yomichan/ext/js/app/frontend.js
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JavaScript

/*
* Copyright (C) 2016-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/* global
* DocumentUtil
* TextScanner
* TextSourceRange
*/
/**
* This is the main class responsible for scanning and handling webpage content.
*/
class Frontend {
/**
* Creates a new instance.
* @param {object} details
* @param {string} details.pageType The type of page, one of 'web', 'popup', or 'search'.
* @param {PopupFactory} details.popupFactory A PopupFactory instance to use for generating popups.
* @param {number} details.depth The nesting depth value of the popup.
* @param {number} details.tabId The tab ID of the host tab.
* @param {number} details.frameId The frame ID of the host frame.
* @param {?string} details.parentPopupId The popup ID of the parent popup if one exists, otherwise null.
* @param {?number} details.parentFrameId The frame ID of the parent popup if one exists, otherwise null.
* @param {boolean} details.useProxyPopup Whether or not proxy popups should be used.
* @param {boolean} details.canUseWindowPopup Whether or not window popups can be used.
* @param {boolean} details.allowRootFramePopupProxy Whether or not popups can be hosted in the root frame.
* @param {boolean} details.childrenSupported Whether popups can create child popups or not.
* @param {HotkeyHandler} details.hotkeyHandler A HotkeyHandler instance.
*/
constructor({
pageType,
popupFactory,
depth,
tabId,
frameId,
parentPopupId,
parentFrameId,
useProxyPopup,
canUseWindowPopup=true,
allowRootFramePopupProxy,
childrenSupported=true,
hotkeyHandler
}) {
this._pageType = pageType;
this._popupFactory = popupFactory;
this._depth = depth;
this._tabId = tabId;
this._frameId = frameId;
this._parentPopupId = parentPopupId;
this._parentFrameId = parentFrameId;
this._useProxyPopup = useProxyPopup;
this._canUseWindowPopup = canUseWindowPopup;
this._allowRootFramePopupProxy = allowRootFramePopupProxy;
this._childrenSupported = childrenSupported;
this._hotkeyHandler = hotkeyHandler;
this._popup = null;
this._disabledOverride = false;
this._options = null;
this._pageZoomFactor = 1.0;
this._contentScale = 1.0;
this._lastShowPromise = Promise.resolve();
this._documentUtil = new DocumentUtil();
this._textScanner = new TextScanner({
node: window,
ignoreElements: this._ignoreElements.bind(this),
ignorePoint: this._ignorePoint.bind(this),
getSearchContext: this._getSearchContext.bind(this),
documentUtil: this._documentUtil,
searchTerms: true,
searchKanji: true
});
this._textScannerHasBeenEnabled = false;
this._popupCache = new Map();
this._popupEventListeners = new EventListenerCollection();
this._updatePopupToken = null;
this._clearSelectionTimer = null;
this._isPointerOverPopup = false;
this._optionsContextOverride = null;
this._runtimeMessageHandlers = new Map([
['Frontend.requestReadyBroadcast', {async: false, handler: this._onMessageRequestFrontendReadyBroadcast.bind(this)}],
['Frontend.setAllVisibleOverride', {async: true, handler: this._onApiSetAllVisibleOverride.bind(this)}],
['Frontend.clearAllVisibleOverride', {async: true, handler: this._onApiClearAllVisibleOverride.bind(this)}]
]);
this._hotkeyHandler.registerActions([
['scanSelectedText', this._onActionScanSelectedText.bind(this)],
['scanTextAtCaret', this._onActionScanTextAtCaret.bind(this)]
]);
}
/**
* Get whether or not the text selection can be cleared.
* @type {boolean}
*/
get canClearSelection() {
return this._textScanner.canClearSelection;
}
/**
* Set whether or not the text selection can be cleared.
* @param {boolean} value The new value to assign.
*/
set canClearSelection(value) {
this._textScanner.canClearSelection = value;
}
/**
* Gets the popup instance.
* @type {Popup}
*/
get popup() {
return this._popup;
}
/**
* Prepares the instance for use.
