From 62e4c68907d8d33709c2c1f92a161dff00b3d5f2 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 15 Apr 2024 22:01:36 +0200
Subject: Adding upstream version 0.11.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/third-party/scnlib/include/scn/detail/args.h | 619 +++++++++++++++++++++++
 1 file changed, 619 insertions(+)
 create mode 100644 src/third-party/scnlib/include/scn/detail/args.h

(limited to 'src/third-party/scnlib/include/scn/detail/args.h')

diff --git a/src/third-party/scnlib/include/scn/detail/args.h b/src/third-party/scnlib/include/scn/detail/args.h
new file mode 100644
index 0000000..dd67852
--- /dev/null
+++ b/src/third-party/scnlib/include/scn/detail/args.h
@@ -0,0 +1,619 @@
+// Copyright 2017 Elias Kosunen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This file is a part of scnlib:
+//     https://github.com/eliaskosunen/scnlib
+
+#ifndef SCN_DETAIL_ARGS_H
+#define SCN_DETAIL_ARGS_H
+
+#include "../reader/common.h"
+#include "../util/array.h"
+
+SCN_GCC_PUSH
+SCN_GCC_IGNORE("-Wnoexcept")
+#include <string>
+SCN_GCC_POP
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    /**
+     * Allows reading an rvalue.
+     * Stores an rvalue and returns an lvalue reference to it via `operator()`.
+     * Create one with \ref temp.
+     */
+    template <typename T>
+    struct temporary {
+        temporary(T&& val) : value(SCN_MOVE(val)) {}
+
+        T& operator()() && noexcept
+        {
+            return value;
+        }
+
+        T value;
+    };
+    /**
+     * Factory function for \ref temporary.
+     *
+     * Canonical use case is with \ref scn::span:
+     * \code{.cpp}
+     * std::vector<char> buffer(32, '\0');
+     * auto result = scn::scan("123", "{}", scn::temp(scn::make_span(buffer)));
+     * // buffer == "123"
+     * \endcode
+     */
+    template <typename T,
+              typename std::enable_if<
+                  !std::is_lvalue_reference<T>::value>::type* = nullptr>
+    temporary<T> temp(T&& val)
+    {
+        return {SCN_FWD(val)};
+    }
+
+    namespace detail {
+        enum type {
+            none_type = 0,
+            // signed integer
+            schar_type,
+            short_type,
+            int_type,
+            long_type,
+            long_long_type,
+            // unsigned integer
+            uchar_type,
+            ushort_type,
+            uint_type,
+            ulong_type,
+            ulong_long_type,
+            // other integral types
+            bool_type,
+            char_type,
+            code_point_type,
+            last_integer_type = code_point_type,
+            // floats
+            float_type,
+            double_type,
+            long_double_type,
+            last_numeric_type = long_double_type,
+            // other
+            buffer_type,
+            string_type,
+            string_view_type,
+
+            custom_type,
+            last_type = custom_type
+        };
+
+        constexpr bool is_integral(type t) noexcept
+        {
+            return t > none_type && t <= last_integer_type;
+        }
+        constexpr bool is_arithmetic(type t) noexcept
+        {
+            return t > none_type && t <= last_numeric_type;
+        }
+
+        struct custom_value {
+            // using scan_type = error (*)(void*, Context&, ParseCtx&);
+
+            void* value;
+            void (*scan)();
+        };
+
+        template <typename Context, typename ParseCtx, typename T>
+        error scan_custom_arg(void* arg, Context& ctx, ParseCtx& pctx) noexcept
+        {
+            return visitor_boilerplate<scanner<T>>(*static_cast<T*>(arg), ctx,
+                                                   pctx);
+        }
+
+        struct monostate {
+        };
+
+        template <typename Ctx>
+        struct ctx_tag {
+        };
+        template <typename ParseCtx>
+        struct parse_ctx_tag {
+        };
+
+        class value {
+        public:
+            constexpr value() noexcept : m_empty{} {}
+
+            template <typename T>
+            explicit SCN_CONSTEXPR14 value(T& val) noexcept
+                : m_value(std::addressof(val))
+            {
+            }
+
+            template <typename Ctx, typename ParseCtx, typename T>
+            value(ctx_tag<Ctx>, parse_ctx_tag<ParseCtx>, T& val) noexcept
+                : m_custom(
+                      custom_value{std::addressof(val),
