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annotate Python/future.c @ 43686:1998ee0eff2c

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Try to fix some of the failing tests on Win64. PY_SSIZE_T_MAX (8 bytes) is larger than what can fit into a long (4 bytes). Hopefully this will fix more problems than it creates. There are many, many compile warnings on Win64. Each of these should be investigated to determine if they are real problems or not. Many of these presumably affect the trunk too.
author Neal Norwitz <nnorwitz@gmail.com>
date Fri, 26 Oct 2007 06:05:28 +0000
parents 302aeee32da8
children 305d7d2ce047
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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, "braces") == 0) {
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37 PyErr_SetString(PyExc_SyntaxError,
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38 "not a chance");
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39 PyErr_SyntaxLocation(filename, s->lineno);
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40 return 0;
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41 } else {
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42 PyErr_Format(PyExc_SyntaxError,
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43 UNDEFINED_FUTURE_FEATURE, feature);
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44 PyErr_SyntaxLocation(filename, s->lineno);
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45 return 0;
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46 }
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47 }
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48 return 1;
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49 }
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50
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51 static int
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52 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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53 {
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54 int i, found_docstring = 0, done = 0, prev_line = 0;
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55
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56 static PyObject *future;
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57 if (!future) {
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58 future = PyUnicode_InternFromString("__future__");
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59 if (!future)
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60 return 0;
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61 }
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62
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63 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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64 return 1;
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65
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66 /* A subsequent pass will detect future imports that don't
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67 appear at the beginning of the file. There's one case,
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68 however, that is easier to handl here: A series of imports
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69 joined by semi-colons, where the first import is a future
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70 statement but some subsequent import has the future form
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71 but is preceded by a regular import.
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72 */
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73
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74
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75 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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76 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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77
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78 if (done && s->lineno > prev_line)
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79 return 1;
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80 prev_line = s->lineno;
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81
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82 /* The tests below will return from this function unless it is
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83 still possible to find a future statement. The only things
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84 that can precede a future statement are another future
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85 statement and a doc string.
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86 */
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87
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88 if (s->kind == ImportFrom_kind) {
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89 if (s->v.ImportFrom.module == future) {
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90 if (done) {
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91 PyErr_SetString(PyExc_SyntaxError,
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92 ERR_LATE_FUTURE);
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93 PyErr_SyntaxLocation(filename,
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94 s->lineno);
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95 return 0;
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96 }
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97 if (!future_check_features(ff, s, filename))
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98 return 0;
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99 ff->ff_lineno = s->lineno;
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100 }
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101 else
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102 done = 1;
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103 }
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104 else if (s->kind == Expr_kind && !found_docstring) {
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105 expr_ty e = s->v.Expr.value;
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106 if (e->kind != Str_kind)
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107 done = 1;
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108 else
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109 found_docstring = 1;
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110 }
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111 else
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112 done = 1;
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113 }
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114 return 1;
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115 }
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116
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117
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118 PyFutureFeatures *
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119 PyFuture_FromAST(mod_ty mod, const char *filename)
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120 {
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121 PyFutureFeatures *ff;
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122
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123 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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124 if (ff == NULL) {
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125 PyErr_NoMemory();
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126 return NULL;
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127 }
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128 ff->ff_features = 0;
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129 ff->ff_lineno = -1;
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130
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131 if (!future_parse(ff, mod, filename)) {
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f731859e9b3b Merge p3yk branch with the trunk up to revision 45595. This breaks a fair
Thomas Wouters <thomas@python.org>
parents: 36988
diff changeset
132 PyObject_Free(ff);
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08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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133 return NULL;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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134 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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135 return ff;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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136 }