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Runtime/Includes/Core/Format.inl

@@ -0,0 +1,137 @@
+#pragma once
+#include <Core/Format.h>
+
+#include <sstream>
+#include <ostream>
+
+// TODO : make single functions that manages stringstreams and ostreams
+namespace Scop
+{
+	namespace Internal
+	{
+		template<typename It>
+		void Format(std::stringstream& ss, It first, It last)
+		{
+			for(auto it = first; it != last; ++it)
+			{
+				switch(*it)
+				{
+					case '%':
+						throw std::invalid_argument{"too few arguments"};
+					case '/':
+						++it;
+						if(it == last)
+							throw std::invalid_argument{"stray '/'"};
+						[[fallthrough]];
+
+					default: ss << *it;
+				}
+			}
+		}
+
+		template<typename It, typename T, typename... Args>
+		void Format(std::stringstream& ss, It first, It last, const T& arg, const Args&... args)
+		{
+			for(auto it = first; it != last; ++it)
+			{
+				switch(*it)
+				{
+					case '%':
+						ss << arg;
+						return Format(ss, ++it, last, args...);
+					case '/':
+						++it;
+						if(it == last)
+							throw std::invalid_argument{"stray '/'"};
+						[[fallthrough]];
+
+					default: ss << *it;
+				}
+			}
+			throw std::invalid_argument{"too many arguments"};
+		}
+
+		template<typename It>
+		void Format(std::ostream& os, It first, It last)
+		{
+			for(auto it = first; it != last; ++it)
+			{
+				switch(*it)
+				{
+					case '%':
+						throw std::invalid_argument{"too few arguments"};
+					case '/':
+						++it;
+						if(it == last)
+							throw std::invalid_argument{"stray '/'"};
+						[[fallthrough]];
+
+					default: os << *it;
+				}
+			}
+		}
+
+		template<typename It, typename T, typename... Args>
+		void Format(std::ostream& os, It first, It last, const T& arg, const Args&... args)
+		{
+			for(auto it = first; it != last; ++it)
+			{
+				switch(*it)
+				{
+					case '%':
+						os << arg;
+						return Format(os, ++it, last, args...);
+					case '/':
+						++it;
+						if(it == last)
+							throw std::invalid_argument{"stray '/'"};
+						[[fallthrough]];
+
+					default: os << *it;
+				}
+			}
+			throw std::invalid_argument{"too many arguments"};
+		}
+
+		template<typename... Args>
+		struct Formatter
+		{
+			std::string_view format;
+			std::tuple<const Args&...> args;
+		};
+
+		template<typename... Args, std::size_t... Is>
+		void FormatHelper(std::stringstream& ss, const Formatter<Args...>& formatter, std::index_sequence<Is...>)
+		{
+			Format(ss, formatter.format.begin(), formatter.format.end(),
+			std::get<Is>(formatter.args)...);
+		}
+
+		template<typename... Args>
+		std::stringstream& operator<<(std::stringstream& ss, const Formatter<Args...>& printer)
+		{
+			FormatHelper(ss, printer, std::index_sequence_for<Args...>{});
+			return ss;
+		}
+
+		template<typename... Args, std::size_t... Is>
+		void FormatHelper(std::ostream& os, const Formatter<Args...>& formatter, std::index_sequence<Is...>)
+		{
+			Format(os, formatter.format.begin(), formatter.format.end(),
+			std::get<Is>(formatter.args)...);
+		}
+
+		template<typename... Args>
+		std::ostream& operator<<(std::ostream& os, const Formatter<Args...>& printer)
+		{
+			FormatHelper(os, printer, std::index_sequence_for<Args...>{});
+			return os;
+		}
+	}
+
+	template<typename... Args, std::enable_if_t<std::conjunction_v<IsOstreamable<Args>...>, int>>
+	auto Format(std::string_view format, const Args&... args)
+	{
+		return Internal::Formatter<Args...>{format, std::forward_as_tuple(args...)};
+	}
+}