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regex_constants.h
// class template regex -*- C++ -*- // Copyright (C) 2010-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** * @file bits/regex_constants.h * @brief Constant definitions for the std regex library. * * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{regex} */ namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @defgroup regex Regular Expressions * * A facility for performing regular expression pattern matching. * @{ */ /** * @namespace std::regex_constants * @brief ISO C++-0x entities sub namespace for regex. */ namespace regex_constants { /** * @name 5.1 Regular Expression Syntax Options */ //@{ enum __syntax_option { _S_icase, _S_nosubs, _S_optimize, _S_collate, _S_ECMAScript, _S_basic, _S_extended, _S_awk, _S_grep, _S_egrep, _S_polynomial, _S_syntax_last }; /** * @brief This is a bitmask type indicating how to interpret the regex. * * The @c syntax_option_type is implementation defined but it is valid to * perform bitwise operations on these values and expect the right thing to * happen. * * A valid value of type syntax_option_type shall have exactly one of the * elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep * %set. */ enum syntax_option_type : unsigned int { }; /** * Specifies that the matching of regular expressions against a character * sequence shall be performed without regard to case. */ _GLIBCXX17_INLINE constexpr syntax_option_type icase = static_cast<syntax_option_type>(1 << _S_icase); /** * Specifies that when a regular expression is matched against a character * container sequence, no sub-expression matches are to be stored in the * supplied match_results structure. */ _GLIBCXX17_INLINE constexpr syntax_option_type nosubs = static_cast<syntax_option_type>(1 << _S_nosubs); /** * Specifies that the regular expression engine should pay more attention to * the speed with which regular expressions are matched, and less to the * speed with which regular expression objects are constructed. Otherwise * it has no detectable effect on the program output. */ _GLIBCXX17_INLINE constexpr syntax_option_type optimize = static_cast<syntax_option_type>(1 << _S_optimize); /** * Specifies that character ranges of the form [a-b] should be locale * sensitive. */ _GLIBCXX17_INLINE constexpr syntax_option_type collate = static_cast<syntax_option_type>(1 << _S_collate); /** * Specifies that the grammar recognized by the regular expression engine is * that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript * Language Specification, Standard Ecma-262, third edition, 1999], as * modified in section [28.13]. This grammar is similar to that defined * in the PERL scripting language but extended with elements found in the * POSIX regular expression grammar. */ _GLIBCXX17_INLINE constexpr syntax_option_type ECMAScript = static_cast<syntax_option_type>(1 << _S_ECMAScript); /** * Specifies that the grammar recognized by the regular expression engine is * that used by POSIX basic regular expressions in IEEE Std 1003.1-2001, * Portable Operating System Interface (POSIX), Base Definitions and * Headers, Section 9, Regular Expressions [IEEE, Information Technology -- * Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. */ _GLIBCXX17_INLINE constexpr syntax_option_type basic = static_cast<syntax_option_type>(1 << _S_basic); /** * Specifies that the grammar recognized by the regular expression engine is * that used by POSIX extended regular expressions in IEEE Std 1003.1-2001, * Portable Operating System Interface (POSIX), Base Definitions and * Headers, Section 9, Regular Expressions. */ _GLIBCXX17_INLINE constexpr syntax_option_type extended = static_cast<syntax_option_type>(1 << _S_extended); /** * Specifies that the grammar recognized by the regular expression engine is * that used by POSIX utility awk in IEEE Std 1003.1-2001. This option is * identical to syntax_option_type extended, except that C-style escape * sequences are supported. These sequences are: * \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\&apos,, &apos,, * and \\ddd (where ddd is one, two, or three octal digits). */ _GLIBCXX17_INLINE constexpr syntax_option_type awk = static_cast<syntax_option_type>(1 << _S_awk); /** * Specifies that the grammar recognized by the regular expression engine is * that used by POSIX utility grep in IEEE Std 1003.1-2001. This option is * identical to syntax_option_type basic, except that newlines are treated * as whitespace. */ _GLIBCXX17_INLINE constexpr syntax_option_type grep = static_cast<syntax_option_type>(1 << _S_grep); /** * Specifies that the grammar recognized by the regular expression engine is * that used by POSIX utility grep when given the -E option in * IEEE Std 1003.1-2001. This option is identical to syntax_option_type * extended, except that newlines are treated as whitespace. */ _GLIBCXX17_INLINE constexpr syntax_option_type egrep = static_cast<syntax_option_type>(1 << _S_egrep); /** * Extension: Ensure both space complexity of compiled regex and * time complexity execution are not exponential. * If specified in a regex with back-references, the exception * regex_constants::error_complexity will be thrown. */ _GLIBCXX17_INLINE constexpr syntax_option_type __polynomial = static_cast<syntax_option_type>(1 << _S_polynomial); constexpr inline syntax_option_type operator&(syntax_option_type __a, syntax_option_type __b) { return (syntax_option_type)(static_cast<unsigned int>(__a) & static_cast<unsigned int>(__b)); } constexpr inline syntax_option_type operator|(syntax_option_type __a, syntax_option_type __b) { return (syntax_option_type)(static_cast<unsigned int>(__a) | static_cast<unsigned int>(__b)); } constexpr inline syntax_option_type operator^(syntax_option_type __a, syntax_option_type __b) { return (syntax_option_type)(static_cast<unsigned int>(__a) ^ static_cast<unsigned int>(__b)); } constexpr inline syntax_option_type operator~(syntax_option_type __a) { return (syntax_option_type)(~static_cast<unsigned int>(__a)); } inline syntax_option_type& operator&=(syntax_option_type& __a, syntax_option_type __b) { return __a = __a & __b; } inline syntax_option_type& operator|=(syntax_option_type& __a, syntax_option_type __b) { return __a = __a | __b; } inline syntax_option_type& operator^=(syntax_option_type& __a, syntax_option_type __b) { return __a = __a ^ __b; } //@} /** * @name 5.2 Matching Rules * * Matching a regular expression against a sequence of characters [first, * last) proceeds according to the rules of the grammar specified for the * regular expression object, modified according to the effects listed * below for any bitmask elements set. * */ //@{ enum __match_flag { _S_not_bol, _S_not_eol, _S_not_bow, _S_not_eow, _S_any, _S_not_null, _S_continuous, _S_prev_avail, _S_sed, _S_no_copy, _S_first_only, _S_match_flag_last }; /** * @brief This is a bitmask type indicating regex matching rules. * * The @c match_flag_type is implementation defined but it is valid to * perform bitwise operations on these values and expect the right thing to * happen. */ enum match_flag_type : unsigned int { }; /** * The default matching rules. */ _GLIBCXX17_INLINE constexpr match_flag_type match_default = static_cast<match_flag_type>(0); /** * The first character in the sequence [first, last) is treated as though it * is not at the beginning of a line, so the character (^) in the regular * expression shall not match [first, first). */ _GLIBCXX17_INLINE constexpr match_flag_type match_not_bol = static_cast<match_flag_type>(1 << _S_not_bol); /** * The last character in the sequence [first, last) is treated as though it * is not at the end of a line, so the character ($) in the regular * expression shall not match [last, last). */ _GLIBCXX17_INLINE constexpr match_flag_type match_not_eol = static_cast<match_flag_type>(1 << _S_not_eol); /** * The expression \\b is not matched against the sub-sequence * [first,first). */ _GLIBCXX17_INLINE constexpr match_flag_type match_not_bow = static_cast<match_flag_type>(1 << _S_not_bow); /** * The expression \\b should not be matched against the sub-sequence * [last,last). */ _GLIBCXX17_INLINE constexpr match_flag_type match_not_eow = static_cast<match_flag_type>(1 << _S_not_eow); /** * If more than one match is possible then any match is an acceptable * result. */ _GLIBCXX17_INLINE constexpr match_flag_type match_any = static_cast<match_flag_type>(1 << _S_any); /** * The