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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013-2014, 2016, 2019-2022, 2024 Sadie Powell <sadie@witchery.services>
*
* 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/>.
*/
/// $CompilerFlags: find_compiler_flags("re2")
/// $LinkerFlags: find_linker_flags("re2")
/// $PackageInfo: require_system("alpine") pkgconf re2-dev
/// $PackageInfo: require_system("arch") pkgconf re2
/// $PackageInfo: require_system("darwin") pkg-config re2
/// $PackageInfo: require_system("debian~") libre2-dev pkg-config
#include "inspircd.h"
#include "modules/regex.h"
#include <re2/re2.h>
class RE2Pattern final
: public Regex::Pattern
{
private:
RE2 regex;
static RE2::Options BuildOptions(uint8_t options)
{
RE2::Options re2options;
re2options.set_case_sensitive(!(options & Regex::OPT_CASE_INSENSITIVE));
re2options.set_log_errors(false);
return re2options;
}
public:
RE2Pattern(const Module* mod, const std::string& pattern, uint8_t options)
: Regex::Pattern(pattern, options)
, regex(pattern, BuildOptions(options))
{
if (!regex.ok())
throw Regex::Exception(mod, pattern, regex.error());
}
bool IsMatch(const std::string& text) override
{
return RE2::FullMatch(text, regex);
}
std::optional<Regex::MatchCollection> Matches(const std::string& text) override
{
std::vector<re2::StringPiece> re2captures(regex.NumberOfCapturingGroups() + 1);
bool result = regex.Match(text, 0, text.length(), RE2::ANCHOR_BOTH, re2captures.data(), static_cast<int>(re2captures.size()));
if (!result)
return std::nullopt;
Regex::Captures captures;
Regex::NamedCaptures namedcaptures;
for (size_t idx = 0; idx < re2captures.size(); ++idx)
{
captures.emplace_back(re2captures[idx]);
auto iter = regex.CapturingGroupNames().find(static_cast<int>(idx));
if (iter != regex.CapturingGroupNames().end())
namedcaptures.emplace(iter->second, re2captures[idx]);
}
return Regex::MatchCollection(captures, namedcaptures);
}
};
class ModuleRegexRE2 final
: public Module
{
private:
Regex::SimpleEngine<RE2Pattern> regex;
public:
ModuleRegexRE2()
: Module(VF_VENDOR, "Provides the re2 regular expression engine which uses the RE2 library.")
, regex(this, "re2")
{
}
};
MODULE_INIT(ModuleRegexRE2)
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