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/* ========================================
Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
======================================== */
#pragma once
#include <CompilerKit/CompilerKit.h>
#include <NeKit/Array.h>
#include <NeKit/Config.h>
#define RTL_TRY_FIND_NODE(NAME, NODE) \
auto* NAME = NODE; \
while (NAME) { \
if (NAME->fIndex == Index) return NAME->fVal; \
NAME = NAME->fNext; \
}
#define RTL_TRY_FIND_NODE2(NAME, NODE) \
auto* NAME = NODE; \
while (NAME) { \
if (NAME->fIndex == Index) return Ref<T>{NAME->fVal}; \
NAME = NAME->fNext; \
}
#define RTL_TRY_REMOVE_NODE(NODE) \
if (NODE && NODE->fIndex == Index) { \
NODE->fUsed = false; \
NODE->fIndex = 0; \
\
return true; \
}
// FIXME: this is a shitty algorithm, because it is memory heavy.
// Remove and occurences of that, and remove that class.
namespace Kernel {
template <typename T>
class MutableArray;
template <typename T, T _PlaceHolderValue>
class NullableMutableArray;
template <typename T>
class MutableLinkedList {
public:
T fVal;
SizeT fIndex{0};
Boolean fUsed{false};
MutableLinkedList* fPrev{nullptr};
MutableLinkedList* fNext{nullptr};
};
template <typename T, T _PlaceHolderValue>
class NullableMutableArray {
public:
// explicit this.
explicit NullableMutableArray() : fFirstNode(new MutableLinkedList<T>()) {}
/*
* We free all the nodes allocated by the array
* and store the next one inside "NextIt"
*/
virtual ~NullableMutableArray() {
auto* It = fFirstNode;
MutableLinkedList<T>* NextIt = nullptr;
while (It) {
NextIt = It->fNext;
delete It;
It = NextIt;
}
}
NullableMutableArray& operator=(const NullableMutableArray&) = default;
NullableMutableArray(const NullableMutableArray&) = default;
operator bool() { return Count() > 1; }
public:
T operator[](SizeT Index) const {
RTL_TRY_FIND_NODE(first, fFirstNode);
RTL_TRY_FIND_NODE(last, fLastNode);
return _PlaceHolderValue;
}
SizeT Count() const { return fNodeCount; }
public:
Boolean Remove(SizeT Index) {
RTL_TRY_REMOVE_NODE(fFirstNode);
RTL_TRY_REMOVE_NODE(fLastNode);
return false;
}
Boolean Add(const T val) {
auto* iterationNode = fFirstNode;
MUST_PASS(iterationNode);
while (iterationNode) {
if (!iterationNode->fUsed) {
iterationNode->fVal = val;
iterationNode->fIndex = 0;
iterationNode->fUsed = true;
++fNodeCount;
return true;
}
iterationNode = iterationNode->fNext;
}
return false;
}
private:
/* Avoid useless lookups */
MutableLinkedList<T>* fLastNode{nullptr};
MutableLinkedList<T>* fFirstNode{nullptr};
/* Number of nodes inside of this dynamic array. */
Kernel::SizeT fNodeCount{0};
private:
// don't remove that
friend MutableArray<T>;
};
template <typename T>
class MutableArray : public NullableMutableArray<voidPtr, nullptr> {
public:
// explicit this.
explicit MutableArray() = default;
virtual ~MutableArray() = default;
NE_COPY_DEFAULT(MutableArray)
public:
Boolean Add(const T val) {
auto* iterationNode = fFirstNode;
if (!iterationNode) {
fFirstNode = new MutableLinkedList<T>();
iterationNode = fFirstNode;
}
MUST_PASS(iterationNode);
while (iterationNode) {
if (!iterationNode->fUsed) {
iterationNode->fVal = val;
iterationNode->fIndex = 0;
iterationNode->fUsed = true;
++fNodeCount;
return true;
}
iterationNode = iterationNode->fNext;
}
return false;
}
public:
Ref<T> operator[](SizeT Index) const {
RTL_TRY_FIND_NODE2(first, fFirstNode);
RTL_TRY_FIND_NODE2(last, fLastNode);
return {};
}
SizeT Count() const { return fNodeCount; }
bool Contains(T& value) {
MutableLinkedList<T>* first = fFirstNode;
while (first) {
if (first->fVal == value && first->fUsed) return true;
first = first->fNext;
}
return false;
}
private:
/* Avoid useless lookups */
MutableLinkedList<T>* fLastNode{nullptr};
MutableLinkedList<T>* fFirstNode{nullptr};
/* Number of nodes inside of this dynamic array. */
Kernel::SizeT fNodeCount{0};
};
} // namespace Kernel
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