Jason Felds
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
#ifndef LUA_REFERENCE_H
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#define LUA_REFERENCE_H
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#include "RageUtil_AutoPtr.h"
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#include "LuaManager.h"
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struct lua_State;
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typedef lua_State Lua;
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/** @brief A self-cleaning Lua reference. */
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class LuaReference
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{
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public:
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LuaReference();
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virtual ~LuaReference();
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/* Copying a reference makes a new reference pointing to the same object. */
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LuaReference( const LuaReference &cpy );
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LuaReference &operator=( const LuaReference &cpy );
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/* Create a reference pointing to the item at the top of the stack, and pop
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* the stack. */
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void SetFromStack( Lua *L );
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void SetFromNil();
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/* Evaluate an expression that returns an object; store the object in a reference.
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* For example, evaluating "{ 1, 2, 3 }" will result in a reference to a table.
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* On success, return true. On error, set to nil and return false. */
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bool SetFromExpression( const RString &sExpression );
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/** @brief Deep-copy tables, detaching this reference from any others. */
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void DeepCopy();
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/* Push the referenced object onto the stack. If not set (or set to nil), push nil. */
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virtual void PushSelf( Lua *L ) const;
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/**
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* @brief Determine if the reference is set.
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*
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* SetFromNil() counts as being set.
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* @return true if it's set. */
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bool IsSet() const;
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/**
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* @brief Determine if the reference is nil.
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* @return true if it's nil. */
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bool IsNil() const;
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void Unset() { Unregister(); }
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/* Return the referenced type, or LUA_TNONE if not set. */
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int GetLuaType() const;
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RString Serialize() const;
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template<typename T>
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static LuaReference Create( const T &val )
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{
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Lua *L = LUA->Get();
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LuaReference ref;
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LuaHelpers::Push( L, val );
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ref.SetFromStack( L );
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LUA->Release( L );
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return ref;
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}
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template<class T>
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static LuaReference CreateFromPush( T &obj )
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{
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Lua *L = LUA->Get();
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LuaReference ref;
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obj.PushSelf( L );
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ref.SetFromStack( L );
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LUA->Release( L );
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return ref;
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}
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private:
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void Unregister();
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int m_iReference;
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};
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typedef AutoPtrCopyOnWrite<LuaReference> apActorCommands;
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class LuaTable: public LuaReference
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{
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public:
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LuaTable();
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/* Get the key with the given name, and push it on the stack. */
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void Get( Lua *L, const RString &sKey );
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/* Set a key by the given name to a value on the stack, and pop the value
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* off the stack. */
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void Set( Lua *L, const RString &sKey );
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};
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#endif
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/**
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* @file
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* @author Glenn Maynard, Chris Danford (c) 2005
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* @section LICENSE
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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