ExpMenos.java

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package plp.expressions2.expression;

import plp.expressions1.util.Tipo;
import plp.expressions2.memory.AmbienteCompilacao;
import plp.expressions2.memory.AmbienteExecucao;
import plp.expressions2.memory.VariavelJaDeclaradaException;
import plp.expressions2.memory.VariavelNaoDeclaradaException;

public class ExpMenos extends ExpUnaria {

        public ExpMenos(Expressao exp){
                super(exp, "-");
        }

        public Valor avaliar(AmbienteExecucao amb) throws VariavelJaDeclaradaException, 
                        VariavelNaoDeclaradaException {
                return new ValorInteiro(- ((ValorInteiro)getExp().avaliar(amb)).valor());
        }

        protected boolean checaTipoElementoTerminal(AmbienteCompilacao amb) throws VariavelJaDeclaradaException, 
                        VariavelNaoDeclaradaException {
                return (getExp().getTipo(amb).eInteiro());
        }

        public Tipo getTipo(AmbienteCompilacao amb) {
                return Tipo.TIPO_INTEIRO;
        }
}

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