Atribuicao.java

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package plp.imperative1.command;

import plp.expressions2.expression.Expressao;
import plp.expressions2.expression.Id;
import plp.expressions2.memory.VariavelNaoDeclaradaException;
import plp.expressions2.memory.VariavelJaDeclaradaException;
import plp.imperative1.memory.AmbienteExecucaoImperativa;
import plp.imperative1.memory.AmbienteCompilacaoImperativa;

public class Atribuicao implements Comando {

    private Id id;
    
    private Expressao expressao;
    
    public Atribuicao(Id id, Expressao expressao){
        this.id = id;
        this.expressao = expressao;
    }
    
    public AmbienteExecucaoImperativa executar(AmbienteExecucaoImperativa ambiente) 
                throws VariavelJaDeclaradaException, VariavelNaoDeclaradaException {
        ambiente.changeValor(id, expressao.avaliar(ambiente));
        return ambiente;
    }

    public boolean checaTipo(AmbienteCompilacaoImperativa ambiente) 
        throws VariavelNaoDeclaradaException, VariavelJaDeclaradaException{
        return expressao.checaTipo(ambiente) &&
               id.getTipo(ambiente).equals(expressao.getTipo(ambiente));
    }

}

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