Tarea 2, Prolog - rextester

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objeto:- write('{'),read(X), (X='atributo'->atributo),write('}').
a1:- read(X),(X='atributo'-> write(','),atributo;(X='fin'->write(''))).
atributo:- read(X), write('"'), write(X), write('":'),tipoatributo(X),a1. 
tipoatributo(M):- read(X), (X='metodo'->metodo(M);(X='numero'->numero); (X='cadena'->cadena);(X='objeto'->objeto);(X='arreglo'->arreglo);write('error') ).
arreglo:- write('['), elemento.
b1:- read(X),(X='elemento'->write(','),elemento;(X='fin'->write(']'))).
elemento:- read(X),((X='metodo'->metodo(M));(X='numero'->numero);(X='cadena'->cadena);(X='objeto'->objeto);(X='arreglo'->arreglo)),b1.
cadena:- read(X), write('"'), write(X), write('"').
numero:- read(X), write(X).
metodo(M):- write('"function() {'),a2,write(' return '), write(M), write(';}"').
a2:- read(X),(X='decision'-> decision;(X='asignacion'->asignacion);(a4(X))). 
a4(X):- X='fin' -> write('');(write('ER: '),write(X)).
asignacion:- read(X), write(X), write('='), read(Y), write(Y), write(';'),a2.
decision:- write('if('),condicion,write(')'), verdadero, falso.
condicion:-read(X), write(X).
verdadero:- write('{'),a2,write('}').
falso:- write('else {'),a2,write('}').
:-objeto.

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