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matcher.cpp
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/******************************************************************************\
* Copyright (c) 2016, Robert van Engelen, Genivia Inc. All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions are met: *
* *
* (1) Redistributions of source code must retain the above copyright notice, *
* this list of conditions and the following disclaimer. *
* *
* (2) Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* (3) The name of the author may not be used to endorse or promote products *
* derived from this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO *
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, *
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR *
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
\******************************************************************************/
/**
@file matcher.cpp regex engine
@brief RE/flex matcher engine
@author Robert van Engelen - [email protected]
@copyright (c) 2016-2025, Robert van Engelen, Genivia Inc. All rights reserved.
@copyright (c) BSD-3 License - see LICENSE.txt
*/
#include <reflex/matcher.h>
namespace reflex {
/// Returns true if input matched the pattern using method Const::SCAN, Const::FIND, Const::SPLIT, or Const::MATCH.
size_t Matcher::match(Method method)
{
DBGLOG("BEGIN Matcher::match()");
reset_text();
len_ = 0; // split text length starts with 0
size_t retry = 0; // retry regex match at lookback positions for predicted matches
if (method == Const::FIND)
{
// advance to find a possible match at or after cur in the buffer
txt_ = buf_ + cur_;
if ((this->*adv_)(cur_))
{
if (pat_->lbk_ > 0)
{
// go back over lookback chars (never includes \n) from cur-1 back to txt (at most)
const char *s = buf_ + cur_;
if (s > txt_)
{
size_t n = std::min<size_t>(pat_->lbk_ == 0xffff ? SIZE_MAX : pat_->lbk_, s - txt_);
while (n-- > 0 && pat_->cbk_.test(static_cast<unsigned char>(*--s)))
++retry;
cur_ -= retry;
// don't retry at minimal look back distances that are too short for pattern to match
if (retry > pat_->lbm_)
retry -= pat_->lbm_;
else
retry = 0;
}
}
else if (pat_->one_)
{
// one string match, no need to perform a regex match
size_t k = cur_ + pat_->len_;
int ch = k < end_ ? static_cast<unsigned char>(buf_[k]) : EOF;
if (!opt_.W || (at_wb() && (at_end() || at_we(ch, k))))
{
txt_ = buf_ + cur_;
len_ = pat_->len_;
set_current(k);
return cap_ = 1;
}
}
}
set_current(cur_);
}
scan:
txt_ = buf_ + cur_;
#if !defined(WITH_NO_INDENT)
mrk_ = false;
ind_ = pos_; // ind scans input in buf[] in newline() up to pos - 1
col_ = 0; // count columns for indent matching
#endif
find:
int ch = got_;
bool bol = at_bol(); // at begin of line?
#if !defined(WITH_NO_CODEGEN)
if (pat_->fsm_ != NULL)
fsm_.ch = ch;
#endif
#if !defined(WITH_NO_INDENT)
redo:
#endif
lap_.resize(0);
