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notepad-plus-plus/boostregex/boost/regex/v5/perl_matcher_non_recursive.hpp

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/*
*
* Copyright (c) 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 perl_matcher_common.cpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Definitions of perl_matcher member functions that are
* specific to the non-recursive implementation.
*/
#ifndef BOOST_REGEX_V5_PERL_MATCHER_NON_RECURSIVE_HPP
#define BOOST_REGEX_V5_PERL_MATCHER_NON_RECURSIVE_HPP
#include <boost/regex/v5/mem_block_cache.hpp>
#ifdef BOOST_REGEX_MSVC
# pragma warning(push)
# pragma warning(disable: 4706 4459)
#if BOOST_REGEX_MSVC < 1910
#pragma warning(disable:4800)
#endif
#endif
namespace boost{
namespace BOOST_REGEX_DETAIL_NS{
template <class T>
inline void inplace_destroy(T* p)
{
(void)p; // warning suppression
p->~T();
}
struct saved_state
{
union{
unsigned int state_id;
// this padding ensures correct alignment on 64-bit platforms:
std::size_t padding1;
std::ptrdiff_t padding2;
void* padding3;
};
saved_state(unsigned i) : state_id(i) {}
};
template <class BidiIterator>
struct saved_matched_paren : public saved_state
{
int index;
sub_match<BidiIterator> sub;
saved_matched_paren(int i, const sub_match<BidiIterator>& s) : saved_state(1), index(i), sub(s){}
};
template <class BidiIterator>
struct saved_position : public saved_state
{
const re_syntax_base* pstate;
BidiIterator position;
saved_position(const re_syntax_base* ps, BidiIterator pos, int i) : saved_state(i), pstate(ps), position(pos){}
};
template <class BidiIterator>
struct saved_assertion : public saved_position<BidiIterator>
{
bool positive;
saved_assertion(bool p, const re_syntax_base* ps, BidiIterator pos)
: saved_position<BidiIterator>(ps, pos, saved_type_assertion), positive(p){}
};
template <class BidiIterator>
struct saved_repeater : public saved_state
{
repeater_count<BidiIterator> count;
saved_repeater(int i, repeater_count<BidiIterator>** s, BidiIterator start, int current_recursion_id)
: saved_state(saved_state_repeater_count), count(i, s, start, current_recursion_id){}
};
struct saved_extra_block : public saved_state
{
saved_state *base, *end;
saved_extra_block(saved_state* b, saved_state* e)
: saved_state(saved_state_extra_block), base(b), end(e) {}
};
struct save_state_init
{
saved_state** stack;
save_state_init(saved_state** base, saved_state** end)
: stack(base)
{
*base = static_cast<saved_state*>(get_mem_block());
*end = reinterpret_cast<saved_state*>(reinterpret_cast<char*>(*base)+BOOST_REGEX_BLOCKSIZE);
--(*end);
(void) new (*end)saved_state(0);
BOOST_REGEX_ASSERT(*end > *base);
}
~save_state_init()
{
put_mem_block(*stack);
*stack = 0;
}
};
template <class BidiIterator>
struct saved_single_repeat : public saved_state
{
std::size_t count;
const re_repeat* rep;
BidiIterator last_position;
saved_single_repeat(std::size_t c, const re_repeat* r, BidiIterator lp, int arg_id)
: saved_state(arg_id), count(c), rep(r), last_position(lp){}
};
template <class Results>
struct saved_recursion : public saved_state
{
saved_recursion(int idx, const re_syntax_base* p, Results* pr, Results* pr2)
: saved_state(14), recursion_id(idx), preturn_address(p), internal_results(*pr), prior_results(*pr2) {}
int recursion_id;
const re_syntax_base* preturn_address;
Results internal_results, prior_results;
};
struct saved_change_case : public saved_state
{
bool icase;
saved_change_case(bool c) : saved_state(18), icase(c) {}
};
struct incrementer
{
incrementer(unsigned* pu) : m_pu(pu) { ++*m_pu; }
~incrementer() { --*m_pu; }
bool operator > (unsigned i) { return *m_pu > i; }
private:
unsigned* m_pu;
};
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_all_states()
{
static matcher_proc_type const s_match_vtable[34] =
{
(&perl_matcher<BidiIterator, Allocator, traits>::match_startmark),
&perl_matcher<BidiIterator, Allocator, traits>::match_endmark,
&perl_matcher<BidiIterator, Allocator, traits>::match_literal,
&perl_matcher<BidiIterator, Allocator, traits>::match_start_line,
&perl_matcher<BidiIterator, Allocator, traits>::match_end_line,
&perl_matcher<BidiIterator, Allocator, traits>::match_wild,
&perl_matcher<BidiIterator, Allocator, traits>::match_match,
&perl_matcher<BidiIterator, Allocator, traits>::match_word_boundary,
&perl_matcher<BidiIterator, Allocator, traits>::match_within_word,
&perl_matcher<BidiIterator, Allocator, traits>::match_word_start,
&perl_matcher<BidiIterator, Allocator, traits>::match_word_end,
&perl_matcher<BidiIterator, Allocator, traits>::match_buffer_start,
&perl_matcher<BidiIterator, Allocator, traits>::match_buffer_end,
&perl_matcher<BidiIterator, Allocator, traits>::match_backref,
&perl_matcher<BidiIterator, Allocator, traits>::match_long_set,
&perl_matcher<BidiIterator, Allocator, traits>::match_set,
&perl_matcher<BidiIterator, Allocator, traits>::match_jump,
&perl_matcher<BidiIterator, Allocator, traits>::match_alt,
&perl_matcher<BidiIterator, Allocator, traits>::match_rep,
&perl_matcher<BidiIterator, Allocator, traits>::match_combining,
&perl_matcher<BidiIterator, Allocator, traits>::match_soft_buffer_end,
&perl_matcher<BidiIterator, Allocator, traits>::match_restart_continue,
// Although this next line *should* be evaluated at compile time, in practice
// some compilers (VC++) emit run-time initialisation which breaks thread
// safety, so use a dispatch function instead:
//(::boost::is_random_access_iterator<BidiIterator>::value ? &perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_fast : &perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_slow),
&perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_dispatch,
&perl_matcher<BidiIterator, Allocator, traits>::match_char_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::match_set_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::match_long_set_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::match_backstep,
