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Patch #2477: Added from __future__ import unicode_literals 

The new PyParser_*Ex() functions are based on Neal's suggestion and initial patch. The new __future__ feature makes all '' and r'' unicode strings. b'' and br'' stay (byte) strings.
This commit is contained in:
Christian Heimes 2008-03-26 22:01:37 +00:00
parent 0cb3e86c47
commit 3c60833e1e
12 changed files with 107 additions and 33 deletions
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1
Include/code.h
View File

@ -49,6 +49,7 @@ typedef struct {
#define CO_FUTURE_ABSOLUTE_IMPORT 0x4000 /* do absolute imports by default */
#define CO_FUTURE_WITH_STATEMENT 0x8000
#define CO_FUTURE_PRINT_FUNCTION 0x10000
#define CO_FUTURE_UNICODE_LITERALS 0x20000
/* This should be defined if a future statement modifies the syntax.
For example, when a keyword is added.

1
Include/compile.h
View File

@ -25,6 +25,7 @@ typedef struct {
#define FUTURE_ABSOLUTE_IMPORT "absolute_import"
#define FUTURE_WITH_STATEMENT "with_statement"
#define FUTURE_PRINT_FUNCTION "print_function"
#define FUTURE_UNICODE_LITERALS "unicode_literals"
struct _mod; /* Declare the existence of this type */

8
Include/parsetok.h
View File

@ -28,6 +28,7 @@ typedef struct {
#endif
#define PyPARSE_PRINT_IS_FUNCTION 0x0004
#define PyPARSE_UNICODE_LITERALS 0x0008
@ -41,11 +42,18 @@ PyAPI_FUNC(node *) PyParser_ParseStringFlags(const char *, grammar *, int,
PyAPI_FUNC(node *) PyParser_ParseFileFlags(FILE *, const char *, grammar *,
int, char *, char *,
perrdetail *, int);
PyAPI_FUNC(node *) PyParser_ParseFileFlagsEx(FILE *, const char *, grammar *,
int, char *, char *,
perrdetail *, int *);
PyAPI_FUNC(node *) PyParser_ParseStringFlagsFilename(const char *,
const char *,
grammar *, int,
perrdetail *, int);
PyAPI_FUNC(node *) PyParser_ParseStringFlagsFilenameEx(const char *,
const char *,
grammar *, int,
perrdetail *, int *);
/* Note that he following function is defined in pythonrun.c not parsetok.c. */
PyAPI_FUNC(void) PyParser_SetError(perrdetail *);

3
Include/pythonrun.h
View File

@ -8,7 +8,8 @@ extern "C" {
#endif
#define PyCF_MASK (CO_FUTURE_DIVISION | CO_FUTURE_ABSOLUTE_IMPORT | \
CO_FUTURE_WITH_STATEMENT|CO_FUTURE_PRINT_FUNCTION)
CO_FUTURE_WITH_STATEMENT | CO_FUTURE_PRINT_FUNCTION | \
CO_FUTURE_UNICODE_LITERALS)
#define PyCF_MASK_OBSOLETE (CO_NESTED)
#define PyCF_SOURCE_IS_UTF8 0x0100
#define PyCF_DONT_IMPLY_DEDENT 0x0200

6
Lib/__future__.py
View File

@ -54,6 +54,7 @@ all_feature_names = [
"absolute_import",
"with_statement",
"print_function",
"unicode_literals",
]
__all__ = ["all_feature_names"] + all_feature_names
@ -68,6 +69,7 @@ CO_FUTURE_DIVISION = 0x2000 # division
CO_FUTURE_ABSOLUTE_IMPORT = 0x4000 # perform absolute imports by default
CO_FUTURE_WITH_STATEMENT = 0x8000 # with statement
CO_FUTURE_PRINT_FUNCTION = 0x10000 # print function
CO_FUTURE_UNICODE_LITERALS = 0x20000 # unicode string literals
class _Feature:
def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
@ -120,3 +122,7 @@ with_statement = _Feature((2, 5, 0, "alpha", 1),
print_function = _Feature((2, 6, 0, "alpha", 2),
(3, 0, 0, "alpha", 0),
CO_FUTURE_PRINT_FUNCTION)
unicode_literals = _Feature((2, 6, 0, "alpha", 2),
(3, 0, 0, "alpha", 0),
CO_FUTURE_UNICODE_LITERALS)

