322 lines
12 KiB
C++
322 lines
12 KiB
C++
/*
|
|
*
|
|
* 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 BOOST_REGEX_DETAIL_NS{
|
|
|
|
/*** 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,
|
|
// a recursive expression:
|
|
syntax_element_recurse = syntax_element_toggle_case + 1,
|
|
// Verbs:
|
|
syntax_element_fail = syntax_element_recurse + 1,
|
|
syntax_element_accept = syntax_element_fail + 1,
|
|
syntax_element_commit = syntax_element_accept + 1,
|
|
syntax_element_then = syntax_element_commit + 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;
|
|
bool icase;
|
|
};
|
|
|
|
/*** 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
|
|
};
|
|
|
|
/*** struct re_recurse ************************************************
|
|
Recurse to a particular subexpression.
|
|
**********************************************************************/
|
|
struct re_recurse : public re_jump
|
|
{
|
|
int state_id; // identifier of first nested repeat within the recursion.
|
|
};
|
|
|
|
/*** struct re_commit *************************************************
|
|
Used for the PRUNE, SKIP and COMMIT verbs which basically differ only in what happens
|
|
if no match is found and we start searching forward.
|
|
**********************************************************************/
|
|
enum commit_type
|
|
{
|
|
commit_prune,
|
|
commit_skip,
|
|
commit_commit
|
|
};
|
|
struct re_commit : public re_syntax_base
|
|
{
|
|
commit_type action;
|
|
};
|
|
|
|
/*** 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 BOOST_REGEX_DETAIL_NS
|
|
|
|
} // 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
|
|
|
|
|