8b4ae6f3eb
Sometimes we also used `@return` or `@returns`, but `@type` is what the JSDoc documentation recommends. This also improves the documentation because before this commit the types were not shown and now they are.
717 lines
23 KiB
JavaScript
717 lines
23 KiB
JavaScript
/* Copyright 2012 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 { getGlobalEventBus, scrollIntoView } from './ui_utils';
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import { createPromiseCapability } from 'pdfjs-lib';
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import { getCharacterType } from './pdf_find_utils';
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const FindState = {
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FOUND: 0,
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NOT_FOUND: 1,
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WRAPPED: 2,
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PENDING: 3,
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};
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const FIND_TIMEOUT = 250; // ms
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const MATCH_SCROLL_OFFSET_TOP = -50; // px
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const MATCH_SCROLL_OFFSET_LEFT = -400; // px
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const CHARACTERS_TO_NORMALIZE = {
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'\u2018': '\'', // Left single quotation mark
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'\u2019': '\'', // Right single quotation mark
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'\u201A': '\'', // Single low-9 quotation mark
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'\u201B': '\'', // Single high-reversed-9 quotation mark
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'\u201C': '"', // Left double quotation mark
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'\u201D': '"', // Right double quotation mark
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'\u201E': '"', // Double low-9 quotation mark
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'\u201F': '"', // Double high-reversed-9 quotation mark
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'\u00BC': '1/4', // Vulgar fraction one quarter
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'\u00BD': '1/2', // Vulgar fraction one half
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'\u00BE': '3/4', // Vulgar fraction three quarters
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};
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let normalizationRegex = null;
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function normalize(text) {
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if (!normalizationRegex) {
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// Compile the regular expression for text normalization once.
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const replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
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normalizationRegex = new RegExp(`[${replace}]`, 'g');
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}
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return text.replace(normalizationRegex, function(ch) {
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return CHARACTERS_TO_NORMALIZE[ch];
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});
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}
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/**
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* @typedef {Object} PDFFindControllerOptions
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* @property {IPDFLinkService} linkService - The navigation/linking service.
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* @property {EventBus} eventBus - The application event bus.
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*/
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/**
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* Provides search functionality to find a given string in a PDF document.
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*/
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class PDFFindController {
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/**
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* @param {PDFFindControllerOptions} options
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*/
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constructor({ linkService, eventBus = getGlobalEventBus(), }) {
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this._linkService = linkService;
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this._eventBus = eventBus;
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this._reset();
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eventBus.on('findbarclose', this._onFindBarClose.bind(this));
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}
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get highlightMatches() {
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return this._highlightMatches;
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}
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get pageMatches() {
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return this._pageMatches;
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}
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get pageMatchesLength() {
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return this._pageMatchesLength;
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}
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get selected() {
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return this._selected;
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}
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get state() {
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return this._state;
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}
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/**
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* Set a reference to the PDF document in order to search it.
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* Note that searching is not possible if this method is not called.
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*
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* @param {PDFDocumentProxy} pdfDocument - The PDF document to search.
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*/
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setDocument(pdfDocument) {
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if (this._pdfDocument) {
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this._reset();
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}
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if (!pdfDocument) {
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return;
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}
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this._pdfDocument = pdfDocument;
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this._firstPageCapability.resolve();
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}
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executeCommand(cmd, state) {
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if (!state) {
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return;
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}
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const pdfDocument = this._pdfDocument;
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if (this._state === null || this._shouldDirtyMatch(cmd, state)) {
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this._dirtyMatch = true;
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}
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this._state = state;
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if (cmd !== 'findhighlightallchange') {
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this._updateUIState(FindState.PENDING);
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}
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this._firstPageCapability.promise.then(() => {
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// If the document was closed before searching began, or if the search
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// operation was relevant for a previously opened document, do nothing.
