//When a single factor is parsed in Algo.
public override object VisitFactor([NotNull] algoParser.FactorContext context)
{
//Is there a power?
if (context.POW_OP() != null)
{
//Yes.
//Evaluate left factor.
AlgoValue left = (AlgoValue)VisitFactor(context.factor());
//Evaluate right sub.
AlgoValue right = (AlgoValue)VisitSub(context.sub());
//Perform a power.
return(AlgoOperators.Pow(context, left, right));
}
else
{
//No, just evaluate the sub.
return((AlgoValue)VisitSub(context.sub()));
}
//Error.
throw new Exception("Invalid expression type.");
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.factor"/>.
/// <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 VisitFactor([NotNull] algoParser.FactorContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.factor"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitFactor([NotNull] algoParser.FactorContext context)
{
}