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| /* Copyright 2015 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { getGlobalEventBus } from './dom_events';
import { parseQueryString } from './ui_utils';
/**
* @typedef {Object} PDFLinkServiceOptions
* @property {EventBus} eventBus - The application event bus.
*/
/**
* Performs navigation functions inside PDF, such as opening specified page,
* or destination.
* @implements {IPDFLinkService}
*/
class PDFLinkService {
/**
* @param {PDFLinkServiceOptions} options
*/
constructor({ eventBus, } = {}) {
this.eventBus = eventBus || getGlobalEventBus();
this.baseUrl = null;
this.pdfDocument = null;
this.pdfViewer = null;
this.pdfHistory = null;
this._pagesRefCache = null;
}
setDocument(pdfDocument, baseUrl) {
this.baseUrl = baseUrl;
this.pdfDocument = pdfDocument;
this._pagesRefCache = Object.create(null);
}
setViewer(pdfViewer) {
this.pdfViewer = pdfViewer;
}
setHistory(pdfHistory) {
this.pdfHistory = pdfHistory;
}
/**
* @returns {number}
*/
get pagesCount() {
return this.pdfDocument ? this.pdfDocument.numPages : 0;
}
/**
* @returns {number}
*/
get page() {
return this.pdfViewer.currentPageNumber;
}
/**
* @param {number} value
*/
set page(value) {
this.pdfViewer.currentPageNumber = value;
}
/**
* @returns {number}
*/
get rotation() {
return this.pdfViewer.pagesRotation;
}
/**
* @param {number} value
*/
set rotation(value) {
this.pdfViewer.pagesRotation = value;
}
/**
* @param {string|Array} dest - The named, or explicit, PDF destination.
*/
navigateTo(dest) {
let goToDestination = ({ namedDest, explicitDest, }) => {
// Dest array looks like that: <page-ref> </XYZ|/FitXXX> <args..>
let destRef = explicitDest[0], pageNumber;
if (destRef instanceof Object) {
pageNumber = this._cachedPageNumber(destRef);
if (pageNumber === null) {
// Fetch the page reference if it's not yet available. This could
// only occur during loading, before all pages have been resolved.
this.pdfDocument.getPageIndex(destRef).then((pageIndex) => {
this.cachePageRef(pageIndex + 1, destRef);
goToDestination({ namedDest, explicitDest, });
}).catch(() => {
console.error(`PDFLinkService.navigateTo: "${destRef}" is not ` +
`a valid page reference, for dest="${dest}".`);
});
return;
}
} else if (Number.isInteger(destRef)) {
pageNumber = destRef + 1;
} else {
console.error(`PDFLinkService.navigateTo: "${destRef}" is not ` +
`a valid destination reference, for dest="${dest}".`);
return;
}
if (!pageNumber || pageNumber < 1 || pageNumber > this.pagesCount) {
console.error(`PDFLinkService.navigateTo: "${pageNumber}" is not ` +
`a valid page number, for dest="${dest}".`);
return;
}
if (this.pdfHistory) {
// Update the browser history before scrolling the new destination into
// view, to be able to accurately capture the current document position.
this.pdfHistory.pushCurrentPosition();
this.pdfHistory.push({ namedDest, explicitDest, pageNumber, });
}
this.pdfViewer.scrollPageIntoView({
pageNumber,
destArray: explicitDest,
});
};
new Promise((resolve, reject) => {
if (typeof dest === 'string') {
this.pdfDocument.getDestination(dest).then((destArray) => {
resolve({
namedDest: dest,
explicitDest: destArray,
});
});
return;
}
resolve({
namedDest: '',
explicitDest: dest,
});
}).then((data) => {
if (!(data.explicitDest instanceof Array)) {
console.error(`PDFLinkService.navigateTo: "${data.explicitDest}" is` +
` not a valid destination array, for dest="${dest}".`);
return;
}
goToDestination(data);
});
}
/**
* @param {string|Array} dest - The PDF destination object.
* @returns {string} The hyperlink to the PDF object.
*/
getDestinationHash(dest) {
if (typeof dest === 'string') {
return this.getAnchorUrl('#' + escape(dest));
}
if (dest instanceof Array) {
let str = JSON.stringify(dest);
return this.getAnchorUrl('#' + escape(str));
}
return this.getAnchorUrl('');
}
/**
* Prefix the full url on anchor links to make sure that links are resolved
* relative to the current URL instead of the one defined in <base href>.
* @param {String} anchor The anchor hash, including the #.
* @returns {string} The hyperlink to the PDF object.
*/
getAnchorUrl(anchor) {
return (this.baseUrl || '') + anchor;
}
/**
* @param {string} hash
*/
setHash(hash) {
let pageNumber, dest;
if (hash.indexOf('=') >= 0) {
let params = parseQueryString(hash);
if ('search' in params) {
this.eventBus.dispatch('findfromurlhash', {
source: this,
query: params['search'].replace(/"/g, ''),
phraseSearch: (params['phrase'] === 'true'),
});
}
// borrowing syntax from "Parameters for Opening PDF Files"
if ('nameddest' in params) {
this.navigateTo(params.nameddest);
return;
}
if ('page' in params) {
pageNumber = (params.page | 0) || 1;
}
if ('zoom' in params) {
// Build the destination array.
let zoomArgs = params.zoom.split(','); // scale,left,top
let zoomArg = zoomArgs[0];
let zoomArgNumber = parseFloat(zoomArg);
if (zoomArg.indexOf('Fit') === -1) {
// If the zoomArg is a number, it has to get divided by 100. If it's
// a string, it should stay as it is.
