Changed javascript to be in its own file. Began (messy) setup for terminal.

1 files changed, 1399 insertions, 0 deletions

diff --git a/node_modules/xterm/src/browser/Terminal.ts b/node_modules/xterm/src/browser/Terminal.ts
new file mode 100644
index 0000000..fe5c7f7
--- /dev/null
+++ b/node_modules/xterm/src/browser/Terminal.ts
@@ -0,0 +1,1399 @@
+/**
+ * Copyright (c) 2014 The xterm.js authors. All rights reserved.
+ * Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
+ * @license MIT
+ *
+ * Originally forked from (with the author's permission):
+ *   Fabrice Bellard's javascript vt100 for jslinux:
+ *   http://bellard.org/jslinux/
+ *   Copyright (c) 2011 Fabrice Bellard
+ *   The original design remains. The terminal itself
+ *   has been extended to include xterm CSI codes, among
+ *   other features.
+ *
+ * Terminal Emulation References:
+ *   http://vt100.net/
+ *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.txt
+ *   http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ *   http://invisible-island.net/vttest/
+ *   http://www.inwap.com/pdp10/ansicode.txt
+ *   http://linux.die.net/man/4/console_codes
+ *   http://linux.die.net/man/7/urxvt
+ */
+
+import { ICompositionHelper, ITerminal, IBrowser, CustomKeyEventHandler, ILinkifier, IMouseZoneManager, LinkMatcherHandler, ILinkMatcherOptions, IViewport, ILinkifier2, CharacterJoinerHandler } from 'browser/Types';
+import { IRenderer } from 'browser/renderer/Types';
+import { CompositionHelper } from 'browser/input/CompositionHelper';
+import { Viewport } from 'browser/Viewport';
+import { rightClickHandler, moveTextAreaUnderMouseCursor, handlePasteEvent, copyHandler, paste } from 'browser/Clipboard';
+import { C0 } from 'common/data/EscapeSequences';
+import { WindowsOptionsReportType } from '../common/InputHandler';
+import { Renderer } from 'browser/renderer/Renderer';
+import { Linkifier } from 'browser/Linkifier';
+import { SelectionService } from 'browser/services/SelectionService';
+import * as Browser from 'common/Platform';
+import { addDisposableDomListener } from 'browser/Lifecycle';
+import * as Strings from 'browser/LocalizableStrings';
+import { SoundService } from 'browser/services/SoundService';
+import { MouseZoneManager } from 'browser/MouseZoneManager';
+import { AccessibilityManager } from './AccessibilityManager';
+import { ITheme, IMarker, IDisposable, ISelectionPosition, ILinkProvider } from 'xterm';
+import { DomRenderer } from 'browser/renderer/dom/DomRenderer';
+import { KeyboardResultType, CoreMouseEventType, CoreMouseButton, CoreMouseAction, ITerminalOptions, ScrollSource, IColorEvent, ColorIndex, ColorRequestType } from 'common/Types';
+import { evaluateKeyboardEvent } from 'common/input/Keyboard';
+import { EventEmitter, IEvent, forwardEvent } from 'common/EventEmitter';
+import { DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
+import { ColorManager } from 'browser/ColorManager';
+import { RenderService } from 'browser/services/RenderService';
+import { ICharSizeService, IRenderService, IMouseService, ISelectionService, ISoundService, ICoreBrowserService, ICharacterJoinerService } from 'browser/services/Services';
+import { CharSizeService } from 'browser/services/CharSizeService';
+import { IBuffer } from 'common/buffer/Types';
+import { MouseService } from 'browser/services/MouseService';
+import { Linkifier2 } from 'browser/Linkifier2';
+import { CoreBrowserService } from 'browser/services/CoreBrowserService';
+import { CoreTerminal } from 'common/CoreTerminal';
+import { color, rgba } from 'browser/Color';
+import { CharacterJoinerService } from 'browser/services/CharacterJoinerService';
+import { toRgbString } from 'common/input/XParseColor';
+
+// Let it work inside Node.js for automated testing purposes.
+const document: Document = (typeof window !== 'undefined') ? window.document : null as any;
+
+export class Terminal extends CoreTerminal implements ITerminal {
+  public textarea: HTMLTextAreaElement | undefined;
+  public element: HTMLElement | undefined;
+  public screenElement: HTMLElement | undefined;
+
+  private _document: Document | undefined;
+  private _viewportScrollArea: HTMLElement | undefined;
+  private _viewportElement: HTMLElement | undefined;
+  private _helperContainer: HTMLElement | undefined;
+  private _compositionView: HTMLElement | undefined;
+
+  // private _visualBellTimer: number;
+
+  public browser: IBrowser = Browser as any;
+
+  private _customKeyEventHandler: CustomKeyEventHandler | undefined;
+
+  // browser services
+  private _charSizeService: ICharSizeService | undefined;
+  private _mouseService: IMouseService | undefined;
+  private _renderService: IRenderService | undefined;
+  private _characterJoinerService: ICharacterJoinerService | undefined;
+  private _selectionService: ISelectionService | undefined;
+  private _soundService: ISoundService | undefined;
+
+  /**
+   * Records whether the keydown event has already been handled and triggered a data event, if so
+   * the keypress event should not trigger a data event but should still print to the textarea so
+   * screen readers will announce it.
