1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <algorithm>
10#include <iterator>
11#include <regex>
12
13_LIBCPP_BEGIN_NAMESPACE_STD
14
15static const char* make_error_type_string(regex_constants::error_type ecode) {
16 switch (ecode) {
17 case regex_constants::error_collate:
18 return "The expression contained an invalid collating element name.";
19 case regex_constants::error_ctype:
20 return "The expression contained an invalid character class name.";
21 case regex_constants::error_escape:
22 return "The expression contained an invalid escaped character, or a "
23 "trailing escape.";
24 case regex_constants::error_backref:
25 return "The expression contained an invalid back reference.";
26 case regex_constants::error_brack:
27 return "The expression contained mismatched [ and ].";
28 case regex_constants::error_paren:
29 return "The expression contained mismatched ( and ).";
30 case regex_constants::error_brace:
31 return "The expression contained mismatched { and }.";
32 case regex_constants::error_badbrace:
33 return "The expression contained an invalid range in a {} expression.";
34 case regex_constants::error_range:
35 return "The expression contained an invalid character range, "
36 "such as [b-a] in most encodings.";
37 case regex_constants::error_space:
38 return "There was insufficient memory to convert the expression into "
39 "a finite state machine.";
40 case regex_constants::error_badrepeat:
41 return "One of *?+{ was not preceded by a valid regular expression.";
42 case regex_constants::error_complexity:
43 return "The complexity of an attempted match against a regular "
44 "expression exceeded a pre-set level.";
45 case regex_constants::error_stack:
46 return "There was insufficient memory to determine whether the regular "
47 "expression could match the specified character sequence.";
48 case regex_constants::__re_err_grammar:
49 return "An invalid regex grammar has been requested.";
50 case regex_constants::__re_err_empty:
51 return "An empty regex is not allowed in the POSIX grammar.";
52 case regex_constants::__re_err_parse:
53 return "The parser did not consume the entire regular expression.";
54 default:
55 break;
56 }
57 return "Unknown error type";
58}
59
60regex_error::regex_error(regex_constants::error_type ecode)
61 : runtime_error(make_error_type_string(ecode)), __code_(ecode) {}
62
63regex_error::~regex_error() throw() {}
64
65namespace {
66
67struct collationnames {
68 const char* elem_;
69 char char_;
70};
71
72#if defined(__MVS__) && !defined(__NATIVE_ASCII_F)
73// EBCDIC IBM-1047
74// Sorted via the EBCDIC collating sequence
75const collationnames collatenames[] = {
76 {"a", 0x81},
77 {"alert", 0x2f},
78 {"ampersand", 0x50},
79 {"apostrophe", 0x7d},
80 {"asterisk", 0x5c},
81 {"b", 0x82},
82 {"backslash", 0xe0},
83 {"backspace", 0x16},
84 {"c", 0x83},
85 {"carriage-return", 0xd},
86 {"circumflex", 0x5f},
87 {"circumflex-accent", 0x5f},
88 {"colon", 0x7a},
89 {"comma", 0x6b},
90 {"commercial-at", 0x7c},
91 {"d", 0x84},
92 {"dollar-sign", 0x5b},
