_None, consts);
}
if (e->v.Yield.is_from) {
if (e->kind == YieldFrom_kind) {
ADDOP(c, YIELD_FROM);
}
else {
ADDOP(c, YIELD_VALUE);
}
break;
}
case Compare_kind:
return compiler_compare(c, e);
case Call_kind:

8
Python/symtable.c
View File

@ -1330,10 +1330,14 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
return 0;
break;
case Yield_kind:
if (e->v.Yield.value)
VISIT(st, expr, e->v.Yield.value);
case YieldFrom_kind: {
expr_ty value;
value = (e->kind == YieldFrom_kind) ? e->v.YieldFrom.value : e->v.Yield.value;
if (value)
VISIT(st, expr, value);
st->st_cur->ste_generator = 1;
break;
}
case Compare_kind:
VISIT(st, expr, e->v.Compare.left);
VISIT_SEQ(st, expr, e->v.Compare.comparators);