private VariableExpresionNode Variable()
{
List <int> c;
if (this.lookahead.token == Token.VARIABLE)
{
String nombreVariable = this.lookahead.sequence;
NextToken();
if (this.lookahead != null && this.lookahead.token == Token.ASIGNACION)
{
NextToken();
ExpresionNode exp = Expresion();
c = exp.GetConjunto();
this.variables.Add(nombreVariable, c);
}
else
{
c = variables[nombreVariable];
if (c == null)
{
throw new Exception("Variable no definida");
}
}
return(new VariableExpresionNode(c));
}
return(null);
}
private ExpresionNode Expresion()
{
ExpresionNode node = Conjunto();
if (node != null)
{
return(node);
}
node = Variable();
if (node != null)
{
return(node);
}
node = Creacion();
if (node != null)
{
return(node);
}
node = Mostrar();
if (node != null)
{
return(node);
}
node = Maximo();
if (node != null)
{
return(node);
}
node = Minimo();
if (node != null)
{
return(node);
}
node = Media();
if (node != null)
{
return(node);
}
node = Extraer();
if (node != null)
{
return(node);
}
return(null);
}
private void Parse(List <Token> tokens)
{
//Para hacer una copia de la lista
this.tokens = new LinkedList <Token>();
foreach (var item in tokens)
{
this.tokens.AddLast(item);
}
NextToken();
while (this.lookahead != null)
{
ExpresionNode e = Expresion();
}
}
