[api-minor] Replace various getAll methods with iterators

These `getAll` methods are not used anywhere within the PDF.js code-base, outside of tests, and were mostly added (speculatively) for third-party users.
To still allow access to the same data we instead introduce iterators on these classes, which (slightly) shortens the code and allows us to remove the `objectFromMap` helper function.

A summary of the changes in this patch:
 - Replace the `getAll` methods with iterators in the following classes: `AnnotationStorage`, `Metadata`, and `OptionalContentGroup`.

 - Change, and also re-name, `AnnotationStorage.prototype.setAll` into a test-only method since it's not used elsewhere.

 - Remove the `Metadata.prototype.has` method, since it's only used in tests and can be trivially replaced by calling `Metadata.prototype.get` and checking if the returned value is `null`.

src/display/annotation_storage.js

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { objectFromMap, shadow, unreachable } from "../shared/util.js";
+import { shadow, unreachable } from "../shared/util.js";
 import { AnnotationEditor } from "./editor/editor.js";
 import { MurmurHash3_64 } from "../shared/murmurhash3.js";
 
@@ -41,6 +41,17 @@ class AnnotationStorage {
     this.onSetModified = null;
     this.onResetModified = null;
     this.onAnnotationEditor = null;
+
+    if (typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) {
+      // For testing purposes.
+      Object.defineProperty(this, "_setValues", {
+        value: obj => {
+          for (const [key, val] of Object.entries(obj)) {
+            this.setValue(key, val);
+          }
+        },
+      });
+    }
   }
 
   /**
@@ -128,22 +139,6 @@ class AnnotationStorage {
     return this.#storage.has(key);
   }
 
-  /**
-   * @returns {Object | null}
-   */
-  getAll() {
-    return this.#storage.size > 0 ? objectFromMap(this.#storage) : null;
-  }
-
-  /**
-   * @param {Object} obj
-   */
-  setAll(obj) {
-    for (const [key, val] of Object.entries(obj)) {
-      this.setValue(key, val);
-    }
-  }
-
   get size() {
     return this.#storage.size;
   }
@@ -278,6 +273,10 @@ class AnnotationStorage {
       hash: ids.join(","),
     });
   }
+
+  [Symbol.iterator]() {
+    return this.#storage.entries();
+  }
 }
 
 /**

src/display/metadata.js

@@ -13,15 +13,13 @@
  * limitations under the License.
  */
 
-import { objectFromMap } from "../shared/util.js";
-
 class Metadata {
-  #metadataMap;
+  #map;
 
   #data;
 
   constructor({ parsedData, rawData }) {
-    this.#metadataMap = parsedData;
+    this.#map = parsedData;
     this.#data = rawData;
   }
 
@@ -30,15 +28,11 @@ class Metadata {
   }
 
   get(name) {
-    return this.#metadataMap.get(name) ?? null;
+    return this.#map.get(name) ?? null;
   }
 
-  getAll() {
-    return objectFromMap(this.#metadataMap);
-  }
-
-  has(name) {
-    return this.#metadataMap.has(name);
+  [Symbol.iterator]() {
+    return this.#map.entries();
   }
 }
 

src/display/optional_content_config.js

@@ -15,7 +15,6 @@
 
 import {
   info,
-  objectFromMap,
   RenderingIntentFlag,
   unreachable,
   warn,
@@ -301,10 +300,6 @@ class OptionalContentConfig {
     return [...this.#groups.keys()];
   }
 
-  getGroups() {
-    return this.#groups.size > 0 ? objectFromMap(this.#groups) : null;
-  }
-
   getGroup(id) {
     return this.#groups.get(id) || null;
   }
@@ -320,6 +315,10 @@ class OptionalContentConfig {
     }
     return (this.#cachedGetHash = hash.hexdigest());
   }
+
+  [Symbol.iterator]() {
+    return this.#groups.entries();
+  }
 }
 
 export { OptionalContentConfig };

src/shared/util.js

@@ -578,16 +578,6 @@ function objectSize(obj) {
   return Object.keys(obj).length;
 }
 
-// Ensure that the returned Object has a `null` prototype; hence why
-// `Object.fromEntries(...)` is not used.
-function objectFromMap(map) {
-  const obj = Object.create(null);
-  for (const [key, value] of map) {
-    obj[key] = value;
-  }
-  return obj;
-}
-
 // Checks the endianness of the platform.
 function isLittleEndian() {
   const buffer8 = new Uint8Array(4);
@@ -1313,7 +1303,6 @@ export {
   LINE_FACTOR,
   MathClamp,
   normalizeUnicode,
-  objectFromMap,
   objectSize,
   OPS,
   PageActionEventType,

test/driver.js

@@ -738,7 +738,7 @@ class Driver {
                 await page.getAnnotations({ intent: "display" });
               }
             }
-            doc.annotationStorage.setAll(task.annotationStorage);
+            doc.annotationStorage._setValues(task.annotationStorage);
 
             const data = await doc.saveDocument();
             await loadingTask.destroy();
@@ -919,7 +919,7 @@ class Driver {
               pageColors = null;
 
             if (task.annotationStorage) {
-              task.pdfDoc.annotationStorage.setAll(task.annotationStorage);
+              task.pdfDoc.annotationStorage._setValues(task.annotationStorage);
             }
 
             let textLayerCanvas, annotationLayerCanvas, annotationLayerContext;

test/unit/annotation_storage_spec.js

@@ -59,7 +59,7 @@ describe("AnnotationStorage", function () {
     it("should set a new value in the annotation storage", function () {
       const annotationStorage = new AnnotationStorage();
       annotationStorage.setValue("123A", { value: "an other string" });
-      const value = annotationStorage.getAll()["123A"].value;
+      const { value } = annotationStorage.getRawValue("123A");
       expect(value).toEqual("an other string");
     });
 

test/unit/metadata_spec.js

@@ -16,8 +16,6 @@
 import { Metadata } from "../../src/display/metadata.js";
 import { MetadataParser } from "../../src/core/metadata_parser.js";
 