&perl_matcher<BidiIterator, Allocator, traits>::match_assert_backref,
&perl_matcher<BidiIterator, Allocator, traits>::match_toggle_case,
&perl_matcher<BidiIterator, Allocator, traits>::match_recursion,
&perl_matcher<BidiIterator, Allocator, traits>::match_fail,
&perl_matcher<BidiIterator, Allocator, traits>::match_accept,
&perl_matcher<BidiIterator, Allocator, traits>::match_commit,
&perl_matcher<BidiIterator, Allocator, traits>::match_then,
};
incrementer inc(&m_recursions);
if(inc > 80)
raise_error(traits_inst, regex_constants::error_complexity);
push_recursion_stopper();
do{
while(pstate)
{
matcher_proc_type proc = s_match_vtable[pstate->type];
++state_count;
if(!(this->*proc)())
{
if(state_count > max_state_count)
raise_error(traits_inst, regex_constants::error_complexity);
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
bool successful_unwind = unwind(false);
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(!successful_unwind)
return m_recursive_result;
}
}
}while(unwind(true));
return m_recursive_result;
}
template <class BidiIterator, class Allocator, class traits>
void perl_matcher<BidiIterator, Allocator, traits>::extend_stack()
{
if(used_block_count)
{
--used_block_count;
saved_state* stack_base;
saved_state* backup_state;
stack_base = static_cast<saved_state*>(get_mem_block());
backup_state = reinterpret_cast<saved_state*>(reinterpret_cast<char*>(stack_base)+BOOST_REGEX_BLOCKSIZE);
saved_extra_block* block = static_cast<saved_extra_block*>(backup_state);
--block;
(void) new (block) saved_extra_block(m_stack_base, m_backup_state);
m_stack_base = stack_base;
m_backup_state = block;
}
else
raise_error(traits_inst, regex_constants::error_stack);
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_matched_paren(int index, const sub_match<BidiIterator>& sub)
{
//BOOST_REGEX_ASSERT(index);
saved_matched_paren<BidiIterator>* pmp = static_cast<saved_matched_paren<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_matched_paren<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_matched_paren<BidiIterator>(index, sub);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_case_change(bool c)
{
//BOOST_REGEX_ASSERT(index);
saved_change_case* pmp = static_cast<saved_change_case*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_change_case*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_change_case(c);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_recursion_stopper()
{
saved_state* pmp = m_backup_state;
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = m_backup_state;
--pmp;
}
(void) new (pmp)saved_state(saved_type_recurse);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_assertion(const re_syntax_base* ps, bool positive)
{
saved_assertion<BidiIterator>* pmp = static_cast<saved_assertion<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_assertion<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_assertion<BidiIterator>(positive, ps, position);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_alt(const re_syntax_base* ps)
{
saved_position<BidiIterator>* pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_position<BidiIterator>(ps, position, saved_state_alt);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_non_greedy_repeat(const re_syntax_base* ps)
{
saved_position<BidiIterator>* pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_position<BidiIterator>(ps, position, saved_state_non_greedy_long_repeat);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_repeater_count(int i, repeater_count<BidiIterator>** s)
{
saved_repeater<BidiIterator>* pmp = static_cast<saved_repeater<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_repeater<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_repeater<BidiIterator>(i, s, position, this->recursion_stack.empty() ? (INT_MIN + 3) : this->recursion_stack.back().idx);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_single_repeat(std::size_t c, const re_repeat* r, BidiIterator last_position, int state_id)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_single_repeat<BidiIterator>(c, r, last_position, state_id);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::push_recursion(int idx, const re_syntax_base* p, results_type* presults, results_type* presults2)
{
saved_recursion<results_type>* pmp = static_cast<saved_recursion<results_type>*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_recursion<results_type>*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_recursion<results_type>(idx, p, presults, presults2);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_toggle_case()
{
// change our case sensitivity:
push_case_change(this->icase);
this->icase = static_cast<const re_case*>(pstate)->icase;
pstate = pstate->next.p;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_startmark()
{
int index = static_cast<const re_brace*>(pstate)->index;
icase = static_cast<const re_brace*>(pstate)->icase;
switch(index)
{
case 0:
pstate = pstate->next.p;
break;
case -1:
case -2:
{
// forward lookahead assert:
const re_syntax_base* next_pstate = static_cast<const re_jump*>(pstate->next.p)->alt.p->next.p;
pstate = pstate->next.p->next.p;
push_assertion(next_pstate, index == -1);
break;
}
case -3:
{
// independent sub-expression, currently this is always recursive:
bool old_independent = m_independent;
m_independent = true;
const re_syntax_base* next_pstate = static_cast<const re_jump*>(pstate->next.p)->alt.p->next.p;
pstate = pstate->next.p->next.p;
bool r = false;
#if !defined(BOOST_NO_EXCEPTIONS)
try{
#endif
r = match_all_states();
if(!r && !m_independent)
{
// Must be unwinding from a COMMIT/SKIP/PRUNE and the independent
// sub failed, need to unwind everything else:
while (m_backup_state->state_id)
unwind(false);
return false;
}
#if !defined(BOOST_NO_EXCEPTIONS)
}
catch(...)
