481 lines
14 KiB
JavaScript
481 lines
14 KiB
JavaScript
/* Copyright 2015 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { domEvents } from './dom_events';
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import { parseQueryString } from './ui_utils';
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var PageNumberRegExp = /^\d+$/;
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function isPageNumber(str) {
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return PageNumberRegExp.test(str);
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}
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/**
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* @typedef {Object} PDFLinkServiceOptions
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* @property {EventBus} eventBus - The application event bus.
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*/
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/**
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* Performs navigation functions inside PDF, such as opening specified page,
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* or destination.
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* @class
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* @implements {IPDFLinkService}
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*/
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var PDFLinkService = (function PDFLinkServiceClosure() {
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/**
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* @constructs PDFLinkService
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* @param {PDFLinkServiceOptions} options
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*/
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function PDFLinkService(options) {
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options = options || {};
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this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
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this.baseUrl = null;
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this.pdfDocument = null;
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this.pdfViewer = null;
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this.pdfHistory = null;
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this._pagesRefCache = null;
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}
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PDFLinkService.prototype = {
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setDocument: function PDFLinkService_setDocument(pdfDocument, baseUrl) {
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this.baseUrl = baseUrl;
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this.pdfDocument = pdfDocument;
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this._pagesRefCache = Object.create(null);
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},
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setViewer: function PDFLinkService_setViewer(pdfViewer) {
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this.pdfViewer = pdfViewer;
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},
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setHistory: function PDFLinkService_setHistory(pdfHistory) {
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this.pdfHistory = pdfHistory;
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},
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/**
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* @returns {number}
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*/
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get pagesCount() {
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return this.pdfDocument ? this.pdfDocument.numPages : 0;
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},
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/**
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* @returns {number}
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*/
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get page() {
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return this.pdfViewer.currentPageNumber;
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},
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/**
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* @param {number} value
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*/
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set page(value) {
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this.pdfViewer.currentPageNumber = value;
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},
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/**
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* @param dest - The PDF destination object.
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*/
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navigateTo: function PDFLinkService_navigateTo(dest) {
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var destString = '';
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var self = this;
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var goToDestination = function(destRef) {
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// dest array looks like that: <page-ref> </XYZ|/FitXXX> <args..>
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var pageNumber;
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if (destRef instanceof Object) {
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pageNumber = self._cachedPageNumber(destRef);
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} else if ((destRef | 0) === destRef) { // Integer
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pageNumber = destRef + 1;
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} else {
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console.error('PDFLinkService_navigateTo: "' + destRef +
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'" is not a valid destination reference.');
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return;
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}
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if (pageNumber) {
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if (pageNumber < 1 || pageNumber > self.pagesCount) {
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console.error('PDFLinkService_navigateTo: "' + pageNumber +
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'" is a non-existent page number.');
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return;
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}
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self.pdfViewer.scrollPageIntoView({
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pageNumber: pageNumber,
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destArray: dest,
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});
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if (self.pdfHistory) {
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// Update the browsing history.
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self.pdfHistory.push({
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dest: dest,
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hash: destString,
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page: pageNumber
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});
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}
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} else {
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self.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
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self.cachePageRef(pageIndex + 1, destRef);
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goToDestination(destRef);
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}).catch(function () {
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console.error('PDFLinkService_navigateTo: "' + destRef +
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'" is not a valid page reference.');
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return;
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});
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}
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};
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var destinationPromise;
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if (typeof dest === 'string') {
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destString = dest;
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destinationPromise = this.pdfDocument.getDestination(dest);
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} else {
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destinationPromise = Promise.resolve(dest);
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}
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destinationPromise.then(function(destination) {
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dest = destination;
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if (!(destination instanceof Array)) {
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console.error('PDFLinkService_navigateTo: "' + destination +
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'" is not a valid destination array.');
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return;
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}
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goToDestination(destination[0]);
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});
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},
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/**
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* @param dest - The PDF destination object.
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* @returns {string} The hyperlink to the PDF object.
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*/
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getDestinationHash: function PDFLinkService_getDestinationHash(dest) {
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if (typeof dest === 'string') {
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// In practice, a named destination may contain only a number.
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// If that happens, use the '#nameddest=' form to avoid the link
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// redirecting to a page, instead of the correct destination.
