| 1 | // Copyright (C) 2018 Crimson AS <info@crimson.no> |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | // |
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| 5 | // W A R N I N G |
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| 6 | // ------------- |
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| 7 | // |
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| 8 | // This file is not part of the Qt API. It exists purely as an |
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| 9 | // implementation detail. This header file may change from version to |
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| 10 | // version without notice, or even be removed. |
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| 11 | // |
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| 12 | // We mean it. |
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| 13 | // |
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| 14 | |
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| 15 | #ifndef QV4ESTABLE_P_H |
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| 16 | #define QV4ESTABLE_P_H |
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| 17 | |
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| 18 | #include <vector> |
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| 19 | #include <limits> |
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| 20 | |
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| 21 | #include <QtCore/q20vector.h> |
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| 22 | |
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| 23 | #include "qv4value_p.h" |
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| 24 | |
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| 25 | class tst_qv4estable; |
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| 26 | |
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| 27 | QT_BEGIN_NAMESPACE |
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| 28 | |
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| 29 | namespace QV4 { |
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| 30 | |
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| 31 | class Q_AUTOTEST_EXPORT ESTable |
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| 32 | { |
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| 33 | public: |
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| 34 | // Can be used to observe changes in the position of the element at index pivot by registering an instance |
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| 35 | // with `observeShifts`. |
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| 36 | // This is used by implementations of `forEach`, for `ESTable` |
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| 37 | // backed collections, to respect the correct order of iteration |
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| 38 | // in the face of a `callbackFn` that mutates the collection |
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| 39 | // itself. |
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| 40 | struct ShiftObserver { |
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| 41 | static constexpr uint OUT_OF_TABLE = std::numeric_limits<uint>::max(); |
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| 42 | |
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| 43 | uint pivot = 0; |
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| 44 | |
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| 45 | void next() { |
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| 46 | pivot = pivot == OUT_OF_TABLE ? 0 : pivot + 1; |
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| 47 | } |
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| 48 | }; |
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| 49 | |
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| 50 | public: |
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| 51 | ESTable(); |
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| 52 | ~ESTable(); |
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| 53 | |
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| 54 | void markObjects(MarkStack *s, bool isWeakMap); |
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| 55 | void clear(); |
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| 56 | void set(const Value &k, const Value &v); |
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| 57 | bool has(const Value &k) const; |
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| 58 | ReturnedValue get(const Value &k, bool *hasValue = nullptr) const; |
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| 59 | bool remove(const Value &k); |
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| 60 | uint size() const; |
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| 61 | void iterate(uint idx, Value *k, Value *v); |
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| 62 | |
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| 63 | void removeUnmarkedKeys(); |
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| 64 | |
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| 65 | inline void observeShifts(ShiftObserver& observer) { |
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| 66 | if (std::find(first: m_observers.cbegin(), last: m_observers.cend(), val: &observer) == m_observers.cend()) |
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| 67 | m_observers.push_back(x: &observer); |
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| 68 | } |
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| 69 | inline void stopObservingShifts(ShiftObserver& observer) { |
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| 70 | q20::erase(c&: m_observers, value: &observer); |
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| 71 | } |
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| 72 | |
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| 73 | private: |
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| 74 | friend class ::tst_qv4estable; |
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| 75 | |
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| 76 | Value *m_keys = nullptr; |
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| 77 | Value *m_values = nullptr; |
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| 78 | uint m_size = 0; |
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| 79 | uint m_capacity = 0; |
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| 80 | |
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| 81 | std::vector<ShiftObserver*> m_observers; |
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| 82 | }; |
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| 83 | |
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| 84 | } // namespace QV4 |
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| 85 | |
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| 86 | QT_END_NAMESPACE |
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| 87 | |
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| 88 | #endif |
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| 89 | |
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