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if (!this._pdfDocument ||
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(pdfDocument && this._pdfDocument !== pdfDocument)) {
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return;
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}
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this._extractText();
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const findbarClosed = !this._highlightMatches;
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const pendingTimeout = !!this._findTimeout;
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if (this._findTimeout) {
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clearTimeout(this._findTimeout);
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this._findTimeout = null;
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}
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if (cmd === 'find') {
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// Trigger the find action with a small delay to avoid starting the
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// search when the user is still typing (saving resources).
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this._findTimeout = setTimeout(() => {
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this._nextMatch();
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this._findTimeout = null;
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}, FIND_TIMEOUT);
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} else if (this._dirtyMatch) {
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// Immediately trigger searching for non-'find' operations, when the
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// current state needs to be reset and matches re-calculated.
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this._nextMatch();
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} else if (cmd === 'findagain') {
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this._nextMatch();
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// When the findbar was previously closed, and `highlightAll` is set,
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// ensure that the matches on all active pages are highlighted again.
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if (findbarClosed && this._state.highlightAll) {
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this._updateAllPages();
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}
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} else if (cmd === 'findhighlightallchange') {
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// If there was a pending search operation, synchronously trigger a new
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// search *first* to ensure that the correct matches are highlighted.
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if (pendingTimeout) {
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this._nextMatch();
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} else {
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this._highlightMatches = true;
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}
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this._updateAllPages(); // Update the highlighting on all active pages.
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} else {
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this._nextMatch();
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}
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});
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}
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scrollMatchIntoView({ element = null, pageIndex = -1, matchIndex = -1, }) {
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if (!this._scrollMatches || !element) {
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return;
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} else if (matchIndex === -1 || matchIndex !== this._selected.matchIdx) {
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return;
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} else if (pageIndex === -1 || pageIndex !== this._selected.pageIdx) {
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return;
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}
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this._scrollMatches = false; // Ensure that scrolling only happens once.
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const spot = {
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top: MATCH_SCROLL_OFFSET_TOP,
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left: MATCH_SCROLL_OFFSET_LEFT,
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};
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scrollIntoView(element, spot, /* skipOverflowHiddenElements = */ true);
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}
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_reset() {
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this._highlightMatches = false;
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this._scrollMatches = false;
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this._pdfDocument = null;
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this._pageMatches = [];
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this._pageMatchesLength = [];
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this._state = null;
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this._selected = { // Currently selected match.
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pageIdx: -1,
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matchIdx: -1,
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};
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this._offset = { // Where the find algorithm currently is in the document.
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pageIdx: null,
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matchIdx: null,
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wrapped: false,
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};
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this._extractTextPromises = [];
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this._pageContents = []; // Stores the normalized text for each page.
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this._matchesCountTotal = 0;
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this._pagesToSearch = null;
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this._pendingFindMatches = Object.create(null);
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this._resumePageIdx = null;
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this._dirtyMatch = false;
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clearTimeout(this._findTimeout);
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this._findTimeout = null;
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this._firstPageCapability = createPromiseCapability();
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}
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/**
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* @type {string} The (current) normalized search query.
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*/
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get _query() {
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if (this._state.query !== this._rawQuery) {
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this._rawQuery = this._state.query;
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this._normalizedQuery = normalize(this._state.query);
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}
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return this._normalizedQuery;
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}
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_shouldDirtyMatch(cmd, state) {
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// When the search query changes, regardless of the actual search command
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// used, always re-calculate matches to avoid errors (fixes bug 1030622).
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if (state.query !== this._state.query) {
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return true;
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}
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switch (cmd) {
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case 'findagain':
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const pageNumber = this._selected.pageIdx + 1;
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const linkService = this._linkService;
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// Only treat a 'findagain' event as a new search operation when it's
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// *absolutely* certain that the currently selected match is no longer
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// visible, e.g. as a result of the user scrolling in the document.
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//
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// NOTE: If only a simple `this._linkService.page` check was used here,
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// there's a risk that consecutive 'findagain' operations could "skip"
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// over matches at the top/bottom of pages thus making them completely
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// inaccessible when there's multiple pages visible in the viewer.