dest = [null, { name: 'XYZ', },
zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null,
zoomArgs.length > 2 ? (zoomArgs[2] | 0) : null,
(zoomArgNumber ? zoomArgNumber / 100 : zoomArg)];
} else {
if (zoomArg === 'Fit' || zoomArg === 'FitB') {
dest = [null, { name: zoomArg, }];
} else if ((zoomArg === 'FitH' || zoomArg === 'FitBH') ||
(zoomArg === 'FitV' || zoomArg === 'FitBV')) {
dest = [null, { name: zoomArg, },
zoomArgs.length > 1 ? (zoomArgs[1] | 0) : null];
} else if (zoomArg === 'FitR') {
if (zoomArgs.length !== 5) {
console.error(
'PDFLinkService.setHash: Not enough parameters for "FitR".');
} else {
dest = [null, { name: zoomArg, },
(zoomArgs[1] | 0), (zoomArgs[2] | 0),
(zoomArgs[3] | 0), (zoomArgs[4] | 0)];
}
} else {
console.error(`PDFLinkService.setHash: "${zoomArg}" is not ` +
'a valid zoom value.');
}
}
}
if (dest) {
this.pdfViewer.scrollPageIntoView({
pageNumber: pageNumber || this.page,
destArray: dest,
allowNegativeOffset: true,
});
} else if (pageNumber) {
this.page = pageNumber; // simple page
}
if ('pagemode' in params) {
this.eventBus.dispatch('pagemode', {
source: this,
mode: params.pagemode,
});
}
} else { // Named (or explicit) destination.
dest = unescape(hash);
try {
dest = JSON.parse(dest);
if (!(dest instanceof Array)) {
// Avoid incorrectly rejecting a valid named destination, such as
// e.g. "4.3" or "true", because `JSON.parse` converted its type.
dest = dest.toString();
}
} catch (ex) {}
if (typeof dest === 'string' || isValidExplicitDestination(dest)) {
this.navigateTo(dest);
return;
}
console.error(`PDFLinkService.setHash: "${unescape(hash)}" is not ` +
'a valid destination.');
}
}
/**
* @param {string} action
*/
executeNamedAction(action) {
// See PDF reference, table 8.45 - Named action
switch (action) {
case 'GoBack':
if (this.pdfHistory) {
this.pdfHistory.back();
}
break;
case 'GoForward':
if (this.pdfHistory) {
this.pdfHistory.forward();
}
break;
case 'NextPage':
if (this.page < this.pagesCount) {
this.page++;
}
break;
case 'PrevPage':
if (this.page > 1) {
this.page--;
}
break;
case 'LastPage':
this.page = this.pagesCount;
break;
case 'FirstPage':
this.page = 1;
break;
default:
break; // No action according to spec
}
this.eventBus.dispatch('namedaction', {
source: this,
action,
});
}
/**
* @param {Object} params
*/
onFileAttachmentAnnotation({ id, filename, content, }) {
this.eventBus.dispatch('fileattachmentannotation', {
source: this,
id,
filename,
content,
});
}
/**
* @param {number} pageNum - page number.
* @param {Object} pageRef - reference to the page.
*/
cachePageRef(pageNum, pageRef) {
let refStr = pageRef.num + ' ' + pageRef.gen + ' R';
this._pagesRefCache[refStr] = pageNum;
}
_cachedPageNumber(pageRef) {
let refStr = pageRef.num + ' ' + pageRef.gen + ' R';
return (this._pagesRefCache && this._pagesRefCache[refStr]) || null;
}
}
function isValidExplicitDestination(dest) {
if (!(dest instanceof Array)) {
return false;
}
let destLength = dest.length, allowNull = true;
if (destLength < 2) {
return false;
}
let page = dest[0];
if (!(typeof page === 'object' &&
Number.isInteger(page.num) && Number.isInteger(page.gen)) &&
!(Number.isInteger(page) && page >= 0)) {
return false;
}
let zoom = dest[1];
if (!(typeof zoom === 'object' && typeof zoom.name === 'string')) {
return false;
}
switch (zoom.name) {
case 'XYZ':
if (destLength !== 5) {
return false;
}
break;
case 'Fit':
case 'FitB':
return destLength === 2;
case 'FitH':
case 'FitBH':
case 'FitV':
case 'FitBV':
if (destLength !== 3) {
return false;
}
break;
case 'FitR':
if (destLength !== 6) {
return false;
}
allowNull = false;
break;
default:
return false;
}
for (let i = 2; i < destLength; i++) {
let param = dest[i];
if (!(typeof param === 'number' || (allowNull && param === null))) {
return false;
}
}
return true;
}
class SimpleLinkService {
/**
* @returns {number}
*/
get page() {
return 0;
}
/**
* @param {number} value
*/
set page(value) {}
/**
* @returns {number}
*/
get rotation() {
return 0;
}
/**
* @param {number} value
*/
set rotation(value) {}
/**
* @param dest - The PDF destination object.
*/
navigateTo(dest) {}
/**
* @param dest - The PDF destination object.
* @returns {string} The hyperlink to the PDF object.
*/
getDestinationHash(dest) {
return '#';
}
/**
* @param hash - The PDF parameters/hash.
* @returns {string} The hyperlink to the PDF object.
*/
getAnchorUrl(hash) {
return '#';
}
/**
* @param {string} hash
*/
setHash(hash) {}
/**
* @param {string} action
*/
executeNamedAction(action) {}
/**
* @param {Object} params
*/
onFileAttachmentAnnotation({ id, filename, content, }) {}
/**
* @param {number} pageNum - page number.
* @param {Object} pageRef - reference to the page.
*/
cachePageRef(pageNum, pageRef) {}
}
export {
PDFLinkService,
SimpleLinkService,
};
// WEBPACK FOOTER //
// web/pdf_link_service.js |