Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 65695:64cee8d11f2e 2.7

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Merged revisions 85904 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r85904 | benjamin.peterson | 2010-10-28 22:28:14 -0500 (Thu, 28 Oct 2010) | 1 line decrement offset when it points to a newline (#10186 followup) ........
author Benjamin Peterson <benjamin@python.org>
date Fri, 29 Oct 2010 03:45:34 +0000
parents fd25030223b0
children b36cb4602e21
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rev   line source
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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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parents: 49621
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133 }
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134 ff->ff_features = 0;
fd25030223b0 Untabify C files. Will watch buildbots.
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parents: 49621
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135 ff->ff_lineno = -1;
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08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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136
61463
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diff changeset
137 if (!future_parse(ff, mod, filename)) {
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138 PyObject_Free(ff);
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139 return NULL;
fd25030223b0 Untabify C files. Will watch buildbots.
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parents: 49621
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140 }
fd25030223b0 Untabify C files. Will watch buildbots.
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parents: 49621
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141 return ff;
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142 }