Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 1 | #include "Python.h" |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 2 | #include "Python-ast.h" |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 3 | #include "node.h" |
| 4 | #include "token.h" |
| 5 | #include "graminit.h" |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 6 | #include "code.h" |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 7 | #include "symtable.h" |
| 8 | |
| 9 | #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined" |
Benjamin Peterson | c0747cf | 2008-11-03 20:31:38 +0000 | [diff] [blame] | 10 | #define ERR_LATE_FUTURE \ |
| 11 | "from __future__ imports must occur at the beginning of the file" |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 12 | |
| 13 | static int |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 14 | future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename) |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 15 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 16 | int i; |
| 17 | asdl_seq *names; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 18 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 19 | assert(s->kind == ImportFrom_kind); |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 20 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 21 | names = s->v.ImportFrom.names; |
| 22 | for (i = 0; i < asdl_seq_LEN(names); i++) { |
| 23 | alias_ty name = (alias_ty)asdl_seq_GET(names, i); |
Serhiy Storchaka | 0651583 | 2016-11-20 09:13:07 +0200 | [diff] [blame] | 24 | const char *feature = PyUnicode_AsUTF8(name->name); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 25 | if (!feature) |
| 26 | return 0; |
| 27 | if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) { |
| 28 | continue; |
| 29 | } else if (strcmp(feature, FUTURE_GENERATORS) == 0) { |
| 30 | continue; |
| 31 | } else if (strcmp(feature, FUTURE_DIVISION) == 0) { |
| 32 | continue; |
| 33 | } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) { |
| 34 | continue; |
| 35 | } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) { |
| 36 | continue; |
| 37 | } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) { |
| 38 | continue; |
| 39 | } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) { |
| 40 | continue; |
| 41 | } else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) { |
| 42 | ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL; |
Yury Selivanov | 8170e8c | 2015-05-09 11:44:30 -0400 | [diff] [blame] | 43 | } else if (strcmp(feature, FUTURE_GENERATOR_STOP) == 0) { |
Yury Selivanov | 43c47fe | 2018-01-26 15:24:24 -0500 | [diff] [blame] | 44 | continue; |
Guido van Rossum | 95e4d58 | 2018-01-26 08:20:18 -0800 | [diff] [blame] | 45 | } else if (strcmp(feature, FUTURE_ANNOTATIONS) == 0) { |
| 46 | ff->ff_features |= CO_FUTURE_ANNOTATIONS; |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 47 | } else if (strcmp(feature, "braces") == 0) { |
| 48 | PyErr_SetString(PyExc_SyntaxError, |
| 49 | "not a chance"); |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 50 | PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 51 | return 0; |
| 52 | } else { |
| 53 | PyErr_Format(PyExc_SyntaxError, |
| 54 | UNDEFINED_FUTURE_FEATURE, feature); |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 55 | PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 56 | return 0; |
| 57 | } |
| 58 | } |
| 59 | return 1; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 60 | } |
| 61 | |
Neal Norwitz | 6576bd8 | 2005-11-13 18:41:28 +0000 | [diff] [blame] | 62 | static int |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 63 | future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename) |
Jeremy Hylton | 39e2f3f | 2001-02-28 01:58:08 +0000 | [diff] [blame] | 64 | { |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 65 | int i, done = 0, prev_line = 0; |
Serhiy Storchaka | 73cbe7a | 2018-05-29 12:04:55 +0300 | [diff] [blame^] | 66 | stmt_ty first; |
Jeremy Hylton | 39e2f3f | 2001-02-28 01:58:08 +0000 | [diff] [blame] | 67 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 68 | if (!(mod->kind == Module_kind || mod->kind == Interactive_kind)) |
| 69 | return 1; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 70 | |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 71 | if (asdl_seq_LEN(mod->v.Module.body) == 0) |
| 72 | return 1; |
| 73 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 74 | /* A subsequent pass will detect future imports that don't |
| 75 | appear at the beginning of the file. There's one case, |
