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package minijava.symboltable;
public class MExpression extends MType {
public enum Operator {
And, Smaller, Plus, Minus, Times, ArrayLookup,
ArrayLen, MsgSend, Primary;
}
Operator e_op;
public MExpression first, second;
// for msgsend, we need an identifier and a expression list
public MIdentifier e_id;
public MExpressionList e_list;
// Expression type
public MPrimaryExpr e_exp;
// Expression value (for primary expression)
public String e_val;
public MExpression(Operator op) {
e_op = op;
e_exp = new MPrimaryExpr();
e_list = new MExpressionList();
}
public void printExpr(int spaces) {
System.err.print(OutputFormat.spaces(spaces));
switch (e_op) {
case Primary:
e_exp.printPrimExpr(0);
break;
case And:
first.printExpr(0);
System.err.print("&&");
second.printExpr(0);
break;
case Smaller:
first.printExpr(0);
System.err.print("<");
second.printExpr(0);
break;
case Plus:
first.printExpr(0);
System.err.print("+");
second.printExpr(0);
break;
case Minus:
first.printExpr(0);
System.err.print("-");
second.printExpr(0);
break;
case Times:
first.printExpr(0);
System.err.print("*");
second.printExpr(0);
break;
case ArrayLookup:
case ArrayLen:
case MsgSend:
}
}
}
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