package ast

import "golox/token"

type ExprVisitor[T any] interface {
	VisitErrorExpr(ee *ErrorExpr) T
	VisitBinaryExpr(be *BinaryExpr) T
	VisitGroupingExpr(ge *GroupingExpr) T
	VisitLiteralExpr(le *LiteralExpr) T
	VisitUnaryExpr(ue *UnaryExpr) T
	VisitVariableExpr(ve *VariableExpr) T
}

type Expr interface {
	Accept(visitor ExprVisitor[any]) any
}

type ErrorExpr struct {
	Value string
}

func (ee *ErrorExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitErrorExpr(ee)
}

type BinaryExpr struct {
	Left Expr
	Operator token.Token
	Right Expr
}

func (be *BinaryExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitBinaryExpr(be)
}

type GroupingExpr struct {
	Expression Expr
}

func (ge *GroupingExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitGroupingExpr(ge)
}

type LiteralExpr struct {
	Value any
}

func (le *LiteralExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitLiteralExpr(le)
}

type UnaryExpr struct {
	Operator token.Token
	Right Expr
}

func (ue *UnaryExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitUnaryExpr(ue)
}

type VariableExpr struct {
	Name token.Token
}

func (ve *VariableExpr) Accept(v ExprVisitor[any]) any {
	return v.VisitVariableExpr(ve)
}