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if (pageNumber >= 1 && pageNumber <= linkService.pagesCount &&
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pageNumber !== linkService.page &&
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!linkService.isPageVisible(pageNumber)) {
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return true;
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}
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return false;
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case 'findhighlightallchange':
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return false;
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}
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return true;
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}
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/**
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* Helper for multi-term search that fills the `matchesWithLength` array
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* and handles cases where one search term includes another search term (for
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* example, "tamed tame" or "this is"). It looks for intersecting terms in
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* the `matches` and keeps elements with a longer match length.
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*/
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_prepareMatches(matchesWithLength, matches, matchesLength) {
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function isSubTerm(matchesWithLength, currentIndex) {
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const currentElem = matchesWithLength[currentIndex];
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const nextElem = matchesWithLength[currentIndex + 1];
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// Check for cases like "TAMEd TAME".
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if (currentIndex < matchesWithLength.length - 1 &&
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currentElem.match === nextElem.match) {
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currentElem.skipped = true;
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return true;
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}
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// Check for cases like "thIS IS".
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for (let i = currentIndex - 1; i >= 0; i--) {
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const prevElem = matchesWithLength[i];
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if (prevElem.skipped) {
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continue;
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}
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if (prevElem.match + prevElem.matchLength < currentElem.match) {
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break;
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}
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if (prevElem.match + prevElem.matchLength >=
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currentElem.match + currentElem.matchLength) {
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currentElem.skipped = true;
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return true;
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}
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}
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return false;
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}
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// Sort the array of `{ match: <match>, matchLength: <matchLength> }`
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// objects on increasing index first and on the length otherwise.
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matchesWithLength.sort(function(a, b) {
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return a.match === b.match ? a.matchLength - b.matchLength :
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a.match - b.match;
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});
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for (let i = 0, len = matchesWithLength.length; i < len; i++) {
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if (isSubTerm(matchesWithLength, i)) {
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continue;
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}
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matches.push(matchesWithLength[i].match);
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matchesLength.push(matchesWithLength[i].matchLength);
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}
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}
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/**
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* Determine if the search query constitutes a "whole word", by comparing the
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* first/last character type with the preceding/following character type.
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*/
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_isEntireWord(content, startIdx, length) {
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if (startIdx > 0) {
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const first = content.charCodeAt(startIdx);
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const limit = content.charCodeAt(startIdx - 1);
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if (getCharacterType(first) === getCharacterType(limit)) {
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return false;
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}
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}
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const endIdx = (startIdx + length - 1);
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if (endIdx < (content.length - 1)) {
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const last = content.charCodeAt(endIdx);
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const limit = content.charCodeAt(endIdx + 1);
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if (getCharacterType(last) === getCharacterType(limit)) {
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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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_calculatePhraseMatch(query, pageIndex, pageContent, entireWord) {
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const matches = [];
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const queryLen = query.length;
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let matchIdx = -queryLen;
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while (true) {
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matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
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if (matchIdx === -1) {
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break;
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}
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if (entireWord && !this._isEntireWord(pageContent, matchIdx, queryLen)) {
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continue;
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}
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matches.push(matchIdx);
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}
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this._pageMatches[pageIndex] = matches;
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}
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_calculateWordMatch(query, pageIndex, pageContent, entireWord) {
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const matchesWithLength = [];
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// Divide the query into pieces and search for text in each piece.
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const queryArray = query.match(/\S+/g);
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for (let i = 0, len = queryArray.length; i < len; i++) {
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const subquery = queryArray[i];
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const subqueryLen = subquery.length;
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let matchIdx = -subqueryLen;
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while (true) {
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matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);
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if (matchIdx === -1) {
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break;
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}
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if (entireWord &&
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!this._isEntireWord(pageContent, matchIdx, subqueryLen)) {
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continue;
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}
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// Other searches do not, so we store the length.
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matchesWithLength.push({
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match: matchIdx,
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matchLength: subqueryLen,
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skipped: false,
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});
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}
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}
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// Prepare arrays for storing the matches.
