package cobalt.lang;

import java.util.List;

abstract class Stmt {
    interface Visitor<R> {
        //R visitBlockStmt(Block stmt);
        R visitExpressionStmt(Expression stmt);
        R visitPrintStmt(Print stmt);
        //R visitVarStmt(Var stmt);
    }
    // static class Block extends Stmt {
    //     Block(List<Stmt> statements) {
    //         this.statements = statements;
    //     }

    //     <R> R accept(Visitor<R> visitor) {
    //         return visitor.visitBlockStmt(this);
    //     }

    //     final List<Stmt> statements;
    // }
    static class Expression extends Stmt {
        Expression(Expr expression) {
            this.expression = expression;
        }

        <R> R accept(Visitor<R> visitor) {
            return visitor.visitExpressionStmt(this);
        }

        final Expr expression;
    }
    static class Print extends Stmt {
        Print(Expr expression) {
            this.expression = expression;
        }

        <R> R accept(Visitor<R> visitor) {
            return visitor.visitPrintStmt(this);
        }

        final Expr expression;
    }
    // static class Var extends Stmt {
    //     Var(Token name, Expr initializer) {
    //         this.name = name;
    //         this.initializer = initializer;
    //     }

    //     <R> R accept(Visitor<R> visitor) {
    //         return visitor.visitVarStmt(this);
    //     }

    //     final Token name;
    //     final Expr initializer;
    // }

    abstract <R> R accept(Visitor<R> visitor);
}