expression does not match an empty sequence. */ _GLIBCXX17_INLINE constexpr match_flag_type match_not_null = static_cast<match_flag_type>(1 << _S_not_null); /** * The expression only matches a sub-sequence that begins at first . */ _GLIBCXX17_INLINE constexpr match_flag_type match_continuous = static_cast<match_flag_type>(1 << _S_continuous); /** * --first is a valid iterator position. When this flag is set then the * flags match_not_bol and match_not_bow are ignored by the regular * expression algorithms 28.11 and iterators 28.12. */ _GLIBCXX17_INLINE constexpr match_flag_type match_prev_avail = static_cast<match_flag_type>(1 << _S_prev_avail); /** * When a regular expression match is to be replaced by a new string, the * new string is constructed using the rules used by the ECMAScript replace * function in ECMA- 262 [Ecma International, ECMAScript Language * Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11 * String.prototype.replace. In addition, during search and replace * operations all non-overlapping occurrences of the regular expression * are located and replaced, and sections of the input that did not match * the expression are copied unchanged to the output string. * * Format strings (from ECMA-262 [15.5.4.11]): * @li $$ The dollar-sign itself ($) * @li $& The matched substring. * @li $` The portion of @a string that precedes the matched substring. * This would be match_results::prefix(). * @li $' The portion of @a string that follows the matched substring. * This would be match_results::suffix(). * @li $n The nth capture, where n is in [1,9] and $n is not followed by a * decimal digit. If n <= match_results::size() and the nth capture * is undefined, use the empty string instead. If n > * match_results::size(), the result is implementation-defined. * @li $nn The nnth capture, where nn is a two-digit decimal number on * [01, 99]. If nn <= match_results::size() and the nth capture is * undefined, use the empty string instead. If * nn > match_results::size(), the result is implementation-defined. */ _GLIBCXX17_INLINE constexpr match_flag_type format_default = static_cast<match_flag_type>(0); /** * When a regular expression match is to be replaced by a new string, the * new string is constructed using the rules used by the POSIX sed utility * in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable * Operating System Interface (POSIX), IEEE Standard 1003.1-2001]. */ _GLIBCXX17_INLINE constexpr match_flag_type format_sed = static_cast<match_flag_type>(1 << _S_sed); /** * During a search and replace operation, sections of the character * container sequence being searched that do not match the regular * expression shall not be copied to the output string. */ _GLIBCXX17_INLINE constexpr match_flag_type format_no_copy = static_cast<match_flag_type>(1 << _S_no_copy); /** * When specified during a search and replace operation, only the first * occurrence of the regular expression shall be replaced. */ _GLIBCXX17_INLINE constexpr match_flag_type format_first_only = static_cast<match_flag_type>(1 << _S_first_only); constexpr inline match_flag_type operator&(match_flag_type __a, match_flag_type __b) { return (match_flag_type)(static_cast<unsigned int>(__a) & static_cast<unsigned int>(__b)); } constexpr inline match_flag_type operator|(match_flag_type __a, match_flag_type __b) { return (match_flag_type)(static_cast<unsigned int>(__a) | static_cast<unsigned int>(__b)); } constexpr inline match_flag_type operator^(match_flag_type __a, match_flag_type __b) { return (match_flag_type)(static_cast<unsigned int>(__a) ^ static_cast<unsigned int>(__b)); } constexpr inline match_flag_type operator~(match_flag_type __a) { return (match_flag_type)(~static_cast<unsigned int>(__a)); } inline match_flag_type& operator&=(match_flag_type& __a, match_flag_type __b) { return __a = __a & __b; } inline match_flag_type& operator|=(match_flag_type& __a, match_flag_type __b) { return __a = __a | __b; } inline match_flag_type& operator^=(match_flag_type& __a, match_flag_type __b) { return __a = __a ^ __b; } //@} } // namespace regex_constants /* @} */ // group regex _GLIBCXX_END_NAMESPACE_VERSION } // namespace std
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