public override int VisitVariableFactor(EvaluatorParser.VariableFactorContext context)
{
string id = context.ID().GetText();
if (!values.ContainsKey(id))
{
throw new Exception("Unknown id.");
}
bool bFactor = VisitFactor(context.factor()) != 0;
int i = values[id];
if (bFactor)
{
i = Factorial(i);
}
return(i);
}
/// <summary>
/// Visit a parse tree produced by the <c>VariableFactor</c>
/// labeled alternative in <see cref="EvaluatorParser.expr"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitVariableFactor([NotNull] EvaluatorParser.VariableFactorContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>VariableFactor</c>
/// labeled alternative in <see cref="EvaluatorParser.expr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitVariableFactor([NotNull] EvaluatorParser.VariableFactorContext context)
{
}
