private bool ParseDollar(ProjectItem projectItem, string sourcePath, Stream stream, object context, ref string output)
{
if (stream.Current == '$')
{
var identifier = stream.PeekWord(1);
if (TryGetIdentifier(projectItem, sourcePath, identifier, context, out var value))
{
stream.Advance(identifier.Length);
if (value is IEnumerable <Item> collection)
{
var filter = ParseBlock(stream, '(', ')');
var block = ParseBlock(stream, '[', ']');
var separator = ParseBlock(stream, '[', ']');
if (filter == null && block == null && separator == null)
{
var stringValue = value.ToString();
if (stringValue != value.GetType().FullName)
{
output += stringValue;
}
else
{
output += "$" + identifier;
}
}
else
{
IEnumerable <Item> items;
if (filter != null && filter.StartsWith("$", StringComparison.OrdinalIgnoreCase))
{
var predicate = filter.Remove(0, 1);
if (extensions != null)
{
// Lambda filters are always defined in the first extension type
var c = extensions.FirstOrDefault()?.GetMethod(predicate);
if (c != null)
{
try
{
items = collection.Where(x => (bool)c.Invoke(null, new object[] { x })).ToList();
matchFound = matchFound || items.Any();
}
catch (Exception e)
{
items = Array.Empty <Item>();
hasError = true;
var message = $"Error rendering template. Cannot apply filter to identifier '{identifier}'.";
LogException(e, message, projectItem, sourcePath);
}
}
else
{
items = Array.Empty <Item>();
}
}
else
{
items = Array.Empty <Item>();
}
}
else
{
items = ItemFilter.Apply(collection, filter, ref matchFound);
}
output += string.Join(ParseTemplate(projectItem, sourcePath, separator, context), items.Select(item => ParseTemplate(projectItem, sourcePath, block, item)));
}
}
else if (value is bool)
{
var trueBlock = ParseBlock(stream, '[', ']');
var falseBlock = ParseBlock(stream, '[', ']');
output += ParseTemplate(projectItem, sourcePath, (bool)value ? trueBlock : falseBlock, context);
}
else
{
var block = ParseBlock(stream, '[', ']');
if (value != null)
{
if (block != null)
{
output += ParseTemplate(projectItem, sourcePath, block, value);
}
else
{
output += value.ToString();
}
}
}
return(true);
}
}
return(false);
}
