76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/Def.h"
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#include "Luau/NotNull.h"
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#include "Luau/Variant.h"
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#include <string>
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#include <optional>
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namespace Luau
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{
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using NullableBreadcrumbId = const struct Breadcrumb*;
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using BreadcrumbId = NotNull<const struct Breadcrumb>;
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struct FieldMetadata
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{
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std::string prop;
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};
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struct SubscriptMetadata
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{
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BreadcrumbId key;
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};
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using Metadata = Variant<FieldMetadata, SubscriptMetadata>;
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struct Breadcrumb
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{
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NullableBreadcrumbId previous;
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DefId def;
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std::optional<Metadata> metadata;
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std::vector<BreadcrumbId> children;
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};
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inline Breadcrumb* asMutable(NullableBreadcrumbId breadcrumb)
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{
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LUAU_ASSERT(breadcrumb);
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return const_cast<Breadcrumb*>(breadcrumb);
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}
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template<typename T>
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const T* getMetadata(NullableBreadcrumbId breadcrumb)
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{
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if (!breadcrumb || !breadcrumb->metadata)
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return nullptr;
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return get_if<T>(&*breadcrumb->metadata);
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}
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struct BreadcrumbArena
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{
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TypedAllocator<Breadcrumb> allocator;
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template<typename... Args>
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BreadcrumbId add(NullableBreadcrumbId previous, DefId def, Args&&... args)
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{
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Breadcrumb* bc = allocator.allocate(Breadcrumb{previous, def, std::forward<Args>(args)...});
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if (previous)
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asMutable(previous)->children.push_back(NotNull{bc});
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return NotNull{bc};
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}
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template<typename T, typename... Args>
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BreadcrumbId emplace(NullableBreadcrumbId previous, DefId def, Args&&... args)
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{
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Breadcrumb* bc = allocator.allocate(Breadcrumb{previous, def, Metadata{T{std::forward<Args>(args)...}}});
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if (previous)
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asMutable(previous)->children.push_back(NotNull{bc});
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return NotNull{bc};
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}
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};
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} // namespace Luau
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