Move mixed/js (#1383)

* Move mixed/js/core.js to js/core.js

* Move mixed/js/yomichan.js to js/yomichan.js

* Move mixed/js/timer.js to js/debug/timer.js

* Move mixed/js/hotkey-handler.js to js/input/hotkey-handler.js

* Move mixed/js/hotkey-help-controller.js to js/input/hotkey-help-controller.js

* Move mixed/js/hotkey-util.js to js/input/hotkey-util.js

* Move mixed/js/audio-system.js to js/input/audio-system.js

* Move mixed/js/media-loader.js to js/input/media-loader.js

* Move mixed/js/text-to-speech-audio.js to js/input/text-to-speech-audio.js

* Move mixed/js/comm.js to js/comm/cross-frame-api.js

* Move mixed/js/api.js to js/comm/api.js

* Move mixed/js/frame-client.js to js/comm/frame-client.js

* Move mixed/js/frame-endpoint.js to js/comm/frame-endpoint.js

* Move mixed/js/display.js to js/display/display.js

* Move mixed/js/display-audio.js to js/display/display-audio.js

* Move mixed/js/display-generator.js to js/display/display-generator.js

* Move mixed/js/display-history.js to js/display/display-history.js

* Move mixed/js/display-notification.js to js/display/display-notification.js

* Move mixed/js/display-profile-selection.js to js/display/display-profile-selection.js

* Move mixed/js/japanese.js to js/language/japanese-util.js

* Move mixed/js/dictionary-data-util.js to js/language/dictionary-data-util.js

* Move mixed/js/document-focus-controller.js to js/dom/document-focus-controller.js

* Move mixed/js/document-util.js to js/dom/document-util.js

* Move mixed/js/dom-data-binder.js to js/dom/dom-data-binder.js

* Move mixed/js/html-template-collection.js to js/dom/html-template-collection.js

* Move mixed/js/panel-element.js to js/dom/panel-element.js

* Move mixed/js/popup-menu.js to js/dom/popup-menu.js

* Move mixed/js/selector-observer.js to js/dom/selector-observer.js

* Move mixed/js/scroll.js to js/dom/window-scroll.js

* Move mixed/js/text-scanner.js to js/language/text-scanner.js

* Move mixed/js/cache-map.js to js/general/cache-map.js

* Move mixed/js/object-property-accessor.js to js/general/object-property-accessor.js

* Move mixed/js/task-accumulator.js to js/general/task-accumulator.js

* Move mixed/js/environment.js to js/background/environment.js

* Move mixed/js/dynamic-loader.js to js/scripting/dynamic-loader.js

* Move mixed/js/dynamic-loader-sentinel.js to js/scripting/dynamic-loader-sentinel.js

