CSCI-258-Labs/344/arro/Java/Exp.java

//Exp:top//
//Exp:import//
import java.util.*;

// <exp> ::= <mult> <exprest>
public class Exp /*Exp:class*/ {

    public static final String $className = "Exp";
    public static final String $ruleString =
        "<exp> ::= <mult> <exprest>";

    public Mult mult;
    public Exprest exprest;

    public Exp(Mult mult, Exprest exprest) {
//Exp:init//
        this.mult = mult;
        this.exprest = exprest;
    }

    public static Exp parse(Scan scn$, Trace trace$) {
        if (trace$ != null)
            trace$ = trace$.nonterm("<exp>", scn$.lno);
        Mult mult = Mult.parse(scn$, trace$);
        Exprest exprest = Exprest.parse(scn$, trace$);
        return new Exp(mult, exprest);
    }

    public int eval() {
      int v = mult.eval();
      for (int i = 0; i < exprest.opList.size(); i++)
        v += exprest.opList.get(i).toString().equals("+")
             ? exprest.multList.get(i).eval()
             : -exprest.multList.get(i).eval();
      return v;
    }

//Exp//
}