/*
*
* Copyright (c) 1998-2002
* John Maddock
*
* Use, modification and distribution are subject to the
* Boost Software License, Version 1.0. (See accompanying file
* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE states.cpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Declares internal state machine structures.
*/
#ifndef BOOST_REGEX_V4_STATES_HPP
#define BOOST_REGEX_V4_STATES_HPP
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
namespace boost{
namespace re_detail{
/*** mask_type *******************************************************
Whenever we have a choice of two alternatives, we use an array of bytes
to indicate which of the two alternatives it is possible to take for any
given input character. If mask_take is set, then we can take the next
state, and if mask_skip is set then we can take the alternative.
***********************************************************************/
enum mask_type
{
mask_take = 1,
mask_skip = 2,
mask_init = 4,
mask_any = mask_skip | mask_take,
mask_all = mask_any
};
/*** helpers **********************************************************
These helpers let us use function overload resolution to detect whether
we have narrow or wide character strings:
***********************************************************************/
struct _narrow_type{};
struct _wide_type{};
template <class charT> struct is_byte;
template<> struct is_byte<char> { typedef _narrow_type width_type; };
template<> struct is_byte<unsigned char>{ typedef _narrow_type width_type; };
template<> struct is_byte<signed char> { typedef _narrow_type width_type; };
template <class charT> struct is_byte { typedef _wide_type width_type; };
/*** enum syntax_element_type ******************************************
Every record in the state machine falls into one of the following types:
***********************************************************************/
enum syntax_element_type
{
// start of a marked sub-expression, or perl-style (?...) extension
syntax_element_startmark = 0,
// end of a marked sub-expression, or perl-style (?...) extension
syntax_element_endmark = syntax_element_startmark + 1,
// any sequence of literal characters
syntax_element_literal = syntax_element_endmark + 1,
// start of line assertion: ^
syntax_element_start_line = syntax_element_literal + 1,
// end of line assertion $
syntax_element_end_line = syntax_element_start_line + 1,
// match any character: .
syntax_element_wild = syntax_element_end_line + 1,
// end of expression: we have a match when we get here
syntax_element_match = syntax_element_wild + 1,
// perl style word boundary: \b
syntax_element_word_boundary = syntax_element_match + 1,
// perl style within word boundary: \B
syntax_element_within_word = syntax_element_word_boundary + 1,
// start of word assertion: \<
syntax_element_word_start = syntax_element_within_word + 1,
// end of word assertion: \>
syntax_element_word_end = syntax_element_word_start + 1,
// start of buffer assertion: \`
syntax_element_buffer_start = syntax_element_word_end + 1,
// end of buffer assertion: \'
syntax_element_buffer_end = syntax_element_buffer_start + 1,
// backreference to previously matched sub-expression
syntax_element_backref = syntax_element_buffer_end + 1,
// either a wide character set [..] or one with multicharacter collating elements:
syntax_element_long_set = syntax_element_backref + 1,
// narrow character set: [...]
syntax_element_set = syntax_element_long_set + 1,
// jump to a new state in the machine:
syntax_element_jump = syntax_element_set + 1,
// choose between two production states:
syntax_element_alt = syntax_element_jump + 1,
// a repeat
syntax_element_rep = syntax_element_alt + 1,
// match a combining character sequence
syntax_element_combining = syntax_element_rep + 1,
// perl style soft buffer end: \z
syntax_element_soft_buffer_end = syntax_element_combining + 1,
// perl style continuation: \G
syntax_element_restart_continue = syntax_element_soft_buffer_end + 1,
// single character repeats:
syntax_element_dot_rep = syntax_element_restart_continue + 1,
syntax_element_char_rep = syntax_element_dot_rep + 1,
syntax_element_short_set_rep = syntax_element_char_rep + 1,
syntax_element_long_set_rep = syntax_element_short_set_rep + 1,
// a backstep for lookbehind repeats:
syntax_element_backstep = syntax_element_long_set_rep + 1,
// an assertion that a mark was matched:
syntax_element_assert_backref = syntax_element_backstep + 1,
syntax_element_toggle_case = syntax_element_assert_backref + 1
};
#ifdef BOOST_REGEX_DEBUG
// dwa 09/26/00 - This is needed to suppress warnings about an ambiguous conversion
std::ostream& operator<<(std::ostream&, syntax_element_type);
#endif
struct re_syntax_base;
/*** union offset_type ************************************************
Points to another state in the machine. During machine construction
we use integral offsets, but these are converted to pointers before
execution of the machine.
