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annotate Python/future.c @ 45495:48488fa50729

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Merged revisions 61003-61033 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r61004 | georg.brandl | 2008-02-23 19:47:04 +0100 (Sat, 23 Feb 2008) | 2 lines Documentation coverage builder, part 1. ........ r61006 | andrew.kuchling | 2008-02-23 20:02:33 +0100 (Sat, 23 Feb 2008) | 1 line #1389051: IMAP module tries to read entire message in one chunk. Patch by Fredrik Lundh. ........ r61008 | andrew.kuchling | 2008-02-23 20:28:58 +0100 (Sat, 23 Feb 2008) | 1 line #1389051, #1092502: fix excessively large allocations when using read() on a socket ........ r61011 | jeffrey.yasskin | 2008-02-23 20:40:54 +0100 (Sat, 23 Feb 2008) | 13 lines Prevent classes like: class RunSelfFunction(object): def __init__(self): self.thread = threading.Thread(target=self._run) self.thread.start() def _run(self): pass from creating a permanent cycle between the object and the thread by having the Thread delete its references to the object when it completes. As an example of the effect of this bug, paramiko.Transport inherits from Thread to avoid it. ........ r61013 | jeffrey.yasskin | 2008-02-23 21:40:35 +0100 (Sat, 23 Feb 2008) | 3 lines Followup to r61011: Also avoid the reference cycle when the Thread's target raises an exception. ........ r61017 | georg.brandl | 2008-02-23 22:59:11 +0100 (Sat, 23 Feb 2008) | 2 lines #2101: fix removeAttribute docs. ........ r61018 | georg.brandl | 2008-02-23 23:05:38 +0100 (Sat, 23 Feb 2008) | 2 lines Add examples to modulefinder docs. Written for GHOP by Josip Dzolonga. ........ r61019 | georg.brandl | 2008-02-23 23:09:24 +0100 (Sat, 23 Feb 2008) | 2 lines Use os.closerange() in popen2. ........ r61020 | georg.brandl | 2008-02-23 23:14:02 +0100 (Sat, 23 Feb 2008) | 2 lines Use os.closerange(). ........ r61021 | georg.brandl | 2008-02-23 23:35:33 +0100 (Sat, 23 Feb 2008) | 3 lines In test_heapq and test_bisect, test both the Python and the C implementation. Originally written for GHOP by Josip Dzolonga, heavily patched by me. ........ r61024 | facundo.batista | 2008-02-23 23:54:12 +0100 (Sat, 23 Feb 2008) | 3 lines Added simple test case. Thanks Benjamin Peterson. ........ r61025 | georg.brandl | 2008-02-23 23:55:18 +0100 (Sat, 23 Feb 2008) | 2 lines #1825: correctly document msilib.add_data. ........ r61027 | georg.brandl | 2008-02-24 00:02:23 +0100 (Sun, 24 Feb 2008) | 2 lines #1826: allow dotted attribute paths in operator.attrgetter. ........ r61028 | georg.brandl | 2008-02-24 00:04:35 +0100 (Sun, 24 Feb 2008) | 2 lines #1506171: added operator.methodcaller(). ........ r61029 | georg.brandl | 2008-02-24 00:25:26 +0100 (Sun, 24 Feb 2008) | 2 lines Document import ./. threading issues. #1720705. ........ r61032 | georg.brandl | 2008-02-24 00:43:01 +0100 (Sun, 24 Feb 2008) | 2 lines Specify what kind of warning -3 emits. ........ r61033 | christian.heimes | 2008-02-24 00:59:45 +0100 (Sun, 24 Feb 2008) | 1 line MS Windows doesn't have mode_t but stat.st_mode is defined as unsigned short. ........
author Christian Heimes <christian@cheimes.de>
date Sun, 24 Feb 2008 00:38:49 +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 }