APreprocessor.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
// Code from several projects used here, such as boost and gtest.
 
//NOLINTBEGIN(modernize-*,cppcoreguidelines-macro-*)

#define AUI_PP_CAT(_1, _2) AUI_PP_INTERNAL_CAT(_1, _2)

#define AUI_PP_STRINGIZE(...) AUI_PP_INTERNAL_STRINGIZE(__VA_ARGS__)

#define AUI_PP_EMPTY(...)

#define AUI_PP_COMMA(...) ,

#define AUI_PP_IDENTITY(_1) _1

#define AUI_PP_NARG(...) \
 AUI_PP_INTERNAL_16TH(  \
     (__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0))

#define AUI_PP_HAS_COMMA(...) \
 AUI_PP_INTERNAL_16TH(       \
     (__VA_ARGS__, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0))

#define AUI_PP_HEAD(...) AUI_PP_INTERNAL_HEAD((__VA_ARGS__, unusedArg))

#define AUI_PP_TAIL(...) AUI_PP_INTERNAL_TAIL((__VA_ARGS__))

#define AUI_PP_VARIADIC_CALL(_Macro, ...) \
 AUI_PP_IDENTITY(                        \
     AUI_PP_CAT(_Macro, AUI_PP_NARG(__VA_ARGS__))(__VA_ARGS__))

#define AUI_PP_IS_EMPTY(...)                                               \
 AUI_PP_INTERNAL_IS_EMPTY(AUI_PP_HAS_COMMA(__VA_ARGS__),                \
                            AUI_PP_HAS_COMMA(AUI_PP_COMMA __VA_ARGS__), \
                            AUI_PP_HAS_COMMA(__VA_ARGS__()),              \
                            AUI_PP_HAS_COMMA(AUI_PP_COMMA __VA_ARGS__()))

#define AUI_PP_IF(_Cond, _Then, _Else) \
 AUI_PP_CAT(AUI_PP_INTERNAL_IF_, _Cond)(_Then, _Else)

#define AUI_PP_GENERIC_IF(_Cond, _Then, _Else) \
 AUI_PP_REMOVE_PARENS(AUI_PP_IF(_Cond, _Then, _Else))

#define AUI_PP_NARG0(...) \
 AUI_PP_IF(AUI_PP_IS_EMPTY(__VA_ARGS__), 0, AUI_PP_NARG(__VA_ARGS__))

#define AUI_PP_IS_BEGIN_PARENS(...)                              \
 AUI_PP_HEAD(AUI_PP_CAT(AUI_PP_INTERNAL_IBP_IS_VARIADIC_R_, \
                            AUI_PP_INTERNAL_IBP_IS_VARIADIC_C __VA_ARGS__))

#define AUI_PP_IS_ENCLOSED_PARENS(...)             \
 AUI_PP_IF(AUI_PP_IS_BEGIN_PARENS(__VA_ARGS__), \
             AUI_PP_IS_EMPTY(AUI_PP_EMPTY __VA_ARGS__), 0)

#define AUI_PP_REMOVE_PARENS(...) AUI_PP_INTERNAL_REMOVE_PARENS __VA_ARGS__

#define AUI_PP_FOR_EACH(_Macro, _Data, _Tuple)                        \
 AUI_PP_CAT(AUI_PP_INTERNAL_FOR_EACH_IMPL_, AUI_PP_NARG0 _Tuple) \
 (0, _Macro, _Data, _Tuple)

#define AUI_PP_REPEAT(_Macro, _Data, _N)           \
 AUI_PP_CAT(AUI_PP_INTERNAL_FOR_EACH_IMPL_, _N) \
 (0, _Macro, _Data, AUI_PP_INTENRAL_EMPTY_TUPLE)

#define AUI_PP_INC(_i) AUI_PP_CAT(AUI_PP_INTERNAL_INC_, _i)

#define AUI_PP_COMMA_IF(_i) AUI_PP_CAT(AUI_PP_INTERNAL_COMMA_IF_, _i)
 
/*
 * Internal details follow. Do not use any of these symbols outside of this file or we will break your code.
 */
#define AUI_PP_INTENRAL_EMPTY_TUPLE (, , , , , , , , , , , , , , , )
#define AUI_PP_INTERNAL_CAT(_1, _2) _1##_2
#define AUI_PP_INTERNAL_STRINGIZE(...) #__VA_ARGS__
#define AUI_PP_INTERNAL_CAT_5(_1, _2, _3, _4, _5) _1##_2##_3##_4##_5
#define AUI_PP_INTERNAL_IS_EMPTY(_1, _2, _3, _4)                             \
 AUI_PP_HAS_COMMA(AUI_PP_INTERNAL_CAT_5(AUI_PP_INTERNAL_IS_EMPTY_CASE_, \
                                            _1, _2, _3, _4))
#define AUI_PP_INTERNAL_IS_EMPTY_CASE_0001 ,
#define AUI_PP_INTERNAL_IF_1(_Then, _Else) _Then
#define AUI_PP_INTERNAL_IF_0(_Then, _Else) _Else
 