***********************************************************************/
union offset_type
{
re_syntax_base* p;
std::ptrdiff_t i;
};
/*** struct re_syntax_base ********************************************
Base class for all states in the machine.
***********************************************************************/
struct re_syntax_base
{
syntax_element_type type; // what kind of state this is
offset_type next; // next state in the machine
};
/*** struct re_brace **************************************************
A marked parenthesis.
***********************************************************************/
struct re_brace : public re_syntax_base
{
// The index to match, can be zero (don't mark the sub-expression)
// or negative (for perl style (?...) extentions):
int index;
};
/*** struct re_dot **************************************************
Match anything.
***********************************************************************/
enum
{
dont_care = 1,
force_not_newline = 0,
force_newline = 2,
test_not_newline = 2,
test_newline = 3
};
struct re_dot : public re_syntax_base
{
unsigned char mask;
};
/*** struct re_literal ************************************************
A string of literals, following this structure will be an
array of characters: charT[length]
***********************************************************************/
struct re_literal : public re_syntax_base
{
unsigned int length;
};
/*** struct re_case ************************************************
Indicates whether we are moving to a case insensive block or not
***********************************************************************/
struct re_case : public re_syntax_base
{
bool icase;
};
/*** struct re_set_long ***********************************************
A wide character set of characters, following this structure will be
an array of type charT:
First csingles null-terminated strings
Then 2 * cranges NULL terminated strings
Then cequivalents NULL terminated strings
***********************************************************************/
template <class mask_type>
struct re_set_long : public re_syntax_base
{
unsigned int csingles, cranges, cequivalents;
mask_type cclasses;
mask_type cnclasses;
bool isnot;
bool singleton;
};
/*** struct re_set ****************************************************
A set of narrow-characters, matches any of _map which is none-zero
***********************************************************************/
struct re_set : public re_syntax_base
{
unsigned char _map[1 << CHAR_BIT];
};
/*** struct re_jump ***************************************************
Jump to a new location in the machine (not next).
***********************************************************************/
struct re_jump : public re_syntax_base
{
offset_type alt; // location to jump to
};
/*** struct re_alt ***************************************************
Jump to a new location in the machine (possibly next).
***********************************************************************/
struct re_alt : public re_jump
{
unsigned char _map[1 << CHAR_BIT]; // which characters can take the jump
unsigned int can_be_null; // true if we match a NULL string
};
/*** struct re_repeat *************************************************
Repeat a section of the machine
***********************************************************************/
struct re_repeat : public re_alt
{
std::size_t min, max; // min and max allowable repeats
int state_id; // Unique identifier for this repeat
bool leading; // True if this repeat is at the start of the machine (lets us optimize some searches)
bool greedy; // True if this is a greedy repeat
};
/*** enum re_jump_size_type *******************************************
Provides compiled size of re_jump structure (allowing for trailing alignment).
We provide this so we know how manybytes to insert when constructing the machine
(The value of padding_mask is defined in regex_raw_buffer.hpp).
***********************************************************************/
enum re_jump_size_type
{
re_jump_size = (sizeof(re_jump) + padding_mask) & ~(padding_mask),
re_repeater_size = (sizeof(re_repeat) + padding_mask) & ~(padding_mask),
re_alt_size = (sizeof(re_alt) + padding_mask) & ~(padding_mask)
};
/*** proc re_is_set_member *********************************************
Forward declaration: we'll need this one later...
***********************************************************************/
template<class charT, class traits>
struct regex_data;
template <class iterator, class charT, class traits_type, class char_classT>
iterator BOOST_REGEX_CALL re_is_set_member(iterator next,
iterator last,
const re_set_long<char_classT>* set_,
const regex_data<charT, traits_type>& e, bool icase);
} // namespace re_detail
} // namespace boost
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
#endif