8
Misc/NEWS
View File

@ -12,6 +12,8 @@ What's New in Python 2.6 alpha 2?
Core and builtins
-----------------
- Patch #2477: Added from __future__ import unicode_literals
- Added backport of bytearray type.
- Issue #2355: add Py3k warning for buffer().
@ -186,6 +188,12 @@ Build
- Patch #2284: Add -x64 option to rt.bat.
C API
-----
- Patch #2477: Added PyParser_ParseFileFlagsEx() and
PyParser_ParseStringFlagsFilenameEx()
What's New in Python 2.6 alpha 1?
=================================

20
Parser/parser.c
View File

@ -202,14 +202,18 @@ future_hack(parser_state *ps)
for (i = 0; i < NCH(ch); i += 2) {
cch = CHILD(ch, i);
if (NCH(cch) >= 1 && TYPE(CHILD(cch, 0)) == NAME &&
strcmp(STR(CHILD(cch, 0)), "with_statement") == 0) {
ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
break;
} else if (NCH(cch) >= 1 && TYPE(CHILD(cch, 0)) == NAME &&
strcmp(STR(CHILD(cch, 0)), "print_function") == 0) {
ps->p_flags |= CO_FUTURE_PRINT_FUNCTION;
break;
if (NCH(cch) >= 1 && TYPE(CHILD(cch, 0)) == NAME) {
char *str_ch = STR(CHILD(cch, 0));
if (strcmp(str_ch, FUTURE_WITH_STATEMENT) == 0) {
ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
break;
} else if (strcmp(str_ch, FUTURE_PRINT_FUNCTION) == 0) {
ps->p_flags |= CO_FUTURE_PRINT_FUNCTION;
break;
} else if (strcmp(str_ch, FUTURE_UNICODE_LITERALS) == 0) {
ps->p_flags |= CO_FUTURE_UNICODE_LITERALS;
break;
}
}
}
}

33
Parser/parsetok.c
View File

@ -14,7 +14,7 @@ int Py_TabcheckFlag;
/* Forward */
static node *parsetok(struct tok_state *, grammar *, int, perrdetail *, int);
static node *parsetok(struct tok_state *, grammar *, int, perrdetail *, int *);
static void initerr(perrdetail *err_ret, const char* filename);
/* Parse input coming from a string. Return error code, print some errors. */
@ -36,6 +36,16 @@ node *
PyParser_ParseStringFlagsFilename(const char *s, const char *filename,
grammar *g, int start,
perrdetail *err_ret, int flags)
{
int iflags = flags;
return PyParser_ParseStringFlagsFilenameEx(s, filename, g, start,
err_ret, &iflags);
}
node *
PyParser_ParseStringFlagsFilenameEx(const char *s, const char *filename,
grammar *g, int start,
perrdetail *err_ret, int *flags)
{
struct tok_state *tok;
@ -69,6 +79,14 @@ PyParser_ParseFile(FILE *fp, const char *filename, grammar *g, int start,
node *
PyParser_ParseFileFlags(FILE *fp, const char *filename, grammar *g, int start,
char *ps1, char *ps2, perrdetail *err_ret, int flags)
{
int iflags = flags;
return PyParser_ParseFileFlagsEx(fp, filename, g, start, ps1, ps2, err_ret, &iflags);
}
node *
PyParser_ParseFileFlagsEx(FILE *fp, const char *filename, grammar *g, int start,
char *ps1, char *ps2, perrdetail *err_ret, int *flags)
{
struct tok_state *tok;
@ -85,7 +103,6 @@ PyParser_ParseFileFlags(FILE *fp, const char *filename, grammar *g, int start,
tok->alterror++;
}
return parsetok(tok, g, start, err_ret, flags);
}
@ -110,7 +127,7 @@ warn(const char *msg, const char *filename, int lineno)
static node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
int flags)
int *flags)
{
parser_state *ps;
node *n;
@ -123,8 +140,13 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
return NULL;
}
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (flags & PyPARSE_PRINT_IS_FUNCTION)
if (*flags & PyPARSE_PRINT_IS_FUNCTION) {
ps->p_flags |= CO_FUTURE_PRINT_FUNCTION;
}
if (*flags & PyPARSE_UNICODE_LITERALS) {
ps->p_flags |= CO_FUTURE_UNICODE_LITERALS;
}
#endif
for (;;) {
@ -147,7 +169,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
except if a certain flag is given --
codeop.py uses this. */
if (tok->indent &&
!(flags & PyPARSE_DONT_IMPLY_DEDENT))
!(*flags & PyPARSE_DONT_IMPLY_DEDENT))
{
tok->pendin = -tok->indent;
tok->indent = 0;
@ -191,6 +213,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
else
n = NULL;
*flags = ps->p_flags;
PyParser_Delete(ps);
if (n == NULL) {

