Convert the FileSpec to a "normal" class

src/core/file_spec.js

@@ -17,6 +17,23 @@
 import { isDict, isStream } from "./primitives.js";
 import { stringToPDFString, warn } from "../shared/util.js";
 
+function pickPlatformItem(dict) {
+  // Look for the filename in this order:
+  // UF, F, Unix, Mac, DOS
+  if (dict.has("UF")) {
+    return dict.get("UF");
+  } else if (dict.has("F")) {
+    return dict.get("F");
+  } else if (dict.has("Unix")) {
+    return dict.get("Unix");
+  } else if (dict.has("Mac")) {
+    return dict.get("Mac");
+  } else if (dict.has("DOS")) {
+    return dict.get("DOS");
+  }
+  return null;
+}
+
 /**
  * "A PDF file can refer to the contents of another file by using a File
  * Specification (PDF 1.1)", see the spec (7.11) for more details.
@@ -24,9 +41,8 @@ import { stringToPDFString, warn } from "../shared/util.js";
  * TODO: support the 'URL' file system (with caching if !/V), portable
  * collections attributes and related files (/RF)
  */
-var FileSpec = (function FileSpecClosure() {
+class FileSpec {
-  // eslint-disable-next-line no-shadow
+  constructor(root, xref) {
-  function FileSpec(root, xref) {
     if (!root || !isDict(root)) {
       return;
     }
@@ -48,24 +64,6 @@ var FileSpec = (function FileSpecClosure() {
     }
   }
 
-  function pickPlatformItem(dict) {
-    // Look for the filename in this order:
-    // UF, F, Unix, Mac, DOS
-    if (dict.has("UF")) {
-      return dict.get("UF");
-    } else if (dict.has("F")) {
-      return dict.get("F");
-    } else if (dict.has("Unix")) {
-      return dict.get("Unix");
-    } else if (dict.has("Mac")) {
-      return dict.get("Mac");
-    } else if (dict.has("DOS")) {
-      return dict.get("DOS");
-    }
-    return null;
-  }
-
-  FileSpec.prototype = {
   get filename() {
     if (!this._filename && this.root) {
       var filename = pickPlatformItem(this.root) || "unnamed";
@@ -75,7 +73,8 @@ var FileSpec = (function FileSpecClosure() {
         .replace(/\\/g, "/");
     }
     return this._filename;
-    },
+  }
+
   get content() {
     if (!this.contentAvailable) {
       return null;
@@ -91,23 +90,21 @@ var FileSpec = (function FileSpecClosure() {
         content = fileObj.getBytes();
       } else {
         warn(
-            "Embedded file specification points to non-existing/invalid " +
+          "Embedded file specification points to non-existing/invalid content"
-              "content"
         );
       }
     } else {
       warn("Embedded file specification does not have a content");
     }
     return content;
-    },
+  }
+
   get serializable() {
     return {
       filename: this.filename,
       content: this.content,
     };
-    },
+  }
-  };
+}
-  return FileSpec;
-})();
 
 export { FileSpec };