cuberite-2a/src/Bindings/PluginLua.h

// PluginLua.h

// Declares the cPluginLua class representing a plugin written in Lua





#pragma once

#include "Plugin.h"
#include "WebPlugin.h"
#include "LuaState.h"

// Names for the global variables through which the plugin is identified in its LuaState
#define LUA_PLUGIN_NAME_VAR_NAME     "_MCServerInternal_PluginName"
#define LUA_PLUGIN_INSTANCE_VAR_NAME "_MCServerInternal_PluginInstance"




// fwd: UI/Window.h
class cWindow;





// tolua_begin
class cPluginLua :
	public cPlugin,
	public cWebPlugin
{
public:
	// tolua_end
	
	/** A RAII-style mutex lock for accessing the internal LuaState.
	This will be the only way to retrieve the plugin's LuaState;
	therefore it directly supports accessing the LuaState of the locked plugin.
	Usage:
		cPluginLua::cOperation Op(SomePlugin);
		Op().Call(...)  // Call a function in the plugin's LuaState
	*/
	class cOperation
	{
	public:
		cOperation(cPluginLua & a_Plugin) :
			m_Plugin(a_Plugin),
			m_Lock(a_Plugin.m_CriticalSection)
		{
		}

		cLuaState & operator ()(void) { return m_Plugin.m_LuaState; }
		
	protected:
		cPluginLua & m_Plugin;
		
		/** RAII lock for m_Plugin.m_CriticalSection */
		cCSLock m_Lock;
	} ;
	
	
	cPluginLua(const AString & a_PluginDirectory);
	~cPluginLua();

	virtual void OnDisable(void) override;
	virtual bool Initialize(void) override;

	virtual void Tick(float a_Dt) override;

