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/*************************************************************************************************
* Regular expression
* Copyright (C) 2009-2012 FAL Labs
* This file is part of Kyoto Cabinet.
* 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
* 3 of the License, or any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* 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, see <http://www.gnu.org/licenses/>.
*************************************************************************************************/
#include "kcregex.h"
#include "myconf.h"
#if _KC_PXREGEX
extern "C" {
#include <regex.h>
}
#else
#include <regex>
#endif
namespace kyotocabinet { // common namespace
/**
* Regex internal.
*/
struct RegexCore {
#if _KC_PXREGEX
::regex_t rbuf;
bool alive;
bool nosub;
#else
std::regex* rbuf;
#endif
};
/**
* Default constructor.
*/
Regex::Regex() : opq_(NULL) {
#if _KC_PXREGEX
_assert_(true);
RegexCore* core = new RegexCore;
core->alive = false;
core->nosub = false;
opq_ = (void*)core;
#else
_assert_(true);
RegexCore* core = new RegexCore;
core->rbuf = NULL;
opq_ = (void*)core;
#endif
}
/**
* Destructor.
*/
Regex::~Regex() {
#if _KC_PXREGEX
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (core->alive) ::regfree(&core->rbuf);
delete core;
#else
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
delete core->rbuf;
delete core;
#endif
}
/**
* Compile a string of regular expression.
*/
bool Regex::compile(const std::string& regex, uint32_t opts) {
#if _KC_PXREGEX
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (core->alive) {
::regfree(&core->rbuf);
core->alive = false;
}
int32_t cflags = REG_EXTENDED;
if (opts & IGNCASE) cflags |= REG_ICASE;
if ((opts & MATCHONLY) || regex.empty()) {
cflags |= REG_NOSUB;
core->nosub = true;
}
if (::regcomp(&core->rbuf, regex.c_str(), cflags) != 0) return false;
core->alive = true;
return true;
#else
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (core->rbuf) {
delete core->rbuf;
core->rbuf = NULL;
}
int32_t cflags = std::regex::ECMAScript;
if (opts & IGNCASE) cflags |= std::regex::icase;
if ((opts & MATCHONLY) || regex.empty()) cflags |= std::regex::nosubs;
try {
core->rbuf = new std::regex(regex, (std::regex::flag_type)cflags);
} catch (...) {
core->rbuf = NULL;
return false;
}
return true;
#endif
}
/**
* Check whether a string matches the regular expression.
*/
bool Regex::match(const std::string& str) {
#if _KC_PXREGEX
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (!core->alive) return false;
if (core->nosub) return ::regexec(&core->rbuf, str.c_str(), 0, NULL, 0) == 0;
::regmatch_t subs[1];
return ::regexec(&core->rbuf, str.c_str(), 1, subs, 0) == 0;
#else
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (!core->rbuf) return false;
std::smatch res;
return std::regex_search(str, res, *core->rbuf);
#endif
}
/**
* Check whether a string matches the regular expression.
*/
std::string Regex::replace(const std::string& str, const std::string& alt) {
#if _KC_PXREGEX
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (!core->alive || core->nosub) return str;
regmatch_t subs[256];
if (::regexec(&core->rbuf, str.c_str(), sizeof(subs) / sizeof(*subs), subs, 0) != 0)
return str;
const char* sp = str.c_str();
std::string xstr;
bool first = true;
while (sp[0] != '\0' && ::regexec(&core->rbuf, sp, 10, subs, first ? 0 : REG_NOTBOL) == 0) {
first = false;
if (subs[0].rm_so == -1) break;
xstr.append(sp, subs[0].rm_so);
for (const char* rp = alt.c_str(); *rp != '\0'; rp++) {
if (*rp == '$') {
if (rp[1] >= '0' && rp[1] <= '9') {
int32_t num = rp[1] - '0';
if (subs[num].rm_so != -1 && subs[num].rm_eo != -1)
xstr.append(sp + subs[num].rm_so, subs[num].rm_eo - subs[num].rm_so);
++rp;
} else if (rp[1] == '&') {
xstr.append(sp + subs[0].rm_so, subs[0].rm_eo - subs[0].rm_so);
++rp;
} else if (rp[1] != '\0') {
xstr.append(++rp, 1);
}
} else {
xstr.append(rp, 1);
}
}
sp += subs[0].rm_eo;
if (subs[0].rm_eo < 1) break;
}
xstr.append(sp);
return xstr;
#else
_assert_(true);
RegexCore* core = (RegexCore*)opq_;
if (!core->rbuf) return str;
return std::regex_replace(str, *core->rbuf, alt);
#endif
}
} // common namespace
// END OF FILE
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