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/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullOwnPtr.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/Value.h>
namespace JS {
struct ValueAndAttributes {
Value value;
PropertyAttributes attributes { default_attributes };
};
class IndexedProperties;
class IndexedPropertyIterator;
class GenericIndexedPropertyStorage;
class IndexedPropertyStorage {
public:
virtual ~IndexedPropertyStorage() = default;
virtual bool has_index(u32 index) const = 0;
virtual Optional<ValueAndAttributes> get(u32 index) const = 0;
virtual void put(u32 index, Value value, PropertyAttributes attributes = default_attributes) = 0;
virtual void remove(u32 index) = 0;
virtual ValueAndAttributes take_first() = 0;
virtual ValueAndAttributes take_last() = 0;
virtual size_t size() const = 0;
virtual size_t array_like_size() const = 0;
virtual bool set_array_like_size(size_t new_size) = 0;
virtual bool is_simple_storage() const { return false; }
};
class SimpleIndexedPropertyStorage final : public IndexedPropertyStorage {
public:
SimpleIndexedPropertyStorage() = default;
explicit SimpleIndexedPropertyStorage(Vector<Value>&& initial_values);
virtual bool has_index(u32 index) const override;
virtual Optional<ValueAndAttributes> get(u32 index) const override;
virtual void put(u32 index, Value value, PropertyAttributes attributes = default_attributes) override;
virtual void remove(u32 index) override;
virtual ValueAndAttributes take_first() override;
virtual ValueAndAttributes take_last() override;
virtual size_t size() const override { return m_packed_elements.size(); }
virtual size_t array_like_size() const override { return m_array_size; }
virtual bool set_array_like_size(size_t new_size) override;
virtual bool is_simple_storage() const override { return true; }
const Vector<Value>& elements() const { return m_packed_elements; }
private:
friend GenericIndexedPropertyStorage;
void grow_storage_if_needed();
size_t m_array_size { 0 };
Vector<Value> m_packed_elements;
};
class GenericIndexedPropertyStorage final : public IndexedPropertyStorage {
public:
explicit GenericIndexedPropertyStorage(SimpleIndexedPropertyStorage&&);
explicit GenericIndexedPropertyStorage() = default;
virtual bool has_index(u32 index) const override;
virtual Optional<ValueAndAttributes> get(u32 index) const override;
virtual void put(u32 index, Value value, PropertyAttributes attributes = default_attributes) override;
virtual void remove(u32 index) override;
virtual ValueAndAttributes take_first() override;
virtual ValueAndAttributes take_last() override;
virtual size_t size() const override { return m_sparse_elements.size(); }
virtual size_t array_like_size() const override { return m_array_size; }
virtual bool set_array_like_size(size_t new_size) override;
const HashMap<u32, ValueAndAttributes>& sparse_elements() const { return m_sparse_elements; }
private:
size_t m_array_size { 0 };
HashMap<u32, ValueAndAttributes> m_sparse_elements;
};
class IndexedPropertyIterator {
public:
IndexedPropertyIterator(const IndexedProperties&, u32 starting_index, bool skip_empty);
IndexedPropertyIterator& operator++();
IndexedPropertyIterator& operator*();
bool operator!=(const IndexedPropertyIterator&) const;
u32 index() const { return m_index; };
private:
void skip_empty_indices();
const IndexedProperties& m_indexed_properties;
Vector<u32> m_cached_indices;
u32 m_index { 0 };
bool m_skip_empty { false };
};
class IndexedProperties {
public:
IndexedProperties() = default;
explicit IndexedProperties(Vector<Value> values)
{
if (!values.is_empty())
m_storage = make<SimpleIndexedPropertyStorage>(move(values));
}
bool has_index(u32 index) const { return m_storage ? m_storage->has_index(index) : false; }
Optional<ValueAndAttributes> get(u32 index) const;
void put(u32 index, Value value, PropertyAttributes attributes = default_attributes);
void remove(u32 index);
void append(Value value, PropertyAttributes attributes = default_attributes) { put(array_like_size(), value, attributes); }
IndexedPropertyIterator begin(bool skip_empty = true) const { return IndexedPropertyIterator(*this, 0, skip_empty); };
IndexedPropertyIterator end() const { return IndexedPropertyIterator(*this, array_like_size(), false); };
bool is_empty() const { return array_like_size() == 0; }
size_t array_like_size() const { return m_storage ? m_storage->array_like_size() : 0; }
bool set_array_like_size(size_t);
size_t real_size() const;
Vector<u32> indices() const;
template<typename Callback>
void for_each_value(Callback callback)
{
if (!m_storage)
return;
if (m_storage->is_simple_storage()) {
for (auto& value : static_cast<SimpleIndexedPropertyStorage&>(*m_storage).elements())
callback(value);
} else {
for (auto& element : static_cast<const GenericIndexedPropertyStorage&>(*m_storage).sparse_elements())
callback(element.value.value);
}
}
private:
void switch_to_generic_storage();
void ensure_storage();
OwnPtr<IndexedPropertyStorage> m_storage;
};
}
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