Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 63757:c16803bbd790

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Issue #9079: Added _PyTime_gettimeofday(_PyTime_timeval *tp) to C API exposed in Python.h. This function is similar to POSIX gettimeofday(struct timeval *tp), but available on platforms without gettimeofday().
author Alexander Belopolsky <alexander.belopolsky@gmail.com>
date Thu, 05 Aug 2010 17:34:27 +0000
parents cab14be0ada1
children 861c35cef7aa
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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 #define ERR_LATE_FUTURE \
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12 "from __future__ imports must occur at the beginning of the file"
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13
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14 static int
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15 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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16 {
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17 int i;
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18 asdl_seq *names;
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19
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20 assert(s->kind == ImportFrom_kind);
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21
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22 names = s->v.ImportFrom.names;
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23 for (i = 0; i < asdl_seq_LEN(names); i++) {
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24 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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25 const char *feature = _PyUnicode_AsString(name->name);
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26 if (!feature)
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27 return 0;
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28 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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29 continue;
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30 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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31 continue;
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32 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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33 continue;
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34 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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35 continue;
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36 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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37 continue;
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38 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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39 continue;
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40 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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41 continue;
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42 } else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {
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43 ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
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44 } else if (strcmp(feature, "braces") == 0) {
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45 PyErr_SetString(PyExc_SyntaxError,
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46 "not a chance");
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47 PyErr_SyntaxLocation(filename, s->lineno);
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48 return 0;
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49 } else {
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50 PyErr_Format(PyExc_SyntaxError,
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51 UNDEFINED_FUTURE_FEATURE, feature);
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52 PyErr_SyntaxLocation(filename, s->lineno);
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53 return 0;
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54 }
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55 }
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56 return 1;
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57 }
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58
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59 static int
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60 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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61 {
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62 int i, found_docstring = 0, done = 0, prev_line = 0;
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63
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64 static PyObject *future;
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65 if (!future) {
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66 future = PyUnicode_InternFromString("__future__");
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67 if (!future)
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68 return 0;
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69 }
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70
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71 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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72 return 1;
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73
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74 /* A subsequent pass will detect future imports that don't
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75 appear at the beginning of the file. There's one case,
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76 however, that is easier to handle here: A series of imports
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77 joined by semi-colons, where the first import is a future
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78 statement but some subsequent import has the future form
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79 but is preceded by a regular import.
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80 */
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81
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82
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83 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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84 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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85
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86 if (done && s->lineno > prev_line)
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87 return 1;
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88 prev_line = s->lineno;
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89
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90 /* The tests below will return from this function unless it is
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91 still possible to find a future statement. The only things
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92 that can precede a future statement are another future
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93 statement and a doc string.
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94 */
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95
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96 if (s->kind == ImportFrom_kind) {
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97 if (s->v.ImportFrom.module == future) {
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98 if (done) {
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99 PyErr_SetString(PyExc_SyntaxError,
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100 ERR_LATE_FUTURE);
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101 PyErr_SyntaxLocation(filename,
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102 s->lineno);
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103 return 0;
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104 }
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105 if (!future_check_features(ff, s, filename))
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106 return 0;
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107 ff->ff_lineno = s->lineno;
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108 }
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109 else
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110 done = 1;
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111 }
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112 else if (s->kind == Expr_kind && !found_docstring) {
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113 expr_ty e = s->v.Expr.value;
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114 if (e->kind != Str_kind)
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115 done = 1;
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116 else
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117 found_docstring = 1;
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118 }
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119 else
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120 done = 1;
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121 }
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122 return 1;
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123 }
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124
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125
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126 PyFutureFeatures *
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127 PyFuture_FromAST(mod_ty mod, const char *filename)
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128 {
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129 PyFutureFeatures *ff;
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130
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131 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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132 if (ff == NULL) {
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133 PyErr_NoMemory();
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134 return NULL;
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135 }
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136 ff->ff_features = 0;
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137 ff->ff_lineno = -1;
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138
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139 if (!future_parse(ff, mod, filename)) {
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140 PyObject_Free(ff);
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141 return NULL;
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142 }
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143 return ff;
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144 }