public override void Parse(ParsingContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
Children.Clear();
int from = context.GetIntValue(From);
int to = context.GetIntValue(To);
int step = context.GetIntValue(Step);
if (step == 0)
{
throw new ParserException("Invalid Loop: step cannot be 0", this);
}
if (step > 0 && to < from)
{
throw new ParserException("Invalid loop", this);
}
if (step < 0 && to > from)
{
throw new ParserException("Invalid loop", this);
}
int index = from;
while (index * step <= to * step)
{
var gp = new GroupResult(index.ToString(CultureInfo.InvariantCulture));
Children.Add(gp);
gp.Children.AddRange(Template.Clone());
index = index + step;
}
}
private void BuildResultTreeNodes(ParsingResultNodeList prnl, FieldCollectionBase confItems)
{
foreach (FieldElementBase item in confItems)
{
if (item is ConstantElement)
{
var element = (ConstantElement)item;
prnl.Add(new ConstantResult(element));
}
else if (item is SwitchElement) // as switch is of field type, it must be checked before
{
var element = (SwitchElement)item;
var sw = new SwitchResult(element);
prnl.Add(sw);
foreach (GroupElement c in element.Cases)
{
if (c is CaseElement)
{
var caseE = (CaseElement)c;
var gp = new GroupResult(caseE.Label);
sw.Cases.Add(caseE.When, gp);
BuildResultTreeNodes(gp.Children, caseE.Fields);
}
else if (c is ElseElement)
{
if (sw.Else != null)
{
throw new ParserException("Only 1 else case can be defined in a switch!");
}
var elseE = (ElseElement)c;
var gp = new GroupResult(elseE.Label);
sw.Else = gp;
BuildResultTreeNodes(gp.Children, elseE.Fields);
}
}
}
else if (item is FieldElement)
{
var element = (FieldElement)item;
prnl.Add(new FieldResult(element));
}
else if (item is LoopElement) // as loop is of type group, it must be checked before
{
var element = (LoopElement)item;
var node = new LoopResult(element);
prnl.Add(node);
BuildResultTreeNodes(node.Template, element.Fields);
}
else if (item is GroupElement)
{
var element = (GroupElement)item;
var node = new GroupResult(element);
prnl.Add(node);
BuildResultTreeNodes(node.Children, element.Fields);
}
else if (item is PartRefElement)
{
var element = (PartRefElement)item;
PartElement pe;
if (!Configuration.Parts.TryFindById(element.PartId, out pe))
{
throw new ParserException(Invariant($"Invalid partRef: unknow part id '{element.PartId}'"));
}
var node = new GroupResult(element.Label);
prnl.Add(node);
BuildResultTreeNodes(node.Children, pe.Fields);
}
else
{
throw new ParserException(Invariant($"Unsupported field with name '{item.Label}'"));
}
}
}
