From 889d521e05f2e922683d48c74eb00290e7a2f548 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Wed, 17 Jul 2024 00:06:50 +0100
Subject: Shuffle the modules about a bit.

---
 modules/regex_stdlib.cpp | 119 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 modules/regex_stdlib.cpp

(limited to 'modules/regex_stdlib.cpp')

diff --git a/modules/regex_stdlib.cpp b/modules/regex_stdlib.cpp
new file mode 100644
index 000000000..336e15a06
--- /dev/null
+++ b/modules/regex_stdlib.cpp
@@ -0,0 +1,119 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2013, 2016, 2019-2023 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(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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