1 files changed, 131 insertions, 0 deletions
diff --git a/src/third-party/scnlib/include/scn/scan/common.h b/src/third-party/scnlib/include/scn/scan/common.h
new file mode 100644
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--- /dev/null
+++ b/src/third-party/scnlib/include/scn/scan/common.h
@@ -0,0 +1,131 @@
+// 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_SCAN_COMMON_H
+#define SCN_SCAN_COMMON_H
+
+#include "../detail/locale.h"
+#include "../detail/result.h"
+#include "../unicode/common.h"
+
+namespace scn {
+    SCN_BEGIN_NAMESPACE
+
+    namespace detail {
+        template <typename CharT>
+        constexpr int to_format(int i)
+        {
+            return i;
+        }
+        template <typename T>
+        constexpr auto to_format(T&& f) -> decltype(string_view{SCN_FWD(f)})
+        {
+            return {SCN_FWD(f)};
+        }
+        template <typename T>
+        constexpr auto to_format(T&& f) -> decltype(wstring_view{SCN_FWD(f)})
+        {
+            return {SCN_FWD(f)};
+        }
+        template <typename CharT>
+        basic_string_view<CharT> to_format(const std::basic_string<CharT>& str)
+        {
+            return {str.data(), str.size()};
+        }
+
+        template <typename CharT>
+        struct until_pred {
+            array<CharT, 4> until;
+            size_t size;
+
+            constexpr until_pred(CharT ch) : until({{ch}}), size(1) {}
+            until_pred(code_point cp)
+            {
+                auto ret = encode_code_point(until.begin(), until.end(), cp);
+                SCN_ENSURE(ret);
+                size = ret.value() - until.begin();
+            }
+
+            SCN_CONSTEXPR14 bool operator()(span<const CharT> ch) const
+            {
+                if (ch.size() != size) {
+                    return false;
+                }
+                for (size_t i = 0; i < ch.size(); ++i) {
+                    if (ch[i] != until[i]) {
+                        return false;
+                    }
+                }
+                return true;
+            }
+            static constexpr bool is_localized()
+            {
+                return false;
+            }
+            constexpr bool is_multibyte() const
+            {
+                return size != 1;
+            }
+        };
+
+        template <typename Error, typename Range>
+        using generic_scan_result_for_range = decltype(detail::wrap_result(
+            SCN_DECLVAL(Error),
+            SCN_DECLVAL(detail::range_tag<Range>),
+            SCN_DECLVAL(range_wrapper_for_t<Range>)));
+        template <typename Range>
+        using scan_result_for_range =
+            generic_scan_result_for_range<wrapped_error, Range>;
+    }  // namespace detail
+
+    template <typename T>
+    struct discard_type {
+        discard_type() = default;
+    };
+
+    /**
+     * Scans an instance of `T`, but doesn't store it anywhere.
+     * Uses `scn::temp` internally, so the user doesn't have to bother.
+     *
+     * \code{.cpp}
+     * int i{};
+     * // 123 is discarded, 456 is read into `i`
+     * auto result = scn::scan("123 456", "{} {}", scn::discard<T>(), i);
+     * // result == true
+     * // i == 456
+     * \endcode
+     */
+    template <typename T>
+    discard_type<T>& discard()
+    {
+        return temp(discard_type<T>{})();
+    }
+
+    template <typename T>
+    struct scanner<discard_type<T>> : public scanner<T> {
+        template <typename Context>
+        error scan(discard_type<T>&, Context& ctx)
+        {
+            T tmp;
+            return scanner<T>::scan(tmp, ctx);
+        }
+    };
+
+    SCN_END_NAMESPACE
+}  // namespace scn
+
+#endif