{
pstate = next_pstate;
// unwind all pushed states, apart from anything else this
// ensures that all the states are correctly destructed
// not just the memory freed.
while(unwind(true)) {}
throw;
}
#endif
pstate = next_pstate;
m_independent = old_independent;
#ifdef BOOST_REGEX_MATCH_EXTRA
if(r && (m_match_flags & match_extra))
{
//
// our captures have been stored in *m_presult
// we need to unpack them, and insert them
// back in the right order when we unwind the stack:
//
match_results<BidiIterator, Allocator> temp_match(*m_presult);
unsigned i;
for(i = 0; i < temp_match.size(); ++i)
(*m_presult)[i].get_captures().clear();
// match everything else:
#if !defined(BOOST_NO_EXCEPTIONS)
try{
#endif
r = match_all_states();
#if !defined(BOOST_NO_EXCEPTIONS)
}
catch(...)
{
pstate = next_pstate;
// unwind all pushed states, apart from anything else this
// ensures that all the states are correctly destructed
// not just the memory freed.
while(unwind(true)) {}
throw;
}
#endif
// now place the stored captures back:
for(i = 0; i < temp_match.size(); ++i)
{
typedef typename sub_match<BidiIterator>::capture_sequence_type seq;
seq& s1 = (*m_presult)[i].get_captures();
const seq& s2 = temp_match[i].captures();
s1.insert(
s1.end(),
s2.begin(),
s2.end());
}
}
#endif
return r;
}
case -4:
{
// conditional expression:
const re_alt* alt = static_cast<const re_alt*>(pstate->next.p);
BOOST_REGEX_ASSERT(alt->type == syntax_element_alt);
pstate = alt->next.p;
if(pstate->type == syntax_element_assert_backref)
{
if(!match_assert_backref())
pstate = alt->alt.p;
break;
}
else
{
// zero width assertion, have to match this recursively:
BOOST_REGEX_ASSERT(pstate->type == syntax_element_startmark);
bool negated = static_cast<const re_brace*>(pstate)->index == -2;
BidiIterator saved_position = position;
const re_syntax_base* next_pstate = static_cast<const re_jump*>(pstate->next.p)->alt.p->next.p;
pstate = pstate->next.p->next.p;
#if !defined(BOOST_NO_EXCEPTIONS)
try{
#endif
bool r = match_all_states();
position = saved_position;
if(negated)
r = !r;
if(r)
pstate = next_pstate;
else
pstate = alt->alt.p;
#if !defined(BOOST_NO_EXCEPTIONS)
}
catch(...)
{
pstate = next_pstate;
// unwind all pushed states, apart from anything else this
// ensures that all the states are correctly destructed
// not just the memory freed.
while(unwind(true)){}
throw;
}
#endif
break;
}
}
case -5:
{
push_matched_paren(0, (*m_presult)[0]);
m_presult->set_first(position, 0, true);
pstate = pstate->next.p;
break;
}
default:
{
BOOST_REGEX_ASSERT(index > 0);
if((m_match_flags & match_nosubs) == 0)
{
push_matched_paren(index, (*m_presult)[index]);
m_presult->set_first(position, index);
}
pstate = pstate->next.p;
break;
}
}
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_alt()
{
bool take_first, take_second;
const re_alt* jmp = static_cast<const re_alt*>(pstate);
// find out which of these two alternatives we need to take:
if(position == last)
{
take_first = jmp->can_be_null & mask_take;
take_second = jmp->can_be_null & mask_skip;
}
else
{
take_first = can_start(*position, jmp->_map, (unsigned char)mask_take);
take_second = can_start(*position, jmp->_map, (unsigned char)mask_skip);
}
if(take_first)
{
// we can take the first alternative,
// see if we need to push next alternative:
if(take_second)
{
push_alt(jmp->alt.p);
}
pstate = pstate->next.p;
return true;
}
if(take_second)
{
pstate = jmp->alt.p;
return true;
}
return false; // neither option is possible
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_rep()
{
#ifdef BOOST_REGEX_MSVC
#pragma warning(push)
#pragma warning(disable:4127 4244)
#endif
#ifdef BOOST_BORLANDC
#pragma option push -w-8008 -w-8066 -w-8004
#endif
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
// find out which of these two alternatives we need to take:
bool take_first, take_second;
if(position == last)
{
take_first = rep->can_be_null & mask_take;
take_second = rep->can_be_null & mask_skip;
}
else
{
take_first = can_start(*position, rep->_map, (unsigned char)mask_take);
take_second = can_start(*position, rep->_map, (unsigned char)mask_skip);
}
if((m_backup_state->state_id != saved_state_repeater_count)
|| (static_cast<saved_repeater<BidiIterator>*>(m_backup_state)->count.get_id() != rep->state_id)
|| (next_count->get_id() != rep->state_id))
{
// we're moving to a different repeat from the last
// one, so set up a counter object:
push_repeater_count(rep->state_id, &next_count);
}
//
// If we've had at least one repeat already, and the last one
// matched the NULL string then set the repeat count to
// maximum:
//
next_count->check_null_repeat(position, rep->max);
if(next_count->get_count() < rep->min)
{
// we must take the repeat:
if(take_first)
{
// increase the counter:
++(*next_count);
pstate = rep->next.p;
return true;
}
return false;
}
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
if(greedy)
{
// try and take the repeat if we can:
if((next_count->get_count() < rep->max) && take_first)
{
if(take_second)
{
// store position in case we fail:
push_alt(rep->alt.p);
}
// increase the counter:
++(*next_count);
pstate = rep->next.p;
return true;
}
else if(take_second)
{
pstate = rep->alt.p;
return true;
}
return false; // can't take anything, fail...
