499 lines
13 KiB
JavaScript
499 lines
13 KiB
JavaScript
var activeImageViewer = null;
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class ImageViewer {
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constructor(img) {
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this.img = img;
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this.loadingInterval = null;
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this.activityIndicator = "data:image/svg+xml;base64,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";
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}
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isLoaded() {
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return this.img.classList.contains("nnwLoaded");
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}
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clicked() {
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this.showLoadingIndicator();
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if (this.isLoaded()) {
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this.showViewer();
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} else {
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var callback = () => {
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if (this.isLoaded()) {
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clearInterval(this.loadingInterval);
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this.showViewer();
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}
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}
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this.loadingInterval = setInterval(callback, 100);
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}
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}
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cancel() {
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clearInterval(this.loadingInterval);
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this.hideLoadingIndicator();
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}
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showViewer() {
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this.hideLoadingIndicator();
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var canvas = document.createElement("canvas");
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var pixelRatio = window.devicePixelRatio;
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do {
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canvas.width = this.img.naturalWidth * pixelRatio;
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canvas.height = this.img.naturalHeight * pixelRatio;
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pixelRatio--;
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} while (pixelRatio > 0 && canvas.width * canvas.height > 16777216)
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canvas.getContext("2d").drawImage(this.img, 0, 0, canvas.width, canvas.height);
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const rect = this.img.getBoundingClientRect();
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const message = {
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x: rect.x,
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y: rect.y,
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width: rect.width,
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height: rect.height,
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imageTitle: this.img.title,
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imageURL: canvas.toDataURL(),
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};
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var jsonMessage = JSON.stringify(message);
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window.webkit.messageHandlers.imageWasClicked.postMessage(jsonMessage);
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}
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hideImage() {
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this.img.style.opacity = 0;
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}
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showImage() {
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this.img.style.opacity = 1
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}
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showLoadingIndicator() {
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var wrapper = document.createElement("div");
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wrapper.classList.add("activityIndicatorWrap");
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this.img.parentNode.insertBefore(wrapper, this.img);
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wrapper.appendChild(this.img);
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var activityIndicatorImg = document.createElement("img");
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activityIndicatorImg.classList.add("activityIndicator");
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activityIndicatorImg.style.opacity = 0;
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activityIndicatorImg.src = this.activityIndicator;
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wrapper.appendChild(activityIndicatorImg);
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activityIndicatorImg.style.opacity = 1;
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}
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hideLoadingIndicator() {
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var wrapper = this.img.parentNode;
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if (wrapper.classList.contains("activityIndicatorWrap")) {
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var wrapperParent = wrapper.parentNode;
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wrapperParent.insertBefore(this.img, wrapper);
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wrapperParent.removeChild(wrapper);
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}
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}
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static init() {
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cancelImageLoad();
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// keep track of when an image has finished downloading for ImageViewer
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document.querySelectorAll("img").forEach(element => {
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element.onload = function() {
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this.classList.add("nnwLoaded");
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}
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});
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// Add the click listener for images
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window.onclick = function(event) {
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if (event.target.matches("img") && !event.target.classList.contains("nnw-nozoom")) {
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if (activeImageViewer && activeImageViewer.img === event.target) {
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cancelImageLoad();
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} else {
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cancelImageLoad();
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activeImageViewer = new ImageViewer(event.target);
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activeImageViewer.clicked();
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}
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}
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}
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}
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}
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function cancelImageLoad() {
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if (activeImageViewer) {
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activeImageViewer.cancel();
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activeImageViewer = null;
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}
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}
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function hideClickedImage() {
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if (activeImageViewer) {
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activeImageViewer.hideImage();
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}
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}
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// Used to animate the transition from a fullscreen image
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function showClickedImage() {
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if (activeImageViewer) {
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activeImageViewer.showImage();
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}
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window.webkit.messageHandlers.imageWasShown.postMessage("");
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}
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function showFeedInspectorSetup() {
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document.getElementById("nnwImageIcon").onclick = function(event) {
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window.webkit.messageHandlers.showFeedInspector.postMessage("");
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}
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}
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function linkHover() {
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window.onmouseover = function(event) {
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var closestAnchor = event.target.closest('a')
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if (closestAnchor) {
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window.webkit.messageHandlers.mouseDidEnter.postMessage(closestAnchor.href);
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}
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}
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window.onmouseout = function(event) {
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var closestAnchor = event.target.closest('a')
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if (closestAnchor) {
