public IEnumerable <string> Transform(ForNode item)
{
_EncounteredOutputStyleBlock = true;
if (!(ShouldRender && _EncounteredOutputStyleBlock))
{
yield break;
}
object?evalObj;
if (item.Expression != null)
{
evalObj = Environment.Evaluation.EvaluateDynamic(item.Expression.Expression, Scopes);
}
else
{
evalObj = item.AlreadyEvaluatedObject;
}
Func <object?[], object?> loopFunction = args =>
{
if (args?.Length != 1)
{
throw new NotImplementedException();
}
return(new ForNode(item.PrimaryBlock, item.ElseBlock, item.VariableNames,
args[0], item.Filter, item.Recursive,
item.EndParsingNode, item.WhiteSpaceControl));
};
var arr = CollectionEx.ToArray(evalObj) ?? Array.Empty <object>();
if (item.Filter != null)
{
var filtered = new List <object?>();
foreach (var arrItem in arr)
{
var unpacked = ReflectionHelpers.Unpack(arrItem, item.VariableNames.Length);
Scopes.Push($"ForNode | Filter: {item.Filter} Item: {arrItem}");
for (var i = 0; i < unpacked.Length; ++i)
{
Scopes.Current.DefineAndSetVariable(item.VariableNames[i], unpacked[i]);
}
var result = Environment.Evaluation.EvaluateDynamic(item.Filter.Expression, Scopes);
Scopes.Pop($"ForNode | Filter: {item.Filter} Item: {arrItem}");
if (TypeCoercion.GetTruthy(result))
{
filtered.Add(arrItem);
}
}
arr = filtered.ToArray();
}
if (arr.Length == 0 && item.ElseBlock != null)
{
foreach (var output in item.ElseBlock.Transform(this))
{
yield return(output);
}
yield break;
}
var depth = 0;
if (Scopes.Current.TryGetVariable <LoopInfo>("loop", out var previousLoopInfo) && previousLoopInfo != null)
{
depth = previousLoopInfo.depth0 + 1;
}
var loopInfo = new LoopInfo(arr, loopFunction, depth);
for (var index = 0; index < arr.Length; ++index)
{
loopInfo.index0 = index;
var arrItem = arr[index];
var unpacked = ReflectionHelpers.Unpack(arrItem, item.VariableNames.Length);
Scopes.Push($"ForNode: {item.Expression} Item: {arrItem}");
for (var i = 0; i < unpacked.Length; ++i)
{
Scopes.Current.DefineAndSetVariable(item.VariableNames[i], unpacked[i]);
}
Scopes.Current.DefineAndSetVariable("loop", loopInfo);
foreach (var output in item.PrimaryBlock.Transform(this))
{
yield return(output);
}
Scopes.Pop($"ForNode: {item.Expression} Item: {arrItem}");
}
yield break;
}