+   */
+  private _keyDownHandled: boolean = false;
+
+  /**
+   * Records whether the keypress event has already been handled and triggered a data event, if so
+   * the input event should not trigger a data event but should still print to the textarea so
+   * screen readers will announce it.
+   */
+  private _keyPressHandled: boolean = false;
+
+  /**
+   * Records whether there has been a keydown event for a dead key without a corresponding keydown
+   * event for the composed/alternative character. If we cancel the keydown event for the dead key,
+   * no events will be emitted for the final character.
+   */
+  private _unprocessedDeadKey: boolean = false;
+
+  public linkifier: ILinkifier;
+  public linkifier2: ILinkifier2;
+  public viewport: IViewport | undefined;
+  private _compositionHelper: ICompositionHelper | undefined;
+  private _mouseZoneManager: IMouseZoneManager | undefined;
+  private _accessibilityManager: AccessibilityManager | undefined;
+  private _colorManager: ColorManager | undefined;
+  private _theme: ITheme | undefined;
+
+  private _onCursorMove = new EventEmitter<void>();
+  public get onCursorMove(): IEvent<void> { return this._onCursorMove.event; }
+  private _onKey = new EventEmitter<{ key: string, domEvent: KeyboardEvent }>();
+  public get onKey(): IEvent<{ key: string, domEvent: KeyboardEvent }> { return this._onKey.event; }
+  private _onRender = new EventEmitter<{ start: number, end: number }>();
+  public get onRender(): IEvent<{ start: number, end: number }> { return this._onRender.event; }
+  private _onSelectionChange = new EventEmitter<void>();
+  public get onSelectionChange(): IEvent<void> { return this._onSelectionChange.event; }
+  private _onTitleChange = new EventEmitter<string>();
+  public get onTitleChange(): IEvent<string> { return this._onTitleChange.event; }
+  private _onBell = new EventEmitter<void>();
+  public get onBell(): IEvent<void> { return this._onBell.event; }
+
+  private _onFocus = new EventEmitter<void>();
+  public get onFocus(): IEvent<void> { return this._onFocus.event; }
+  private _onBlur = new EventEmitter<void>();
+  public get onBlur(): IEvent<void> { return this._onBlur.event; }
+  private _onA11yCharEmitter = new EventEmitter<string>();
+  public get onA11yChar(): IEvent<string> { return this._onA11yCharEmitter.event; }
+  private _onA11yTabEmitter = new EventEmitter<number>();
+  public get onA11yTab(): IEvent<number> { return this._onA11yTabEmitter.event; }
+
+  /**
+   * Creates a new `Terminal` object.
+   *
+   * @param options An object containing a set of options, the available options are:
+   *   - `cursorBlink` (boolean): Whether the terminal cursor blinks
+   *   - `cols` (number): The number of columns of the terminal (horizontal size)
+   *   - `rows` (number): The number of rows of the terminal (vertical size)
+   *
+   * @public
+   * @class Xterm Xterm
+   * @alias module:xterm/src/xterm
+   */
+  constructor(
+    options: Partial<ITerminalOptions> = {}
+  ) {
+    super(options);
+
+    this._setup();
+
+    this.linkifier = this._instantiationService.createInstance(Linkifier);
+    this.linkifier2 = this.register(this._instantiationService.createInstance(Linkifier2));
+
+    // Setup InputHandler listeners
+    this.register(this._inputHandler.onRequestBell(() => this.bell()));
+    this.register(this._inputHandler.onRequestRefreshRows((start, end) => this.refresh(start, end)));
+    this.register(this._inputHandler.onRequestSendFocus(() => this._reportFocus()));
+    this.register(this._inputHandler.onRequestReset(() => this.reset()));
+    this.register(this._inputHandler.onRequestWindowsOptionsReport(type => this._reportWindowsOptions(type)));
+    this.register(this._inputHandler.onColor((event) => this._handleColorEvent(event)));
+    this.register(forwardEvent(this._inputHandler.onCursorMove, this._onCursorMove));
+    this.register(forwardEvent(this._inputHandler.onTitleChange, this._onTitleChange));
+    this.register(forwardEvent(this._inputHandler.onA11yChar, this._onA11yCharEmitter));
+    this.register(forwardEvent(this._inputHandler.onA11yTab, this._onA11yTabEmitter));
+
+    // Setup listeners
+    this.register(this._bufferService.onResize(e => this._afterResize(e.cols, e.rows)));
+  }
+
+  /**
+   * Handle color event from inputhandler for OSC 4|104 | 10|110 | 11|111 | 12|112.
