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annotate Python/future.c @ 46120:78504d604b44

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Merged revisions 61952-61953 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r61952 | mark.dickinson | 2008-03-26 22:41:36 +0100 (Wed, 26 Mar 2008) | 2 lines Typo: "objects reference count" -> "object's reference count" ........ r61953 | christian.heimes | 2008-03-26 23:01:37 +0100 (Wed, 26 Mar 2008) | 4 lines Patch #2477: Added from __future__ import unicode_literals The new PyParser_*Ex() functions are based on Neal's suggestion and initial patch. The new __future__ feature makes all '' and r'' unicode strings. b'' and br'' stay (byte) strings. ........
author Christian Heimes <christian@cheimes.de>
date Wed, 26 Mar 2008 22:34:47 +0000
parents 91ac8049e709
children 85b67fb5672b
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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 = PyUnicode_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 continue;
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32 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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33 continue;
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34 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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35 continue;
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36 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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37 continue;
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38 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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39 continue;
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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 = PyUnicode_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;
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131 }
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132 ff->ff_features = 0;
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133 ff->ff_lineno = -1;
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134
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135 if (!future_parse(ff, mod, filename)) {
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136 PyObject_Free(ff);
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137 return NULL;
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138 }
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139 return ff;
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140 }