//When a single term is parsed in Algo.
public override object VisitTerm([NotNull] algoParser.TermContext context)
{
//Is it a multiplication?
if (context.MUL_OP() != null)
{
//Multiplication.
//Evaluate the left side (term).
AlgoValue left = (AlgoValue)VisitTerm(context.term());
//Evaluate the right side.
AlgoValue right = (AlgoValue)VisitFactor(context.factor());
//Perform multiplication.
return(AlgoOperators.Mul(context, left, right));
}
else if (context.DIV_OP() != null)
{
//Division.
//Evaluate the left side (term).
AlgoValue left = (AlgoValue)VisitTerm(context.term());
//Evaluate the right side.
AlgoValue right = (AlgoValue)VisitFactor(context.factor());
//Perform division.
return(AlgoOperators.Div(context, left, right));
}
else if (context.MOD_OP() != null)
{
//Modulus.
AlgoValue left = (AlgoValue)VisitTerm(context.term());
AlgoValue right = (AlgoValue)VisitFactor(context.factor());
//Perform modulus.
return(AlgoOperators.Mod(context, left, right));
}
else
{
//No, just a factor, evaluate.
return((AlgoValue)VisitFactor(context.factor()));
}
//Error.
throw new Exception("Invalid expression type.");
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.term"/>.
/// <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 VisitTerm([NotNull] algoParser.TermContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.term"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitTerm([NotNull] algoParser.TermContext context)
{
}
