libs/regex/example/timer/regex_timer.cpp
/*
*
* Copyright (c) 1998-2002
* 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)
*
*/
#ifdef _MSC_VER
#pragma warning(disable: 4996 4127)
#endif
#include <boost/config.hpp>
#include <boost/regex.hpp>
#include <boost/cregex.hpp>
#include <boost/timer.hpp>
#include <boost/smart_ptr.hpp>
#include <string>
#include <algorithm>
#include <deque>
#include <iterator>
#ifdef BOOST_RE_OLD_IOSTREAM
#include <iostream.h>
#include <fstream.h>
#else
#include <iostream>
#include <fstream>
using std::cout;
using std::cin;
using std::cerr;
using std::istream;
using std::ostream;
using std::endl;
using std::ifstream;
using std::streambuf;
using std::getline;
#endif
#if defined(_WIN32) && defined(BOOST_REGEX_USE_WIN32_LOCALE)
#include <windows.h>
#endif
#if (defined(_MSC_VER) && (_MSC_VER <= 1300)) || defined(__sgi)
// maybe no Koenig lookup, use using declaration instead:
using namespace boost;
#endif
#ifndef BOOST_NO_WREGEX
ostream& operator << (ostream& os, const std::wstring& s)
{
std::wstring::const_iterator i, j;
i = s.begin();
j = s.end();
while(i != j)
{
os.put(static_cast<char>(*i));
++i;
}
return os;
}
#endif
template <class S>
class string_out_iterator
{
public:
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
private:
S* out;
public:
string_out_iterator(S& s) : out(&s) {}
string_out_iterator& operator++() { return *this; }
string_out_iterator& operator++(int) { return *this; }
string_out_iterator& operator*() { return *this; }
string_out_iterator& operator=(typename S::value_type v)
{
out->append(1, v);
return *this;
}
};
namespace boost{
#if defined(BOOST_MSVC) || (defined(__BORLANDC__) && (__BORLANDC__ == 0x550)) || defined(__SGI_STL_PORT)
//
// problem with std::getline under MSVC6sp3
// and C++ Builder 5.5, is this really that hard?
istream& getline(istream& is, std::string& s)
{
s.erase();
char c = static_cast<char>(is.get());
while(c != '\n')
{
BOOST_ASSERT(is.good());
s.append(1, c);
c = static_cast<char>(is.get());
}
return is;
}
#else
istream& getline(istream& is, std::string& s)
{
std::getline(is, s);
if(s.size() && (s[s.size() -1] == '\r'))
s.erase(s.size() - 1);
return is;
}
#endif
}
int main(int argc, char**argv)
{
ifstream ifs;
std::istream* p_in = &std::cin;
if(argc == 2)
{
ifs.open(argv[1]);
ifs.peek();
if(!ifs.good())
{
cout << "Bad filename: " << argv[1] << endl;
return -1;
}
p_in = &ifs;
}
boost::regex ex;
boost::match_results<std::string::const_iterator> sm;
#ifndef BOOST_NO_WREGEX
std::wstring ws1, ws2;
boost::wregex wex;
boost::match_results<std::wstring::const_iterator> wsm;
#endif
boost::match_results<std::deque<char>::iterator> dm;
std::string s1, s2, ts;
std::deque<char> ds;
boost::regex_tA r;
boost::scoped_array<boost::regmatch_t> matches;
std::size_t nsubs;
boost::timer t;
double tim;
int result = 0;
unsigned iters = 100;
double wait_time = (std::min)(t.elapsed_min() * 1000, 0.5);
while(true)
{
cout << "Enter expression (or \"quit\" to exit): ";
boost::getline(*p_in, s1);
if(argc == 2)
cout << endl << s1 << endl;
if(s1 == "quit")
break;
#ifndef BOOST_NO_WREGEX
ws1.erase();
std::copy(s1.begin(), s1.end(), string_out_iterator<std::wstring>(ws1));
#endif
try{
ex.assign(s1);
#ifndef BOOST_NO_WREGEX
wex.assign(ws1);
#endif
}
catch(std::exception& e)
{
cout << "Error in expression: \"" << e.what() << "\"" << endl;
continue;
}
int code = regcompA(&r, s1.c_str(), boost::REG_PERL);
if(code != 0)
{
char buf[256];
regerrorA(code, &r, buf, 256);
cout << "regcompA error: \"" << buf << "\"" << endl;
continue;
}
nsubs = r.re_nsub + 1;
matches.reset(new boost::regmatch_t[nsubs]);
while(true)
{
cout << "Enter string to search (or \"quit\" to exit): ";
boost::getline(*p_in, s2);
if(argc == 2)
cout << endl << s2 << endl;
if(s2 == "quit")
break;
#ifndef BOOST_NO_WREGEX
ws2.erase();
std::copy(s2.begin(), s2.end(), string_out_iterator<std::wstring>(ws2));
#endif
ds.erase(ds.begin(), ds.end());
std::copy(s2.begin(), s2.end(), std::back_inserter(ds));
unsigned i;
iters = 10;
tim = 1.1;
#if defined(_WIN32) && defined(BOOST_REGEX_USE_WIN32_LOCALE)
MSG msg;
PeekMessage(&msg, 0, 0, 0, 0);
Sleep(0);
#endif
// cache load:
