From f2386ea01f36fd0bf2054dafb656c0826ad51e45 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Sun, 26 Sep 2021 18:49:05 +0100
Subject: Add the regex_pcre2 module.

---
 src/modules/extra/m_regex_pcre2.cpp | 92 +++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/modules/extra/m_regex_pcre2.cpp

(limited to 'src/modules')

diff --git a/src/modules/extra/m_regex_pcre2.cpp b/src/modules/extra/m_regex_pcre2.cpp
new file mode 100644
index 000000000..a8e9c535a
--- /dev/null
+++ b/src/modules/extra/m_regex_pcre2.cpp
@@ -0,0 +1,92 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2021 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("libpcre2-8")
+/// $LinkerFlags: find_linker_flags("libpcre2-8")
+
+/// $PackageInfo: require_system("arch") pcre2
+/// $PackageInfo: require_system("centos") pcre2-devel
+/// $PackageInfo: require_system("darwin") pcre2
+/// $PackageInfo: require_system("debian") libpcre2-dev
+/// $PackageInfo: require_system("ubuntu") libpcre2-dev
+
+
+#include "inspircd.h"
+#include "modules/regex.h"
+
+#define PCRE2_CODE_UNIT_WIDTH 8
+#include <pcre2.h>
+
+#ifdef _WIN32
+# pragma comment(lib, "pcre2-8.lib")
+#endif
+
+class PCRE2Pattern final
+	: public Regex::Pattern
+{
+ private:
+	pcre2_code* regex;
+
+ public:
+	PCRE2Pattern(const std::string& pattern, uint8_t options)
+		: Regex::Pattern(pattern, options)
+	{
+		int flags = 0;
+		if (options & Regex::OPT_CASE_INSENSITIVE)
+			flags &= PCRE2_CASELESS;
+
+		int errorcode;
+		PCRE2_SIZE erroroffset;
+		regex = pcre2_compile(reinterpret_cast<PCRE2_SPTR8>(pattern.c_str()), pattern.length(), flags, &errorcode, &erroroffset, nullptr);
+		if (!regex)
+		{
+			PCRE2_UCHAR errorstr[128];
+			pcre2_get_error_message(errorcode, errorstr, sizeof errorstr);
+			throw Regex::Exception(pattern, reinterpret_cast<const char*>(errorstr), erroroffset);
+		}
+	}
+
+	~PCRE2Pattern() override
+	{
+		pcre2_code_free(regex);
+	}
+
+	bool IsMatch(const std::string& text) override
+	{
+		pcre2_match_data* unused = pcre2_match_data_create(1, nullptr);
+		int result = pcre2_match(regex, reinterpret_cast<PCRE2_SPTR8>(text.c_str()), text.length(), 0, 0, unused, nullptr);
+		pcre2_match_data_free(unused);
+		return result >= 0;
+	}
+};
+
+class ModuleRegexPCRE2 final
+	: public Module
+{
+ private:
+	Regex::SimpleEngine<PCRE2Pattern> regex;
+
+ public:
+	ModuleRegexPCRE2()
+		: Module(VF_VENDOR, "Provides the pcre2 regular expression engine which uses the PCRE2 library.")
+		, regex(this, "pcre2")
+	{
+	}
+};
+
+MODULE_INIT(ModuleRegexPCRE2)
-- 
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