/// <summary>
/// Map/collect on a given property
/// </summary>
/// <param name="enumerableInput">The enumerable.</param>
/// <param name="property">The property to map.</param>
public static IEnumerable Map(IEnumerable enumerableInput, string property)
{
if (enumerableInput == null)
{
return(null);
}
// Enumerate to a list so we can repeatedly parse through the collection.
List <object> listedInput = enumerableInput.Cast <object>().ToList();
// If the list happens to be empty we are done already.
if (!listedInput.Any())
{
return(listedInput);
}
// Note that liquid assumes that contained complex elements are all following the same schema.
// Hence here we only check if the first element has the property requested for the map.
if (listedInput.All(element => element is IDictionary) &&
((IDictionary)listedInput.First()).Contains(key: property))
{
return(listedInput.Select(element => ((IDictionary)element)[property]));
}
return(listedInput
.Select(selector: element =>
{
if (element == null)
{
return null;
}
var indexable = element as IIndexable;
if (indexable == null)
{
var type = element.GetType();
var safeTypeTransformer = Template.GetSafeTypeTransformer(type);
if (safeTypeTransformer != null)
{
indexable = safeTypeTransformer(element) as DropBase;
}
else
{
var liquidTypeAttribute = type
.GetTypeInfo()
.GetCustomAttributes(attributeType: typeof(LiquidTypeAttribute), inherit: false)
.FirstOrDefault() as LiquidTypeAttribute;
if (liquidTypeAttribute != null)
{
indexable = new DropProxy(element, liquidTypeAttribute.AllowedMembers);
}
else if (TypeUtility.IsAnonymousType(type))
{
return element.RespondTo(property) ? element.Send(property) : element;
}
}
}
return (indexable?.ContainsKey(property) ?? false) ? indexable[property] : null;
}));
}
/// <summary>
/// Resolves namespaced queries gracefully.
///
/// Example
///
/// @context['hash'] = {"name" => 'tobi'}
/// assert_equal 'tobi', @context['hash.name']
/// assert_equal 'tobi', @context['hash["name"]']
/// </summary>
/// <param name="markup"></param>
/// <returns></returns>
private object Variable(string markup)
{
List <string> parts = R.Scan(markup, Liquid.VariableParser);
Regex squareBracketed = new Regex(R.Q(@"^\[(.*)\]$"));
string firstPart = parts.Shift();
Match firstPartSquareBracketedMatch = squareBracketed.Match(firstPart);
if (firstPartSquareBracketedMatch.Success)
{
firstPart = Resolve(firstPartSquareBracketedMatch.Groups[1].Value).ToString();
}
object @object = FindVariable(firstPart);
if (@object != null)
{
foreach (string forEachPart in parts)
{
Match partSquareBracketedMatch = squareBracketed.Match(forEachPart);
bool partResolved = partSquareBracketedMatch.Success;
object part = forEachPart;
if (partResolved)
{
part = Resolve(partSquareBracketedMatch.Groups[1].Value);
}
var partLowcase = (part is string?((string)part).ToLower() : ""); //$ ToLower() supports non-ruby language case style
// If object is a KeyValuePair, we treat it a bit differently - we might be rendering
// an included template.
if (@object is KeyValuePair <string, object> && ((KeyValuePair <string, object>)@object).Key == (string)part)
{
object res = ((KeyValuePair <string, object>)@object).Value;
@object = Liquidize(res);
}
// If object is a hash- or array-like object we look for the
// presence of the key and if its available we return it
else if (IsHashOrArrayLikeObject(@object, part))
{
// If its a proc we will replace the entry with the proc
object res = LookupAndEvaluate(@object, part);
@object = Liquidize(res);
}
// Some special cases. If the part wasn't in square brackets and
// no key with the same name was found we interpret following calls
// as commands and call them on the current object
else if (!partResolved && (@object is IEnumerable) &&
Instrumind.Common.General.IsOneOf(partLowcase, "size", "any", "first", "last"))
{
var castCollection = ((IEnumerable)@object).Cast <object>();
if (partLowcase == "size")
{
@object = castCollection.Count();
}
else if (partLowcase == "any")
{
@object = castCollection.Any();
}
else if (partLowcase == "first")
{
@object = castCollection.FirstOrDefault();
}
else if (partLowcase == "last")
{
@object = castCollection.LastOrDefault();
}
}
else //$ force extraction
{
@object = DropProxy.ExtractValue(@object, forEachPart);
}
// If we are dealing with a drop here we have to
if (@object is IContextAware)
{
((IContextAware)@object).Context = this;
}
}
}
return(@object);
}