1 files changed, 982 insertions, 0 deletions

diff --git a/ext/js/language/text-scanner.js b/ext/js/language/text-scanner.js
new file mode 100644
index 00000000..7672b69d
--- /dev/null
+++ b/ext/js/language/text-scanner.js
@@ -0,0 +1,982 @@
+/*
+ * Copyright (C) 2019-2021  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
+ * api
+ */
+
+class TextScanner extends EventDispatcher {
+    constructor({
+        node,
+        documentUtil,
+        getSearchContext,
+        ignoreElements=null,
+        ignorePoint=null,
+        searchTerms=false,
+        searchKanji=false,
+        searchOnClick=false,
+        searchOnClickOnly=false
+    }) {
+        super();
+        this._node = node;
+        this._documentUtil = documentUtil;
+        this._getSearchContext = getSearchContext;
+        this._ignoreElements = ignoreElements;
+        this._ignorePoint = ignorePoint;
+        this._searchTerms = searchTerms;
+        this._searchKanji = searchKanji;
+        this._searchOnClick = searchOnClick;
+        this._searchOnClickOnly = searchOnClickOnly;
+
+        this._isPrepared = false;
+        this._includeSelector = null;
+        this._excludeSelector = null;
+
+        this._inputInfoCurrent = null;
+        this._scanTimerPromise = null;
+        this._textSourceCurrent = null;
+        this._textSourceCurrentSelected = false;
+        this._pendingLookup = false;
+
+        this._deepContentScan = false;
+        this._selectText = false;
+        this._delay = 0;
+        this._touchInputEnabled = false;
+        this._pointerEventsEnabled = false;
+        this._scanLength = 1;
+        this._layoutAwareScan = false;
+        this._preventMiddleMouse = false;
+        this._sentenceScanExtent = 0;
+        this._sentenceTerminatorMap = new Map();
+        this._sentenceForwardQuoteMap = new Map();
+        this._sentenceBackwardQuoteMap = new Map();
+        this._inputs = [];
+
+        this._enabled = false;
+        this._enabledValue = false;
+        this._eventListeners = new EventListenerCollection();
+
+        this._primaryTouchIdentifier = null;
+        this._preventNextContextMenu = false;
+        this._preventNextMouseDown = false;
+        this._preventNextClick = false;
+        this._preventScroll = false;
+        this._penPointerPressed = false;
+        this._penPointerReleased = false;
+        this._pointerIdTypeMap = new Map();
+
+        this._canClearSelection = true;
+    }
+
+    get canClearSelection() {
+        return this._canClearSelection;
+    }
+
+    set canClearSelection(value) {
+        this._canClearSelection = value;
+    }
+
+    get includeSelector() {
+        return this._includeSelector;
+    }
+
+    set includeSelector(value) {
+        this._includeSelector = value;
+    }
+
+    get excludeSelector() {
+        return this._excludeSelector;
+    }
+
+    set excludeSelector(value) {
+        this._excludeSelector = value;
+    }
+
+    prepare() {
+        this._isPrepared = true;
+        this.setEnabled(this._enabled);
+    }
+
+    setEnabled(enabled) {
+        this._enabled = enabled;
+
+        const value = enabled && this._isPrepared;
+        if (this._enabledValue === value) { return; }
+
+        this._eventListeners.removeAllEventListeners();
+        this._primaryTouchIdentifier = null;
+        this._preventNextContextMenu = false;
+        this._preventNextMouseDown = false;
+        this._preventNextClick = false;
+        this._preventScroll = false;
+        this._penPointerPressed = false;
+        this._penPointerReleased = false;
+        this._pointerIdTypeMap.clear();
+
+        this._enabledValue = value;
+
+        if (value) {
+            this._hookEvents();
+        } else {
+            this.clearSelection(true);
+        }
+    }
+
+    setOptions({
+        inputs,
+        deepContentScan,
+        selectText,
+        delay,
+        touchInputEnabled,
+        pointerEventsEnabled,
+        scanLength,
+        layoutAwareScan,
+        preventMiddleMouse,
+        sentenceParsingOptions
+    }) {
+        if (Array.isArray(inputs)) {
+            this._inputs = inputs.map(({
+                include,
+                exclude,
+                types,
+                options: {
+                    searchTerms,
+                    searchKanji,
+                    scanOnTouchMove,
+                    scanOnPenHover,
+                    scanOnPenPress,
+                    scanOnPenRelease,
+                    preventTouchScrolling
+                }
+            }) => ({
+                include: this._getInputArray(include),
+                exclude: this._getInputArray(exclude),
