« get me outta code hell

Merge branch 'preview' into listing-tweaks - hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
about summary refs log tree commit diff
path: root/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js
diff options
context:
space:
mode:
author(quasar) nebula <qznebula@protonmail.com>2023-10-29 09:26:59 -0300
committer(quasar) nebula <qznebula@protonmail.com>2023-10-29 09:26:59 -0300
commitbfa1953e79a562ee675940b7acc52b5b29d22d8f (patch)
tree5c1cd2f4050c801a60f4b65b367a714ed0979759 /src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js
parentc4ef4ced62d659d217873c6c48dd8038dbf765af (diff)
parent940b2cbf8b68eb0b446cca0feeb507840c486394 (diff)
Merge branch 'preview' into listing-tweaks
Diffstat (limited to 'src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js')
-rw-r--r--src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js b/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js
new file mode 100644
index 00000000..3c39f5ba
--- /dev/null
+++ b/src/data/composite/control-flow/raiseOutputWithoutUpdateValue.js
@@ -0,0 +1,47 @@
+// Raises if this property's update value isn't available.
+// See withResultOfAvailabilityCheck for {mode} options!
+
+import {input, templateCompositeFrom} from '#composite';
+
+import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js';
+import withResultOfAvailabilityCheck from './withResultOfAvailabilityCheck.js';
+
+export default templateCompositeFrom({
+  annotation: `raiseOutputWithoutUpdateValue`,
+
+  inputs: {
+    mode: inputAvailabilityCheckMode(),
+    output: input.staticValue({defaultValue: {}}),
+  },
+
+  outputs: ({
+    [input.staticValue('output')]: output,
+  }) => Object.keys(output),
+
+  steps: () => [
+    withResultOfAvailabilityCheck({
+      from: input.updateValue(),
+      mode: input('mode'),
+    }),
+
+    // TODO: A bit of a kludge, below. Other "do something with the update
+    // value" type functions can get by pretty much just passing that value
+    // as an input (input.updateValue()) into the corresponding "do something
+    // with a dependency/arbitrary value" function. But we can't do that here,
+    // because the special behavior, raiseOutputAbove(), only works to raise
+    // output above the composition it's *directly* nested in. Other languages
+    // have a throw/catch system that might serve as inspiration for something
+    // better here.
+
+    {
+      dependencies: ['#availability', input('output')],
+      compute: (continuation, {
+        ['#availability']: availability,
+        [input('output')]: output,
+      }) =>
+        (availability
+          ? continuation()
+          : continuation.raiseOutputAbove(output)),
+    },
+  ],
+});