417 lines
14 KiB
C++
417 lines
14 KiB
C++
// class template regex -*- C++ -*-
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// Copyright (C) 2010-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/**
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* @file bits/regex_constants.h
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* @brief Constant definitions for the std regex library.
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*
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{regex}
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*/
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @defgroup regex Regular Expressions
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*
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* A facility for performing regular expression pattern matching.
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* @{
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*/
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/**
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* @namespace std::regex_constants
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* @brief ISO C++ 2011 namespace for options and flags used with std::regex
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*/
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namespace regex_constants
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{
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/**
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* @name 5.1 Regular Expression Syntax Options
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*/
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//@{
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enum __syntax_option
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{
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_S_icase,
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_S_nosubs,
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_S_optimize,
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_S_collate,
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_S_ECMAScript,
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_S_basic,
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_S_extended,
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_S_awk,
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_S_grep,
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_S_egrep,
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_S_polynomial,
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_S_syntax_last
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};
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/**
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* @brief This is a bitmask type indicating how to interpret the regex.
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*
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* The @c syntax_option_type is implementation defined but it is valid to
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* perform bitwise operations on these values and expect the right thing to
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* happen.
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*
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* A valid value of type syntax_option_type shall have exactly one of the
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* elements @c ECMAScript, @c basic, @c extended, @c awk, @c grep, @c egrep
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* %set.
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*/
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enum syntax_option_type : unsigned int { };
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/**
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* Specifies that the matching of regular expressions against a character
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* sequence shall be performed without regard to case.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type icase =
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static_cast<syntax_option_type>(1 << _S_icase);
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/**
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* Specifies that when a regular expression is matched against a character
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* container sequence, no sub-expression matches are to be stored in the
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* supplied match_results structure.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type nosubs =
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static_cast<syntax_option_type>(1 << _S_nosubs);
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/**
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* Specifies that the regular expression engine should pay more attention to
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* the speed with which regular expressions are matched, and less to the
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* speed with which regular expression objects are constructed. Otherwise
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* it has no detectable effect on the program output.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type optimize =
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static_cast<syntax_option_type>(1 << _S_optimize);
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/**
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* Specifies that character ranges of the form [a-b] should be locale
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* sensitive.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type collate =
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static_cast<syntax_option_type>(1 << _S_collate);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by ECMAScript in ECMA-262 [Ecma International, ECMAScript
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* Language Specification, Standard Ecma-262, third edition, 1999], as
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* modified in section [28.13]. This grammar is similar to that defined
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* in the PERL scripting language but extended with elements found in the
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* POSIX regular expression grammar.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type ECMAScript =
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static_cast<syntax_option_type>(1 << _S_ECMAScript);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by POSIX basic regular expressions in IEEE Std 1003.1-2001,
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* Portable Operating System Interface (POSIX), Base Definitions and
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* Headers, Section 9, Regular Expressions [IEEE, Information Technology --
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* Portable Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type basic =
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static_cast<syntax_option_type>(1 << _S_basic);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by POSIX extended regular expressions in IEEE Std 1003.1-2001,
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* Portable Operating System Interface (POSIX), Base Definitions and
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* Headers, Section 9, Regular Expressions.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type extended =
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static_cast<syntax_option_type>(1 << _S_extended);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by POSIX utility awk in IEEE Std 1003.1-2001. This option is
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* identical to syntax_option_type extended, except that C-style escape
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* sequences are supported. These sequences are:
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* \\\\, \\a, \\b, \\f, \\n, \\r, \\t , \\v, \\&apos,, &apos,,
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* and \\ddd (where ddd is one, two, or three octal digits).