cap_ = 0;
bool nul = method == Const::MATCH;
if (!opt_.W || at_wb())
{
// skip to next line and keep searching if matching on anchor ^ and not at begin of line
if (method == Const::FIND && pat_->bol_ && !bol)
if (skip('\n'))
goto scan;
#if !defined(WITH_NO_CODEGEN)
if (pat_->fsm_ != NULL)
{
DBGLOG("FSM code %p", pat_->fsm_);
fsm_.bol = bol;
fsm_.nul = nul;
pat_->fsm_(*this);
nul = fsm_.nul;
ch = fsm_.ch;
}
else
#endif
if (pat_->opc_ != NULL)
{
const Pattern::Opcode *pc = pat_->opc_;
Pattern::Index back = Pattern::Const::IMAX; // where to jump back to when backtracking over meta edges
size_t bpos = 0; // backtrack position in the input
while (true)
{
Pattern::Index jump;
Pattern::Opcode opcode = *pc;
DBGLOG("Fetch: code[%zu] = 0x%08X", pc - pat_->opc_, opcode);
if (!Pattern::is_opcode_goto(opcode))
{
switch (opcode >> 24)
{
case 0xfe: // TAKE
{
int c;
if (!opt_.W || (c = peek(), at_we(c, pos_)))
{
cap_ = Pattern::long_index_of(opcode);
DBGLOG("Take: cap = %zu", cap_);
cur_ = pos_;
}
}
++pc;
continue;
case 0xfd: // REDO
cap_ = Const::REDO;
DBGLOG("Redo");
cur_ = pos_;
++pc;
continue;
case 0xfc: // TAIL
{
Pattern::Lookahead la = Pattern::lookahead_of(opcode);
DBGLOG("Tail: %u", la);
if (lap_.size() > la && lap_[la] >= 0)
cur_ = txt_ - buf_ + static_cast<size_t>(lap_[la]); // mind the (new) gap
++pc;
continue;
}
case 0xfb: // HEAD
{
Pattern::Lookahead la = Pattern::lookahead_of(opcode);
DBGLOG("Head: lookahead[%u] = %zu", la, pos_ - (txt_ - buf_));
if (lap_.size() <= la)
lap_.resize(la + 1, -1);
lap_[la] = static_cast<int>(pos_ - (txt_ - buf_)); // mind the gap
++pc;
continue;
}
#if !defined(WITH_NO_INDENT)
case Pattern::META_DED - Pattern::META_MIN:
if (ded_ > 0)
{
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(pc[1]);
DBGLOG("Dedent ded = %zu", ded_); // unconditional dedent matching \j
nul = true;
pc = pat_->opc_ + jump;
continue;
}
#endif
}
if (ch == EOF)
break;
ch = get();
DBGLOG("Get: ch = %d", ch);
// count down to halt cycling on lone meta edges in repetitions, 5 should suffice
int metas = 5;
// to jump to longest sequence of matching metas
jump = Pattern::Const::IMAX;
while (true)
{
if (jump == Pattern::Const::IMAX || back == Pattern::Const::IMAX)
{
if (!Pattern::is_opcode_goto(opcode))
{
// we no longer have to pass through all if jump and back are set
switch (opcode >> 24)
{
case 0xfe: // TAKE
if (!opt_.W || at_we(ch, pos_ - 1))
{
cap_ = Pattern::long_index_of(opcode);
DBGLOG("Take: cap = %zu", cap_);
cur_ = pos_;
if (ch != EOF)
--cur_; // must unget one char
}
opcode = *++pc;
continue;
case 0xfd: // REDO
cap_ = Const::REDO;
DBGLOG("Redo");
cur_ = pos_;
if (ch != EOF)
--cur_; // must unget one char
opcode = *++pc;
continue;
case 0xfc: // TAIL
{
Pattern::Lookahead la = Pattern::lookahead_of(opcode);
DBGLOG("Tail: %u", la);
if (lap_.size() > la && lap_[la] >= 0)
cur_ = txt_ - buf_ + static_cast<size_t>(lap_[la]); // mind the (new) gap
