libstdc++
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00001 // class template regex -*- C++ -*- 00002 00003 // Copyright (C) 2010-2016 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_constants.h 00027 * @brief Constant definitions for the std regex library. 00028 * 00029 * This is an internal header file, included by other library headers. 00030 * Do not attempt to use it directly. @headername{regex} 00031 */ 00032 00033 namespace std _GLIBCXX_VISIBILITY(default) 00034 { 00035 /** 00036 * @defgroup regex Regular Expressions 00037 * 00038 * A facility for performing regular expression pattern matching. 00039 * @{ 00040 */ 00041 00042 /** 00043 * @namespace std::regex_constants 00044 * @brief ISO C++-0x entities sub namespace for regex. 00045 */ 00046 namespace regex_constants 00047 { 00048 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00049 00050 /** 00051 * @name 5.1 Regular Expression Syntax Options 00052 */ 00053 //@{ 00054 enum __syntax_option 00055 { 00056 _S_icase, 00057 _S_nosubs, 00058 _S_optimize, 00059 _S_collate, 00060 _S_ECMAScript, 00061 _S_basic, 00062 _S_extended, 00063 _S_awk, 00064 _S_grep, 00065 _S_egrep, 00066 _S_polynomial, 00067 _S_syntax_last 00068 }; 00069 00070 /** 00071 * @brief This is a bitmask type indicating how to interpret the regex. 00072 * 00073 * The @c syntax_option_type is implementation defined but it is valid to 00074 * perform bitwise operations on these values and expect the right thing to 00075 * happen. 00076 * 00077 * A valid value of type syntax_option_type shall have exactly one of the 00078 * elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep 00079 * %set. 00080 */ 00081 enum syntax_option_type : unsigned int { }; 00082 00083 /** 00084 * Specifies that the matching of regular expressions against a character 00085 * sequence shall be performed without regard to case. 00086 */ 00087 constexpr syntax_option_type icase = 00088 static_cast<syntax_option_type>(1 << _S_icase); 00089 00090 /** 00091 * Specifies that when a regular expression is matched against a character 00092 * container sequence, no sub-expression matches are to be stored in the 00093 * supplied match_results structure. 00094 */ 00095 constexpr syntax_option_type nosubs = 00096 static_cast<syntax_option_type>(1 << _S_nosubs); 00097 00098 /** 00099 * Specifies that the regular expression engine should pay more attention to 00100 * the speed with which regular expressions are matched, and less to the 00101 * speed with which regular expression objects are constructed. Otherwise 00102 * it has no detectable effect on the program output. 00103 */ 00104 constexpr syntax_option_type optimize = 00105 static_cast<syntax_option_type>(1 << _S_optimize); 00106 00107 /** 00108 * Specifies that character ranges of the form [a-b] should be locale 00109 * sensitive. 00110 */ 00111 constexpr syntax_option_type collate = 00112 static_cast<syntax_option_type>(1 << _S_collate); 00113 00114 /** 00115 * Specifies that the grammar recognized by the regular expression engine is 00116 * that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript 00117 * Language Specification, Standard Ecma-262, third edition, 1999], as 00118 * modified in section [28.13]. This grammar is similar to that defined 00119 * in the PERL scripting language but extended with elements found in the 00120 * POSIX regular expression grammar. 00121 */ 00122 constexpr syntax_option_type ECMAScript = 00123 static_cast<syntax_option_type>(1 << _S_ECMAScript); 00124 00125 /** 00126 * Specifies that the grammar recognized by the regular expression engine is 00127 * that used by POSIX basic regular expressions in IEEE Std 1003.1-2001, 00128 * Portable Operating System Interface (POSIX), Base Definitions and 00129 * Headers, Section 9, Regular Expressions [IEEE, Information Technology -- 00130 * Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. 00131 */ 00132 constexpr syntax_option_type basic = 00133 static_cast<syntax_option_type>(1 << _S_basic); 00134 00135 /** 00136 * Specifies that the grammar recognized by the regular expression engine is 00137 * that used by POSIX extended regular expressions in IEEE Std 1003.1-2001, 00138 * Portable Operating System Interface (POSIX), Base Definitions and 00139 * Headers, Section 9, Regular Expressions. 00140 */ 00141 constexpr syntax_option_type extended = 00142 static_cast<syntax_option_type>(1 << _S_extended); 00143 00144 /** 00145 * Specifies that the grammar recognized by the regular expression engine is 00146 * that used by POSIX utility awk in IEEE Std 1003.1-2001. This option is 00147 * identical to syntax_option_type extended, except that C-style escape 00148 * sequences are supported. These sequences are: 00149 * \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\&apos,, &apos,, 00150 * and \\ddd (where ddd is one, two, or three octal digits). 