regex_search(s2, sm, ex);
// measure time interval for basic_regex<char>
do{
iters *= static_cast<unsigned>((tim > 0.001) ? (1.1/tim) : 100);
t.restart();
for(i =0; i < iters; ++i)
{
result = regex_search(s2, sm, ex);
}
tim = t.elapsed();
}while(tim < wait_time);
cout << "regex time: " << (tim * 1000000 / iters) << "us" << endl;
if(result)
{
for(i = 0; i < sm.size(); ++i)
{
ts = sm[i];
cout << "\tmatch " << i << ": \"";
cout << ts;
cout << "\" (matched=" << sm[i].matched << ")" << endl;
}
cout << "\tmatch $`: \"";
cout << std::string(sm[-1]);
cout << "\" (matched=" << sm[-1].matched << ")" << endl;
cout << "\tmatch $': \"";
cout << std::string(sm[-2]);
cout << "\" (matched=" << sm[-2].matched << ")" << endl << endl;
}
#ifndef BOOST_NO_WREGEX
// measure time interval for boost::wregex
iters = 10;
tim = 1.1;
// cache load:
regex_search(ws2, wsm, wex);
do{
iters *= static_cast<unsigned>((tim > 0.001) ? (1.1/tim) : 100);
t.restart();
for(i = 0; i < iters; ++i)
{
result = regex_search(ws2, wsm, wex);
}
tim = t.elapsed();
}while(tim < wait_time);
cout << "wregex time: " << (tim * 1000000 / iters) << "us" << endl;
if(result)
{
std::wstring tw;
for(i = 0; i < wsm.size(); ++i)
{
tw.erase();
std::copy(wsm[i].first, wsm[i].second, string_out_iterator<std::wstring>(tw));
cout << "\tmatch " << i << ": \"" << tw;
cout << "\" (matched=" << sm[i].matched << ")" << endl;
}
cout << "\tmatch $`: \"";
tw.erase();
std::copy(wsm[-1].first, wsm[-1].second, string_out_iterator<std::wstring>(tw));
cout << tw;
cout << "\" (matched=" << sm[-1].matched << ")" << endl;
cout << "\tmatch $': \"";
tw.erase();
std::copy(wsm[-2].first, wsm[-2].second, string_out_iterator<std::wstring>(tw));
cout << tw;
cout << "\" (matched=" << sm[-2].matched << ")" << endl << endl;
}
#endif
// measure time interval for basic_regex<char> using a deque
iters = 10;
tim = 1.1;
// cache load:
regex_search(ds.begin(), ds.end(), dm, ex);
do{
iters *= static_cast<unsigned>((tim > 0.001) ? (1.1/tim) : 100);
t.restart();
for(i = 0; i < iters; ++i)
{
result = regex_search(ds.begin(), ds.end(), dm, ex);
}
tim = t.elapsed();
}while(tim < wait_time);
cout << "regex time (search over std::deque<char>): " << (tim * 1000000 / iters) << "us" << endl;
if(result)
{
for(i = 0; i < dm.size(); ++i)
{
ts.erase();
std::copy(dm[i].first, dm[i].second, string_out_iterator<std::string>(ts));
cout << "\tmatch " << i << ": \"" << ts;
cout << "\" (matched=" << sm[i].matched << ")" << endl;
}
cout << "\tmatch $`: \"";
ts.erase();
std::copy(dm[-1].first, dm[-1].second, string_out_iterator<std::string>(ts));
cout << ts;
cout << "\" (matched=" << sm[-1].matched << ")" << endl;
cout << "\tmatch $': \"";
ts.erase();
std::copy(dm[-2].first, dm[-2].second, string_out_iterator<std::string>(ts));
cout << ts;
cout << "\" (matched=" << sm[-2].matched << ")" << endl << endl;
}
// measure time interval for POSIX matcher:
iters = 10;
tim = 1.1;
// cache load:
regexecA(&r, s2.c_str(), nsubs, matches.get(), 0);
do{
iters *= static_cast<unsigned>((tim > 0.001) ? (1.1/tim) : 100);
t.restart();
for(i = 0; i < iters; ++i)
{
result = regexecA(&r, s2.c_str(), nsubs, matches.get(), 0);
}
tim = t.elapsed();
}while(tim < wait_time);
cout << "POSIX regexecA time: " << (tim * 1000000 / iters) << "us" << endl;
if(result == 0)
{
for(i = 0; i < nsubs; ++i)
{
if(matches[i].rm_so >= 0)
{
ts.assign(s2.begin() + matches[i].rm_so, s2.begin() + matches[i].rm_eo);
cout << "\tmatch " << i << ": \"" << ts << "\" (matched=" << (matches[i].rm_so != -1) << ")"<< endl;
}
else
cout << "\tmatch " << i << ": \"\" (matched=" << (matches[i].rm_so != -1) << ")" << endl; // no match
}
cout << "\tmatch $`: \"";
ts.erase();
ts.assign(s2.begin(), s2.begin() + matches[0].rm_so);
cout << ts;
cout << "\" (matched=" << (matches[0].rm_so != 0) << ")" << endl;
cout << "\tmatch $': \"";
ts.erase();
ts.assign(s2.begin() + matches[0].rm_eo, s2.end());
cout << ts;
cout << "\" (matched=" << (matches[0].rm_eo != (int)s2.size()) << ")" << endl << endl;
}
}
regfreeA(&r);
}
return 0;
}
#if defined(_WIN32) && defined(BOOST_REGEX_USE_WIN32_LOCALE) && !defined(UNDER_CE)
#pragma comment(lib, "user32.lib")
#endif