mirror of git://gcc.gnu.org/git/gcc.git
311 lines
11 KiB
C++
311 lines
11 KiB
C++
// class template regex -*- C++ -*-
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// Copyright (C) 2010, 2011, 2012 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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/**
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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++-0x entities sub namespace for regex.
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*/
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namespace regex_constants
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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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_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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typedef unsigned int syntax_option_type;
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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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constexpr syntax_option_type icase = 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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constexpr syntax_option_type nosubs = 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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constexpr syntax_option_type optimize = 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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constexpr syntax_option_type collate = 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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constexpr syntax_option_type ECMAScript = 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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constexpr syntax_option_type basic = 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 Headers,
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* Section 9, Regular Expressions.
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*/
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constexpr syntax_option_type extended = 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, \\', ',
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* and \\ddd (where ddd is one, two, or three octal digits).
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*/
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constexpr syntax_option_type awk = 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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constexpr syntax_option_type grep = 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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constexpr syntax_option_type egrep = 1 << _S_egrep;
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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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typedef std::bitset<_S_match_flag_last> match_flag_type;
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/**
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* The default matching rules.
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*/
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constexpr match_flag_type match_default = 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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constexpr match_flag_type match_not_bol = 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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constexpr match_flag_type match_not_eol = 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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constexpr match_flag_type match_not_bow = 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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constexpr match_flag_type match_not_eow = 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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constexpr match_flag_type match_any = 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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constexpr match_flag_type match_not_null = 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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constexpr match_flag_type match_continuous = 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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constexpr match_flag_type match_prev_avail = 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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constexpr match_flag_type format_default = 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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constexpr match_flag_type format_sed = 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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constexpr match_flag_type format_no_copy = 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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constexpr match_flag_type format_first_only = 1 << _S_first_only;
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//@}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace regex_constants
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/* @} */ // group regex
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} // namespace std
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