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type awk =
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static_cast<syntax_option_type>(1 << _S_awk);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by POSIX utility grep in IEEE Std 1003.1-2001. This option is
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* identical to syntax_option_type basic, except that newlines are treated
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* as whitespace.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type grep =
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static_cast<syntax_option_type>(1 << _S_grep);
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/**
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* Specifies that the grammar recognized by the regular expression engine is
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* that used by POSIX utility grep when given the -E option in
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* IEEE Std 1003.1-2001. This option is identical to syntax_option_type
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* extended, except that newlines are treated as whitespace.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type egrep =
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static_cast<syntax_option_type>(1 << _S_egrep);
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/**
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* Extension: Ensure both space complexity of compiled regex and
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* time complexity execution are not exponential.
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* If specified in a regex with back-references, the exception
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* regex_constants::error_complexity will be thrown.
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*/
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_GLIBCXX17_INLINE constexpr syntax_option_type __polynomial =
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static_cast<syntax_option_type>(1 << _S_polynomial);
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constexpr inline syntax_option_type
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operator&(syntax_option_type __a, syntax_option_type __b)
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{
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return (syntax_option_type)(static_cast<unsigned int>(__a)
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& static_cast<unsigned int>(__b));
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}
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constexpr inline syntax_option_type
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operator|(syntax_option_type __a, syntax_option_type __b)
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{
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return (syntax_option_type)(static_cast<unsigned int>(__a)
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| static_cast<unsigned int>(__b));
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}
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constexpr inline syntax_option_type
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operator^(syntax_option_type __a, syntax_option_type __b)
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{
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return (syntax_option_type)(static_cast<unsigned int>(__a)
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^ static_cast<unsigned int>(__b));
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}
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constexpr inline syntax_option_type
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operator~(syntax_option_type __a)
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{ return (syntax_option_type)(~static_cast<unsigned int>(__a)); }
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inline syntax_option_type&
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operator&=(syntax_option_type& __a, syntax_option_type __b)
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{ return __a = __a & __b; }
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inline syntax_option_type&
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operator|=(syntax_option_type& __a, syntax_option_type __b)
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{ return __a = __a | __b; }
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inline syntax_option_type&
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operator^=(syntax_option_type& __a, syntax_option_type __b)
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{ return __a = __a ^ __b; }
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//@}
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/**
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* @name 5.2 Matching Rules
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*
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* Matching a regular expression against a sequence of characters [first,
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* last) proceeds according to the rules of the grammar specified for the
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* regular expression object, modified according to the effects listed
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* below for any bitmask elements set.
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*
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*/
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//@{
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enum __match_flag
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{
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_S_not_bol,
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_S_not_eol,
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_S_not_bow,
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_S_not_eow,
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_S_any,
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_S_not_null,
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_S_continuous,
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_S_prev_avail,
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_S_sed,
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_S_no_copy,
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_S_first_only,
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_S_match_flag_last
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};
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/**
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* @brief This is a bitmask type indicating regex matching rules.
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*
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* The @c match_flag_type is implementation defined but it is valid to
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* perform bitwise operations on these values and expect the right thing to
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* happen.
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*/
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enum match_flag_type : unsigned int { };
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/**
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* The default matching rules.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_default =
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static_cast<match_flag_type>(0);
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/**
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* The first character in the sequence [first, last) is treated as though it
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* is not at the beginning of a line, so the character (^) in the regular
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* expression shall not match [first, first).
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_not_bol =
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static_cast<match_flag_type>(1 << _S_not_bol);
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/**
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* The last character in the sequence [first, last) is treated as though it
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* is not at the end of a line, so the character ($) in the regular
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* expression shall not match [last, last).
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_not_eol =
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static_cast<match_flag_type>(1 << _S_not_eol);
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/**
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* The expression \\b is not matched against the sub-sequence
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* [first,first).
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_not_bow =
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static_cast<match_flag_type>(1 << _S_not_bow);
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/**
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* The expression \\b should not be matched against the sub-sequence
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* [last,last).
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_not_eow =
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static_cast<match_flag_type>(1 << _S_not_eow);
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/**
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* If more than one match is possible then any match is an acceptable
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* result.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_any =
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static_cast<match_flag_type>(1 << _S_any);
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/**
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* The expression does not match an empty sequence.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_not_null =
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static_cast<match_flag_type>(1 << _S_not_null);
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/**
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* The expression only matches a sub-sequence that begins at first .
