gstring.hpp

// Copyright Take Vos 2019-2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "grapheme.hpp"
#include "../strings.hpp"
#include <vector>
 
namespace tt {
 
struct gstring {
    std::vector<grapheme> graphemes;
 
    using const_iterator = std::vector<grapheme>::const_iterator;
    using value_type = grapheme;
 
    ssize_t size() const noexcept {
        return std::ssize(graphemes);
    }
 
    grapheme const &at(ssize_t i) const {
        return graphemes.at(i);
    }
 
    grapheme &at(ssize_t i) {
        return graphemes.at(i);
    }
 
    decltype(auto) begin() noexcept { return graphemes.begin(); }
    decltype(auto) begin() const noexcept { return graphemes.begin(); }
    decltype(auto) cbegin() const noexcept { return graphemes.cbegin(); }
    decltype(auto) end() noexcept { return graphemes.end(); }
    decltype(auto) end() const noexcept { return graphemes.end(); }
    decltype(auto) cend() const noexcept { return graphemes.cend(); }
 
    decltype(auto) front() noexcept { return graphemes.front(); }
    decltype(auto) front() const noexcept { return graphemes.front(); }
    decltype(auto) back() noexcept { return graphemes.back(); }
    decltype(auto) back() const noexcept { return graphemes.back(); }
 
    gstring &operator+=(gstring const &rhs) noexcept {
        for (ttlet &rhs_grapheme: rhs.graphemes) {
            graphemes.push_back(rhs_grapheme);
        }
        return *this;
    }
 
    gstring &operator+=(grapheme const &grapheme) noexcept {
        graphemes.push_back(grapheme);
        return *this;
    }
 
    [[nodiscard]] friend std::u32string to_u32string(gstring const &rhs) noexcept {
        std::u32string r;
        r.reserve(std::ssize(rhs));
        for (ttlet &c : rhs) {
            r += c.NFC();
        }
        return r;
    }
 
    [[nodiscard]] friend std::string to_string(gstring const &rhs) noexcept {
        return tt::to_string(to_u32string(rhs));
    }
 
 
    friend std::ostream &operator<<(std::ostream &lhs, gstring const &rhs) {
        return lhs << to_string(rhs);
    }
};
 
[[nodiscard]] gstring to_gstring(std::u32string_view rhs) noexcept;
 
[[nodiscard]] inline gstring to_gstring(std::string_view rhs) noexcept
{
    return to_gstring(to_u32string(rhs));
}
 
 
}