+   * An event from OSC 4|104 may contain multiple set or report requests, and multiple
+   * or none restore requests (resetting all),
+   * while an event from OSC 10|110 | 11|111 | 12|112 always contains a single request.
+   */
+  private _handleColorEvent(event: IColorEvent): void {
+    if (!this._colorManager) return;
+    for (const req of event) {
+      let acc: 'foreground' | 'background' | 'cursor' | 'ansi' | undefined = undefined;
+      let ident = '';
+      switch (req.index) {
+        case ColorIndex.FOREGROUND: // OSC 10 | 110
+          acc = 'foreground';
+          ident = '10';
+          break;
+        case ColorIndex.BACKGROUND: // OSC 11 | 111
+          acc = 'background';
+          ident = '11';
+          break;
+        case ColorIndex.CURSOR: // OSC 12 | 112
+          acc = 'cursor';
+          ident = '12';
+          break;
+        default: // OSC 4 | 104
+          // we can skip the [0..255] range check here (already done in inputhandler)
+          acc = 'ansi';
+          ident = '4;' + req.index;
+      }
+      if (acc) {
+        switch (req.type) {
+          case ColorRequestType.REPORT:
+            const channels = color.toColorRGB(acc === 'ansi'
+              ? this._colorManager.colors.ansi[req.index]
+              : this._colorManager.colors[acc]);
+            this.coreService.triggerDataEvent(`${C0.ESC}]${ident};${toRgbString(channels)}${C0.BEL}`);
+            break;
+          case ColorRequestType.SET:
+            if (acc === 'ansi') this._colorManager.colors.ansi[req.index] = rgba.toColor(...req.color);
+            else this._colorManager.colors[acc] = rgba.toColor(...req.color);
+            break;
+          case ColorRequestType.RESTORE:
+            this._colorManager.restoreColor(req.index);
+            break;
+        }
+      }
+    }
+    this._renderService?.setColors(this._colorManager.colors);
+    this.viewport?.onThemeChange(this._colorManager.colors);
+  }
+
+  public dispose(): void {
+    if (this._isDisposed) {
+      return;
+    }
+    super.dispose();
+    this._renderService?.dispose();
+    this._customKeyEventHandler = undefined;
+    this.write = () => { };
+    this.element?.parentNode?.removeChild(this.element);
+  }
+
+  protected _setup(): void {
+    super._setup();
+
+    this._customKeyEventHandler = undefined;
+  }
+
+  /**
+   * Convenience property to active buffer.
+   */
+  public get buffer(): IBuffer {
+    return this.buffers.active;
+  }
+
+  /**
+   * Focus the terminal. Delegates focus handling to the terminal's DOM element.
+   */
+  public focus(): void {
+    if (this.textarea) {
+      this.textarea.focus({ preventScroll: true });
+    }
+  }
+
+  protected _updateOptions(key: string): void {
+    super._updateOptions(key);
+
+    // TODO: These listeners should be owned by individual components
+    switch (key) {
+      case 'fontFamily':
+      case 'fontSize':
+        // When the font changes the size of the cells may change which requires a renderer clear
+        this._renderService?.clear();
+        this._charSizeService?.measure();
+        break;
+      case 'cursorBlink':
+      case 'cursorStyle':
+        // The DOM renderer needs a row refresh to update the cursor styles
+        this.refresh(this.buffer.y, this.buffer.y);
+        break;
+      case 'customGlyphs':
+      case 'drawBoldTextInBrightColors':
+      case 'letterSpacing':
+      case 'lineHeight':
+      case 'fontWeight':
+      case 'fontWeightBold':
+      case 'minimumContrastRatio':
+        // When the font changes the size of the cells may change which requires a renderer clear
+        if (this._renderService) {
+          this._renderService.clear();
+          this._renderService.onResize(this.cols, this.rows);
+          this.refresh(0, this.rows - 1);
+        }
+        break;
+      case 'rendererType':
+        if (this._renderService) {
+          this._renderService.setRenderer(this._createRenderer());
+          this._renderService.onResize(this.cols, this.rows);
+        }
+        break;
+      case 'scrollback':
+        this.viewport?.syncScrollArea();
+        break;
+      case 'screenReaderMode':
+        if (this.optionsService.rawOptions.screenReaderMode) {
+          if (!this._accessibilityManager && this._renderService) {
+            this._accessibilityManager = new AccessibilityManager(this, this._renderService);
+          }
+        } else {
+          this._accessibilityManager?.dispose();
+          this._accessibilityManager = undefined;
+        }
+        break;
+      case 'tabStopWidth': this.buffers.setupTabStops(); break;
+      case 'theme':
+        this._setTheme(this.optionsService.rawOptions.theme);
+        break;
+    }
+  }
+
+  /**
+   * Binds the desired focus behavior on a given terminal object.
