yomichan/ext/fg/js/frontend.js

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/*
* Copyright (C) 2016-2020 Yomichan Authors
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*
* 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
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
* DOM
* FrameOffsetForwarder
* PopupProxy
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* TextScanner
* api
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* docSentenceExtract
*/
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class Frontend {
constructor(frameId, popupFactory, frontendInitializationData) {
this._id = yomichan.generateId(16);
this._popup = null;
this._disabledOverride = false;
this._options = null;
this._pageZoomFactor = 1.0;
this._contentScale = 1.0;
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this._orphaned = false;
this._lastShowPromise = Promise.resolve();
this._enabledEventListeners = new EventListenerCollection();
this._activeModifiers = new Set();
this._optionsUpdatePending = false;
this._textScanner = new TextScanner({
node: window,
ignoreElements: this._ignoreElements.bind(this),
ignorePoint: this._ignorePoint.bind(this),
search: this._search.bind(this)
});
const {
depth=0,
id: proxyPopupId,
parentFrameId,
proxy: useProxyPopup=false,
isSearchPage=false,
allowRootFramePopupProxy=true
} = frontendInitializationData;
this._proxyPopupId = proxyPopupId;
this._parentFrameId = parentFrameId;
this._useProxyPopup = useProxyPopup;
this._isSearchPage = isSearchPage;
this._depth = depth;
this._frameId = frameId;
this._frameOffsetForwarder = new FrameOffsetForwarder();
this._popupFactory = popupFactory;
this._allowRootFramePopupProxy = allowRootFramePopupProxy;
this._popupCache = new Map();
this._updatePopupToken = null;
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this._windowMessageHandlers = new Map([
['popupClose', this._onMessagePopupClose.bind(this)],
['selectionCopy', this._onMessageSelectionCopy.bind()]
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]);
this._runtimeMessageHandlers = new Map([
['popupSetVisibleOverride', this._onMessagePopupSetVisibleOverride.bind(this)],
['rootPopupRequestInformationBroadcast', this._onMessageRootPopupRequestInformationBroadcast.bind(this)],
['requestDocumentInformationBroadcast', this._onMessageRequestDocumentInformationBroadcast.bind(this)]
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]);
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}
get canClearSelection() {
return this._textScanner.canClearSelection;
}
set canClearSelection(value) {
this._textScanner.canClearSelection = value;
}
get popup() {
return this._popup;
}
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async prepare() {
this._frameOffsetForwarder.prepare();
await this.updateOptions();
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try {
const {zoomFactor} = await api.getZoom();
this._pageZoomFactor = zoomFactor;
} catch (e) {
// Ignore exceptions which may occur due to being on an unsupported page (e.g. about:blank)
}
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this._textScanner.prepare();
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window.addEventListener('resize', this._onResize.bind(this), false);
DOM.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('orphaned', this._onOrphaned.bind(this));
yomichan.on('optionsUpdated', this.updateOptions.bind(this));
yomichan.on('zoomChanged', this._onZoomChanged.bind(this));
chrome.runtime.onMessage.addListener(this._onRuntimeMessage.bind(this));
this._textScanner.on('clearSelection', this._onClearSelection.bind(this));
this._textScanner.on('activeModifiersChanged', this._onActiveModifiersChanged.bind(this));
api.crossFrame.registerHandlers([
['getUrl', {async: false, handler: this._onApiGetUrl.bind(this)}]
]);
this._updateContentScale();
this._broadcastRootPopupInformation();
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}
setDisabledOverride(disabled) {
this._disabledOverride = disabled;
this._updateTextScannerEnabled();
}
async setTextSource(textSource) {
await this._search(textSource, 'script');
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this._textScanner.setCurrentTextSource(textSource);
}
async getOptionsContext() {
let url = window.location.href;
if (this._useProxyPopup) {
try {
url = await api.crossFrame.invoke(this._parentFrameId, 'getUrl', {});
} catch (e) {
// NOP
}
}
const depth = this._depth;
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const modifierKeys = [...this._activeModifiers];
return {depth, url, modifierKeys};
}
async updateOptions() {
const optionsContext = await this.getOptionsContext();
this._options = await api.optionsGet(optionsContext);
await this._updatePopup();
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this._textScanner.setOptions(this._options);
this._updateTextScannerEnabled();
