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300 lines
11 KiB
C++
300 lines
11 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Concepts.h>
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#include <AK/Forward.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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namespace AK {
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namespace Detail {
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template<typename TypeA, typename Default>
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struct SubstituteIfVoid {
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using Type = TypeA;
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};
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template<typename Default>
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struct SubstituteIfVoid<void, Default> {
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using Type = Default;
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};
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template<typename DeclaredBaseType, typename DefaultBaseType, typename ValueType, typename MetadataT, typename ValueTraits>
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class Trie {
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using BaseType = typename SubstituteIfVoid<DeclaredBaseType, DefaultBaseType>::Type;
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public:
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using MetadataType = MetadataT;
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Trie(ValueType value, Optional<MetadataType> metadata)
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: m_value(move(value))
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, m_metadata(move(metadata))
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{
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}
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template<typename It>
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BaseType& traverse_until_last_accessible_node(It& it, It const& end)
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{
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Trie* node = this;
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for (; it < end; ++it) {
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auto next_it = node->m_children.find(*it);
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if (next_it == node->m_children.end())
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return static_cast<BaseType&>(*node);
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node = &*(*next_it).value;
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}
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return static_cast<BaseType&>(*node);
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}
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template<typename It>
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BaseType const& traverse_until_last_accessible_node(It& it, It const& end) const { return const_cast<Trie*>(this)->traverse_until_last_accessible_node(it, end); }
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template<typename It>
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BaseType& traverse_until_last_accessible_node(It const& begin, It const& end)
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{
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auto it = begin;
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return const_cast<Trie*>(this)->traverse_until_last_accessible_node(it, end);
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}
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template<typename It>
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BaseType const& traverse_until_last_accessible_node(It const& begin, It const& end) const
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{
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auto it = begin;
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return const_cast<Trie*>(this)->traverse_until_last_accessible_node(it, end);
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}
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Optional<MetadataType> metadata() const
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requires(!IsNullPointer<MetadataType>)
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{
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return m_metadata;
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}
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void set_metadata(MetadataType metadata)
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requires(!IsNullPointer<MetadataType>)
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{
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m_metadata = move(metadata);
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}
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MetadataType const& metadata_value() const
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requires(!IsNullPointer<MetadataType>)
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{
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return m_metadata.value();
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}
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MetadataType& metadata_value()
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requires(!IsNullPointer<MetadataType>)
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{
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return m_metadata.value();
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}
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ValueType const& value() const { return m_value; }
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ValueType& value() { return m_value; }
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ErrorOr<Trie*> ensure_child(ValueType value, Optional<MetadataType> metadata = {})
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{
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auto it = m_children.find(value);
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if (it == m_children.end()) {
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OwnPtr<Trie> node;
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if constexpr (requires { { value->try_clone() } -> SpecializationOf<ErrorOr>; })
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node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(TRY(value->try_clone()), move(metadata))));
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else
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node = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(value, move(metadata))));
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auto& node_ref = *node;
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TRY(m_children.try_set(move(value), node.release_nonnull()));
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return &static_cast<BaseType&>(node_ref);
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}
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auto& node_ref = *it->value;
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if (metadata.has_value())
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node_ref.m_metadata = move(metadata);
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return &static_cast<BaseType&>(node_ref);
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}
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template<typename It, typename ProvideMetadataFunction>
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ErrorOr<BaseType*> insert(
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It& it, It const& end, MetadataType metadata, ProvideMetadataFunction provide_missing_metadata)
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requires(!IsNullPointer<MetadataType>)
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{
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Trie* last_root_node = &traverse_until_last_accessible_node(it, end);
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auto invoke_provide_missing_metadata = [&]<typename... Ts>(Ts&&... args) -> ErrorOr<Optional<MetadataType>> {
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if constexpr (SameAs<MetadataType, decltype(provide_missing_metadata(forward<Ts>(args)...))>)
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return Optional<MetadataType>(provide_missing_metadata(forward<Ts>(args)...));
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else
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return provide_missing_metadata(forward<Ts>(args)...);
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};
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for (; it != end; ++it) {
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if constexpr (requires { { ValueType::ElementType::try_create(*it) } -> SpecializationOf<ErrorOr>; })
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last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)), TRY(invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it)))));
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else
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last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it, TRY(invoke_provide_missing_metadata(static_cast<BaseType&>(*last_root_node), it)))));
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}
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last_root_node->set_metadata(move(metadata));
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return static_cast<BaseType*>(last_root_node);
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}
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template<typename It>
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ErrorOr<BaseType*> insert(It& it, It const& end)
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requires(IsNullPointer<MetadataType>)
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{
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Trie* last_root_node = &traverse_until_last_accessible_node(it, end);
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for (; it != end; ++it) {
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if constexpr (requires { { ValueType::ElementType::try_create(*it) } -> SpecializationOf<ErrorOr>; })
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last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(TRY(ValueType::ElementType::try_create(*it)), {})));
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else
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last_root_node = static_cast<Trie*>(TRY(last_root_node->ensure_child(*it, {})));
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}
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return static_cast<BaseType*>(last_root_node);
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}
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template<typename It, typename ProvideMetadataFunction>
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ErrorOr<BaseType*> insert(
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It const& begin, It const& end, MetadataType metadata, ProvideMetadataFunction provide_missing_metadata)