	virtual bool OnBlockSpread              (cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ, eSpreadSource a_Source) override;
	virtual bool OnBlockToPickups           (cWorld * a_World, cEntity * a_Digger, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, cItems & a_Pickups) override;
	virtual bool OnChat                     (cPlayer * a_Player, AString & a_Message) override;
	virtual bool OnChunkAvailable           (cWorld * a_World, int a_ChunkX, int a_ChunkZ) override;
	virtual bool OnChunkGenerated           (cWorld * a_World, int a_ChunkX, int a_ChunkZ, cChunkDesc * a_ChunkDesc) override;
	virtual bool OnChunkGenerating          (cWorld * a_World, int a_ChunkX, int a_ChunkZ, cChunkDesc * a_ChunkDesc) override;
	virtual bool OnChunkUnloaded            (cWorld * a_World, int a_ChunkX, int a_ChunkZ) override;
	virtual bool OnChunkUnloading           (cWorld * a_World, int a_ChunkX, int a_ChunkZ) override;
	virtual bool OnCollectingPickup         (cPlayer * a_Player, cPickup * a_Pickup) override;
	virtual bool OnCraftingNoRecipe         (const cPlayer * a_Player, const cCraftingGrid * a_Grid, cCraftingRecipe * a_Recipe) override;
	virtual bool OnDisconnect               (cClientHandle & a_Client, const AString & a_Reason) override;
	virtual bool OnExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split) override;
	virtual bool OnExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
	virtual bool OnExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
	virtual bool OnHandshake                (cClientHandle * a_Client, const AString & a_Username) override;
	virtual bool OnHopperPullingItem        (cWorld & a_World, cHopperEntity & a_Hopper, int a_DstSlotNum, cBlockEntityWithItems & a_SrcEntity, int a_SrcSlotNum) override;
	virtual bool OnHopperPushingItem        (cWorld & a_World, cHopperEntity & a_Hopper, int a_SrcSlotNum, cBlockEntityWithItems & a_DstEntity, int a_DstSlotNum) override;
	virtual bool OnKilling                  (cEntity & a_Victim, cEntity * a_Killer) override;
	virtual bool OnLogin                    (cClientHandle * a_Client, int a_ProtocolVersion, const AString & a_Username) override;
	virtual bool OnPlayerAnimation          (cPlayer & a_Player, int a_Animation) override;
	virtual bool OnPlayerBreakingBlock      (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerBrokenBlock        (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerDestroyed          (cPlayer & a_Player) override;
	virtual bool OnPlayerEating             (cPlayer & a_Player) override;
	virtual bool OnPlayerFished             (cPlayer & a_Player, const cItems & a_Reward) override;
	virtual bool OnPlayerFishing            (cPlayer & a_Player, cItems & a_Reward) override;
	virtual bool OnPlayerJoined             (cPlayer & a_Player) override;
	virtual bool OnPlayerMoved              (cPlayer & a_Player) override;
	virtual bool OnPlayerLeftClick          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, char a_Status) override;
	virtual bool OnPlayerPlacedBlock        (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerPlacingBlock       (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerRightClick         (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
	virtual bool OnPlayerRightClickingEntity(cPlayer & a_Player, cEntity & a_Entity) override;
	virtual bool OnPlayerShooting           (cPlayer & a_Player) override;
	virtual bool OnPlayerSpawned            (cPlayer & a_Player) override;
	virtual bool OnPlayerTossingItem        (cPlayer & a_Player) override;
	virtual bool OnPlayerUsedBlock          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerUsedItem           (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
	virtual bool OnPlayerUsingBlock         (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) override;
	virtual bool OnPlayerUsingItem          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override;
	virtual bool OnPluginMessage            (cClientHandle & a_Client, const AString & a_Channel, const AString & a_Message) override;
	virtual bool OnPluginsLoaded            (void) override;
	virtual bool OnPostCrafting             (const cPlayer * a_Player, const cCraftingGrid * a_Grid, cCraftingRecipe * a_Recipe) override;
	virtual bool OnPreCrafting              (const cPlayer * a_Player, const cCraftingGrid * a_Grid, cCraftingRecipe * a_Recipe) override;
	virtual bool OnProjectileHitBlock       (cProjectileEntity & a_Projectile) override;
	virtual bool OnProjectileHitEntity      (cProjectileEntity & a_Projectile, cEntity & a_HitEntity) override;
	virtual bool OnSpawnedEntity            (cWorld & a_World, cEntity & a_Entity) override;
	virtual bool OnSpawnedMonster           (cWorld & a_World, cMonster & a_Monster) override;
	virtual bool OnSpawningEntity           (cWorld & a_World, cEntity & a_Entity) override;
	virtual bool OnSpawningMonster          (cWorld & a_World, cMonster & a_Monster) override;
	virtual bool OnTakeDamage               (cEntity & a_Receiver, TakeDamageInfo & a_TakeDamageInfo) override;
	virtual bool OnUpdatedSign              (cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4, cPlayer * a_Player) override;
	virtual bool OnUpdatingSign             (cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ,       AString & a_Line1,       AString & a_Line2,       AString & a_Line3,       AString & a_Line4, cPlayer * a_Player) override;
	virtual bool OnWeatherChanged           (cWorld & a_World) override;
	virtual bool OnWeatherChanging          (cWorld & a_World, eWeather & a_NewWeather) override;
	virtual bool OnWorldStarted             (cWorld & a_World) override;
	virtual bool OnWorldTick                (cWorld & a_World, float a_Dt, int a_LastTickDurationMSec) override;
	
	virtual bool HandleCommand(const AStringVector & a_Split, cPlayer * a_Player) override;
	
	virtual bool HandleConsoleCommand(const AStringVector & a_Split, cCommandOutputCallback & a_Output) override;

	virtual void ClearCommands(void) override;
	
	virtual void ClearConsoleCommands(void) override;

	/** Returns true if the plugin contains the function for the specified hook type, using the old-style registration (#121) */
	bool CanAddOldStyleHook(int a_HookType);
	
	// cWebPlugin override
	virtual const AString GetWebTitle(void) const {return GetName(); }

	// cWebPlugin and WebAdmin stuff
	virtual AString HandleWebRequest(const HTTPRequest * a_Request ) override;
	bool AddWebTab(const AString & a_Title, lua_State * a_LuaState, int a_FunctionReference);	// >> EXPORTED IN MANUALBINDINGS <<
	
	/** Binds the command to call the function specified by a Lua function reference. Simply adds to CommandMap. */
	void BindCommand(const AString & a_Command, int a_FnRef);

