libstdc++
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00001 // class template regex -*- C++ -*- 00002 00003 // Copyright (C) 2010-2014 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** 00026 * @file bits/regex_compiler.h 00027 * This is an internal header file, included by other library headers. 00028 * Do not attempt to use it directly. @headername{regex} 00029 */ 00030 00031 namespace std _GLIBCXX_VISIBILITY(default) 00032 { 00033 namespace __detail 00034 { 00035 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00036 00037 /** 00038 * @addtogroup regex-detail 00039 * @{ 00040 */ 00041 00042 template<typename, bool, bool> 00043 struct _BracketMatcher; 00044 00045 /** 00046 * @brief Builds an NFA from an input iterator interval. 00047 * 00048 * The %_TraitsT type should fulfill requirements [28.3]. 00049 */ 00050 template<typename _TraitsT> 00051 class _Compiler 00052 { 00053 public: 00054 typedef typename _TraitsT::char_type _CharT; 00055 typedef const _CharT* _IterT; 00056 typedef _NFA<_TraitsT> _RegexT; 00057 typedef regex_constants::syntax_option_type _FlagT; 00058 00059 _Compiler(_IterT __b, _IterT __e, 00060 const _TraitsT& __traits, _FlagT __flags); 00061 00062 std::shared_ptr<_RegexT> 00063 _M_get_nfa() 00064 { return make_shared<_RegexT>(std::move(_M_nfa)); } 00065 00066 private: 00067 typedef _Scanner<_CharT> _ScannerT; 00068 typedef typename _TraitsT::string_type _StringT; 00069 typedef typename _ScannerT::_TokenT _TokenT; 00070 typedef _StateSeq<_TraitsT> _StateSeqT; 00071 typedef std::stack<_StateSeqT> _StackT; 00072 typedef std::ctype<_CharT> _CtypeT; 00073 00074 // accepts a specific token or returns false. 00075 bool 00076 _M_match_token(_TokenT __token); 00077 00078 void 00079 _M_disjunction(); 00080 00081 void 00082 _M_alternative(); 00083 00084 bool 00085 _M_term(); 00086 00087 bool 00088 _M_assertion(); 00089 00090 bool 00091 _M_quantifier(); 00092 00093 bool 00094 _M_atom(); 00095 00096 bool 00097 _M_bracket_expression(); 00098 00099 template<bool __icase, bool __collate> 00100 void 00101 _M_insert_any_matcher_ecma(); 00102 00103 template<bool __icase, bool __collate> 00104 void 00105 _M_insert_any_matcher_posix(); 00106 00107 template<bool __icase, bool __collate> 00108 void 00109 _M_insert_char_matcher(); 00110 00111 template<bool __icase, bool __collate> 00112 void 00113 _M_insert_character_class_matcher(); 00114 00115 template<bool __icase, bool __collate> 00116 void 00117 _M_insert_bracket_matcher(bool __neg); 00118 00119 template<bool __icase, bool __collate> 00120 void 00121 _M_expression_term(_BracketMatcher<_TraitsT, __icase, __collate>& 00122 __matcher); 00123 00124 int 00125 _M_cur_int_value(int __radix); 00126 00127 bool 00128 _M_try_char(); 00129 00130 _StateSeqT 00131 _M_pop() 00132 { 00133 auto ret = _M_stack.top(); 00134 _M_stack.pop(); 00135 return ret; 00136 } 00137 00138 _FlagT _M_flags; 00139 const _TraitsT& _M_traits; 00140 const _CtypeT& _M_ctype; 00141 _ScannerT _M_scanner; 00142 _RegexT _M_nfa; 00143 _StringT _M_value; 00144 _StackT _M_stack; 00145 }; 00146 00147 template<typename _TraitsT> 00148 inline std::shared_ptr<_NFA<_TraitsT>> 00149 __compile_nfa(const typename _TraitsT::char_type* __first, 00150 const typename _TraitsT::char_type* __last, 00151 const _TraitsT& __traits, 00152 regex_constants::syntax_option_type __flags) 00153 { 00154 using _Cmplr = _Compiler<_TraitsT>; 00155 return _Cmplr(__first, __last, __traits, __flags)._M_get_nfa(); 00156 } 00157 00158 // [28.13.14] 00159 template<typename _TraitsT, bool __icase, bool __collate> 00160 class _RegexTranslator 00161 { 00162 public: 00163 typedef typename _TraitsT::char_type _CharT; 00164 typedef typename _TraitsT::string_type _StringT; 00165 typedef typename std::conditional<__collate, 00166 _StringT, 00167 _CharT>::type _StrTransT; 00168 00169 explicit 00170 _RegexTranslator(const _TraitsT& __traits) 00171 : _M_traits(__traits) 00172 { } 00173 00174 _CharT 00175 _M_translate(_CharT __ch) const 00176 { 00177 if (__icase) 00178 return _M_traits.translate_nocase(__ch); 00179 else if (__collate) 00180 return _M_traits.translate(__ch); 00181 else 00182 return __ch; 00183 } 00184 00185 _StrTransT 00186 _M_transform(_CharT __ch) const 00187 { 00188 return _M_transform_impl(__ch, typename integral_constant<bool, 00189 __collate>::type()); 00190 } 00191 00192 private: 00193 _StrTransT 00194 _M_transform_impl(_CharT __ch, false_type) const 00195 { return __ch; } 00196 00197 _StrTransT 00198 _M_transform_impl(_CharT __ch, true_type) const 00199 { 00200 _StrTransT __str = _StrTransT(1, _M_translate(__ch)); 00201 return _M_traits.transform(__str.begin(), __str.end()); 00202 } 00203 00204 const _TraitsT& _M_traits; 00205 }; 00206 00207 template<typename _TraitsT> 00208 class _RegexTranslator<_TraitsT, false, false> 00209 { 00210 public: 00211 typedef typename _TraitsT::char_type _CharT; 00212 typedef _CharT _StrTransT; 00213 00214 explicit 00215 _RegexTranslator(const _TraitsT& __traits) 00216 { } 00217 00218 _CharT 00219 _M_translate(_CharT __ch) const 00220 { return __ch; } 00221 00222 _StrTransT 00223 _M_transform(_CharT __ch) const 00224 { return __ch; } 00225 }; 00226 00227 template<typename _TraitsT, bool __is_ecma, bool __icase, bool __collate> 00228 struct _AnyMatcher; 00229 00230 template<typename _TraitsT, bool __icase, bool __collate> 00231 struct _AnyMatcher<_TraitsT, false, __icase, __collate> 00232 { 00233 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 00234 typedef typename _TransT::_CharT _CharT; 00235 00236 explicit 00237 _AnyMatcher(const _TraitsT& __traits) 00238 : _M_translator(__traits) 00239 { } 00240 00241 bool 00242 operator()(_CharT __ch) const 00243 { 00244 static auto __nul = _M_translator._M_translate('\0'); 00245 return _M_translator._M_translate(__ch) != __nul; 00246 } 00247 00248 _TransT _M_translator; 00249 }; 00250 00251 template<typename _TraitsT, bool __icase, bool __collate> 00252 struct _AnyMatcher<_TraitsT, true, __icase, __collate> 00253 { 00254 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 00255 typedef typename _TransT::_CharT _CharT; 00256 00257 explicit 00258 _AnyMatcher(const _TraitsT& __traits) 00259 : _M_translator(__traits) 00260 { } 00261 00262 bool 00263 operator()(_CharT __ch) const 00264 { return _M_apply(__ch, typename is_same<_CharT, char>::type()); } 00265 00266 bool 00267 _M_apply(_CharT __ch, true_type) const 00268 { 00269 auto __c = _M_translator._M_translate(__ch); 00270 auto __n = _M_translator._M_translate('\n'); 00271 auto __r = _M_translator._M_translate('\r'); 00272 return __c != __n && __c != __r; 00273 } 00274 00275 bool 00276 _M_apply(_CharT __ch, false_type) const 00277 { 00278 auto __c = _M_translator._M_translate(__ch); 00279 auto __n = _M_translator._M_translate('\n'); 00280 auto __r = _M_translator._M_translate('\r'); 00281 auto __u2028 = _M_translator._M_translate(u'\u2028'); 00282 auto __u2029 = _M_translator._M_translate(u'\u2029'); 00283 return __c != __n && __c != __r && __c != __u2028 && __c != __u2029; 00284 } 00285 00286 _TransT _M_translator; 00287 }; 00288 00289 template<typename _TraitsT, bool __icase, bool __collate> 00290 struct _CharMatcher 00291 { 00292 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 00293 typedef typename _TransT::_CharT _CharT; 00294 00295 _CharMatcher(_CharT __ch, const _TraitsT& __traits) 00296 : _M_translator(__traits), _M_ch(_M_translator._M_translate(__ch)) 00297 { } 00298 00299 bool 00300 operator()(_CharT __ch) const 00301 { return _M_ch == _M_translator._M_translate(__ch); } 00302 00303 _TransT _M_translator; 00304 _CharT _M_ch; 00305 }; 00306 00307 /// Matches a character range (bracket expression) 00308 template<typename _TraitsT, bool __icase, bool __collate> 00309 struct _BracketMatcher 00310 { 00311 public: 00312 typedef _RegexTranslator<_TraitsT, __icase, __collate> _TransT; 00313 typedef typename _TransT::_CharT _CharT; 00314 typedef typename _TransT::_StrTransT _StrTransT; 00315 typedef typename _TraitsT::string_type _StringT; 00316 typedef typename _TraitsT::char_class_type _CharClassT; 00317 00318 public: 00319 _BracketMatcher(bool __is_non_matching, 00320 const _TraitsT& __traits) 00321 : _M_class_set(0), _M_translator(__traits), _M_traits(__traits), 00322 _M_is_non_matching(__is_non_matching) 00323 #ifdef _GLIBCXX_DEBUG 00324 , _M_is_ready(false) 00325 #endif 00326 { } 00327 00328 bool 00329 operator()(_CharT __ch) const 00330 { 00331 _GLIBCXX_DEBUG_ASSERT(_M_is_ready); 00332 return _M_apply(__ch, _IsChar()); 00333 } 00334 00335 void 00336 _M_add_char(_CharT __c) 00337 { 00338 _M_char_set.push_back(_M_translator._M_translate(__c)); 00339 #ifdef _GLIBCXX_DEBUG 00340 _M_is_ready = false; 00341 #endif 00342 } 00343 00344 void 00345 _M_add_collating_element(const _StringT& __s) 00346 { 00347 auto __st = _M_traits.lookup_collatename(__s.data(), 00348 __s.data() + __s.size()); 00349 if (__st.empty()) 00350 __throw_regex_error(regex_constants::error_collate); 00351 _M_char_set.push_back(_M_translator._M_translate(__st[0])); 00352 #ifdef _GLIBCXX_DEBUG 00353 _M_is_ready = false; 00354 #endif 00355 } 00356 00357 void 00358 _M_add_equivalence_class(const _StringT& __s) 00359 { 00360 auto __st = _M_traits.lookup_collatename(__s.data(), 00361 __s.data() + __s.size()); 00362 if (__st.empty()) 00363 __throw_regex_error(regex_constants::error_collate); 00364 __st = _M_traits.transform_primary(__st.data(), 00365 __st.data() + __st.size()); 00366 _M_equiv_set.push_back(__st); 00367 #ifdef _GLIBCXX_DEBUG 00368 _M_is_ready = false; 00369 #endif 00370 } 00371 00372 // __neg should be true for \D, \S and \W only. 00373 void 00374 _M_add_character_class(const _StringT& __s, bool __neg) 00375 { 00376 auto __mask = _M_traits.lookup_classname(__s.data(), 00377 __s.data() + __s.size(), 00378 __icase); 00379 if (__mask == 0) 00380 __throw_regex_error(regex_constants::error_ctype); 00381 if (!__neg) 00382 _M_class_set |= __mask; 00383 else 00384 _M_neg_class_set.push_back(__mask); 00385 #ifdef _GLIBCXX_DEBUG 00386 _M_is_ready = false; 00387 #endif 00388 } 00389 00390 void 00391 _M_make_range(_CharT __l, _CharT __r) 00392 { 00393 _M_range_set.push_back(make_pair(_M_translator._M_transform(__l), 00394 _M_translator._M_transform(__r))); 00395 #ifdef _GLIBCXX_DEBUG 00396 _M_is_ready = false; 00397 #endif 00398 } 00399 00400 void 00401 _M_ready() 00402 { 00403 _M_make_cache(_IsChar()); 00404 #ifdef _GLIBCXX_DEBUG 00405 _M_is_ready = true; 00406 #endif 00407 } 00408 00409 private: 00410 typedef typename is_same<_CharT, char>::type _IsChar; 00411 struct _Dummy { }; 00412 typedef typename conditional<_IsChar::value, 00413 std::bitset<1 << (8 * sizeof(_CharT))>, 00414 _Dummy>::type _CacheT; 00415 typedef typename make_unsigned<_CharT>::type _UnsignedCharT; 00416 00417 private: 00418 bool 00419 _M_apply(_CharT __ch, false_type) const; 00420 00421 bool 00422 _M_apply(_CharT __ch, true_type) const 00423 { return _M_cache[static_cast<_UnsignedCharT>(__ch)]; } 00424 00425 void 00426 _M_make_cache(true_type) 00427 { 00428 for (int __i = 0; __i < _M_cache.size(); __i++) 00429 _M_cache[static_cast<_UnsignedCharT>(__i)] = 00430 _M_apply(__i, false_type()); 00431 } 00432 00433 void 00434 _M_make_cache(false_type) 00435 { } 00436 00437 private: 00438 _CacheT _M_cache; 00439 std::vector<_CharT> _M_char_set; 00440 std::vector<_StringT> _M_equiv_set; 00441 std::vector<pair<_StrTransT, _StrTransT>> _M_range_set; 00442 std::vector<_CharClassT> _M_neg_class_set; 00443 _CharClassT _M_class_set; 00444 _TransT _M_translator; 00445 const _TraitsT& _M_traits; 00446 bool _M_is_non_matching; 00447 #ifdef _GLIBCXX_DEBUG 00448 bool _M_is_ready; 00449 #endif 00450 }; 00451 00452 //@} regex-detail 00453 _GLIBCXX_END_NAMESPACE_VERSION 00454 } // namespace __detail 00455 } // namespace std 00456 00457 #include <bits/regex_compiler.tcc>