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requires(!IsNullPointer<MetadataType>)
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{
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auto it = begin;
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return insert(it, end, move(metadata), move(provide_missing_metadata));
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}
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template<typename It>
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ErrorOr<BaseType*> insert(It const& begin, It const& end)
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requires(IsNullPointer<MetadataType>)
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{
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auto it = begin;
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return insert(it, end);
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}
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HashMap<ValueType, NonnullOwnPtr<Trie>, ValueTraits>& children() { return m_children; }
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HashMap<ValueType, NonnullOwnPtr<Trie>, ValueTraits> const& children() const { return m_children; }
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template<typename Fn>
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ErrorOr<void> for_each_node_in_tree_order(Fn callback) const
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{
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struct State {
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bool did_generate_root { false };
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typename HashMap<ValueType, NonnullOwnPtr<Trie>, ValueTraits>::ConstIteratorType it;
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typename HashMap<ValueType, NonnullOwnPtr<Trie>, ValueTraits>::ConstIteratorType end;
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};
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Vector<State> state;
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TRY(state.try_empend(false, m_children.begin(), m_children.end()));
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auto invoke = [&](auto& current_node) -> ErrorOr<IterationDecision> {
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if constexpr (VoidFunction<Fn, const BaseType&>) {
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callback(static_cast<const BaseType&>(current_node));
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return IterationDecision::Continue;
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} else if constexpr (IsSpecializationOf<decltype(callback(declval<const BaseType&>())), ErrorOr>) {
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return callback(static_cast<const BaseType&>(current_node));
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} else if constexpr (IteratorFunction<Fn, const BaseType&>) {
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return callback(static_cast<const BaseType&>(current_node));
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} else {
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static_assert(DependentFalse<Fn>, "Invalid iterator function type signature");
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}
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return IterationDecision::Continue;
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};
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for (auto* current_node = this; current_node != nullptr;) {
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if (TRY(invoke(*current_node)) == IterationDecision::Break)
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break;
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TRY(skip_to_next_iterator(state, current_node));
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}
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return {};
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}
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[[nodiscard]] bool is_empty() const { return m_children.is_empty(); }
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void clear() { m_children.clear(); }
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ErrorOr<BaseType> deep_copy()
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requires(requires(ValueType value) { { value->try_clone() } -> SpecializationOf<ErrorOr>; })
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{
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Trie root(TRY(m_value->try_clone()), TRY(copy_metadata(m_metadata)));
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for (auto& it : m_children)
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TRY(root.m_children.try_set(TRY(it.key->try_clone()), TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(TRY(it.value->deep_copy()))))));
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return static_cast<BaseType&&>(move(root));
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}
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ErrorOr<BaseType> deep_copy()
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{
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Trie root(m_value, TRY(copy_metadata(m_metadata)));
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for (auto& it : m_children)
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TRY(root.m_children.try_set(it.key, TRY(adopt_nonnull_own_or_enomem(new (nothrow) Trie(TRY(it.value->deep_copy()))))));
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return static_cast<BaseType&&>(move(root));
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}
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private:
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static ErrorOr<Optional<MetadataType>> copy_metadata(Optional<MetadataType> const& metadata)
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{
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if (!metadata.has_value())
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return Optional<MetadataType> {};
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if constexpr (requires(MetadataType t) { { t.copy() } -> SpecializationOf<ErrorOr>; })
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return Optional<MetadataType> { TRY(metadata->copy()) };
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#ifndef KERNEL
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else
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return Optional<MetadataType> { MetadataType(metadata.value()) };
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#endif
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}
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static ErrorOr<void> skip_to_next_iterator(auto& state, auto& current_node)
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{
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auto& current_state = state.last();
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if (current_state.did_generate_root)
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++current_state.it;
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else
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current_state.did_generate_root = true;
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if (current_state.it == current_state.end)
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return pop_and_get_next_iterator(state, current_node);
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current_node = &*(*current_state.it).value;
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TRY(state.try_empend(false, current_node->m_children.begin(), current_node->m_children.end()));
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return {};
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}
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static ErrorOr<void> pop_and_get_next_iterator(auto& state, auto& current_node)
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{
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state.take_last();
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if (state.is_empty()) {
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current_node = nullptr;
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return {};
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}
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return skip_to_next_iterator(state, current_node);
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}
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ValueType m_value;
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Optional<MetadataType> m_metadata;
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HashMap<ValueType, NonnullOwnPtr<Trie>, ValueTraits> m_children;
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};
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template<typename BaseType, typename DefaultBaseType, typename ValueType, typename ValueTraits>
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class Trie<BaseType, DefaultBaseType, ValueType, void, ValueTraits> : public Trie<BaseType, DefaultBaseType, ValueType, decltype(nullptr), ValueTraits> {
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using Trie<BaseType, DefaultBaseType, ValueType, decltype(nullptr), ValueTraits>::Trie;
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};
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}
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template<typename ValueType, typename MetadataT = void, typename ValueTraits = Traits<ValueType>, typename BaseT = void>
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class Trie : public Detail::Trie<BaseT, Trie<ValueType, MetadataT, ValueTraits>, ValueType, MetadataT, ValueTraits> {
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public:
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using DetailTrie = Detail::Trie<BaseT, Trie<ValueType, MetadataT, ValueTraits>, ValueType, MetadataT, ValueTraits>;
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using MetadataType = typename DetailTrie::MetadataType;
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Trie(ValueType value, MetadataType metadata)
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requires(!IsVoid<MetadataType> && !IsNullPointer<MetadataType>)
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: DetailTrie(move(value), move(metadata))
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{
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}
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explicit Trie(ValueType value)
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: DetailTrie(move(value), Optional<MetadataType> {})
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{
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}
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};
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}
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#if USING_AK_GLOBALLY
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using AK::Trie;
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#endif
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