1 files changed, 126 insertions, 0 deletions
diff --git a/src/third-party/scnlib/include/scn/detail/context.h b/src/third-party/scnlib/include/scn/detail/context.h
new file mode 100644
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--- /dev/null
+++ b/src/third-party/scnlib/include/scn/detail/context.h
@@ -0,0 +1,126 @@
+// 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_CONTEXT_H
+#define SCN_DETAIL_CONTEXT_H
+
+#include "args.h"
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    template <typename WrappedRange>
+    class basic_context {
+    public:
+        using range_type = WrappedRange;
+        using iterator = typename range_type::iterator;
+        using sentinel = typename range_type::sentinel;
+        using char_type = typename range_type::char_type;
+        using locale_type = basic_locale_ref<char_type>;
+
+        basic_context(range_type&& r) : m_range(SCN_MOVE(r)) {}
+        basic_context(range_type&& r, locale_type&& loc)
+            : m_range(SCN_MOVE(r)), m_locale(SCN_MOVE(loc))
+        {
+        }
+
+        SCN_NODISCARD iterator& begin()
+        {
+            return m_range.begin();
+        }
+        const sentinel& end() const
+        {
+            return m_range.end();
+        }
+
+        range_type& range() & noexcept
+        {
+            return m_range;
+        }
+        const range_type& range() const& noexcept
+        {
+            return m_range;
+        }
+        range_type range() && noexcept
+        {
+            return m_range;
+        }
+
+        locale_type& locale() noexcept
+        {
+            return m_locale;
+        }
+        const locale_type& locale() const noexcept
+        {
+            return m_locale;
+        }
+
+    private:
+        range_type m_range;
+        locale_type m_locale{};
+    };
+
+    template <typename WrappedRange,
+              typename CharT = typename WrappedRange::char_type>
+    basic_context<WrappedRange> make_context(WrappedRange r)
+    {
+        return {SCN_MOVE(r)};
+    }
+    template <typename WrappedRange, typename LocaleRef>
+    basic_context<WrappedRange> make_context(WrappedRange r, LocaleRef&& loc)
+    {
+        return {SCN_MOVE(r), SCN_FWD(loc)};
+    }
+
+    template <typename CharT>
+    auto get_arg(const basic_args<CharT>& args, std::ptrdiff_t id)
+        -> expected<basic_arg<CharT>>
+    {
+        auto a = args.get(id);
+        if (!a) {
+            return error(error::invalid_format_string,
+                         "Argument id out of range");
+        }
+        return a;
+    }
+    template <typename CharT, typename ParseCtx>
+    auto get_arg(const basic_args<CharT>& args,
+                 ParseCtx& pctx,
+                 std::ptrdiff_t id) -> expected<basic_arg<CharT>>
+    {
+        return pctx.check_arg_id(id) ? get_arg(args, id)
+                                     : error(error::invalid_format_string,
+                                             "Argument id out of range");
+    }
+    template <typename CharT, typename ParseCtx>
+    auto get_arg(const basic_args<CharT>&, ParseCtx&, basic_string_view<CharT>)
+        -> expected<basic_arg<CharT>>
+    {
+        return error(error::invalid_format_string, "Argument id out of range");
+    }
+
+    template <typename CharT, typename ParseCtx>
+    auto next_arg(const basic_args<CharT>& args, ParseCtx& pctx)
+        -> expected<basic_arg<CharT>>
+    {
+        return get_arg(args, pctx.next_arg_id());
+    }
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif  // SCN_DETAIL_CONTEXT_H