106 lines
2.6 KiB
C++
106 lines
2.6 KiB
C++
/*
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*
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* Copyright (c) 2002
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* John Maddock
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*
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* Use, modification and distribution are subject to the
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* Boost Software License, Version 1.0. (See accompanying file
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* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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*/
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#include "./regex_comparison.hpp"
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#include <boost/timer.hpp>
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#include <boost/regex.hpp>
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namespace b{
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double time_match(const std::string& re, const std::string& text)
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{
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boost::regex e(re, boost::regex_constants::ECMAScript | boost::regex_constants::optimize);
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boost::smatch what;
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boost::timer tim;
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int iter = 1;
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int counter, repeats;
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double result = 0;
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double run;
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do
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{
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tim.restart();
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for(counter = 0; counter < iter; ++counter)
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{
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boost::regex_match(text, what, e);
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}
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result = tim.elapsed();
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iter *= 2;
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}while(result < 0.5);
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iter /= 2;
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// repeat test and report least value for consistency:
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for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)
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{
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tim.restart();
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for(counter = 0; counter < iter; ++counter)
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{
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boost::regex_match(text, what, e);
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}
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run = tim.elapsed();
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result = (std::min)(run, result);
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}
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return result / iter;
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}
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//bool dummy_grep_proc(const boost::smatch&)
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//{ return true; }
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struct noop
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{
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void operator()( boost::smatch const & ) const
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{
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}
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};
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double time_find_all(const std::string& re, const std::string& text)
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{
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boost::regex e(re, boost::regex_constants::ECMAScript | boost::regex_constants::optimize);
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boost::smatch what;
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boost::timer tim;
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int iter = 1;
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int counter, repeats;
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double result = 0;
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double run;
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do
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{
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tim.restart();
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for(counter = 0; counter < iter; ++counter)
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{
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boost::sregex_iterator begin( text.begin(), text.end(), e ), end;
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std::for_each( begin, end, noop() );
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//boost::regex_grep(&dummy_grep_proc, text, e);
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}
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result = tim.elapsed();
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iter *= 2;
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}while(result < 0.5);
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iter /= 2;
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if(result >10)
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return result / iter;
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// repeat test and report least value for consistency:
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for(repeats = 0; repeats < REPEAT_COUNT; ++repeats)
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{
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tim.restart();
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for(counter = 0; counter < iter; ++counter)
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{
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boost::sregex_iterator begin( text.begin(), text.end(), e ), end;
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std::for_each( begin, end, noop() );
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//boost::regex_grep(&dummy_grep_proc, text, e);
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}
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run = tim.elapsed();
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result = (std::min)(run, result);
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}
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return result / iter;
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}
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}
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