cpython-lru_cache-weakref: Python/future.c annotate

annotate Python/future.c @ 35298:b2fe5f8fcfdd legacy-trunk

PEP 342 implementation. Per Guido's comments, the generator throw() method still needs to support string exceptions, and allow None for the third argument. Documentation updates are needed, too.

author	Phillip J. Eby <pje@telecommunity.com>
date	Tue, 02 Aug 2005 00:46:46 +0000
parents	8259ff3ee493
children	1c4d192f1568

rev	line source
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	1 #include "Python.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	2 #include "node.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	3 #include "token.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	4 #include "graminit.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	5 #include "compile.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	6 #include "symtable.h"
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	7
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	8 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	9 #define FUTURE_IMPORT_STAR "future statement does not support import *"
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	10
19407 81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	11 /* FUTURE_POSSIBLE() is provided to accomodate doc strings, which is
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	12 the only statement that can occur before a future statement.
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	13 */
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	14 #define FUTURE_POSSIBLE(FF) ((FF)->ff_last_lineno == -1)
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	15
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	16 static int
26601 cc05c2c8660e Constify filenames and scripts. Fixes #651362. Martin v. Löwis <martin@v.loewis.de> parents: 22968 diff changeset	17 future_check_features(PyFutureFeatures ff, node n, const char *filename)
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	18 {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	19 int i;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	20 char *feature;
33353 f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	21 node ch, nn;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	22
33353 f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	23 REQ(n, import_from);
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	24 nn = CHILD(n, 3 + (TYPE(CHILD(n, 3)) == LPAR));
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	25 if (TYPE(nn) == STAR) {
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	26 PyErr_SetString(PyExc_SyntaxError, FUTURE_IMPORT_STAR);
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	27 PyErr_SyntaxLocation(filename, nn->n_lineno);
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	28 return -1;
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	29 }
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	30 REQ(nn, import_as_names);
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	31 for (i = 0; i < NCH(nn); i += 2) {
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	32 ch = CHILD(nn, i);
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	33 REQ(ch, import_as_name);
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	34 feature = STR(CHILD(ch, 0));
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	35 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
19158 97a3d3d7029f Refactor future feature handling Jeremy Hylton <jeremy@alum.mit.edu> parents: 19051 diff changeset	36 continue;
18609 59446d0f8341 Preliminary support for "from __future__ import generators" to enable Guido van Rossum <guido@python.org> parents: 17018 diff changeset	37 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
22968 ba0236f84318 Removed more hair in support of future-generator stmts. Tim Peters <tim.peters@gmail.com> parents: 19407 diff changeset	38 continue;
19051 f20727cc3d0f Implement PEP 238 in its (almost) full glory. Guido van Rossum <guido@python.org> parents: 18612 diff changeset	39 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
19158 97a3d3d7029f Refactor future feature handling Jeremy Hylton <jeremy@alum.mit.edu> parents: 19051 diff changeset	40 ff->ff_features \|= CO_FUTURE_DIVISION;
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	41 } else if (strcmp(feature, "braces") == 0) {
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	42 PyErr_SetString(PyExc_SyntaxError,
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	43 "not a chance");
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	44 PyErr_SyntaxLocation(filename, CHILD(ch, 0)->n_lineno);
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	45 return -1;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	46 } else {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	47 PyErr_Format(PyExc_SyntaxError,
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	48 UNDEFINED_FUTURE_FEATURE, feature);
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	49 PyErr_SyntaxLocation(filename, CHILD(ch, 0)->n_lineno);
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	50 return -1;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	51 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	52 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	53 return 0;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	54 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	55
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	56 static void
26601 cc05c2c8660e Constify filenames and scripts. Fixes #651362. Martin v. Löwis <martin@v.loewis.de> parents: 22968 diff changeset	57 future_error(node n, const char filename)
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	58 {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	59 PyErr_SetString(PyExc_SyntaxError,
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	60 "from __future__ imports must occur at the "
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	61 "beginning of the file");
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	62 PyErr_SyntaxLocation(filename, n->n_lineno);
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	63 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	64
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	65 /* Relevant portions of the grammar:
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	66
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	67 single_input: NEWLINE \| simple_stmt \| compound_stmt NEWLINE
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	68 file_input: (NEWLINE \| stmt)* ENDMARKER
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	69 stmt: simple_stmt \| compound_stmt
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	70 simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	71 small_stmt: expr_stmt \| print_stmt \| del_stmt \| pass_stmt \| flow_stmt
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	72 \| import_stmt \| global_stmt \| exec_stmt \| assert_stmt
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	73 import_stmt: 'import' dotted_as_name (',' dotted_as_name)*
09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	74 \| 'from' dotted_name 'import' ('' \| import_as_name (',' import_as_name))
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	75 import_as_name: NAME [NAME NAME]
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	76 dotted_as_name: dotted_name [NAME NAME]