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this._pageMatchesLength[pageIndex] = [];
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this._pageMatches[pageIndex] = [];
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// Sort `matchesWithLength`, remove intersecting terms and put the result
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// into the two arrays.
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this._prepareMatches(matchesWithLength, this._pageMatches[pageIndex],
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this._pageMatchesLength[pageIndex]);
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}
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_calculateMatch(pageIndex) {
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let pageContent = this._pageContents[pageIndex];
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let query = this._query;
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const { caseSensitive, entireWord, phraseSearch, } = this._state;
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if (query.length === 0) {
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// Do nothing: the matches should be wiped out already.
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return;
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}
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if (!caseSensitive) {
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pageContent = pageContent.toLowerCase();
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query = query.toLowerCase();
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}
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if (phraseSearch) {
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this._calculatePhraseMatch(query, pageIndex, pageContent, entireWord);
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} else {
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this._calculateWordMatch(query, pageIndex, pageContent, entireWord);
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}
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// When `highlightAll` is set, ensure that the matches on previously
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// rendered (and still active) pages are correctly highlighted.
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if (this._state.highlightAll) {
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this._updatePage(pageIndex);
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}
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if (this._resumePageIdx === pageIndex) {
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this._resumePageIdx = null;
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this._nextPageMatch();
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}
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// Update the match count.
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const pageMatchesCount = this._pageMatches[pageIndex].length;
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if (pageMatchesCount > 0) {
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this._matchesCountTotal += pageMatchesCount;
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this._updateUIResultsCount();
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}
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}
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_extractText() {
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// Perform text extraction once if this method is called multiple times.
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if (this._extractTextPromises.length > 0) {
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return;
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}
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let promise = Promise.resolve();
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for (let i = 0, ii = this._linkService.pagesCount; i < ii; i++) {
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const extractTextCapability = createPromiseCapability();
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this._extractTextPromises[i] = extractTextCapability.promise;
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promise = promise.then(() => {
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return this._pdfDocument.getPage(i + 1).then((pdfPage) => {
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return pdfPage.getTextContent({
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normalizeWhitespace: true,
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});
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}).then((textContent) => {
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const textItems = textContent.items;
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const strBuf = [];
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for (let j = 0, jj = textItems.length; j < jj; j++) {
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strBuf.push(textItems[j].str);
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}
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// Store the normalized page content (text items) as one string.
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this._pageContents[i] = normalize(strBuf.join(''));
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extractTextCapability.resolve(i);
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}, (reason) => {
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console.error(`Unable to get text content for page ${i + 1}`, reason);
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// Page error -- assuming no text content.
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this._pageContents[i] = '';
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extractTextCapability.resolve(i);
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});
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});
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}
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}
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_updatePage(index) {
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if (this._scrollMatches && this._selected.pageIdx === index) {
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// If the page is selected, scroll the page into view, which triggers
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// rendering the page, which adds the text layer. Once the text layer
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// is built, it will attempt to scroll the selected match into view.
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this._linkService.page = index + 1;
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}
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this._eventBus.dispatch('updatetextlayermatches', {
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source: this,
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pageIndex: index,
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});
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}
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_updateAllPages() {
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this._eventBus.dispatch('updatetextlayermatches', {
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source: this,
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pageIndex: -1,
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});
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}
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_nextMatch() {
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const previous = this._state.findPrevious;
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const currentPageIndex = this._linkService.page - 1;
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const numPages = this._linkService.pagesCount;
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this._highlightMatches = true;
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if (this._dirtyMatch) {
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// Need to recalculate the matches, reset everything.
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this._dirtyMatch = false;
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this._selected.pageIdx = this._selected.matchIdx = -1;
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this._offset.pageIdx = currentPageIndex;
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this._offset.matchIdx = null;
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this._offset.wrapped = false;
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this._resumePageIdx = null;
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this._pageMatches.length = 0;
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this._pageMatchesLength.length = 0;
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this._matchesCountTotal = 0;
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this._updateAllPages(); // Wipe out any previously highlighted matches.
