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annotate Python/future.c @ 78758:ca4bf8e10bc0

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Issue #15316: Let exceptions raised during imports triggered by the fromlist of __import__ propagate. The problem previously was that if something listed in fromlist didn't exist then that's okay. The fix for that was too broad in terms of catching ImportError. The trick with the solution to this issue is that the proper refactoring of import thanks to importlib doesn't allow for a way to distinguish (portably) between an ImportError because finders couldn't find a loader, or a loader raised the exception. In Python 3.4 the hope is to introduce a new exception (e.g. ModuleNotFound) to make it clean to differentiate why ImportError was raised.
author Brett Cannon <brett@python.org>
date Fri, 24 Aug 2012 18:25:59 -0400
parents b97964af7299
children 46cadd3955d0
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 "symtable.h"
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8
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9 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
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10 #define ERR_LATE_FUTURE \
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11 "from __future__ imports must occur at the beginning of the file"
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12
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13 static int
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14 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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15 {
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16 int i;
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17 asdl_seq *names;
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18
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19 assert(s->kind == ImportFrom_kind);
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20
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21 names = s->v.ImportFrom.names;
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22 for (i = 0; i < asdl_seq_LEN(names); i++) {
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23 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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24 const char *feature = _PyUnicode_AsString(name->name);
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25 if (!feature)
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26 return 0;
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27 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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28 continue;
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29 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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30 continue;
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31 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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32 continue;
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33 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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34 continue;
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35 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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36 continue;
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37 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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38 continue;
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39 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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40 continue;
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41 } else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {
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42 ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
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43 } else if (strcmp(feature, "braces") == 0) {
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44 PyErr_SetString(PyExc_SyntaxError,
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45 "not a chance");
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46 PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
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47 return 0;
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48 } else {
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49 PyErr_Format(PyExc_SyntaxError,
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50 UNDEFINED_FUTURE_FEATURE, feature);
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51 PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
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52 return 0;
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53 }
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54 }
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55 return 1;
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56 }
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57
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58 static int
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59 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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60 {
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61 int i, found_docstring = 0, done = 0, prev_line = 0;
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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 handle 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 identifier modname = s->v.ImportFrom.module;
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90 if (modname &&
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91 !PyUnicode_CompareWithASCIIString(modname, "__future__")) {
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92 if (done) {
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93 PyErr_SetString(PyExc_SyntaxError,
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94 ERR_LATE_FUTURE);
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95 PyErr_SyntaxLocationEx(filename, s->lineno, s->col_offset);
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96 return 0;
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97 }
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98 if (!future_check_features(ff, s, filename))
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99 return 0;
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100 ff->ff_lineno = s->lineno;
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101 }
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102 else
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103 done = 1;
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104 }
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105 else if (s->kind == Expr_kind && !found_docstring) {
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106 expr_ty e = s->v.Expr.value;
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107 if (e->kind != Str_kind)
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108 done = 1;
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109 else
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110 found_docstring = 1;
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111 }
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112 else
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113 done = 1;
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114 }
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115 return 1;
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116 }
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117
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118
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119 PyFutureFeatures *
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120 PyFuture_FromAST(mod_ty mod, const char *filename)
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121 {
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122 PyFutureFeatures *ff;
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123
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124 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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125 if (ff == NULL) {
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126 PyErr_NoMemory();
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127 return NULL;
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128 }
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129 ff->ff_features = 0;
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130 ff->ff_lineno = -1;
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131
61466
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parents: 52641
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132 if (!future_parse(ff, mod, filename)) {
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133 PyObject_Free(ff);
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134 return NULL;
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135 }
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parents: 52641
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136 return ff;
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137 }