+                                   reinterpret_cast<void (*)()>(
+                                       &scan_custom_arg<Ctx, ParseCtx, T>)})
+            {
+            }
+
+            template <typename T>
+            SCN_CONSTEXPR14 T& get_as() noexcept
+            {
+                return *static_cast<T*>(m_value);
+            }
+            template <typename T>
+            constexpr const T& get_as() const noexcept
+            {
+                return *static_cast<const T*>(m_value);
+            }
+
+            SCN_CONSTEXPR14 custom_value& get_custom() noexcept
+            {
+                return m_custom;
+            }
+            SCN_NODISCARD constexpr const custom_value& get_custom()
+                const noexcept
+            {
+                return m_custom;
+            }
+
+        private:
+            union {
+                monostate m_empty;
+                void* m_value;
+                custom_value m_custom;
+            };
+        };
+
+        template <typename CharT, typename T, type Type>
+        struct init {
+            T* val;
+            static const type type_tag = Type;
+
+            constexpr init(T& v) : val(std::addressof(v)) {}
+            template <typename Ctx, typename ParseCtx>
+            SCN_CONSTEXPR14 value get()
+            {
+                SCN_EXPECT(val != nullptr);
+                return value{*val};
+            }
+        };
+        template <typename CharT, typename T>
+        struct init<CharT, T, custom_type> {
+            T* val;
+            static const type type_tag = custom_type;
+
+            constexpr init(T& v) : val(std::addressof(v)) {}
+            template <typename Ctx, typename ParseCtx>
+            SCN_CONSTEXPR14 value get()
+            {
+                SCN_EXPECT(val != nullptr);
+                return {ctx_tag<Ctx>{}, parse_ctx_tag<ParseCtx>{}, *val};
+            }
+        };
+
+        template <typename Context,
+                  typename ParseCtx,
+                  typename T,
+                  typename CharT = typename Context::char_type>
+        SCN_CONSTEXPR14 basic_arg<CharT> make_arg(T& value) noexcept;
+
+#define SCN_MAKE_VALUE(Tag, Type)                                         \
+    template <typename CharT>                                             \
+    constexpr init<CharT, Type, Tag> make_value(Type& val,                \
+                                                priority_tag<1>) noexcept \
+    {                                                                     \
+        return val;                                                       \
+    }
+
+        SCN_MAKE_VALUE(schar_type, signed char)
+        SCN_MAKE_VALUE(short_type, short)
+        SCN_MAKE_VALUE(int_type, int)
+        SCN_MAKE_VALUE(long_type, long)
+        SCN_MAKE_VALUE(long_long_type, long long)
+
+        SCN_MAKE_VALUE(uchar_type, unsigned char)
+        SCN_MAKE_VALUE(ushort_type, unsigned short)
+        SCN_MAKE_VALUE(uint_type, unsigned)
+        SCN_MAKE_VALUE(ulong_type, unsigned long)
+        SCN_MAKE_VALUE(ulong_long_type, unsigned long long)
+
+        SCN_MAKE_VALUE(bool_type, bool)
+        SCN_MAKE_VALUE(code_point_type, code_point)
+
+        SCN_MAKE_VALUE(float_type, float)
+        SCN_MAKE_VALUE(double_type, double)
+        SCN_MAKE_VALUE(long_double_type, long double)
+
+        SCN_MAKE_VALUE(buffer_type, span<CharT>)
+        SCN_MAKE_VALUE(string_type, std::basic_string<CharT>)
+        SCN_MAKE_VALUE(string_view_type, basic_string_view<CharT>)
+
+        template <typename CharT>
+        constexpr init<CharT, CharT, char_type> make_value(
+            CharT& val,
+            priority_tag<1>) noexcept
+        {
+            return val;
+        }
+
+        template <typename CharT, typename T>
+        constexpr inline auto make_value(T& val, priority_tag<0>) noexcept
+            -> init<CharT, T, custom_type>
+        {
+            return val;
+        }
+
+        enum : size_t {
+            packed_arg_bitsize = 5,
+            packed_arg_mask = (1 << packed_arg_bitsize) - 1,
+            max_packed_args = (sizeof(size_t) * 8 - 1) / packed_arg_bitsize,
+            is_unpacked_bit = size_t{1} << (sizeof(size_t) * 8ull - 1ull)
+        };
+    }  // namespace detail
+
+    SCN_CLANG_PUSH
+    SCN_CLANG_IGNORE("-Wpadded")
+
+    /// Type-erased scanning argument.
