8 files changed, 293 insertions, 38 deletions

diff --git a/src/data/composite/control-flow/index.js b/src/data/composite/control-flow/index.js
index dfc53db7..7fad88b2 100644
--- a/src/data/composite/control-flow/index.js
+++ b/src/data/composite/control-flow/index.js
@@ -1,3 +1,8 @@
+// #composite/control-flow
+//
+// No entries depend on any other entries, except siblings in this directory.
+//
+
 export {default as exitWithoutDependency} from './exitWithoutDependency.js';
 export {default as exitWithoutUpdateValue} from './exitWithoutUpdateValue.js';
 export {default as exposeConstant} from './exposeConstant.js';
diff --git a/src/data/composite/data/index.js b/src/data/composite/data/index.js
index ecd05129..e2927afd 100644
--- a/src/data/composite/data/index.js
+++ b/src/data/composite/data/index.js
@@ -1,3 +1,8 @@
+// #composite/data
+//
+// Entries here may depend on entries in #composite/control-flow.
+//
+
 export {default as excludeFromList} from './excludeFromList.js';
 export {default as fillMissingListItems} from './fillMissingListItems.js';
 export {default as withFlattenedList} from './withFlattenedList.js';
@@ -6,3 +11,4 @@ export {default as withPropertiesFromObject} from './withPropertiesFromObject.js
 export {default as withPropertyFromList} from './withPropertyFromList.js';
 export {default as withPropertyFromObject} from './withPropertyFromObject.js';
 export {default as withUnflattenedList} from './withUnflattenedList.js';
+export {default as withUniqueItemsOnly} from './withUniqueItemsOnly.js';
diff --git a/src/data/composite/data/withUniqueItemsOnly.js b/src/data/composite/data/withUniqueItemsOnly.js
new file mode 100644
index 00000000..7ee08b08
--- /dev/null
+++ b/src/data/composite/data/withUniqueItemsOnly.js
@@ -0,0 +1,40 @@
+// Excludes duplicate items from a list and provides the results, overwriting
+// the list in-place, if possible.
+
+import {input, templateCompositeFrom} from '#composite';
+import {unique} from '#sugar';
+
+export default templateCompositeFrom({
+  annotation: `withUniqueItemsOnly`,
+
+  inputs: {
+    list: input({type: 'array'}),
+  },
+
+  outputs: ({
+    [input.staticDependency('list')]: list,
+  }) => [list ?? '#uniqueItems'],
+
+  steps: () => [
+    {
+      dependencies: [input('list')],
+      compute: (continuation, {
+        [input('list')]: list,
+      }) => continuation({
+        ['#values']:
+          unique(list),
+      }),
+    },
+
+    {
+      dependencies: ['#values', input.staticDependency('list')],
+      compute: (continuation, {
+        '#values': values,
+        [input.staticDependency('list')]: list,
+      }) => continuation({
+        [list ?? '#uniqueItems']:
+          values,
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-data/index.js b/src/data/composite/wiki-data/index.js
index 1d0400fc..df50a2db 100644
--- a/src/data/composite/wiki-data/index.js
+++ b/src/data/composite/wiki-data/index.js
@@ -1,6 +1,13 @@
+// #composite/wiki-data
+//
+// Entries here may depend on entries in #composite/control-flow and in
+// #composite/data.
+//
+
 export {default as exitWithoutContribs} from './exitWithoutContribs.js';
 export {default as inputThingClass} from './inputThingClass.js';
 export {default as inputWikiData} from './inputWikiData.js';
+export {default as withParsedCommentaryEntries} from './withParsedCommentaryEntries.js';
 export {default as withResolvedContribs} from './withResolvedContribs.js';
 export {default as withResolvedReference} from './withResolvedReference.js';
 export {default as withResolvedReferenceList} from './withResolvedReferenceList.js';
diff --git a/src/data/composite/wiki-data/withParsedCommentaryEntries.js b/src/data/composite/wiki-data/withParsedCommentaryEntries.js
new file mode 100644
index 00000000..edfc9e3c
--- /dev/null
+++ b/src/data/composite/wiki-data/withParsedCommentaryEntries.js
@@ -0,0 +1,179 @@
+import {input, templateCompositeFrom} from '#composite';
+import find from '#find';
+import {stitchArrays} from '#sugar';
+import {isCommentary} from '#validators';
+import {commentaryRegex} from '#wiki-data';
+
+import {
+  fillMissingListItems,
+  withFlattenedList,
+  withPropertiesFromList,
+  withUnflattenedList,
+} from '#composite/data';
+
+import withResolvedReferenceList from './withResolvedReferenceList.js';
+
+export default templateCompositeFrom({
+  annotation: `withParsedCommentaryEntries`,
+
+  inputs: {
+    from: input({validate: isCommentary}),
+  },
+
