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/*
*
* Copyright (c) 2004
* 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 "regex_comparison.hpp"
#ifdef BOOST_HAS_XPRESSIVE
#include <cassert>
#include <iostream>
#include <boost/timer.hpp>
#include <boost/xpressive/xpressive.hpp>
namespace dxpr
{
double time_match(const std::string& re, const std::string& text, bool icase)
{
try{
boost::xpressive::regex_constants::syntax_option_type flags = boost::xpressive::regex_constants::optimize;
if(icase)
flags = flags | boost::xpressive::regex_constants::icase;
boost::xpressive::sregex e(boost::xpressive::sregex::compile(re, flags));
boost::xpressive::smatch what;
boost::timer tim;
int iter = 1;
int counter, repeats;
double result = 0;
double run;
assert(boost::xpressive::regex_match( text, what, e ));
do
{
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
boost::xpressive::regex_match( text, what, e );
}
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)
{
boost::xpressive::regex_match( text, what, e );
}
run = tim.elapsed();
result = (std::min)(run, result);
}
return result / iter;
}
catch(const std::exception& e)
{
std::cout << "Exception: " << e.what() << std::endl;
return -1;
}
}
struct noop
{
void operator()( boost::xpressive::smatch const & ) const
{
}
};
double time_find_all(const std::string& re, const std::string& text, bool icase)
{
try{
boost::xpressive::regex_constants::syntax_option_type flags = boost::xpressive::regex_constants::optimize;
if(icase)
flags = flags | boost::xpressive::regex_constants::icase;
boost::xpressive::sregex e(boost::xpressive::sregex::compile(re, flags));
boost::xpressive::smatch what;
boost::timer tim;
int iter = 1;
int counter, repeats;
double result = 0;
double run;
do
{
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
boost::xpressive::sregex_iterator begin( text.begin(), text.end(), e ), end;
std::for_each( begin, end, noop() );
}
result = tim.elapsed();
iter *= 2;
}while(result < 0.5);
iter /= 2;
if(result >10)
return result / iter;
// repeat test and report least value for consistency:
for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)
{
tim.restart();
for(counter = 0; counter < iter; ++counter)
{
boost::xpressive::sregex_iterator begin( text.begin(), text.end(), e ), end;
std::for_each( begin, end, noop() );
}
run = tim.elapsed();
result = (std::min)(run, result);
}
return result / iter;
}
catch(const std::exception& e)
{
std::cout << "Exception: " << e.what() << std::endl;
return -1;
}
}
}
#else
namespace dxpr{
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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