Add compile time manipulatable strings

include/rexy/cx/string.hpp

@@ -0,0 +1,178 @@
+/**
+	This file is a part of rexy's general purpose library
+	Copyright (C) 2020 rexy712
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef REXY_CX_STRING_HPP
+#define REXY_CX_STRING_HPP
+
+#include "../string_base.hpp"
+#include "utility.hpp"
+
+
+//This is different from rexy::static_string in that this doesn't hold a pointer to a constant string array.
+//This holds a mutable array of data which can be modified during compile time. static_string is
+//designed to be a thin wrapper around a raw char*, this is designed to allow compile time string concatenation
+
+namespace rexy::cx{
+
+	template<size_t N>
+	class string
+	{
+	public:
+		static constexpr size_t max_size = N;
+	private:
+		char m_data[N] = {};
+		size_t m_length = 0;
+
+	public:
+		constexpr string(void) = default;
+		template<size_t M>
+		constexpr string(const char(&data)[M]):
+			m_length(M)
+		{
+			static_assert(M <= N);
+			for(size_t i = 0;i < M;++i){
+				m_data[i] = data[i];
+			}
+		}
+		constexpr string(const char* data):
+			m_length(cx::strlen(data))
+		{
+			for(size_t i = 0;i < m_length;++i){
+				m_data[i] = data[i];
+			}
+		}
+		constexpr string(const char* data, size_t len):
+			m_length(len)
+		{
+			for(size_t i = 0;i < m_length;++i){
+				m_data[i] = data[i];
+			}
+		}
+
+		constexpr string(const rexy::static_string& str):
+			m_length(str.length())
+		{
+			for(size_t i = 0;i < m_length;++i){
+				m_data[i] = str[i];
+			}
+		}
+		template<class Left, class Right>
+		constexpr string(const rexy::string_cat_expr<Left,Right>& expr){
+			rexy::detail::string_appender<cx::string<N>> append(*this);
+			append(expr);
+		}
+
+		constexpr string(const string&) = default;
+		constexpr string(string&&) = default;
+		~string(void) = default;
+
+		constexpr string& operator=(const char* c){
+			m_length = cx::strlen(c);
+			for(size_t i = 0;i < m_length;++i){
+				m_data[i] = c[i];
+			}
+			return *this;
+		}
+		constexpr string& operator=(const string&) = default;
+		constexpr string& operator=(string&&) = default;
+
+
+		constexpr size_t length(void)const{
+			return m_length;
+		}
+		constexpr size_t capacity(void)const{
+			return max_size;
+		}
+		constexpr char* get(void){
+			return m_data;
+		}
+		constexpr const char* get(void)const{
+			return m_data;
+		}
+		constexpr operator char*(void){
+			return m_data;
+		}
+		constexpr operator const char*(void)const{
+			return m_data;
+		}
+
+		constexpr bool valid(void)const{
+			return m_length > 0;
+		}
+		constexpr char& operator[](size_t i){
+			return m_data[i];
+		}
+		constexpr const char& operator[](size_t i)const{
+			return m_data[i];
+		}
+
+		constexpr bool resize(size_t i){
+			if(i >= capacity())
+				return false;
+			m_length = i;
+			m_data[m_length] = 0;
+			return true;
+		}
+
+		constexpr void append(const char* data, size_t len){
+			for(size_t i = 0;i < len;++i){
+				m_data[m_length++] = data[i];
+			}
+		}
+		constexpr void append(const char* data){
+			append(data, cx::strlen(data));
+		}
+		constexpr void append(const string& s){
+			append(s.get(), s.length());
+		}
+		constexpr void append(const rexy::static_string& s){
+			append(s.get(), s.length());
+		}
+	};
+
+	namespace detail{
+		template<class T>
+		struct is_cx_string_helper{
+			static constexpr bool value = false;
+		};
+		template<size_t N>
+		struct is_cx_string_helper<cx::string<N>>{
+			static constexpr bool value = true;
+		};
+		template<class... Ts>
+		struct is_cx_string{
+			static constexpr bool value = (is_cx_string_helper<std::decay_t<Ts>>::value && ...);
+		};
+	}
+
+	template<class Str1, class Str2, std::enable_if_t<detail::is_cx_string<Str1,Str2>::value,int> = 0>
+	constexpr auto operator+(Str1&& l, Str2&& r){
+		return string_cat_expr(std::forward<Str1>(l), std::forward<Str2>(r));
+	}
+	template<class Str1, std::enable_if_t<detail::is_cx_string<Str1>::value,int> = 0>
+	constexpr auto operator+(Str1&& l, const char* r){
+		return string_cat_expr(std::forward<Str1>(l), rexy::static_string(r));
+	}
+	template<class Str1, std::enable_if_t<detail::is_cx_string<Str1>::value,int> = 0>
+	constexpr auto operator+(const char* l, Str1&& r){
+		return string_cat_expr(rexy::static_string(l), std::forward<Str1>(r));
+	}
+}
+
+
+#endif

include/rexy/cx/string_hash.hpp

@@ -20,20 +20,27 @@
 #define REXY_CX_STRING_HASH_HPP
 
 #include "hash.hpp"
-#include "../string_base.hpp"
+#include "../string.hpp"
+#include "string.hpp"
 
 namespace rexy::cx{
 
-	template<>
-	struct hash<rexy::static_string>{
-		constexpr size_t operator()(const rexy::static_string& t, size_t salt = 0){
+	template<class Str>
+	struct string_hash{
+		constexpr size_t operator()(const Str& s, size_t salt = 0){
 			size_t hash = 5381 + salt;
-			for(size_t i = 0;i < t.length();++i){
-				hash = ((hash << 5) + hash) ^ t[i];
+			for(size_t i = 0;i < s.length();++i){
+				hash = ((hash << 5) + hash) ^ s[i];
 			}
 			return hash;
 		}
 	};
+	template<>
+	struct hash<rexy::static_string> : public string_hash<rexy::static_string>{};
+	template<>
+	struct hash<rexy::string> : public string_hash<rexy::string>{};
+	template<size_t N>
+	struct hash<rexy::cx::string<N>> : public string_hash<rexy::cx::string<N>>{};
 
 }