+  outputs: ['#parsedCommentaryEntries'],
+
+  steps: () => [
+    {
+      dependencies: [input('from')],
+
+      compute: (continuation, {
+        [input('from')]: commentaryText,
+      }) => continuation({
+        ['#rawMatches']:
+          Array.from(commentaryText.matchAll(commentaryRegex)),
+      }),
+    },
+
+    withPropertiesFromList({
+      list: '#rawMatches',
+      properties: input.value([
+        '0', // The entire match as a string.
+        'groups',
+        'index',
+      ]),
+    }).outputs({
+      '#rawMatches.0': '#rawMatches.text',
+      '#rawMatches.groups': '#rawMatches.groups',
+      '#rawMatches.index': '#rawMatches.startIndex',
+    }),
+
+    {
+      dependencies: [
+        '#rawMatches.text',
+        '#rawMatches.startIndex',
+      ],
+
+      compute: (continuation, {
+        ['#rawMatches.text']: text,
+        ['#rawMatches.startIndex']: startIndex,
+      }) => continuation({
+        ['#rawMatches.endIndex']:
+          stitchArrays({text, startIndex})
+            .map(({text, startIndex}) => startIndex + text.length),
+      }),
+    },
+
+    {
+      dependencies: [
+        input('from'),
+        '#rawMatches.startIndex',
+        '#rawMatches.endIndex',
+      ],
+
+      compute: (continuation, {
+        [input('from')]: commentaryText,
+        ['#rawMatches.startIndex']: startIndex,
+        ['#rawMatches.endIndex']: endIndex,
+      }) => continuation({
+        ['#entries.body']:
+          stitchArrays({startIndex, endIndex})
+            .map(({endIndex}, index, stitched) =>
+              (index === stitched.length - 1
+                ? commentaryText.slice(endIndex)
+                : commentaryText.slice(
+                    endIndex,
+                    stitched[index + 1].startIndex)))
+            .map(body => body.trim()),
+      }),
+    },
+
+    withPropertiesFromList({
+      list: '#rawMatches.groups',
+      prefix: input.value('#entries'),
+      properties: input.value([
+        'artistReferences',
+        'artistDisplayText',
+        'annotation',
+        'date',
+      ]),
+    }),
+
+    // The artistReferences group will always have a value, since it's required
+    // for the line to match in the first place.
+
+    {
+      dependencies: ['#entries.artistReferences'],
+      compute: (continuation, {
+        ['#entries.artistReferences']: artistReferenceTexts,
+      }) => continuation({
+        ['#entries.artistReferences']:
+          artistReferenceTexts
+            .map(text => text.split(',').map(ref => ref.trim())),
+      }),
+    },
+
+    withFlattenedList({
+      list: '#entries.artistReferences',
+    }),
+
+    withResolvedReferenceList({
+      list: '#flattenedList',
+      data: 'artistData',
+      find: input.value(find.artist),
+      notFoundMode: input.value('null'),
+    }),
+
+    withUnflattenedList({
+      list: '#resolvedReferenceList',
+    }).outputs({
+      '#unflattenedList': '#entries.artists',
+    }),
+
+    fillMissingListItems({
+      list: '#entries.artistDisplayText',
+      fill: input.value(null),
+    }),
+
+    fillMissingListItems({
+      list: '#entries.annotation',
+      fill: input.value(null),
+    }),
+
+    {
+      dependencies: ['#entries.date'],
+      compute: (continuation, {
+        ['#entries.date']: date,
+      }) => continuation({
+        ['#entries.date']:
+          date.map(date => date ? new Date(date) : null),
+      }),
+    },
+
+    {
+      dependencies: [
+        '#entries.artists',
+        '#entries.artistDisplayText',
+        '#entries.annotation',
+        '#entries.date',
+        '#entries.body',
+      ],
+
+      compute: (continuation, {
+        ['#entries.artists']: artists,
+        ['#entries.artistDisplayText']: artistDisplayText,
+        ['#entries.annotation']: annotation,
+        ['#entries.date']: date,
+        ['#entries.body']: body,
+      }) => continuation({
+        ['#parsedCommentaryEntries']:
+          stitchArrays({
+            artists,
+            artistDisplayText,
+            annotation,
+            date,
+            body,
+          }),
+      }),
+    },
+  ],
+});
diff --git a/src/data/composite/wiki-properties/commentary.js b/src/data/composite/wiki-properties/commentary.js
index fbea9d5c..cd6b7ac4 100644
--- a/src/data/composite/wiki-properties/commentary.js
+++ b/src/data/composite/wiki-properties/commentary.js
@@ -1,12 +1,30 @@
 // Artist commentary! Generally present on tracks and albums.
 
