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#include
"Python.h"
#include
"Python-ast.h"
#include
"node.h"
#include
"token.h"
#include
"graminit.h"
#include
"code.h"
#include
"compile.h"
#include
"symtable.h"
#define
UNDEFINED_FUTURE_FEATURE
"future feature %.100s is not defined"
#define
ERR_LATE_FUTURE
\
"from __future__ imports must occur at the beginning of the file"
static
int
future_check_features
(
PyFutureFeatures
*
ff
,
stmt_ty
s
,
const
char
*
filename
)
{
int
i
;
asdl_seq
*
names
;
assert
(
s
->
kind
==
ImportFrom_kind
);
names
=
s
->
v
.
ImportFrom
.
names
;
for
(
i
=
0
;
i
<
asdl_seq_LEN
(
names
);
i
++
) {
alias_ty
name
=
(
alias_ty
)
asdl_seq_GET
(
names
,
i
);
const
char
*
feature
=
PyString_AsString
(
name
->
name
);
if
(!
feature
)
return
0
;
if
(
strcmp
(
feature
,
FUTURE_NESTED_SCOPES
)
==
0
) {
continue
;
}
else
if
(
strcmp
(
feature
,
FUTURE_GENERATORS
)
==
0
) {
continue
;
}
else
if
(
strcmp
(
feature
,
FUTURE_DIVISION
)
==
0
) {
ff
->
ff_features
|=
CO_FUTURE_DIVISION
;
}
else
if
(
strcmp
(
feature
,
FUTURE_ABSOLUTE_IMPORT
)
==
0
) {
ff
->
ff_features
|=
CO_FUTURE_ABSOLUTE_IMPORT
;
}
else
if
(
strcmp
(
feature
,
FUTURE_WITH_STATEMENT
)
==
0
) {
ff
->
ff_features
|=
CO_FUTURE_WITH_STATEMENT
;
}
else
if
(
strcmp
(
feature
,
FUTURE_PRINT_FUNCTION
)
==
0
) {
ff
->
ff_features
|=
CO_FUTURE_PRINT_FUNCTION
;
}
else
if
(
strcmp
(
feature
,
FUTURE_UNICODE_LITERALS
)
==
0
) {
ff
->
ff_features
|=
CO_FUTURE_UNICODE_LITERALS
;
}
else
if
(
strcmp
(
feature
,
"braces"
)
==
0
) {
PyErr_SetString
(
PyExc_SyntaxError
,
"not a chance"
);
PyErr_SyntaxLocation
(
filename
,
s
->
lineno
);
return
0
;
}
else
{
PyErr_Format
(
PyExc_SyntaxError
,
UNDEFINED_FUTURE_FEATURE
,
feature
);
PyErr_SyntaxLocation
(
filename
,
s
->
lineno
);
return
0
;
}
}
return
1
;
}
static
int
future_parse
(
PyFutureFeatures
*
ff
,
mod_ty
mod
,
const
char
*
filename
)
{
int
i
,
found_docstring
=
0
,
done
=
0
,
prev_line
=
0
;
static
PyObject
*
future
;
if
(!
future
) {
future
=
PyString_InternFromString
(
"__future__"
);
if
(!
future
)
return
0
;
}
if
(!(
mod
->
kind
==
Module_kind
||
mod
->
kind
==
Interactive_kind
))
return
1
;
/* A subsequent pass will detect future imports that don't
appear at the beginning of the file. There's one case,
however, that is easier to handle here: A series of imports
joined by semi-colons, where the first import is a future
statement but some subsequent import has the future form
but is preceded by a regular import.
*/
for
(
i
=
0
;
i
<
asdl_seq_LEN
(
mod
->
v
.
Module
.
body
);
i
++
) {
stmt_ty
s
=
(
stmt_ty
)
asdl_seq_GET
(
mod
->
v
.
Module
.
body
,
i
);
if
(
done
&&
s
->
lineno
>
prev_line
)
return
1
;
prev_line
=
s
->
lineno
;
/* The tests below will return from this function unless it is
still possible to find a future statement. The only things
that can precede a future statement are another future
statement and a doc string.
*/
if
(
s
->
kind
==
ImportFrom_kind
) {
if
(
s
->
v
.
ImportFrom
.
module
==
future
) {
if
(
done
) {
PyErr_SetString
(
PyExc_SyntaxError
,
ERR_LATE_FUTURE
);
PyErr_SyntaxLocation
(
filename
,
s
->
lineno
);
return
0
;
}
if
(!
future_check_features
(
ff
,
s
,
filename
))
return
0
;
ff
->
ff_lineno
=
s
->
lineno
;
}
else
done
=
1
;
}
else
if
(
s
->
kind
==
Expr_kind
&&
!
found_docstring
) {
expr_ty
e
=
s
->
v
.
Expr
.
value
;
if
(
e
->
kind
!=
Str_kind
)
done
=
1
;
else
found_docstring
=
1
;
}
else
done
=
1
;
}
return
1
;
}
PyFutureFeatures
*
PyFuture_FromAST
(
mod_ty
mod
,
const
char
*
filename
)
{
PyFutureFeatures
*
ff
;
ff
=
(
PyFutureFeatures
*
)
PyObject_Malloc
(
sizeof
(
PyFutureFeatures
));
if
(
ff
==
NULL
) {
PyErr_NoMemory
();
return
NULL
;
}
ff
->
ff_features
=
0
;
ff
->
ff_lineno
=
-1
;
if
(!
future_parse
(
ff
,
mod
,
filename
)) {
PyObject_Free
(
ff
);
return
NULL
;
}
return
ff
;
}
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