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annotate Python/future.c @ 56959:032d9749047d 2.6

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Merged revisions 75931 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r75931 | benjamin.peterson | 2009-10-28 20:49:07 -0500 (Wed, 28 Oct 2009) | 5 lines do a backport of r75928 The added test does not fail without the patch, but we still fix the issue of surrogates being used in wide builds where they should not be. ........
author Benjamin Peterson <benjamin@python.org>
date Thu, 29 Oct 2009 02:02:47 +0000
parents 52294af4b663
children e38335d4df91 96418f812f06
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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 = PyString_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 ff->ff_features |= CO_FUTURE_DIVISION;
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32 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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33 ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
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34 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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35 ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
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36 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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37 ff->ff_features |= CO_FUTURE_PRINT_FUNCTION;
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38 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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39 ff->ff_features |= CO_FUTURE_UNICODE_LITERALS;
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40 } else if (strcmp(feature, "braces") == 0) {
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41 PyErr_SetString(PyExc_SyntaxError,
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42 "not a chance");
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43 PyErr_SyntaxLocation(filename, s->lineno);
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44 return 0;
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45 } else {
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46 PyErr_Format(PyExc_SyntaxError,
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47 UNDEFINED_FUTURE_FEATURE, feature);
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48 PyErr_SyntaxLocation(filename, s->lineno);
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49 return 0;
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50 }
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51 }
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52 return 1;
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53 }
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54
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55 static int
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56 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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57 {
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58 int i, found_docstring = 0, done = 0, prev_line = 0;
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59
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60 static PyObject *future;
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61 if (!future) {
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62 future = PyString_InternFromString("__future__");
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63 if (!future)
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64 return 0;
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65 }
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66
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67 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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68 return 1;
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69
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70 /* A subsequent pass will detect future imports that don't
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71 appear at the beginning of the file. There's one case,
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72 however, that is easier to handle here: A series of imports
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73 joined by semi-colons, where the first import is a future
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74 statement but some subsequent import has the future form
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75 but is preceded by a regular import.
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76 */
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77
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78
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79 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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80 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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81
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82 if (done && s->lineno > prev_line)
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83 return 1;
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84 prev_line = s->lineno;
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85
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86 /* The tests below will return from this function unless it is
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87 still possible to find a future statement. The only things
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88 that can precede a future statement are another future
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89 statement and a doc string.
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90 */
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91
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92 if (s->kind == ImportFrom_kind) {
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93 if (s->v.ImportFrom.module == future) {
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94 if (done) {
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95 PyErr_SetString(PyExc_SyntaxError,
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96 ERR_LATE_FUTURE);
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97 PyErr_SyntaxLocation(filename,
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98 s->lineno);
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99 return 0;
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100 }
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101 if (!future_check_features(ff, s, filename))
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102 return 0;
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103 ff->ff_lineno = s->lineno;
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104 }
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105 else
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106 done = 1;
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107 }
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108 else if (s->kind == Expr_kind && !found_docstring) {
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109 expr_ty e = s->v.Expr.value;
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110 if (e->kind != Str_kind)
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111 done = 1;
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112 else
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113 found_docstring = 1;
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114 }
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115 else
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116 done = 1;
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117 }
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118 return 1;
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119 }
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120
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121
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122 PyFutureFeatures *
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123 PyFuture_FromAST(mod_ty mod, const char *filename)
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124 {
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125 PyFutureFeatures *ff;
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126
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127 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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128 if (ff == NULL) {
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129 PyErr_NoMemory();
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130 return NULL;
39139
75a7106662a3 Handle more mem alloc issues found with failmalloc
Neal Norwitz <nnorwitz@gmail.com>
parents: 37606
diff changeset
131 }
19158
97a3d3d7029f Refactor future feature handling
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 19051
diff changeset
132 ff->ff_features = 0;
35742
1c4d192f1568 Merge ast-branch to head
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 34539
diff changeset
133 ff->ff_lineno = -1;
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
134
35742
1c4d192f1568 Merge ast-branch to head
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 34539
diff changeset
135 if (!future_parse(ff, mod, filename)) {
37558
286c81689826 Use PyObject_* allocator since FutureFeatures is small
Neal Norwitz <nnorwitz@gmail.com>
parents: 37418
diff changeset
136 PyObject_Free(ff);
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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137 return NULL;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
138 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
139 return ff;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
140 }