+    template <typename CharT>
+    class SCN_TRIVIAL_ABI basic_arg {
+    public:
+        using char_type = CharT;
+
+        class handle {
+        public:
+            explicit handle(detail::custom_value custom) : m_custom(custom) {}
+
+            template <typename Context, typename ParseCtx>
+            error scan(Context& ctx, ParseCtx& pctx)
+            {
+                return reinterpret_cast<error (*)(void*, Context&, ParseCtx&)>(
+                    m_custom.scan)(m_custom.value, ctx, pctx);
+            }
+
+        private:
+            detail::custom_value m_custom;
+        };
+
+        constexpr basic_arg() = default;
+
+        constexpr explicit operator bool() const noexcept
+        {
+            return m_type != detail::none_type;
+        }
+
+        SCN_NODISCARD constexpr detail::type type() const noexcept
+        {
+            return type;
+        }
+        SCN_NODISCARD constexpr bool is_integral() const noexcept
+        {
+            return detail::is_integral(m_type);
+        }
+        SCN_NODISCARD constexpr bool is_arithmetic() const noexcept
+        {
+            return detail::is_arithmetic(m_type);
+        }
+
+    private:
+        constexpr basic_arg(detail::value v, detail::type t) noexcept
+            : m_value(v), m_type(t)
+        {
+        }
+
+        template <typename Ctx, typename ParseCtx, typename T, typename C>
+        friend SCN_CONSTEXPR14 basic_arg<C> detail::make_arg(T& value) noexcept;
+
+        template <typename C, typename Visitor>
+        friend SCN_CONSTEXPR14 error visit_arg(Visitor&& vis,
+                                               basic_arg<C>& arg);
+
+        friend class basic_args<CharT>;
+
+        detail::value m_value;
+        detail::type m_type{detail::none_type};
+    };
+
+    SCN_CLANG_POP
+
+    template <typename CharT, typename Visitor>
+    SCN_CONSTEXPR14 error visit_arg(Visitor&& vis, basic_arg<CharT>& arg)
+    {
+        switch (arg.m_type) {
+            case detail::none_type:
+                break;
+
+            case detail::schar_type:
+                return vis(arg.m_value.template get_as<signed char>());
+            case detail::short_type:
+                return vis(arg.m_value.template get_as<short>());
+            case detail::int_type:
+                return vis(arg.m_value.template get_as<int>());
+            case detail::long_type:
+                return vis(arg.m_value.template get_as<long>());
+            case detail::long_long_type:
+                return vis(arg.m_value.template get_as<long long>());
+
+            case detail::uchar_type:
+                return vis(arg.m_value.template get_as<unsigned char>());
+            case detail::ushort_type:
+                return vis(arg.m_value.template get_as<unsigned short>());
+            case detail::uint_type:
+                return vis(arg.m_value.template get_as<unsigned int>());
+            case detail::ulong_type:
+                return vis(arg.m_value.template get_as<unsigned long>());
+            case detail::ulong_long_type:
+                return vis(arg.m_value.template get_as<unsigned long long>());
+
+            case detail::bool_type:
+                return vis(arg.m_value.template get_as<bool>());
+            case detail::char_type:
+                return vis(arg.m_value.template get_as<CharT>());
+            case detail::code_point_type:
+                return vis(arg.m_value.template get_as<code_point>());
+
+            case detail::float_type:
+                return vis(arg.m_value.template get_as<float>());
+            case detail::double_type:
+                return vis(arg.m_value.template get_as<double>());
+            case detail::long_double_type:
+                return vis(arg.m_value.template get_as<long double>());
+
+            case detail::buffer_type:
+                return vis(arg.m_value.template get_as<span<CharT>>());
+            case detail::string_type:
+                return vis(
+                    arg.m_value.template get_as<std::basic_string<CharT>>());
