A couple of small scripting/XFA-related tweaks in the worker-code

- Use `PDFManager.ensureDoc`, rather than `PDFManager.ensure`, in a couple of spots in the code. If there exists a short-hand format, we should obviously use it whenever possible.

 - Fix a unit-test helper, to account for the previous changes. (Also, converts a function to be `async` instead.)

 - Add one more exists-check in `PDFDocument.loadXfaFonts`, which I missed to suggest in PR 13146, to prevent any possible errors if the method is ever called in a situation where it shouldn't be.
   Also, print a warning if the actual font-loading fails since that could help future debugging. (Finally, reduce overall indentation in the loop.)

 - Slightly unrelated, but make a small tweak of a comment in `src/core/fonts.js` to reduce possible confusion.

src/core/document.js

@@ -865,7 +865,9 @@ class PDFDocument {
 
   async loadXfaFonts(handler, task) {
     const acroForm = await this.pdfManager.ensureCatalog("acroForm");
-
+    if (!acroForm) {
+      return;
+    }
     const resources = await acroForm.getAsync("DR");
     if (!(resources instanceof Dict)) {
       return;
@@ -902,28 +904,34 @@ class PDFDocument {
 
     for (const [fontName, font] of fonts) {
       const descriptor = font.get("FontDescriptor");
-      if (descriptor instanceof Dict) {
+      if (!(descriptor instanceof Dict)) {
-        const fontFamily = descriptor.get("FontFamily");
+        continue;
-        const fontWeight = descriptor.get("FontWeight");
-        const italicAngle = descriptor.get("ItalicAngle");
-        const cssFontInfo = { fontFamily, fontWeight, italicAngle };
-
-        if (!validateCSSFont(cssFontInfo)) {
-          continue;
-        }
-
-        const promise = partialEvaluator.handleSetFont(
-          resources,
-          [Name.get(fontName), 1],
-          /* fontRef = */ null,
-          operatorList,
-          task,
-          initialState,
-          /* fallbackFontDict = */ null,
-          /* cssFontInfo = */ cssFontInfo
-        );
-        promises.push(promise.catch(() => {}));
       }
+      const fontFamily = descriptor.get("FontFamily");
+      const fontWeight = descriptor.get("FontWeight");
+      const italicAngle = descriptor.get("ItalicAngle");
+      const cssFontInfo = { fontFamily, fontWeight, italicAngle };
+
+      if (!validateCSSFont(cssFontInfo)) {
+        continue;
+      }
+      promises.push(
+        partialEvaluator
+          .handleSetFont(
+            resources,
+            [Name.get(fontName), 1],
+            /* fontRef = */ null,
+            operatorList,
+            task,
+            initialState,
+            /* fallbackFontDict = */ null,
+            /* cssFontInfo = */ cssFontInfo
+          )
+          .catch(function (reason) {
+            warn(`loadXfaFonts: "${reason}".`);
+            return null;
+          })
+      );
     }
     await Promise.all(promises);
   }
@@ -1257,7 +1265,7 @@ class PDFDocument {
   }
 
   get hasJSActions() {
-    const promise = this.pdfManager.ensure(this, "_parseHasJSActions");
+    const promise = this.pdfManager.ensureDoc("_parseHasJSActions");
     return shadow(this, "hasJSActions", promise);
   }
 
@@ -1267,7 +1275,7 @@ class PDFDocument {
   async _parseHasJSActions() {
     const [catalogJsActions, fieldObjects] = await Promise.all([
       this.pdfManager.ensureCatalog("jsActions"),
-      this.pdfManager.ensure(this, "fieldObjects"),
+      this.pdfManager.ensureDoc("fieldObjects"),
     ]);
 
     if (catalogJsActions) {

src/core/fonts.js

@@ -2966,7 +2966,7 @@ var Font = (function FontClosure() {
       }
 
       // When `cssFontInfo` is set, the font is used to render text in the HTML
-      // view (e.g. with Xfa) so nothing must be moved in the private area use.
+      // view (e.g. with Xfa) so nothing must be moved in the private use area.
       if (!properties.cssFontInfo) {
         // Converting glyphs and ids into font's cmap table
         var newMapping = adjustMapping(

src/core/worker.js

@@ -195,7 +195,7 @@ class WorkerMessageHandler {
       ]);
 
       if (isPureXfa) {
-        const task = new WorkerTask("Load fonts for Xfa");
+        const task = new WorkerTask("loadXfaFonts");
         startWorkerTask(task);
         await pdfManager
           .loadXfaFonts(handler, task)

test/unit/document_spec.js

@@ -53,18 +53,18 @@ describe("document", function () {
         get docId() {
           return "d0";
         },
+        ensureDoc(prop, args) {
+          return pdfManager.ensure(pdfDocument, prop, args);
+        },
         ensureCatalog(prop, args) {
           return pdfManager.ensure(catalog, prop, args);
         },
-        ensure(obj, prop, args) {
+        async ensure(obj, prop, args) {
-          return new Promise(function (resolve) {
+          const value = obj[prop];
-            const value = obj[prop];
+          if (typeof value === "function") {
-            if (typeof value === "function") {
+            return value.apply(obj, args);
-              resolve(value.apply(obj, args));
+          }
-            } else {
+          return value;
-              resolve(value);
-            }
-          });
         },
       };
       const pdfDocument = new PDFDocument(pdfManager, stream);