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/* regex.cpp
* Copyright (C) 2005 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "tnt/regex.h"
#include <stdexcept>
#include <locale>
namespace tnt
{
static inline bool isdigit(char ch)
{
return ch >= '0' && ch <= '9';
}
unsigned regex_smatch::size() const
{
unsigned n;
for (n = 0; n < 10 && matchbuf[n].rm_so >= 0; ++n)
;
return n;
}
std::string regex_smatch::get(unsigned n) const
{
return str.substr(matchbuf[n].rm_so, matchbuf[n].rm_eo - matchbuf[n].rm_so);
}
std::string regex_smatch::format(const std::string& s) const
{
enum state_type
{
state_0,
state_esc,
state_var0,
state_var1,
state_1
} state;
state = state_0;
std::string ret;
for (std::string::const_iterator it = s.begin(); it != s.end(); ++it)
{
char ch = *it;
switch (state)
{
case state_0:
if (ch == '$')
state = state_var0;
else if (ch == '\\')
{
ret = std::string(s.begin(), it);
state = state_esc;
}
break;
case state_esc:
ret += ch;
state = state_1;
break;
case state_var0:
if (isdigit(ch))
{
ret = std::string(s.begin(), it - 1);
regoff_t s = matchbuf[ch - '0'].rm_so;
regoff_t e = matchbuf[ch - '0'].rm_eo;
if (s >= 0 && e >= 0)
ret.append(str, s, e-s);
state = state_1;
}
else
state = state_0;
break;
case state_1:
if (ch == '$')
state = state_var1;
else if (state == '\\')
state = state_esc;
else
ret += ch;
break;
case state_var1:
if (isdigit(ch))
{
unsigned s = matchbuf[ch - '0'].rm_so;
unsigned e = matchbuf[ch - '0'].rm_eo;
if (s >= 0 && e >= 0)
ret.append(str, s, e-s);
state = state_1;
}
else if (ch == '$')
ret += '$';
else
{
ret += '$';
ret += ch;
}
break;
}
}
switch (state)
{
case state_0:
case state_var0:
return s;
case state_esc:
return ret + '\\';
case state_var1:
return ret + '$';
case state_1:
return ret;
}
return ret;
}
void regex::checkerr(int ret) const
{
if (ret != 0)
{
char errbuf[256];
regerror(ret, &expr, errbuf, sizeof(errbuf));
throw std::runtime_error(errbuf);
}
}
bool regex::match(const std::string& str_, int eflags) const
{
regex_smatch smatch;
return match(str_, smatch, eflags);
}
bool regex::match(const std::string& str_, regex_smatch& smatch, int eflags) const
{
smatch.str = str_;
int ret = regexec(&expr, str_.c_str(),
sizeof(smatch.matchbuf) / sizeof(regmatch_t), smatch.matchbuf, eflags);
if (ret ==REG_NOMATCH)
return false;
checkerr(ret);
return true;
}
void regex::free()
{
regfree(&expr);
}
}
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