ISAN, Prolog - rextester

ISAN

%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('')),a1,
                               write('}').
a1:- read(X),(X='atributo'->write(','),atributo,a1;
              X='fin'->write('')).
atributo:- cadena, write(':'), valor.
valor:- read(X),(X='numero'->numero;
                  X='cadena'->cadena; 
                  X='objeto'->objeto;
                  X='metodo'->metodo).
cadena:- write('"'),read(X),write(X),write('"').
numero:- read(X),write(X).
metodo:- write('"function() {'),instruccion,write('}"').
instruccion:- read(X), (X='asignacion'->asignacion,instruccion;
                        X='decision'->decision,instruccion;
                        X='finsub'->write('} else {'),asignacion,write(' }');
                        X='finm'->write(' return '),read(Y),write(Y),write(';')).
decision:- write('if ('),numero,write(')'),verdadero.
verdadero:- write('{'),instruccion,write('').
asignacion:- numero,write('='),numero,write('; ').
:- objeto.


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