+                types: this._getInputTypeSet(types),
+                options: {
+                    searchTerms,
+                    searchKanji,
+                    scanOnTouchMove,
+                    scanOnPenHover,
+                    scanOnPenPress,
+                    scanOnPenRelease,
+                    preventTouchScrolling
+                }
+            }));
+        }
+        if (typeof deepContentScan === 'boolean') {
+            this._deepContentScan = deepContentScan;
+        }
+        if (typeof selectText === 'boolean') {
+            this._selectText = selectText;
+        }
+        if (typeof delay === 'number') {
+            this._delay = delay;
+        }
+        if (typeof touchInputEnabled === 'boolean') {
+            this._touchInputEnabled = touchInputEnabled;
+        }
+        if (typeof pointerEventsEnabled === 'boolean') {
+            this._pointerEventsEnabled = pointerEventsEnabled;
+        }
+        if (typeof scanLength === 'number') {
+            this._scanLength = scanLength;
+        }
+        if (typeof layoutAwareScan === 'boolean') {
+            this._layoutAwareScan = layoutAwareScan;
+        }
+        if (typeof preventMiddleMouse === 'boolean') {
+            this._preventMiddleMouse = preventMiddleMouse;
+        }
+        if (typeof sentenceParsingOptions === 'object' && sentenceParsingOptions !== null) {
+            const {scanExtent, enableTerminationCharacters, terminationCharacters} = sentenceParsingOptions;
+            const hasTerminationCharacters = (typeof terminationCharacters === 'object' && Array.isArray(terminationCharacters));
+            if (typeof scanExtent === 'number') {
+                this._sentenceScanExtent = sentenceParsingOptions.scanExtent;
+            }
+            if (typeof enableTerminationCharacters === 'boolean' || hasTerminationCharacters) {
+                const sentenceTerminatorMap = this._sentenceTerminatorMap;
+                const sentenceForwardQuoteMap = this._sentenceForwardQuoteMap;
+                const sentenceBackwardQuoteMap = this._sentenceBackwardQuoteMap;
+                sentenceTerminatorMap.clear();
+                sentenceForwardQuoteMap.clear();
+                sentenceBackwardQuoteMap.clear();
+                if (enableTerminationCharacters !== false && hasTerminationCharacters) {
+                    for (const {enabled, character1, character2, includeCharacterAtStart, includeCharacterAtEnd} of terminationCharacters) {
+                        if (!enabled) { continue; }
+                        if (character2 === null) {
+                            sentenceTerminatorMap.set(character1, [includeCharacterAtStart, includeCharacterAtEnd]);
+                        } else {
+                            sentenceForwardQuoteMap.set(character1, [character2, includeCharacterAtStart]);
+                            sentenceBackwardQuoteMap.set(character2, [character1, includeCharacterAtEnd]);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    getTextSourceContent(textSource, length, layoutAwareScan) {
+        const clonedTextSource = textSource.clone();
+
+        clonedTextSource.setEndOffset(length, layoutAwareScan);
+
+        const includeSelector = this._includeSelector;
+        const excludeSelector = this._excludeSelector;
+        if (includeSelector !== null || excludeSelector !== null) {
+            this._constrainTextSource(clonedTextSource, includeSelector, excludeSelector, layoutAwareScan);
+        }
+
+        return clonedTextSource.text();
+    }
+
+    hasSelection() {
+        return (this._textSourceCurrent !== null);
+    }
+
+    clearSelection(passive) {
+        if (!this._canClearSelection) { return; }
+        if (this._textSourceCurrent !== null) {
+            if (this._textSourceCurrentSelected) {
+                this._textSourceCurrent.deselect();
+            }
+            this._textSourceCurrent = null;
+            this._textSourceCurrentSelected = false;
+            this._inputInfoCurrent = null;
+        }
+        this.trigger('clearSelection', {passive});
+    }
+
+    getCurrentTextSource() {
+        return this._textSourceCurrent;
+    }
+
+    setCurrentTextSource(textSource) {
+        this._textSourceCurrent = textSource;
+        if (this._selectText) {
+            this._textSourceCurrent.select();
+            this._textSourceCurrentSelected = true;
+        } else {
+            this._textSourceCurrentSelected = false;
+        }
+    }
+
+    async searchLast() {
+        if (this._textSourceCurrent !== null && this._inputInfoCurrent !== null) {
