From ef8acc5d50fa3c23bd7c9d4bb720b7ff78581981 Mon Sep 17 00:00:00 2001
From: "(quasar) nebula" <qznebula@protonmail.com>
Date: Sat, 19 Aug 2023 14:13:31 -0300
Subject: clean up imports & miscellaneous metastructures across codebase

---
 src/find.js | 162 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 src/find.js

(limited to 'src/find.js')

diff --git a/src/find.js b/src/find.js
new file mode 100644
index 00000000..b8230800
--- /dev/null
+++ b/src/find.js
@@ -0,0 +1,162 @@
+import {inspect} from 'node:util';
+
+import {color, logWarn} from '#cli';
+
+function warnOrThrow(mode, message) {
+  if (mode === 'error') {
+    throw new Error(message);
+  }
+
+  if (mode === 'warn') {
+    logWarn(message);
+  }
+
+  return null;
+}
+
+function findHelper(keys, findFns = {}) {
+  // Note: This cache explicitly *doesn't* support mutable data arrays. If the
+  // data array is modified, make sure it's actually a new array object, not
+  // the original, or the cache here will break and act as though the data
+  // hasn't changed!
+  const cache = new WeakMap();
+
+  const byDirectory = findFns.byDirectory || matchDirectory;
+  const byName = findFns.byName || matchName;
+
+  const keyRefRegex = new RegExp(String.raw`^(?:(${keys.join('|')}):(?=\S))?(.*)$`);
+
+  // The mode argument here may be 'warn', 'error', or 'quiet'. 'error' throws
+  // errors for null matches (with details about the error), while 'warn' and
+  // 'quiet' both return null, with 'warn' logging details directly to the
+  // console.
+  return (fullRef, data, {mode = 'warn'} = {}) => {
+    if (!fullRef) return null;
+    if (typeof fullRef !== 'string') {
+      throw new Error(`Got a reference that is ${typeof fullRef}, not string: ${fullRef}`);
+    }
+
+    if (!data) {
+      throw new Error(`Expected data to be present`);
+    }
+
+    if (!Array.isArray(data) && data.wikiData) {
+      throw new Error(`Old {wikiData: {...}} format provided`);
+    }
+
+    let cacheForThisData = cache.get(data);
+    const cachedValue = cacheForThisData?.[fullRef];
+    if (cachedValue) {
+      globalThis.NUM_CACHE = (globalThis.NUM_CACHE || 0) + 1;
+      return cachedValue;
+    }
+    if (!cacheForThisData) {
+      cacheForThisData = Object.create(null);
+      cache.set(data, cacheForThisData);
+    }
+
+    const match = fullRef.match(keyRefRegex);
+    if (!match) {
+      return warnOrThrow(mode, `Malformed link reference: "${fullRef}"`);
+    }
+
+    const key = match[1];
+    const ref = match[2];
+
+    const found = key ? byDirectory(ref, data, mode) : byName(ref, data, mode);
+
+    if (!found) {
+      warnOrThrow(mode, `Didn't match anything for ${color.bright(fullRef)}`);
+    }
+
+    cacheForThisData[fullRef] = found;
+
+    return found;
+  };
+}
+
+function matchDirectory(ref, data) {
+  return data.find(({directory}) => directory === ref);
+}
+
+function matchName(ref, data, mode) {
+  const matches = data.filter(
+    ({name}) => name.toLowerCase() === ref.toLowerCase()
+  );
+
+  if (matches.length > 1) {
+    return warnOrThrow(
+      mode,
+      `Multiple matches for reference "${ref}". Please resolve:\n` +
+        matches.map((match) => `- ${inspect(match)}\n`).join('') +
+        `Returning null for this reference.`
+    );
+  }
+
+  if (matches.length === 0) {
+    return null;
+  }
+
+  const thing = matches[0];
+
+  if (ref !== thing.name) {
+    warnOrThrow(
+      mode,
+      `Bad capitalization: ${color.red(ref)} -> ${color.green(thing.name)}`
+    );
+  }
+
+  return thing;
+}
+
+function matchTagName(ref, data, quiet) {
+  return matchName(ref.startsWith('cw: ') ? ref.slice(4) : ref, data, quiet);
+}
+
+const find = {
+  album: findHelper(['album', 'album-commentary', 'album-gallery']),
+  artist: findHelper(['artist', 'artist-gallery']),
+  artTag: findHelper(['tag'], {byName: matchTagName}),
+  flash: findHelper(['flash']),
+  group: findHelper(['group', 'group-gallery']),
+  listing: findHelper(['listing']),
+  newsEntry: findHelper(['news-entry']),
+  staticPage: findHelper(['static']),
+  track: findHelper(['track']),
+};
+
+export default find;
+
+// Handy utility function for binding the find.thing() functions to a complete
+// wikiData object, optionally taking default options to provide to the find
+// function. Note that this caches the arrays read from wikiData right when it's
+// called, so if their values change, you'll have to continue with a fresh call
+// to bindFind.
+export function bindFind(wikiData, opts1) {
+  return Object.fromEntries(
+    Object.entries({
+      album: 'albumData',
+      artist: 'artistData',
+      artTag: 'artTagData',
+      flash: 'flashData',
+      group: 'groupData',
+      listing: 'listingSpec',
+      newsEntry: 'newsData',
+      staticPage: 'staticPageData',
+      track: 'trackData',
+    }).map(([key, value]) => {
+      const findFn = find[key];
+      const thingData = wikiData[value];
+      return [
+        key,
+        opts1
+          ? (ref, opts2) =>
+              opts2
+                ? findFn(ref, thingData, {...opts1, ...opts2})
+                : findFn(ref, thingData, opts1)
+          : (ref, opts2) =>
+              opts2 ? findFn(ref, thingData, opts2) : findFn(ref, thingData),
+      ];
+    })
+  );
+}
-- 
cgit 1.3.0-6-gf8a5