-const emptyObj = Object.create(null);
-
 function createMetadata(data) {
   const metadataParser = new MetadataParser(data);
   return new Metadata(metadataParser.serializable);
@@ -33,13 +31,10 @@ describe("metadata", function () {
       "</rdf:Alt></dc:title></rdf:Description></rdf:RDF></x:xmpmeta>";
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual("Foo bar baz");
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({ "dc:title": "Foo bar baz" });
+    expect([...metadata]).toEqual([["dc:title", "Foo bar baz"]]);
   });
 
   it("should repair and handle invalid metadata", function () {
@@ -51,13 +46,10 @@ describe("metadata", function () {
       "</rdf:Description></rdf:RDF></x:xmpmeta>";
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual("PDF&");
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({ "dc:title": "PDF&" });
+    expect([...metadata]).toEqual([["dc:title", "PDF&"]]);
   });
 
   it("should repair and handle invalid metadata (bug 1424938)", function () {
@@ -94,19 +86,16 @@ describe("metadata", function () {
       "</x:xmpmeta>";
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual(
       "L'Odissee thématique logo Odisséé - décembre 2008.pub"
     );
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({
-      "dc:creator": ["ODIS"],
-      "dc:title": "L'Odissee thématique logo Odisséé - décembre 2008.pub",
-      "xap:creatortool": "PDFCreator Version 0.9.6",
-    });
+    expect([...metadata].sort()).toEqual([
+      ["dc:creator", ["ODIS"]],
+      ["dc:title", "L'Odissee thématique logo Odisséé - décembre 2008.pub"],
+      ["xap:creatortool", "PDFCreator Version 0.9.6"],
+    ]);
   });
 
   it("should gracefully handle incomplete tags (issue 8884)", function () {
@@ -137,7 +126,7 @@ describe("metadata", function () {
       '<?xpacket end="w"?>';
     const metadata = createMetadata(data);
 
-    expect(metadata.getAll()).toEqual(emptyObj);
+    expect([...metadata]).toEqual([]);
   });
 
   it('should gracefully handle "junk" before the actual metadata (issue 10395)', function () {
@@ -168,26 +157,23 @@ describe("metadata", function () {
       '</rdf:Description></rdf:RDF></x:xmpmeta><?xpacket end="w"?>';
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual("");
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({
-      "dc:creator": [""],
-      "dc:description": "",
-      "dc:format": "application/pdf",
-      "dc:subject": [],
-      "dc:title": "",
-      "pdf:keywords": "",
-      "pdf:pdfversion": "1.7",
-      "pdf:producer": "PDFKit.NET 4.0.102.0",
-      "xap:createdate": "2018-12-27T13:50:36-08:00",
-      "xap:creatortool": "",
-      "xap:metadatadate": "2018-12-27T13:50:38-08:00",
-      "xap:modifydate": "2018-12-27T13:50:38-08:00",
-    });
+    expect([...metadata].sort()).toEqual([
+      ["dc:creator", [""]],
+      ["dc:description", ""],
+      ["dc:format", "application/pdf"],
+      ["dc:subject", []],
+      ["dc:title", ""],
+      ["pdf:keywords", ""],
+      ["pdf:pdfversion", "1.7"],
+      ["pdf:producer", "PDFKit.NET 4.0.102.0"],
+      ["xap:createdate", "2018-12-27T13:50:36-08:00"],
+      ["xap:creatortool", ""],
+      ["xap:metadatadate", "2018-12-27T13:50:38-08:00"],
+      ["xap:modifydate", "2018-12-27T13:50:38-08:00"],
+    ]);
   });
 
   it('should correctly handle metadata containing "&apos" (issue 10407)', function () {
@@ -200,13 +186,10 @@ describe("metadata", function () {
       "</rdf:Alt></dc:title></rdf:Description></rdf:RDF></x:xmpmeta>";
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual("'Foo bar baz'");
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({ "dc:title": "'Foo bar baz'" });
+    expect([...metadata]).toEqual([["dc:title", "'Foo bar baz'"]]);
   });
 
   it("should gracefully handle unbalanced end tags (issue 10410)", function () {
@@ -229,7 +212,7 @@ describe("metadata", function () {
       '</rdf:RDF></x:xmpmeta><?xpacket end="w"?>';
     const metadata = createMetadata(data);
 
-    expect(metadata.getAll()).toEqual(emptyObj);
+    expect([...metadata]).toEqual([]);
   });
 
   it("should not be vulnerable to the billion laughs attack", function () {
@@ -258,12 +241,9 @@ describe("metadata", function () {
       "</rdf:RDF>";
     const metadata = createMetadata(data);
 
-    expect(metadata.has("dc:title")).toBeTruthy();
-    expect(metadata.has("dc:qux")).toBeFalsy();
-
     expect(metadata.get("dc:title")).toEqual("a&lol9;b");
     expect(metadata.get("dc:qux")).toEqual(null);
 
-    expect(metadata.getAll()).toEqual({ "dc:title": "a&lol9;b" });
+    expect([...metadata]).toEqual([["dc:title", "a&lol9;b"]]);
   });
 });