}
else // non-greedy
{
// try and skip the repeat if we can:
if(take_second)
{
if((next_count->get_count() < rep->max) && take_first)
{
// store position in case we fail:
push_non_greedy_repeat(rep->next.p);
}
pstate = rep->alt.p;
return true;
}
if((next_count->get_count() < rep->max) && take_first)
{
// increase the counter:
++(*next_count);
pstate = rep->next.p;
return true;
}
}
return false;
#ifdef BOOST_BORLANDC
#pragma option pop
#endif
#ifdef BOOST_REGEX_MSVC
#pragma warning(pop)
#endif
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_slow()
{
std::size_t count = 0;
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
re_syntax_base* psingle = rep->next.p;
// match compulsory repeats first:
while(count < rep->min)
{
pstate = psingle;
if(!match_wild())
return false;
++count;
}
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
if(greedy)
{
// repeat for as long as we can:
while(count < rep->max)
{
pstate = psingle;
if(!match_wild())
break;
++count;
}
// remember where we got to if this is a leading repeat:
if((rep->leading) && (count < rep->max))
restart = position;
// push backtrack info if available:
if(count - rep->min)
push_single_repeat(count, rep, position, saved_state_greedy_single_repeat);
// jump to next state:
pstate = rep->alt.p;
return true;
}
else
{
// non-greedy, push state and return true if we can skip:
if(count < rep->max)
push_single_repeat(count, rep, position, saved_state_rep_slow_dot);
pstate = rep->alt.p;
return (position == last) ? (rep->can_be_null & mask_skip) : can_start(*position, rep->_map, mask_skip);
}
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_fast()
{
if(m_match_flags & match_not_dot_null)
return match_dot_repeat_slow();
if((static_cast<const re_dot*>(pstate->next.p)->mask & match_any_mask) == 0)
return match_dot_repeat_slow();
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
std::size_t count = static_cast<std::size_t>((std::min)(static_cast<std::size_t>(std::distance(position, last)), greedy ? rep->max : rep->min));
if(rep->min > count)
{
position = last;
return false; // not enough text left to match
}
std::advance(position, count);
if(greedy)
{
if((rep->leading) && (count < rep->max))
restart = position;
// push backtrack info if available:
if(count - rep->min)
push_single_repeat(count, rep, position, saved_state_greedy_single_repeat);
// jump to next state:
pstate = rep->alt.p;
return true;
}
else
{
// non-greedy, push state and return true if we can skip:
if(count < rep->max)
push_single_repeat(count, rep, position, saved_state_rep_fast_dot);
pstate = rep->alt.p;
return (position == last) ? (rep->can_be_null & mask_skip) : can_start(*position, rep->_map, mask_skip);
}
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_char_repeat()
{
#ifdef BOOST_REGEX_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef BOOST_BORLANDC
#pragma option push -w-8008 -w-8066 -w-8004
#endif
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
BOOST_REGEX_ASSERT(1 == static_cast<const re_literal*>(rep->next.p)->length);
const char_type what = *reinterpret_cast<const char_type*>(static_cast<const re_literal*>(rep->next.p) + 1);
std::size_t count = 0;
//
// start by working out how much we can skip:
//
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
std::size_t desired = greedy ? rep->max : rep->min;
if(::boost::is_random_access_iterator<BidiIterator>::value)
{
BidiIterator end = position;
// Move end forward by "desired", preferably without using distance or advance if we can
// as these can be slow for some iterator types.
std::size_t len = (desired == (std::numeric_limits<std::size_t>::max)()) ? 0u : std::distance(position, last);
if(desired >= len)
end = last;
else
std::advance(end, desired);
BidiIterator origin(position);
while((position != end) && (traits_inst.translate(*position, icase) == what))
{
++position;
}
count = (unsigned)std::distance(origin, position);
}
else
{
while((count < desired) && (position != last) && (traits_inst.translate(*position, icase) == what))
{
++position;
++count;
}
}
if(count < rep->min)
return false;
if(greedy)
{
if((rep->leading) && (count < rep->max))
restart = position;
// push backtrack info if available:
if(count - rep->min)
push_single_repeat(count, rep, position, saved_state_greedy_single_repeat);
// jump to next state:
pstate = rep->alt.p;
return true;
}
else
{
// non-greedy, push state and return true if we can skip:
if(count < rep->max)
push_single_repeat(count, rep, position, saved_state_rep_char);
pstate = rep->alt.p;
return (position == last) ? (rep->can_be_null & mask_skip) : can_start(*position, rep->_map, mask_skip);
}
#ifdef BOOST_BORLANDC
#pragma option pop
#endif
#ifdef BOOST_REGEX_MSVC
#pragma warning(pop)
#endif
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_set_repeat()
{
#ifdef BOOST_REGEX_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef BOOST_BORLANDC
#pragma option push -w-8008 -w-8066 -w-8004
#endif
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
const unsigned char* map = static_cast<const re_set*>(rep->next.p)->_map;
std::size_t count = 0;
//
// start by working out how much we can skip:
//
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
std::size_t desired = greedy ? rep->max : rep->min;
if(::boost::is_random_access_iterator<BidiIterator>::value)
{
BidiIterator end = position;
// Move end forward by "desired", preferably without using distance or advance if we can
// as these can be slow for some iterator types.