+   */
+  private _onTextAreaFocus(ev: KeyboardEvent): void {
+    if (this.coreService.decPrivateModes.sendFocus) {
+      this.coreService.triggerDataEvent(C0.ESC + '[I');
+    }
+    this.updateCursorStyle(ev);
+    this.element!.classList.add('focus');
+    this._showCursor();
+    this._onFocus.fire();
+  }
+
+  /**
+   * Blur the terminal, calling the blur function on the terminal's underlying
+   * textarea.
+   */
+  public blur(): void {
+    return this.textarea?.blur();
+  }
+
+  /**
+   * Binds the desired blur behavior on a given terminal object.
+   */
+  private _onTextAreaBlur(): void {
+    // Text can safely be removed on blur. Doing it earlier could interfere with
+    // screen readers reading it out.
+    this.textarea!.value = '';
+    this.refresh(this.buffer.y, this.buffer.y);
+    if (this.coreService.decPrivateModes.sendFocus) {
+      this.coreService.triggerDataEvent(C0.ESC + '[O');
+    }
+    this.element!.classList.remove('focus');
+    this._onBlur.fire();
+  }
+
+  private _syncTextArea(): void {
+    if (!this.textarea || !this.buffer.isCursorInViewport || this._compositionHelper!.isComposing || !this._renderService) {
+      return;
+    }
+    const cursorY = this.buffer.ybase + this.buffer.y;
+    const bufferLine = this.buffer.lines.get(cursorY);
+    if (!bufferLine) {
+      return;
+    }
+    const cursorX = Math.min(this.buffer.x, this.cols - 1);
+    const cellHeight = this._renderService.dimensions.actualCellHeight;
+    const width = bufferLine.getWidth(cursorX);
+    const cellWidth = this._renderService.dimensions.actualCellWidth * width;
+    const cursorTop = this.buffer.y * this._renderService.dimensions.actualCellHeight;
+    const cursorLeft = cursorX * this._renderService.dimensions.actualCellWidth;
+
+    // Sync the textarea to the exact position of the composition view so the IME knows where the
+    // text is.
+    this.textarea.style.left = cursorLeft + 'px';
+    this.textarea.style.top = cursorTop + 'px';
+    this.textarea.style.width = cellWidth + 'px';
+    this.textarea.style.height = cellHeight + 'px';
+    this.textarea.style.lineHeight = cellHeight + 'px';
+    this.textarea.style.zIndex = '-5';
+  }
+
+  /**
+   * Initialize default behavior
+   */
+  private _initGlobal(): void {
+    this._bindKeys();
+
+    // Bind clipboard functionality
+    this.register(addDisposableDomListener(this.element!, 'copy', (event: ClipboardEvent) => {
+      // If mouse events are active it means the selection manager is disabled and
+      // copy should be handled by the host program.
+      if (!this.hasSelection()) {
+        return;
+      }
+      copyHandler(event, this._selectionService!);
+    }));
+    const pasteHandlerWrapper = (event: ClipboardEvent): void => handlePasteEvent(event, this.textarea!, this.coreService);
+    this.register(addDisposableDomListener(this.textarea!, 'paste', pasteHandlerWrapper));
+    this.register(addDisposableDomListener(this.element!, 'paste', pasteHandlerWrapper));
+
+    // Handle right click context menus
+    if (Browser.isFirefox) {
+      // Firefox doesn't appear to fire the contextmenu event on right click
+      this.register(addDisposableDomListener(this.element!, 'mousedown', (event: MouseEvent) => {
+        if (event.button === 2) {
+          rightClickHandler(event, this.textarea!, this.screenElement!, this._selectionService!, this.options.rightClickSelectsWord);
+        }
+      }));
+    } else {
+      this.register(addDisposableDomListener(this.element!, 'contextmenu', (event: MouseEvent) => {
+        rightClickHandler(event, this.textarea!, this.screenElement!, this._selectionService!, this.options.rightClickSelectsWord);
+      }));
+    }
+
+    // Move the textarea under the cursor when middle clicking on Linux to ensure
+    // middle click to paste selection works. This only appears to work in Chrome
+    // at the time is writing.
+    if (Browser.isLinux) {
+      // Use auxclick event over mousedown the latter doesn't seem to work. Note
+      // that the regular click event doesn't fire for the middle mouse button.
