package ast

import "git.red-panda.pet/pandaware/lox-go/lexer"

// todo: find something better than any here
// we can't use generics on either the visitor itself or
// each individual method because the adding it to the
// visitor itself infects every expr you use with it
// and methods cannot have generic parameters

type ExprVisitor interface {
	VisitBinaryExpr(b *BinaryExpr) any
	VisitGroupingExpr(g *GroupingExpr) any
	VisitLiteralExpr(g *LiteralExpr) any
	VisitUnaryExpr(g *UnaryExpr) any
}

type Expr interface {
	Accept(v ExprVisitor) any
}

type BinaryExpr struct {
	Left     Expr
	Operator *lexer.Token
	Right    Expr
}

func (b *BinaryExpr) Accept(v ExprVisitor) any {
	return v.VisitBinaryExpr(b)
}

type GroupingExpr struct {
	Expr Expr
}

func (g *GroupingExpr) Accept(v ExprVisitor) any {
	return v.VisitGroupingExpr(g)
}

type LiteralExpr struct {
	Value any
}

func (l *LiteralExpr) Accept(v ExprVisitor) any {
	return v.VisitLiteralExpr(l)
}

type UnaryExpr struct {
	Operator *lexer.Token
	Right    Expr
}

func (u *UnaryExpr) Accept(v ExprVisitor) any {
	return v.VisitUnaryExpr(u)
}