std::size_t len = (desired == (std::numeric_limits<std::size_t>::max)()) ? 0u : std::distance(position, last);
if(desired >= len)
end = last;
else
std::advance(end, desired);
BidiIterator origin(position);
while((position != end) && map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
{
++position;
}
count = (unsigned)std::distance(origin, position);
}
else
{
while((count < desired) && (position != last) && map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
{
++position;
++count;
}
}
if(count < rep->min)
return false;
if(greedy)
{
if((rep->leading) && (count < rep->max))
restart = position;
// push backtrack info if available:
if(count - rep->min)
push_single_repeat(count, rep, position, saved_state_greedy_single_repeat);
// jump to next state:
pstate = rep->alt.p;
return true;
}
else
{
// non-greedy, push state and return true if we can skip:
if(count < rep->max)
push_single_repeat(count, rep, position, saved_state_rep_short_set);
pstate = rep->alt.p;
return (position == last) ? (rep->can_be_null & mask_skip) : can_start(*position, rep->_map, mask_skip);
}
#ifdef BOOST_BORLANDC
#pragma option pop
#endif
#ifdef BOOST_REGEX_MSVC
#pragma warning(pop)
#endif
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_long_set_repeat()
{
#ifdef BOOST_REGEX_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef BOOST_BORLANDC
#pragma option push -w-8008 -w-8066 -w-8004
#endif
typedef typename traits::char_class_type m_type;
const re_repeat* rep = static_cast<const re_repeat*>(pstate);
const re_set_long<m_type>* set = static_cast<const re_set_long<m_type>*>(pstate->next.p);
std::size_t count = 0;
//
// start by working out how much we can skip:
//
bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);
std::size_t desired = greedy ? rep->max : rep->min;
if(::boost::is_random_access_iterator<BidiIterator>::value)
{
BidiIterator end = position;
// Move end forward by "desired", preferably without using distance or advance if we can
// as these can be slow for some iterator types.
std::size_t len = (desired == (std::numeric_limits<std::size_t>::max)()) ? 0u : std::distance(position, last);
if(desired >= len)
end = last;
else
std::advance(end, desired);
BidiIterator origin(position);
while((position != end) && (position != re_is_set_member(position, last, set, re.get_data(), icase)))
{
++position;
}
count = (unsigned)std::distance(origin, position);
}
else
{
while((count < desired) && (position != last) && (position != re_is_set_member(position, last, set, re.get_data(), icase)))
{
++position;
++count;
}
}
if(count < rep->min)
return false;
if(greedy)
{
if((rep->leading) && (count < rep->max))
restart = position;
// push backtrack info if available:
if(count - rep->min)
push_single_repeat(count, rep, position, saved_state_greedy_single_repeat);
// jump to next state:
pstate = rep->alt.p;
return true;
}
else
{
// non-greedy, push state and return true if we can skip:
if(count < rep->max)
push_single_repeat(count, rep, position, saved_state_rep_long_set);
pstate = rep->alt.p;
return (position == last) ? (rep->can_be_null & mask_skip) : can_start(*position, rep->_map, mask_skip);
}
#ifdef BOOST_BORLANDC
#pragma option pop
#endif
#ifdef BOOST_REGEX_MSVC
#pragma warning(pop)
#endif
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_recursion()
{
BOOST_REGEX_ASSERT(pstate->type == syntax_element_recurse);
//
// See if we've seen this recursion before at this location, if we have then
// we need to prevent infinite recursion:
//
for(typename std::vector<recursion_info<results_type> >::reverse_iterator i = recursion_stack.rbegin(); i != recursion_stack.rend(); ++i)
{
if(i->idx == static_cast<const re_brace*>(static_cast<const re_jump*>(pstate)->alt.p)->index)
{
if(i->location_of_start == position)
return false;
break;
}
}
//
// Backup call stack:
//
push_recursion_pop();
//
// Set new call stack:
//
if(recursion_stack.capacity() == 0)
{
recursion_stack.reserve(50);
}
recursion_stack.push_back(recursion_info<results_type>());
recursion_stack.back().preturn_address = pstate->next.p;
recursion_stack.back().results = *m_presult;
pstate = static_cast<const re_jump*>(pstate)->alt.p;
recursion_stack.back().idx = static_cast<const re_brace*>(pstate)->index;
recursion_stack.back().location_of_start = position;
//if(static_cast<const re_recurse*>(pstate)->state_id > 0)
{
push_repeater_count(-(2 + static_cast<const re_brace*>(pstate)->index), &next_count);
}
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_endmark()
{
int index = static_cast<const re_brace*>(pstate)->index;
icase = static_cast<const re_brace*>(pstate)->icase;
if(index > 0)
{
if((m_match_flags & match_nosubs) == 0)
{
m_presult->set_second(position, index);
}
if(!recursion_stack.empty())
{
if(index == recursion_stack.back().idx)
{
pstate = recursion_stack.back().preturn_address;
*m_presult = recursion_stack.back().results;
push_recursion(recursion_stack.back().idx, recursion_stack.back().preturn_address, m_presult, &recursion_stack.back().results);
recursion_stack.pop_back();
push_repeater_count(-(2 + index), &next_count);
}
}
}
else if((index < 0) && (index != -4))
{
// matched forward lookahead:
pstate = 0;
return true;
}
pstate = pstate->next.p;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_match()
{
if(!recursion_stack.empty())
{
BOOST_REGEX_ASSERT(0 == recursion_stack.back().idx);
pstate = recursion_stack.back().preturn_address;
push_recursion(recursion_stack.back().idx, recursion_stack.back().preturn_address, m_presult, &recursion_stack.back().results);
*m_presult = recursion_stack.back().results;
recursion_stack.pop_back();
return true;
}
if((m_match_flags & match_not_null) && (position == (*m_presult)[0].first))
return false;
if((m_match_flags & match_all) && (position != last))
return false;
if((m_match_flags & regex_constants::match_not_initial_null) && (position == search_base))
return false;
m_presult->set_second(position);
pstate = 0;
m_has_found_match = true;
if((m_match_flags & match_posix) == match_posix)
{
m_result.maybe_assign(*m_presult);
if((m_match_flags & match_any) == 0)