*/
async prepare() {
await this.updateOptions();
try {
const {zoomFactor} = await yomichan.api.getZoom();
this._pageZoomFactor = zoomFactor;
} catch (e) {
// Ignore exceptions which may occur due to being on an unsupported page (e.g. about:blank)
}
this._textScanner.prepare();
window.addEventListener('resize', this._onResize.bind(this), false);
DocumentUtil.addFullscreenChangeEventListener(this._updatePopup.bind(this));
const visualViewport = window.visualViewport;
if (visualViewport !== null && typeof visualViewport === 'object') {
visualViewport.addEventListener('scroll', this._onVisualViewportScroll.bind(this));
visualViewport.addEventListener('resize', this._onVisualViewportResize.bind(this));
}
yomichan.on('optionsUpdated', this.updateOptions.bind(this));
yomichan.on('zoomChanged', this._onZoomChanged.bind(this));
yomichan.on('closePopups', this._onClosePopups.bind(this));
chrome.runtime.onMessage.addListener(this._onRuntimeMessage.bind(this));
this._textScanner.on('clear', this._onTextScannerClear.bind(this));
this._textScanner.on('searched', this._onSearched.bind(this));
yomichan.crossFrame.registerHandlers([
['Frontend.closePopup', {async: false, handler: this._onApiClosePopup.bind(this)}],
['Frontend.copySelection', {async: false, handler: this._onApiCopySelection.bind(this)}],
['Frontend.getSelectionText', {async: false, handler: this._onApiGetSelectionText.bind(this)}],
['Frontend.getPopupInfo', {async: false, handler: this._onApiGetPopupInfo.bind(this)}],
['Frontend.getPageInfo', {async: false, handler: this._onApiGetPageInfo.bind(this)}]
]);
this._updateContentScale();
this._signalFrontendReady();
}
/**
* Set whether or not the instance is disabled.
* @param {boolean} disabled Whether or not the instance is disabled.
*/
setDisabledOverride(disabled) {
this._disabledOverride = disabled;
this._updateTextScannerEnabled();
}
/**
* Set or clear an override options context object.
* @param {?object} optionsContext An options context object to use as the override, or `null` to clear the override.
*/
setOptionsContextOverride(optionsContext) {
this._optionsContextOverride = optionsContext;
}
/**
* Performs a new search on a specific source.
* @param {TextSourceRange|TextSourceElement} textSource The text source to search.
*/
async setTextSource(textSource) {
this._textScanner.setCurrentTextSource(null);
await this._textScanner.search(textSource);
}
/**
* Updates the internal options representation.
*/
async updateOptions() {
try {
await this._updateOptionsInternal();
} catch (e) {
if (!yomichan.isExtensionUnloaded) {
throw e;
}
}
}
/**
* Waits for the previous `showContent` call to be completed.
* @returns {Promise} A promise which is resolved when the previous `showContent` call has completed.
*/
showContentCompleted() {
return this._lastShowPromise;
}
// Message handlers
_onMessageRequestFrontendReadyBroadcast({frameId}) {
this._signalFrontendReady(frameId);
}
// Action handlers
_onActionScanSelectedText() {
this._scanSelectedText(false);
}
_onActionScanTextAtCaret() {
this._scanSelectedText(true);
}
// API message handlers
_onApiGetUrl() {
return window.location.href;
}
_onApiClosePopup() {
this._clearSelection(false);
}
_onApiCopySelection() {
// This will not work on Firefox if a popup has focus, which is usually the case when this function is called.