+            await this._search(this._textSourceCurrent, this._searchTerms, this._searchKanji, this._inputInfoCurrent);
+            return true;
+        }
+        return false;
+    }
+
+    async search(textSource, inputDetail) {
+        const inputInfo = this._createInputInfo(null, 'script', 'script', true, [], [], inputDetail);
+        return await this._search(textSource, this._searchTerms, this._searchKanji, inputInfo);
+    }
+
+    // Private
+
+    _createOptionsContextForInput(baseOptionsContext, inputInfo) {
+        const optionsContext = clone(baseOptionsContext);
+        const {modifiers, modifierKeys} = inputInfo;
+        optionsContext.modifiers = [...modifiers];
+        optionsContext.modifierKeys = [...modifierKeys];
+        return optionsContext;
+    }
+
+    async _search(textSource, searchTerms, searchKanji, inputInfo) {
+        let definitions = null;
+        let sentence = null;
+        let type = null;
+        let error = null;
+        let searched = false;
+        let optionsContext = null;
+        let detail = null;
+
+        try {
+            if (this._textSourceCurrent !== null && this._textSourceCurrent.hasSameStart(textSource)) {
+                return null;
+            }
+
+            ({optionsContext, detail} = await this._getSearchContext());
+            optionsContext = this._createOptionsContextForInput(optionsContext, inputInfo);
+
+            searched = true;
+
+            const result = await this._findDefinitions(textSource, searchTerms, searchKanji, optionsContext);
+            if (result !== null) {
+                ({definitions, sentence, type} = result);
+                this._inputInfoCurrent = inputInfo;
+                this.setCurrentTextSource(textSource);
+            }
+        } catch (e) {
+            error = e;
+        }
+
+        if (!searched) { return null; }
+
+        const results = {
+            textScanner: this,
+            type,
+            definitions,
+            sentence,
+            inputInfo,
+            textSource,
+            optionsContext,
+            detail,
+            error
+        };
+        this.trigger('searched', results);
+        return results;
+    }
+
+    _onMouseOver(e) {
+        if (this._ignoreElements !== null && this._ignoreElements().includes(e.target)) {
+            this._scanTimerClear();
+        }
+    }
+
+    _onMouseMove(e) {
+        this._scanTimerClear();
+
+        const inputInfo = this._getMatchingInputGroupFromEvent('mouse', 'mouseMove', e);
+        if (inputInfo === null) { return; }
+
+        this._searchAtFromMouseMove(e.clientX, e.clientY, inputInfo);
+    }
+
+    _onMouseDown(e) {
+        if (this._preventNextMouseDown) {
+            this._preventNextMouseDown = false;
+            this._preventNextClick = true;
+            e.preventDefault();
+            e.stopPropagation();
+            return false;
+        }
+
+        switch (e.button) {
+            case 0: // Primary
+                this._scanTimerClear();
+                this.clearSelection(false);
+                break;
+            case 1: // Middle
+                if (this._preventMiddleMouse) {
+                    e.preventDefault();
+                    e.stopPropagation();
+                    return false;
+                }
+                break;
+        }
+    }
+
+    _onMouseOut() {
+        this._scanTimerClear();
+    }
+
+    _onClick(e) {
+        if (this._searchOnClick) {
+            const modifiers = DocumentUtil.getActiveModifiersAndButtons(e);
+            const modifierKeys = DocumentUtil.getActiveModifiers(e);
+            const inputInfo = this._createInputInfo(null, 'mouse', 'click', false, modifiers, modifierKeys);
+            this._searchAt(e.clientX, e.clientY, inputInfo);
+        }
+
+        if (this._preventNextClick) {
+            this._preventNextClick = false;
+            e.preventDefault();
+            e.stopPropagation();
+            return false;
+        }
+    }
+
+    _onAuxClick() {
+        this._preventNextContextMenu = false;
+    }
+
+    _onContextMenu(e) {
+        if (this._preventNextContextMenu) {
+            this._preventNextContextMenu = false;
+            e.preventDefault();
+            e.stopPropagation();
+            return false;
+        }
+    }
+
+    _onTouchStart(e) {
+        if (this._primaryTouchIdentifier !== null || e.changedTouches.length === 0) {
+            return;
+        }
+
+        const {clientX, clientY, identifier} = e.changedTouches[0];
+        this._onPrimaryTouchStart(e, clientX, clientY, identifier);
+    }
+
+    _onPrimaryTouchStart(e, x, y, identifier) {
+        this._preventScroll = false;