+      this.register(addDisposableDomListener(this.element!, 'auxclick', (event: MouseEvent) => {
+        if (event.button === 1) {
+          moveTextAreaUnderMouseCursor(event, this.textarea!, this.screenElement!);
+        }
+      }));
+    }
+  }
+
+  /**
+   * Apply key handling to the terminal
+   */
+  private _bindKeys(): void {
+    this.register(addDisposableDomListener(this.textarea!, 'keyup', (ev: KeyboardEvent) => this._keyUp(ev), true));
+    this.register(addDisposableDomListener(this.textarea!, 'keydown', (ev: KeyboardEvent) => this._keyDown(ev), true));
+    this.register(addDisposableDomListener(this.textarea!, 'keypress', (ev: KeyboardEvent) => this._keyPress(ev), true));
+    this.register(addDisposableDomListener(this.textarea!, 'compositionstart', () => this._compositionHelper!.compositionstart()));
+    this.register(addDisposableDomListener(this.textarea!, 'compositionupdate', (e: CompositionEvent) => this._compositionHelper!.compositionupdate(e)));
+    this.register(addDisposableDomListener(this.textarea!, 'compositionend', () => this._compositionHelper!.compositionend()));
+    this.register(addDisposableDomListener(this.textarea!, 'input', (ev: InputEvent) => this._inputEvent(ev), true));
+    this.register(this.onRender(() => this._compositionHelper!.updateCompositionElements()));
+    this.register(this.onRender(e => this._queueLinkification(e.start, e.end)));
+  }
+
+  /**
+   * Opens the terminal within an element.
+   *
+   * @param parent The element to create the terminal within.
+   */
+  public open(parent: HTMLElement): void {
+    if (!parent) {
+      throw new Error('Terminal requires a parent element.');
+    }
+
+    if (!parent.isConnected) {
+      this._logService.debug('Terminal.open was called on an element that was not attached to the DOM');
+    }
+
+    this._document = parent.ownerDocument!;
+
+    // Create main element container
+    this.element = this._document.createElement('div');
+    this.element.dir = 'ltr';   // xterm.css assumes LTR
+    this.element.classList.add('terminal');
+    this.element.classList.add('xterm');
+    this.element.setAttribute('tabindex', '0');
+    parent.appendChild(this.element);
+
+    // Performance: Use a document fragment to build the terminal
+    // viewport and helper elements detached from the DOM
+    const fragment = document.createDocumentFragment();
+    this._viewportElement = document.createElement('div');
+    this._viewportElement.classList.add('xterm-viewport');
+    fragment.appendChild(this._viewportElement);
+    this._viewportScrollArea = document.createElement('div');
+    this._viewportScrollArea.classList.add('xterm-scroll-area');
+    this._viewportElement.appendChild(this._viewportScrollArea);
+
+    this.screenElement = document.createElement('div');
+    this.screenElement.classList.add('xterm-screen');
+    // Create the container that will hold helpers like the textarea for
+    // capturing DOM Events. Then produce the helpers.
+    this._helperContainer = document.createElement('div');
+    this._helperContainer.classList.add('xterm-helpers');
+    this.screenElement.appendChild(this._helperContainer);
+    fragment.appendChild(this.screenElement);
+
+    this.textarea = document.createElement('textarea');
+    this.textarea.classList.add('xterm-helper-textarea');
+    this.textarea.setAttribute('aria-label', Strings.promptLabel);
+    this.textarea.setAttribute('aria-multiline', 'false');
+    this.textarea.setAttribute('autocorrect', 'off');
+    this.textarea.setAttribute('autocapitalize', 'off');
+    this.textarea.setAttribute('spellcheck', 'false');
+    this.textarea.tabIndex = 0;
+    this.register(addDisposableDomListener(this.textarea, 'focus', (ev: KeyboardEvent) => this._onTextAreaFocus(ev)));
+    this.register(addDisposableDomListener(this.textarea, 'blur', () => this._onTextAreaBlur()));
+    this._helperContainer.appendChild(this.textarea);
+
+    const coreBrowserService = this._instantiationService.createInstance(CoreBrowserService, this.textarea);
+    this._instantiationService.setService(ICoreBrowserService, coreBrowserService);
+
+    this._charSizeService = this._instantiationService.createInstance(CharSizeService, this._document, this._helperContainer);
+    this._instantiationService.setService(ICharSizeService, this._charSizeService);
+
+    this._theme = this.options.theme || this._theme;
+    this._colorManager = new ColorManager(document, this.options.allowTransparency);
+    this.register(this.optionsService.onOptionChange(e => this._colorManager!.onOptionsChange(e)));
+    this._colorManager.setTheme(this._theme);
+
+    this._characterJoinerService = this._instantiationService.createInstance(CharacterJoinerService);
+    this._instantiationService.setService(ICharacterJoinerService, this._characterJoinerService);
+
+    const renderer = this._createRenderer();