25
Python/ast.c
View File

@ -18,6 +18,7 @@
/* Data structure used internally */
struct compiling {
char *c_encoding; /* source encoding */
int c_future_unicode; /* __future__ unicode literals flag */
PyArena *c_arena; /* arena for allocating memeory */
const char *c_filename; /* filename */
};
@ -36,7 +37,7 @@ static expr_ty ast_for_testlist_gexp(struct compiling *, const node *);
static expr_ty ast_for_call(struct compiling *, const node *, expr_ty);
static PyObject *parsenumber(const char *);
static PyObject *parsestr(const char *s, const char *encoding);
static PyObject *parsestr(struct compiling *, const char *);
static PyObject *parsestrplus(struct compiling *, const node *n);
#ifndef LINENO
@ -198,6 +199,7 @@ PyAST_FromNode(const node *n, PyCompilerFlags *flags, const char *filename,
} else {
c.c_encoding = NULL;
}
c.c_future_unicode = flags && flags->cf_flags & CO_FUTURE_UNICODE_LITERALS;
c.c_arena = arena;
c.c_filename = filename;
@ -3247,13 +3249,13 @@ decode_unicode(const char *s, size_t len, int rawmode, const char *encoding)
* parsestr parses it, and returns the decoded Python string object.
*/
static PyObject *
parsestr(const char *s, const char *encoding)
parsestr(struct compiling *c, const char *s)
{
size_t len;
int quote = Py_CHARMASK(*s);
int rawmode = 0;
int need_encoding;
int unicode = 0;
int unicode = c->c_future_unicode;
if (isalpha(quote) || quote == '_') {
if (quote == 'u' || quote == 'U') {
@ -3262,6 +3264,7 @@ parsestr(const char *s, const char *encoding)
}
if (quote == 'b' || quote == 'B') {
quote = *++s;
unicode = 0;
}
if (quote == 'r' || quote == 'R') {
quote = *++s;
@ -3293,12 +3296,12 @@ parsestr(const char *s, const char *encoding)
}
#ifdef Py_USING_UNICODE
if (unicode || Py_UnicodeFlag) {
return decode_unicode(s, len, rawmode, encoding);
return decode_unicode(s, len, rawmode, c->c_encoding);
}
#endif
need_encoding = (encoding != NULL &&
strcmp(encoding, "utf-8") != 0 &&
strcmp(encoding, "iso-8859-1") != 0);
need_encoding = (c->c_encoding != NULL &&
strcmp(c->c_encoding, "utf-8") != 0 &&
strcmp(c->c_encoding, "iso-8859-1") != 0);
if (rawmode || strchr(s, '\\') == NULL) {
if (need_encoding) {
#ifndef Py_USING_UNICODE
@ -3310,7 +3313,7 @@ parsestr(const char *s, const char *encoding)
PyObject *v, *u = PyUnicode_DecodeUTF8(s, len, NULL);
if (u == NULL)
return NULL;
v = PyUnicode_AsEncodedString(u, encoding, NULL);
v = PyUnicode_AsEncodedString(u, c->c_encoding, NULL);
Py_DECREF(u);
return v;
#endif
@ -3320,7 +3323,7 @@ parsestr(const char *s, const char *encoding)
}
return PyString_DecodeEscape(s, len, NULL, unicode,
need_encoding ? encoding : NULL);
need_encoding ? c->c_encoding : NULL);
}
/* Build a Python string object out of a STRING atom. This takes care of
@ -3333,11 +3336,11 @@ parsestrplus(struct compiling *c, const node *n)
PyObject *v;
int i;
REQ(CHILD(n, 0), STRING);
if ((v = parsestr(STR(CHILD(n, 0)), c->c_encoding)) != NULL) {
if ((v = parsestr(c, STR(CHILD(n, 0)))) != NULL) {
/* String literal concatenation */
for (i = 1; i < NCH(n); i++) {
PyObject *s;
s = parsestr(STR(CHILD(n, i)), c->c_encoding);
s = parsestr(c, STR(CHILD(n, i)));
if (s == NULL)
goto onError;
if (PyString_Check(v) && PyString_Check(s)) {

