axmol/extensions/scripting/lua-bindings/manual/CCLuaStack.h

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 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __CC_LUA_STACK_H_
#define __CC_LUA_STACK_H_

extern "C" {
#include "lua.h"
}

#include "scripting/lua-bindings/manual/CCLuaValue.h"

/**
 * @addtogroup lua
 * @{
 */

NS_CC_BEGIN

/**
 * LuaStack is used to manager the operation on the lua_State,eg., push data onto the lua_State, execute the function
 * depended on the lua_State. In the current mechanism, there is only one lua_State in one LuaStack object.
 *
 * @lua NA
 * @js NA
 */
class LuaStack : public Ref
{
public:
    /**
     * Create a LuaStack object, it will new a lua_State.
     */
    static LuaStack* create();
    /**
     * Create a LuaStack object with the existed lua_State.
     */
    static LuaStack* attach(lua_State* L);

    /** Destructor. */
    virtual ~LuaStack();

    /**
     * Method used to get a pointer to the lua_State that the script module is attached to.
     *
     * @return A pointer to the lua_State that the script module is attached to.
     */
    lua_State* getLuaState() { return _state; }

    /**
     * Add a path to find lua files in.
     *
     * @param path to be added to the Lua search path.
     */
    virtual void addSearchPath(const char* path);

    /**
     * Add lua loader.
     *
     * @param func a function pointer point to the loader function.
     */
    virtual void addLuaLoader(lua_CFunction func);

    /**
     * Reload script code corresponding to moduleFileName.
     * If value of package["loaded"][moduleFileName] is existed, it would set the value nil.Then,it calls executeString
     * function.
     *
     * @param moduleFileName String object holding the filename of the script file that is to be executed.
     * @return 0 if the string is executed correctly or other if the string is executed wrongly.
     */
    virtual int reload(const char* moduleFileName);

    /**
     * Remove the related reference about the Ref object stored in the Lua table by set the value of corresponding key
     * nil: The related Lua tables are toluafix_refid_ptr_mapping,toluafix_refid_type_mapping,tolua_value_root and
     * object_Metatable["tolua_ubox"] or tolua_ubox. Meanwhile set the corresponding userdata nullptr and remove the all
     * the lua function reference corresponding to this object.
     *
     * In current mechanism, this function is called in the destructor of Ref object, developer don't call this
     * functions.
     *
     * @param object the key object to remove script object.
     */
    virtual void removeScriptObjectByObject(Ref* object);

    /**
     * Remove Lua function reference by nHandler by setting toluafix_refid_function_mapping[nHandle] nil.
     *
     * @param nHandler the function reference index to find the corresponding Lua function pointer.
     */
    virtual void removeScriptHandler(int nHandler);

    /**
     * Reallocate Lua function reference index to the Lua function pointer to add reference.
     *
     * @param nHandler the function reference index to find the corresponding Lua function pointer.
     */
    virtual int reallocateScriptHandler(int nHandler);

    /**
     * Execute script code contained in the given string.
     *
     * @param codes holding the valid script code that should be executed.
     * @return 0 if the string is executed correctly, other if the string is executed wrongly.
     */
    virtual int executeString(const char* codes);

    /**
     * Execute a script file.
     *
     * @param filename String object holding the filename of the script file that is to be executed.
     * @return the return values by calling executeFunction.
     */
    virtual int executeScriptFile(const char* filename);

    /**
     * Execute a scripted global function.
     * The function should not take any parameters and should return an integer.
     *
     * @param functionName String object holding the name of the function, in the global script environment, that is to
     * be executed.
     * @return The integer value returned from the script function.
     */
    virtual int executeGlobalFunction(const char* functionName);

    /**
     * Set the stack top index 0.
     */
    virtual void clean();

    /**
     * Pushes a integer number with value intValue onto the stack.
     *
     * @param intValue a integer number.
     */
    virtual void pushInt(int intValue);

    /**
     * Pushes a float number with value floatValue onto the stack.
     *
     * @param floatValue a float number.
     */
    virtual void pushFloat(float floatValue);

    /**
     * Pushes a long number with value longValue onto the stack.
     *
     * @param longValue a long number.
     */
    virtual void pushLong(long longValue);

    /**
     * Pushes a bool value with boolValue onto the stack.
     *
     * @param boolValue a bool value.
     */
    virtual void pushBoolean(bool boolValue);

    /**
     * Pushes the zero-terminated string pointed to by stringValue onto the stack.
     *
     * @param stringValue a pointer point to a zero-terminated string stringValue.
     */
    virtual void pushString(std::string_view stringValue);

    /**
     * Pushes the string pointed to by stringValue with size length onto the stack.
     *
     * @param stringValue a pointer point to the string stringValue.
     * @param length the size.
     */
    virtual void pushString(const char* stringValue, int length);