93 {"e", 0x85},
94 {"eight", 0xf8},
95 {"equals-sign", 0x7e},
96 {"exclamation-mark", 0x5a},
97 {"f", 0x86},
98 {"five", 0xf5},
99 {"form-feed", 0xc},
100 {"four", 0xf4},
101 {"full-stop", 0x4b},
102 {"g", 0x87},
103 {"grave-accent", 0x79},
104 {"greater-than-sign", 0x6e},
105 {"h", 0x88},
106 {"hyphen", 0x60},
107 {"hyphen-minus", 0x60},
108 {"i", 0x89},
109 {"j", 0x91},
110 {"k", 0x92},
111 {"l", 0x93},
112 {"left-brace", 0xc0},
113 {"left-curly-bracket", 0xc0},
114 {"left-parenthesis", 0x4d},
115 {"left-square-bracket", 0xad},
116 {"less-than-sign", 0x4c},
117 {"low-line", 0x6d},
118 {"m", 0x94},
119 {"n", 0x95},
120 {"newline", 0x15},
121 {"nine", 0xf9},
122 {"number-sign", 0x7b},
123 {"o", 0x96},
124 {"one", 0xf1},
125 {"p", 0x97},
126 {"percent-sign", 0x6c},
127 {"period", 0x4b},
128 {"plus-sign", 0x4e},
129 {"q", 0x98},
130 {"question-mark", 0x6f},
131 {"quotation-mark", 0x7f},
132 {"r", 0x99},
133 {"reverse-solidus", 0xe0},
134 {"right-brace", 0xd0},
135 {"right-curly-bracket", 0xd0},
136 {"right-parenthesis", 0x5d},
137 {"right-square-bracket", 0xbd},
138 {"s", 0xa2},
139 {"semicolon", 0x5e},
140 {"seven", 0xf7},
141 {"six", 0xf6},
142 {"slash", 0x61},
143 {"solidus", 0x61},
144 {"space", 0x40},
145 {"t", 0xa3},
146 {"tab", 0x5},
147 {"three", 0xf3},
148 {"tilde", 0xa1},
149 {"two", 0xf2},
150 {"u", 0xa4},
151 {"underscore", 0x6d},
152 {"v", 0xa5},
153 {"vertical-line", 0x4f},
154 {"vertical-tab", 0xb},
155 {"w", 0xa6},
156 {"x", 0xa7},
157 {"y", 0xa8},
158 {"z", 0xa9},
159 {"zero", 0xf0},
160 {"A", 0xc1},
161 {"B", 0xc2},
162 {"C", 0xc3},
163 {"D", 0xc4},
164 {"E", 0xc5},
165 {"F", 0xc6},
166 {"G", 0xc7},
167 {"H", 0xc8},
168 {"I", 0xc9},
169 {"J", 0xd1},
170 {"K", 0xd2},
171 {"L", 0xd3},
172 {"M", 0xd4},
173 {"N", 0xd5},
174 {"NUL", 0},
175 {"O", 0xd6},
176 {"P", 0xd7},
177 {"Q", 0xd8},
178 {"R", 0xd9},
179 {"S", 0xe2},
180 {"T", 0xe3},
181 {"U", 0xe4},
182 {"V", 0xe5},
183 {"W", 0xe6},
184 {"X", 0xe7},
185 {"Y", 0xe8},
186 {"Z", 0xe9}};
187#else
188// ASCII
189const collationnames collatenames[] = {
190 {.elem_: "A", .char_: 0x41},
191 {.elem_: "B", .char_: 0x42},
192 {.elem_: "C", .char_: 0x43},
193 {.elem_: "D", .char_: 0x44},
194 {.elem_: "E", .char_: 0x45},
195 {.elem_: "F", .char_: 0x46},
196 {.elem_: "G", .char_: 0x47},
197 {.elem_: "H", .char_: 0x48},
198 {.elem_: "I", .char_: 0x49},
199 {.elem_: "J", .char_: 0x4a},
200 {.elem_: "K", .char_: 0x4b},
201 {.elem_: "L", .char_: 0x4c},
202 {.elem_: "M", .char_: 0x4d},
203 {.elem_: "N", .char_: 0x4e},
204 {.elem_: "NUL", .char_: 0x00},
205 {.elem_: "O", .char_: 0x4f},
206 {.elem_: "P", .char_: 0x50},
207 {.elem_: "Q", .char_: 0x51},
208 {.elem_: "R", .char_: 0x52},
209 {.elem_: "S", .char_: 0x53},
210 {.elem_: "T", .char_: 0x54},
211 {.elem_: "U", .char_: 0x55},
212 {.elem_: "V", .char_: 0x56},
213 {.elem_: "W", .char_: 0x57},
214 {.elem_: "X", .char_: 0x58},
215 {.elem_: "Y", .char_: 0x59},
216 {.elem_: "Z", .char_: 0x5a},
217 {.elem_: "a", .char_: 0x61},
218 {.elem_: "alert", .char_: 0x07},
219 {.elem_: "ampersand", .char_: 0x26},