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	77 dotted_name: NAME ('.' NAME)*
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	78 */
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	79
19407 81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	80 /* future_parse() finds future statements at the beginnning of a
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	81 module. The function calls itself recursively, rather than
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	82 factoring out logic for different kinds of statements into
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	83 different routines.
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	84
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	85 Return values:
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	86 -1 indicates an error occurred, e.g. unknown feature name
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	87 0 indicates no feature was found
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	88 1 indicates a feature was found
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	89 */
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	90
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	91 static int
26601 cc05c2c8660e Constify filenames and scripts. Fixes #651362. Martin v. Löwis <martin@v.loewis.de> parents: 22968 diff changeset	92 future_parse(PyFutureFeatures ff, node n, const char *filename)
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	93 {
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	94 int i, r;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	95 loop:
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	96 switch (TYPE(n)) {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	97
16824 d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	98 case single_input:
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	99 if (TYPE(CHILD(n, 0)) == simple_stmt) {
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	100 n = CHILD(n, 0);
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	101 goto loop;
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	102 }
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	103 return 0;
d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	104
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	105 case file_input:
19407 81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	106 /* Check each statement in the file, starting with the
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	107 first, and continuing until the first statement
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	108 that isn't a future statement.
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	109 */
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	110 for (i = 0; i < NCH(n); i++) {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	111 node *ch = CHILD(n, i);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	112 if (TYPE(ch) == stmt) {
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	113 r = future_parse(ff, ch, filename);
19407 81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	114 /* Need to check both conditions below
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	115 to accomodate doc strings, which
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	116 causes r < 0.
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	117 */
81c7565a56ac Fix SF bug [ #450245 ] Error in parsing future stmts Jeremy Hylton <jeremy@alum.mit.edu> parents: 19158 diff changeset	118 if (r < 1 && !FUTURE_POSSIBLE(ff))
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	119 return r;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	120 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	121 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	122 return 0;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	123
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	124 case simple_stmt:
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	125 if (NCH(n) == 2) {
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	126 REQ(CHILD(n, 0), small_stmt);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	127 n = CHILD(n, 0);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	128 goto loop;
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	129 } else {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	130 /* Deal with the special case of a series of
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	131 small statements on a single line. If a
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	132 future statement follows some other
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	133 statement, the SyntaxError is raised here.
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	134 In all other cases, the symtable pass
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	135 raises the exception.
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	136 */
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	137 int found = 0, end_of_future = 0;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	138
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	139 for (i = 0; i < NCH(n); i += 2) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	140 if (TYPE(CHILD(n, i)) == small_stmt) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	141 r = future_parse(ff, CHILD(n, i),
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	142 filename);
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	143 if (r < 1)
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	144 end_of_future = 1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	145 else {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	146 found = 1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	147 if (end_of_future) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	148 future_error(n,
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	149 filename);
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	150 return -1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	151 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	152 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	153 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	154 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	155
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	156 /* If we found one and only one, then the
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	157 current lineno is legal.
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	158 */
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	159 if (found)
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	160 ff->ff_last_lineno = n->n_lineno + 1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	161 else
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	162 ff->ff_last_lineno = n->n_lineno;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	163
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	164 if (end_of_future && found)
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	165 return 1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	166 else
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	167 return 0;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	168 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	169
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	170 case stmt:
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	171 if (TYPE(CHILD(n, 0)) == simple_stmt) {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	172 n = CHILD(n, 0);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	173 goto loop;
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	174 } else if (TYPE(CHILD(n, 0)) == expr_stmt) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	175 n = CHILD(n, 0);
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	176 goto loop;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	177 } else {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	178 REQ(CHILD(n, 0), compound_stmt);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	179 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	180 return 0;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	181 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	182
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	183 case small_stmt:
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	184 n = CHILD(n, 0);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	185 goto loop;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	186
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	187 case import_stmt: {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	188 node *name;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	189
33353 f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	190 n = CHILD(n, 0);
f7474d31ba3f SF patch #1007189, multi-line imports, for instance: Anthony Baxter <anthonybaxter@gmail.com> parents: 26601 diff changeset	191 if (TYPE(n) != import_from) {
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	192 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	193 return 0;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	194 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	195 name = CHILD(n, 1);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	196 if (strcmp(STR(CHILD(name, 0)), "__future__") != 0)
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	197 return 0;
16838 09f6c1372056 Improve SyntaxErrors for bad future statements. Set file and location Jeremy Hylton <jeremy@alum.mit.edu> parents: 16824 diff changeset	198 if (future_check_features(ff, n, filename) < 0)
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	199 return -1;
16824 d4a315e4094c Need to support single_input explicitly so from __future__ imports Jeremy Hylton <jeremy@alum.mit.edu> parents: 16823 diff changeset	200 ff->ff_last_lineno = n->n_lineno + 1;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	201 return 1;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	202 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	203
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	204 /* The cases below -- all of them! -- are necessary to find
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	205 and skip doc strings. */
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	206 case expr_stmt:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	207 case testlist:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	208 case test:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	209 case and_test:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	210 case not_test:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	211 case comparison:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	212 case expr:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	213 case xor_expr:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	214 case and_expr:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	215 case shift_expr:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	216 case arith_expr:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	217 case term:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	218 case factor:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	219 case power:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	220 if (NCH(n) == 1) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	221 n = CHILD(n, 0);
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	222 goto loop;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	223 }
34539 8259ff3ee493 Fix bug that allowed future statements virtually anywhere in a module. Jeremy Hylton <jeremy@alum.mit.edu> parents: 33353 diff changeset	224 ff->ff_last_lineno = n->n_lineno;
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	225 break;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	226
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	227 case atom:
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	228 if (TYPE(CHILD(n, 0)) == STRING
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	229 && ff->ff_found_docstring == 0) {
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	230 ff->ff_found_docstring = 1;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	231 return 0;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	232 }
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	233 ff->ff_last_lineno = n->n_lineno;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	234 return 0;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	235
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	236 default:
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	237 ff->ff_last_lineno = n->n_lineno;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	238 return 0;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	239 }
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	240 return 0;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	241 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	242
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	243 PyFutureFeatures *
26601 cc05c2c8660e Constify filenames and scripts. Fixes #651362. Martin v. Löwis <martin@v.loewis.de> parents: 22968 diff changeset	244 PyNode_Future(node n, const char filename)
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	245 {
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	246 PyFutureFeatures *ff;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	247
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	248 ff = (PyFutureFeatures *)PyMem_Malloc(sizeof(PyFutureFeatures));
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	249 if (ff == NULL)
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	250 return NULL;
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	251 ff->ff_found_docstring = 0;
acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	252 ff->ff_last_lineno = -1;
19158 97a3d3d7029f Refactor future feature handling Jeremy Hylton <jeremy@alum.mit.edu> parents: 19051 diff changeset	253 ff->ff_features = 0;
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	254
16823 acbe74f3a786 Presumed correct compiler pass for future statements Jeremy Hylton <jeremy@alum.mit.edu> parents: 16799 diff changeset	255 if (future_parse(ff, n, filename) < 0) {
16799 08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	256 PyMem_Free((void *)ff);
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	257 return NULL;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	258 }
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	259 return ff;
08d937107fe6 Improved __future__ parser; still more to do Jeremy Hylton <jeremy@alum.mit.edu> parents: diff changeset	260 }

Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 35298:b2fe5f8fcfdd legacy-trunk