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annotate Python/future.c @ 44885:fefaa0e66fdd

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Merged revisions 60176-60209 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r60178 | georg.brandl | 2008-01-21 22:05:49 +0100 (Mon, 21 Jan 2008) | 2 lines #1715: include sub-extension modules in pydoc text output. ........ r60179 | georg.brandl | 2008-01-21 22:14:21 +0100 (Mon, 21 Jan 2008) | 2 lines Add a "const" to make gcc happy. ........ r60180 | georg.brandl | 2008-01-21 22:19:07 +0100 (Mon, 21 Jan 2008) | 2 lines Add the correct build dir when building with pydebug. ........ r60181 | georg.brandl | 2008-01-21 22:23:15 +0100 (Mon, 21 Jan 2008) | 3 lines Patch #1720595: add T_BOOL to the range of structmember types. Patch by Angelo Mottola, reviewed by MvL, tests by me. ........ r60182 | georg.brandl | 2008-01-21 22:28:32 +0100 (Mon, 21 Jan 2008) | 2 lines Reformat some ugly code. ........ r60187 | brett.cannon | 2008-01-22 00:50:16 +0100 (Tue, 22 Jan 2008) | 4 lines Make's MAKEFLAGS variable is set to a string containing the single-letter arguments to Make. This means there are no hyphens. Fix the '-s' check to silence distutils to now work. ........ r60188 | gregory.p.smith | 2008-01-22 01:19:41 +0100 (Tue, 22 Jan 2008) | 3 lines accepts and closes issue #1221598: adds an optional callback to ftplib.FTP storbinary() and storlines() methods. ........ r60189 | gregory.p.smith | 2008-01-22 02:12:02 +0100 (Tue, 22 Jan 2008) | 2 lines Replace spam.acquire() try: ... finally: spam.release() with "with spam:" ........ r60190 | gregory.p.smith | 2008-01-22 02:20:42 +0100 (Tue, 22 Jan 2008) | 4 lines - Fix Issue #1703448: A joined thread could show up in the threading.enumerate() list after the join() for a brief period until it actually exited. ........ r60193 | georg.brandl | 2008-01-22 08:53:31 +0100 (Tue, 22 Jan 2008) | 2 lines Fix \xhh specs, #1889. ........ r60198 | christian.heimes | 2008-01-22 16:01:25 +0100 (Tue, 22 Jan 2008) | 1 line Fixed a missing (X) in define ........ r60199 | christian.heimes | 2008-01-22 16:25:18 +0100 (Tue, 22 Jan 2008) | 2 lines Don't repeat yourself Added the macros PyModule_AddIntMacro and PyModule_AddStringMacro. They shorten PyModule_AddIntConstant(m, "AF_INET", AF_INET) to PyModule_AddIntMacro(m, AF_INET) ........ r60201 | raymond.hettinger | 2008-01-22 20:51:41 +0100 (Tue, 22 Jan 2008) | 1 line Document when to use izip_longest(). ........ r60202 | georg.brandl | 2008-01-22 20:56:03 +0100 (Tue, 22 Jan 2008) | 2 lines Fix for #1087741 patch. ........ r60203 | raymond.hettinger | 2008-01-22 21:18:53 +0100 (Tue, 22 Jan 2008) | 1 line Give zip() the same guarantee as izip() for left-to-right evaluation. ........ r60204 | raymond.hettinger | 2008-01-22 23:09:26 +0100 (Tue, 22 Jan 2008) | 1 line Improve variable name in sample code ........ r60205 | gregory.p.smith | 2008-01-23 00:15:34 +0100 (Wed, 23 Jan 2008) | 2 lines docstring and comment updates suggested by Giampaolo Rodola' ........ r60207 | raymond.hettinger | 2008-01-23 01:04:40 +0100 (Wed, 23 Jan 2008) | 1 line Let pprint() support sets and frozensets (suggested by David Mertz). ........ r60208 | guido.van.rossum | 2008-01-23 02:18:27 +0100 (Wed, 23 Jan 2008) | 4 lines I'm tired of these tests breaking at Google due to our large number of users and groups in LDAP/NIS. So I'm limiting the extra-heavy part of the tests to passwd/group files with at most 1000 entries. ........