2
Python/future.c
View File

@ -35,6 +35,8 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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");

3
Python/import.c
View File

@ -818,11 +818,12 @@ parse_source_module(const char *pathname, FILE *fp)
{
PyCodeObject *co = NULL;
mod_ty mod;
PyCompilerFlags flags;
PyArena *arena = PyArena_New();
if (arena == NULL)
return NULL;
mod = PyParser_ASTFromFile(fp, pathname, Py_file_input, 0, 0, 0,
mod = PyParser_ASTFromFile(fp, pathname, Py_file_input, 0, 0, &flags,
NULL, arena);
if (mod) {
co = PyAST_Compile(mod, pathname, NULL, arena);

30
Python/pythonrun.c
View File

@ -774,8 +774,11 @@ PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flag
#define PARSER_FLAGS(flags) \
((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \
PyPARSE_DONT_IMPLY_DEDENT : 0) \
| ((flags)->cf_flags & CO_FUTURE_PRINT_FUNCTION ? \
PyPARSE_PRINT_IS_FUNCTION : 0)) : 0)
| (((flags)->cf_flags & CO_FUTURE_PRINT_FUNCTION) ? \
PyPARSE_PRINT_IS_FUNCTION : 0) \
| (((flags)->cf_flags & CO_FUTURE_UNICODE_LITERALS) ? \
PyPARSE_UNICODE_LITERALS : 0) \
) : 0)
#endif
int
@ -1390,11 +1393,12 @@ Py_SymtableString(const char *str, const char *filename, int start)
{
struct symtable *st;
mod_ty mod;
PyCompilerFlags flags;
PyArena *arena = PyArena_New();
if (arena == NULL)
return NULL;
mod = PyParser_ASTFromString(str, filename, start, NULL, arena);
mod = PyParser_ASTFromString(str, filename, start, &flags, arena);
if (mod == NULL) {
PyArena_Free(arena);
return NULL;
@ -1411,10 +1415,16 @@ PyParser_ASTFromString(const char *s, const char *filename, int start,
{
mod_ty mod;
perrdetail err;
node *n = PyParser_ParseStringFlagsFilename(s, filename,
int iflags;
iflags = PARSER_FLAGS(flags);
node *n = PyParser_ParseStringFlagsFilenameEx(s, filename,
&_PyParser_Grammar, start, &err,
PARSER_FLAGS(flags));
&iflags);
if (n) {
if (flags) {
flags->cf_flags |= iflags & PyCF_MASK;
}
mod = PyAST_FromNode(n, flags, filename, arena);
PyNode_Free(n);
return mod;
@ -1432,9 +1442,15 @@ PyParser_ASTFromFile(FILE *fp, const char *filename, int start, char *ps1,
{
mod_ty mod;
perrdetail err;
node *n = PyParser_ParseFileFlags(fp, filename, &_PyParser_Grammar,
start, ps1, ps2, &err, PARSER_FLAGS(flags));
int iflags;
iflags = PARSER_FLAGS(flags);
node *n = PyParser_ParseFileFlagsEx(fp, filename, &_PyParser_Grammar,
start, ps1, ps2, &err, &iflags);
if (n) {
if (flags) {
flags->cf_flags |= iflags & PyCF_MASK;
}
mod = PyAST_FromNode(n, flags, filename, arena);
PyNode_Free(n);
return mod;