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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2013, 2016, 2018, 2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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 "inspircd.h"
#include "modules/regex.h"
#include <regex>
class StdLibPattern final
: public Regex::Pattern
{
private:
std::regex regex;
public:
StdLibPattern(const Module* mod, const std::string& pattern, uint8_t options, std::regex::flag_type type)
: Regex::Pattern(pattern, options)
{
// Convert the generic pattern options to stdlib pattern flags.
std::regex_constants::syntax_option_type flags = type | std::regex::optimize;
if (options & Regex::OPT_CASE_INSENSITIVE)
flags |= std::regex::icase;
try
{
regex.assign(pattern, flags);
}
catch(const std::regex_error& error)
{
throw Regex::Exception(mod, pattern, error.what());
}
}
bool IsMatch(const std::string& text) override
{
return std::regex_search(text, regex);
}
std::optional<Regex::MatchCollection> Matches(const std::string& text) override
{
std::smatch matches;
if (!std::regex_search(text, matches, regex))
return std::nullopt;
Regex::Captures captures(matches.size());
for (const auto& match : matches)
captures.push_back(match);
// The stdregex engine does not support named captures.
static const Regex::NamedCaptures unusednc;
return Regex::MatchCollection(std::move(captures), unusednc);
}
};
class StdLibEngine final
: public Regex::Engine
{
public:
std::regex::flag_type regextype;
StdLibEngine(Module* Creator)
: Regex::Engine(Creator, "stdregex")
{
}
Regex::PatternPtr Create(const std::string& pattern, uint8_t options) const override
{
return std::make_shared<StdLibPattern>(creator, pattern, options, regextype);
}
};
class ModuleRegexStdLib final
: public Module
{
private:
StdLibEngine regex;
public:
ModuleRegexStdLib()
: Module(VF_VENDOR, "Provides the stdregex regular expression engine which uses the C++11 std::regex regular expression matching system.")
, regex(this)
{
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("stdregex");
regex.regextype = tag->getEnum("type", std::regex::ECMAScript,
{
{ "awk", std::regex::awk },
{ "bre", std::regex::basic },
{ "ecmascript", std::regex::ECMAScript },
{ "egrep", std::regex::egrep },
{ "ere", std::regex::extended },
{ "grep", std::regex::grep },
});
}
};
MODULE_INIT(ModuleRegexStdLib)
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