+        this._preventNextContextMenu = false;
+        this._preventNextMouseDown = false;
+        this._preventNextClick = false;
+
+        if (DocumentUtil.isPointInSelection(x, y, window.getSelection())) {
+            return;
+        }
+
+        this._primaryTouchIdentifier = identifier;
+
+        this._searchAtFromTouchStart(e, x, y);
+    }
+
+    _onTouchEnd(e) {
+        if (
+            this._primaryTouchIdentifier === null ||
+            this._getTouch(e.changedTouches, this._primaryTouchIdentifier) === null
+        ) {
+            return;
+        }
+
+        this._onPrimaryTouchEnd();
+    }
+
+    _onPrimaryTouchEnd() {
+        this._primaryTouchIdentifier = null;
+        this._preventScroll = false;
+        this._preventNextClick = false;
+        // Don't revert context menu and mouse down prevention, since these events can occur after the touch has ended.
+        // I.e. this._preventNextContextMenu and this._preventNextMouseDown should not be assigned to false.
+    }
+
+    _onTouchCancel(e) {
+        this._onTouchEnd(e);
+    }
+
+    _onTouchMove(e) {
+        if (!this._preventScroll || !e.cancelable || this._primaryTouchIdentifier === null) {
+            return;
+        }
+
+        const primaryTouch = this._getTouch(e.changedTouches, this._primaryTouchIdentifier);
+        if (primaryTouch === null) {
+            return;
+        }
+
+        const inputInfo = this._getMatchingInputGroupFromEvent('touch', 'touchMove', e);
+        if (inputInfo === null) { return; }
+
+        if (inputInfo.input.options.scanOnTouchMove) {
+            this._searchAt(primaryTouch.clientX, primaryTouch.clientY, inputInfo);
+        }
+
+        e.preventDefault(); // Disable scroll
+    }
+
+    _onPointerOver(e) {
+        const {pointerType, pointerId, isPrimary} = e;
+        if (pointerType === 'pen') {
+            this._pointerIdTypeMap.set(pointerId, pointerType);
+        }
+
+        if (!isPrimary) { return; }
+        switch (pointerType) {
+            case 'mouse': return this._onMousePointerOver(e);
+            case 'touch': return this._onTouchPointerOver(e);
+            case 'pen': return this._onPenPointerOver(e);
+        }
+    }
+
+    _onPointerDown(e) {
+        if (!e.isPrimary) { return; }
+        switch (this._getPointerEventType(e)) {
+            case 'mouse': return this._onMousePointerDown(e);
+            case 'touch': return this._onTouchPointerDown(e);
+            case 'pen': return this._onPenPointerDown(e);
+        }
+    }
+
+    _onPointerMove(e) {
+        if (!e.isPrimary) { return; }
+        switch (this._getPointerEventType(e)) {
+            case 'mouse': return this._onMousePointerMove(e);
+            case 'touch': return this._onTouchPointerMove(e);
+            case 'pen': return this._onPenPointerMove(e);
+        }
+    }
+
+    _onPointerUp(e) {
+        if (!e.isPrimary) { return; }
+        switch (this._getPointerEventType(e)) {
+            case 'mouse': return this._onMousePointerUp(e);
+            case 'touch': return this._onTouchPointerUp(e);
+            case 'pen': return this._onPenPointerUp(e);
+        }
+    }
+
+    _onPointerCancel(e) {
+        this._pointerIdTypeMap.delete(e.pointerId);
+        if (!e.isPrimary) { return; }
+        switch (e.pointerType) {
+            case 'mouse': return this._onMousePointerCancel(e);
+            case 'touch': return this._onTouchPointerCancel(e);
+            case 'pen': return this._onPenPointerCancel(e);
+        }
+    }
+
+    _onPointerOut(e) {
+        this._pointerIdTypeMap.delete(e.pointerId);
+        if (!e.isPrimary) { return; }
+        switch (e.pointerType) {
+            case 'mouse': return this._onMousePointerOut(e);
+            case 'touch': return this._onTouchPointerOut(e);
+            case 'pen': return this._onPenPointerOut(e);
+        }
+    }
+
+    _onMousePointerOver(e) {
+        return this._onMouseOver(e);
+    }
+
+    _onMousePointerDown(e) {
+        return this._onMouseDown(e);
+    }
+
+    _onMousePointerMove(e) {
+        return this._onMouseMove(e);
+    }
+
+    _onMousePointerUp() {
+        // NOP
+    }
+
+    _onMousePointerCancel(e) {
+        return this._onMouseOut(e);
+    }
+
+    _onMousePointerOut(e) {
+        return this._onMouseOut(e);
+    }
+
+    _onTouchPointerOver() {
+        // NOP
+    }
+
+    _onTouchPointerDown(e) {
+        const {clientX, clientY, pointerId} = e;
+        return this._onPrimaryTouchStart(e, clientX, clientY, pointerId);
+    }
+
+    _onTouchPointerMove(e) {
+        if (!this._preventScroll || !e.cancelable) {
+            return;
+        }
+
