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/*
*/
#pragma once
#ifndef _SYNEXT_HPP_
#define _SYNEXT_HPP_
#include "../ast/item.hpp"
#include <span.hpp>
class TypeRef;
namespace AST {
class Crate;
class MetaItem;
class Path;
class StructItem;
class TupleItem;
class EnumVariant;
class Module;
class Item;
class Expr;
class ExprNode;
class ExprNode_Match_Arm;
class MacroInvocation;
class ImplDef;
}
class TokenTree;
class TokenStream;
#include "../common.hpp" // for mv$ and other things
#include <string>
#include <memory>
enum class AttrStage
{
EarlyPre,
EarlyPost,
LatePre,
LatePost,
};
class ExpandDecorator
{
void unexpected(const Span& sp, const AST::MetaItem& mi, const char* loc_str) const;
public:
virtual AttrStage stage() const = 0;
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate) const { unexpected(sp, mi, "crate"); }
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, AST::MacroInvocation& mac) const { unexpected(sp, mi, "macro invocation"); }
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item&i) const { unexpected(sp, mi, "item"); }
// NOTE: To delete, set the type to `_`
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, const AST::Module& mod, AST::ImplDef& impl) const { unexpected(sp, mi, "impl"); }
// NOTE: To delete, clear the name
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, ::AST::StructItem& si) const { unexpected(sp, mi, "struct item"); }
// NOTE: To delete, make the type invalid
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, ::AST::TupleItem& si) const { unexpected(sp, mi, "tuple item"); }
// NOTE: To delete, clear the name
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, ::AST::EnumVariant& ev) const { unexpected(sp, mi, "enum variant"); }
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, ::std::unique_ptr<AST::ExprNode>& expr) const { unexpected(sp, mi, "expression"); }
// NOTE: To delete, clear the patterns vector
virtual void handle(const Span& sp, const AST::MetaItem& mi, AST::Crate& crate, ::AST::ExprNode_Match_Arm& expr) const { unexpected(sp, mi, "match arm"); }
};
class ExpandProcMacro
{
public:
virtual bool expand_early() const = 0;
virtual ::std::unique_ptr<TokenStream> expand(const Span& sp, const AST::Crate& crate, const ::std::string& ident, const TokenTree& tt, AST::Module& mod) = 0;
};
#define STATIC_DECORATOR(ident, _handler_class) \
struct register_##_handler_class##_c {\
register_##_handler_class##_c() {\
Register_Synext_Decorator( ident, ::std::unique_ptr<ExpandDecorator>(new _handler_class()) ); \
} \
} s_register_##_handler_class;
#define STATIC_MACRO(ident, _handler_class) \
struct register_##_handler_class##_c {\
register_##_handler_class##_c() {\
Register_Synext_Macro( ident, ::std::unique_ptr<ExpandProcMacro>(new _handler_class()) ); \
} \
} s_register_##_handler_class;
extern void Register_Synext_Decorator(::std::string name, ::std::unique_ptr<ExpandDecorator> handler);
extern void Register_Synext_Macro(::std::string name, ::std::unique_ptr<ExpandProcMacro> handler);
extern void Expand_Expr(bool is_early, ::AST::Crate& crate, LList<const AST::Module*> modstack, ::std::unique_ptr<AST::ExprNode>& node);
#endif
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