53 lines
2.0 KiB
C++
53 lines
2.0 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/Error.h"
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#include "Luau/Location.h"
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#include "Luau/Type.h"
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#include "Luau/TypePack.h"
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#include <memory>
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#include <optional>
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namespace Luau
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{
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struct TxnLog;
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struct TypeArena;
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using ScopePtr = std::shared_ptr<struct Scope>;
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std::optional<TypeId> findMetatableEntry(
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NotNull<BuiltinTypes> builtinTypes, ErrorVec& errors, TypeId type, const std::string& entry, Location location);
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std::optional<TypeId> findTablePropertyRespectingMeta(
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NotNull<BuiltinTypes> builtinTypes, ErrorVec& errors, TypeId ty, const std::string& name, Location location);
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// Returns the minimum and maximum number of types the argument list can accept.
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std::pair<size_t, std::optional<size_t>> getParameterExtents(const TxnLog* log, TypePackId tp, bool includeHiddenVariadics = false);
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// Extend the provided pack to at least `length` types.
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// Returns a temporary TypePack that contains those types plus a tail.
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TypePack extendTypePack(
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TypeArena& arena, NotNull<BuiltinTypes> builtinTypes, TypePackId pack, size_t length, std::vector<std::optional<TypeId>> overrides = {});
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/**
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* Reduces a union by decomposing to the any/error type if it appears in the
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* type list, and by merging child unions. Also strips out duplicate (by pointer
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* identity) types.
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* @param types the input type list to reduce.
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* @returns the reduced type list.
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*/
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std::vector<TypeId> reduceUnion(const std::vector<TypeId>& types);
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/**
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* Tries to remove nil from a union type, if there's another option. T | nil
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* reduces to T, but nil itself does not reduce.
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* @param builtinTypes the singleton types to use
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* @param arena the type arena to allocate the new type in, if necessary
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* @param ty the type to remove nil from
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* @returns a type with nil removed, or nil itself if that were the only option.
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*/
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TypeId stripNil(NotNull<BuiltinTypes> builtinTypes, TypeArena& arena, TypeId ty);
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} // namespace Luau
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