Neg.java

package nodeAST.sign;

import java.util.Map;

import nodeAST.Expression;
import nodeAST.Ident;
import nodeAST.UnaryExpr;
import nodeAST.literals.Literal;


import types.Type;
import visitor.ASTVisitor;
import visitor.IdentifiersTypeMatcher;

public class Neg extends UnaryExpr {

	public Neg(Expression expr) {
		super(expr);
	}

	@Override
	public void accept(ASTVisitor visitor) {
		visitor.visit(this, this.operand);
	}

	@Override
	public String toString() {
		return "-" + this.operand.toString(); 
	}

	@Override
	public Type getType(IdentifiersTypeMatcher typeMatcher) {
		//the type of neg is the type of its operand
		return this.operand.getType(typeMatcher);
	}

	@Override
	public boolean areOperandsTypeValid(IdentifiersTypeMatcher typeMatcher) {
		Type t1=this.operand.getType(typeMatcher);
		return t1.isArithmetic();
	}

	@Override
	public Literal compute(Map<Ident, Expression> identifiers) {
		return this.operand.compute(identifiers).neg();
	}
}