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annotate Python/future.c @ 46690:c82f63efbc40

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Merged revisions 62713,62715,62728,62737,62740,62744,62749,62756 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62713 | georg.brandl | 2008-05-04 23:40:44 +0200 (Sun, 04 May 2008) | 2 lines #2695: Do case-insensitive check for algorithms. ........ r62715 | benjamin.peterson | 2008-05-05 00:39:33 +0200 (Mon, 05 May 2008) | 2 lines Remove method signatures from the docstrings of io.py ........ r62728 | martin.v.loewis | 2008-05-05 19:54:01 +0200 (Mon, 05 May 2008) | 2 lines Revert bogus checkin in r62724 to that file. ........ r62737 | georg.brandl | 2008-05-05 22:59:05 +0200 (Mon, 05 May 2008) | 2 lines #2769: markup glitch. ........ r62740 | georg.brandl | 2008-05-05 23:06:48 +0200 (Mon, 05 May 2008) | 2 lines #2752: fix second example too. ........ r62744 | gregory.p.smith | 2008-05-05 23:53:45 +0200 (Mon, 05 May 2008) | 13 lines Fix a bug introduced in r62627. see issue2760 and issue2632. An assertion in readline() would fail as data was already in the internal buffer even though the socket was in unbuffered read mode. That case is now handled. More importantly, read() has been fixed to not over-recv() and leave newly recv()d data in the _fileobject buffer. The max() vs min() issue in read() is now gone. Neither was correct. On bounded reads, always ask recv() for the exact amount of data we still need. Candidate for backporting to release25-maint along with r62627. ........ r62749 | brett.cannon | 2008-05-06 06:37:31 +0200 (Tue, 06 May 2008) | 3 lines Fix a bug in the handling of the stacklevel argument in warnings.warn() where the stack was being unwound by two levels instead of one each time. ........ r62756 | gregory.p.smith | 2008-05-06 09:05:18 +0200 (Tue, 06 May 2008) | 2 lines fix issue2707 - os.walk docstring example correctness typo. ........
author Christian Heimes <christian@cheimes.de>
date Tue, 06 May 2008 13:58:24 +0000
parents 78504d604b44
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 }