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return this.getAnchorUrl(
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'#' + (isPageNumber(dest) ? 'nameddest=' : '') + escape(dest));
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}
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if (dest instanceof Array) {
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var str = JSON.stringify(dest);
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return this.getAnchorUrl('#' + escape(str));
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}
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return this.getAnchorUrl('');
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},
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/**
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* Prefix the full url on anchor links to make sure that links are resolved
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* relative to the current URL instead of the one defined in <base href>.
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* @param {String} anchor The anchor hash, including the #.
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* @returns {string} The hyperlink to the PDF object.
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*/
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getAnchorUrl: function PDFLinkService_getAnchorUrl(anchor) {
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return (this.baseUrl || '') + anchor;
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},
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/**
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* @param {string} hash
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*/
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setHash: function PDFLinkService_setHash(hash) {
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var pageNumber, dest;
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if (hash.indexOf('=') >= 0) {
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var params = parseQueryString(hash);
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if ('search' in params) {
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this.eventBus.dispatch('findfromurlhash', {
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source: this,
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query: params['search'].replace(/"/g, ''),
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phraseSearch: (params['phrase'] === 'true')
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});
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}
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// borrowing syntax from "Parameters for Opening PDF Files"
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if ('nameddest' in params) {
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if (this.pdfHistory) {
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this.pdfHistory.updateNextHashParam(params.nameddest);
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}
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this.navigateTo(params.nameddest);
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return;
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}
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if ('page' in params) {
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pageNumber = (params.page | 0) || 1;
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}
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if ('zoom' in params) {
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// Build the destination array.
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var zoomArgs = params.zoom.split(','); // scale,left,top
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var zoomArg = zoomArgs[0];
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var zoomArgNumber = parseFloat(zoomArg);
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if (zoomArg.indexOf('Fit') === -1) {
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// If the zoomArg is a number, it has to get divided by 100. If it's
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// a string, it should stay as it is.
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dest = [null, { name: 'XYZ' },
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zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null,
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zoomArgs.length > 2 ? (zoomArgs[2] | 0) : null,
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(zoomArgNumber ? zoomArgNumber / 100 : zoomArg)];
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} else {
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if (zoomArg === 'Fit' || zoomArg === 'FitB') {
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dest = [null, { name: zoomArg }];
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} else if ((zoomArg === 'FitH' || zoomArg === 'FitBH') ||
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(zoomArg === 'FitV' || zoomArg === 'FitBV')) {
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dest = [null, { name: zoomArg },
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zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null];
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} else if (zoomArg === 'FitR') {
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if (zoomArgs.length !== 5) {
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console.error('PDFLinkService_setHash: ' +
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'Not enough parameters for \'FitR\'.');
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} else {
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dest = [null, { name: zoomArg },
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(zoomArgs[1] | 0), (zoomArgs[2] | 0),
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(zoomArgs[3] | 0), (zoomArgs[4] | 0)];
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}
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} else {
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console.error('PDFLinkService_setHash: \'' + zoomArg +
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'\' is not a valid zoom value.');
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}
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}
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}
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if (dest) {
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this.pdfViewer.scrollPageIntoView({
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pageNumber: pageNumber || this.page,
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destArray: dest,
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allowNegativeOffset: true,
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});
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} else if (pageNumber) {
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this.page = pageNumber; // simple page
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}
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if ('pagemode' in params) {
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this.eventBus.dispatch('pagemode', {
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source: this,
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mode: params.pagemode
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});
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}
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} else { // Named (or explicit) destination.
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if ((typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) &&
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isPageNumber(hash) && hash <= this.pagesCount) {
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console.warn('PDFLinkService_setHash: specifying a page number ' +
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'directly after the hash symbol (#) is deprecated, ' +
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'please use the "#page=' + hash + '" form instead.');
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this.page = hash | 0;
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}
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dest = unescape(hash);
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try {
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dest = JSON.parse(dest);
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if (!(dest instanceof Array)) {
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// Avoid incorrectly rejecting a valid named destination, such as
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// e.g. "4.3" or "true", because `JSON.parse` converted its type.
