chore: Update doc-gen search js

DocGen4/Output.lean

@@ -70,6 +70,7 @@ def htmlOutput (result : AnalyzerResult) (root : String) : IO Unit := do
   FS.writeFile (basePath / "style.css") styleCss
   FS.writeFile (basePath / "404.html") notFoundHtml.toString
   FS.writeFile (basePath / "nav.js") navJs
+  FS.writeFile (basePath / "search.js") searchJs
   for (module, content) in result.moduleInfo.toArray do
     let moduleHtml := ReaderT.run (moduleToHtml content) config
     let path := moduleNameToFile basePath module

DocGen4/Output/Base.lean

@@ -48,6 +48,7 @@ def moduleNameToDirectory (basePath : FilePath) (n : Name) : FilePath :=
 section Static
   def styleCss : String := include_str "./static/style.css"
   def navJs : String := include_str "./static/nav.js"
+  def searchJs : String := include_str "./static/search.js"
 end Static
 
 def declNameToLink (name : Name) : HtmlM String := do

static/nav.js

@@ -106,14 +106,23 @@ if (tse != null) {
 // Simple declaration search
 // -------------------------
 
-const searchWorkerURL = new URL(`${siteRoot}searchWorker.js`, window.location);
-const declSearch = (q) => new Promise((resolve, reject) => {
-  const worker = new SharedWorker(searchWorkerURL);
-  worker.port.start();
-  worker.port.onmessage = ({data}) => resolve(data);
-  worker.port.onmessageerror = (e) => reject(e);
-  worker.port.postMessage({q});
-});
+const declURL = new URL(`${siteRoot}searchable_data.bmp`, window.location);
+const getDecls = (() => {
+  let decls;
+  return () => {
+    if (!decls) decls = new Promise((resolve, reject) => {
+        const req = new XMLHttpRequest();
+        req.responseType = 'json';
+        req.addEventListener('load', () => resolve(loadDecls(req.response)));
+        req.addEventListener('error', () => reject());
+        req.open('GET', declURL);
+        req.send();
+      })
+    return decls;
+  }
+})()
+
+const declSearch = async (q) => getMatches(await getDecls(), q);
 
 const srId = 'search_results';
 document.getElementById('search_form')

static/search.js

@@ -0,0 +1,51 @@
+function isSep(c) {
+    return c === '.' || c === '_';
+}
+
+function matchCaseSensitive(declName, lowerDeclName, pat) {
+    let i = 0, j = 0, err = 0, lastMatch = 0
+    while (i < declName.length && j < pat.length) {
+        if (pat[j] === declName[i] || pat[j] === lowerDeclName[i]) {
+            err += (isSep(pat[j]) ? 0.125 : 1) * (i - lastMatch);
+            if (pat[j] !== declName[i]) err += 0.5;
+            lastMatch = i + 1;
+            j++;
+        } else if (isSep(declName[i])) {
+            err += 0.125 * (i + 1 - lastMatch);
+            lastMatch = i + 1;
+        }
+        i++;
+    }
+    err += 0.125 * (declName.length - lastMatch);
+    if (j === pat.length) {
+        return err;
+    }
+}
+
+function loadDecls(searchableDataCnt) {
+    return searchableDataCnt.map(({name, description}) => [name, name.toLowerCase(), description.toLowerCase()])
+}
+
+function getMatches(decls, pat, maxResults = 30) {
+    const lowerPats = pat.toLowerCase().split(/\s/g);
+    const patNoSpaces = pat.replace(/\s/g, '');
+    const results = [];
+    for (const [decl, lowerDecl, lowerDoc] of decls) {
+        let err = matchCaseSensitive(decl, lowerDecl, patNoSpaces);
+
+        // match all words as substrings of docstring
+        if (!(err < 3) && pat.length > 3 && lowerPats.every(l => lowerDoc.indexOf(l) != -1)) {
+            err = 3;
+        }
+
+        if (err !== undefined) {
+            results.push({decl, err});
+        }
+    }
+    return results.sort(({err: a}, {err: b}) => a - b).slice(0, maxResults);
+}
+
+if (typeof process === 'object') { // NodeJS
+    const data = loadDecls(JSON.parse(require('fs').readFileSync('searchable_data.bmp').toString()));
+    console.log(getMatches(data, process.argv[2] || 'ltltle'));
+}