return false;
}
#ifdef BOOST_REGEX_MATCH_EXTRA
if(match_extra & m_match_flags)
{
for(unsigned i = 0; i < m_presult->size(); ++i)
if((*m_presult)[i].matched)
((*m_presult)[i]).get_captures().push_back((*m_presult)[i]);
}
#endif
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_commit()
{
// Ideally we would just junk all the states that are on the stack,
// however we might not unwind correctly in that case, so for now,
// just mark that we don't backtrack into whatever is left (or rather
// we'll unwind it unconditionally without pausing to try other matches).
switch(static_cast<const re_commit*>(pstate)->action)
{
case commit_commit:
restart = last;
break;
case commit_skip:
if(base != position)
{
restart = position;
// Have to decrement restart since it will get incremented again later:
--restart;
}
break;
case commit_prune:
break;
}
saved_state* pmp = m_backup_state;
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = m_backup_state;
--pmp;
}
(void) new (pmp)saved_state(16);
m_backup_state = pmp;
pstate = pstate->next.p;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_then()
{
// Just leave a mark that we need to skip to next alternative:
saved_state* pmp = m_backup_state;
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = m_backup_state;
--pmp;
}
(void) new (pmp)saved_state(17);
m_backup_state = pmp;
pstate = pstate->next.p;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::skip_until_paren(int index, bool have_match)
{
while(pstate)
{
if(pstate->type == syntax_element_endmark)
{
if(static_cast<const re_brace*>(pstate)->index == index)
{
if(have_match)
return this->match_endmark();
pstate = pstate->next.p;
return true;
}
else
{
// Unenclosed closing ), occurs when (*ACCEPT) is inside some other
// parenthesis which may or may not have other side effects associated with it.
const re_syntax_base* sp = pstate;
match_endmark();
if(!pstate)
{
unwind(true);
// unwind may leave pstate NULL if we've unwound a forward lookahead, in which
// case just move to the next state and keep looking...
if (!pstate)
pstate = sp->next.p;
}
}
continue;
}
else if(pstate->type == syntax_element_match)
return true;
else if(pstate->type == syntax_element_startmark)
{
int idx = static_cast<const re_brace*>(pstate)->index;
pstate = pstate->next.p;
skip_until_paren(idx, false);
continue;
}
pstate = pstate->next.p;
}
return true;
}
/****************************************************************************
Unwind and associated procedures follow, these perform what normal stack
unwinding does in the recursive implementation.
****************************************************************************/
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind(bool have_match)
{
static unwind_proc_type const s_unwind_table[19] =
{
&perl_matcher<BidiIterator, Allocator, traits>::unwind_end,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_paren,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_stopper,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_assertion,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_alt,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_repeater_counter,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_extra_block,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_greedy_single_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_slow_dot_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_fast_dot_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_char_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_short_set_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_long_set_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_non_greedy_repeat,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_pop,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_commit,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_then,
&perl_matcher<BidiIterator, Allocator, traits>::unwind_case,
};
m_recursive_result = have_match;
m_unwound_lookahead = false;
m_unwound_alt = false;
unwind_proc_type unwinder;
bool cont;
//
// keep unwinding our stack until we have something to do:
//
do
{
unwinder = s_unwind_table[m_backup_state->state_id];
cont = (this->*unwinder)(m_recursive_result);
}while(cont);
//
// return true if we have more states to try:
//
return pstate ? true : false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_end(bool)
{
pstate = 0; // nothing left to search
return false; // end of stack nothing more to search
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_case(bool)
{
saved_change_case* pmp = static_cast<saved_change_case*>(m_backup_state);
icase = pmp->icase;
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_paren(bool have_match)
{
saved_matched_paren<BidiIterator>* pmp = static_cast<saved_matched_paren<BidiIterator>*>(m_backup_state);
// restore previous values if no match was found:
if(!have_match)
{
m_presult->set_first(pmp->sub.first, pmp->index, pmp->index == 0);
m_presult->set_second(pmp->sub.second, pmp->index, pmp->sub.matched, pmp->index == 0);
}
#ifdef BOOST_REGEX_MATCH_EXTRA
//
// we have a match, push the capture information onto the stack:
//
else if(pmp->sub.matched && (match_extra & m_match_flags))
((*m_presult)[pmp->index]).get_captures().push_back(pmp->sub);
#endif
// unwind stack:
m_backup_state = pmp+1;
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp);
return true; // keep looking
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_stopper(bool)
{
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(m_backup_state++);
pstate = 0; // nothing left to search
return false; // end of stack nothing more to search
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_assertion(bool r)
{
saved_assertion<BidiIterator>* pmp = static_cast<saved_assertion<BidiIterator>*>(m_backup_state);
pstate = pmp->pstate;
position = pmp->position;
bool result = (r == pmp->positive);
m_recursive_result = pmp->positive ? r : !r;
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
m_unwound_lookahead = true;
return !result; // return false if the assertion was matched to stop search.