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for (let i = 0; i < numPages; i++) {
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// Start finding the matches as soon as the text is extracted.
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if (this._pendingFindMatches[i] === true) {
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continue;
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}
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this._pendingFindMatches[i] = true;
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this._extractTextPromises[i].then((pageIdx) => {
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delete this._pendingFindMatches[pageIdx];
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this._calculateMatch(pageIdx);
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});
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}
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}
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// If there's no query there's no point in searching.
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if (this._query === '') {
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this._updateUIState(FindState.FOUND);
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return;
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}
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// If we're waiting on a page, we return since we can't do anything else.
|
|
if (this._resumePageIdx) {
|
|
return;
|
|
}
|
|
|
|
const offset = this._offset;
|
|
// Keep track of how many pages we should maximally iterate through.
|
|
this._pagesToSearch = numPages;
|
|
// If there's already a `matchIdx` that means we are iterating through a
|
|
// page's matches.
|
|
if (offset.matchIdx !== null) {
|
|
const numPageMatches = this._pageMatches[offset.pageIdx].length;
|
|
if ((!previous && offset.matchIdx + 1 < numPageMatches) ||
|
|
(previous && offset.matchIdx > 0)) {
|
|
// The simple case; we just have advance the matchIdx to select
|
|
// the next match on the page.
|
|
offset.matchIdx = (previous ? offset.matchIdx - 1 :
|
|
offset.matchIdx + 1);
|
|
this._updateMatch(/* found = */ true);
|
|
return;
|
|
}
|
|
// We went beyond the current page's matches, so we advance to
|
|
// the next page.
|
|
this._advanceOffsetPage(previous);
|
|
}
|
|
// Start searching through the page.
|
|
this._nextPageMatch();
|
|
}
|
|
|
|
_matchesReady(matches) {
|
|
const offset = this._offset;
|
|
const numMatches = matches.length;
|
|
const previous = this._state.findPrevious;
|
|
|
|
if (numMatches) {
|
|
// There were matches for the page, so initialize `matchIdx`.
|
|
offset.matchIdx = (previous ? numMatches - 1 : 0);
|
|
this._updateMatch(/* found = */ true);
|
|
return true;
|
|
}
|
|
// No matches, so attempt to search the next page.
|
|
this._advanceOffsetPage(previous);
|
|
if (offset.wrapped) {
|
|
offset.matchIdx = null;
|
|
if (this._pagesToSearch < 0) {
|
|
// No point in wrapping again, there were no matches.
|
|
this._updateMatch(/* found = */ false);
|
|
// While matches were not found, searching for a page
|
|
// with matches should nevertheless halt.
|
|
return true;
|
|
}
|
|
}
|
|
// Matches were not found (and searching is not done).
|
|
return false;
|
|
}
|
|
|
|
_nextPageMatch() {
|
|
if (this._resumePageIdx !== null) {
|
|
console.error('There can only be one pending page.');
|
|
}
|
|
|
|
let matches = null;
|
|
do {
|
|
const pageIdx = this._offset.pageIdx;
|
|
matches = this._pageMatches[pageIdx];
|
|
if (!matches) {
|
|
// The matches don't exist yet for processing by `_matchesReady`,
|
|
// so set a resume point for when they do exist.
|
|
this._resumePageIdx = pageIdx;
|
|
break;
|
|
}
|
|
} while (!this._matchesReady(matches));
|
|
}
|
|
|
|
_advanceOffsetPage(previous) {
|
|
const offset = this._offset;
|
|
const numPages = this._linkService.pagesCount;
|
|
offset.pageIdx = (previous ? offset.pageIdx - 1 : offset.pageIdx + 1);
|
|
offset.matchIdx = null;
|
|
|
|
this._pagesToSearch--;
|
|
|
|
if (offset.pageIdx >= numPages || offset.pageIdx < 0) {
|
|
offset.pageIdx = (previous ? numPages - 1 : 0);
|
|
offset.wrapped = true;
|
|
}
|
|
}
|
|
|
|
_updateMatch(found = false) {
|
|
let state = FindState.NOT_FOUND;
|
|
const wrapped = this._offset.wrapped;
|
|
this._offset.wrapped = false;
|
|
|
|
if (found) {
|
|
const previousPage = this._selected.pageIdx;
|
|
this._selected.pageIdx = this._offset.pageIdx;
|
|
this._selected.matchIdx = this._offset.matchIdx;
|
|
state = (wrapped ? FindState.WRAPPED : FindState.FOUND);
|
|
|
|
// Update the currently selected page to wipe out any selected matches.