opcode = *++pc;
continue;
}
case 0xfb: // HEAD
opcode = *++pc;
continue;
#if !defined(WITH_NO_INDENT)
case Pattern::META_DED - Pattern::META_MIN:
DBGLOG("DED? %d", ch);
if (jump == Pattern::Const::IMAX && back == Pattern::Const::IMAX && bol && dedent())
{
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_IND - Pattern::META_MIN:
DBGLOG("IND? %d", ch);
if (jump == Pattern::Const::IMAX && back == Pattern::Const::IMAX && bol && indent())
{
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_UND - Pattern::META_MIN:
DBGLOG("UND");
if (mrk_)
{
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
mrk_ = false;
ded_ = 0;
opcode = *++pc;
continue;
#endif
case Pattern::META_EOB - Pattern::META_MIN:
DBGLOG("EOB? %d", ch);
if (metas > 0 && jump == Pattern::Const::IMAX && ch == EOF)
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_BOB - Pattern::META_MIN:
DBGLOG("BOB? %d", at_bob());
if (metas > 0 && jump == Pattern::Const::IMAX && at_bob())
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_EOL - Pattern::META_MIN:
DBGLOG("EOL? %d", ch);
if (metas > 0 && jump == Pattern::Const::IMAX &&
(ch == EOF || ch == '\n' || (ch == '\r' && peek() == '\n')))
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_BOL - Pattern::META_MIN:
DBGLOG("BOL? %d", bol);
if (metas > 0 && jump == Pattern::Const::IMAX && bol)
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_EWE - Pattern::META_MIN:
DBGLOG("EWE? %d", at_ewe(ch));
if (metas > 0 && jump == Pattern::Const::IMAX && at_ewe(ch))
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_BWE - Pattern::META_MIN:
DBGLOG("BWE? %d", at_bwe(ch));
if (metas > 0 && jump == Pattern::Const::IMAX && at_bwe(ch))
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_EWB - Pattern::META_MIN:
DBGLOG("EWB? %d", at_ewb());
if (metas > 0 && jump == Pattern::Const::IMAX && at_ewb())
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_BWB - Pattern::META_MIN:
DBGLOG("BWB? %d", at_bwb());
if (metas > 0 && jump == Pattern::Const::IMAX && at_bwb())
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_NWE - Pattern::META_MIN:
DBGLOG("NWE? %d", at_nwe(ch));
if (metas > 0 && jump == Pattern::Const::IMAX && at_nwe(ch))
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_NWB - Pattern::META_MIN:
DBGLOG("NWB? %d", at_nwb());
if (metas > 0 && jump == Pattern::Const::IMAX && at_nwb())
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_WBE - Pattern::META_MIN:
DBGLOG("WBE? %d", at_wbe(ch));
if (metas > 0 && jump == Pattern::Const::IMAX && at_wbe(ch))
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case Pattern::META_WBB - Pattern::META_MIN:
DBGLOG("WBB? %d", at_wbb());
if (metas > 0 && jump == Pattern::Const::IMAX && at_wbb())
{
--metas;
jump = Pattern::index_of(opcode);
if (jump == Pattern::Const::LONG)
jump = Pattern::long_index_of(*++pc);
}
opcode = *++pc;
continue;
case 0xff: // LONG
