//When a variable is modified using a postfix operator.
public override object VisitStat_setvar_postfix([NotNull] algoParser.Stat_setvar_postfixContext context)
{
//Get variable name.
AlgoValue oldValue = Particles.ParseParticleBlock(this, context, context.IDENTIFIER(), context.particle());
if (oldValue == null)
{
Error.Fatal(context, "No value returned to modify with operator.");
return(null);
}
//Switch on the operator type.
int toAdd = 0;
if (context.postfix_op().ADD_PFOP() != null)
{
//Increment.
toAdd = 1;
}
else
{
//Decrement.
toAdd = -1;
}
//Apply the operator.
AlgoValue newValue = null;
switch (oldValue.Type)
{
case AlgoValueType.Integer:
case AlgoValueType.Float:
case AlgoValueType.Rational:
newValue = AlgoOperators.Add(context, oldValue, new AlgoValue()
{
Type = AlgoValueType.Integer,
Value = new BigInteger(toAdd)
});
break;
default:
Error.Fatal(context, "Cannot increment a variable of type " + oldValue.Type.ToString() + ".");
return(null);
}
//Set the variable value.
oldValue.Value = newValue.Value;
oldValue.Type = newValue.Type;
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_setvar_postfix"/>.
/// <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 VisitStat_setvar_postfix([NotNull] algoParser.Stat_setvar_postfixContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_setvar_postfix"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_setvar_postfix([NotNull] algoParser.Stat_setvar_postfixContext context)
{
}