220 {.elem_: "apostrophe", .char_: 0x27},
221 {.elem_: "asterisk", .char_: 0x2a},
222 {.elem_: "b", .char_: 0x62},
223 {.elem_: "backslash", .char_: 0x5c},
224 {.elem_: "backspace", .char_: 0x08},
225 {.elem_: "c", .char_: 0x63},
226 {.elem_: "carriage-return", .char_: 0x0d},
227 {.elem_: "circumflex", .char_: 0x5e},
228 {.elem_: "circumflex-accent", .char_: 0x5e},
229 {.elem_: "colon", .char_: 0x3a},
230 {.elem_: "comma", .char_: 0x2c},
231 {.elem_: "commercial-at", .char_: 0x40},
232 {.elem_: "d", .char_: 0x64},
233 {.elem_: "dollar-sign", .char_: 0x24},
234 {.elem_: "e", .char_: 0x65},
235 {.elem_: "eight", .char_: 0x38},
236 {.elem_: "equals-sign", .char_: 0x3d},
237 {.elem_: "exclamation-mark", .char_: 0x21},
238 {.elem_: "f", .char_: 0x66},
239 {.elem_: "five", .char_: 0x35},
240 {.elem_: "form-feed", .char_: 0x0c},
241 {.elem_: "four", .char_: 0x34},
242 {.elem_: "full-stop", .char_: 0x2e},
243 {.elem_: "g", .char_: 0x67},
244 {.elem_: "grave-accent", .char_: 0x60},
245 {.elem_: "greater-than-sign", .char_: 0x3e},
246 {.elem_: "h", .char_: 0x68},
247 {.elem_: "hyphen", .char_: 0x2d},
248 {.elem_: "hyphen-minus", .char_: 0x2d},
249 {.elem_: "i", .char_: 0x69},
250 {.elem_: "j", .char_: 0x6a},
251 {.elem_: "k", .char_: 0x6b},
252 {.elem_: "l", .char_: 0x6c},
253 {.elem_: "left-brace", .char_: 0x7b},
254 {.elem_: "left-curly-bracket", .char_: 0x7b},
255 {.elem_: "left-parenthesis", .char_: 0x28},
256 {.elem_: "left-square-bracket", .char_: 0x5b},
257 {.elem_: "less-than-sign", .char_: 0x3c},
258 {.elem_: "low-line", .char_: 0x5f},
259 {.elem_: "m", .char_: 0x6d},
260 {.elem_: "n", .char_: 0x6e},
261 {.elem_: "newline", .char_: 0x0a},
262 {.elem_: "nine", .char_: 0x39},
263 {.elem_: "number-sign", .char_: 0x23},
264 {.elem_: "o", .char_: 0x6f},
265 {.elem_: "one", .char_: 0x31},
266 {.elem_: "p", .char_: 0x70},
267 {.elem_: "percent-sign", .char_: 0x25},
268 {.elem_: "period", .char_: 0x2e},
269 {.elem_: "plus-sign", .char_: 0x2b},
270 {.elem_: "q", .char_: 0x71},
271 {.elem_: "question-mark", .char_: 0x3f},
272 {.elem_: "quotation-mark", .char_: 0x22},
273 {.elem_: "r", .char_: 0x72},
274 {.elem_: "reverse-solidus", .char_: 0x5c},
275 {.elem_: "right-brace", .char_: 0x7d},
276 {.elem_: "right-curly-bracket", .char_: 0x7d},
277 {.elem_: "right-parenthesis", .char_: 0x29},
278 {.elem_: "right-square-bracket", .char_: 0x5d},
279 {.elem_: "s", .char_: 0x73},
280 {.elem_: "semicolon", .char_: 0x3b},
281 {.elem_: "seven", .char_: 0x37},
282 {.elem_: "six", .char_: 0x36},
283 {.elem_: "slash", .char_: 0x2f},
284 {.elem_: "solidus", .char_: 0x2f},
285 {.elem_: "space", .char_: 0x20},
286 {.elem_: "t", .char_: 0x74},
287 {.elem_: "tab", .char_: 0x09},
288 {.elem_: "three", .char_: 0x33},
289 {.elem_: "tilde", .char_: 0x7e},
290 {.elem_: "two", .char_: 0x32},
291 {.elem_: "u", .char_: 0x75},
292 {.elem_: "underscore", .char_: 0x5f},
293 {.elem_: "v", .char_: 0x76},
294 {.elem_: "vertical-line", .char_: 0x7c},
295 {.elem_: "vertical-tab", .char_: 0x0b},
296 {.elem_: "w", .char_: 0x77},
