luau/Analysis/include/Luau/ToString.h

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#pragma once
#include "Luau/Common.h"
#include "Luau/TypeVar.h"
#include <unordered_map>
#include <optional>
#include <memory>
#include <string>
LUAU_FASTINT(LuauTableTypeMaximumStringifierLength)
LUAU_FASTINT(LuauTypeMaximumStringifierLength)
namespace Luau
{
struct ToStringNameMap
{
std::unordered_map<TypeId, std::string> typeVars;
std::unordered_map<TypePackId, std::string> typePacks;
};
struct ToStringOptions
{
bool exhaustive = false; // If true, we produce complete output rather than comprehensible output
bool useLineBreaks = false; // If true, we insert new lines to separate long results such as table entries/metatable.
bool functionTypeArguments = false; // If true, output function type argument names when they are available
bool hideTableKind = false; // If true, all tables will be surrounded with plain '{}'
bool hideNamedFunctionTypeParameters = false; // If true, type parameters of functions will be hidden at top-level.
bool hideFunctionSelfArgument = false; // If true, `self: X` will be omitted from the function signature if the function has self
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bool indent = false;
size_t maxTableLength = size_t(FInt::LuauTableTypeMaximumStringifierLength); // Only applied to TableTypeVars
size_t maxTypeLength = size_t(FInt::LuauTypeMaximumStringifierLength);
std::optional<ToStringNameMap> nameMap;
std::shared_ptr<Scope> scope; // If present, module names will be added and types that are not available in scope will be marked as 'invalid'
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std::vector<std::string> namedFunctionOverrideArgNames; // If present, named function argument names will be overridden
};
struct ToStringResult
{
std::string name;
ToStringNameMap nameMap;
bool invalid = false;
bool error = false;
bool cycle = false;
bool truncated = false;
};
ToStringResult toStringDetailed(TypeId ty, const ToStringOptions& opts = {});
ToStringResult toStringDetailed(TypePackId ty, const ToStringOptions& opts = {});
std::string toString(TypeId ty, const ToStringOptions& opts);
std::string toString(TypePackId ty, const ToStringOptions& opts);
// These are offered as overloads rather than a default parameter so that they can be easily invoked from within the MSVC debugger.
// You can use them in watch expressions!
inline std::string toString(TypeId ty)
{
return toString(ty, ToStringOptions{});
}
inline std::string toString(TypePackId ty)
{
return toString(ty, ToStringOptions{});
}
std::string toString(const TypeVar& tv, const ToStringOptions& opts = {});
std::string toString(const TypePackVar& tp, const ToStringOptions& opts = {});
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std::string toStringNamedFunction(const std::string& funcName, const FunctionTypeVar& ftv, const ToStringOptions& opts = {});
// It could be useful to see the text representation of a type during a debugging session instead of exploring the content of the class
// These functions will dump the type to stdout and can be evaluated in Watch/Immediate windows or as gdb/lldb expression
std::string dump(TypeId ty);
std::string dump(TypePackId ty);
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std::string dump(const std::shared_ptr<Scope>& scope, const char* name);
std::string generateName(size_t n);
} // namespace Luau