Merge pull request #10 from g-Off/filter-context

introduce the initial FilterContext type that is passed into a FilterFunc

Author: g-Off

Sources/Liquid/Expression.swift

@@ -99,11 +99,11 @@ struct Expression: CustomStringConvertible {
 				} else {
 					switch filter {
 					case .size:
-						result = try? Filters.sizeFilter(value: data, args: [], kwargs: [:], encoder: context.encoder)
+						result = try? Filters.sizeFilter(value: data, args: [], kwargs: [:], context: FilterContext(context: context))
 					case .first:
-						result = try? Filters.firstFilter(value: data, args: [], kwargs: [:], encoder: context.encoder)
+						result = try? Filters.firstFilter(value: data, args: [], kwargs: [:], context: FilterContext(context: context))
 					case .last:
-						result = try? Filters.lastFilter(value: data, args: [], kwargs: [:], encoder: context.encoder)
+						result = try? Filters.lastFilter(value: data, args: [], kwargs: [:], context: FilterContext(context: context))
 					}
 				}
 			} else {