300 lines
11 KiB
C++
300 lines
11 KiB
C++
/*
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*
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* Copyright (c) 1998-2002
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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/*
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* LOCATION: see http://www.boost.org for most recent version.
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* FILE states.cpp
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* VERSION see <boost/version.hpp>
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* DESCRIPTION: Declares internal state machine structures.
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*/
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#ifndef BOOST_REGEX_V5_STATES_HPP
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#define BOOST_REGEX_V5_STATES_HPP
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namespace boost{
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namespace BOOST_REGEX_DETAIL_NS{
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/*** mask_type *******************************************************
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Whenever we have a choice of two alternatives, we use an array of bytes
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to indicate which of the two alternatives it is possible to take for any
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given input character. If mask_take is set, then we can take the next
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state, and if mask_skip is set then we can take the alternative.
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***********************************************************************/
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enum mask_type
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{
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mask_take = 1,
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mask_skip = 2,
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mask_init = 4,
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mask_any = mask_skip | mask_take,
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mask_all = mask_any
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};
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/*** helpers **********************************************************
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These helpers let us use function overload resolution to detect whether
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we have narrow or wide character strings:
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***********************************************************************/
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struct _narrow_type{};
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struct _wide_type{};
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template <class charT> struct is_byte;
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template<> struct is_byte<char> { typedef _narrow_type width_type; };
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template<> struct is_byte<unsigned char>{ typedef _narrow_type width_type; };
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template<> struct is_byte<signed char> { typedef _narrow_type width_type; };
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template <class charT> struct is_byte { typedef _wide_type width_type; };
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/*** enum syntax_element_type ******************************************
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Every record in the state machine falls into one of the following types:
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***********************************************************************/
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enum syntax_element_type
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{
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// start of a marked sub-expression, or perl-style (?...) extension
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syntax_element_startmark = 0,
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// end of a marked sub-expression, or perl-style (?...) extension
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syntax_element_endmark = syntax_element_startmark + 1,
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// any sequence of literal characters
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syntax_element_literal = syntax_element_endmark + 1,
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// start of line assertion: ^
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syntax_element_start_line = syntax_element_literal + 1,
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// end of line assertion $
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syntax_element_end_line = syntax_element_start_line + 1,
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// match any character: .
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syntax_element_wild = syntax_element_end_line + 1,
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// end of expression: we have a match when we get here
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syntax_element_match = syntax_element_wild + 1,
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// perl style word boundary: \b
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syntax_element_word_boundary = syntax_element_match + 1,
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// perl style within word boundary: \B
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syntax_element_within_word = syntax_element_word_boundary + 1,
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// start of word assertion: \<
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syntax_element_word_start = syntax_element_within_word + 1,
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// end of word assertion: \>
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syntax_element_word_end = syntax_element_word_start + 1,
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// start of buffer assertion: \`
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syntax_element_buffer_start = syntax_element_word_end + 1,
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// end of buffer assertion: \'
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syntax_element_buffer_end = syntax_element_buffer_start + 1,
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// backreference to previously matched sub-expression
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syntax_element_backref = syntax_element_buffer_end + 1,
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// either a wide character set [..] or one with multicharacter collating elements:
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syntax_element_long_set = syntax_element_backref + 1,
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// narrow character set: [...]
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syntax_element_set = syntax_element_long_set + 1,
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// jump to a new state in the machine:
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syntax_element_jump = syntax_element_set + 1,
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// choose between two production states:
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syntax_element_alt = syntax_element_jump + 1,
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// a repeat
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syntax_element_rep = syntax_element_alt + 1,
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// match a combining character sequence
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syntax_element_combining = syntax_element_rep + 1,
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// perl style soft buffer end: \z
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syntax_element_soft_buffer_end = syntax_element_combining + 1,
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// perl style continuation: \G
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syntax_element_restart_continue = syntax_element_soft_buffer_end + 1,
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// single character repeats:
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syntax_element_dot_rep = syntax_element_restart_continue + 1,
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syntax_element_char_rep = syntax_element_dot_rep + 1,
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syntax_element_short_set_rep = syntax_element_char_rep + 1,
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syntax_element_long_set_rep = syntax_element_short_set_rep + 1,
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// a backstep for lookbehind repeats:
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syntax_element_backstep = syntax_element_long_set_rep + 1,
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// an assertion that a mark was matched:
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syntax_element_assert_backref = syntax_element_backstep + 1,
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syntax_element_toggle_case = syntax_element_assert_backref + 1,
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// a recursive expression:
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syntax_element_recurse = syntax_element_toggle_case + 1,
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// Verbs:
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syntax_element_fail = syntax_element_recurse + 1,
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syntax_element_accept = syntax_element_fail + 1,
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syntax_element_commit = syntax_element_accept + 1,
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syntax_element_then = syntax_element_commit + 1
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};
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#ifdef BOOST_REGEX_DEBUG
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// dwa 09/26/00 - This is needed to suppress warnings about an ambiguous conversion
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std::ostream& operator<<(std::ostream&, syntax_element_type);
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#endif
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struct re_syntax_base;
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/*** union offset_type ************************************************
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Points to another state in the machine. During machine construction
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we use integral offsets, but these are converted to pointers before
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execution of the machine.