    /**
     * Pushes a nil value onto the stack.
     */
    virtual void pushNil();

    /**
     * Pushes a Ref object onto the stack.
     *
     * @see toluafix_pushusertype_ccobject.
     */
    virtual void pushObject(Ref* objectValue, const char* typeName);

    /**
     * According to the type of LuaValue, it would called the other push function in the internal.
     *   type                           function
     * LuaValueTypeInt                   pushInt
     * LuaValueTypeFloat                 pushFloat
     * LuaValueTypeBoolean               pushBoolean
     * LuaValueTypeString                pushString
     * LuaValueTypeDict                  pushLuaValueDict
     * LuaValueTypeArray                 pushLuaValueArray
     * LuaValueTypeObject                pushObject
     *
     * @param value a LuaValue object.
     */
    virtual void pushLuaValue(const LuaValue& value);

    /**
     * Pushes a lua table onto the stack.
     * The key of table is the key of LuaValueDict which is std::map.
     * The value of table is according to the type of LuaValue of LuaValueDict by calling pushLuaValue,@see
     * pushLuaValue.
     *
     * @param dict a LuaValueDict object.
     */
    virtual void pushLuaValueDict(const LuaValueDict& dict);

    /**
     * Pushes a lua array table onto the stack.
     * The index of array table is begin at 1.
     * The value of array table is according to the type of LuaValue of LuaValueDict by calling pushLuaValue,@see
     * pushLuaValue.
     */
    virtual void pushLuaValueArray(const LuaValueArray& array);

    /**
     * Get the lua function pointer from toluafix_refid_function_mapping table by giving nHanlder.
     * If the lua function pointer corresponding to the nHanlder isn't found, it would push nil on the top index of
     * stack, then it would output the error log in the debug model.
     *
     * @return true if get the no-null function pointer otherwise false.
     */
    virtual bool pushFunctionByHandler(int nHandler);

    /**
     * Execute the lua function on the -(numArgs + 1) index on the stack by the numArgs variables passed.
     *
     * @param numArgs the number of variables.
     * @return 0 if it happen the error or it hasn't return value, otherwise it return the value by calling the lua
     * function.
     */
    virtual int executeFunction(int numArgs);

    /**
     * Execute the lua function corresponding to the nHandler by the numArgs variables passed.
     *
     * @param nHandler the index count corresponding to the lua function.
     * @param numArgs the number of variables.
     * @return the return value is the same as executeFunction,please @see executeFunction.
     */
    virtual int executeFunctionByHandler(int nHandler, int numArgs);

    /**
     * Execute the lua function corresponding to the handler by the numArgs variables passed.
     * By calling this function, the number of return value is numResults(may be > 1).
     * All the return values are used in the callback func.
     *
     * @param handler the index count corresponding to the lua function.
     * @param numArgs the number of variables.
     * @param numResults the number of return value.
     * @param func callback function which is called if the numResults > 0.
     * @return 0 if it happen error or it hasn't return value, otherwise return 1.
     */
    virtual int executeFunction(int handler,
                                int numArgs,
                                int numResults,
                                const std::function<void(lua_State*, int)>& func);

    /**
     * Handle the assert message.
     *
     * @return return true if current _callFromLua of LuaStack is not equal to 0 otherwise return false.
     */
    virtual bool handleAssert(const char* msg);

    /**
     * Loads a buffer as a Lua chunk.This function uses lua_load to load the Lua chunk in the buffer pointed to by chunk
     * with size chunkSize. If it supports xxtea encryption algorithm, the chunk and the chunkSize would be processed by
     * calling xxtea_decrypt to the real buffer and buffer size.
     *
     * @param L the current lua_State.
     * @param chunk the buffer pointer.
     * @param chunkSize the size of buffer.
     * @param chunkName the name of chunk pointer.
     * @return 0, LUA_ERRSYNTAX or LUA_ERRMEM:.
     */
    int luaLoadBuffer(lua_State* L, const char* chunk, int chunkSize, const char* chunkName);

    /**
     * Load the Lua chunks from the zip file
     *
     * @param zipFilePath file path to zip file.
     * @return 1 if load successfully otherwise 0.
     */
    int loadChunksFromZIP(const char* zipFilePath);

    /**
     * Load the Lua chunks from current lua_State.
     *
     * @param L the current lua_State.
     * @return 1 if load successfully otherwise 0.
     */
    int luaLoadChunksFromZIP(lua_State* L);

protected:
    LuaStack() : _state(nullptr), _callFromLua(0) {}

    bool init();
    bool initWithLuaState(lua_State* L);

    lua_State* _state;
    int _callFromLua;
};

NS_CC_END

// end group
/// @}
#endif  // __CC_LUA_STACK_H_