297 {.elem_: "x", .char_: 0x78},
298 {.elem_: "y", .char_: 0x79},
299 {.elem_: "z", .char_: 0x7a},
300 {.elem_: "zero", .char_: 0x30}};
301#endif
302
303struct classnames {
304 const char* elem_;
305 regex_traits<char>::char_class_type mask_;
306};
307
308const classnames ClassNames[] = {
309 {"alnum", ctype_base::alnum},
310 {"alpha", ctype_base::alpha},
311 {"blank", ctype_base::blank},
312 {"cntrl", ctype_base::cntrl},
313 {"d", ctype_base::digit},
314 {"digit", ctype_base::digit},
315 {"graph", ctype_base::graph},
316 {"lower", ctype_base::lower},
317 {"print", ctype_base::print},
318 {"punct", ctype_base::punct},
319 {"s", ctype_base::space},
320 {"space", ctype_base::space},
321 {"upper", ctype_base::upper},
322 {"w", regex_traits<char>::__regex_word},
323 {"xdigit", ctype_base::xdigit}};
324
325struct use_strcmp {
326 bool operator()(const collationnames& x, const char* y) { return strcmp(s1: x.elem_, s2: y) < 0; }
327 bool operator()(const classnames& x, const char* y) { return strcmp(s1: x.elem_, s2: y) < 0; }
328};
329
330} // namespace
331
332string __get_collation_name(const char* s) {
333 const collationnames* i = std::lower_bound(first: begin(arr: collatenames), last: end(arr: collatenames), val: s, comp: use_strcmp());
334 string r;
335 if (i != end(arr: collatenames) && strcmp(s1: s, s2: i->elem_) == 0)
336 r = char(i->char_);
337 return r;
338}
339
340regex_traits<char>::char_class_type __get_classname(const char* s, bool __icase) {
341 const classnames* i = std::lower_bound(begin(ClassNames), end(ClassNames), s, use_strcmp());
342 regex_traits<char>::char_class_type r = 0;
343 if (i != end(ClassNames) && strcmp(s1: s, s2: i->elem_) == 0) {
344 r = i->mask_;
345 if (r == regex_traits<char>::__regex_word)
346 r |= ctype_base::alnum | ctype_base::upper | ctype_base::lower;
347 else if (__icase) {
348 if (r & (ctype_base::lower | ctype_base::upper))
349 r |= ctype_base::alpha;
350 }
351 }
352 return r;
353}
354
355template <>
356void __match_any_but_newline<char>::__exec(__state& __s) const {
357 if (__s.__current_ != __s.__last_) {
358 switch (*__s.__current_) {
359 case '\r':
360 case '\n':
361 __s.__do_ = __state::__reject;
362 __s.__node_ = nullptr;
363 break;
364 default:
365 __s.__do_ = __state::__accept_and_consume;
366 ++__s.__current_;
367 __s.__node_ = this->first();
368 break;
369 }
370 } else {
371 __s.__do_ = __state::__reject;
372 __s.__node_ = nullptr;
373 }
374}
375
376template <>
377void __match_any_but_newline<wchar_t>::__exec(__state& __s) const {
378 if (__s.__current_ != __s.__last_) {
379 switch (*__s.__current_) {
380 case '\r':
381 case '\n':
382 case 0x2028:
383 case 0x2029:
384 __s.__do_ = __state::__reject;
385 __s.__node_ = nullptr;
386 break;
387 default:
388 __s.__do_ = __state::__accept_and_consume;
389 ++__s.__current_;
390 __s.__node_ = this->first();
391 break;
392 }
393 } else {
394 __s.__do_ = __state::__reject;
395 __s.__node_ = nullptr;
396 }
397}
398
399_LIBCPP_END_NAMESPACE_STD
400

source code of libcxx/src/regex.cpp