	/** Binds the console command to call the function specified by a Lua function reference. Simply adds to CommandMap. */
	void BindConsoleCommand(const AString & a_Command, int a_FnRef);

	cLuaState & GetLuaState(void) { return m_LuaState; }

	cCriticalSection & GetCriticalSection(void) { return m_CriticalSection; }
	
	/** Removes a previously referenced object (luaL_unref()) */
	void Unreference(int a_LuaRef);
	
	/** Calls the plugin-specified "cLuaWindow closing" callback. Returns true only if the callback returned true */
	bool CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPlayer & a_Player, bool a_CanRefuse);
	
	/** Calls the plugin-specified "cLuaWindow slot changed" callback. */
	void CallbackWindowSlotChanged(int a_FnRef, cWindow & a_Window, int a_SlotNum);
	
	/** Returns the name of Lua function that should handle the specified hook type in the older (#121) API */
	static const char * GetHookFnName(int a_HookType);
	
	/** Adds a Lua function to be called for the specified hook.
	The function has to be on the Lua stack at the specified index a_FnRefIdx
	Returns true if the hook was added successfully.
	*/
	bool AddHookRef(int a_HookType, int a_FnRefIdx);
	
	/** Calls a function in this plugin's LuaState with parameters copied over from a_ForeignState.
	The values that the function returns are placed onto a_ForeignState.
	Returns the number of values returned, if successful, or negative number on failure. */
	int CallFunctionFromForeignState(
		const AString & a_FunctionName,
		cLuaState & a_ForeignState,
		int a_ParamStart,
		int a_ParamEnd
	);
	
	// The following templates allow calls to arbitrary Lua functions residing in the plugin:
	
	/** Call a Lua function with 0 args */
	template <typename FnT> bool Call(FnT a_Fn)
	{
		cCSLock Lock(m_CriticalSection);
		return m_LuaState.Call(a_Fn);
	}

	/** Call a Lua function with 1 arg */
	template <typename FnT, typename ArgT0> bool Call(FnT a_Fn, ArgT0 a_Arg0)
	{
		cCSLock Lock(m_CriticalSection);
		return m_LuaState.Call(a_Fn, a_Arg0);
	}

	/** Call a Lua function with 2 args */
	template <typename FnT, typename ArgT0, typename ArgT1> bool Call(FnT a_Fn, ArgT0 a_Arg0, ArgT1 a_Arg1)
	{
		cCSLock Lock(m_CriticalSection);
		return m_LuaState.Call(a_Fn, a_Arg0, a_Arg1);
	}

	/** Call a Lua function with 3 args */
	template <typename FnT, typename ArgT0, typename ArgT1, typename ArgT2> bool Call(FnT a_Fn, ArgT0 a_Arg0, ArgT1 a_Arg1, ArgT2 a_Arg2)
	{
		cCSLock Lock(m_CriticalSection);
		return m_LuaState.Call(a_Fn, a_Arg0, a_Arg1, a_Arg2);
	}

	/** Call a Lua function with 4 args */
	template <typename FnT, typename ArgT0, typename ArgT1, typename ArgT2, typename ArgT3> bool Call(FnT a_Fn, ArgT0 a_Arg0, ArgT1 a_Arg1, ArgT2 a_Arg2, ArgT3 a_Arg3)
	{
		cCSLock Lock(m_CriticalSection);
		return m_LuaState.Call(a_Fn, a_Arg0, a_Arg1, a_Arg2, a_Arg3);
	}

protected:
	/** Maps command name into Lua function reference */
	typedef std::map<AString, int> CommandMap;
	
	/** Provides an array of Lua function references */
	typedef std::vector<cLuaState::cRef *> cLuaRefs;
	
	/** Maps hook types into arrays of Lua function references to call for each hook type */
	typedef std::map<int, cLuaRefs> cHookMap;
	
	cCriticalSection m_CriticalSection;
	cLuaState m_LuaState;
	
	CommandMap m_Commands;
	CommandMap m_ConsoleCommands;
	
	cHookMap m_HookMap;
	
	/** Releases all Lua references and closes the LuaState */
	void Close(void);
} ;  // tolua_export