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95 lines
3 KiB
C++
95 lines
3 KiB
C++
/*
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* Copyright (c) 2023, Andrew Kaster <akaster@serenityos.org>
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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/ByteBuffer.h>
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#include <AK/Error.h>
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#include <AK/MemoryStream.h>
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#include <AK/RefPtr.h>
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#include <AK/Span.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Variant.h>
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#include <LibCore/File.h>
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#include <LibCore/MappedFile.h>
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namespace Core {
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class Resource : public RefCounted<Resource> {
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public:
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static ErrorOr<NonnullRefPtr<Resource>> load_from_filesystem(StringView);
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static ErrorOr<NonnullRefPtr<Resource>> load_from_uri(StringView);
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[[nodiscard]] bool is_file() const { return !m_data.has<DirectoryTag>(); }
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[[nodiscard]] bool is_directory() const { return m_data.has<DirectoryTag>(); }
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[[nodiscard]] String uri() const;
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[[nodiscard]] String filename() const;
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[[nodiscard]] String filesystem_path() const;
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[[nodiscard]] String file_url() const;
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[[nodiscard]] Optional<time_t> modified_time() const;
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[[nodiscard]] ByteBuffer clone_data() const;
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[[nodiscard]] ByteBuffer release_data() &&;
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[[nodiscard]] ReadonlyBytes data() const;
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[[nodiscard]] FixedMemoryStream stream() const;
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[[nodiscard]] Vector<String> children() const;
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// Depth-first
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template<IteratorFunction<Resource const&> Callback>
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IterationDecision for_each_descendant(Callback&&) const;
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template<IteratorFunction<Resource const&> Callback>
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void for_each_descendant_file(Callback&&) const;
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struct DirectoryTag { };
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private:
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friend class ResourceImplementation;
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enum class Scheme {
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File,
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Resource,
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};
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Resource(String path, Scheme, NonnullOwnPtr<Core::MappedFile>, time_t modified_time);
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Resource(String path, Scheme, ByteBuffer, time_t modified_time);
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Resource(String path, Scheme, DirectoryTag, time_t modified_time);
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String m_path; // Relative to scheme root. File: abspath, Resource: resource root
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Scheme m_scheme;
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Variant<DirectoryTag, NonnullOwnPtr<Core::MappedFile>, ByteBuffer> m_data;
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time_t m_modified_time {};
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};
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template<IteratorFunction<Resource const&> Callback>
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IterationDecision Resource::for_each_descendant(Callback&& callback) const
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{
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auto children = this->children();
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for (auto const& child : children) {
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if (auto child_resource = load_from_uri(MUST(String::formatted("{}/{}", uri(), child))); !child_resource.is_error()) {
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if (callback(*child_resource.value()) == IterationDecision::Break)
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return IterationDecision::Break;
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if (child_resource.value()->for_each_descendant(callback) == IterationDecision::Break)
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return IterationDecision::Break;
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}
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}
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return IterationDecision::Continue;
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}
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template<IteratorFunction<Resource const&> Callback>
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void Resource::for_each_descendant_file(Callback&& callback) const
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{
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for_each_descendant([callback = forward<Callback>(callback)](Resource const& resource) {
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if (resource.is_directory())
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return IterationDecision::Continue;
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return callback(resource);
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});
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}
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}
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