core/utils/String.h

#ifndef CORE_STRING_H
#define CORE_STRING_H

#include "utils/Check.h"
#include "utils/Types.h"
#include "utils/Utility.h"

namespace Core {
    class String final {
        int length;
        Hash hash;
        static constexpr int DATA_LENGTH =
            (1024 - (sizeof(length) >= sizeof(hash) ? sizeof(length) * 2
                                                    : sizeof(hash) * 2)) /
            sizeof(u32);
        u32 data[DATA_LENGTH];

    public:
        String();

        template<typename T>
        String(const T& t) : String() {
            append(t);
        }

        bool operator==(const char* s) const;
        bool operator==(const String& other) const;
        bool operator!=(const char* s) const;
        bool operator!=(const String& other) const;
        u32 operator[](int index) const;

        int getLength() const;

        String& append(char c);
        String& append(signed char c);
        String& append(unsigned char c);

        String& append(const char* s);
        String& append(const signed char* s);
        String& append(const unsigned char* s);

        String& append(signed short s);
        String& append(unsigned short s);

        String& append(signed int i);
        String& append(unsigned int i);

        String& append(signed long l);
        String& append(unsigned long l);

        String& append(signed long long ll);
        String& append(unsigned long long ll);

        String& append(float f);
        String& append(double d);
        String& append(long double ld);

        String& append(bool b);

        String& appendUnicode(u32 c);
        check_format(2, 3) String& appendFormat(const char* format, ...);

        template<typename T>
        String& append(const T& t) {
            t.toString(*this);
            return *this;
        }

        void toString(String& s) const;

        String& clear();
        Hash hashCode() const;
        void print() const;
        void printLine() const;

        template<typename... Args>
        static String format(const String& format, Args&&... args) {
            String s;
            formatBuffer(s, 0, format, Core::forward<Args>(args)...);
            return s;
        }

    private:
        void addToHash(u32 u);

        template<typename T, typename... Args>
        static void formatBuffer(String& s, int index, const String& format,
                                 const T& t, Args&&... args) {
            while(index < format.getLength()) {
                u32 u = format[index++];
                if(u == '#') {
                    if(index < format.getLength() && format[index] != '#') {
                        break;
                    }
                    index++;
                }
                s.appendUnicode(u);
            }
            s.append(t);
            formatBuffer(s, index, format, Core::forward<Args>(args)...);
        }

        static void formatBuffer(String& s, int index, const String& format) {
            while(index < format.getLength()) {
                s.appendUnicode(format[index++]);
            }
        }
    };
}

static_assert(sizeof(Core::String) == 1024,
              "String should have a size of 1024 byte");

bool operator==(const char* cs, const Core::String& s);
bool operator!=(const char* cs, const Core::String& s);

#endif