+            case detail::string_view_type:
+                return vis(
+                    arg.m_value.template get_as<basic_string_view<CharT>>());
+
+            case detail::custom_type:
+                return vis(typename basic_arg<CharT>::handle(
+                    arg.m_value.get_custom()));
+
+                SCN_CLANG_PUSH
+                SCN_CLANG_IGNORE("-Wcovered-switch-default")
+            default:
+                return vis(detail::monostate{});
+                SCN_CLANG_POP
+        }
+        SCN_UNREACHABLE;
+    }
+
+    namespace detail {
+        template <typename CharT, typename T>
+        struct get_type {
+            using value_type = decltype(make_value<CharT>(
+                SCN_DECLVAL(typename std::remove_reference<
+                            typename std::remove_cv<T>::type>::type&),
+                SCN_DECLVAL(priority_tag<1>)));
+            static const type value = value_type::type_tag;
+        };
+
+        template <typename CharT>
+        constexpr size_t get_types()
+        {
+            return 0;
+        }
+        template <typename CharT, typename Arg, typename... Args>
+        constexpr size_t get_types()
+        {
+            return static_cast<size_t>(get_type<CharT, Arg>::value) |
+                   (get_types<CharT, Args...>() << 5);
+        }
+
+        template <typename Context,
+                  typename ParseCtx,
+                  typename T,
+                  typename CharT>
+        SCN_CONSTEXPR14 basic_arg<CharT> make_arg(T& value) noexcept
+        {
+            basic_arg<CharT> arg;
+            arg.m_type = get_type<CharT, T>::value;
+            arg.m_value = make_value<CharT>(value, priority_tag<1>{})
+                              .template get<Context, ParseCtx>();
+            return arg;
+        }
+
+        template <bool Packed,
+                  typename Context,
+                  typename ParseCtx,
+                  typename T,
+                  typename CharT = typename Context::char_type>
+        inline auto make_arg(T& v) ->
+            typename std::enable_if<Packed, value>::type
+        {
+            return make_value<CharT>(v, priority_tag<1>{})
+                .template get<Context, ParseCtx>();
+        }
+        template <bool Packed, typename Context, typename ParseCtx, typename T>
+        inline auto make_arg(T& v) -> typename std::
+            enable_if<!Packed, basic_arg<typename Context::char_type>>::type
+        {
+            return make_arg<Context, ParseCtx>(v);
+        }
+    }  // namespace detail
+
+    template <typename CharT, typename... Args>
+    class arg_store {
+        static constexpr const size_t num_args = sizeof...(Args);
+        static const bool is_packed = num_args < detail::max_packed_args;
+
+        friend class basic_args<CharT>;
+
+        static constexpr size_t get_types()
+        {
+            return is_packed ? detail::get_types<CharT, Args...>()
+                             : detail::is_unpacked_bit | num_args;
+        }
+
+    public:
+        static constexpr size_t types = get_types();
+        using arg_type = basic_arg<CharT>;
+
+        using value_type =
+            typename std::conditional<is_packed, detail::value, arg_type>::type;
+        static constexpr size_t data_size =
+            num_args + (is_packed && num_args != 0 ? 0 : 1);
+
+        template <typename Ctx, typename ParseCtx>
+        SCN_CONSTEXPR14 arg_store(detail::ctx_tag<Ctx>,
+                                  detail::parse_ctx_tag<ParseCtx>,
+                                  Args&... a) noexcept
+            : m_data{{detail::make_arg<is_packed, Ctx, ParseCtx>(a)...}}
+        {
+        }
+
+        SCN_CONSTEXPR14 span<value_type> data() noexcept
+        {
+            return make_span(m_data.data(),
+                             static_cast<std::ptrdiff_t>(m_data.size()));
+        }
+
+    private:
+        detail::array<value_type, data_size> m_data;
+    };
+
+    template <typename Context, typename ParseCtx, typename... Args>
+    arg_store<typename Context::char_type, Args...> make_args(Args&... args)
