isan, Prolog - rextester

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%commands to the interpreter are submitted from stdin input ('show input' box below)
%'halt.' will be automatically appended to stdin input.
%swi-prolog 7.6.4

objeto :- write('{'),read(X),(X='atributo'->atributo;write('')),write('}').
atributo :-cadena,write(':'),valor,otro.
valor :- read(X),(X='cadena'->cadena;X='numero'->numero;X='objeto'->objeto;X='vacio'->write('""');X='vacioa'->write('');X='arreglo'->array;X='boolean'->numero;X='null'->write('null');X='objeto'->objeto;X='metodo'->metodo).
array :- write('['),valor,arrayitem,write(']').
arrayitem :- read(X),(X='otro'->item;write('')).
item :- write(','),valor,arrayitem.
numero :- read(X),write(X).
cadena :- read(X),write('"'),write(X),write('"').
otro :- read(X),(X='otro'->write(','),atributo,otro;write('')).
metodo :- write('"function(){'),instruccion,write('}"').
instruccion :- read(X),(X='asignacion'->asignacion,instruccion;X='decision'->decision,instruccion;X='finsub'->write('');X='falso'->falso,instruccion;X='false'->falsocon,instruccion;X='finm'->write(' return '),read(Y),write(Y),write(';')).
decision :- write('if ('),numero,write(')'),verdadero.
verdadero :- write('{'),instruccion,write('}').
falso :- write('else{'),instruccion,write('}').
falsocon :- write('else if('),numero,write(')'),verdadero.
asignacion :- numero,write('='),numero,write('; ').
:- objeto.

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