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window.webkit.messageHandlers.mouseDidExit.postMessage(closestAnchor.href);
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}
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}
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}
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function postRenderProcessing() {
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ImageViewer.init();
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showFeedInspectorSetup();
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linkHover();
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}
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function makeHighlightRect({left, top, width, height}, offsetTop=0, offsetLeft=0) {
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const overlay = document.createElement('a');
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Object.assign(overlay.style, {
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position: 'absolute',
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left: `${Math.floor(left + offsetLeft)}px`,
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top: `${Math.floor(top + offsetTop)}px`,
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width: `${Math.ceil(width)}px`,
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height: `${Math.ceil(height)}px`,
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backgroundColor: 'rgba(200, 220, 10, 0.4)',
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pointerEvents: 'none'
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});
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return overlay;
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}
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function clearHighlightRects() {
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let container = document.getElementById('nnw:highlightContainer')
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if (container) container.remove();
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}
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function highlightRects(rects, clearOldRects=true, makeHighlightRect=makeHighlightRect) {
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const article = document.querySelector('article');
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let container = document.getElementById('nnw:highlightContainer');
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article.style.position = 'relative';
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if (container && clearOldRects)
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container.remove();
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container = document.createElement('div');
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container.id = 'nnw:highlightContainer';
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article.appendChild(container);
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const {top, left} = article.getBoundingClientRect();
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return Array.from(rects, rect =>
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container.appendChild(makeHighlightRect(rect, -top, -left))
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);
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}
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FinderResult = class {
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constructor(result) {
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Object.assign(this, result);
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}
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range() {
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const range = document.createRange();
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range.setStart(this.node, this.offset);
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range.setEnd(this.node, this.offsetEnd);
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return range;
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}
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bounds() {
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return this.range().getBoundingClientRect();
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}
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rects() {
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return this.range().getClientRects();
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}
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highlight({clearOldRects=true, fn=makeHighlightRect} = {}) {
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highlightRects(this.rects(), clearOldRects, fn);
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}
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scrollTo() {
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scrollToRect(this.bounds(), this.node);
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}
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toJSON() {
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return {
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rects: Array.from(this.rects()),
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bounds: this.bounds(),
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index: this.index,
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matchGroups: this.match
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};
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}
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toJSONString() {
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return JSON.stringify(this.toJSON());
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}
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}
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Finder = class {
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constructor(pattern, options) {
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if (!pattern.global) {
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pattern = new RegExp(pattern, 'g');
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}
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this.pattern = pattern;
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this.lastResult = null;
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this._nodeMatches = [];
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this.options = {
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rootSelector: '.articleBody',
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startNode: null,
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startOffset: null,
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}
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this.resultIndex = -1
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Object.assign(this.options, options);
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this.walker = document.createTreeWalker(this.root, NodeFilter.SHOW_TEXT);
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}
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get root() {
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return document.querySelector(this.options.rootSelector)
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}
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get count() {
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const node = this.walker.currentNode;
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const index = this.resultIndex;
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this.reset();
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let result, count = 0;
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while ((result = this.next())) ++count;
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this.resultIndex = index;
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this.walker.currentNode = node;
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return count;
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}
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reset() {
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this.walker.currentNode = this.options.startNode || this.root;
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this.resultIndex = -1;
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}
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[Symbol.iterator]() {
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return this;
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}
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next({wrap = false} = {}) {
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const { startNode } = this.options;
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const { pattern, walker } = this;
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let { node, matchIndex = -1 } = this.lastResult || { node: startNode };
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while (true) {
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if (!node)
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node = walker.nextNode();
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if (!node) {
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if (!wrap || this.resultIndex < 0) break;
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this.reset();
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continue;
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}
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let nextIndex = matchIndex + 1;
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let matches = this._nodeMatches;
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if (!matches.length) {
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matches = Array.from(node.textContent.matchAll(pattern));
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nextIndex = 0;
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}
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if (matches[nextIndex]) {
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this._nodeMatches = matches;
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const m = matches[nextIndex];
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this.lastResult = new FinderResult({
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node,
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offset: m.index,
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offsetEnd: m.index + m[0].length,