+    {
+        return {detail::ctx_tag<Context>(), detail::parse_ctx_tag<ParseCtx>(),
+                args...};
+    }
+    template <typename WrappedRange,
+              typename Format,
+              typename... Args,
+              typename CharT = typename WrappedRange::char_type>
+    arg_store<CharT, Args...> make_args_for(WrappedRange&,
+                                            Format,
+                                            Args&... args)
+    {
+        using context_type = basic_context<WrappedRange>;
+        using parse_context_type =
+            typename detail::parse_context_template_for_format<
+                Format>::template type<typename context_type::char_type>;
+        return {detail::ctx_tag<context_type>(),
+                detail::parse_ctx_tag<parse_context_type>(), args...};
+    }
+
+    template <typename CharT>
+    class basic_args {
+    public:
+        using arg_type = basic_arg<CharT>;
+
+        constexpr basic_args() noexcept = default;
+
+        template <typename... Args>
+        SCN_CONSTEXPR14 basic_args(arg_store<CharT, Args...>& store) noexcept
+            : m_types(store.types)
+        {
+            set_data(store.m_data.data());
+        }
+
+        SCN_CONSTEXPR14 basic_args(span<arg_type> args) noexcept
+            : m_types(detail::is_unpacked_bit | args.size())
+        {
+            set_data(args.data());
+        }
+
+        SCN_CONSTEXPR14 arg_type get(std::ptrdiff_t i) const noexcept
+        {
+            return do_get(i);
+        }
+
+        SCN_NODISCARD SCN_CONSTEXPR14 bool check_id(
+            std::ptrdiff_t i) const noexcept
+        {
+            if (!is_packed()) {
+                return static_cast<size_t>(i) <
+                       (m_types &
+                        ~static_cast<size_t>(detail::is_unpacked_bit));
+            }
+            return type(i) != detail::none_type;
+        }
+
+        SCN_NODISCARD constexpr size_t max_size() const noexcept
+        {
+            return is_packed()
+                       ? static_cast<size_t>(detail::max_packed_args)
+                       : m_types &
+                             ~static_cast<size_t>(detail::is_unpacked_bit);
+        }
+
+    private:
+        size_t m_types{0};
+        union {
+            detail::value* m_values;
+            arg_type* m_args;
+        };
+
+        SCN_NODISCARD constexpr bool is_packed() const noexcept
+        {
+            return (m_types & detail::is_unpacked_bit) == 0;
+        }
+
+        SCN_NODISCARD SCN_CONSTEXPR14 typename detail::type type(
+            std::ptrdiff_t i) const noexcept
+        {
+            size_t shift = static_cast<size_t>(i) * detail::packed_arg_bitsize;
+            return static_cast<typename detail::type>(
+                (static_cast<size_t>(m_types) >> shift) &
+                detail::packed_arg_mask);
+        }
+
+        SCN_CONSTEXPR14 void set_data(detail::value* values) noexcept
+        {
+            m_values = values;
+        }
+        SCN_CONSTEXPR14 void set_data(arg_type* args) noexcept
+        {
+            m_args = args;
+        }
+
+        SCN_CONSTEXPR14 arg_type do_get(std::ptrdiff_t i) const noexcept
+        {
+            SCN_EXPECT(i >= 0);
+
+            arg_type arg;
+            if (!is_packed()) {
+                auto num_args = static_cast<std::ptrdiff_t>(max_size());
+                if (SCN_LIKELY(i < num_args)) {
+                    arg = m_args[i];
+                }
+                return arg;
+            }
+
+            SCN_EXPECT(m_values);
+            if (SCN_UNLIKELY(
+                    i > static_cast<std::ptrdiff_t>(detail::max_packed_args))) {
+                return arg;
+            }
+
+            arg.m_type = type(i);
+            if (arg.m_type == detail::none_type) {
+                return arg;
+            }
+            arg.m_value = m_values[i];
+            return arg;
+        }
+    };
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif  // SCN_DETAIL_ARGS_H
-- 
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