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// SPDX-License-Identifier: Apache-2.0
// Copyright 2024-2026, Amlal El Mahrouss (amlal@nekernel.org)
// Licensed under the Apache License, Version 2.0 (see LICENSE file)
// Official repository: https://github.com/ne-foss-org/nekernel
#ifndef NEKIT_KSTRING_H
#define NEKIT_KSTRING_H
#include <CompilerKit/CompilerKit.h>
#include <NeKit/Config.h>
#include <NeKit/ErrorOr.h>
#include <NeKit/KernelPanic.h>
#include <NeKit/Utils.h>
namespace Kernel {
inline constexpr Int kMinimumStringSize = 8196;
/// @brief Kernel string class, not dynamic.
template <typename CharKind = Char, Int MinSz = kMinimumStringSize>
class KBasicString final {
public:
KBasicString() {
fDataSz = MinSz;
fData = new CharKind[fDataSz];
if (!fData) return;
MUST_PASS(fData);
rt_set_memory(fData, 0, fDataSz);
}
KBasicString(const CharKind* In) : fDataSz(oe_string_len(In)) {
fData = new CharKind[fDataSz];
if (!fData) return;
MUST_PASS(fData);
rt_set_memory(fData, 0, fDataSz);
this->operator+=(In);
}
KBasicString(const SizeT Sz) : fDataSz(Sz) {
MUST_PASS(fDataSz > 1);
fData = new CharKind[fDataSz];
if (!fData) return;
MUST_PASS(fData);
rt_set_memory(fData, 0, fDataSz);
}
~KBasicString() {
if (fData) {
delete[] fData;
fData = nullptr;
}
}
NE_COPY_DEFAULT(KBasicString)
CharKind* Data();
const CharKind* CData() const;
Size Length() const;
bool operator==(const CharKind* rhs) const;
bool operator!=(const CharKind* rhs) const;
bool operator==(const KBasicString<CharKind, MinSz>& rhs) const;
bool operator!=(const KBasicString<CharKind, MinSz>& rhs) const;
KBasicString<CharKind, MinSz>& operator+=(const CharKind* rhs);
KBasicString<CharKind, MinSz>& operator+=(const KBasicString<CharKind, MinSz>& rhs);
operator const char*() { return fData; }
explicit operator bool() { return fData; }
bool operator!() { return fData; }
private:
CharKind* fData{nullptr};
SizeT fDataSz{};
SizeT fCur{};
friend class KStringBuilder;
};
using KString = KBasicString<>;
using KStringOr = ErrorOr<KString>;
class KStringBuilder final {
public:
template <typename CharKind = Char, Int MinSz = kMinimumStringSize>
static ErrorOr<KBasicString<CharKind, MinSz>> Construct(const CharKind* data);
template <typename CharKind = Char>
static const CharKind* FromBool(const CharKind* fmt, bool n);
template <typename CharKind = Char>
static const CharKind* Format(const CharKind* fmt, const CharKind* from);
template <typename CharKind = Char>
static bool Equals(const CharKind* lhs, const CharKind* rhs);
};
} // namespace Kernel
#include <NeKit/KString.inl>
#endif
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