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PEP 343 -- the with-statement.

Browse source 
This was started by Mike Bland and completed by Guido
(with help from Neal).

This still needs a __future__ statement added;
Thomas is working on Michael's patch for that aspect.

There's a small amount of code cleanup and refactoring
in ast.c, compile.c and ceval.c (I fixed the lltrace
behavior when EXT_POP is used -- however I had to make
lltrace a static global).
This commit is contained in:
Guido van Rossum 2006-02-27 22:32:47 +00:00
parent 5fec904f84
commit c2e20744b2
23 changed files with 1853 additions and 816 deletions
Download patch file Download diff file Expand all files Collapse all files

52
Python/Python-ast.c
View file

@ -84,6 +84,12 @@ char *If_fields[]={
"body",
"orelse",
};
PyTypeObject *With_type;
char *With_fields[]={
"context_expr",
"optional_vars",
"body",
};
PyTypeObject *Raise_type;
char *Raise_fields[]={
"type",
@ -465,6 +471,8 @@ static int init_types(void)
if (!While_type) return 0;
If_type = make_type("If", stmt_type, If_fields, 3);
if (!If_type) return 0;
With_type = make_type("With", stmt_type, With_fields, 3);
if (!With_type) return 0;
Raise_type = make_type("Raise", stmt_type, Raise_fields, 3);
if (!Raise_type) return 0;
TryExcept_type = make_type("TryExcept", stmt_type, TryExcept_fields, 3);
@ -999,6 +1007,29 @@ If(expr_ty test, asdl_seq * body, asdl_seq * orelse, int lineno, PyArena *arena)
return p;
}
stmt_ty
With(expr_ty context_expr, expr_ty optional_vars, asdl_seq * body, int lineno,
PyArena *arena)
{
stmt_ty p;
if (!context_expr) {
PyErr_SetString(PyExc_ValueError,
"field context_expr is required for With");
return NULL;
}
p = (stmt_ty)PyArena_Malloc(arena, sizeof(*p));
if (!p) {
PyErr_NoMemory();
return NULL;
}
p->kind = With_kind;
p->v.With.context_expr = context_expr;
p->v.With.optional_vars = optional_vars;
p->v.With.body = body;
p->lineno = lineno;
return p;
}
stmt_ty
Raise(expr_ty type, expr_ty inst, expr_ty tback, int lineno, PyArena *arena)
{
@ -2062,6 +2093,26 @@ ast2obj_stmt(void* _o)
goto failed;
Py_DECREF(value);
break;
case With_kind:
result = PyType_GenericNew(With_type, NULL, NULL);
if (!result) goto failed;
value = ast2obj_expr(o->v.With.context_expr);
if (!value) goto failed;
if (PyObject_SetAttrString(result, "context_expr", value) == -1)
goto failed;
Py_DECREF(value);
value = ast2obj_expr(o->v.With.optional_vars);
if (!value) goto failed;
if (PyObject_SetAttrString(result, "optional_vars", value) ==
-1)
goto failed;
Py_DECREF(value);
value = ast2obj_list(o->v.With.body, ast2obj_stmt);
if (!value) goto failed;
if (PyObject_SetAttrString(result, "body", value) == -1)
goto failed;
Py_DECREF(value);
break;
case Raise_kind:
result = PyType_GenericNew(Raise_type, NULL, NULL);
if (!result) goto failed;
@ -2922,6 +2973,7 @@ init_ast(void)
if(PyDict_SetItemString(d, "For", (PyObject*)For_type) < 0) return;
if(PyDict_SetItemString(d, "While", (PyObject*)While_type) < 0) return;
if(PyDict_SetItemString(d, "If", (PyObject*)If_type) < 0) return;
if(PyDict_SetItemString(d, "With", (PyObject*)With_type) < 0) return;
if(PyDict_SetItemString(d, "Raise", (PyObject*)Raise_type) < 0) return;
if(PyDict_SetItemString(d, "TryExcept", (PyObject*)TryExcept_type) < 0)
return;