TRE regex provider (the same engine used by Unreal 3.2)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@10399 e03df62e-2008-0410-955e-edbf42e46eb7

src/modules/extra/m_regex_posix.cpp

@@ -80,7 +80,7 @@ public:
 	{
 		Me->Modules->PublishInterface("RegularExpression", this);
 		Implementation eventlist[] = { I_OnRequest, I_OnRehash };
-		Me->Modules->Attach(eventlist, this, 1);
+		Me->Modules->Attach(eventlist, this, 2);
 		OnRehash(NULL, "");
 	}
 

src/modules/extra/m_regex_tre.cpp

@@ -0,0 +1,106 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include "inspircd.h"
+#include "m_regex.h"
+#include <sys/types.h>
+#include <tre/regex.h>
+
+/* $ModDesc: Regex Provider Module for TRE Regular Expressions */
+/* $CompileFlags: pkgconfincludes("tre","tre/regex.h","") */
+/* $LinkerFlags: pkgconflibs("tre","/libtre.so","-ltre") rpath("pkg-config --libs tre") */
+/* $ModDep: m_regex.h */
+
+class TRERegexException : public ModuleException
+{
+public:
+	TRERegexException(const std::string& rx, const std::string& error)
+		: ModuleException(std::string("Error in regex ") + rx + ": " + error)
+	{
+	}
+};
+
+class TRERegex : public Regex
+{
+private:
+	regex_t regbuf;
+
+public:
+	TRERegex(const std::string& rx, InspIRCd* Me) : Regex(rx, Me)
+	{
+		int flags = REG_EXTENDED | REG_NOSUB;
+		int errcode;
+		errcode = regcomp(&regbuf, rx.c_str(), flags);
+		if (errcode)
+		{
+			// Get the error string into a std::string. YUCK this involves at least 2 string copies.
+			std::string error;
+			char* errbuf;
+			size_t sz = regerror(errcode, &regbuf, NULL, 0);
+			errbuf = new char[sz + 1];
+			memset(errbuf, 0, sz + 1);
+			regerror(errcode, &regbuf, errbuf, sz + 1);
+			error = errbuf;
+			delete[] errbuf;
+			regfree(&regbuf);
+			throw TRERegexException(rx, error);
+		}
+	}
+
+	virtual ~TRERegex()
+	{
+		regfree(&regbuf);
+	}
+
+	virtual bool Matches(const std::string& text)
+	{
+		if (regexec(&regbuf, text.c_str(), 0, NULL, 0) == 0)
+		{
+			// Bang. :D
+			return true;
+		}
+		return false;
+	}
+};
+
+class ModuleRegexTRE : public Module
+{
+public:
+	ModuleRegexTRE(InspIRCd* Me) : Module(Me)
+	{
+		Me->Modules->PublishInterface("RegularExpression", this);
+		Implementation eventlist[] = { I_OnRequest };
+		Me->Modules->Attach(eventlist, this, 1);
+	}
+
+	virtual ~ModuleRegexTRE()
+	{
+		ServerInstance->Modules->UnpublishInterface("RegularExpression", this);
+	}
+
+	virtual const char* OnRequest(Request* request)
+	{
+		if (strcmp("REGEX-NAME", request->GetId()) == 0)
+		{
+			return "tre";
+		}
+		else if (strcmp("REGEX", request->GetId()) == 0)
+		{
+			RegexFactoryRequest* rfr = (RegexFactoryRequest*)request;
+			std::string rx = rfr->GetRegex();
+			rfr->result = new TRERegex(rx, ServerInstance);
+			return "OK";
+		}
+		return NULL;
+	}
+};