opcode = *++pc;
continue;
}
}
else if (ch != EOF && !Pattern::is_opcode_halt(opcode))
{
if (jump == Pattern::Const::IMAX)
break;
if (back == Pattern::Const::IMAX)
{
back = static_cast<Pattern::Index>(pc - pat_->opc_);
bpos = pos_ - (txt_ - buf_) - 1;
DBGLOG("Backtrack point: back = %u pos = %zu", back, bpos);
}
}
}
if (jump == Pattern::Const::IMAX)
{
if (back != Pattern::Const::IMAX && bpos + 1 == pos_ - (txt_ - buf_))
{
pc = pat_->opc_ + back;
opcode = *pc;
DBGLOG("Backtrack 1: back = %u pos = %zu ch = %d", back, pos_, ch);
back = Pattern::Const::IMAX;
}
break;
}
if (back == static_cast<Pattern::Index>(pc - pat_->opc_))
{
bpos = pos_ - (txt_ - buf_) - 1;
DBGLOG("Backtrack update point: back = %u pos = %zu", back, bpos);
}
DBGLOG("Try jump = %u", jump);
pc = pat_->opc_ + jump;
opcode = *pc;
jump = Pattern::Const::IMAX;
}
if (ch == EOF)
break;
}
else
{
if (Pattern::is_opcode_halt(opcode))
{
if (back != Pattern::Const::IMAX)
{
pos_ = (txt_ - buf_) + bpos;
pc = pat_->opc_ + back;
DBGLOG("Backtrack 2: back = %u pos = %zu ch = %d", back, pos_, ch);
back = Pattern::Const::IMAX;
continue;
}
break;
}
if (ch == EOF)
break;
ch = get();
DBGLOG("Get: ch = %d (0x%x) at pos %zu", ch, ch, pos_ - 1);
if (ch == EOF)
break;
}
Pattern::Opcode lo = ch << 24;
Pattern::Opcode hi = lo | 0x00ffffff;
unrolled:
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
if (hi < opcode || lo > (opcode << 8))
{
opcode = *++pc;
goto unrolled;
}
}
}
}
}
}
}
}
jump = Pattern::index_of(opcode);
if (jump == 0)
{
// loop back to start state w/o full match: advance to avoid backtracking
if (cap_ == 0 && method == Const::FIND)
{
if (cur_ + 1 == pos_)
{
// matched one char in a loop, do not backtrack here
++cur_;
if (retry > 0)
--retry;
}
else
{
// check each char in buf_[cur_+1..pos_-1] if it is a starting char, if not then increase cur_
while (cur_ + 1 < pos_ && !pat_->fst_.test(static_cast<uint8_t>(buf_[cur_ + 1])))
{
++cur_;
if (retry > 0)
--retry;
}
}
}
}
else if (jump >= Pattern::Const::LONG)
{
if (jump == Pattern::Const::HALT)
{
if (back != Pattern::Const::IMAX)
{
pc = pat_->opc_ + back;
pos_ = (txt_ - buf_) + bpos;
DBGLOG("Backtrack 3: back = %u pos = %zu ch = %d", back, pos_, ch);
back = Pattern::Const::IMAX;
continue;
}
break;
}
jump = Pattern::long_index_of(pc[1]);
}
pc = pat_->opc_ + jump;
}
}
}
#if !defined(WITH_NO_INDENT)
if (mrk_ && cap_ != Const::REDO)
{
if (col_ > 0 && (tab_.empty() || tab_.back() < col_))
{
DBGLOG("Set new stop: tab_[%zu] = %zu", tab_.size(), col_);
tab_.push_back(col_);
}
else if (!tab_.empty() && tab_.back() > col_)
{
size_t n;
for (n = tab_.size() - 1; n > 0; --n)
if (tab_.at(n - 1) <= col_)
break;
ded_ += tab_.size() - n;
DBGLOG("Dedents: ded = %zu tab_ = %zu", ded_, tab_.size());
tab_.resize(n);
// adjust stop when indents are not aligned (Python would give an error though)
if (n > 0)
tab_.back() = col_;
}
}
if (ded_ > 0)
{