+    this._renderService = this.register(this._instantiationService.createInstance(RenderService, renderer, this.rows, this.screenElement));
+    this._instantiationService.setService(IRenderService, this._renderService);
+    this.register(this._renderService.onRenderedBufferChange(e => this._onRender.fire(e)));
+    this.onResize(e => this._renderService!.resize(e.cols, e.rows));
+
+    this._compositionView = document.createElement('div');
+    this._compositionView.classList.add('composition-view');
+    this._compositionHelper = this._instantiationService.createInstance(CompositionHelper, this.textarea, this._compositionView);
+    this._helperContainer.appendChild(this._compositionView);
+
+    // Performance: Add viewport and helper elements from the fragment
+    this.element.appendChild(fragment);
+
+    this._soundService = this._instantiationService.createInstance(SoundService);
+    this._instantiationService.setService(ISoundService, this._soundService);
+    this._mouseService = this._instantiationService.createInstance(MouseService);
+    this._instantiationService.setService(IMouseService, this._mouseService);
+
+    this.viewport = this._instantiationService.createInstance(Viewport,
+      (amount: number) => this.scrollLines(amount, true, ScrollSource.VIEWPORT),
+      this._viewportElement,
+      this._viewportScrollArea,
+      this.element
+    );
+    this.viewport.onThemeChange(this._colorManager.colors);
+    this.register(this._inputHandler.onRequestSyncScrollBar(() => this.viewport!.syncScrollArea()));
+    this.register(this.viewport);
+
+    this.register(this.onCursorMove(() => {
+      this._renderService!.onCursorMove();
+      this._syncTextArea();
+    }));
+    this.register(this.onResize(() => this._renderService!.onResize(this.cols, this.rows)));
+    this.register(this.onBlur(() => this._renderService!.onBlur()));
+    this.register(this.onFocus(() => this._renderService!.onFocus()));
+    this.register(this._renderService.onDimensionsChange(() => this.viewport!.syncScrollArea()));
+
+    this._selectionService = this.register(this._instantiationService.createInstance(SelectionService,
+      this.element,
+      this.screenElement,
+      this.linkifier2
+    ));
+    this._instantiationService.setService(ISelectionService, this._selectionService);
+    this.register(this._selectionService.onRequestScrollLines(e => this.scrollLines(e.amount, e.suppressScrollEvent)));
+    this.register(this._selectionService.onSelectionChange(() => this._onSelectionChange.fire()));
+    this.register(this._selectionService.onRequestRedraw(e => this._renderService!.onSelectionChanged(e.start, e.end, e.columnSelectMode)));
+    this.register(this._selectionService.onLinuxMouseSelection(text => {
+      // If there's a new selection, put it into the textarea, focus and select it
+      // in order to register it as a selection on the OS. This event is fired
+      // only on Linux to enable middle click to paste selection.
+      this.textarea!.value = text;
+      this.textarea!.focus();
+      this.textarea!.select();
+    }));
+    this.register(this._onScroll.event(ev => {
+      this.viewport!.syncScrollArea();
+      this._selectionService!.refresh();
+    }));
+    this.register(addDisposableDomListener(this._viewportElement, 'scroll', () => this._selectionService!.refresh()));
+
+    this._mouseZoneManager = this._instantiationService.createInstance(MouseZoneManager, this.element, this.screenElement);
+    this.register(this._mouseZoneManager);
+    this.register(this.onScroll(() => this._mouseZoneManager!.clearAll()));
+    this.linkifier.attachToDom(this.element, this._mouseZoneManager);
+    this.linkifier2.attachToDom(this.screenElement, this._mouseService, this._renderService);
+
+    // This event listener must be registered aftre MouseZoneManager is created
+    this.register(addDisposableDomListener(this.element, 'mousedown', (e: MouseEvent) => this._selectionService!.onMouseDown(e)));
+
+    // apply mouse event classes set by escape codes before terminal was attached
+    if (this.coreMouseService.areMouseEventsActive) {
+      this._selectionService.disable();
+      this.element.classList.add('enable-mouse-events');
+    } else {
+      this._selectionService.enable();
+    }
+
+    if (this.options.screenReaderMode) {
+      // Note that this must be done *after* the renderer is created in order to
+      // ensure the correct order of the dprchange event
+      this._accessibilityManager = new AccessibilityManager(this, this._renderService);
+    }
+
+    // Measure the character size
+    this._charSizeService.measure();
+
+    // Setup loop that draws to screen
+    this.refresh(0, this.rows - 1);
+
+    // Initialize global actions that need to be taken on the document.
+    this._initGlobal();
+
+    // Listen for mouse events and translate
+    // them into terminal mouse protocols.