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_alt(bool r)
{
saved_position<BidiIterator>* pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
if(!r)
{
pstate = pmp->pstate;
position = pmp->position;
}
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
m_unwound_alt = !r;
return r;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_repeater_counter(bool)
{
saved_repeater<BidiIterator>* pmp = static_cast<saved_repeater<BidiIterator>*>(m_backup_state);
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
return true; // keep looking
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_extra_block(bool)
{
++used_block_count;
saved_extra_block* pmp = static_cast<saved_extra_block*>(m_backup_state);
void* condemmed = m_stack_base;
m_stack_base = pmp->base;
m_backup_state = pmp->end;
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp);
put_mem_block(condemmed);
return true; // keep looking
}
template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::destroy_single_repeat()
{
saved_single_repeat<BidiIterator>* p = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(p++);
m_backup_state = p;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_greedy_single_repeat(bool r)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
BOOST_REGEX_ASSERT(rep->next.p != 0);
BOOST_REGEX_ASSERT(rep->alt.p != 0);
count -= rep->min;
if((m_match_flags & match_partial) && (position == last))
m_has_partial_match = true;
BOOST_REGEX_ASSERT(count);
position = pmp->last_position;
// backtrack till we can skip out:
do
{
--position;
--count;
++state_count;
}while(count && !can_start(*position, rep->_map, mask_skip));
// if we've hit base, destroy this state:
if(count == 0)
{
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count + rep->min;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_slow_dot_repeat(bool r)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
BOOST_REGEX_ASSERT(rep->type == syntax_element_dot_rep);
BOOST_REGEX_ASSERT(rep->next.p != 0);
BOOST_REGEX_ASSERT(rep->alt.p != 0);
BOOST_REGEX_ASSERT(rep->next.p->type == syntax_element_wild);
BOOST_REGEX_ASSERT(count < rep->max);
pstate = rep->next.p;
position = pmp->last_position;
if(position != last)
{
// wind forward until we can skip out of the repeat:
do
{
if(!match_wild())
{
// failed repeat match, discard this state and look for another:
destroy_single_repeat();
return true;
}
++count;
++state_count;
pstate = rep->next.p;
}while((count < rep->max) && (position != last) && !can_start(*position, rep->_map, mask_skip));
}
if(position == last)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(0 == (rep->can_be_null & mask_skip))
return true;
}
else if(count == rep->max)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_fast_dot_repeat(bool r)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
BOOST_REGEX_ASSERT(count < rep->max);
position = pmp->last_position;
if(position != last)
{
// wind forward until we can skip out of the repeat:
do
{
++position;
++count;
++state_count;
}while((count < rep->max) && (position != last) && !can_start(*position, rep->_map, mask_skip));
}
// remember where we got to if this is a leading repeat:
if((rep->leading) && (count < rep->max))
restart = position;
if(position == last)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(0 == (rep->can_be_null & mask_skip))
return true;
}
else if(count == rep->max)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_char_repeat(bool r)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
pstate = rep->next.p;
const char_type what = *reinterpret_cast<const char_type*>(static_cast<const re_literal*>(pstate) + 1);
position = pmp->last_position;
BOOST_REGEX_ASSERT(rep->type == syntax_element_char_rep);
BOOST_REGEX_ASSERT(rep->next.p != 0);
BOOST_REGEX_ASSERT(rep->alt.p != 0);
BOOST_REGEX_ASSERT(rep->next.p->type == syntax_element_literal);
BOOST_REGEX_ASSERT(count < rep->max);
if(position != last)
{
// wind forward until we can skip out of the repeat:
do
{
if(traits_inst.translate(*position, icase) != what)
{
// failed repeat match, discard this state and look for another:
destroy_single_repeat();
return true;
}
++count;
++ position;
++state_count;
pstate = rep->next.p;
}while((count < rep->max) && (position != last) && !can_start(*position, rep->_map, mask_skip));
}
// remember where we got to if this is a leading repeat:
if((rep->leading) && (count < rep->max))
restart = position;
if(position == last)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(0 == (rep->can_be_null & mask_skip))
return true;
}
else if(count == rep->max)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_short_set_repeat(bool r)
{
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
pstate = rep->next.p;
const unsigned char* map = static_cast<const re_set*>(rep->next.p)->_map;
position = pmp->last_position;
BOOST_REGEX_ASSERT(rep->type == syntax_element_short_set_rep);
BOOST_REGEX_ASSERT(rep->next.p != 0);
BOOST_REGEX_ASSERT(rep->alt.p != 0);
BOOST_REGEX_ASSERT(rep->next.p->type == syntax_element_set);
BOOST_REGEX_ASSERT(count < rep->max);
if(position != last)
{
// wind forward until we can skip out of the repeat:
do
{
if(!map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
{
// failed repeat match, discard this state and look for another:
destroy_single_repeat();
return true;
}
++count;
++ position;
++state_count;
pstate = rep->next.p;
