1 files changed, 100 insertions, 0 deletions
diff --git a/src/data/composite/things/artwork/withPropertyFromMainArtwork.js b/src/data/composite/things/artwork/withPropertyFromMainArtwork.js
new file mode 100644
index 00000000..a0233119
--- /dev/null
+++ b/src/data/composite/things/artwork/withPropertyFromMainArtwork.js
@@ -0,0 +1,100 @@
+import {input, templateCompositeFrom} from '#composite';
+
+import {withResultOfAvailabilityCheck} from '#composite/control-flow';
+import {withPropertyFromObject} from '#composite/data';
+
+import withContainingArtworkList from './withContainingArtworkList.js';
+
+function getOutputName({
+  [input.staticValue('property')]: property,
+}) {
+  if (property) {
+    return `#mainArtwork.${property}`;
+  } else {
+    return '#value';
+  }
+}
+
+export default templateCompositeFrom({
+  annotation: `withPropertyFromMainArtwork`,
+
+  inputs: {
+    property: input({type: 'string'}),
+    onlyIfAttached: input({type: 'boolean', defaultValue: false}),
+  },
+
+  outputs: inputs => [getOutputName(inputs)],
+
+  steps: () => [
+    {
+      dependencies: [input.staticValue('property')],
+      compute: (continuation, inputs) =>
+        continuation({'#output': getOutputName(inputs)}),
+    },
+
+    {
+      dependencies: [input('onlyIfAttached'), 'attachAbove', '#output'],
+      compute: (continuation, {
+        [input('onlyIfAttached')]: onlyIfAttached,
+        ['attachAbove']: attachAbove,
+        ['#output']: output,
+      }) =>
+        (onlyIfAttached && attachAbove
+          ? continuation()
+       : onlyIfAttached
+          ? continuation.raiseOutput({[output]: null})
+          : continuation()),
+    },
+
+    withContainingArtworkList(),
+
+    withResultOfAvailabilityCheck({
+      from: '#containingArtworkList',
+    }),
+
+    {
+      dependencies: ['#availability', '#output'],
+      compute: (continuation, {
+        ['#availability']: availability,
+        ['#output']: output,
+      }) =>
+        (availability
+          ? continuation()
+          : continuation.raiseOutput({[output]: null})),
+    },
+
+    {
+      dependencies: ['#containingArtworkList'],
+      compute: (continuation, {
+        ['#containingArtworkList']: list,
+      }) =>
+        continuation({'#mainArtwork': list[0]}),
+    },
+
+    {
+      dependencies: [input.myself(), '#mainArtwork', '#output'],
+      compute: (continuation, {
+        [input.myself()]: myself,
+        ['#mainArtwork']: mainArtwork,
+        ['#output']: output,
+      }) =>
+        (myself === mainArtwork
+          ? continuation.raiseOutput({[output]: null})
+          : continuation()),
+    },
+
+    withPropertyFromObject({
+      object: '#mainArtwork',
+      property: input('property'),
+    }),
+
+    {
+      dependencies: ['#value', '#output'],
+      compute: (continuation, {
+        ['#value']: value,
+        ['#output']: output,
+      }) =>
+        continuation.raiseOutput({[output]: value}),
+    },
+  ],
+});