document.execCommand('copy');
}
_onApiGetSelectionText() {
return document.getSelection().toString();
}
_onApiGetPopupInfo() {
return {
popupId: (this._popup !== null ? this._popup.id : null)
};
}
_onApiGetPageInfo() {
return {
url: window.location.href,
documentTitle: document.title
};
}
async _onApiSetAllVisibleOverride({value, priority, awaitFrame}) {
const result = await this._popupFactory.setAllVisibleOverride(value, priority);
if (awaitFrame) {
await promiseAnimationFrame(100);
}
return result;
}
async _onApiClearAllVisibleOverride({token}) {
return await this._popupFactory.clearAllVisibleOverride(token);
}
// Private
_onResize() {
this._updatePopupPosition();
}
_onRuntimeMessage({action, params}, sender, callback) {
const messageHandler = this._runtimeMessageHandlers.get(action);
if (typeof messageHandler === 'undefined') { return false; }
return invokeMessageHandler(messageHandler, params, callback, sender);
}
_onZoomChanged({newZoomFactor}) {
this._pageZoomFactor = newZoomFactor;
this._updateContentScale();
}
_onClosePopups() {
this._clearSelection(true);
}
_onVisualViewportScroll() {
this._updatePopupPosition();
}
_onVisualViewportResize() {
this._updateContentScale();
}
_onTextScannerClear() {
this._clearSelection(false);
}
_onSearched({type, dictionaryEntries, sentence, inputInfo: {eventType, passive, detail}, textSource, optionsContext, detail: {documentTitle}, error}) {
const scanningOptions = this._options.scanning;
if (error !== null) {
if (yomichan.isExtensionUnloaded) {
if (textSource !== null && !passive) {
this._showExtensionUnloaded(textSource);
}
} else {
log.error(error);
}
} if (type !== null) {
this._stopClearSelectionDelayed();
let focus = (eventType === 'mouseMove');
if (isObject(detail)) {
const focus2 = detail.focus;
if (typeof focus2 === 'boolean') { focus = focus2; }
}
this._showContent(textSource, focus, dictionaryEntries, type, sentence, documentTitle, optionsContext);
} else {
if (scanningOptions.autoHideResults) {
this._clearSelectionDelayed(scanningOptions.hideDelay, false);
}
}
}
_onPopupFramePointerOver() {
this._isPointerOverPopup = true;
this._stopClearSelectionDelayed();
}
_onPopupFramePointerOut() {
this._isPointerOverPopup = false;
}
_clearSelection(passive) {
this._stopClearSelectionDelayed();
if (this._popup !== null) {
this._popup.clearAutoPlayTimer();
this._popup.hide(!passive);
this._isPointerOverPopup = false;
}
this._textScanner.clearSelection();
}
_clearSelectionDelayed(delay, restart, passive) {
if (!this._textScanner.hasSelection()) { return; }
if (delay > 0) {
if (this._clearSelectionTimer !== null && !restart) { return; } // Already running
this._stopClearSelectionDelayed();
this._clearSelectionTimer = setTimeout(() => {
this._clearSelectionTimer = null;
if (this._isPointerOverPopup) { return; }
this._clearSelection(passive);
}, delay);
} else {
this._clearSelection(passive);
}
}
_stopClearSelectionDelayed() {
if (this._clearSelectionTimer !== null) {
clearTimeout(this._clearSelectionTimer);
this._clearSelectionTimer = null;
}
}
async _updateOptionsInternal() {
const optionsContext = await this._getOptionsContext();
const options = await yomichan.api.optionsGet(optionsContext);
const {scanning: scanningOptions, sentenceParsing: sentenceParsingOptions} = options;
this._options = options;
this._hotkeyHandler.setHotkeys('web', options.inputs.hotkeys);
await this._updatePopup();
const preventMiddleMouse = this._getPreventMiddleMouseValueForPageType(scanningOptions.preventMiddleMouse);
this._textScanner.setOptions({
inputs: scanningOptions.inputs,
deepContentScan: scanningOptions.deepDomScan,
selectText: scanningOptions.selectText,
delay: scanningOptions.delay,
touchInputEnabled: scanningOptions.touchInputEnabled,
pointerEventsEnabled: scanningOptions.pointerEventsEnabled,
scanLength: scanningOptions.length,
layoutAwareScan: scanningOptions.layoutAwareScan,
matchTypePrefix: scanningOptions.matchTypePrefix,
preventMiddleMouse,
sentenceParsingOptions
});
this._updateTextScannerEnabled();
if (this._pageType !== 'web') {
const excludeSelectors = ['.scan-disable', '.scan-disable *'];
if (!scanningOptions.enableOnPopupExpressions) {
excludeSelectors.push('.source-text', '.source-text *');
}
this._textScanner.excludeSelector = excludeSelectors.join(',');
}
this._updateContentScale();
await this._textScanner.searchLast();
}
async _updatePopup() {
const {usePopupWindow, showIframePopupsInRootFrame} = this._options.general;
const isIframe = !this._useProxyPopup && (window !== window.parent);
const currentPopup = this._popup;
let popupPromise;
if (usePopupWindow && this._canUseWindowPopup) {
popupPromise = this._popupCache.get('window');
if (typeof popupPromise === 'undefined') {
popupPromise = this._getPopupWindow();
this._popupCache.set('window', popupPromise);
}
} else if (
isIframe &&
showIframePopupsInRootFrame &&
DocumentUtil.getFullscreenElement() === null &&
this._allowRootFramePopupProxy
) {
popupPromise = this._popupCache.get('iframe');
if (typeof popupPromise === 'undefined') {
popupPromise = this._getIframeProxyPopup();
this._popupCache.set('iframe', popupPromise);
}
} else if (this._useProxyPopup) {
popupPromise = this._popupCache.get('proxy');
if (typeof popupPromise === 'undefined') {
popupPromise = this._getProxyPopup();
this._popupCache.set('proxy', popupPromise);
}
} else {
popupPromise = this._popupCache.get('default');
if (typeof popupPromise === 'undefined') {
popupPromise = this._getDefaultPopup();
this._popupCache.set('default', popupPromise);
}
}
// The token below is used as a unique identifier to ensure that a new _updatePopup call
// hasn't been started during the await.