00151 */ 00152 constexpr syntax_option_type awk = 00153 static_cast<syntax_option_type>(1 << _S_awk); 00154 00155 /** 00156 * Specifies that the grammar recognized by the regular expression engine is 00157 * that used by POSIX utility grep in IEEE Std 1003.1-2001. This option is 00158 * identical to syntax_option_type basic, except that newlines are treated 00159 * as whitespace. 00160 */ 00161 constexpr syntax_option_type grep = 00162 static_cast<syntax_option_type>(1 << _S_grep); 00163 00164 /** 00165 * Specifies that the grammar recognized by the regular expression engine is 00166 * that used by POSIX utility grep when given the -E option in 00167 * IEEE Std 1003.1-2001. This option is identical to syntax_option_type 00168 * extended, except that newlines are treated as whitespace. 00169 */ 00170 constexpr syntax_option_type egrep = 00171 static_cast<syntax_option_type>(1 << _S_egrep); 00172 00173 /** 00174 * Extension: Ensure both space complexity of compiled regex and 00175 * time complexity execution are not exponential. 00176 * If specified in a regex with back-references, the exception 00177 * regex_constants::error_complexity will be thrown. 00178 */ 00179 constexpr syntax_option_type __polynomial = 00180 static_cast<syntax_option_type>(1 << _S_polynomial); 00181 00182 constexpr inline syntax_option_type 00183 operator&(syntax_option_type __a, syntax_option_type __b) 00184 { 00185 return (syntax_option_type)(static_cast<unsigned int>(__a) 00186 & static_cast<unsigned int>(__b)); 00187 } 00188 00189 constexpr inline syntax_option_type 00190 operator|(syntax_option_type __a, syntax_option_type __b) 00191 { 00192 return (syntax_option_type)(static_cast<unsigned int>(__a) 00193 | static_cast<unsigned int>(__b)); 00194 } 00195 00196 constexpr inline syntax_option_type 00197 operator^(syntax_option_type __a, syntax_option_type __b) 00198 { 00199 return (syntax_option_type)(static_cast<unsigned int>(__a) 00200 ^ static_cast<unsigned int>(__b)); 00201 } 00202 00203 constexpr inline syntax_option_type 00204 operator~(syntax_option_type __a) 00205 { return (syntax_option_type)(~static_cast<unsigned int>(__a)); } 00206 00207 inline syntax_option_type& 00208 operator&=(syntax_option_type& __a, syntax_option_type __b) 00209 { return __a = __a & __b; } 00210 00211 inline syntax_option_type& 00212 operator|=(syntax_option_type& __a, syntax_option_type __b) 00213 { return __a = __a | __b; } 00214 00215 inline syntax_option_type& 00216 operator^=(syntax_option_type& __a, syntax_option_type __b) 00217 { return __a = __a ^ __b; } 00218 00219 //@} 00220 00221 /** 00222 * @name 5.2 Matching Rules 00223 * 00224 * Matching a regular expression against a sequence of characters [first, 00225 * last) proceeds according to the rules of the grammar specified for the 00226 * regular expression object, modified according to the effects listed 00227 * below for any bitmask elements set. 00228 * 00229 */ 00230 //@{ 00231 00232 enum __match_flag 00233 { 00234 _S_not_bol, 00235 _S_not_eol, 00236 _S_not_bow, 00237 _S_not_eow, 00238 _S_any, 00239 _S_not_null, 00240 _S_continuous, 00241 _S_prev_avail, 00242 _S_sed, 00243 _S_no_copy, 00244 _S_first_only, 00245 _S_match_flag_last 00246 }; 00247 00248 /** 00249 * @brief This is a bitmask type indicating regex matching rules. 00250 * 00251 * The @c match_flag_type is implementation defined but it is valid to 00252 * perform bitwise operations on these values and expect the right thing to 00253 * happen. 00254 */ 00255 enum match_flag_type : unsigned int { }; 00256 00257 /** 00258 * The default matching rules. 00259 */ 00260 constexpr match_flag_type match_default = static_cast<match_flag_type>(0); 00261 00262 /** 00263 * The first character in the sequence [first, last) is treated as though it 00264 * is not at the beginning of a line, so the character (^) in the regular 00265 * expression shall not match [first, first). 00266 */ 00267 constexpr match_flag_type match_not_bol = 00268 static_cast<match_flag_type>(1 << _S_not_bol); 00269 00270 /** 00271 * The last character in the sequence [first, last) is treated as though it 00272 * is not at the end of a line, so the character ($) in the regular 00273 * expression shall not match [last, last). 00274 */ 00275 constexpr match_flag_type match_not_eol = 00276 static_cast<match_flag_type>(1 << _S_not_eol); 00277 00278 /** 00279 * The expression \\b is not matched against the sub-sequence 00280 * [first,first). 00281 */ 00282 constexpr match_flag_type match_not_bow = 00283 static_cast<match_flag_type>(1 << _S_not_bow); 00284 00285 /** 00286 * The expression \\b should not be matched against the sub-sequence 00287 * [last,last). 00288 */ 00289 constexpr match_flag_type match_not_eow = 00290 static_cast<match_flag_type>(1 << _S_not_eow); 00291 00292 /** 00293 * If more than one match is possible then any match is an acceptable 00294 * result. 