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text: m[0],
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match: m,
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matchIndex: nextIndex,
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index: ++this.resultIndex,
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});
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return { value: this.lastResult, done: false };
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}
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this._nodeMatches = [];
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node = null;
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}
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return { value: undefined, done: true };
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}
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/// TODO Call when the search text changes
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retry() {
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if (this.lastResult) {
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this.lastResult.offsetEnd = this.lastResult.offset;
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}
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}
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toJSON() {
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const results = Array.from(this);
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}
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}
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function scrollParent(node) {
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let elt = node.nodeType === Node.ELEMENT_NODE ? node : node.parentElement;
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while (elt) {
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if (elt.scrollHeight > elt.clientHeight)
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return elt;
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elt = elt.parentElement;
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}
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}
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function scrollToRect({top, height}, node, pad=20, padBottom=60) {
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const scrollToTop = top - pad;
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let scrollBy = scrollToTop;
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if (scrollToTop >= 0) {
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const visible = window.visualViewport;
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const scrollToBottom = top + height + padBottom - visible.height;
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// The top of the rect is already in the viewport
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if (scrollToBottom <= 0 || scrollToTop === 0)
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// Don't need to scroll up--or can't
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return;
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scrollBy = Math.min(scrollToBottom, scrollBy);
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}
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scrollParent(node).scrollBy({ top: scrollBy });
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}
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function withEncodedArg(fn) {
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return function(encodedData, ...rest) {
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const data = encodedData && JSON.parse(atob(encodedData));
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return fn(data, ...rest);
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}
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}
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function escapeRegex(s) {
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return s.replace(/[.?*+^$\\()[\]{}]/g, '\\$&');
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}
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class FindState {
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constructor(options) {
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let { text, caseSensitive, regex } = options;
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if (!regex)
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text = escapeRegex(text);
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const finder = new Finder(new RegExp(text, caseSensitive ? 'g' : 'ig'));
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this.results = Array.from(finder);
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this.index = -1;
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this.options = options;
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}
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get selected() {
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return this.index > -1 ? this.results[this.index] : null;
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}
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toJSON() {
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return {
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index: this.index > -1 ? this.index : null,
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results: this.results,
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count: this.results.length
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};
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}
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selectNext(step=1) {
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const index = this.index + step;
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const result = this.results[index];
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if (result) {
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this.index = index;
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result.highlight();
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result.scrollTo();
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}
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return result;
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}
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selectPrevious() {
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return this.selectNext(-1);
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}
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}
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CurrentFindState = null;
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const ExcludeKeys = new Set(['top', 'right', 'bottom', 'left']);
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updateFind = withEncodedArg(options => {
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// TODO Start at the current result position
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// TODO Introduce slight delay, cap the number of results, and report results asynchronously
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let newFindState;
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if (!options || !options.text) {
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clearHighlightRects();
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return
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}
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try {
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newFindState = new FindState(options);
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} catch (err) {
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clearHighlightRects();
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throw err;
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}
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if (newFindState.results.length) {
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let selected = CurrentFindState && CurrentFindState.selected;
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let selectIndex = 0;
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if (selected) {
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let {node: currentNode, offset: currentOffset} = selected;
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selectIndex = newFindState.results.findIndex(r => {
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if (r.node === currentNode) {
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return r.offset >= currentOffset;
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}
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let relation = currentNode.compareDocumentPosition(r.node);
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return Boolean(relation & Node.DOCUMENT_POSITION_FOLLOWING);
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});
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}
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newFindState.selectNext(selectIndex+1);
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} else {
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clearHighlightRects();
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}
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CurrentFindState = newFindState;
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return btoa(JSON.stringify(CurrentFindState, (k, v) => (ExcludeKeys.has(k) ? undefined : v)));
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});
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selectNextResult = withEncodedArg(options => {
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if (CurrentFindState)
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CurrentFindState.selectNext();
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});
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selectPreviousResult = withEncodedArg(options => {
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if (CurrentFindState)
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CurrentFindState.selectPrevious();
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});
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function endFind() {
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clearHighlightRects()
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CurrentFindState = null;
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}
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