const token = {};
this._updatePopupToken = token;
const popup = await popupPromise;
const optionsContext = await this._getOptionsContext();
if (this._updatePopupToken !== token) { return; }
if (popup !== null) {
await popup.setOptionsContext(optionsContext);
}
if (this._updatePopupToken !== token) { return; }
if (popup !== currentPopup) {
this._clearSelection(true);
}
this._popupEventListeners.removeAllEventListeners();
this._popup = popup;
if (popup !== null) {
this._popupEventListeners.on(popup, 'framePointerOver', this._onPopupFramePointerOver.bind(this));
this._popupEventListeners.on(popup, 'framePointerOut', this._onPopupFramePointerOut.bind(this));
}
this._isPointerOverPopup = false;
}
async _getDefaultPopup() {
const isXmlDocument = (typeof XMLDocument !== 'undefined' && document instanceof XMLDocument);
if (isXmlDocument) {
return null;
}
return await this._popupFactory.getOrCreatePopup({
frameId: this._frameId,
depth: this._depth,
childrenSupported: this._childrenSupported
});
}
async _getProxyPopup() {
return await this._popupFactory.getOrCreatePopup({
frameId: this._parentFrameId,
depth: this._depth,
parentPopupId: this._parentPopupId,
childrenSupported: this._childrenSupported
});
}
async _getIframeProxyPopup() {
const targetFrameId = 0; // Root frameId
try {
await this._waitForFrontendReady(targetFrameId, 10000);
} catch (e) {
// Root frame not available
return await this._getDefaultPopup();
}
const {popupId} = await yomichan.crossFrame.invoke(targetFrameId, 'Frontend.getPopupInfo');
if (popupId === null) {
return null;
}
const popup = await this._popupFactory.getOrCreatePopup({
frameId: targetFrameId,
id: popupId,
childrenSupported: this._childrenSupported
});
popup.on('offsetNotFound', () => {
this._allowRootFramePopupProxy = false;
this._updatePopup();
});
return popup;
}
async _getPopupWindow() {
return await this._popupFactory.getOrCreatePopup({
depth: this._depth,
popupWindow: true,
childrenSupported: this._childrenSupported
});
}
_ignoreElements() {
if (this._popup !== null) {
const container = this._popup.container;
if (container !== null) {
return [container];
}
}
return [];
}
async _ignorePoint(x, y) {
try {
return this._popup !== null && await this._popup.containsPoint(x, y);
} catch (e) {
if (!yomichan.isExtensionUnloaded) {
throw e;
}
return false;
}
}
_showExtensionUnloaded(textSource) {
if (textSource === null) {
textSource = this._textScanner.getCurrentTextSource();
if (textSource === null) { return; }
}
this._showPopupContent(textSource, null);
}
_showContent(textSource, focus, dictionaryEntries, type, sentence, documentTitle, optionsContext) {
const query = textSource.text();
const {url} = optionsContext;
const details = {
focus,
historyMode: 'clear',
params: {
type,
query,
wildcards: 'off'
},
state: {
focusEntry: 0,
optionsContext,
url,
sentence,
documentTitle
},
content: {
dictionaryEntries,
contentOrigin: {
tabId: this._tabId,
frameId: this._frameId
}
}
};
if (textSource.type === 'element' && textSource.fullContent !== query) {
details.params.full = textSource.fullContent;
details.params['full-visible'] = 'true';
}
this._showPopupContent(textSource, optionsContext, details);
}
_showPopupContent(textSource, optionsContext, details=null) {
const {left, top, width, height} = textSource.getRect();
this._lastShowPromise = (
this._popup !== null ?