00295 */ 00296 constexpr match_flag_type match_any = 00297 static_cast<match_flag_type>(1 << _S_any); 00298 00299 /** 00300 * The expression does not match an empty sequence. 00301 */ 00302 constexpr match_flag_type match_not_null = 00303 static_cast<match_flag_type>(1 << _S_not_null); 00304 00305 /** 00306 * The expression only matches a sub-sequence that begins at first . 00307 */ 00308 constexpr match_flag_type match_continuous = 00309 static_cast<match_flag_type>(1 << _S_continuous); 00310 00311 /** 00312 * --first is a valid iterator position. When this flag is set then the 00313 * flags match_not_bol and match_not_bow are ignored by the regular 00314 * expression algorithms 28.11 and iterators 28.12. 00315 */ 00316 constexpr match_flag_type match_prev_avail = 00317 static_cast<match_flag_type>(1 << _S_prev_avail); 00318 00319 /** 00320 * When a regular expression match is to be replaced by a new string, the 00321 * new string is constructed using the rules used by the ECMAScript replace 00322 * function in ECMA- 262 [Ecma International, ECMAScript Language 00323 * Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11 00324 * String.prototype.replace. In addition, during search and replace 00325 * operations all non-overlapping occurrences of the regular expression 00326 * are located and replaced, and sections of the input that did not match 00327 * the expression are copied unchanged to the output string. 00328 * 00329 * Format strings (from ECMA-262 [15.5.4.11]): 00330 * @li $$ The dollar-sign itself ($) 00331 * @li $& The matched substring. 00332 * @li $` The portion of @a string that precedes the matched substring. 00333 * This would be match_results::prefix(). 00334 * @li $' The portion of @a string that follows the matched substring. 00335 * This would be match_results::suffix(). 00336 * @li $n The nth capture, where n is in [1,9] and $n is not followed by a 00337 * decimal digit. If n <= match_results::size() and the nth capture 00338 * is undefined, use the empty string instead. If n > 00339 * match_results::size(), the result is implementation-defined. 00340 * @li $nn The nnth capture, where nn is a two-digit decimal number on 00341 * [01, 99]. If nn <= match_results::size() and the nth capture is 00342 * undefined, use the empty string instead. If 00343 * nn > match_results::size(), the result is implementation-defined. 00344 */ 00345 constexpr match_flag_type format_default = static_cast<match_flag_type>(0); 00346 00347 /** 00348 * When a regular expression match is to be replaced by a new string, the 00349 * new string is constructed using the rules used by the POSIX sed utility 00350 * in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable 00351 * Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. 00352 */ 00353 constexpr match_flag_type format_sed = 00354 static_cast<match_flag_type>(1 << _S_sed); 00355 00356 /** 00357 * During a search and replace operation, sections of the character 00358 * container sequence being searched that do not match the regular 00359 * expression shall not be copied to the output string. 00360 */ 00361 constexpr match_flag_type format_no_copy = 00362 static_cast<match_flag_type>(1 << _S_no_copy); 00363 00364 /** 00365 * When specified during a search and replace operation, only the first 00366 * occurrence of the regular expression shall be replaced. 00367 */ 00368 constexpr match_flag_type format_first_only = 00369 static_cast<match_flag_type>(1 << _S_first_only); 00370 00371 constexpr inline match_flag_type 00372 operator&(match_flag_type __a, match_flag_type __b) 00373 { 00374 return (match_flag_type)(static_cast<unsigned int>(__a) 00375 & static_cast<unsigned int>(__b)); 00376 } 00377 00378 constexpr inline match_flag_type 00379 operator|(match_flag_type __a, match_flag_type __b) 00380 { 00381 return (match_flag_type)(static_cast<unsigned int>(__a) 00382 | static_cast<unsigned int>(__b)); 00383 } 00384 00385 constexpr inline match_flag_type 00386 operator^(match_flag_type __a, match_flag_type __b) 00387 { 00388 return (match_flag_type)(static_cast<unsigned int>(__a) 00389 ^ static_cast<unsigned int>(__b)); 00390 } 00391 00392 constexpr inline match_flag_type 00393 operator~(match_flag_type __a) 00394 { return (match_flag_type)(~static_cast<unsigned int>(__a)); } 00395 00396 inline match_flag_type& 00397 operator&=(match_flag_type& __a, match_flag_type __b) 00398 { return __a = __a & __b; } 00399 00400 inline match_flag_type& 00401 operator|=(match_flag_type& __a, match_flag_type __b) 00402 { return __a = __a | __b; } 00403 00404 inline match_flag_type& 00405 operator^=(match_flag_type& __a, match_flag_type __b) 00406 { return __a = __a ^ __b; } 00407 00408 //@} 00409 00410 _GLIBCXX_END_NAMESPACE_VERSION 00411 } // namespace regex_constants 00412 00413 /* @} */ // group regex 00414 } // namespace std 00415