+    this.bindMouse();
+  }
+
+  private _createRenderer(): IRenderer {
+    switch (this.options.rendererType) {
+      case 'canvas': return this._instantiationService.createInstance(Renderer, this._colorManager!.colors, this.screenElement!, this.linkifier, this.linkifier2);
+      case 'dom': return this._instantiationService.createInstance(DomRenderer, this._colorManager!.colors, this.element!, this.screenElement!, this._viewportElement!, this.linkifier, this.linkifier2);
+      default: throw new Error(`Unrecognized rendererType "${this.options.rendererType}"`);
+    }
+  }
+
+  /**
+   * Sets the theme on the renderer. The renderer must have been initialized.
+   * @param theme The theme to set.
+   */
+  private _setTheme(theme: ITheme): void {
+    this._theme = theme;
+    this._colorManager?.setTheme(theme);
+    this._renderService?.setColors(this._colorManager!.colors);
+    this.viewport?.onThemeChange(this._colorManager!.colors);
+  }
+
+  /**
+   * Bind certain mouse events to the terminal.
+   * By default only 3 button + wheel up/down is ativated. For higher buttons
+   * no mouse report will be created. Typically the standard actions will be active.
+   *
+   * There are several reasons not to enable support for higher buttons/wheel:
+   * - Button 4 and 5 are typically used for history back and forward navigation,
+   *   there is no straight forward way to supress/intercept those standard actions.
+   * - Support for higher buttons does not work in some platform/browser combinations.
+   * - Left/right wheel was not tested.
+   * - Emulators vary in mouse button support, typically only 3 buttons and
+   *   wheel up/down work reliable.
+   *
+   * TODO: Move mouse event code into its own file.
+   */
+  public bindMouse(): void {
+    const self = this;
+    const el = this.element!;
+
+    // send event to CoreMouseService
+    function sendEvent(ev: MouseEvent | WheelEvent): boolean {
+      // get mouse coordinates
+      const pos = self._mouseService!.getRawByteCoords(ev, self.screenElement!, self.cols, self.rows);
+      if (!pos) {
+        return false;
+      }
+
+      let but: CoreMouseButton;
+      let action: CoreMouseAction | undefined;
+      switch ((ev as any).overrideType || ev.type) {
+        case 'mousemove':
+          action = CoreMouseAction.MOVE;
+          if (ev.buttons === undefined) {
+            // buttons is not supported on macOS, try to get a value from button instead
+            but = CoreMouseButton.NONE;
+            if (ev.button !== undefined) {
+              but = ev.button < 3 ? ev.button : CoreMouseButton.NONE;
+            }
+          } else {
+            // according to MDN buttons only reports up to button 5 (AUX2)
+            but = ev.buttons & 1 ? CoreMouseButton.LEFT :
+              ev.buttons & 4 ? CoreMouseButton.MIDDLE :
+                ev.buttons & 2 ? CoreMouseButton.RIGHT :
+                  CoreMouseButton.NONE; // fallback to NONE
+          }
+          break;
+        case 'mouseup':
+          action = CoreMouseAction.UP;
+          but = ev.button < 3 ? ev.button : CoreMouseButton.NONE;
+          break;
+        case 'mousedown':
+          action = CoreMouseAction.DOWN;
+          but = ev.button < 3 ? ev.button : CoreMouseButton.NONE;
+          break;
+        case 'wheel':
+          // only UP/DOWN wheel events are respected
+          if ((ev as WheelEvent).deltaY !== 0) {
+            action = (ev as WheelEvent).deltaY < 0 ? CoreMouseAction.UP : CoreMouseAction.DOWN;
+          }
+          but = CoreMouseButton.WHEEL;
+          break;
+        default:
+          // dont handle other event types by accident
+          return false;
+      }
+
+      // exit if we cannot determine valid button/action values
+      // do nothing for higher buttons than wheel
+      if (action === undefined || but === undefined || but > CoreMouseButton.WHEEL) {
+        return false;
+      }
+
+      return self.coreMouseService.triggerMouseEvent({
+        col: pos.x - 33, // FIXME: why -33 here?
+        row: pos.y - 33,
+        button: but,
+        action,
+        ctrl: ev.ctrlKey,
+        alt: ev.altKey,
+        shift: ev.shiftKey
+      });
+    }
+
+    /**
+     * Event listener state handling.
+     * We listen to the onProtocolChange event of CoreMouseService and put
+     * requested listeners in `requestedEvents`. With this the listeners
+     * have all bits to do the event listener juggling.
+     * Note: 'mousedown' currently is "always on" and not managed
+     * by onProtocolChange.
