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from __future__ import with_statement addon for 'with', mostly written by

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Neal.
This commit is contained in:
Thomas Wouters 2006-02-28 19:02:24 +00:00
parent edc8f1366a
commit 34aa7ba114
16 changed files with 102 additions and 40 deletions
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6
Include/code.h
View File

@ -46,6 +46,12 @@ typedef struct {
#endif
#define CO_FUTURE_DIVISION 0x2000
#define CO_FUTURE_ABSIMPORT 0x4000 /* absolute import by default */
#define CO_FUTURE_WITH_STATEMENT 0x8000
/* This should be defined if a future statement modifies the syntax.
For example, when a keyword is added.
*/
#define PY_PARSER_REQUIRES_FUTURE_KEYWORD
#define CO_MAXBLOCKS 20 /* Max static block nesting within a function */

1
Include/compile.h
View File

@ -23,6 +23,7 @@ typedef struct {
#define FUTURE_GENERATORS "generators"
#define FUTURE_DIVISION "division"
#define FUTURE_ABSIMPORT "absolute_import"
#define FUTURE_WITH_STATEMENT "with_statement"
struct _mod; /* Declare the existence of this type */
PyAPI_FUNC(PyCodeObject *) PyAST_Compile(struct _mod *, const char *,

6
Include/modsupport.h
View File

@ -39,8 +39,8 @@ PyAPI_FUNC(int) PyModule_AddIntConstant(PyObject *, const char *, long);
PyAPI_FUNC(int) PyModule_AddStringConstant(PyObject *, const char *, const char *);
#define PYTHON_API_VERSION 1012
#define PYTHON_API_STRING "1012"
#define PYTHON_API_VERSION 1013
#define PYTHON_API_STRING "1013"
/* The API version is maintained (independently from the Python version)
so we can detect mismatches between the interpreter and dynamically
loaded modules. These are diagnosed by an error message but
@ -54,6 +54,8 @@ PyAPI_FUNC(int) PyModule_AddStringConstant(PyObject *, const char *, const char
Please add a line or two to the top of this log for each API
version change:
22-Feb-2006 GvR 1013 PEP 353 - long indices for sequence lengths
19-Aug-2002 GvR 1012 Changes to string object struct for
interning changes, saving 3 bytes.

2
Include/parsetok.h
View File

@ -23,6 +23,8 @@ typedef struct {
#define PyPARSE_DONT_IMPLY_DEDENT 0x0002
#define PyPARSE_WITH_IS_KEYWORD 0x0003
PyAPI_FUNC(node *) PyParser_ParseString(const char *, grammar *, int,
perrdetail *);
PyAPI_FUNC(node *) PyParser_ParseFile (FILE *, const char *, grammar *, int,

3
Include/pythonrun.h
View File

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

6
Lib/__future__.py
View File

@ -52,6 +52,7 @@ all_feature_names = [
"generators",
"division",
"absolute_import",
"with_statement",
]
__all__ = ["all_feature_names"] + all_feature_names
@ -64,6 +65,7 @@ CO_NESTED = 0x0010 # nested_scopes
CO_GENERATOR_ALLOWED = 0 # generators (obsolete, was 0x1000)
CO_FUTURE_DIVISION = 0x2000 # division
CO_FUTURE_ABSIMPORT = 0x4000 # absolute_import
CO_FUTURE_WITH_STATEMENT = 0x8000 # with statement added in 2.5
class _Feature:
def __init__(self, optionalRelease, mandatoryRelease, compiler_flag):
@ -108,3 +110,7 @@ division = _Feature((2, 2, 0, "alpha", 2),
absolute_import = _Feature((2, 5, 0, "alpha", 1),
(2, 7, 0, "alpha", 0),
CO_FUTURE_ABSIMPORT)
with_statement = _Feature((2, 5, 0, "alpha", 2),
(2, 6, 0, "alpha", 0),
CO_FUTURE_WITH_STATEMENT)

3
Lib/compiler/future.py
View File

@ -15,7 +15,8 @@ def is_future(stmt):
class FutureParser:
features = ("nested_scopes", "generators", "division")
features = ("nested_scopes", "generators", "division",
"absolute_import", "with_statement")
def __init__(self):
self.found = {} # set

2
Lib/test/test_with.py
View File

@ -2,6 +2,8 @@
"""Unit tests for the with statement specified in PEP 343."""
from __future__ import with_statement
__author__ = "Mike Bland"
__email__ = "mbland at acm dot org"

3
Misc/NEWS
View File

@ -32,7 +32,8 @@ Core and builtins
- dict.__getitem__ now looks for a __missing__ hook before raising
KeyError.
- PEP 343: with statement implemented.
- PEP 343: with statement implemented. Needs 'from __future__ import
with_statement'. Use of 'with' as a variable will generate a warning.
- Fix the encodings package codec search function to only search
inside its own package. Fixes problem reported in patch #1433198.