this._popup.showContent(
{
optionsContext,
elementRect: {x: left, y: top, width, height, valid: true},
writingMode: textSource.getWritingMode()
},
details
) :
Promise.resolve()
);
this._lastShowPromise.catch((error) => {
if (yomichan.isExtensionUnloaded) { return; }
log.error(error);
});
return this._lastShowPromise;
}
_updateTextScannerEnabled() {
const enabled = (this._options !== null && this._options.general.enable && !this._disabledOverride);
if (enabled === this._textScanner.isEnabled()) { return; }
this._textScanner.setEnabled(enabled);
if (this._textScannerHasBeenEnabled) {
this._clearSelection(true);
}
if (enabled) {
this._textScannerHasBeenEnabled = true;
}
}
_updateContentScale() {
const {popupScalingFactor, popupScaleRelativeToPageZoom, popupScaleRelativeToVisualViewport} = this._options.general;
let contentScale = popupScalingFactor;
if (popupScaleRelativeToPageZoom) {
contentScale /= this._pageZoomFactor;
}
if (popupScaleRelativeToVisualViewport) {
const visualViewport = window.visualViewport;
const visualViewportScale = (visualViewport !== null && typeof visualViewport === 'object' ? visualViewport.scale : 1.0);
contentScale /= visualViewportScale;
}
if (contentScale === this._contentScale) { return; }
this._contentScale = contentScale;
if (this._popup !== null) {
this._popup.setContentScale(this._contentScale);
}
this._updatePopupPosition();
}
async _updatePopupPosition() {
const textSource = this._textScanner.getCurrentTextSource();
if (
textSource !== null &&
this._popup !== null &&
await this._popup.isVisible()
) {
this._showPopupContent(textSource, null);
}
}
_signalFrontendReady(targetFrameId=null) {
const params = {frameId: this._frameId};
if (targetFrameId === null) {
yomichan.api.broadcastTab('frontendReady', params);
} else {
yomichan.api.sendMessageToFrame(targetFrameId, 'frontendReady', params);
}
}
async _waitForFrontendReady(frameId, timeout) {
return new Promise((resolve, reject) => {
let timeoutId = null;
const cleanup = () => {
if (timeoutId !== null) {
clearTimeout(timeoutId);
timeoutId = null;
}
chrome.runtime.onMessage.removeListener(onMessage);
};
const onMessage = (message, sender, sendResponse) => {
try {
const {action, params} = message;
if (action === 'frontendReady' && params.frameId === frameId) {
cleanup();
resolve();
sendResponse();
}
} catch (e) {
// NOP
}
};
if (timeout !== null) {
timeoutId = setTimeout(() => {
timeoutId = null;
cleanup();
reject(new Error(`Wait for frontend ready timed out after ${timeout}ms`));
}, timeout);
}
chrome.runtime.onMessage.addListener(onMessage);
yomichan.api.broadcastTab('Frontend.requestReadyBroadcast', {frameId: this._frameId});
});
}
_getPreventMiddleMouseValueForPageType(preventMiddleMouseOptions) {
switch (this._pageType) {
case 'web': return preventMiddleMouseOptions.onWebPages;
case 'popup': return preventMiddleMouseOptions.onPopupPages;
case 'search': return preventMiddleMouseOptions.onSearchPages;
default: return false;
}
}
async _getOptionsContext() {
let optionsContext = this._optionsContextOverride;
if (optionsContext === null) {
optionsContext = (await this._getSearchContext()).optionsContext;
}
return optionsContext;
}
async _getSearchContext() {
let url = window.location.href;
let documentTitle = document.title;
if (this._useProxyPopup) {
try {
({url, documentTitle} = await yomichan.crossFrame.invoke(this._parentFrameId, 'Frontend.getPageInfo', {}));
} catch (e) {
// NOP
}
}
let optionsContext = this._optionsContextOverride;
if (optionsContext === null) {
optionsContext = {depth: this._depth, url};
}
return {
optionsContext,
detail: {documentTitle}
};
}
async _scanSelectedText(allowEmptyRange) {
const range = this._getFirstSelectionRange(allowEmptyRange);
if (range === null) { return false; }
const source = new TextSourceRange(range, range.toString(), null, null);
await this._textScanner.search(source, {focus: true, restoreSelection: true});
return true;
}
_getFirstSelectionRange(allowEmptyRange) {
const selection = window.getSelection();
for (let i = 0, ii = selection.rangeCount; i < ii; ++i) {
const range = selection.getRangeAt(i);
if (range.toString().length > 0 || allowEmptyRange) {
return range;
}
}
return null;
}
}