+        const inputInfo = this._getMatchingInputGroupFromEvent('touch', 'touchMove', e);
+        if (inputInfo === null || !inputInfo.input.options.scanOnTouchMove) { return; }
+
+        this._searchAt(e.clientX, e.clientY, inputInfo);
+    }
+
+    _onTouchPointerUp() {
+        return this._onPrimaryTouchEnd();
+    }
+
+    _onTouchPointerCancel() {
+        return this._onPrimaryTouchEnd();
+    }
+
+    _onTouchPointerOut() {
+        // NOP
+    }
+
+    _onTouchMovePreventScroll(e) {
+        if (!this._preventScroll) { return; }
+
+        if (e.cancelable) {
+            e.preventDefault();
+        } else {
+            this._preventScroll = false;
+        }
+    }
+
+    _onPenPointerOver(e) {
+        this._penPointerPressed = false;
+        this._penPointerReleased = false;
+        this._searchAtFromPen(e, e.clientX, e.clientY, 'pointerOver', false);
+    }
+
+    _onPenPointerDown(e) {
+        this._penPointerPressed = true;
+        this._searchAtFromPen(e, e.clientX, e.clientY, 'pointerDown', true);
+    }
+
+    _onPenPointerMove(e) {
+        if (this._penPointerPressed && (!this._preventScroll || !e.cancelable)) { return; }
+        this._searchAtFromPen(e, e.clientX, e.clientY, 'pointerMove', true);
+    }
+
+    _onPenPointerUp() {
+        this._penPointerPressed = false;
+        this._penPointerReleased = true;
+        this._preventScroll = false;
+    }
+
+    _onPenPointerCancel(e) {
+        this._onPenPointerOut(e);
+    }
+
+    _onPenPointerOut() {
+        this._penPointerPressed = false;
+        this._penPointerReleased = false;
+        this._preventScroll = false;
+        this._preventNextContextMenu = false;
+        this._preventNextMouseDown = false;
+        this._preventNextClick = false;
+    }
+
+    async _scanTimerWait() {
+        const delay = this._delay;
+        const promise = promiseTimeout(delay, true);
+        this._scanTimerPromise = promise;
+        try {
+            return await promise;
+        } finally {
+            if (this._scanTimerPromise === promise) {
+                this._scanTimerPromise = null;
+            }
+        }
+    }
+
+    _scanTimerClear() {
+        if (this._scanTimerPromise !== null) {
+            this._scanTimerPromise.resolve(false);
+            this._scanTimerPromise = null;
+        }
+    }
+
+    _arePointerEventsSupported() {
+        return (this._pointerEventsEnabled && typeof PointerEvent !== 'undefined');
+    }
+
+    _hookEvents() {
+        let eventListenerInfos;
+        if (this._searchOnClickOnly) {
+            eventListenerInfos = this._getMouseClickOnlyEventListeners();
+        } else if (this._arePointerEventsSupported()) {
+            eventListenerInfos = this._getPointerEventListeners();
+        } else {
+            eventListenerInfos = this._getMouseEventListeners();
+            if (this._touchInputEnabled) {
+                eventListenerInfos.push(...this._getTouchEventListeners());
+            }
+        }
+
+        for (const args of eventListenerInfos) {
+            this._eventListeners.addEventListener(...args);
+        }
+    }
+
+    _getPointerEventListeners() {
+        return [
+            [this._node, 'pointerover', this._onPointerOver.bind(this)],
+            [this._node, 'pointerdown', this._onPointerDown.bind(this)],
+            [this._node, 'pointermove', this._onPointerMove.bind(this)],
+            [this._node, 'pointerup', this._onPointerUp.bind(this)],
+            [this._node, 'pointercancel', this._onPointerCancel.bind(this)],
+            [this._node, 'pointerout', this._onPointerOut.bind(this)],
+            [this._node, 'touchmove', this._onTouchMovePreventScroll.bind(this), {passive: false}],
+            [this._node, 'mousedown', this._onMouseDown.bind(this)],
+            [this._node, 'click', this._onClick.bind(this)],
+            [this._node, 'auxclick', this._onAuxClick.bind(this)]
+        ];
+    }
+
+    _getMouseEventListeners() {
+        return [
+            [this._node, 'mousedown', this._onMouseDown.bind(this)],
+            [this._node, 'mousemove', this._onMouseMove.bind(this)],
+            [this._node, 'mouseover', this._onMouseOver.bind(this)],
+            [this._node, 'mouseout', this._onMouseOut.bind(this)],
+            [this._node, 'click', this._onClick.bind(this)]
+        ];
+    }
+
+    _getMouseClickOnlyEventListeners() {
+        return [
+            [this._node, 'click', this._onClick.bind(this)]
+        ];
+    }
+    _getTouchEventListeners() {
+        return [
+            [this._node, 'auxclick', this._onAuxClick.bind(this)],
+            [this._node, 'touchstart', this._onTouchStart.bind(this)],
