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

/****************************************************************************
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __CC_LUA_VALUE_H_
#define __CC_LUA_VALUE_H_

#include <string>
#include <map>
#include <list>

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

#include "base/ccTypes.h"
#include "base/CCRef.h"

#if CC_TARGET_PLATFORM == CC_PLATFORM_BLACKBERRY
using std::memcpy;
using std::memset;
#endif

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

NS_CC_BEGIN

typedef int LUA_FUNCTION;
typedef int LUA_TABLE;
typedef int LUA_STRING;

class LuaValue;

typedef std::map<std::string, LuaValue> LuaValueDict;
typedef LuaValueDict::const_iterator LuaValueDictIterator;
typedef std::list<LuaValue> LuaValueArray;
typedef LuaValueArray::const_iterator LuaValueArrayIterator;

/// @cond
typedef enum
{
    LuaValueTypeInt,
    LuaValueTypeFloat,
    LuaValueTypeBoolean,
    LuaValueTypeString,
    LuaValueTypeDict,
    LuaValueTypeArray,
    LuaValueTypeObject
} LuaValueType;
/// @endcond

/// @cond
typedef union
{
    int intValue;
    float floatValue;
    bool booleanValue;
    std::string* stringValue;
    LuaValueDict* dictValue;
    LuaValueArray* arrayValue;
    Ref* ccobjectValue;
} LuaValueField;
/// @endcond

/**
 * Wrap different general types of data into a same specific type named LuaValue.
 * The general types supported as follows:int,float,bool,std::string,const char*,LuaValueDict,LuaValueArray,Ref.
 *
 * @lua NA
 * @js NA
 */
class LuaValue
{
public:
    /**
     * Construct a LuaValue object by a int value.
     *
     * @param intValue a int value.
     * @return a LuaValue object.
     */
    static const LuaValue intValue(const int intValue);

    /**
     * Construct a LuaValue object by a float value.
     *
     * @param floatValue a float value.
     * @return a LuaValue object.
     */
    static const LuaValue floatValue(const float floatValue);

    /**
     * Construct a LuaValue object by a boolean value.
     *
     * @param booleanValue a bool value.
     * @return a LuaValue object.
     */
    static const LuaValue booleanValue(const bool booleanValue);

    /**
     * Construct a LuaValue object by a string pointer.
     *
     * @param stringValue a string pointer.
     * @return a LuaValue object.
     */
    static const LuaValue stringValue(const char* stringValue);

    /**
     * Construct a LuaValue object by a std::string object.
     *
     * @param stringValue a std::string object.
     * @return a LuaValue object.
     */
    static const LuaValue stringValue(std::string_view stringValue);

    /**
     * Construct a LuaValue object by a LuaValueDict value.
     *
     * @param dictValue a LuaValueDict object.
     * @return a LuaValue object.
     */
    static const LuaValue dictValue(const LuaValueDict& dictValue);

    /**
     * Construct a LuaValue object by a LuaValueArray value.
     *
     * @param arrayValue a LuaValueArray object.
     * @return a LuaValue object.
     */
    static const LuaValue arrayValue(const LuaValueArray& arrayValue);

    /**
     * Construct a LuaValue object by a Ref object.
     *
     * @param ccobjectValue a Ref object.
     * @param objectTypename a string pointer point to the typename of object.
     * @return a LuaValue object.
     */
    static const LuaValue ccobjectValue(Ref* ccobjectValue, const char* objectTypename);

    /**
     * Construct a LuaValue object by a Ref object.
     *
     * @param ccobjectValue a Ref object.
     * @param objectTypename a std::string object represent the typename of object.
     * @return a LuaValue object.
     */
    static const LuaValue ccobjectValue(Ref* ccobjectValue, std::string_view objectTypename);

    /**
     * Default constructor of LuaValue.
     * Set the default value for _type(LuaValueTypeInt) and _ccobjectType(nullptr),and init the _field.
     */
    LuaValue() : _type(LuaValueTypeInt), _ccobjectType(nullptr) { memset(&_field, 0, sizeof(_field)); }

    /**
     * Copy constructor of Data.
     */
    LuaValue(const LuaValue& rhs);

    /**
     * Override of operator= .
     */
    LuaValue& operator=(const LuaValue& rhs);

    /**
     * Destructor.
     */
    ~LuaValue();

    /**
     * Get the type of LuaValue object.
     *
     * @return the type of LuaValue object.
     */
    LuaValueType getType() const { return _type; }

    /**
     * Get the typename of the Ref object.
     *
     * @return the reference of _ccobjectType.
     */
    std::string_view getObjectTypename() const { return *_ccobjectType; }

    /**
     * Get the int value of LuaValue object.
     *
     * @return the int value.
     */
    int intValue() const { return _field.intValue; }

    /**
     * Get the float value of LuaValue object.
     *
     * @return the float value.
     */
    float floatValue() const { return _field.floatValue; }

    /**
     * Get the boolean value of LuaValue object.
     *
     * @return the boolean value.
     */
    bool booleanValue() const { return _field.booleanValue; }

    /**
     * Get the boolean value of LuaValue object.
     *
     * @return the reference about string value.
     */
    std::string_view stringValue() const { return *_field.stringValue; }

    /**
     * Get the LuaValueDict value of LuaValue object.
     *
     * @return the LuaValueDict value.
     */
    const LuaValueDict& dictValue() const { return *_field.dictValue; }

    /**
     * Get the LuaValueArray value of LuaValue object.
     *
     * @return the LuaValueArray value.
     */
    const LuaValueArray& arrayValue() const { return *_field.arrayValue; }

    /**
     * Get the Ref object of LuaValue object.
     *
     * @return the pointer point to a Ref object.
     */
    Ref* ccobjectValue() const { return _field.ccobjectValue; }

private:
    LuaValueField _field;
    LuaValueType _type;
    std::string* _ccobjectType;

    void copy(const LuaValue& rhs);
};

inline std::string adxelua_tostr(lua_State* L, int arg)
{
    size_t l      = 0;
    const char* s = lua_tolstring(L, arg, &l);
    return std::string{s, l};
}

inline std::string_view adxelua_tosv(lua_State* L, int arg)
{
    size_t l      = 0;
    const char* s = lua_tolstring(L, arg, &l);
    return std::string_view{s, l};
}

NS_CC_END

// end group
/// @}
#endif  // __CC_LUA_VALUE_H_