ISAN completo, Prolog

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objeto :- write('{'),aux1, write('}').
aux1 :- read(X),(X='atributo'->atributo;
                 X='fin'->write('')).
atributo :-cadena, write(':'),valor,aux2.
arreglo :- write('['),aux3, 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='sino'->write('else{'),decision,write('}');
                 X='fin'-> write('')).
cadena :- read(X),write('"'),write(X),write('"').
numero :- read(X),write(X).
metodo :- write('"function() {'),instruccion, write('return isan}"').
asignacion :- read(X),write(X),write('='), read(Y),write(Y),write(';').
decision :- write('if ('),read(C),write(C),write(') {'),instruccion,write('}'),aux5.
instruccion :- read(I),(I='asignacion'->asignacion,instruccion;
                 I='decision'->decision,instruccion;
                 I='fin'->write('')).
valor :-read(T),(T='cadena'->cadena;
                 T='numero'->numero;
                 T='arreglo'->arreglo;
                 T='metodo'->metodo;
                 T='objeto'->objeto).
:- objeto.

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