37
Parser/parser.c
View File

@ -79,8 +79,8 @@ PyParser_New(grammar *g, int start)
if (ps == NULL)
return NULL;
ps->p_grammar = g;
#if 0 /* future keyword */
ps->p_generators = 0;
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
ps->p_flags = 0;
#endif
ps->p_tree = PyNode_New(start);
if (ps->p_tree == NULL) {
@ -147,10 +147,10 @@ classify(parser_state *ps, int type, char *str)
if (l->lb_type == NAME && l->lb_str != NULL &&
l->lb_str[0] == s[0] &&
strcmp(l->lb_str, s) == 0) {
#if 0 /* future keyword */
if (!ps->p_generators &&
s[0] == 'y' &&
strcmp(s, "yield") == 0)
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (!(ps->p_flags & CO_FUTURE_WITH_STATEMENT) &&
s[0] == 'w' &&
strcmp(s, "with") == 0)
break; /* not a keyword */
#endif
D(printf("It's a keyword\n"));
@ -174,7 +174,7 @@ classify(parser_state *ps, int type, char *str)
return -1;
}
#if 0 /* future keyword */
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
static void
future_hack(parser_state *ps)
{
@ -182,16 +182,27 @@ future_hack(parser_state *ps)
node *ch;
int i;
if (strcmp(STR(CHILD(n, 0)), "from") != 0)
/* from __future__ import ..., must have at least 4 children */
n = CHILD(n, 0);
if (NCH(n) < 4)
return;
ch = CHILD(n, 0);
if (STR(ch) == NULL || strcmp(STR(ch), "from") != 0)
return;
ch = CHILD(n, 1);
if (strcmp(STR(CHILD(ch, 0)), "__future__") != 0)
if (NCH(ch) == 1 && STR(CHILD(ch, 0)) &&
strcmp(STR(CHILD(ch, 0)), "__future__") != 0)
return;
for (i = 3; i < NCH(n); i += 2) {
/* XXX: assume we don't have parentheses in import:
from __future__ import (x, y, z)
*/
ch = CHILD(n, i);
if (NCH(ch) == 1)
ch = CHILD(ch, 0);
if (NCH(ch) >= 1 && TYPE(CHILD(ch, 0)) == NAME &&
strcmp(STR(CHILD(ch, 0)), "generators") == 0) {
ps->p_generators = 1;
strcmp(STR(CHILD(ch, 0)), "with_statement") == 0) {
ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
break;
}
}
@ -255,7 +266,7 @@ PyParser_AddToken(register parser_state *ps, register int type, char *str,
"Direct pop.\n",
d->d_name,
ps->p_stack.s_top->s_state));
#if 0 /* future keyword */
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (d->d_name[0] == 'i' &&
strcmp(d->d_name,
"import_stmt") == 0)
@ -273,7 +284,7 @@ PyParser_AddToken(register parser_state *ps, register int type, char *str,
}
if (s->s_accept) {
#if 0 /* future keyword */
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (d->d_name[0] == 'i' &&
strcmp(d->d_name, "import_stmt") == 0)
future_hack(ps);

4
Parser/parser.h
View File

@ -25,8 +25,8 @@ typedef struct {
stack p_stack; /* Stack of parser states */
grammar *p_grammar; /* Grammar to use */
node *p_tree; /* Top of parse tree */
#if 0 /* future keyword */
int p_generators; /* 1 if yield is a keyword */
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
unsigned long p_flags; /* see co_flags in Include/code.h */
#endif
} parser_state;