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_continuous =
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static_cast<match_flag_type>(1 << _S_continuous);
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/**
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* --first is a valid iterator position. When this flag is set then the
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* flags match_not_bol and match_not_bow are ignored by the regular
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* expression algorithms 28.11 and iterators 28.12.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type match_prev_avail =
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static_cast<match_flag_type>(1 << _S_prev_avail);
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/**
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* When a regular expression match is to be replaced by a new string, the
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* new string is constructed using the rules used by the ECMAScript replace
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* function in ECMA- 262 [Ecma International, ECMAScript Language
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* Specification, Standard Ecma-262, third edition, 1999], part 15.5.4.11
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* String.prototype.replace. In addition, during search and replace
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* operations all non-overlapping occurrences of the regular expression
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* are located and replaced, and sections of the input that did not match
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* the expression are copied unchanged to the output string.
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*
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* Format strings (from ECMA-262 [15.5.4.11]):
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* @li $$ The dollar-sign itself ($)
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* @li $& The matched substring.
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* @li $` The portion of @a string that precedes the matched substring.
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* This would be match_results::prefix().
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* @li $' The portion of @a string that follows the matched substring.
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* This would be match_results::suffix().
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* @li $n The nth capture, where n is in [1,9] and $n is not followed by a
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* decimal digit. If n <= match_results::size() and the nth capture
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* is undefined, use the empty string instead. If n >
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* match_results::size(), the result is implementation-defined.
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* @li $nn The nnth capture, where nn is a two-digit decimal number on
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* [01, 99]. If nn <= match_results::size() and the nth capture is
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* undefined, use the empty string instead. If
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* nn > match_results::size(), the result is implementation-defined.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type format_default =
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static_cast<match_flag_type>(0);
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/**
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* When a regular expression match is to be replaced by a new string, the
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* new string is constructed using the rules used by the POSIX sed utility
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* in IEEE Std 1003.1- 2001 [IEEE, Information Technology -- Portable
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* Operating System Interface (POSIX), IEEE Standard 1003.1-2001].
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type format_sed =
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static_cast<match_flag_type>(1 << _S_sed);
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/**
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* During a search and replace operation, sections of the character
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* container sequence being searched that do not match the regular
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* expression shall not be copied to the output string.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type format_no_copy =
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static_cast<match_flag_type>(1 << _S_no_copy);
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/**
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* When specified during a search and replace operation, only the first
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* occurrence of the regular expression shall be replaced.
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*/
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_GLIBCXX17_INLINE constexpr match_flag_type format_first_only =
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static_cast<match_flag_type>(1 << _S_first_only);
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constexpr inline match_flag_type
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operator&(match_flag_type __a, match_flag_type __b)
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{
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return (match_flag_type)(static_cast<unsigned int>(__a)
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& static_cast<unsigned int>(__b));
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}
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constexpr inline match_flag_type
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operator|(match_flag_type __a, match_flag_type __b)
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{
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return (match_flag_type)(static_cast<unsigned int>(__a)
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| static_cast<unsigned int>(__b));
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}
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constexpr inline match_flag_type
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operator^(match_flag_type __a, match_flag_type __b)
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{
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return (match_flag_type)(static_cast<unsigned int>(__a)
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^ static_cast<unsigned int>(__b));
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}
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constexpr inline match_flag_type
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operator~(match_flag_type __a)
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{ return (match_flag_type)(~static_cast<unsigned int>(__a)); }
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inline match_flag_type&
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operator&=(match_flag_type& __a, match_flag_type __b)
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{ return __a = __a & __b; }
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inline match_flag_type&
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operator|=(match_flag_type& __a, match_flag_type __b)
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{ return __a = __a | __b; }
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inline match_flag_type&
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operator^=(match_flag_type& __a, match_flag_type __b)
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{ return __a = __a ^ __b; }
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//@}
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} // namespace regex_constants
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/* @} */ // group regex
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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