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***********************************************************************/
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union offset_type
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{
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re_syntax_base* p;
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std::ptrdiff_t i;
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};
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/*** struct re_syntax_base ********************************************
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Base class for all states in the machine.
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***********************************************************************/
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struct re_syntax_base
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{
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syntax_element_type type; // what kind of state this is
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offset_type next; // next state in the machine
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};
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/*** struct re_brace **************************************************
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A marked parenthesis.
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***********************************************************************/
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struct re_brace : public re_syntax_base
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{
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// The index to match, can be zero (don't mark the sub-expression)
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// or negative (for perl style (?...) extensions):
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int index;
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bool icase;
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};
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/*** struct re_dot **************************************************
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Match anything.
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***********************************************************************/
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enum
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{
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dont_care = 1,
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force_not_newline = 0,
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force_newline = 2,
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test_not_newline = 2,
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test_newline = 3
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};
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struct re_dot : public re_syntax_base
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{
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unsigned char mask;
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};
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/*** struct re_literal ************************************************
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A string of literals, following this structure will be an
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array of characters: charT[length]
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***********************************************************************/
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struct re_literal : public re_syntax_base
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{
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unsigned int length;
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};
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/*** struct re_case ************************************************
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Indicates whether we are moving to a case insensive block or not
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***********************************************************************/
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struct re_case : public re_syntax_base
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{
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bool icase;
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};
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/*** struct re_set_long ***********************************************
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A wide character set of characters, following this structure will be
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an array of type charT:
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First csingles null-terminated strings
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Then 2 * cranges NULL terminated strings
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Then cequivalents NULL terminated strings
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***********************************************************************/
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template <class mask_type>
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struct re_set_long : public re_syntax_base
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{
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unsigned int csingles, cranges, cequivalents;
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mask_type cclasses;
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mask_type cnclasses;
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bool isnot;
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bool singleton;
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};
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/*** struct re_set ****************************************************
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A set of narrow-characters, matches any of _map which is none-zero
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***********************************************************************/
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struct re_set : public re_syntax_base
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{
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unsigned char _map[1 << CHAR_BIT];
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};
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/*** struct re_jump ***************************************************
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Jump to a new location in the machine (not next).
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***********************************************************************/
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struct re_jump : public re_syntax_base
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{
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offset_type alt; // location to jump to
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};
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/*** struct re_alt ***************************************************
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Jump to a new location in the machine (possibly next).
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***********************************************************************/
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struct re_alt : public re_jump
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{
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unsigned char _map[1 << CHAR_BIT]; // which characters can take the jump
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unsigned int can_be_null; // true if we match a NULL string
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};
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/*** struct re_repeat *************************************************
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Repeat a section of the machine
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***********************************************************************/
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struct re_repeat : public re_alt
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{
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std::size_t min, max; // min and max allowable repeats
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int state_id; // Unique identifier for this repeat
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bool leading; // True if this repeat is at the start of the machine (lets us optimize some searches)
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bool greedy; // True if this is a greedy repeat
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};
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/*** struct re_recurse ************************************************
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Recurse to a particular subexpression.
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**********************************************************************/
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struct re_recurse : public re_jump
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{
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int state_id; // identifier of first nested repeat within the recursion.
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};
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/*** struct re_commit *************************************************
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Used for the PRUNE, SKIP and COMMIT verbs which basically differ only in what happens
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if no match is found and we start searching forward.
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**********************************************************************/
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enum commit_type
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{
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commit_prune,
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commit_skip,
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commit_commit
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};
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struct re_commit : public re_syntax_base
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{
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commit_type action;
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};
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/*** enum re_jump_size_type *******************************************
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Provides compiled size of re_jump structure (allowing for trailing alignment).
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We provide this so we know how manybytes to insert when constructing the machine
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(The value of padding_mask is defined in regex_raw_buffer.hpp).
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***********************************************************************/
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enum re_jump_size_type
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{
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re_jump_size = (sizeof(re_jump) + padding_mask) & ~(padding_mask),
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re_repeater_size = (sizeof(re_repeat) + padding_mask) & ~(padding_mask),
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re_alt_size = (sizeof(re_alt) + padding_mask) & ~(padding_mask)
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};
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/*** proc re_is_set_member *********************************************
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Forward declaration: we'll need this one later...
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***********************************************************************/
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template<class charT, class traits>
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struct regex_data;
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template <class iterator, class charT, class traits_type, class char_classT>
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iterator re_is_set_member(iterator next,
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iterator last,
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const re_set_long<char_classT>* set_,
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const regex_data<charT, traits_type>& e, bool icase);
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} // namespace BOOST_REGEX_DETAIL_NS
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} // namespace boost
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#endif
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