1 // class template regex -*- C++ -*- 2 3 // Copyright (C) 2010-2015 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** 26 * @file bits/regex_compiler.h 27 * This is an internal header file, included by other library headers. 28 * Do not attempt to use it directly. @headername{regex} 29 */ 30 31 namespace std _GLIBCXX_VISIBILITY(default) 32 { 33 namespace __detail 34 { 35 _GLIBCXX_BEGIN_NAMESPACE_VERSION 36 37 /** 38 * @addtogroup regex-detail 39 * @{ 40 */ 41 42 template<typename, bool, bool> 43 struct _BracketMatcher; 44 45 /** 46 * @brief Builds an NFA from an input iterator range. 47 * 48 * The %_TraitsT type should fulfill requirements [28.3]. 49 */ 50 template<typename _TraitsT> 51 class _Compiler 52 { 53 public: 54 typedef typename _TraitsT::char_type _CharT; 55 typedef const _CharT* _IterT; 56 typedef _NFA<_TraitsT> _RegexT; 57 typedef regex_constants::syntax_option_type _FlagT; 58 59 _Compiler(_IterT __b, _IterT __e, 60 const typename _TraitsT::locale_type& __traits, _FlagT __flags); 61 62 shared_ptr<const _RegexT> 63 _M_get_nfa() 64 { return std::move(_M_nfa); } 65 66 private: 67 typedef _Scanner<_CharT> _ScannerT; 68 typedef typename _TraitsT::string_type _StringT; 69 typedef typename _ScannerT::_TokenT _TokenT; 70 typedef _StateSeq<_TraitsT> _StateSeqT; 71 typedef std::stack<_StateSeqT> _StackT; 72 typedef std::ctype<_CharT> _CtypeT; 73 74 // accepts a specific token or returns false. 75 bool 76 _M_match_token(_TokenT __token); 77 78 void 79 _M_disjunction(); 80 81 void 82 _M_alternative(); 83 84 bool 85 _M_term(); 86 87 bool 88 _M_assertion(); 89 90 bool 91 _M_quantifier(); 92 93 bool 94 _M_atom(); 95 96 bool 97 _M_bracket_expression(); 98 99 template<bool __icase, bool __collate> 100 void 101 _M_insert_any_matcher_ecma(); 102 103 template<bool __icase, bool __collate> 104 void 105 _M_insert_any_matcher_posix(); 106 107 template<bool __icase, bool __collate> 108 void 109 _M_insert_char_matcher(); 110 111 template<bool __icase, bool __collate> 112 void 113 _M_insert_character_class_matcher(); 114 115 template<bool __icase, bool __collate> 116 void 117 _M_insert_bracket_matcher(bool __neg); 118 119 // Returns true if successfully matched one term and should continue. 120 // Returns false if the compiler should move on. 121 template<bool __icase, bool __collate> 122 bool 123 _M_expression_term(pair<bool, _CharT>& __last_char, 124 _BracketMatcher<_TraitsT, __icase, __collate>& 125 __matcher); 126 127 int 128 _M_cur_int_value(int __radix); 129 130 bool 131 _M_try_char(); 132 133 _StateSeqT 134 _M_pop() 135 { 136 auto ret = _M_stack.top(); 137 _M_stack.pop(); 138 return ret; 139 } 140 141 _FlagT _M_flags; 142 _ScannerT _M_scanner; 143 shared_ptr<_RegexT> _M_nfa; 144 _StringT _M_value; 145 _StackT _M_stack; 146 const _TraitsT& _M_traits; 147 const _CtypeT& _M_ctype; 148 }; 149 150 template<typename _Tp> 151 struct __has_contiguous_iter : std::false_type { }; 152 153 template<typename _Ch, typename _Tr, typename _Alloc> 154 struct __has_contiguous_iter<std::basic_string<_Ch, _Tr, _Alloc>> 155 : std::true_type 156 { }; 157 158 template<typename _Tp, typename _Alloc> 159 struct __has_contiguous_iter<std::vector<_Tp, _Alloc>> 160 : std::true_type 161 { }; 162 163 template<typename _Tp> 164 struct __is_contiguous_normal_iter : std::false_type { }; 165 166 template<typename _CharT> 167 struct __is_contiguous_normal_iter<_CharT*> : std::true_type { }; 168 169 template<typename _Tp, typename _Cont> 170 struct 171 __is_contiguous_normal_iter<__gnu_cxx::__normal_iterator<_Tp, _Cont>> 172 : __has_contiguous_iter<_Cont>::type 173 { }; 174 175 template<typename _Iter, typename _TraitsT> 176 using __enable_if_contiguous_normal_iter 177 = typename enable_if< __is_contiguous_normal_iter<_Iter>::value, 178 std::shared_ptr<const _NFA<_TraitsT>> >::type; 179 180 template<typename _Iter, typename _TraitsT> 181 using __disable_if_contiguous_normal_iter 182 = typename enable_if< !__is_contiguous_normal_iter<_Iter>::value, 183 std::shared_ptr<const _NFA<_TraitsT>> >::type; 184 185 template<typename _FwdIter, typename _TraitsT> 186 inline __enable_if_contiguous_normal_iter<_FwdIter, _TraitsT> 187 __compile_nfa(_FwdIter __first, _FwdIter __last, 188 const typename _TraitsT::locale_type& __loc, 189 regex_constants::syntax_option_type __flags) 190 { 191 size_t __len = __last - __first; 192 const auto* __cfirst = __len ? std::__addressof(*__first) : nullptr; 193 using _Cmplr = _Compiler<_TraitsT>; 194 return _Cmplr(__cfirst, __cfirst + __len, __loc, __flags)._M_get_nfa(); 195 } 196 197 template<typename _FwdIter, typename _TraitsT> 198 inline __disable_if_contiguous_normal_iter<_FwdIter, _TraitsT> 199 __compile_nfa(_FwdIter __first, _FwdIter __last, 200 const typename _TraitsT::locale_type& __loc, 201 regex_constants::syntax_option_type __flags) 202 { 203 basic_string<typename _TraitsT::char_type> __str(__first, __last); 204 return __compile_nfa(__str.data(), __str.data() + __str.size(), __loc, 205 __flags); 206 } 207 208 // [28.13.14] 209 template<typename _TraitsT, bool __icase, bool __collate> 210 class _RegexTranslator 211 { 212 public: 213 typedef typename _TraitsT::char_type _CharT; 214 typedef typename _TraitsT::string_type _StringT; 215 typedef typename std::conditional<__collate, 216 _StringT, 217 _CharT>::type _StrTransT; 218 219 explicit 220 _RegexTranslator(const _TraitsT& __traits) 221 : _M_traits(__traits) 222 { } 223 224 _CharT 225 _M_translate(_CharT __ch) const 226 { 227 if (__icase) 228 return _M_traits.translate_nocase(__ch); 229 else if (__collate) 230 return _M_traits.translate(__ch); 231 else 232 return __ch; 233 } 234 235 _StrTransT 236 _M_transform(_CharT __ch) const 237 { 238 return _M_transform_impl(__ch, typename integral_constant<bool, 239 __collate>::type()); 240 } 241 242 private: 243 _StrTransT 244 _M_transform_impl(_CharT __ch, false_type) const 245 { return __ch; } 246 247 _StrTransT 248 _M_transform_impl(_CharT __ch, true_type) const 249 { 250 _StrTransT __str = _StrTransT(1, _M_translate(__ch)); 251 return _M_traits.transform(__str.begin(), __str.end()); 252 } 253 254 const _TraitsT& _M_traits; 255 }; 256 257 template<typename _TraitsT> 258 class _RegexTranslator<_TraitsT, false, false> 259 { 260 public: 261 typedef typename _TraitsT::char_type _CharT; 262 typedef _CharT _StrTransT; 263 264 explicit 265 _RegexTranslator(const _TraitsT&) 266 { } 267 268 _CharT 269 _M_translate(_CharT __ch) const 270 { return __ch; } 271 272 _StrTransT 273 _M_transform(_CharT __ch) const 274 { return __ch; } 275 }; 276 277 template<typename _TraitsT, bool __is_ecma, bool __icase, bool __collate> 278 struct _AnyMatcher; 279 280 template<typename _TraitsT, bool __icase, bool __collate> 281 struct _AnyMatcher<_TraitsT, false, __icase, __collate> 282 { 283 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 284 typedef typename _TransT::_CharT _CharT; 285 286 explicit 287 _AnyMatcher(const _TraitsT& __traits) 288 : _M_translator(__traits) 289 { } 290 291 bool 292 operator()(_CharT __ch) const 293 { 294 static auto __nul = _M_translator._M_translate('\0'); 295 return _M_translator._M_translate(__ch) != __nul; 296 } 297 298 _TransT _M_translator; 299 }; 300 301 template<typename _TraitsT, bool __icase, bool __collate> 302 struct _AnyMatcher<_TraitsT, true, __icase, __collate> 303 { 304 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 305 typedef typename _TransT::_CharT _CharT; 306 307 explicit 308 _AnyMatcher(const _TraitsT& __traits) 309 : _M_translator(__traits) 310 { } 311 312 bool 313 operator()(_CharT __ch) const 314 { return _M_apply(__ch, typename is_same<_CharT, char>::type()); } 315 316 bool 317 _M_apply(_CharT __ch, true_type) const 318 { 319 auto __c = _M_translator._M_translate(__ch); 320 auto __n = _M_translator._M_translate('\n'); 321 auto __r = _M_translator._M_translate('\r'); 322 return __c != __n && __c != __r; 323 } 324 325 bool 326 _M_apply(_CharT __ch, false_type) const 327 { 328 auto __c = _M_translator._M_translate(__ch); 329 auto __n = _M_translator._M_translate('\n'); 330 auto __r = _M_translator._M_translate('\r'); 331 auto __u2028 = _M_translator._M_translate(u'\u2028'); 332 auto __u2029 = _M_translator._M_translate(u'\u2029'); 333 return __c != __n && __c != __r && __c != __u2028 && __c != __u2029; 334 } 335 336 _TransT _M_translator; 337 }; 338 339 template<typename _TraitsT, bool __icase, bool __collate> 340 struct _CharMatcher 341 { 342 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 343 typedef typename _TransT::_CharT _CharT; 344 345 _CharMatcher(_CharT __ch, const _TraitsT& __traits) 346 : _M_translator(__traits), _M_ch(_M_translator._M_translate(__ch)) 347 { } 348 349 bool 350 operator()(_CharT __ch) const 351 { return _M_ch == _M_translator._M_translate(__ch); } 352 353 _TransT _M_translator; 354 _CharT _M_ch; 355 }; 356 357 /// Matches a character range (bracket expression) 358 template<typename _TraitsT, bool __icase, bool __collate> 359 struct _BracketMatcher 360 { 361 public: 362 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 363 typedef typename _TransT::_CharT _CharT; 364 typedef typename _TransT::_StrTransT _StrTransT; 365 typedef typename _TraitsT::string_type _StringT; 366 typedef typename _TraitsT::char_class_type _CharClassT; 367 368 public: 369 _BracketMatcher(bool __is_non_matching, 370 const _TraitsT& __traits) 371 : _M_class_set(0), _M_translator(__traits), _M_traits(__traits), 372 _M_is_non_matching(__is_non_matching) 373 #ifdef _GLIBCXX_DEBUG 374 , _M_is_ready(false) 375 #endif 376 { } 377 378 bool 379 operator()(_CharT __ch) const 380 { 381 _GLIBCXX_DEBUG_ASSERT(_M_is_ready); 382 return _M_apply(__ch, _UseCache()); 383 } 384 385 void 386 _M_add_char(_CharT __c) 387 { 388 _M_char_set.push_back(_M_translator._M_translate(__c)); 389 #ifdef _GLIBCXX_DEBUG 390 _M_is_ready = false; 391 #endif 392 } 393 394 _StringT 395 _M_add_collate_element(const _StringT& __s) 396 { 397 auto __st = _M_traits.lookup_collatename(__s.data(), 398 __s.data() + __s.size()); 399 if (__st.empty()) 400 __throw_regex_error(regex_constants::error_collate); 401 _M_char_set.push_back(_M_translator._M_translate(__st[0])); 402 #ifdef _GLIBCXX_DEBUG 403 _M_is_ready = false; 404 #endif 405 return __st; 406 } 407 408 void 409 _M_add_equivalence_class(const _StringT& __s) 410 { 411 auto __st = _M_traits.lookup_collatename(__s.data(), 412 __s.data() + __s.size()); 413 if (__st.empty()) 414 __throw_regex_error(regex_constants::error_collate); 415 __st = _M_traits.transform_primary(__st.data(), 416 __st.data() + __st.size()); 417 _M_equiv_set.push_back(__st); 418 #ifdef _GLIBCXX_DEBUG 419 _M_is_ready = false; 420 #endif 421 } 422 423 // __neg should be true for \D, \S and \W only. 424 void 425 _M_add_character_class(const _StringT& __s, bool __neg) 426 { 427 auto __mask = _M_traits.lookup_classname(__s.data(), 428 __s.data() + __s.size(), 429 __icase); 430 if (__mask == 0) 431 __throw_regex_error(regex_constants::error_ctype); 432 if (!__neg) 433 _M_class_set |= __mask; 434 else 435 _M_neg_class_set.push_back(__mask); 436 #ifdef _GLIBCXX_DEBUG 437 _M_is_ready = false; 438 #endif 439 } 440 441 void 442 _M_make_range(_CharT __l, _CharT __r) 443 { 444 if (__l > __r) 445 __throw_regex_error(regex_constants::error_range); 446 _M_range_set.push_back(make_pair(_M_translator._M_transform(__l), 447 _M_translator._M_transform(__r))); 448 #ifdef _GLIBCXX_DEBUG 449 _M_is_ready = false; 450 #endif 451 } 452 453 void 454 _M_ready() 455 { 456 std::sort(_M_char_set.begin(), _M_char_set.end()); 457 auto __end = std::unique(_M_char_set.begin(), _M_char_set.end()); 458 _M_char_set.erase(__end, _M_char_set.end()); 459 _M_make_cache(_UseCache()); 460 #ifdef _GLIBCXX_DEBUG 461 _M_is_ready = true; 462 #endif 463 } 464 465 private: 466 // Currently we only use the cache for char 467 typedef typename std::is_same<_CharT, char>::type _UseCache; 468 469 static constexpr size_t 470 _S_cache_size() 471 { 472 return 1ul << (sizeof(_CharT) * __CHAR_BIT__ * int(_UseCache::value)); 473 } 474 475 struct _Dummy { }; 476 typedef typename std::conditional<_UseCache::value, 477 std::bitset<_S_cache_size()>, 478 _Dummy>::type _CacheT; 479 typedef typename std::make_unsigned<_CharT>::type _UnsignedCharT; 480 481 bool 482 _M_apply(_CharT __ch, false_type) const; 483 484 bool 485 _M_apply(_CharT __ch, true_type) const 486 { return _M_cache[static_cast<_UnsignedCharT>(__ch)]; } 487 488 void 489 _M_make_cache(true_type) 490 { 491 for (unsigned __i = 0; __i < _M_cache.size(); __i++) 492 _M_cache[__i] = _M_apply(static_cast<_CharT>(__i), false_type()); 493 } 494 495 void 496 _M_make_cache(false_type) 497 { } 498 499 private: 500 std::vector<_CharT> _M_char_set; 501 std::vector<_StringT> _M_equiv_set; 502 std::vector<pair<_StrTransT, _StrTransT>> _M_range_set; 503 std::vector<_CharClassT> _M_neg_class_set; 504 _CharClassT _M_class_set; 505 _TransT _M_translator; 506 const _TraitsT& _M_traits; 507 bool _M_is_non_matching; 508 _CacheT _M_cache; 509 #ifdef _GLIBCXX_DEBUG 510 bool _M_is_ready; 511 #endif 512 }; 513 514 //@} regex-detail 515 _GLIBCXX_END_NAMESPACE_VERSION 516 } // namespace __detail 517 } // namespace std 518 519 #include <bits/regex_compiler.tcc> 520