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dest = dest.toString();
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}
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} catch (ex) {}
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if (typeof dest === 'string' || isValidExplicitDestination(dest)) {
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if (this.pdfHistory) {
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this.pdfHistory.updateNextHashParam(dest);
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}
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this.navigateTo(dest);
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return;
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}
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console.error('PDFLinkService_setHash: \'' + unescape(hash) +
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'\' is not a valid destination.');
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}
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},
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/**
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* @param {string} action
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*/
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executeNamedAction: function PDFLinkService_executeNamedAction(action) {
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// See PDF reference, table 8.45 - Named action
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switch (action) {
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case 'GoBack':
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if (this.pdfHistory) {
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this.pdfHistory.back();
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}
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break;
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case 'GoForward':
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if (this.pdfHistory) {
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this.pdfHistory.forward();
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}
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break;
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case 'NextPage':
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if (this.page < this.pagesCount) {
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this.page++;
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}
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break;
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case 'PrevPage':
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if (this.page > 1) {
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this.page--;
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}
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break;
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case 'LastPage':
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this.page = this.pagesCount;
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break;
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case 'FirstPage':
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this.page = 1;
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break;
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default:
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break; // No action according to spec
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}
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this.eventBus.dispatch('namedaction', {
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source: this,
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action: action
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});
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},
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/**
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* @param {Object} params
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*/
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onFileAttachmentAnnotation: function (params) {
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this.eventBus.dispatch('fileattachmentannotation', {
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source: this,
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id: params.id,
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filename: params.filename,
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content: params.content,
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});
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},
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/**
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* @param {number} pageNum - page number.
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* @param {Object} pageRef - reference to the page.
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*/
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cachePageRef: function PDFLinkService_cachePageRef(pageNum, pageRef) {
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var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
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this._pagesRefCache[refStr] = pageNum;
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},
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_cachedPageNumber: function PDFLinkService_cachedPageNumber(pageRef) {
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var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
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return (this._pagesRefCache && this._pagesRefCache[refStr]) || null;
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},
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};
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function isValidExplicitDestination(dest) {
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if (!(dest instanceof Array)) {
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return false;
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}
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var destLength = dest.length, allowNull = true;
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if (destLength < 2) {
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return false;
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}
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var page = dest[0];
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if (!(typeof page === 'object' &&
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typeof page.num === 'number' && (page.num | 0) === page.num &&
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typeof page.gen === 'number' && (page.gen | 0) === page.gen) &&
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!(typeof page === 'number' && (page | 0) === page && page >= 0)) {
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return false;
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}
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var zoom = dest[1];
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if (!(typeof zoom === 'object' && typeof zoom.name === 'string')) {
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return false;
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}
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switch (zoom.name) {
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case 'XYZ':
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if (destLength !== 5) {
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return false;
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}
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break;
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case 'Fit':
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case 'FitB':
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return destLength === 2;
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case 'FitH':
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case 'FitBH':
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case 'FitV':
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case 'FitBV':
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if (destLength !== 3) {
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return false;
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}
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break;
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case 'FitR':
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if (destLength !== 6) {
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return false;
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}
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allowNull = false;
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break;
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default:
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return false;
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}
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for (var i = 2; i < destLength; i++) {
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var param = dest[i];
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if (!(typeof param === 'number' || (allowNull && param === null))) {
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return false;
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}
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}
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return true;
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}
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return PDFLinkService;
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})();
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var SimpleLinkService = (function SimpleLinkServiceClosure() {
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function SimpleLinkService() {}
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SimpleLinkService.prototype = {
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/**
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* @returns {number}
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*/
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get page() {
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return 0;
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},
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/**
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* @param {number} value
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*/
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set page(value) {},
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/**
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* @param dest - The PDF destination object.
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*/
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navigateTo: function (dest) {},
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/**
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* @param dest - The PDF destination object.
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* @returns {string} The hyperlink to the PDF object.
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*/
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getDestinationHash: function (dest) {
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return '#';
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},
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/**
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* @param hash - The PDF parameters/hash.
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* @returns {string} The hyperlink to the PDF object.
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*/
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getAnchorUrl: function (hash) {
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return '#';
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},
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/**
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* @param {string} hash
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*/
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setHash: function (hash) {},
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/**
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* @param {string} action
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*/
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executeNamedAction: function (action) {},
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/**
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* @param {Object} params
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*/
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onFileAttachmentAnnotation: function (params) {},
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/**
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* @param {number} pageNum - page number.
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* @param {Object} pageRef - reference to the page.
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*/
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cachePageRef: function (pageNum, pageRef) {}
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};
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return SimpleLinkService;
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})();
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export {
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PDFLinkService,
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SimpleLinkService,
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};
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