Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 57367:ed30bcffa146 legacy-trunk

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improve several corner cases related with argument names in parenthesis - Fix #7362: give a good error message for parenthesized arguments with defaults. - Add a py3k warning for any parenthesized arguments since those are not allowed in Py3. This warning is not given in tuple unpacking, since that incurs the tuple unpacking warning.
author Benjamin Peterson <benjamin@python.org>
date Thu, 19 Nov 2009 22:54:57 +0000
parents 96418f812f06
children fd25030223b0
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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 = PyString_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 ff->ff_features |= CO_FUTURE_DIVISION;
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34 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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35 ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
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36 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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37 ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
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38 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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39 ff->ff_features |= CO_FUTURE_PRINT_FUNCTION;
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40 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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41 ff->ff_features |= CO_FUTURE_UNICODE_LITERALS;
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42 } else if (strcmp(feature, "braces") == 0) {
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43 PyErr_SetString(PyExc_SyntaxError,
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44 "not a chance");
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45 PyErr_SyntaxLocation(filename, s->lineno);
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46 return 0;
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47 } else {
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48 PyErr_Format(PyExc_SyntaxError,
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49 UNDEFINED_FUTURE_FEATURE, feature);
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50 PyErr_SyntaxLocation(filename, s->lineno);
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51 return 0;
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52 }
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53 }
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54 return 1;
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55 }
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56
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57 static int
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58 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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59 {
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60 int i, found_docstring = 0, done = 0, prev_line = 0;
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61
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62 static PyObject *future;
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63 if (!future) {
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64 future = PyString_InternFromString("__future__");
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65 if (!future)
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66 return 0;
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67 }
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68
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69 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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70 return 1;
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71
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72 /* A subsequent pass will detect future imports that don't
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73 appear at the beginning of the file. There's one case,
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74 however, that is easier to handle here: A series of imports
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75 joined by semi-colons, where the first import is a future
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76 statement but some subsequent import has the future form
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77 but is preceded by a regular import.
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78 */
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79
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80
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81 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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82 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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83
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84 if (done && s->lineno > prev_line)
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85 return 1;
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86 prev_line = s->lineno;
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87
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88 /* The tests below will return from this function unless it is
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89 still possible to find a future statement. The only things
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90 that can precede a future statement are another future
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91 statement and a doc string.
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92 */
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93
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94 if (s->kind == ImportFrom_kind) {
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95 if (s->v.ImportFrom.module == future) {
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96 if (done) {
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97 PyErr_SetString(PyExc_SyntaxError,
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98 ERR_LATE_FUTURE);
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99 PyErr_SyntaxLocation(filename,
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100 s->lineno);
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101 return 0;
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102 }
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103 if (!future_check_features(ff, s, filename))
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104 return 0;
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105 ff->ff_lineno = s->lineno;
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106 }
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107 else
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108 done = 1;
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109 }
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110 else if (s->kind == Expr_kind && !found_docstring) {
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111 expr_ty e = s->v.Expr.value;
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112 if (e->kind != Str_kind)
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113 done = 1;
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114 else
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115 found_docstring = 1;
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116 }
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117 else
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118 done = 1;
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119 }
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120 return 1;
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121 }
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122
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123
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124 PyFutureFeatures *
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125 PyFuture_FromAST(mod_ty mod, const char *filename)
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126 {
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127 PyFutureFeatures *ff;
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128
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129 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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130 if (ff == NULL) {
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131 PyErr_NoMemory();
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132 return NULL;
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133 }
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134 ff->ff_features = 0;
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135 ff->ff_lineno = -1;
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136
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137 if (!future_parse(ff, mod, filename)) {
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138 PyObject_Free(ff);
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139 return NULL;
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140 }
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141 return ff;
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142 }