rexylib/include/rexy/string_view.tpp

/**
	This file is a part of rexy's general purpose library
	Copyright (C) 2020-2022 rexy712

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU 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 General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef REXY_STRING_VIEW_TPP
#define REXY_STRING_VIEW_TPP

#include "compat/to_address.hpp"
#include "utility.hpp"
#include "string_base.hpp"

namespace rexy{

	template<class Char>
	constexpr basic_string_view<Char>::basic_string_view(const_pointer str, size_type len)noexcept:
		m_data(str), m_length(len){}
	template<class Char>
	constexpr basic_string_view<Char>::basic_string_view(const string_base<Char>& s)noexcept:
		m_data(s.c_str()), m_length(s.length()){}
	template<class Char>
	template<class InIter>
	constexpr basic_string_view<Char>::basic_string_view(InIter start, InIter fin)noexcept:
		basic_string_view(compat::to_address(start), fin - start){}

	template<class Char>
	constexpr basic_string_view<Char>::basic_string_view(const_pointer c)noexcept:
		basic_string_view(c, strlen(c)){}
	template<class Char>
	constexpr basic_string_view<Char>& basic_string_view<Char>::operator=(const_pointer c)noexcept{
		m_data = c;
		m_length = strlen(c);
		return *this;
	}

	template<class Char>
	constexpr auto basic_string_view<Char>::search(const basic_string_view& s)const -> const_iterator{
		return two_way_search(cbegin(), cend(), s.cbegin(), s.cend());
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::search(const_pointer c)const -> const_iterator{
		basic_string_view tmp(c);
		return search(tmp);
	}
	template<class Char>
	template<class Searcher>
	constexpr auto basic_string_view<Char>::search(const basic_string_view& s, const Searcher& searcher)const -> const_iterator{
		return searcher(cbegin(), cend(), s.cbegin(), s.cend());
	}
	template<class Char>
	template<class Searcher>
	constexpr auto basic_string_view<Char>::search(const_pointer c, const Searcher& searcher)const -> const_iterator{
		basic_string_view tmp(c);
		return search(tmp, searcher);
	}

	template<class Char>
	constexpr basic_string_view<Char> basic_string_view<Char>::substr(size_type pos, size_type count)const{
		const size_type real_count = rexy::min(count, length() - pos);
		return basic_string_view{m_data + pos, real_count};
	}

	template<class Char>
	constexpr void basic_string_view<Char>::remove_prefix(size_type i){
		if(i > m_length){
			m_data = end();
			m_length = 0;
		}else{
			m_data = begin() + i;
			m_length -= i;
		}
	}
	template<class Char>
	constexpr void basic_string_view<Char>::remove_suffix(size_type i){
		if(i > m_length){
			m_length = 0;
		}else{
			m_length -= i;
		}
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_first_of(value_type v, size_type start)const -> size_type{
		if(start >= m_length){
			return npos;
		}
		for(auto it = begin() + start;it != end();++it){
			if(*it == v){
				return it - begin();
			}
		}
		return npos;
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_first_of(const_pointer c, size_type start)const -> size_type{
		return find_first_of(c, start, ::rexy::strlen(c));
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_first_of(const_pointer c, size_type start, size_type size)const -> size_type{
		if(start > m_length){
			return npos;
		}
		for(auto it = begin() + start;it != end();++it){
			for(size_type i = 0;i < size;++i){
				if(*it == c[i]){
					return it - begin();
				}
			}
		}
		return npos;
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_last_of(value_type v, size_type start)const -> size_type{
		if(start >= m_length){
			return npos;
		}
		const auto b = end() - 1;
		const auto e = begin() - 1 - start;

		for(auto it = b;it != e;--it){
			if(*it == v){
				return it - begin();
			}
		}
		return npos;
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_last_of(const_pointer c, size_type start)const -> size_type{
		return find_last_of(c, start, ::rexy::strlen(c));
	}
	template<class Char>
	constexpr auto basic_string_view<Char>::find_last_of(const_pointer c, size_type start, size_type size)const -> size_type{
		if(start > m_length){
			return npos;
		}

		const auto b = end() - 1;
		const auto e = begin() - 1 - start;

		for(auto it = b;it != e;--it){
			for(size_type i = 0;i < size;++i){
				if(*it == c[i]){
					return it - begin();
				}
			}
		}
		return npos;
	}

}

#endif