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// class template regex -*- C++ -*- |
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// Copyright (C) 2010-2013 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. |
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// 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. |
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// 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. |
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// 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/>. |
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/** |
* @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} |
*/ |
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namespace std _GLIBCXX_VISIBILITY(default) |
{ |
/** |
* @defgroup regex Regular Expressions |
* |
* A facility for performing regular expression pattern matching. |
* @{ |
*/ |
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/** |
* @namespace std::regex_constants |
* @brief ISO C++-0x entities sub namespace for regex. |
*/ |
namespace regex_constants |
{ |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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/** |
* @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_syntax_last |
}; |
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/** |
* @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. |
*/ |
typedef unsigned int syntax_option_type; |
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/** |
* Specifies that the matching of regular expressions against a character |
* sequence shall be performed without regard to case. |
*/ |
constexpr syntax_option_type icase = 1 << _S_icase; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type nosubs = 1 << _S_nosubs; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type optimize = 1 << _S_optimize; |
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/** |
* Specifies that character ranges of the form [a-b] should be locale |
* sensitive. |
*/ |
constexpr syntax_option_type collate = 1 << _S_collate; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type ECMAScript = 1 << _S_ECMAScript; |
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/** |
* 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]. |
*/ |
constexpr syntax_option_type basic = 1 << _S_basic; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type extended = 1 << _S_extended; |
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/** |
* 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, \\', ', |
* and \\ddd (where ddd is one, two, or three octal digits). |
*/ |
constexpr syntax_option_type awk = 1 << _S_awk; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type grep = 1 << _S_grep; |
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/** |
* 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. |
*/ |
constexpr syntax_option_type egrep = 1 << _S_egrep; |
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//@} |
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/** |
* @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. |
* |
*/ |
//@{ |
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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 |
}; |
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/** |
* @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. |
*/ |
typedef std::bitset<_S_match_flag_last> match_flag_type; |
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/** |
* The default matching rules. |
*/ |
constexpr match_flag_type match_default = 0; |
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/** |
* 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). |
*/ |
constexpr match_flag_type match_not_bol = 1 << _S_not_bol; |
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/** |
* 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). |
*/ |
constexpr match_flag_type match_not_eol = 1 << _S_not_eol; |
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/** |
* The expression \\b is not matched against the sub-sequence |
* [first,first). |
*/ |
constexpr match_flag_type match_not_bow = 1 << _S_not_bow; |
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/** |
* The expression \\b should not be matched against the sub-sequence |
* [last,last). |
*/ |
constexpr match_flag_type match_not_eow = 1 << _S_not_eow; |
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/** |
* If more than one match is possible then any match is an acceptable |
* result. |
*/ |
constexpr match_flag_type match_any = 1 << _S_any; |
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/** |
* The expression does not match an empty sequence. |
*/ |
constexpr match_flag_type match_not_null = 1 << _S_not_null; |
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/** |
* The expression only matches a sub-sequence that begins at first . |
*/ |
constexpr match_flag_type match_continuous = 1 << _S_continuous; |
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/** |
* --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. |
*/ |
constexpr match_flag_type match_prev_avail = 1 << _S_prev_avail; |
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/** |
* 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. |
*/ |
constexpr match_flag_type format_default = 0; |
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/** |
* 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]. |
*/ |
constexpr match_flag_type format_sed = 1 << _S_sed; |
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/** |
* 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. |
*/ |
constexpr match_flag_type format_no_copy = 1 << _S_no_copy; |
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/** |
* When specified during a search and replace operation, only the first |
* occurrence of the regular expression shall be replaced. |
*/ |
constexpr match_flag_type format_first_only = 1 << _S_first_only; |
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//@} |
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_GLIBCXX_END_NAMESPACE_VERSION |
} // namespace regex_constants |
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/* @} */ // group regex |
} // namespace std |
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