+            [this._node, 'touchend', this._onTouchEnd.bind(this)],
+            [this._node, 'touchcancel', this._onTouchCancel.bind(this)],
+            [this._node, 'touchmove', this._onTouchMove.bind(this), {passive: false}],
+            [this._node, 'contextmenu', this._onContextMenu.bind(this)]
+        ];
+    }
+
+    _getTouch(touchList, identifier) {
+        for (const touch of touchList) {
+            if (touch.identifier === identifier) {
+                return touch;
+            }
+        }
+        return null;
+    }
+
+    async _findDefinitions(textSource, searchTerms, searchKanji, optionsContext) {
+        if (textSource === null) {
+            return null;
+        }
+        if (searchTerms) {
+            const results = await this._findTerms(textSource, optionsContext);
+            if (results !== null) { return results; }
+        }
+        if (searchKanji) {
+            const results = await this._findKanji(textSource, optionsContext);
+            if (results !== null) { return results; }
+        }
+        return null;
+    }
+
+    async _findTerms(textSource, optionsContext) {
+        const scanLength = this._scanLength;
+        const sentenceScanExtent = this._sentenceScanExtent;
+        const sentenceTerminatorMap = this._sentenceTerminatorMap;
+        const sentenceForwardQuoteMap = this._sentenceForwardQuoteMap;
+        const sentenceBackwardQuoteMap = this._sentenceBackwardQuoteMap;
+        const layoutAwareScan = this._layoutAwareScan;
+        const searchText = this.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);
+        const sentence = this._documentUtil.extractSentence(
+            textSource,
+            layoutAwareScan,
+            sentenceScanExtent,
+            sentenceTerminatorMap,
+            sentenceForwardQuoteMap,
+            sentenceBackwardQuoteMap
+        );
+
+        return {definitions, sentence, type: 'terms'};
+    }
+
+    async _findKanji(textSource, optionsContext) {
+        const sentenceScanExtent = this._sentenceScanExtent;
+        const sentenceTerminatorMap = this._sentenceTerminatorMap;
+        const sentenceForwardQuoteMap = this._sentenceForwardQuoteMap;
+        const sentenceBackwardQuoteMap = this._sentenceBackwardQuoteMap;
+        const layoutAwareScan = this._layoutAwareScan;
+        const searchText = this.getTextSourceContent(textSource, 1, layoutAwareScan);
+        if (searchText.length === 0) { return null; }
+
+        const definitions = await api.kanjiFind(searchText, optionsContext);
+        if (definitions.length === 0) { return null; }
+
+        textSource.setEndOffset(1, layoutAwareScan);
+        const sentence = this._documentUtil.extractSentence(
+            textSource,
+            layoutAwareScan,
+            sentenceScanExtent,
+            sentenceTerminatorMap,
+            sentenceForwardQuoteMap,
+            sentenceBackwardQuoteMap
+        );
+
+        return {definitions, sentence, type: 'kanji'};
+    }
+
+    async _searchAt(x, y, inputInfo) {
+        if (this._pendingLookup) { return; }
+
+        try {
+            const sourceInput = inputInfo.input;
+            let searchTerms = this._searchTerms;
+            let searchKanji = this._searchKanji;
+            if (sourceInput !== null) {
+                if (searchTerms && !sourceInput.options.searchTerms) { searchTerms = false; }
+                if (searchKanji && !sourceInput.options.searchKanji) { searchKanji = false; }
+            }
+
+            this._pendingLookup = true;
+            this._scanTimerClear();
+
+            if (typeof this._ignorePoint === 'function' && await this._ignorePoint(x, y)) {
+                return;
+            }
+
+            const textSource = this._documentUtil.getRangeFromPoint(x, y, this._deepContentScan);
+            try {
+                await this._search(textSource, searchTerms, searchKanji, inputInfo);
+            } finally {
+                if (textSource !== null) {
+                    textSource.cleanup();
+                }
+            }
+        } catch (e) {
+            yomichan.logError(e);
+        } finally {
+            this._pendingLookup = false;
+        }
+    }
+
+    async _searchAtFromMouseMove(x, y, inputInfo) {
+        if (this._pendingLookup) { return; }
+
+        if (inputInfo.passive) {
+            if (!await this._scanTimerWait()) {
+                // Aborted
+                return;
+            }
+        }
+
+        await this._searchAt(x, y, inputInfo);
+    }
+
+    async _searchAtFromTouchStart(e, x, y) {
+        if (this._pendingLookup) { return; }
+
+        const inputInfo = this._getMatchingInputGroupFromEvent('touch', 'touchStart', e);