55
Parser/parsetok.c
View File

@ -92,10 +92,19 @@ PyParser_ParseFileFlags(FILE *fp, const char *filename, grammar *g, int start,
/* Parse input coming from the given tokenizer structure.
Return error code. */
#if 0 /* future keyword */
static char yield_msg[] =
"%s:%d: Warning: 'yield' will become a reserved keyword in the future\n";
#endif
static char with_msg[] =
"%s:%d: Warning: 'with' will become a reserved keyword in Python 2.6\n";
static char as_msg[] =
"%s:%d: Warning: 'as' will become a reserved keyword in Python 2.6\n";
static void
warn(const char *msg, const char *filename, int lineno)
{
if (filename == NULL)
filename = "<string>";
PySys_WriteStderr(msg, filename, lineno);
}
static node *
parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
@ -103,7 +112,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
{
parser_state *ps;
node *n;
int started = 0;
int started = 0, handling_import = 0, handling_with = 0;
if ((ps = PyParser_New(g, start)) == NULL) {
fprintf(stderr, "no mem for new parser\n");
@ -111,9 +120,9 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
PyTokenizer_Free(tok);
return NULL;
}
#if 0 /* future keyword */
if (flags & PyPARSE_YIELD_IS_KEYWORD)
ps->p_generators = 1;
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
if (flags & PyPARSE_WITH_IS_KEYWORD)
ps->p_flags |= CO_FUTURE_WITH_STATEMENT;
#endif
for (;;) {
@ -129,6 +138,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
}
if (type == ENDMARKER && started) {
type = NEWLINE; /* Add an extra newline */
handling_with = handling_import = 0;
started = 0;
/* Add the right number of dedent tokens,
except if a certain flag is given --
@ -153,14 +163,27 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
strncpy(str, a, len);
str[len] = '\0';
#if 0 /* future keyword */
/* Warn about yield as NAME */
if (type == NAME && !ps->p_generators &&
len == 5 && str[0] == 'y' && strcmp(str, "yield") == 0)
PySys_WriteStderr(yield_msg,
err_ret->filename==NULL ?
"<string>" : err_ret->filename,
tok->lineno);
#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
/* This is only necessary to support the "as" warning, but
we don't want to warn about "as" in import statements. */
if (type == NAME &&
len == 6 && str[0] == 'i' && strcmp(str, "import") == 0)
handling_import = 1;
/* Warn about with as NAME */
if (type == NAME &&
!(ps->p_flags & CO_FUTURE_WITH_STATEMENT)) {
if (len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
warn(with_msg, err_ret->filename, tok->lineno);
else if (!(handling_import || handling_with) &&
len == 2 &&
str[0] == 'a' && strcmp(str, "as") == 0)
warn(as_msg, err_ret->filename, tok->lineno);
}
else if (type == NAME &&
(ps->p_flags & CO_FUTURE_WITH_STATEMENT) &&
len == 4 && str[0] == 'w' && strcmp(str, "with") == 0)
handling_with = 1;
#endif
if ((err_ret->error =

4
Python/Python-ast.c
View File

@ -371,7 +371,7 @@ static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int
}
PyTuple_SET_ITEM(fnames, i, field);
}
result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
type, base, "_fields", fnames, "__module__", "_ast");
Py_DECREF(fnames);
return (PyTypeObject*)result;
@ -2956,7 +2956,7 @@ init_ast(void)
if (PyDict_SetItemString(d, "AST", (PyObject*)AST_type) < 0) return;
if (PyModule_AddIntConstant(m, "PyCF_ONLY_AST", PyCF_ONLY_AST) < 0)
return;
if (PyModule_AddStringConstant(m, "__version__", "42635") < 0)
if (PyModule_AddStringConstant(m, "__version__", "42649") < 0)
return;
if(PyDict_SetItemString(d, "mod", (PyObject*)mod_type) < 0) return;
if(PyDict_SetItemString(d, "Module", (PyObject*)Module_type) < 0)

2
Python/compile.c
View File

@ -4286,6 +4286,8 @@ compute_code_flags(struct compiler *c)
flags |= CO_GENERATOR;
if (c->c_flags->cf_flags & CO_FUTURE_DIVISION)
flags |= CO_FUTURE_DIVISION;
if (c->c_flags->cf_flags & CO_FUTURE_WITH_STATEMENT)
flags |= CO_FUTURE_WITH_STATEMENT;
n = PyDict_Size(c->u->u_freevars);
if (n < 0)
return -1;

2
Python/future.c
View File

@ -31,6 +31,8 @@ future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
ff->ff_features |= CO_FUTURE_DIVISION;
} else if (strcmp(feature, FUTURE_ABSIMPORT) == 0) {
ff->ff_features |= CO_FUTURE_ABSIMPORT;
} else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
} else if (strcmp(feature, "braces") == 0) {
PyErr_SetString(PyExc_SyntaxError,
"not a chance");

6
Python/pythonrun.c
View File

@ -690,8 +690,10 @@ PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flag
/* compute parser flags based on compiler flags */
#define PARSER_FLAGS(flags) \
(((flags) && (flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \
PyPARSE_DONT_IMPLY_DEDENT : 0)
((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \
PyPARSE_DONT_IMPLY_DEDENT : 0) \
| ((flags)->cf_flags & CO_FUTURE_WITH_STATEMENT ? \
PyPARSE_WITH_IS_KEYWORD : 0)) : 0)
int
PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags)