1 // class template regex -*- C++ -*- 2 3 // Copyright (C) 2010-2013 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 /// Base class for scanner. 43 struct _Scanner_base 44 { 45 typedef unsigned int _StateT; 46 47 static constexpr _StateT _S_state_at_start = 1 << 0; 48 static constexpr _StateT _S_state_in_brace = 1 << 2; 49 static constexpr _StateT _S_state_in_bracket = 1 << 3; 50 51 virtual ~_Scanner_base() { }; 52 }; 53 54 /** 55 * @brief struct _Scanner. Scans an input range for regex tokens. 56 * 57 * The %_Scanner class interprets the regular expression pattern in 58 * the input range passed to its constructor as a sequence of parse 59 * tokens passed to the regular expression compiler. The sequence 60 * of tokens provided depends on the flag settings passed to the 61 * constructor: different regular expression grammars will interpret 62 * the same input pattern in syntactically different ways. 63 */ 64 template<typename _InputIterator> 65 class _Scanner: public _Scanner_base 66 { 67 public: 68 typedef _InputIterator _IteratorT; 69 typedef typename std::iterator_traits<_IteratorT>::value_type _CharT; 70 typedef std::basic_string<_CharT> _StringT; 71 typedef regex_constants::syntax_option_type _FlagT; 72 typedef const std::ctype<_CharT> _CtypeT; 73 74 /// Token types returned from the scanner. 75 enum _TokenT 76 { 77 _S_token_anychar, 78 _S_token_backref, 79 _S_token_bracket_begin, 80 _S_token_bracket_end, 81 _S_token_inverse_class, 82 _S_token_char_class_name, 83 _S_token_closure0, 84 _S_token_closure1, 85 _S_token_collelem_multi, 86 _S_token_collelem_single, 87 _S_token_collsymbol, 88 _S_token_comma, 89 _S_token_dash, 90 _S_token_dup_count, 91 _S_token_eof, 92 _S_token_equiv_class_name, 93 _S_token_interval_begin, 94 _S_token_interval_end, 95 _S_token_line_begin, 96 _S_token_line_end, 97 _S_token_opt, 98 _S_token_or, 99 _S_token_ord_char, 100 _S_token_quoted_char, 101 _S_token_subexpr_begin, 102 _S_token_subexpr_end, 103 _S_token_word_begin, 104 _S_token_word_end, 105 _S_token_unknown 106 }; 107 108 _Scanner(_IteratorT __begin, _IteratorT __end, _FlagT __flags, 109 std::locale __loc) 110 : _M_current(__begin) , _M_end(__end) , _M_flags(__flags), 111 _M_ctype(std::use_facet<_CtypeT>(__loc)), _M_state(_S_state_at_start) 112 { _M_advance(); } 113 114 void 115 _M_advance(); 116 117 _TokenT 118 _M_token() const 119 { return _M_curToken; } 120 121 const _StringT& 122 _M_value() const 123 { return _M_curValue; } 124 125 #ifdef _GLIBCXX_DEBUG 126 std::ostream& 127 _M_print(std::ostream&); 128 #endif 129 130 private: 131 void 132 _M_eat_escape(); 133 134 void 135 _M_scan_in_brace(); 136 137 void 138 _M_scan_in_bracket(); 139 140 void 141 _M_eat_charclass(); 142 143 void 144 _M_eat_equivclass(); 145 146 void 147 _M_eat_collsymbol(); 148 149 _IteratorT _M_current; 150 _IteratorT _M_end; 151 _FlagT _M_flags; 152 _CtypeT& _M_ctype; 153 _TokenT _M_curToken; 154 _StringT _M_curValue; 155 _StateT _M_state; 156 }; 157 158 template<typename _InputIterator> 159 void 160 _Scanner<_InputIterator>:: 161 _M_advance() 162 { 163 if (_M_current == _M_end) 164 { 165 _M_curToken = _S_token_eof; 166 return; 167 } 168 169 _CharT __c = *_M_current; 170 if (_M_state & _S_state_in_bracket) 171 { 172 _M_scan_in_bracket(); 173 return; 174 } 175 if (_M_state & _S_state_in_brace) 176 { 177 _M_scan_in_brace(); 178 return; 179 } 180 #if 0 181 // TODO: re-enable line anchors when _M_assertion is implemented. 182 // See PR libstdc++/47724 183 else if (_M_state & _S_state_at_start && __c == _M_ctype.widen('^')) 184 { 185 _M_curToken = _S_token_line_begin; 186 ++_M_current; 187 return; 188 } 189 else if (__c == _M_ctype.widen('$')) 190 { 191 _M_curToken = _S_token_line_end; 192 ++_M_current; 193 return; 194 } 195 #endif 196 else if (__c == _M_ctype.widen('.')) 197 { 198 _M_curToken = _S_token_anychar; 199 ++_M_current; 200 return; 201 } 202 else if (__c == _M_ctype.widen('*')) 203 { 204 _M_curToken = _S_token_closure0; 205 ++_M_current; 206 return; 207 } 208 else if (__c == _M_ctype.widen('+')) 209 { 210 _M_curToken = _S_token_closure1; 211 ++_M_current; 212 return; 213 } 214 else if (__c == _M_ctype.widen('|')) 215 { 216 _M_curToken = _S_token_or; 217 ++_M_current; 218 return; 219 } 220 else if (__c == _M_ctype.widen('[')) 221 { 222 _M_curToken = _S_token_bracket_begin; 223 _M_state |= (_S_state_in_bracket | _S_state_at_start); 224 ++_M_current; 225 return; 226 } 227 else if (__c == _M_ctype.widen('\\')) 228 { 229 _M_eat_escape(); 230 return; 231 } 232 else if (!(_M_flags & (regex_constants::basic | regex_constants::grep))) 233 { 234 if (__c == _M_ctype.widen('(')) 235 { 236 _M_curToken = _S_token_subexpr_begin; 237 ++_M_current; 238 return; 239 } 240 else if (__c == _M_ctype.widen(')')) 241 { 242 _M_curToken = _S_token_subexpr_end; 243 ++_M_current; 244 return; 245 } 246 else if (__c == _M_ctype.widen('{')) 247 { 248 _M_curToken = _S_token_interval_begin; 249 _M_state |= _S_state_in_brace; 250 ++_M_current; 251 return; 252 } 253 } 254 255 _M_curToken = _S_token_ord_char; 256 _M_curValue.assign(1, __c); 257 ++_M_current; 258 } 259 260 261 template<typename _InputIterator> 262 void 263 _Scanner<_InputIterator>:: 264 _M_scan_in_brace() 265 { 266 if (_M_ctype.is(_CtypeT::digit, *_M_current)) 267 { 268 _M_curToken = _S_token_dup_count; 269 _M_curValue.assign(1, *_M_current); 270 ++_M_current; 271 while (_M_current != _M_end 272 && _M_ctype.is(_CtypeT::digit, *_M_current)) 273 { 274 _M_curValue += *_M_current; 275 ++_M_current; 276 } 277 return; 278 } 279 else if (*_M_current == _M_ctype.widen(',')) 280 { 281 _M_curToken = _S_token_comma; 282 ++_M_current; 283 return; 284 } 285 if (_M_flags & (regex_constants::basic | regex_constants::grep)) 286 { 287 if (*_M_current == _M_ctype.widen('\\')) 288 _M_eat_escape(); 289 } 290 else 291 { 292 if (*_M_current == _M_ctype.widen('}')) 293 { 294 _M_curToken = _S_token_interval_end; 295 _M_state &= ~_S_state_in_brace; 296 ++_M_current; 297 return; 298 } 299 } 300 } 301 302 template<typename _InputIterator> 303 void 304 _Scanner<_InputIterator>:: 305 _M_scan_in_bracket() 306 { 307 if (_M_state & _S_state_at_start && *_M_current == _M_ctype.widen('^')) 308 { 309 _M_curToken = _S_token_inverse_class; 310 _M_state &= ~_S_state_at_start; 311 ++_M_current; 312 return; 313 } 314 else if (*_M_current == _M_ctype.widen('[')) 315 { 316 ++_M_current; 317 if (_M_current == _M_end) 318 { 319 _M_curToken = _S_token_eof; 320 return; 321 } 322 323 if (*_M_current == _M_ctype.widen('.')) 324 { 325 _M_curToken = _S_token_collsymbol; 326 _M_eat_collsymbol(); 327 return; 328 } 329 else if (*_M_current == _M_ctype.widen(':')) 330 { 331 _M_curToken = _S_token_char_class_name; 332 _M_eat_charclass(); 333 return; 334 } 335 else if (*_M_current == _M_ctype.widen('=')) 336 { 337 _M_curToken = _S_token_equiv_class_name; 338 _M_eat_equivclass(); 339 return; 340 } 341 } 342 else if (*_M_current == _M_ctype.widen('-')) 343 { 344 _M_curToken = _S_token_dash; 345 ++_M_current; 346 return; 347 } 348 else if (*_M_current == _M_ctype.widen(']')) 349 { 350 if (!(_M_flags & regex_constants::ECMAScript) 351 || !(_M_state & _S_state_at_start)) 352 { 353 // special case: only if _not_ chr first after 354 // '[' or '[^' and if not ECMAscript 355 _M_curToken = _S_token_bracket_end; 356 ++_M_current; 357 return; 358 } 359 } 360 _M_curToken = _S_token_collelem_single; 361 _M_curValue.assign(1, *_M_current); 362 ++_M_current; 363 } 364 365 template<typename _InputIterator> 366 void 367 _Scanner<_InputIterator>:: 368 _M_eat_escape() 369 { 370 ++_M_current; 371 if (_M_current == _M_end) 372 { 373 _M_curToken = _S_token_eof; 374 return; 375 } 376 _CharT __c = *_M_current; 377 ++_M_current; 378 379 if (__c == _M_ctype.widen('(')) 380 { 381 if (!(_M_flags & (regex_constants::basic | regex_constants::grep))) 382 { 383 _M_curToken = _S_token_ord_char; 384 _M_curValue.assign(1, __c); 385 } 386 else 387 _M_curToken = _S_token_subexpr_begin; 388 } 389 else if (__c == _M_ctype.widen(')')) 390 { 391 if (!(_M_flags & (regex_constants::basic | regex_constants::grep))) 392 { 393 _M_curToken = _S_token_ord_char; 394 _M_curValue.assign(1, __c); 395 } 396 else 397 _M_curToken = _S_token_subexpr_end; 398 } 399 else if (__c == _M_ctype.widen('{')) 400 { 401 if (!(_M_flags & (regex_constants::basic | regex_constants::grep))) 402 { 403 _M_curToken = _S_token_ord_char; 404 _M_curValue.assign(1, __c); 405 } 406 else 407 { 408 _M_curToken = _S_token_interval_begin; 409 _M_state |= _S_state_in_brace; 410 } 411 } 412 else if (__c == _M_ctype.widen('}')) 413 { 414 if (!(_M_flags & (regex_constants::basic | regex_constants::grep))) 415 { 416 _M_curToken = _S_token_ord_char; 417 _M_curValue.assign(1, __c); 418 } 419 else 420 { 421 if (!(_M_state && _S_state_in_brace)) 422 __throw_regex_error(regex_constants::error_badbrace); 423 _M_state &= ~_S_state_in_brace; 424 _M_curToken = _S_token_interval_end; 425 } 426 } 427 else if (__c == _M_ctype.widen('x')) 428 { 429 ++_M_current; 430 if (_M_current == _M_end) 431 { 432 _M_curToken = _S_token_eof; 433 return; 434 } 435 if (_M_ctype.is(_CtypeT::digit, *_M_current)) 436 { 437 _M_curValue.assign(1, *_M_current); 438 ++_M_current; 439 if (_M_current == _M_end) 440 { 441 _M_curToken = _S_token_eof; 442 return; 443 } 444 if (_M_ctype.is(_CtypeT::digit, *_M_current)) 445 { 446 _M_curValue += *_M_current; 447 ++_M_current; 448 return; 449 } 450 } 451 } 452 else if (__c == _M_ctype.widen('^') 453 || __c == _M_ctype.widen('.') 454 || __c == _M_ctype.widen('*') 455 || __c == _M_ctype.widen('$') 456 || __c == _M_ctype.widen('\\')) 457 { 458 _M_curToken = _S_token_ord_char; 459 _M_curValue.assign(1, __c); 460 } 461 else if (_M_ctype.is(_CtypeT::digit, __c)) 462 { 463 _M_curToken = _S_token_backref; 464 _M_curValue.assign(1, __c); 465 } 466 else 467 __throw_regex_error(regex_constants::error_escape); 468 } 469 470 471 // Eats a character class or throwns an exception. 472 // current point to ':' delimiter on entry, char after ']' on return 473 template<typename _InputIterator> 474 void 475 _Scanner<_InputIterator>:: 476 _M_eat_charclass() 477 { 478 ++_M_current; // skip ':' 479 if (_M_current == _M_end) 480 __throw_regex_error(regex_constants::error_ctype); 481 for (_M_curValue.clear(); 482 _M_current != _M_end && *_M_current != _M_ctype.widen(':'); 483 ++_M_current) 484 _M_curValue += *_M_current; 485 if (_M_current == _M_end) 486 __throw_regex_error(regex_constants::error_ctype); 487 ++_M_current; // skip ':' 488 if (*_M_current != _M_ctype.widen(']')) 489 __throw_regex_error(regex_constants::error_ctype); 490 ++_M_current; // skip ']' 491 } 492 493 494 template<typename _InputIterator> 495 void 496 _Scanner<_InputIterator>:: 497 _M_eat_equivclass() 498 { 499 ++_M_current; // skip '=' 500 if (_M_current == _M_end) 501 __throw_regex_error(regex_constants::error_collate); 502 for (_M_curValue.clear(); 503 _M_current != _M_end && *_M_current != _M_ctype.widen('='); 504 ++_M_current) 505 _M_curValue += *_M_current; 506 if (_M_current == _M_end) 507 __throw_regex_error(regex_constants::error_collate); 508 ++_M_current; // skip '=' 509 if (*_M_current != _M_ctype.widen(']')) 510 __throw_regex_error(regex_constants::error_collate); 511 ++_M_current; // skip ']' 512 } 513 514 515 template<typename _InputIterator> 516 void 517 _Scanner<_InputIterator>:: 518 _M_eat_collsymbol() 519 { 520 ++_M_current; // skip '.' 521 if (_M_current == _M_end) 522 __throw_regex_error(regex_constants::error_collate); 523 for (_M_curValue.clear(); 524 _M_current != _M_end && *_M_current != _M_ctype.widen('.'); 525 ++_M_current) 526 _M_curValue += *_M_current; 527 if (_M_current == _M_end) 528 __throw_regex_error(regex_constants::error_collate); 529 ++_M_current; // skip '.' 530 if (*_M_current != _M_ctype.widen(']')) 531 __throw_regex_error(regex_constants::error_collate); 532 ++_M_current; // skip ']' 533 } 534 535 #ifdef _GLIBCXX_DEBUG 536 template<typename _InputIterator> 537 std::ostream& 538 _Scanner<_InputIterator>:: 539 _M_print(std::ostream& ostr) 540 { 541 switch (_M_curToken) 542 { 543 case _S_token_anychar: 544 ostr << "any-character\n"; 545 break; 546 case _S_token_backref: 547 ostr << "backref\n"; 548 break; 549 case _S_token_bracket_begin: 550 ostr << "bracket-begin\n"; 551 break; 552 case _S_token_bracket_end: 553 ostr << "bracket-end\n"; 554 break; 555 case _S_token_char_class_name: 556 ostr << "char-class-name \"" << _M_curValue << "\"\n"; 557 break; 558 case _S_token_closure0: 559 ostr << "closure0\n"; 560 break; 561 case _S_token_closure1: 562 ostr << "closure1\n"; 563 break; 564 case _S_token_collelem_multi: 565 ostr << "coll-elem-multi \"" << _M_curValue << "\"\n"; 566 break; 567 case _S_token_collelem_single: 568 ostr << "coll-elem-single \"" << _M_curValue << "\"\n"; 569 break; 570 case _S_token_collsymbol: 571 ostr << "collsymbol \"" << _M_curValue << "\"\n"; 572 break; 573 case _S_token_comma: 574 ostr << "comma\n"; 575 break; 576 case _S_token_dash: 577 ostr << "dash\n"; 578 break; 579 case _S_token_dup_count: 580 ostr << "dup count: " << _M_curValue << "\n"; 581 break; 582 case _S_token_eof: 583 ostr << "EOF\n"; 584 break; 585 case _S_token_equiv_class_name: 586 ostr << "equiv-class-name \"" << _M_curValue << "\"\n"; 587 break; 588 case _S_token_interval_begin: 589 ostr << "interval begin\n"; 590 break; 591 case _S_token_interval_end: 592 ostr << "interval end\n"; 593 break; 594 case _S_token_line_begin: 595 ostr << "line begin\n"; 596 break; 597 case _S_token_line_end: 598 ostr << "line end\n"; 599 break; 600 case _S_token_opt: 601 ostr << "opt\n"; 602 break; 603 case _S_token_or: 604 ostr << "or\n"; 605 break; 606 case _S_token_ord_char: 607 ostr << "ordinary character: \"" << _M_value() << "\"\n"; 608 break; 609 case _S_token_quoted_char: 610 ostr << "quoted char\n"; 611 break; 612 case _S_token_subexpr_begin: 613 ostr << "subexpr begin\n"; 614 break; 615 case _S_token_subexpr_end: 616 ostr << "subexpr end\n"; 617 break; 618 case _S_token_word_begin: 619 ostr << "word begin\n"; 620 break; 621 case _S_token_word_end: 622 ostr << "word end\n"; 623 break; 624 case _S_token_unknown: 625 ostr << "-- unknown token --\n"; 626 break; 627 } 628 return ostr; 629 } 630 #endif 631 632 /// Builds an NFA from an input iterator interval. 633 template<typename _InIter, typename _TraitsT> 634 class _Compiler 635 { 636 public: 637 typedef _InIter _IterT; 638 typedef typename std::iterator_traits<_InIter>::value_type _CharT; 639 typedef std::basic_string<_CharT> _StringT; 640 typedef regex_constants::syntax_option_type _FlagT; 641 642 _Compiler(const _InIter& __b, const _InIter& __e, 643 _TraitsT& __traits, _FlagT __flags); 644 645 const _Nfa& 646 _M_nfa() const 647 { return _M_state_store; } 648 649 private: 650 typedef _Scanner<_InIter> _ScannerT; 651 typedef typename _ScannerT::_TokenT _TokenT; 652 typedef std::stack<_StateSeq, std::vector<_StateSeq> > _StackT; 653 typedef _RangeMatcher<_InIter, _TraitsT> _RMatcherT; 654 655 // accepts a specific token or returns false. 656 bool 657 _M_match_token(_TokenT __token); 658 659 void 660 _M_disjunction(); 661 662 bool 663 _M_alternative(); 664 665 bool 666 _M_term(); 667 668 bool 669 _M_assertion(); 670 671 bool 672 _M_quantifier(); 673 674 bool 675 _M_atom(); 676 677 bool 678 _M_bracket_expression(); 679 680 bool 681 _M_bracket_list(_RMatcherT& __matcher); 682 683 bool 684 _M_follow_list(_RMatcherT& __matcher); 685 686 bool 687 _M_follow_list2(_RMatcherT& __matcher); 688 689 bool 690 _M_expression_term(_RMatcherT& __matcher); 691 692 bool 693 _M_range_expression(_RMatcherT& __matcher); 694 695 bool 696 _M_start_range(_RMatcherT& __matcher); 697 698 bool 699 _M_collating_symbol(_RMatcherT& __matcher); 700 701 bool 702 _M_equivalence_class(_RMatcherT& __matcher); 703 704 bool 705 _M_character_class(_RMatcherT& __matcher); 706 707 int 708 _M_cur_int_value(int __radix); 709 710 _TraitsT& _M_traits; 711 _ScannerT _M_scanner; 712 _StringT _M_cur_value; 713 _Nfa _M_state_store; 714 _StackT _M_stack; 715 }; 716 717 template<typename _InIter, typename _TraitsT> 718 _Compiler<_InIter, _TraitsT>:: 719 _Compiler(const _InIter& __b, const _InIter& __e, _TraitsT& __traits, 720 _Compiler<_InIter, _TraitsT>::_FlagT __flags) 721 : _M_traits(__traits), _M_scanner(__b, __e, __flags, _M_traits.getloc()), 722 _M_state_store(__flags) 723 { 724 typedef _StartTagger<_InIter, _TraitsT> _Start; 725 typedef _EndTagger<_InIter, _TraitsT> _End; 726 727 _StateSeq __r(_M_state_store, 728 _M_state_store._M_insert_subexpr_begin(_Start(0))); 729 _M_disjunction(); 730 if (!_M_stack.empty()) 731 { 732 __r._M_append(_M_stack.top()); 733 _M_stack.pop(); 734 } 735 __r._M_append(_M_state_store._M_insert_subexpr_end(0, _End(0))); 736 __r._M_append(_M_state_store._M_insert_accept()); 737 } 738 739 template<typename _InIter, typename _TraitsT> 740 bool 741 _Compiler<_InIter, _TraitsT>:: 742 _M_match_token(_Compiler<_InIter, _TraitsT>::_TokenT token) 743 { 744 if (token == _M_scanner._M_token()) 745 { 746 _M_cur_value = _M_scanner._M_value(); 747 _M_scanner._M_advance(); 748 return true; 749 } 750 return false; 751 } 752 753 template<typename _InIter, typename _TraitsT> 754 void 755 _Compiler<_InIter, _TraitsT>:: 756 _M_disjunction() 757 { 758 this->_M_alternative(); 759 if (_M_match_token(_ScannerT::_S_token_or)) 760 { 761 _StateSeq __alt1 = _M_stack.top(); _M_stack.pop(); 762 this->_M_disjunction(); 763 _StateSeq __alt2 = _M_stack.top(); _M_stack.pop(); 764 _M_stack.push(_StateSeq(__alt1, __alt2)); 765 } 766 } 767 768 template<typename _InIter, typename _TraitsT> 769 bool 770 _Compiler<_InIter, _TraitsT>:: 771 _M_alternative() 772 { 773 if (this->_M_term()) 774 { 775 _StateSeq __re = _M_stack.top(); _M_stack.pop(); 776 this->_M_alternative(); 777 if (!_M_stack.empty()) 778 { 779 __re._M_append(_M_stack.top()); 780 _M_stack.pop(); 781 } 782 _M_stack.push(__re); 783 return true; 784 } 785 return false; 786 } 787 788 template<typename _InIter, typename _TraitsT> 789 bool 790 _Compiler<_InIter, _TraitsT>:: 791 _M_term() 792 { 793 if (this->_M_assertion()) 794 return true; 795 if (this->_M_atom()) 796 { 797 this->_M_quantifier(); 798 return true; 799 } 800 return false; 801 } 802 803 template<typename _InIter, typename _TraitsT> 804 bool 805 _Compiler<_InIter, _TraitsT>:: 806 _M_assertion() 807 { 808 if (_M_match_token(_ScannerT::_S_token_line_begin)) 809 { 810 // __m.push(_Matcher::_S_opcode_line_begin); 811 return true; 812 } 813 if (_M_match_token(_ScannerT::_S_token_line_end)) 814 { 815 // __m.push(_Matcher::_S_opcode_line_end); 816 return true; 817 } 818 if (_M_match_token(_ScannerT::_S_token_word_begin)) 819 { 820 // __m.push(_Matcher::_S_opcode_word_begin); 821 return true; 822 } 823 if (_M_match_token(_ScannerT::_S_token_word_end)) 824 { 825 // __m.push(_Matcher::_S_opcode_word_end); 826 return true; 827 } 828 return false; 829 } 830 831 template<typename _InIter, typename _TraitsT> 832 bool 833 _Compiler<_InIter, _TraitsT>:: 834 _M_quantifier() 835 { 836 if (_M_match_token(_ScannerT::_S_token_closure0)) 837 { 838 if (_M_stack.empty()) 839 __throw_regex_error(regex_constants::error_badrepeat); 840 _StateSeq __r(_M_stack.top(), -1); 841 __r._M_append(__r._M_front()); 842 _M_stack.pop(); 843 _M_stack.push(__r); 844 return true; 845 } 846 if (_M_match_token(_ScannerT::_S_token_closure1)) 847 { 848 if (_M_stack.empty()) 849 __throw_regex_error(regex_constants::error_badrepeat); 850 _StateSeq __r(_M_state_store, 851 _M_state_store. 852 _M_insert_alt(_S_invalid_state_id, 853 _M_stack.top()._M_front())); 854 _M_stack.top()._M_append(__r); 855 return true; 856 } 857 if (_M_match_token(_ScannerT::_S_token_opt)) 858 { 859 if (_M_stack.empty()) 860 __throw_regex_error(regex_constants::error_badrepeat); 861 _StateSeq __r(_M_stack.top(), -1); 862 _M_stack.pop(); 863 _M_stack.push(__r); 864 return true; 865 } 866 if (_M_match_token(_ScannerT::_S_token_interval_begin)) 867 { 868 if (_M_stack.empty()) 869 __throw_regex_error(regex_constants::error_badrepeat); 870 if (!_M_match_token(_ScannerT::_S_token_dup_count)) 871 __throw_regex_error(regex_constants::error_badbrace); 872 _StateSeq __r(_M_stack.top()); 873 int __min_rep = _M_cur_int_value(10); 874 for (int __i = 1; __i < __min_rep; ++__i) 875 _M_stack.top()._M_append(__r._M_clone()); 876 if (_M_match_token(_ScannerT::_S_token_comma)) 877 if (_M_match_token(_ScannerT::_S_token_dup_count)) 878 { 879 int __n = _M_cur_int_value(10) - __min_rep; 880 if (__n < 0) 881 __throw_regex_error(regex_constants::error_badbrace); 882 for (int __i = 0; __i < __n; ++__i) 883 { 884 _StateSeq __r(_M_state_store, 885 _M_state_store. 886 _M_insert_alt(_S_invalid_state_id, 887 _M_stack.top()._M_front())); 888 _M_stack.top()._M_append(__r); 889 } 890 } 891 else 892 { 893 _StateSeq __r(_M_stack.top(), -1); 894 __r._M_push_back(__r._M_front()); 895 _M_stack.pop(); 896 _M_stack.push(__r); 897 } 898 if (!_M_match_token(_ScannerT::_S_token_interval_end)) 899 __throw_regex_error(regex_constants::error_brace); 900 return true; 901 } 902 return false; 903 } 904 905 template<typename _InIter, typename _TraitsT> 906 bool 907 _Compiler<_InIter, _TraitsT>:: 908 _M_atom() 909 { 910 typedef _CharMatcher<_InIter, _TraitsT> _CMatcher; 911 typedef _StartTagger<_InIter, _TraitsT> _Start; 912 typedef _EndTagger<_InIter, _TraitsT> _End; 913 914 if (_M_match_token(_ScannerT::_S_token_anychar)) 915 { 916 _M_stack.push(_StateSeq(_M_state_store, 917 _M_state_store._M_insert_matcher 918 (_AnyMatcher))); 919 return true; 920 } 921 if (_M_match_token(_ScannerT::_S_token_ord_char)) 922 { 923 _M_stack.push(_StateSeq(_M_state_store, 924 _M_state_store._M_insert_matcher 925 (_CMatcher(_M_cur_value[0], _M_traits)))); 926 return true; 927 } 928 if (_M_match_token(_ScannerT::_S_token_quoted_char)) 929 { 930 // note that in the ECMA grammar, this case covers backrefs. 931 _M_stack.push(_StateSeq(_M_state_store, 932 _M_state_store._M_insert_matcher 933 (_CMatcher(_M_cur_value[0], _M_traits)))); 934 return true; 935 } 936 if (_M_match_token(_ScannerT::_S_token_backref)) 937 { 938 // __m.push(_Matcher::_S_opcode_ordchar, _M_cur_value); 939 return true; 940 } 941 if (_M_match_token(_ScannerT::_S_token_subexpr_begin)) 942 { 943 int __mark = _M_state_store._M_sub_count(); 944 _StateSeq __r(_M_state_store, 945 _M_state_store. 946 _M_insert_subexpr_begin(_Start(__mark))); 947 this->_M_disjunction(); 948 if (!_M_match_token(_ScannerT::_S_token_subexpr_end)) 949 __throw_regex_error(regex_constants::error_paren); 950 if (!_M_stack.empty()) 951 { 952 __r._M_append(_M_stack.top()); 953 _M_stack.pop(); 954 } 955 __r._M_append(_M_state_store._M_insert_subexpr_end 956 (__mark, _End(__mark))); 957 _M_stack.push(__r); 958 return true; 959 } 960 return _M_bracket_expression(); 961 } 962 963 template<typename _InIter, typename _TraitsT> 964 bool 965 _Compiler<_InIter, _TraitsT>:: 966 _M_bracket_expression() 967 { 968 if (_M_match_token(_ScannerT::_S_token_bracket_begin)) 969 { 970 _RMatcherT __matcher(_M_match_token(_ScannerT::_S_token_line_begin), 971 _M_traits); 972 if (!_M_bracket_list(__matcher) 973 || !_M_match_token(_ScannerT::_S_token_bracket_end)) 974 __throw_regex_error(regex_constants::error_brack); 975 _M_stack.push(_StateSeq(_M_state_store, 976 _M_state_store._M_insert_matcher(__matcher))); 977 return true; 978 } 979 return false; 980 } 981 982 // If the dash is the last character in the bracket expression, it is not 983 // special. 984 template<typename _InIter, typename _TraitsT> 985 bool 986 _Compiler<_InIter, _TraitsT>:: 987 _M_bracket_list(_RMatcherT& __matcher) 988 { 989 if (_M_follow_list(__matcher)) 990 { 991 if (_M_match_token(_ScannerT::_S_token_dash)) 992 __matcher._M_add_char(_M_cur_value[0]); 993 return true; 994 } 995 return false; 996 } 997 998 template<typename _InIter, typename _TraitsT> 999 bool 1000 _Compiler<_InIter, _TraitsT>:: 1001 _M_follow_list(_RMatcherT& __matcher) 1002 { return _M_expression_term(__matcher) && _M_follow_list2(__matcher); } 1003 1004 template<typename _InIter, typename _TraitsT> 1005 bool 1006 _Compiler<_InIter, _TraitsT>:: 1007 _M_follow_list2(_RMatcherT& __matcher) 1008 { 1009 if (_M_expression_term(__matcher)) 1010 return _M_follow_list2(__matcher); 1011 return true; 1012 } 1013 1014 template<typename _InIter, typename _TraitsT> 1015 bool 1016 _Compiler<_InIter, _TraitsT>:: 1017 _M_expression_term(_RMatcherT& __matcher) 1018 { 1019 return (_M_collating_symbol(__matcher) 1020 || _M_character_class(__matcher) 1021 || _M_equivalence_class(__matcher) 1022 || (_M_start_range(__matcher) 1023 && _M_range_expression(__matcher))); 1024 } 1025 1026 template<typename _InIter, typename _TraitsT> 1027 bool 1028 _Compiler<_InIter, _TraitsT>:: 1029 _M_range_expression(_RMatcherT& __matcher) 1030 { 1031 if (!_M_collating_symbol(__matcher)) 1032 if (!_M_match_token(_ScannerT::_S_token_dash)) 1033 __throw_regex_error(regex_constants::error_range); 1034 __matcher._M_make_range(); 1035 return true; 1036 } 1037 1038 template<typename _InIter, typename _TraitsT> 1039 bool 1040 _Compiler<_InIter, _TraitsT>:: 1041 _M_start_range(_RMatcherT& __matcher) 1042 { return _M_match_token(_ScannerT::_S_token_dash); } 1043 1044 template<typename _InIter, typename _TraitsT> 1045 bool 1046 _Compiler<_InIter, _TraitsT>:: 1047 _M_collating_symbol(_RMatcherT& __matcher) 1048 { 1049 if (_M_match_token(_ScannerT::_S_token_collelem_single)) 1050 { 1051 __matcher._M_add_char(_M_cur_value[0]); 1052 return true; 1053 } 1054 if (_M_match_token(_ScannerT::_S_token_collsymbol)) 1055 { 1056 __matcher._M_add_collating_element(_M_cur_value); 1057 return true; 1058 } 1059 return false; 1060 } 1061 1062 template<typename _InIter, typename _TraitsT> 1063 bool 1064 _Compiler<_InIter, _TraitsT>:: 1065 _M_equivalence_class(_RMatcherT& __matcher) 1066 { 1067 if (_M_match_token(_ScannerT::_S_token_equiv_class_name)) 1068 { 1069 __matcher._M_add_equivalence_class(_M_cur_value); 1070 return true; 1071 } 1072 return false; 1073 } 1074 1075 template<typename _InIter, typename _TraitsT> 1076 bool 1077 _Compiler<_InIter, _TraitsT>:: 1078 _M_character_class(_RMatcherT& __matcher) 1079 { 1080 if (_M_match_token(_ScannerT::_S_token_char_class_name)) 1081 { 1082 __matcher._M_add_character_class(_M_cur_value); 1083 return true; 1084 } 1085 return false; 1086 } 1087 1088 template<typename _InIter, typename _TraitsT> 1089 int 1090 _Compiler<_InIter, _TraitsT>:: 1091 _M_cur_int_value(int __radix) 1092 { 1093 int __v = 0; 1094 for (typename _StringT::size_type __i = 0; 1095 __i < _M_cur_value.length(); ++__i) 1096 __v =__v * __radix + _M_traits.value(_M_cur_value[__i], __radix); 1097 return __v; 1098 } 1099 1100 template<typename _InIter, typename _TraitsT> 1101 _AutomatonPtr 1102 __compile(const _InIter& __b, const _InIter& __e, _TraitsT& __t, 1103 regex_constants::syntax_option_type __f) 1104 { return _AutomatonPtr(new _Nfa(_Compiler<_InIter, _TraitsT>(__b, __e, __t, 1105 __f)._M_nfa())); } 1106 1107 //@} regex-detail 1108 _GLIBCXX_END_NAMESPACE_VERSION 1109 } // namespace __detail 1110 } // namespace std 1111