// Because of MSVC treating a token with a comma in it as a single token when
// passed to another macro, we need to force it to evaluate it as multiple
// tokens. We do that by using a "IDENTITY(MACRO PARENTHESIZED_ARGS)" macro. We
// define one per possible macro that relies on this behavior. Note "_Args" must
// be parenthesized.
#define AUI_PP_INTERNAL_INTERNAL_16TH(_1, _2, _3, _4, _5, _6, _7, _8, _9, \
                                       _10, _11, _12, _13, _14, _15, _16,  \
                                       ...)                                \
 _16
#define AUI_PP_INTERNAL_16TH(_Args) \
 AUI_PP_IDENTITY(AUI_PP_INTERNAL_INTERNAL_16TH _Args)
#define AUI_PP_INTERNAL_INTERNAL_HEAD(_1, ...) _1
#define AUI_PP_INTERNAL_HEAD(_Args) \
 AUI_PP_IDENTITY(AUI_PP_INTERNAL_INTERNAL_HEAD _Args)
#define AUI_PP_INTERNAL_INTERNAL_TAIL(_1, ...) __VA_ARGS__
#define AUI_PP_INTERNAL_TAIL(_Args) \
 AUI_PP_IDENTITY(AUI_PP_INTERNAL_INTERNAL_TAIL _Args)
 
#define AUI_PP_INTERNAL_IBP_IS_VARIADIC_C(...) 1 _
#define AUI_PP_INTERNAL_IBP_IS_VARIADIC_R_1 1,
#define AUI_PP_INTERNAL_IBP_IS_VARIADIC_R_AUI_PP_INTERNAL_IBP_IS_VARIADIC_C \
 0,
#define AUI_PP_INTERNAL_REMOVE_PARENS(...) __VA_ARGS__
#define AUI_PP_INTERNAL_INC_0 1
#define AUI_PP_INTERNAL_INC_1 2
#define AUI_PP_INTERNAL_INC_2 3
#define AUI_PP_INTERNAL_INC_3 4
#define AUI_PP_INTERNAL_INC_4 5
#define AUI_PP_INTERNAL_INC_5 6
#define AUI_PP_INTERNAL_INC_6 7
#define AUI_PP_INTERNAL_INC_7 8
#define AUI_PP_INTERNAL_INC_8 9
#define AUI_PP_INTERNAL_INC_9 10
#define AUI_PP_INTERNAL_INC_10 11
#define AUI_PP_INTERNAL_INC_11 12
#define AUI_PP_INTERNAL_INC_12 13
#define AUI_PP_INTERNAL_INC_13 14
#define AUI_PP_INTERNAL_INC_14 15
#define AUI_PP_INTERNAL_INC_15 16
#define AUI_PP_INTERNAL_COMMA_IF_0
#define AUI_PP_INTERNAL_COMMA_IF_1 ,
#define AUI_PP_INTERNAL_COMMA_IF_2 ,
#define AUI_PP_INTERNAL_COMMA_IF_3 ,
#define AUI_PP_INTERNAL_COMMA_IF_4 ,
#define AUI_PP_INTERNAL_COMMA_IF_5 ,
#define AUI_PP_INTERNAL_COMMA_IF_6 ,
#define AUI_PP_INTERNAL_COMMA_IF_7 ,
#define AUI_PP_INTERNAL_COMMA_IF_8 ,
#define AUI_PP_INTERNAL_COMMA_IF_9 ,
#define AUI_PP_INTERNAL_COMMA_IF_10 ,
#define AUI_PP_INTERNAL_COMMA_IF_11 ,
#define AUI_PP_INTERNAL_COMMA_IF_12 ,
#define AUI_PP_INTERNAL_COMMA_IF_13 ,
#define AUI_PP_INTERNAL_COMMA_IF_14 ,
#define AUI_PP_INTERNAL_COMMA_IF_15 ,
#define AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, _element) \
 _Macro(_i, _Data, _element)
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_0(_i, _Macro, _Data, _Tuple)
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_1(_i, _Macro, _Data, _Tuple) \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple)
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_2(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_1(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_3(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_2(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_4(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_3(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_5(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_4(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_6(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_5(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_7(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_6(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_8(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_7(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_9(_i, _Macro, _Data, _Tuple)    \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_8(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_10(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_9(AUI_PP_INC(_i), _Macro, _Data,    \
                                   (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_11(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_10(AUI_PP_INC(_i), _Macro, _Data,   \
                                    (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_12(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_11(AUI_PP_INC(_i), _Macro, _Data,   \
                                    (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_13(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_12(AUI_PP_INC(_i), _Macro, _Data,   \
                                    (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_14(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_13(AUI_PP_INC(_i), _Macro, _Data,   \
                                    (AUI_PP_TAIL _Tuple))
#define AUI_PP_INTERNAL_FOR_EACH_IMPL_15(_i, _Macro, _Data, _Tuple)   \
 AUI_PP_INTERNAL_CALL_MACRO(_Macro, _i, _Data, AUI_PP_HEAD _Tuple) \
 AUI_PP_INTERNAL_FOR_EACH_IMPL_14(AUI_PP_INC(_i), _Macro, _Data,   \
                                    (AUI_PP_TAIL _Tuple))
 
//NOLINTEND(modernize-*,cppcoreguidelines-macro-*)

© 2025 AUI Framework Contributors. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. All trademarks are property of their respective owners.