Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 35992:c0c12aa757e7 legacy-trunk

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Reduce scope of feature
author Neal Norwitz <nnorwitz@gmail.com>
date Tue, 06 Dec 2005 07:26:02 +0000
parents 11ee982f8c8d
children 5c36c222e7ca
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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 = 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, "braces") == 0) {
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33 PyErr_SetString(PyExc_SyntaxError,
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34 "not a chance");
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35 PyErr_SyntaxLocation(filename, s->lineno);
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36 return 0;
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37 } else {
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38 PyErr_Format(PyExc_SyntaxError,
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39 UNDEFINED_FUTURE_FEATURE, feature);
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40 PyErr_SyntaxLocation(filename, s->lineno);
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41 return 0;
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42 }
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43 }
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44 return 1;
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45 }
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46
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47 static int
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48 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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49 {
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50 int i, found_docstring = 0, done = 0, prev_line = 0;
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51
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52 static PyObject *future;
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53 if (!future) {
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54 future = PyString_InternFromString("__future__");
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55 if (!future)
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56 return 0;
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57 }
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58
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59 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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60 return 1;
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61
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62 /* A subsequent pass will detect future imports that don't
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63 appear at the beginning of the file. There's one case,
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64 however, that is easier to handl here: A series of imports
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65 joined by semi-colons, where the first import is a future
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66 statement but some subsequent import has the future form
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67 but is preceded by a regular import.
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68 */
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69
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70
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71 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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72 stmt_ty s = asdl_seq_GET(mod->v.Module.body, i);
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73
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74 if (done && s->lineno > prev_line)
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75 return 1;
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76 prev_line = s->lineno;
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77
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78 /* The tests below will return from this function unless it is
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79 still possible to find a future statement. The only things
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80 that can precede a future statement are another future
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81 statement and a doc string.
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82 */
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83
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84 if (s->kind == ImportFrom_kind) {
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85 if (s->v.ImportFrom.module == future) {
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86 if (done) {
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87 PyErr_SetString(PyExc_SyntaxError,
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88 ERR_LATE_FUTURE);
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89 PyErr_SyntaxLocation(filename,
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90 s->lineno);
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91 return 0;
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92 }
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93 if (!future_check_features(ff, s, filename))
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94 return 0;
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95 ff->ff_lineno = s->lineno;
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96 }
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97 else
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98 done = 1;
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99 }
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100 else if (s->kind == Expr_kind && !found_docstring) {
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101 expr_ty e = s->v.Expr.value;
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102 if (e->kind != Str_kind)
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103 done = 1;
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104 else
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105 found_docstring = 1;
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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 return 1;
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111 }
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112
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113
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114 PyFutureFeatures *
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115 PyFuture_FromAST(mod_ty mod, const char *filename)
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116 {
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117 PyFutureFeatures *ff;
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118
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119 ff = (PyFutureFeatures *)PyMem_Malloc(sizeof(PyFutureFeatures));
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120 if (ff == NULL)
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121 return NULL;
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122 ff->ff_features = 0;
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123 ff->ff_lineno = -1;
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124
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125 if (!future_parse(ff, mod, filename)) {
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126 PyMem_Free((void *)ff);
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127 return NULL;
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128 }
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129 return ff;
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130 }