108 lines
2.3 KiB
C++
108 lines
2.3 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/Ast.h"
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#include "Luau/Common.h"
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#include <string>
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LUAU_FASTFLAG(DebugLuauDeferredConstraintResolution)
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namespace Luau
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{
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struct Symbol
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{
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Symbol()
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: local(nullptr)
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, global()
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{
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}
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Symbol(AstLocal* local)
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: local(local)
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, global()
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{
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}
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Symbol(const AstName& global)
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: local(nullptr)
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, global(global)
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{
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}
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template<typename T>
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Symbol(const T&) = delete;
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AstLocal* local;
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AstName global;
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explicit operator bool() const
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{
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return local != nullptr || global.value != nullptr;
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}
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bool operator==(const Symbol& rhs) const
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{
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if (local)
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return local == rhs.local;
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else if (global.value)
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return rhs.global.value && global == rhs.global.value; // Subtlety: AstName::operator==(const char*) uses strcmp, not pointer identity.
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else if (FFlag::DebugLuauDeferredConstraintResolution)
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return !rhs.local && !rhs.global.value; // Reflexivity: we already know `this` Symbol is empty, so check that rhs is.
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else
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return false;
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}
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bool operator!=(const Symbol& rhs) const
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{
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return !(*this == rhs);
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}
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bool operator<(const Symbol& rhs) const
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{
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if (local && rhs.local)
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return local < rhs.local;
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else if (global.value && rhs.global.value)
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return global < rhs.global;
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else if (local)
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return true;
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return false;
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}
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AstName astName() const
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{
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if (local)
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return local->name;
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LUAU_ASSERT(global.value);
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return global;
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}
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const char* c_str() const
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{
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if (local)
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return local->name.value;
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LUAU_ASSERT(global.value);
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return global.value;
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}
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};
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std::string toString(const Symbol& name);
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} // namespace Luau
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namespace std
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{
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template<>
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struct hash<Luau::Symbol>
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{
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std::size_t operator()(const Luau::Symbol& s) const noexcept
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{
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return std::hash<const Luau::AstLocal*>()(s.local) ^ (s.global.value ? std::hash<std::string_view>()(s.global.value) : 0);
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}
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};
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} // namespace std
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