Print Preview: Fix data/ errors

chrome/browser/resources/print_preview/data/ticket_items/page_range.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview.ticket_items', function() {
   'use strict';
 
   /**
    * Page range ticket item whose value is a {@code string} that represents
    * which pages in the document should be printed.
    * @param {!print_preview.DocumentInfo} documentInfo Information about the
    *     document to print.
    * @constructor
    * @extends {print_preview.ticket_items.TicketItem}
    */
   function PageRange(documentInfo) {
     print_preview.ticket_items.TicketItem.call(
         this,
         null /*appState*/,
         null /*field*/,
         null /*destinationStore*/,
         documentInfo);
-  };
+  }
 
   /**
    * Impossibly large page number.
    * @type {number}
    * @const
    * @private
    */
   PageRange.MAX_PAGE_NUMBER_ = 1000000000;
 
   PageRange.prototype = {
     __proto__: print_preview.ticket_items.TicketItem.prototype,
 
     /** @override */
     wouldValueBeValid: function(value) {
       var result = pageRangeTextToPageRanges(
           value, this.getDocumentInfoInternal().pageCount);
       return result instanceof Array;
     },
 
     /**
      * @return {!print_preview.PageNumberSet} Set of page numbers defined by the
      *     page range string.
      */
     getPageNumberSet: function() {
       var pageNumberList = pageRangeTextToPageList(
-          this.getValue(), this.getDocumentInfoInternal().pageCount);
+          this.getValueAsString_(), this.getDocumentInfoInternal().pageCount);
       return new print_preview.PageNumberSet(pageNumberList);
     },
 
     /** @override */
     isCapabilityAvailable: function() {
       return true;
     },
 
     /** @override */
     getDefaultValueInternal: function() {
       return '';
     },
 
     /** @override */
     getCapabilityNotAvailableValueInternal: function() {
       return '';
     },
 
     /**
+     * @return {string} The value of the ticket item as a string.
+     * @private
+     */
+    getValueAsString_: function() {
+      return /** @type {string} */(this.getValue());
+    },
+
+    /**
      * @return {!Array<Object<{from: number, to: number}>>} A list of page
      *     ranges.
      */
     getPageRanges: function() {
-      var pageRanges = pageRangeTextToPageRanges(this.getValue());
+      var pageRanges = pageRangeTextToPageRanges(this.getValueAsString_());
       return pageRanges instanceof Array ? pageRanges : [];
     },
 
     /**
-     * @return {!Array<object<{from: number, to: number}>>} A list of page
+     * @return {!Array<Object<{from: number, to: number}>>} A list of page
      *     ranges suitable for use in the native layer.
      * TODO(vitalybuka): this should be removed when native layer switched to
      *     page ranges.
      */
     getDocumentPageRanges: function() {
       var pageRanges = pageRangeTextToPageRanges(
-          this.getValue(), this.getDocumentInfoInternal().pageCount);
+          this.getValueAsString_(), this.getDocumentInfoInternal().pageCount);
       return pageRanges instanceof Array ? pageRanges : [];
     },
 
     /**
      * @return {!number} Number of pages reported by the document.
      */
     getDocumentNumPages: function() {
       return this.getDocumentInfoInternal().pageCount;
     },
 
     /**
      * @return {!PageRangeStatus}
      */
     checkValidity: function() {
       var pageRanges = pageRangeTextToPageRanges(
-          this.getValue(), this.getDocumentInfoInternal().pageCount);
+          this.getValueAsString_(), this.getDocumentInfoInternal().pageCount);
       return pageRanges instanceof Array ?
           PageRangeStatus.NO_ERROR : pageRanges;
     },
   };
 
   // Export
   return {
     PageRange: PageRange
   };
 });