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/*
*
* Copyright (c) 2002
* Dr 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)
*
*/
#include <cassert>
#include <cfloat>
#include "regex_comparison.hpp"
#ifdef BOOST_HAS_PCRE
#include "pcre.h"
#include <boost/timer.hpp>
namespace pcr{
double time_match(const std::string& re, const std::string& text, bool icase)
{
pcre *ppcre;
const char *error;
int erroffset;
int what[50];
boost::timer tim;
int iter = 1;
int counter, repeats;
double result = 0;
double run;
if(0 == (ppcre = pcre_compile(re.c_str(), (icase ? PCRE_CASELESS | PCRE_ANCHORED | PCRE_DOTALL | PCRE_MULTILINE : PCRE_ANCHORED | PCRE_DOTALL | PCRE_MULTILINE),
&error, &erroffset, NULL)))
{
free(ppcre);
return -1;
}
pcre_extra *pe;
pe = pcre_study(ppcre, 0, &error);
if(error)
{
free(ppcre);
free(pe);
return -1;
}
do
{
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
erroffset = pcre_exec(ppcre, pe, text.c_str(), text.size(), 0, 0, what, sizeof(what)/sizeof(int));
}
result = tim.elapsed();
iter *= 2;
}while(result < 0.5);
iter /= 2;
// repeat test and report least value for consistency:
for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)
{
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
erroffset = pcre_exec(ppcre, pe, text.c_str(), text.size(), 0, 0, what, sizeof(what)/sizeof(int));
}
run = tim.elapsed();
result = (std::min)(run, result);
}
free(ppcre);
free(pe);
return result / iter;
}
double time_find_all(const std::string& re, const std::string& text, bool icase)
{
pcre *ppcre;
const char *error;
int erroffset;
int what[50];
boost::timer tim;
int iter = 1;
int counter, repeats;
double result = 0;
double run;
int exec_result;
int matches;
if(0 == (ppcre = pcre_compile(re.c_str(), (icase ? PCRE_CASELESS | PCRE_DOTALL | PCRE_MULTILINE : PCRE_DOTALL | PCRE_MULTILINE), &error, &erroffset, NULL)))
{
free(ppcre);
return -1;
}
pcre_extra *pe;
pe = pcre_study(ppcre, 0, &error);
if(error)
{
free(ppcre);
free(pe);
return -1;
}
do
{
int startoff;
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
matches = 0;
startoff = 0;
exec_result = pcre_exec(ppcre, pe, text.c_str(), text.size(), startoff, 0, what, sizeof(what)/sizeof(int));
while(exec_result >= 0)
{
++matches;
startoff = what[1];
exec_result = pcre_exec(ppcre, pe, text.c_str(), text.size(), startoff, 0, what, sizeof(what)/sizeof(int));
}
}
result = tim.elapsed();
iter *= 2;
}while(result < 0.5);
iter /= 2;
if(result >10)
return result / iter;
result = DBL_MAX;
// repeat test and report least value for consistency:
for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)
{
int startoff;
matches = 0;
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
matches = 0;
startoff = 0;
exec_result = pcre_exec(ppcre, pe, text.c_str(), text.size(), startoff, 0, what, sizeof(what)/sizeof(int));
while(exec_result >= 0)
{
++matches;
startoff = what[1];
exec_result = pcre_exec(ppcre, pe, text.c_str(), text.size(), startoff, 0, what, sizeof(what)/sizeof(int));
}
}
run = tim.elapsed();
result = (std::min)(run, result);
}
return result / iter;
}
}
#else
namespace pcr{
double time_match(const std::string& re, const std::string& text, bool icase)
{
return -1;
}
double time_find_all(const std::string& re, const std::string& text, bool icase)
{
return -1;
}
}
#endif
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