DBGLOG("Dedents: ded = %zu", ded_);
if (col_ == 0 && bol)
{
ded_ += tab_.size();
tab_.resize(0);
DBGLOG("Rescan for pending dedents: ded = %zu", ded_);
pos_ = ind_;
// avoid looping, match \j exactly
bol = false;
goto redo;
}
--ded_;
}
#endif
if (method == Const::SPLIT)
{
DBGLOG("Split: len = %zu cap = %zu cur = %zu pos = %zu end = %zu txt-buf = %zu eob = %d got = %d", len_, cap_, cur_, pos_, end_, txt_-buf_, (int)eof_, got_);
if (cap_ == 0 || (cur_ == static_cast<size_t>(txt_ - buf_) && !at_bob()))
{
if (!hit_end() && (txt_ + len_ < buf_ + end_ || peek() != EOF))
{
++len_;
DBGLOG("Split continue: len = %zu", len_);
set_current(++cur_);
goto find;
}
if (got_ != Const::EOB)
cap_ = Const::EMPTY;
else
cap_ = 0;
set_current(end_);
got_ = Const::EOB;
DBGLOG("Split at eof: cap = %zu txt = '%s' len = %zu", cap_, std::string(txt_, len_).c_str(), len_);
DBGLOG("END Matcher::match()");
return cap_;
}
if (cur_ == 0 && at_bob() && at_end())
{
cap_ = Const::EMPTY;
got_ = Const::EOB;
}
else
{
set_current(cur_);
}
DBGLOG("Split: txt = '%s' len = %zu", std::string(txt_, len_).c_str(), len_);
DBGLOG("END Matcher::match()");
return cap_;
}
if (cap_ == 0)
{
if (method == Const::FIND)
{
if (!at_end())
{
// when looking back from a predicted match, advance by one position and retry a match
if (retry > 0)
{
--retry;
set_current(++cur_);
DBGLOG("Find: try next pos %zu", cur_);
goto scan;
}
if (cur_ < pos_) // if we didn't fail on META alone
{
if ((this->*adv_)(cur_ + 1))
{
if (pat_->lbk_ > 0)
{
// go back and retry matching over lookback chars (never includes \n) from cur-1 to txt+1 (at most)
const char *s = buf_ + cur_;
if (s > txt_ + 1)
{
size_t n = std::min<size_t>(pat_->lbk_ == 0xffff ? SIZE_MAX : pat_->lbk_, s - txt_ - 1);
while (n-- > 0 && pat_->cbk_.test(static_cast<unsigned char>(*--s)))
++retry;
cur_ -= retry;
// don't retry at minimal look back distances that are too short for pattern to match
if (retry > pat_->lbm_)
retry -= pat_->lbm_;
else
retry = 0;
}
set_current(cur_);
DBGLOG("Find: look back %zu to pos %zu", retry, cur_);
goto scan;
}
// if not one string match then perform a regex match, else we're done
if (!pat_->one_)
goto scan;
size_t k = cur_ + pat_->len_;
ch = k < end_ ? static_cast<unsigned char>(buf_[k]) : EOF;
if (opt_.W && (!at_wb() || !(at_end() || at_we(ch, k))))
goto scan;
txt_ = buf_ + cur_;
len_ = pat_->len_;
set_current(k);
return cap_ = 1;
}
}
}
txt_ = buf_ + cur_;
}
else
{
// SCAN and MATCH: no match: backup to begin of unmatched text to report as error
cur_ = txt_ - buf_;
}
}
len_ = cur_ - (txt_ - buf_);
if (len_ == 0 && !nul)
{
DBGLOG("Empty or no match cur = %zu pos = %zu end = %zu", cur_, pos_, end_);
pos_ = cur_;
if (at_end())
{
set_current(cur_);
DBGLOG("Reject empty match at EOF");
cap_ = 0;
}
else if (method == Const::FIND)
{
DBGLOG("Reject empty match and continue?");
// allow FIND with "N" to match an empty line, with ^$ etc.
