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// Copyright 2014 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.
'use strict';
/**
* Creates a new OpenPDFParamsParser. This parses the open pdf parameters
* passed in the url to set initial viewport settings for opening the pdf.
* @param {Object} getNamedDestinationsFunction The function called to fetch
* the page number for a named destination.
*/
function OpenPDFParamsParser(getNamedDestinationsFunction) {
this.outstandingRequests_ = [];
this.getNamedDestinationsFunction_ = getNamedDestinationsFunction;
}
OpenPDFParamsParser.prototype = {
/**
* @private
* Parse zoom parameter of open PDF parameters. If this
* parameter is passed while opening PDF then PDF should be opened
* at the specified zoom level.
* @param {number} zoom value.
* @param {Object} viewportPosition to store zoom and position value.
*/
parseZoomParam_: function(paramValue, viewportPosition) {
var paramValueSplit = paramValue.split(',');
if ((paramValueSplit.length != 1) && (paramValueSplit.length != 3))
return;
// User scale of 100 means zoom value of 100% i.e. zoom factor of 1.0.
var zoomFactor = parseFloat(paramValueSplit[0]) / 100;
if (isNaN(zoomFactor))
return;
// Handle #zoom=scale.
if (paramValueSplit.length == 1) {
viewportPosition['zoom'] = zoomFactor;
return;
}
// Handle #zoom=scale,left,top.
var position = {x: parseFloat(paramValueSplit[1]),
y: parseFloat(paramValueSplit[2])};
viewportPosition['position'] = position;
viewportPosition['zoom'] = zoomFactor;
},
/**
* @private
* Parse PDF url parameters. These parameters are mentioned in the url
* and specify actions to be performed when opening pdf files.
* See http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/
* pdfs/pdf_open_parameters.pdf for details.
* @param {string} url that needs to be parsed.
* @param {Function} callback function to be called with viewport info.
*/
getViewportFromUrlParams: function(url, callback) {
var viewportPosition = {};
viewportPosition['url'] = url;
var paramIndex = url.search('#');
if (paramIndex == -1) {
callback(viewportPosition);
return;
}
var paramTokens = url.substring(paramIndex + 1).split('&');
if ((paramTokens.length == 1) && (paramTokens[0].search('=') == -1)) {
// Handle the case of http://foo.com/bar#NAMEDDEST. This is not
// explicitly mentioned except by example in the Adobe
// "PDF Open Parameters" document.
this.outstandingRequests_.push({
callback: callback,
viewportPosition: viewportPosition
});
this.getNamedDestinationsFunction_(paramTokens[0]);
return;
}
var paramsDictionary = {};
for (var i = 0; i < paramTokens.length; ++i) {
var keyValueSplit = paramTokens[i].split('=');
if (keyValueSplit.length != 2)
continue;
paramsDictionary[keyValueSplit[0]] = keyValueSplit[1];
}
if ('page' in paramsDictionary) {
// |pageNumber| is 1-based, but goToPage() take a zero-based page number.
var pageNumber = parseInt(paramsDictionary['page']);
if (!isNaN(pageNumber) && pageNumber > 0)
viewportPosition['page'] = pageNumber - 1;
}
if ('zoom' in paramsDictionary)
this.parseZoomParam_(paramsDictionary['zoom'], viewportPosition);
if (viewportPosition.page === undefined &&
'nameddest' in paramsDictionary) {
this.outstandingRequests_.push({
callback: callback,
viewportPosition: viewportPosition
});
this.getNamedDestinationsFunction_(paramsDictionary['nameddest']);
} else {
callback(viewportPosition);
}
},
/**
* This is called when a named destination is received and the page number
* corresponding to the request for which a named destination is passed.
* @param {number} pageNumber The page corresponding to the named destination
* requested.
*/
onNamedDestinationReceived: function(pageNumber) {
var outstandingRequest = this.outstandingRequests_.shift();
if (pageNumber != -1)
outstandingRequest.viewportPosition.page = pageNumber;
outstandingRequest.callback(outstandingRequest.viewportPosition);
},
};
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