Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 56237:7ee140b7ef93

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fix an ambiguity in the grammar from the implementation of extended unpacking (one which was strangely "resolved" by pgen) This also kills the unused testlist1 rule and fixes parse tree validation of extended unpacking.
author Benjamin Peterson <benjamin@python.org>
date Sun, 27 Sep 2009 02:43:28 +0000
parents 0530aadff696
children cab14be0ada1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 }