//Remove an item from a given list.
public override object VisitStat_list_remove([NotNull] algoParser.Stat_list_removeContext context)
{
//Get the value that needs to be removed.
AlgoValue toRemove = (AlgoValue)VisitExpr(context.expr());
//Get the variable.
var listVar = Particles.ParseParticleBlock(this, context, context.IDENTIFIER(), context.particle());
if (listVar == null)
{
Error.Fatal(context, "No variable was returned to remove an item from, so can't remove an item from it.");
return(null);
}
//Variable exists, so get the list value from it.
if (listVar.Type != AlgoValueType.List)
{
Error.Fatal(context, "Variable given is not list, so can't remove an item from it.");
return(null);
}
//Get the value of the list.
List <AlgoValue> toSet = (List <AlgoValue>)listVar.Value;
if (context.FROM_SYM() != null)
{
//Remove a given value from the list.
//Check if the list contains the value.
if (!toSet.Any(x => x.Value.Equals(toRemove.Value)))
{
Error.Fatal(context, "The list selected does not contain an item with value given to remove.");
return(null);
}
//Remove the value.
int index = toSet.FindIndex(x => x._Equals(toRemove));
toSet.RemoveAt(index);
}
else
{
//Is the index valid?
if (toRemove.Type != AlgoValueType.Integer)
{
Error.Fatal(context, "The index given to remove at is not an integer.");
return(null);
}
if ((BigInteger)toRemove.Value < 0 || (BigInteger)toRemove.Value > toSet.Count)
{
Error.Fatal(context, "Index to remove out of range for the given list.");
}
//Yes, remove there.
toSet.RemoveAt(int.Parse(((BigInteger)toRemove.Value).ToString()));
}
return(null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_list_remove"/>.
/// <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_list_remove([NotNull] algoParser.Stat_list_removeContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_list_remove"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_list_remove([NotNull] algoParser.Stat_list_removeContext context)
{
}
