chrome/browser/resources/pdf/open_pdf_params_parser.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 'use strict';
   6
   7 /**
   8  * Creates a new OpenPDFParamsParser. This parses the open pdf parameters
   9  * passed in the url to set initial viewport settings for opening the pdf.
  10  * @param {string} url to be parsed.
  11  */
  12 function OpenPDFParamsParser(url) {
  13   this.url_ = url;
  14   this.urlParams = {};
  15   this.parseOpenPDFParams_();
  16 }
  17
  18 OpenPDFParamsParser.prototype = {
  19   /**
  20    * @private
  21    * Parse zoom parameter of open PDF parameters. If this
  22    * parameter is passed while opening PDF then PDF should be opened
  23    * at the specified zoom level.
  24    * @param {number} zoom value.
  25    */
  26   parseZoomParam_: function(paramValue) {
  27     var paramValueSplit = paramValue.split(',');
  28     if ((paramValueSplit.length != 1) && (paramValueSplit.length != 3))
  29       return;
  30
  31     // User scale of 100 means zoom value of 100% i.e. zoom factor of 1.0.
  32     var zoomFactor = parseFloat(paramValueSplit[0]) / 100;
  33     if (isNaN(zoomFactor))
  34       return;
  35
  36     // Handle #zoom=scale.
  37     if (paramValueSplit.length == 1) {
  38       this.urlParams['zoom'] = zoomFactor;
  39       return;
  40     }
  41
  42     // Handle #zoom=scale,left,top.
  43     var position = {x: parseFloat(paramValueSplit[1]),
  44                     y: parseFloat(paramValueSplit[2])};
  45     this.urlParams['position'] = position;
  46     this.urlParams['zoom'] = zoomFactor;
  47   },
  48
  49   /**
  50    * @private
  51    * Parse open PDF parameters. These parameters are mentioned in the url
  52    * and specify actions to be performed when opening pdf files.
  53    * See http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/
  54    * pdfs/pdf_open_parameters.pdf for details.
  55    */
  56   parseOpenPDFParams_: function() {
  57     var originalUrl = this.url_;
  58     var paramIndex = originalUrl.search('#');
  59     if (paramIndex == -1)
  60       return;
  61
  62     var paramTokens = originalUrl.substring(paramIndex + 1).split('&');
  63     var paramsDictionary = {};
  64     for (var i = 0; i < paramTokens.length; ++i) {
  65       var keyValueSplit = paramTokens[i].split('=');
  66       if (keyValueSplit.length != 2)
  67         continue;
  68       paramsDictionary[keyValueSplit[0]] = keyValueSplit[1];
  69     }
  70
  71     if ('page' in paramsDictionary) {
  72       // |pageNumber| is 1-based, but goToPage() take a zero-based page number.
  73       var pageNumber = parseInt(paramsDictionary['page']);
  74       if (!isNaN(pageNumber))
  75         this.urlParams['page'] = pageNumber - 1;
  76     }
  77
  78     if ('zoom' in paramsDictionary)
  79       this.parseZoomParam_(paramsDictionary['zoom']);
  80   }
  81 };