+import {input, templateCompositeFrom} from '#composite';
 import {isCommentary} from '#validators';
 
-// TODO: Not templateCompositeFrom.
+import {exitWithoutDependency, exposeDependency}
+  from '#composite/control-flow';
+import {withParsedCommentaryEntries} from '#composite/wiki-data';
 
-export default function() {
-  return {
-    flags: {update: true, expose: true},
-    update: {validate: isCommentary},
-  };
-}
+export default templateCompositeFrom({
+  annotation: `commentary`,
+
+  compose: false,
+
+  steps: () => [
+    exitWithoutDependency({
+      dependency: input.updateValue({validate: isCommentary}),
+      mode: input.value('falsy'),
+      value: input.value(null),
+    }),
+
+    withParsedCommentaryEntries({
+      from: input.updateValue(),
+    }),
+
+    exposeDependency({
+      dependency: '#parsedCommentaryEntries',
+    }),
+  ],
+});
diff --git a/src/data/composite/wiki-properties/commentatorArtists.js b/src/data/composite/wiki-properties/commentatorArtists.js
index 52aeb868..f400bbfc 100644
--- a/src/data/composite/wiki-properties/commentatorArtists.js
+++ b/src/data/composite/wiki-properties/commentatorArtists.js
@@ -1,13 +1,14 @@
-// This one's kinda tricky: it parses artist "references" from the
-// commentary content, and finds the matching artist for each reference.
+// List of artists referenced in commentary entries.
 // This is mostly useful for credits and listings on artist pages.
 
 import {input, templateCompositeFrom} from '#composite';
-import find from '#find';
 import {unique} from '#sugar';
 
-import {exitWithoutDependency} from '#composite/control-flow';
-import {withResolvedReferenceList} from '#composite/wiki-data';
+import {exitWithoutDependency, exposeDependency}
+  from '#composite/control-flow';
+import {withFlattenedList, withPropertyFromList, withUniqueItemsOnly}
+  from '#composite/data';
+import {withParsedCommentaryEntries} from '#composite/wiki-data';
 
 export default templateCompositeFrom({
   annotation: `commentatorArtists`,
@@ -21,35 +22,29 @@ export default templateCompositeFrom({
       value: input.value([]),
     }),
 
-    {
-      dependencies: ['commentary'],
-      compute: (continuation, {commentary}) =>
-        continuation({
-          '#artistRefs':
-            Array.from(
-              commentary
-                .replace(/<\/?b>/g, '')
-                .matchAll(/<i>(?<who>.*?):<\/i>/g))
-              .map(({groups: {who}}) => who),
-        }),
-    },
-
-    withResolvedReferenceList({
-      list: '#artistRefs',
-      data: 'artistData',
-      find: input.value(find.artist),
+    withParsedCommentaryEntries({
+      from: 'commentary',
+    }),
+
+    withPropertyFromList({
+      list: '#parsedCommentaryEntries',
+      property: input.value('artists'),
     }).outputs({
-      '#resolvedReferenceList': '#artists',
+      '#parsedCommentaryEntries.artists': '#artistLists',
     }),
 
-    {
-      flags: {expose: true},
+    withFlattenedList({
+      list: '#artistLists',
+    }).outputs({
+      '#flattenedList': '#artists',
+    }),
 
-      expose: {
-        dependencies: ['#artists'],
-        compute: ({'#artists': artists}) =>
-          unique(artists),
-      },
-    },
+    withUniqueItemsOnly({
+      list: '#artists',
+    }),
+
+    exposeDependency({
+      dependency: '#artists',
+    }),
   ],
 });
diff --git a/src/data/composite/wiki-properties/index.js b/src/data/composite/wiki-properties/index.js
index 7607e361..17d51bb8 100644
--- a/src/data/composite/wiki-properties/index.js
+++ b/src/data/composite/wiki-properties/index.js
@@ -1,3 +1,8 @@
+// #composite/wiki-properties
+//
+// Entries here may depend on entries in #composite/control-flow,
+// #composite/data, and #composite/wiki-data.
+
 export {default as additionalFiles} from './additionalFiles.js';
 export {default as additionalNameList} from './additionalNameList.js';
 export {default as color} from './color.js';