hl2sdk/public/tier1/utlstringtoken.h

//===== Copyright © 1996-2005, Valve Corporation, All rights reserved. ======//
//
// Purpose: 
//
// $NoKeywords: $
//
//===========================================================================//

#ifndef UTLSTRINGTOKEN_H
#define UTLSTRINGTOKEN_H

#ifdef _WIN32
#pragma once
#endif

#include <limits.h>
#include "tier1/generichash.h"

#define STRINGTOKEN_MURMURHASH_SEED 0x31415926

class CUtlString;
class IFormatOutputStream;
class CFormatStringElement;

// AMNOTE: See VStringTokenSystem001
// Interact with stringtokendatabase.txt
PLATFORM_INTERFACE bool g_bUpdateStringTokenDatabase;
PLATFORM_INTERFACE void RegisterStringToken( uint32 nHashCode, const char *pStart, const char *pEnd = NULL, bool bExtraAddToDatabase = true );

class CUtlStringToken
{
public:
	FORCEINLINE CUtlStringToken( uint32 nHashCode = 0 ) : m_nHashCode( nHashCode ) {}
	FORCEINLINE CUtlStringToken( const char *str ) : m_nHashCode( 0 ) 
	{
		if(str && *str)
		{
			m_nHashCode = MurmurHash2LowerCase( str, STRINGTOKEN_MURMURHASH_SEED );
			if(g_bUpdateStringTokenDatabase)
			{
				RegisterStringToken( m_nHashCode, str, 0, true );
			}
		}
	}

	FORCEINLINE bool operator==( CUtlStringToken const &other ) const { return ( other.m_nHashCode == m_nHashCode ); }
	FORCEINLINE bool operator!=( CUtlStringToken const &other ) const { return !operator==( other ); }
	FORCEINLINE bool operator<( CUtlStringToken const &other ) const { return ( m_nHashCode < other.m_nHashCode ); }

	FORCEINLINE bool IsValid() const { return m_nHashCode != 0; }
	FORCEINLINE uint32 GetHashCode() const { return m_nHashCode; }
	FORCEINLINE void SetHashCode( uint32 hash ) { m_nHashCode = hash; }

	DLL_CLASS_IMPORT void FormatTo( IFormatOutputStream* pOutputStream, CFormatStringElement pElement ) const;
	DLL_CLASS_IMPORT static bool TrackTokenCreation( const char *s1, const char *s2 );

private:
	uint32 m_nHashCode;
};

FORCEINLINE CUtlStringToken MakeStringToken( const char *str )
{
	return CUtlStringToken( str );
}

#endif // UTLSTRINGTOKEN_H