Add support for lists for framing.

Author: gkellogg

lib/json/ld/frame.rb

@@ -126,6 +126,8 @@ def frame(state, subjects, frame, **options)
 
             case
             when list?(o)
+              subframe = frame[prop].first['@list'] if Array(frame[prop]).first.is_a?(Hash)
+              subframe ||= create_implicit_frame(flags)
               # add empty list
               list = {'@list' => []}
               add_frame_output(output, prop, list)
@@ -319,6 +321,23 @@ def filter_subject(subject, frame, state, flags)
               node_values.any? do |nv|
                 node_match?(v, nv, state, flags)
               end
+            elsif list?(v)
+              vv = v['@list'].first
+              node_values = list?(node_values.first) ?
+                node_values.first['@list'] :
+                false
+              if !node_values
+                false # Lists match Lists
+              elsif value?(vv)
+                # Match on any matching value
+                node_values.any? {|nv| value_match?(vv, nv)}
+              elsif node?(vv) || node_reference?(vv)
+                node_values.any? do |nv|
+                  node_match?(vv, nv, state, flags)
+                end
+              else
+                false
+              end
             else
               false # No matching on non-value or node values
             end

spec/frame_spec.rb

@@ -508,6 +508,41 @@
           }]
         })
       },
+      "framed list" => {
+        frame: %({
+          "@context": {
+            "ex": "http://example.org/",
+            "list": {"@id": "ex:list", "@container": "@list"}
+          },
+          "list": [{"@type": "ex:Element"}]
+        }),
+        input: %({
+          "@context": {
+            "ex": "http://example.org/",
+            "list": {"@id": "ex:list", "@container": "@list"}
+          },
+          "@id": "ex:Sub1",
+          "@type": "ex:Type1",
+          "list": [
+            {"@id": "ex:Sub2", "@type": "ex:Element"},
+            "literal1"
+          ]
+        }),
+        output: %({
+          "@context": {
+            "ex": "http://example.org/",
+            "list": {"@id": "ex:list", "@container": "@list"}
+          },
+          "@graph": [{
+            "@id": "ex:Sub1",
+            "@type": "ex:Type1",
+            "list": [
+              {"@id": "ex:Sub2", "@type": "ex:Element"},
+              "literal1"
+            ]
+          }]
+        })
+      },
       "presentation example" => {
         frame: %({
           "@context": {