}while((count < rep->max) && (position != last) && !can_start(*position, rep->_map, mask_skip));
}
// remember where we got to if this is a leading repeat:
if((rep->leading) && (count < rep->max))
restart = position;
if(position == last)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(0 == (rep->can_be_null & mask_skip))
return true;
}
else if(count == rep->max)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_long_set_repeat(bool r)
{
typedef typename traits::char_class_type m_type;
saved_single_repeat<BidiIterator>* pmp = static_cast<saved_single_repeat<BidiIterator>*>(m_backup_state);
// if we have a match, just discard this state:
if(r)
{
destroy_single_repeat();
return true;
}
const re_repeat* rep = pmp->rep;
std::size_t count = pmp->count;
pstate = rep->next.p;
const re_set_long<m_type>* set = static_cast<const re_set_long<m_type>*>(pstate);
position = pmp->last_position;
BOOST_REGEX_ASSERT(rep->type == syntax_element_long_set_rep);
BOOST_REGEX_ASSERT(rep->next.p != 0);
BOOST_REGEX_ASSERT(rep->alt.p != 0);
BOOST_REGEX_ASSERT(rep->next.p->type == syntax_element_long_set);
BOOST_REGEX_ASSERT(count < rep->max);
if(position != last)
{
// wind forward until we can skip out of the repeat:
do
{
if(position == re_is_set_member(position, last, set, re.get_data(), icase))
{
// failed repeat match, discard this state and look for another:
destroy_single_repeat();
return true;
}
++position;
++count;
++state_count;
pstate = rep->next.p;
}while((count < rep->max) && (position != last) && !can_start(*position, rep->_map, mask_skip));
}
// remember where we got to if this is a leading repeat:
if((rep->leading) && (count < rep->max))
restart = position;
if(position == last)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if((m_match_flags & match_partial) && (position == last) && (position != search_base))
m_has_partial_match = true;
if(0 == (rep->can_be_null & mask_skip))
return true;
}
else if(count == rep->max)
{
// can't repeat any more, remove the pushed state:
destroy_single_repeat();
if(!can_start(*position, rep->_map, mask_skip))
return true;
}
else
{
pmp->count = count;
pmp->last_position = position;
}
pstate = rep->alt.p;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_non_greedy_repeat(bool r)
{
saved_position<BidiIterator>* pmp = static_cast<saved_position<BidiIterator>*>(m_backup_state);
if(!r)
{
position = pmp->position;
pstate = pmp->pstate;
++(*next_count);
}
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
return r;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion(bool r)
{
// We are backtracking back inside a recursion, need to push the info
// back onto the recursion stack, and do so unconditionally, otherwise
// we can get mismatched pushes and pops...
saved_recursion<results_type>* pmp = static_cast<saved_recursion<results_type>*>(m_backup_state);
if (!r)
{
recursion_stack.push_back(recursion_info<results_type>());
recursion_stack.back().idx = pmp->recursion_id;
recursion_stack.back().preturn_address = pmp->preturn_address;
recursion_stack.back().results = pmp->prior_results;
recursion_stack.back().location_of_start = position;
*m_presult = pmp->internal_results;
}
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
return true;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_pop(bool r)
{
// Backtracking out of a recursion, we must pop state off the recursion
// stack unconditionally to ensure matched pushes and pops:
saved_state* pmp = static_cast<saved_state*>(m_backup_state);
if (!r && !recursion_stack.empty())
{
*m_presult = recursion_stack.back().results;
position = recursion_stack.back().location_of_start;
recursion_stack.pop_back();
}
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(pmp++);
m_backup_state = pmp;
return true;
}
template <class BidiIterator, class Allocator, class traits>
void perl_matcher<BidiIterator, Allocator, traits>::push_recursion_pop()
{
saved_state* pmp = static_cast<saved_state*>(m_backup_state);
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = static_cast<saved_state*>(m_backup_state);
--pmp;
}
(void) new (pmp)saved_state(15);
m_backup_state = pmp;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_commit(bool b)
{
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(m_backup_state++);
while(unwind(b) && !m_unwound_lookahead){}
if(m_unwound_lookahead && pstate)
{
//
// If we stop because we just unwound an assertion, put the
// commit state back on the stack again:
//
m_unwound_lookahead = false;
saved_state* pmp = m_backup_state;
--pmp;
if(pmp < m_stack_base)
{
extend_stack();
pmp = m_backup_state;
--pmp;
}
(void) new (pmp)saved_state(16);
m_backup_state = pmp;
}
// This prevents us from stopping when we exit from an independent sub-expression:
m_independent = false;
return false;
}
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::unwind_then(bool b)
{
// Unwind everything till we hit an alternative:
boost::BOOST_REGEX_DETAIL_NS::inplace_destroy(m_backup_state++);
bool result = false;
result = unwind(b);
while(result && !m_unwound_alt)
{
result = unwind(b);
}
// We're now pointing at the next alternative, need one more backtrack
// since *all* the other alternatives must fail once we've reached a THEN clause:
if(result && m_unwound_alt)
unwind(b);
return false;
}
} // namespace BOOST_REGEX_DETAIL_NS
} // namespace boost
#ifdef BOOST_REGEX_MSVC
# pragma warning(pop)
#endif
#endif
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