|
|
if (previousPage !== -1 && previousPage !== this._selected.pageIdx) {
|
|
this._updatePage(previousPage);
|
|
}
|
|
}
|
|
|
|
this._updateUIState(state, this._state.findPrevious);
|
|
if (this._selected.pageIdx !== -1) {
|
|
// Ensure that the match will be scrolled into view.
|
|
this._scrollMatches = true;
|
|
|
|
this._updatePage(this._selected.pageIdx);
|
|
}
|
|
}
|
|
|
|
_onFindBarClose(evt) {
|
|
const pdfDocument = this._pdfDocument;
|
|
// Since searching is asynchronous, ensure that the removal of highlighted
|
|
// matches (from the UI) is async too such that the 'updatetextlayermatches'
|
|
// events will always be dispatched in the expected order.
|
|
this._firstPageCapability.promise.then(() => {
|
|
// Only update the UI if the document is open, and is the current one.
|
|
if (!this._pdfDocument ||
|
|
(pdfDocument && this._pdfDocument !== pdfDocument)) {
|
|
return;
|
|
}
|
|
// Ensure that a pending, not yet started, search operation is aborted.
|
|
if (this._findTimeout) {
|
|
clearTimeout(this._findTimeout);
|
|
this._findTimeout = null;
|
|
}
|
|
// Abort any long running searches, to avoid a match being scrolled into
|
|
// view *after* the findbar has been closed. In this case `this._offset`
|
|
// will most likely differ from `this._selected`, hence we also ensure
|
|
// that any new search operation will always start with a clean slate.
|
|
if (this._resumePageIdx) {
|
|
this._resumePageIdx = null;
|
|
this._dirtyMatch = true;
|
|
}
|
|
// Avoid the UI being in a pending state when the findbar is re-opened.
|
|
this._updateUIState(FindState.FOUND);
|
|
|
|
this._highlightMatches = false;
|
|
this._updateAllPages(); // Wipe out any previously highlighted matches.
|
|
});
|
|
}
|
|
|
|
_requestMatchesCount() {
|
|
const { pageIdx, matchIdx, } = this._selected;
|
|
let current = 0, total = this._matchesCountTotal;
|
|
if (matchIdx !== -1) {
|
|
for (let i = 0; i < pageIdx; i++) {
|
|
current += (this._pageMatches[i] && this._pageMatches[i].length) || 0;
|
|
}
|
|
current += matchIdx + 1;
|
|
}
|
|
// When searching starts, this method may be called before the `pageMatches`
|
|
// have been counted (in `_calculateMatch`). Ensure that the UI won't show
|
|
// temporarily broken state when the active find result doesn't make sense.
|
|
if (current < 1 || current > total) {
|
|
current = total = 0;
|
|
}
|
|
return { current, total, };
|
|
}
|
|
|
|
_updateUIResultsCount() {
|
|
this._eventBus.dispatch('updatefindmatchescount', {
|
|
source: this,
|
|
matchesCount: this._requestMatchesCount(),
|
|
});
|
|
}
|
|
|
|
_updateUIState(state, previous) {
|
|
this._eventBus.dispatch('updatefindcontrolstate', {
|
|
source: this,
|
|
state,
|
|
previous,
|
|
matchesCount: this._requestMatchesCount(),
|
|
});
|
|
}
|
|
}
|
|
|
|
export {
|
|
FindState,
|
|
PDFFindController,
|
|
};
|