author Christian Heimes <christian@cheimes.de>
date Wed, 23 Jan 2008 08:24:23 +0000
parents 305d7d2ce047
children 91ac8049e709
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1 #include "Python.h"
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2 #include "Python-ast.h"
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3 #include "node.h"
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4 #include "token.h"
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5 #include "graminit.h"
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6 #include "code.h"
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7 #include "compile.h"
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8 #include "symtable.h"
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9
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10 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
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11
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12 static int
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13 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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14 {
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15 int i;
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16 asdl_seq *names;
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17
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18 assert(s->kind == ImportFrom_kind);
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19
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20 names = s->v.ImportFrom.names;
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21 for (i = 0; i < asdl_seq_LEN(names); i++) {
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22 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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23 const char *feature = PyUnicode_AsString(name->name);
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24 if (!feature)
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25 return 0;
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26 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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27 continue;
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28 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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29 continue;
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30 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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31 continue;
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32 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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33 continue;
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34 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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35 continue;
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36 } else if (strcmp(feature, "braces") == 0) {
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37 PyErr_SetString(PyExc_SyntaxError,
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38 "not a chance");
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39 PyErr_SyntaxLocation(filename, s->lineno);
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40 return 0;
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41 } else {
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42 PyErr_Format(PyExc_SyntaxError,
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43 UNDEFINED_FUTURE_FEATURE, feature);
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44 PyErr_SyntaxLocation(filename, s->lineno);
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45 return 0;
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46 }
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47 }
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48 return 1;
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49 }
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50
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51 static int
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52 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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53 {
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54 int i, found_docstring = 0, done = 0, prev_line = 0;
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55
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56 static PyObject *future;
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57 if (!future) {
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58 future = PyUnicode_InternFromString("__future__");
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59 if (!future)
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60 return 0;
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61 }
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62
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63 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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64 return 1;
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65
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66 /* A subsequent pass will detect future imports that don't
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67 appear at the beginning of the file. There's one case,
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68 however, that is easier to handle here: A series of imports
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69 joined by semi-colons, where the first import is a future
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70 statement but some subsequent import has the future form
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71 but is preceded by a regular import.
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72 */
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73
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74
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75 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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76 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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77
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78 if (done && s->lineno > prev_line)
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79 return 1;
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80 prev_line = s->lineno;
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81
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82 /* The tests below will return from this function unless it is
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83 still possible to find a future statement. The only things
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84 that can precede a future statement are another future
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85 statement and a doc string.
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86 */
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87
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88 if (s->kind == ImportFrom_kind) {
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89 if (s->v.ImportFrom.module == future) {
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90 if (done) {
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91 PyErr_SetString(PyExc_SyntaxError,
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92 ERR_LATE_FUTURE);
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93 PyErr_SyntaxLocation(filename,
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94 s->lineno);
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95 return 0;
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96 }
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97 if (!future_check_features(ff, s, filename))
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98 return 0;
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99 ff->ff_lineno = s->lineno;
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100 }
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101 else
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102 done = 1;
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103 }
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104 else if (s->kind == Expr_kind && !found_docstring) {
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105 expr_ty e = s->v.Expr.value;
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106 if (e->kind != Str_kind)
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107 done = 1;
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108 else
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109 found_docstring = 1;
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110 }
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111 else
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112 done = 1;
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113 }
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114 return 1;
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115 }
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116
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117
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118 PyFutureFeatures *
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119 PyFuture_FromAST(mod_ty mod, const char *filename)
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120 {
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121 PyFutureFeatures *ff;
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122
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123 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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124 if (ff == NULL) {
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125 PyErr_NoMemory();
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126 return NULL;
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127 }
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128 ff->ff_features = 0;
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129 ff->ff_lineno = -1;
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130
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131 if (!future_parse(ff, mod, filename)) {
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132 PyObject_Free(ff);
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133 return NULL;
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134 }
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135 return ff;
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136 }