+        if (inputInfo === null) { return; }
+
+        const textSourceCurrentPrevious = this._textSourceCurrent !== null ? this._textSourceCurrent.clone() : null;
+        const preventScroll = inputInfo.input.options.preventTouchScrolling;
+
+        await this._searchAt(x, y, inputInfo);
+
+        if (
+            this._textSourceCurrent !== null &&
+            !this._textSourceCurrent.hasSameStart(textSourceCurrentPrevious)
+        ) {
+            this._preventScroll = preventScroll;
+            this._preventNextContextMenu = true;
+            this._preventNextMouseDown = true;
+        }
+    }
+
+    async _searchAtFromPen(e, x, y, eventType, prevent) {
+        if (this._pendingLookup) { return; }
+
+        const inputInfo = this._getMatchingInputGroupFromEvent('pen', eventType, e);
+        if (inputInfo === null) { return; }
+
+        const {input: {options}} = inputInfo;
+        if (
+            (!options.scanOnPenRelease && this._penPointerReleased) ||
+            !(this._penPointerPressed ? options.scanOnPenPress : options.scanOnPenHover)
+        ) {
+            return;
+        }
+
+        const preventScroll = inputInfo.input.options.preventTouchScrolling;
+
+        await this._searchAt(x, y, inputInfo);
+
+        if (
+            prevent &&
+            this._textSourceCurrent !== null
+        ) {
+            this._preventScroll = preventScroll;
+            this._preventNextContextMenu = true;
+            this._preventNextMouseDown = true;
+            this._preventNextClick = true;
+        }
+    }
+
+    _getMatchingInputGroupFromEvent(pointerType, eventType, event) {
+        const modifiers = DocumentUtil.getActiveModifiersAndButtons(event);
+        const modifierKeys = DocumentUtil.getActiveModifiers(event);
+        return this._getMatchingInputGroup(pointerType, eventType, modifiers, modifierKeys);
+    }
+
+    _getMatchingInputGroup(pointerType, eventType, modifiers, modifierKeys) {
+        let fallbackIndex = -1;
+        const modifiersSet = new Set(modifiers);
+        for (let i = 0, ii = this._inputs.length; i < ii; ++i) {
+            const input = this._inputs[i];
+            const {include, exclude, types} = input;
+            if (!types.has(pointerType)) { continue; }
+            if (this._setHasAll(modifiersSet, include) && (exclude.length === 0 || !this._setHasAll(modifiersSet, exclude))) {
+                if (include.length > 0) {
+                    return this._createInputInfo(input, pointerType, eventType, false, modifiers, modifierKeys);
+                } else if (fallbackIndex < 0) {
+                    fallbackIndex = i;
+                }
+            }
+        }
+
+        return (
+            fallbackIndex >= 0 ?
+            this._createInputInfo(this._inputs[fallbackIndex], pointerType, eventType, true, modifiers, modifierKeys) :
+            null
+        );
+    }
+
+    _createInputInfo(input, pointerType, eventType, passive, modifiers, modifierKeys, detail) {
+        return {input, pointerType, eventType, passive, modifiers, modifierKeys, detail};
+    }
+
+    _setHasAll(set, values) {
+        for (const value of values) {
+            if (!set.has(value)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    _getInputArray(value) {
+        return (
+            typeof value === 'string' ?
+            value.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0) :
+            []
+        );
+    }
+
+    _getInputTypeSet({mouse, touch, pen}) {
+        const set = new Set();
+        if (mouse) { set.add('mouse'); }
+        if (touch) { set.add('touch'); }
+        if (pen) { set.add('pen'); }
+        return set;
+    }
+
+    _getPointerEventType(e) {
+        // Workaround for Firefox bug not detecting certain 'touch' events as 'pen' events.
+        const cachedPointerType = this._pointerIdTypeMap.get(e.pointerId);
+        return (typeof cachedPointerType !== 'undefined' ? cachedPointerType : e.pointerType);
+    }
+
+    _constrainTextSource(textSource, includeSelector, excludeSelector, layoutAwareScan) {
+        let length = textSource.text().length;
+        while (length > 0) {
+            const nodes = textSource.getNodesInRange();
+            if (
+                (includeSelector !== null && !DocumentUtil.everyNodeMatchesSelector(nodes, includeSelector)) ||
+                (excludeSelector !== null && DocumentUtil.anyNodeMatchesSelector(nodes, excludeSelector))
+            ) {
+                --length;
+                textSource.setEndOffset(length, layoutAwareScan);
+            } else {
+                break;
+            }
+        }
+    }
+}