if (cap_ == 0 || !opt_.N)
{
// if we found an empty match, we keep looking for non-empty matches when "N" is off
if (cap_ != 0)
{
// note that lbk is zero (no lookback), because we can't make a DFA cut for empty-matching patterns
if ((this->*adv_)(cur_ + 1))
goto scan;
set_current(++cur_);
// at end of input, no matches remain
cap_ = 0;
}
else
{
// advance one char to keep searching
set_current(++cur_);
goto scan;
}
}
else
{
// advance one char to keep searching at the next character position when we return
set_current(++cur_);
DBGLOG("Accept empty match");
}
}
else
{
set_current(cur_);
DBGLOG("Reject empty match");
cap_ = 0;
}
}
else if (len_ == 0 && cur_ == end_)
{
DBGLOG("Hit end: got = %d", got_);
if (cap_ == Const::REDO && !opt_.A)
cap_ = 0;
}
else
{
set_current(cur_);
if (len_ > 0 && cap_ == Const::REDO && !opt_.A)
{
DBGLOG("Ignore accept and continue: len = %zu", len_);
len_ = 0;
if (method != Const::MATCH)
goto scan;
cap_ = 0;
}
}
DBGLOG("Return: cap = %zu txt = '%s' len = %zu pos = %zu got = %d", cap_, std::string(txt_, len_).c_str(), len_, pos_, got_);
DBGLOG("END match()");
return cap_;
}
// expand code for all pin minimal cases
#define INIT_ADV_PAT_PIN_CASE(PIN) \
switch (pat_->min_) \
{ \
case 0: \
case 1: \
adv_ = &Matcher::advance_pattern_pin##PIN##_one; \
break; \
case 2: \
case 3: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pma; \
break; \
case 4: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pmh<4>; \
break; \
case 5: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pmh<5>; \
break; \
case 6: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pmh<6>; \
break; \
case 7: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pmh<7>; \
break; \
case 8: \
adv_ = &Matcher::advance_pattern_pin##PIN##_pmh<8>; \
break; \
}
// in init_advance(): select advance_pattern_min1() or advance_pattern_pma() based on the machine, heuristically
#if defined(HAVE_AVX512BW) || defined(HAVE_AVX2) || defined(HAVE_SSE2)
# define MAX_PATTERN_MIN1_NPY 33
# define MAX_PATTERN_MIN2_NPY 36
# define MAX_PATTERN_MIN3_NPY 47
#elif defined(HAVE_NEON) && defined(__aarch64__)
# define MAX_PATTERN_MIN1_NPY 30
# define MAX_PATTERN_MIN2_NPY 24
# define MAX_PATTERN_MIN3_NPY 36
#else
# define MAX_PATTERN_MIN1_NPY 50
# define MAX_PATTERN_MIN2_NPY 56
# define MAX_PATTERN_MIN3_NPY 56
#endif
/// Initialize specialized pattern search methods to advance the engine to a possible match
void Matcher::init_advance()
{
adv_ = &Matcher::advance_none;
if (pat_ == NULL)
return;
if (pat_->len_ == 0)
{
if (pat_->min_ == 0 && opt_.N)
return;
switch (pat_->pin_)
{
case 1:
switch (pat_->min_)
{
case 0:
case 1:
adv_ = &Matcher::advance_pattern_pin1_one;
break;
case 2:
case 3:
adv_ = &Matcher::advance_pattern_pin1_pma;
break;
case 4:
adv_ = &Matcher::advance_pattern_pin1_pmh<4>;
break;
case 5:
adv_ = &Matcher::advance_pattern_pin1_pmh<5>;
break;
case 6:
adv_ = &Matcher::advance_pattern_pin1_pmh<6>;
break;
case 7:
adv_ = &Matcher::advance_pattern_pin1_pmh<7>;
break;
case 8:
adv_ = &Matcher::advance_pattern_pin1_pmh<8>;
break;
}
break;
#if defined(HAVE_AVX512BW) || defined(HAVE_AVX2) || defined(HAVE_SSE2) || defined(HAVE_NEON)
case 2:
INIT_ADV_PAT_PIN_CASE(2);
break;
case 3:
INIT_ADV_PAT_PIN_CASE(3);
break;
case 4:
INIT_ADV_PAT_PIN_CASE(4);
break;
case 5:
INIT_ADV_PAT_PIN_CASE(5);
break;
case 6:
INIT_ADV_PAT_PIN_CASE(6);
break;
case 7:
INIT_ADV_PAT_PIN_CASE(7);
break;
case 8:
INIT_ADV_PAT_PIN_CASE(8);
break;
#endif
default:
switch (pat_->min_)
{
case 0:
case 1:
if (pat_->npy_ <= MAX_PATTERN_MIN1_NPY)
adv_ = &Matcher::advance_pattern_min1;
else
adv_ = &Matcher::advance_pattern_pma;
break;
case 2:
if (pat_->npy_ <= MAX_PATTERN_MIN2_NPY)
adv_ = &Matcher::advance_pattern_min2;
else
adv_ = &Matcher::advance_pattern_pma;
break;
case 3:
if (pat_->npy_ <= MAX_PATTERN_MIN3_NPY)
adv_ = &Matcher::advance_pattern_min3;
else
adv_ = &Matcher::advance_pattern_pma;
break;
case 4:
adv_ = &Matcher::advance_pattern_min4<4>;
break;
case 5:
adv_ = &Matcher::advance_pattern_min4<5>;
break;
case 6:
adv_ = &Matcher::advance_pattern_min4<6>;
break;
case 7:
adv_ = &Matcher::advance_pattern_min4<7>;
break;
case 8:
adv_ = &Matcher::advance_pattern_min4<8>;
break;
}
}
}
else if (pat_->len_ == 1)
{
if (pat_->min_ == 0)
adv_ = &Matcher::advance_char;
else if (pat_->min_ < 4)
adv_ = &Matcher::advance_char_pma;
else
adv_ = &Matcher::advance_char_pmh;
}
else if (pat_->len_ == 2)
{
if (pat_->min_ == 0)
adv_ = &Matcher::advance_chars<2>;
else if (pat_->min_ < 4)
adv_ = &Matcher::advance_chars_pma<2>;
else
adv_ = &Matcher::advance_chars_pmh<2>;
}
else if (pat_->len_ == 3)
{
if (pat_->min_ == 0)
adv_ = &Matcher::advance_chars<3>;
else if (pat_->min_ < 4)
adv_ = &Matcher::advance_chars_pma<3>;
else
adv_ = &Matcher::advance_chars_pmh<3>;
}
else if (pat_->bmd_ == 0)
{
if (pat_->min_ >= 4)
adv_ = &Matcher::advance_string_pmh;
else if (pat_->min_ > 0)
adv_ = &Matcher::advance_string_pma;
else
adv_ = &Matcher::advance_string;
}
else
{
if (pat_->min_ >= 4)
adv_ = &Matcher::advance_string_bm_pmh;
else if (pat_->min_ > 0)
adv_ = &Matcher::advance_string_bm_pma;
else
adv_ = &Matcher::advance_string_bm;
}
#if defined(HAVE_AVX512BW) || defined(HAVE_AVX2)
// AVX2 runtime optimized function callback overrides
if (have_HW_AVX2())
simd_init_advance_avx2();
#endif
#if defined(HAVE_AVX512BW) && (!defined(_MSC_VER) || defined(_WIN64))
// AVX512BW runtime optimized function callback overrides
if (have_HW_AVX512BW())
simd_init_advance_avx512bw();
#endif
}
/// Default method is none (unset)
bool Matcher::advance_none(size_t)
{
return false;
}
/// My homegrown "needle search" method when needle pin=1 and min=0 or 1 therefore lcp=0
bool Matcher::advance_pattern_pin1_one(size_t loc)
{
const char *chr = pat_->chr_;
const char chr0 = chr[0];
while (true)
{
const char *s = buf_ + loc;
const char *e = buf_ + end_;
if (s < e && (s = static_cast<const char*>(std::memchr(s, chr0, e - s))) != NULL)
{
loc = s - buf_;
if (s > e - 4 || pat_->predict_match(s))
{
set_current(loc);
return true;
}
++loc;
}
else
{
loc = e - buf_;
set_current_and_peek_more(loc);
loc = cur_;
if (loc + 1 > end_ && eof_)
return false;
}
}
}
/// My homegrown "needle search" method when needle pin=1 and min=2 or 3
bool Matcher::advance_pattern_pin1_pma(size_t loc)
{
const char *chr = pat_->chr_;
const size_t min = pat_->min_;
const uint16_t lcp = pat_->lcp_;
const uint16_t lcs = pat_->lcs_;
const char chr0 = chr[0];
const char chr1 = chr[1];