/// <summary>
/// this calls the renderer with the astRenderer to render
/// the block.
/// </summary>
public void Render(ForBlockTag forBlockTag, ITemplateContext templateContext)
{
var localBlockScope = new SymbolTable();
templateContext.SymbolTableStack.Push(localBlockScope);
try
{
var iterableFactory = forBlockTag.IterableCreator;
// TODO: the Eval may result in an ArrayValue with no Array
// (i.e. it's undefined). THe ToList therefore fails....
// this should use Bind
var iterable = iterableFactory.Eval(templateContext).ToList();
if (forBlockTag.Reversed.BoolValue)
{
iterable.Reverse(); // stupid thing does it in-place.
}
IterateBlock(forBlockTag, templateContext, iterable);
}
finally
{
templateContext.SymbolTableStack.Pop();
}
}
public void Visit(ForBlockTag forBlockTag)
{
_result += forBlockTag.ToString();
}
private void IterateBlock(ForBlockTag forBlockTag, ITemplateContext templateContext, List<IExpressionConstant> iterable)
{
var offset = NumericValue.Create(0);
NumericValue limit = null;
if (!templateContext.Options.NoForLimit)
{
limit = NumericValue.Create(50); // see: https://docs.shopify.com/themes/liquid-documentation/tags/iteration-tags#for
}
if (forBlockTag.Offset != null)
{
var result = LiquidExpressionEvaluator.Eval(forBlockTag.Offset, templateContext);
if (result.IsSuccess)
{
offset = result.SuccessValue<NumericValue>();
}
}
if (forBlockTag.Limit != null)
{
var result = LiquidExpressionEvaluator.Eval(forBlockTag.Limit, templateContext);
if (result.IsSuccess)
{
limit = result.SuccessValue<NumericValue>();
}
}
var subset = iterable.Skip(offset.IntValue);
if (limit != null)
{
subset = subset.Take(limit.IntValue);
}
var subsetList = subset.ToList();
var length = subsetList.Count();
if (length <= 0)
{
_renderingVisitor.StartWalking(forBlockTag.ElseBlock);
return;
}
int iter = 0;
//foreach (var item in iterable.Skip(offset.IntValue).Take(limit.IntValue))
foreach (var item in subsetList)
{
String typename = item == null ? "null" : item.LiquidTypeName;
templateContext.SymbolTableStack.Define("forloop", CreateForLoopDescriptor(
forBlockTag.LocalVariable + "-" + typename, iter, length, templateContext.SymbolTableStack));
templateContext.SymbolTableStack.Define(forBlockTag.LocalVariable, item);
try
{
_renderingVisitor.StartWalking(forBlockTag.LiquidBlock);
}
catch (ContinueException)
{
continue;
}
catch (BreakException)
{
break;
}
iter ++;
}
}
public void Visit(ForBlockTag forBlockTag)
{
new ForRenderer(this).Render(forBlockTag, _templateContext);
}