const ignoreNodes = ['.scan-disable', '.scan-disable *'];
if (!this._options.scanning.enableOnPopupExpressions) {
ignoreNodes.push('.source-text', '.source-text *');
}
this._textScanner.ignoreNodes = ignoreNodes.join(',');
this._updateContentScale();
const textSourceCurrent = this._textScanner.getCurrentTextSource();
const causeCurrent = this._textScanner.causeCurrent;
if (textSourceCurrent !== null && causeCurrent !== null) {
await this._search(textSourceCurrent, causeCurrent);
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}
}
showContentCompleted() {
return this._lastShowPromise;
}
// Message handlers
_onMessagePopupClose() {
this._textScanner.clearSelection(false);
}
_onMessageSelectionCopy() {
document.execCommand('copy');
}
_onMessagePopupSetVisibleOverride({visible}) {
this._popup.setVisibleOverride(visible);
}
_onMessageRootPopupRequestInformationBroadcast() {
this._broadcastRootPopupInformation();
}
_onMessageRequestDocumentInformationBroadcast({uniqueId}) {
this._broadcastDocumentInformation(uniqueId);
}
// API message handlers
_onApiGetUrl() {
return window.location.href;
}
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// Private
_onResize() {
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this._updatePopupPosition();
}
_onWindowMessage(e) {
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const action = e.data;
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const handler = this._windowMessageHandlers.get(action);
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if (typeof handler !== 'function') { return false; }
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handler();
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}
_onRuntimeMessage({action, params}, sender, callback) {
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const handler = this._runtimeMessageHandlers.get(action);
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if (typeof handler !== 'function') { return false; }
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const result = handler(params, sender);
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callback(result);
return false;
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}
_onOrphaned() {
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this._orphaned = true;
}
_onZoomChanged({newZoomFactor}) {
this._pageZoomFactor = newZoomFactor;
this._updateContentScale();
}
_onVisualViewportScroll() {
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this._updatePopupPosition();
}
_onVisualViewportResize() {
this._updateContentScale();
}
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_onClearSelection({passive}) {
this._popup.hide(!passive);
this._popup.clearAutoPlayTimer();
this._updatePendingOptions();
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}
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async _onActiveModifiersChanged({modifiers}) {
if (areSetsEqual(modifiers, this._activeModifiers)) { return; }
this._activeModifiers = modifiers;
if (await this._popup.isVisible()) {
this._optionsUpdatePending = true;
return;
}
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await this.updateOptions();
}
async _updatePopup() {
const showIframePopupsInRootFrame = this._options.general.showIframePopupsInRootFrame;
const isIframe = !this._useProxyPopup && (window !== window.parent);
let popupPromise;
if (
isIframe &&
showIframePopupsInRootFrame &&
DOM.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; }
await popup.setOptionsContext(optionsContext, this._id);
if (this._updatePopupToken !== token) { return; }
if (this._isSearchPage) {
this.setDisabledOverride(!this._options.scanning.enableOnSearchPage);
}
this._textScanner.clearSelection(true);
this._popup = popup;
this._depth = popup.depth;
}
async _getDefaultPopup() {
return this._popupFactory.getOrCreatePopup(null, null, this._depth);
}
async _getProxyPopup() {
const popup = new PopupProxy(null, this._depth + 1, this._proxyPopupId, this._parentFrameId);
await popup.prepare();
return popup;
}
async _getIframeProxyPopup() {
const rootPopupInformationPromise = yomichan.getTemporaryListenerResult(
chrome.runtime.onMessage,
({action, params}, {resolve}) => {
if (action === 'rootPopupInformation') {
resolve(params);
}
}
);
api.broadcastTab('rootPopupRequestInformationBroadcast');
const {popupId, frameId: parentFrameId} = await rootPopupInformationPromise;
const popup = new PopupProxy(popupId, 0, null, parentFrameId, this._frameOffsetForwarder);
popup.on('offsetNotFound', () => {
this._allowRootFramePopupProxy = false;
this._updatePopup();
});
await popup.prepare();
return popup;
}
_ignoreElements() {
return this._popup === null || this._popup.isProxy() ? [] : [this._popup.getContainer()];
}
_ignorePoint(x, y) {
return this._popup !== null && this._popup.containsPoint(x, y);
}
async _search(textSource, cause) {
