2 - codificador JSON If anidados y else, Prolog

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objeto :- write('{'),aux1, write('}').

atributo :-cadena, write(':'),valor,aux2.

aux1 :- read(X),(X='atributo'->atributo;
                X='fin'->write('')).
                
aux2 :- read(X),(X='atributo'->write(','),atributo;
                 X='fin'->write('')).

aux3 :- read(X),(X='valor'->valor,aux4;
                 X='fin'->write('')).

aux4 :- read(X),(X='valor'->write(','),valor,aux4;
                 X='fin'->write('')).  
                 
aux5 :- read(X), (X='return' -> return;
                    X='fin'->write('')).              
                 
cadena :- read(X),write('"'),write(X),write('"').

numero :- read(X),write(X).

booleano :- read(X),write(X).

arreglo :- write('['), aux3, write(']').

metodo :- write('"function () {'),instruccion, write('}"').

instruccion :- read(X),(X='asignacion'->asignacion,instruccion;
                        X='decision'-> decision , instruccion;
                        X='else' ->else ,instruccion;
                        X='elseif' ->elseif ,instruccion;
                        X='return'->return , instruccion;
                        X='fin'->write('')). 
finMetodo :- write(' }"').

asignacion :-  read(X) , write(X), write('=') , read(Y) , write(Y) ,write(';').

decision :- write('if (') , read(X) , write(X) , write(') {') , instruccion , write('}').

else :- write('else') , write('{') , instruccion , write('}').

elseif :- write('else if (') , read(X) , write(X) , write(') {') , instruccion , write('}').

return :- read(X), write('return '), write(X).

valor :-read(T),(T='cadena'->cadena;
                 T='numero'->numero;
                 T= 'booleano' -> booleano;
                 T='arreglo'->arreglo;
                 T='metodo'->metodo;
                 T='objeto'->objeto).
:- objeto.

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Absolute running time: 0.31 sec, cpu time: 0.16 sec, memory peak: 7 Mb, absolute service time: 0,37 sec