| 76 | however, that is easier to handle here: A series of imports |
| 77 | joined by semi-colons, where the first import is a future |
| 78 | statement but some subsequent import has the future form |
| 79 | but is preceded by a regular import. |
| 80 | */ |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 81 | |
Serhiy Storchaka | 73cbe7a | 2018-05-29 12:04:55 +0300 | [diff] [blame^] | 82 | i = 0; |
| 83 | first = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i); |
| 84 | if (first->kind == Expr_kind |
| 85 | && (first->v.Expr.value->kind == Str_kind |
| 86 | || (first->v.Expr.value->kind == Constant_kind |
| 87 | && PyUnicode_CheckExact(first->v.Expr.value->v.Constant.value)))) |
| 88 | i++; |
| 89 | |
| 90 | for (; i < asdl_seq_LEN(mod->v.Module.body); i++) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 91 | stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i); |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 92 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 93 | if (done && s->lineno > prev_line) |
| 94 | return 1; |
| 95 | prev_line = s->lineno; |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 96 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 97 | /* The tests below will return from this function unless it is |
| 98 | still possible to find a future statement. The only things |
| 99 | that can precede a future statement are another future |
| 100 | statement and a doc string. |
| 101 | */ |
| 102 | |
| 103 | if (s->kind == ImportFrom_kind) { |
Kristján Valur Jónsson | c5d47d5 | 2012-03-23 12:50:53 +0000 | [diff] [blame] | 104 | identifier modname = s->v.ImportFrom.module; |
Benjamin Peterson | ab79c71 | 2012-03-22 08:56:15 -0400 | [diff] [blame] | 105 | if (modname && |
Serhiy Storchaka | f4934ea | 2016-11-16 10:17:58 +0200 | [diff] [blame] | 106 | _PyUnicode_EqualToASCIIString(modname, "__future__")) { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 107 | if (done) { |
| 108 | PyErr_SetString(PyExc_SyntaxError, |
| 109 | ERR_LATE_FUTURE); |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 110 | PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 111 | return 0; |
| 112 | } |
| 113 | if (!future_check_features(ff, s, filename)) |
| 114 | return 0; |
| 115 | ff->ff_lineno = s->lineno; |
| 116 | } |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 117 | else { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 118 | done = 1; |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 119 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 120 | } |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 121 | else { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 122 | done = 1; |
Benjamin Peterson | 2d6acd2 | 2013-03-16 09:15:47 -0700 | [diff] [blame] | 123 | } |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 124 | } |
| 125 | return 1; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 126 | } |
| 127 | |
Jeremy Hylton | 3e0055f | 2005-10-20 19:59:25 +0000 | [diff] [blame] | 128 | |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 129 | PyFutureFeatures * |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 130 | PyFuture_FromASTObject(mod_ty mod, PyObject *filename) |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 131 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 132 | PyFutureFeatures *ff; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 133 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 134 | ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures)); |
| 135 | if (ff == NULL) { |
| 136 | PyErr_NoMemory(); |
| 137 | return NULL; |
| 138 | } |
| 139 | ff->ff_features = 0; |
| 140 | ff->ff_lineno = -1; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 141 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 142 | if (!future_parse(ff, mod, filename)) { |
| 143 | PyObject_Free(ff); |
| 144 | return NULL; |
| 145 | } |
| 146 | return ff; |
Jeremy Hylton | 4db62b1 | 2001-02-27 19:07:02 +0000 | [diff] [blame] | 147 | } |
Victor Stinner | 14e461d | 2013-08-26 22:28:21 +0200 | [diff] [blame] | 148 | |
| 149 | |
| 150 | PyFutureFeatures * |
| 151 | PyFuture_FromAST(mod_ty mod, const char *filename_str) |
| 152 | { |
| 153 | PyFutureFeatures *ff; |
| 154 | PyObject *filename; |
| 155 | |
| 156 | filename = PyUnicode_DecodeFSDefault(filename_str); |
| 157 | if (filename == NULL) |
| 158 | return NULL; |
| 159 | ff = PyFuture_FromASTObject(mod, filename); |
| 160 | Py_DECREF(filename); |
| 161 | return ff; |
| 162 | } |