From 5bb7f4b615a8ab1d7d43aaca94a2749498bc792d Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sat, 20 Oct 2018 17:15:27 +0200
Subject: [PATCH] Convert `PDFDataRangeTransport` to an ES6 class

---
 src/display/api.js | 92 ++++++++++++++++++++--------------------------
 web/firefoxcom.js  | 22 +++++------
 2 files changed, 48 insertions(+), 66 deletions(-)

diff --git a/src/display/api.js b/src/display/api.js
index deaf7d4af..ca192afe4 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -515,13 +515,11 @@ var PDFDocumentLoadingTask = (function PDFDocumentLoadingTaskClosure() {
 
 /**
  * Abstract class to support range requests file loading.
- * @class
- * @alias PDFDataRangeTransport
  * @param {number} length
  * @param {Uint8Array} initialData
  */
-var PDFDataRangeTransport = (function pdfDataRangeTransportClosure() {
-  function PDFDataRangeTransport(length, initialData) {
+class PDFDataRangeTransport {
+  constructor(length, initialData) {
     this.length = length;
     this.initialData = initialData;
 
@@ -530,63 +528,51 @@ var PDFDataRangeTransport = (function pdfDataRangeTransportClosure() {
     this._progressiveReadListeners = [];
     this._readyCapability = createPromiseCapability();
   }
-  PDFDataRangeTransport.prototype =
-      /** @lends PDFDataRangeTransport.prototype */ {
-    addRangeListener:
-        function PDFDataRangeTransport_addRangeListener(listener) {
-      this._rangeListeners.push(listener);
-    },
 
-    addProgressListener:
-        function PDFDataRangeTransport_addProgressListener(listener) {
-      this._progressListeners.push(listener);
-    },
+  addRangeListener(listener) {
+    this._rangeListeners.push(listener);
+  }
 
-    addProgressiveReadListener:
-        function PDFDataRangeTransport_addProgressiveReadListener(listener) {
-      this._progressiveReadListeners.push(listener);
-    },
+  addProgressListener(listener) {
+    this._progressListeners.push(listener);
+  }
 
-    onDataRange: function PDFDataRangeTransport_onDataRange(begin, chunk) {
-      var listeners = this._rangeListeners;
-      for (var i = 0, n = listeners.length; i < n; ++i) {
-        listeners[i](begin, chunk);
+  addProgressiveReadListener(listener) {
+    this._progressiveReadListeners.push(listener);
+  }
+
+  onDataRange(begin, chunk) {
+    for (const listener of this._rangeListeners) {
+      listener(begin, chunk);
+    }
+  }
+
+  onDataProgress(loaded) {
+    this._readyCapability.promise.then(() => {
+      for (const listener of this._progressListeners) {
+        listener(loaded);
       }
-    },
+    });
+  }
 
-    onDataProgress: function PDFDataRangeTransport_onDataProgress(loaded) {
-      this._readyCapability.promise.then(() => {
-        var listeners = this._progressListeners;
-        for (var i = 0, n = listeners.length; i < n; ++i) {
-          listeners[i](loaded);
-        }
-      });
-    },
+  onDataProgressiveRead(chunk) {
+    this._readyCapability.promise.then(() => {
+      for (const listener of this._progressiveReadListeners) {
+        listener(chunk);
+      }
+    });
+  }
 
-    onDataProgressiveRead:
-        function PDFDataRangeTransport_onDataProgress(chunk) {
-      this._readyCapability.promise.then(() => {
-        var listeners = this._progressiveReadListeners;
-        for (var i = 0, n = listeners.length; i < n; ++i) {
-          listeners[i](chunk);
-        }
-      });
-    },
+  transportReady() {
+    this._readyCapability.resolve();
+  }
 
-    transportReady: function PDFDataRangeTransport_transportReady() {
-      this._readyCapability.resolve();
-    },
+  requestDataRange(begin, end) {
+    unreachable('Abstract method PDFDataRangeTransport.requestDataRange');
+  }
 
-    requestDataRange:
-        function PDFDataRangeTransport_requestDataRange(begin, end) {
-      unreachable('Abstract method PDFDataRangeTransport.requestDataRange');
-    },
-
-    abort: function PDFDataRangeTransport_abort() {
-    },
-  };
-  return PDFDataRangeTransport;
-})();
+  abort() {}
+}
 
 /**
  * Proxy to a PDFDocument in the worker thread. Also, contains commonly used
diff --git a/web/firefoxcom.js b/web/firefoxcom.js
index 27cf9d4ff..e8432b75a 100644
--- a/web/firefoxcom.js
+++ b/web/firefoxcom.js
@@ -198,20 +198,16 @@ class MozL10n {
   }
 })();
 
-function FirefoxComDataRangeTransport(length, initialData) {
-  PDFDataRangeTransport.call(this, length, initialData);
+class FirefoxComDataRangeTransport extends PDFDataRangeTransport {
+  requestDataRange(begin, end) {
+    FirefoxCom.request('requestDataRange', { begin, end, });
+  }
+
+  abort() {
+    // Sync call to ensure abort is really started.
+    FirefoxCom.requestSync('abortLoading', null);
+  }
 }
-FirefoxComDataRangeTransport.prototype =
-  Object.create(PDFDataRangeTransport.prototype);
-FirefoxComDataRangeTransport.prototype.requestDataRange =
-    function FirefoxComDataRangeTransport_requestDataRange(begin, end) {
-  FirefoxCom.request('requestDataRange', { begin, end, });
-};
-FirefoxComDataRangeTransport.prototype.abort =
-    function FirefoxComDataRangeTransport_abort() {
-  // Sync call to ensure abort is really started.
-  FirefoxCom.requestSync('abortLoading', null);
-};
 
 PDFViewerApplication.externalServices = {
   updateFindControlState(data) {