yomichan/ext/mixed/js/text-scanner.js

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/*
* Copyright (C) 2019-2020 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
* DocumentUtil
* api
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*/
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class TextScanner extends EventDispatcher {
constructor({
node,
documentUtil,
getOptionsContext,
ignoreElements=null,
ignorePoint=null,
searchTerms=false,
searchKanji=false,
searchOnClick=false,
searchOnClickOnly=false
}) {
super();
this._node = node;
this._documentUtil = documentUtil;
this._getOptionsContext = getOptionsContext;
this._ignoreElements = ignoreElements;
this._ignorePoint = ignorePoint;
this._searchTerms = searchTerms;
this._searchKanji = searchKanji;
this._searchOnClick = searchOnClick;
this._searchOnClickOnly = searchOnClickOnly;
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this._isPrepared = false;
this._includeSelector = null;
this._excludeSelector = null;
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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._sentenceExtent = 1;
this._layoutAwareScan = false;
this._preventMiddleMouse = false;
this._inputs = [];
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this._enabled = false;
this._enabledValue = false;
this._eventListeners = new EventListenerCollection();
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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;
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}
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, sentenceExtent, layoutAwareScan, preventMiddleMouse}) {
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 sentenceExtent === 'number') {
this._sentenceExtent = sentenceExtent;
}
if (typeof layoutAwareScan === 'boolean') {
this._layoutAwareScan = layoutAwareScan;
}
if (typeof preventMiddleMouse === 'boolean') {
this._preventMiddleMouse = preventMiddleMouse;
}
}
getTextSourceContent(textSource, length, layoutAwareScan) {
const clonedTextSource = textSource.clone();
clonedTextSource.setEndOffset(length, layoutAwareScan);
if (this._excludeSelector !== null) {
this._constrainTextSource(clonedTextSource, this._includeSelector, this._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) {
const inputInfo = this._createInputInfo(-1, false, null, 'script', 'script', [], []);
return await this._search(textSource, this._searchTerms, this._searchKanji, inputInfo);
}
// Private
async _getOptionsContextForInput(inputInfo) {
const optionsContext = clone(await this._getOptionsContext());
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;
try {
if (this._textSourceCurrent !== null && this._textSourceCurrent.hasSameStart(textSource)) {
return;
}
optionsContext = await this._getOptionsContextForInput(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; }
this.trigger('searched', {
textScanner: this,
type,
definitions,
sentence,
inputInfo,
textSource,
optionsContext,
error
});
}
_onMouseOver(e) {
if (this._ignoreElements !== null && this._ignoreElements().includes(e.target)) {
this._scanTimerClear();
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}
}
_onMouseMove(e) {
this._scanTimerClear();
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const inputInfo = this._getMatchingInputGroupFromEvent('mouse', 'mouseMove', e);
if (inputInfo === null) { return; }
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this._searchAtFromMouseMove(e.clientX, e.clientY, inputInfo);
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}
_onMouseDown(e) {
if (this._preventNextMouseDown) {
this._preventNextMouseDown = false;
this._preventNextClick = true;
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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;
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}
}
_onMouseOut() {
this._scanTimerClear();
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}
_onClick(e) {
if (this._searchOnClick) {
const modifiers = DocumentUtil.getActiveModifiersAndButtons(e);
const modifierKeys = DocumentUtil.getActiveModifiers(e);
const inputInfo = this._createInputInfo(-1, false, null, 'mouse', 'click', modifiers, modifierKeys);
this._searchAt(e.clientX, e.clientY, inputInfo);
}
if (this._preventNextClick) {
this._preventNextClick = false;
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e.preventDefault();
e.stopPropagation();
return false;
}
}
_onAuxClick() {
this._preventNextContextMenu = false;
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}
_onContextMenu(e) {
if (this._preventNextContextMenu) {
this._preventNextContextMenu = false;
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e.preventDefault();
e.stopPropagation();
return false;
}
}
_onTouchStart(e) {
if (this._primaryTouchIdentifier !== null || e.changedTouches.length === 0) {
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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;
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if (DocumentUtil.isPointInSelection(x, y, window.getSelection())) {
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return;
}
this._primaryTouchIdentifier = identifier;
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this._searchAtFromTouchStart(e, x, y);
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}
_onTouchEnd(e) {
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if (
this._primaryTouchIdentifier === null ||
this._getTouch(e.changedTouches, this._primaryTouchIdentifier) === null
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) {
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.
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}
_onTouchCancel(e) {
this._onTouchEnd(e);
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}
_onTouchMove(e) {
if (!this._preventScroll || !e.cancelable || this._primaryTouchIdentifier === null) {
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return;
}
const primaryTouch = this._getTouch(e.changedTouches, this._primaryTouchIdentifier);
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if (primaryTouch === null) {
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return;
}
const inputInfo = this._getMatchingInputGroupFromEvent('touch', 'touchMove', e);
if (inputInfo === null) { return; }
if (inputInfo.input.options.scanOnTouchMove) {
this._searchAt(primaryTouch.clientX, primaryTouch.clientY, inputInfo);
}
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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;
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const promise = promiseTimeout(delay, true);
this._scanTimerPromise = promise;
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try {
return await promise;
} finally {
if (this._scanTimerPromise === promise) {
this._scanTimerPromise = null;
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}
}
}
_scanTimerClear() {
if (this._scanTimerPromise !== null) {
this._scanTimerPromise.resolve(false);
this._scanTimerPromise = null;
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}
}
_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());
}
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}
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for (const [node, type, listener, options] of eventListenerInfos) {
this._eventListeners.addEventListener(node, type, listener, options);
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}
}
_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() {
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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)]
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];
}
_getMouseClickOnlyEventListeners() {
return [
[this._node, 'click', this._onClick.bind(this)]
];
}
_getTouchEventListeners() {
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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)]
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];
}
_getTouch(touchList, identifier) {
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for (const touch of touchList) {
if (touch.identifier === identifier) {
return touch;
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}
}
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return null;
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}
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 sentenceExtent = this._sentenceExtent;
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, sentenceExtent, layoutAwareScan);
return {definitions, sentence, type: 'terms'};
}
async _findKanji(textSource, optionsContext) {
const sentenceExtent = this._sentenceExtent;
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, sentenceExtent, layoutAwareScan);
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.empty) {
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, cause, prevent) {
if (this._pendingLookup) { return; }
const inputInfo = this._getMatchingInputGroupFromEvent('pen', cause, 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(type, cause, event) {
const modifiers = DocumentUtil.getActiveModifiersAndButtons(event);
const modifierKeys = DocumentUtil.getActiveModifiers(event);
return this._getMatchingInputGroup(type, cause, modifiers, modifierKeys);
}
_getMatchingInputGroup(type, cause, modifiers, modifierKeys) {
let fallback = null;
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(type)) { continue; }
if (this._setHasAll(modifiersSet, include) && (exclude.length === 0 || !this._setHasAll(modifiersSet, exclude))) {
if (include.length > 0) {
return this._createInputInfo(i, false, input, type, cause, modifiers, modifierKeys);
} else if (fallback === null) {
fallback = this._createInputInfo(i, true, input, type, cause, modifiers, modifierKeys);
}
}
}
return fallback;
}
_createInputInfo(index, empty, input, type, cause, modifiers, modifierKeys) {
return {index, empty, input, type, cause, modifiers, modifierKeys};
}
_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;
}
}
}
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}