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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* include/synext_decorator.hpp
* - Decorator syntax extensions (#[foo])
*/
#pragma once
#ifndef _SYNEXT_DECORATOR_HPP_
#define _SYNEXT_DECORATOR_HPP_
#include <string>
#include <memory>
#include <span.hpp>
#include <slice.hpp>
#include "../ast/item.hpp"
#include "../ast/expr.hpp"
class TypeRef;
namespace AST {
class Crate;
class Attribute;
class Path;
struct StructItem;
struct TupleItem;
struct EnumVariant;
class Module;
class Item;
class Expr;
class ExprNode;
struct ExprNode_Match_Arm;
class ImplDef;
}
enum class AttrStage
{
Pre,
Post,
};
class ExpandDecorator
{
void unexpected(const Span& sp, const AST::Attribute& mi, const char* loc_str) const;
public:
virtual AttrStage stage() const = 0;
virtual void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate) const { unexpected(sp, mi, "crate"); }
virtual void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, const AST::Path& path, AST::Module& mod, slice<const AST::Attribute> attrs, AST::Item&i) const { unexpected(sp, mi, "item"); }
// NOTE: To delete, set the type to `_`
virtual void handle(const Span& sp, const AST::Attribute& 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::Attribute& 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::Attribute& 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::Attribute& mi, AST::Crate& crate, ::AST::EnumVariant& ev) const { unexpected(sp, mi, "enum variant"); }
virtual void handle(const Span& sp, const AST::Attribute& 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::Attribute& mi, AST::Crate& crate, ::AST::ExprNode_Match_Arm& expr) const { unexpected(sp, mi, "match arm"); }
// NOTE: To delete, clear the value
virtual void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::ExprNode_StructLiteral::Ent& expr) const { unexpected(sp, mi, "struct literal ent"); }
};
struct DecoratorDef;
extern void Register_Synext_Decorator(::std::string name, ::std::unique_ptr<ExpandDecorator> handler);
extern void Register_Synext_Decorator_Static(DecoratorDef* def);
struct DecoratorDef
{
DecoratorDef* prev;
::std::string name;
::std::unique_ptr<ExpandDecorator> def;
DecoratorDef(::std::string name, ::std::unique_ptr<ExpandDecorator> def):
prev(nullptr),
name(::std::move(name)),
def(::std::move(def))
{
Register_Synext_Decorator_Static(this);
}
};
#define STATIC_DECORATOR(ident, _handler_class) static DecoratorDef s_register_##_handler_class ( ident, ::std::unique_ptr<ExpandDecorator>(new _handler_class()) );
#endif
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