await this._updatePendingOptions();
let results = null;
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try {
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if (textSource !== null) {
const optionsContext = await this.getOptionsContext();
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results = (
await this._findTerms(textSource, optionsContext) ||
await this._findKanji(textSource, optionsContext)
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);
if (results !== null) {
const focus = (cause === 'mouse');
this._showContent(textSource, focus, results.definitions, results.type, optionsContext);
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}
}
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} catch (e) {
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if (this._orphaned) {
if (textSource !== null && this._options.scanning.modifier !== 'none') {
this._showPopupContent(textSource, await this.getOptionsContext(), 'orphaned');
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}
} else {
yomichan.logError(e);
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}
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} finally {
if (results === null && this._options.scanning.autoHideResults) {
this._textScanner.clearSelection(false);
}
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}
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return results;
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}
async _findTerms(textSource, optionsContext) {
const {length: scanLength, layoutAwareScan} = this._options.scanning;
const searchText = this._textScanner.getTextSourceContent(textSource, scanLength, layoutAwareScan);
if (searchText.length === 0) { return null; }
const {definitions, length} = await api.termsFind(searchText, {}, optionsContext);
if (definitions.length === 0) { return null; }
textSource.setEndOffset(length, layoutAwareScan);
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return {definitions, type: 'terms'};
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}
async _findKanji(textSource, optionsContext) {
const layoutAwareScan = this._options.scanning.layoutAwareScan;
const searchText = this._textScanner.getTextSourceContent(textSource, 1, layoutAwareScan);
if (searchText.length === 0) { return null; }
const definitions = await api.kanjiFind(searchText, optionsContext);
if (definitions.length === 0) { return null; }
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textSource.setEndOffset(1, layoutAwareScan);
return {definitions, type: 'kanji'};
}
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_showContent(textSource, focus, definitions, type, optionsContext) {
const {url} = optionsContext;
const sentenceExtent = this._options.anki.sentenceExt;
const layoutAwareScan = this._options.scanning.layoutAwareScan;
const sentence = docSentenceExtract(textSource, sentenceExtent, layoutAwareScan);
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this._showPopupContent(
textSource,
optionsContext,
type,
{definitions, context: {sentence, url, focus, disableHistory: true}}
);
}
_showPopupContent(textSource, optionsContext, type=null, details=null) {
const context = {optionsContext, source: this._id};
this._lastShowPromise = this._popup.showContent(
textSource.getRect(),
textSource.getWritingMode(),
type,
details,
context
);
return this._lastShowPromise;
}
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async _updatePendingOptions() {
if (this._optionsUpdatePending) {
this._optionsUpdatePending = false;
await this.updateOptions();
}
}
_updateTextScannerEnabled() {
const enabled = (
this._options.general.enable &&
this._depth <= this._options.scanning.popupNestingMaxDepth &&
!this._disabledOverride
);
this._enabledEventListeners.removeAllEventListeners();
this._textScanner.setEnabled(enabled);
if (enabled) {
this._enabledEventListeners.addEventListener(window, 'message', this._onWindowMessage.bind(this));
}
}
_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);
}
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this._updatePopupPosition();
}
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async _updatePopupPosition() {
const textSource = this._textScanner.getCurrentTextSource();
if (
textSource !== null &&
this._popup !== null &&
await this._popup.isVisible()
) {
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this._showPopupContent(textSource, await this.getOptionsContext());
}
}
_broadcastRootPopupInformation() {
if (
this._popup !== null &&
!this._popup.isProxy() &&
this._depth === 0 &&
this._frameId === 0
) {
api.broadcastTab('rootPopupInformation', {
popupId: this._popup.id,
frameId: this._frameId
});
}
}
_broadcastDocumentInformation(uniqueId) {
api.broadcastTab('documentInformationBroadcast', {
uniqueId,
frameId: this._frameId,
title: document.title
});
}
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}