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87 lines
3.1 KiB
C++
87 lines
3.1 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/Location.h"
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#include "Luau/NotNull.h"
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#include "Luau/Type.h"
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#include <unordered_map>
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#include <optional>
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#include <memory>
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namespace Luau
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{
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struct Scope;
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using ScopePtr = std::shared_ptr<Scope>;
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struct Binding
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{
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TypeId typeId;
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Location location;
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bool deprecated = false;
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std::string deprecatedSuggestion;
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std::optional<std::string> documentationSymbol;
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};
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struct Scope
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{
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explicit Scope(TypePackId returnType); // root scope
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explicit Scope(const ScopePtr& parent, int subLevel = 0); // child scope. Parent must not be nullptr.
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const ScopePtr parent; // null for the root
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// All the children of this scope.
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std::vector<NotNull<Scope>> children;
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std::unordered_map<Symbol, Binding> bindings;
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TypePackId returnType;
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std::optional<TypePackId> varargPack;
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TypeLevel level;
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std::unordered_map<Name, TypeFun> exportedTypeBindings;
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std::unordered_map<Name, TypeFun> privateTypeBindings;
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std::unordered_map<Name, Location> typeAliasLocations;
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std::unordered_map<Name, Location> typeAliasNameLocations;
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std::unordered_map<Name, ModuleName> importedModules; // Mapping from the name in the require statement to the internal moduleName.
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std::unordered_map<Name, std::unordered_map<Name, TypeFun>> importedTypeBindings;
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DenseHashSet<Name> builtinTypeNames{""};
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void addBuiltinTypeBinding(const Name& name, const TypeFun& tyFun);
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std::optional<TypeId> lookup(Symbol sym) const;
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std::optional<TypeId> lookup(DefId def) const;
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std::optional<std::pair<TypeId, Scope*>> lookupEx(Symbol sym);
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std::optional<TypeFun> lookupType(const Name& name);
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std::optional<TypeFun> lookupImportedType(const Name& moduleAlias, const Name& name);
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std::unordered_map<Name, TypePackId> privateTypePackBindings;
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std::optional<TypePackId> lookupPack(const Name& name);
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// WARNING: This function linearly scans for a string key of equal value! It is thus O(n**2)
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std::optional<Binding> linearSearchForBinding(const std::string& name, bool traverseScopeChain = true) const;
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RefinementMap refinements;
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DenseHashMap<const Def*, TypeId> dcrRefinements{nullptr};
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// For mutually recursive type aliases, it's important that
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// they use the same types for the same names.
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// For instance, in `type Tree<T> { data: T, children: Forest<T> } type Forest<T> = {Tree<T>}`
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// we need that the generic type `T` in both cases is the same, so we use a cache.
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std::unordered_map<Name, TypeId> typeAliasTypeParameters;
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std::unordered_map<Name, TypePackId> typeAliasTypePackParameters;
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};
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// Returns true iff the left scope encloses the right scope. A Scope* equal to
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// nullptr is considered to be the outermost-possible scope.
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bool subsumesStrict(Scope* left, Scope* right);
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// Returns true if the left scope encloses the right scope, or if they are the
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// same scope. As in subsumesStrict(), nullptr is considered to be the
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// outermost-possible scope.
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bool subsumes(Scope* left, Scope* right);
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} // namespace Luau
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