+     */
+    const requestedEvents: { [key: string]: ((ev: Event) => void) | null } = {
+      mouseup: null,
+      wheel: null,
+      mousedrag: null,
+      mousemove: null
+    };
+    const eventListeners: { [key: string]: (ev: any) => void | boolean } = {
+      mouseup: (ev: MouseEvent) => {
+        sendEvent(ev);
+        if (!ev.buttons) {
+          // if no other button is held remove global handlers
+          this._document!.removeEventListener('mouseup', requestedEvents.mouseup!);
+          if (requestedEvents.mousedrag) {
+            this._document!.removeEventListener('mousemove', requestedEvents.mousedrag);
+          }
+        }
+        return this.cancel(ev);
+      },
+      wheel: (ev: WheelEvent) => {
+        sendEvent(ev);
+        return this.cancel(ev, true);
+      },
+      mousedrag: (ev: MouseEvent) => {
+        // deal only with move while a button is held
+        if (ev.buttons) {
+          sendEvent(ev);
+        }
+      },
+      mousemove: (ev: MouseEvent) => {
+        // deal only with move without any button
+        if (!ev.buttons) {
+          sendEvent(ev);
+        }
+      }
+    };
+    this.register(this.coreMouseService.onProtocolChange(events => {
+      // apply global changes on events
+      if (events) {
+        if (this.optionsService.rawOptions.logLevel === 'debug') {
+          this._logService.debug('Binding to mouse events:', this.coreMouseService.explainEvents(events));
+        }
+        this.element!.classList.add('enable-mouse-events');
+        this._selectionService!.disable();
+      } else {
+        this._logService.debug('Unbinding from mouse events.');
+        this.element!.classList.remove('enable-mouse-events');
+        this._selectionService!.enable();
+      }
+
+      // add/remove handlers from requestedEvents
+
+      if (!(events & CoreMouseEventType.MOVE)) {
+        el.removeEventListener('mousemove', requestedEvents.mousemove!);
+        requestedEvents.mousemove = null;
+      } else if (!requestedEvents.mousemove) {
+        el.addEventListener('mousemove', eventListeners.mousemove);
+        requestedEvents.mousemove = eventListeners.mousemove;
+      }
+
+      if (!(events & CoreMouseEventType.WHEEL)) {
+        el.removeEventListener('wheel', requestedEvents.wheel!);
+        requestedEvents.wheel = null;
+      } else if (!requestedEvents.wheel) {
+        el.addEventListener('wheel', eventListeners.wheel, { passive: false });
+        requestedEvents.wheel = eventListeners.wheel;
+      }
+
+      if (!(events & CoreMouseEventType.UP)) {
+        this._document!.removeEventListener('mouseup', requestedEvents.mouseup!);
+        requestedEvents.mouseup = null;
+      } else if (!requestedEvents.mouseup) {
+        requestedEvents.mouseup = eventListeners.mouseup;
+      }
+
+      if (!(events & CoreMouseEventType.DRAG)) {
+        this._document!.removeEventListener('mousemove', requestedEvents.mousedrag!);
+        requestedEvents.mousedrag = null;
+      } else if (!requestedEvents.mousedrag) {
+        requestedEvents.mousedrag = eventListeners.mousedrag;
+      }
+    }));
+    // force initial onProtocolChange so we dont miss early mouse requests
+    this.coreMouseService.activeProtocol = this.coreMouseService.activeProtocol;
+
+    /**
+     * "Always on" event listeners.
+     */
+    this.register(addDisposableDomListener(el, 'mousedown', (ev: MouseEvent) => {
+      ev.preventDefault();
+      this.focus();
+
+      // Don't send the mouse button to the pty if mouse events are disabled or
+      // if the selection manager is having selection forced (ie. a modifier is
+      // held).
+      if (!this.coreMouseService.areMouseEventsActive || this._selectionService!.shouldForceSelection(ev)) {
+        return;
+      }
+
+      sendEvent(ev);
+
+      // Register additional global handlers which should keep reporting outside
+      // of the terminal element.
+      // Note: Other emulators also do this for 'mousedown' while a button
+      // is held, we currently limit 'mousedown' to the terminal only.
+      if (requestedEvents.mouseup) {
+        this._document!.addEventListener('mouseup', requestedEvents.mouseup);
+      }
+      if (requestedEvents.mousedrag) {
+        this._document!.addEventListener('mousemove', requestedEvents.mousedrag);
+      }
+
+      return this.cancel(ev);
+    }));
+
+    this.register(addDisposableDomListener(el, 'wheel', (ev: WheelEvent) => {
+      // do nothing, if app side handles wheel itself
+      if (requestedEvents.wheel) return;
+
+      if (!this.buffer.hasScrollback) {
+        // Convert wheel events into up/down events when the buffer does not have scrollback, this
+        // enables scrolling in apps hosted in the alt buffer such as vim or tmux.
+        const amount = this.viewport!.getLinesScrolled(ev);
+
+        // Do nothing if there's no vertical scroll
+        if (amount === 0) {
+          return;
+        }
+
+        // Construct and send sequences
+        const sequence = C0.ESC + (this.coreService.decPrivateModes.applicationCursorKeys ? 'O' : '[') + (ev.deltaY < 0 ? 'A' : 'B');
+        let data = '';
+        for (let i = 0; i < Math.abs(amount); i++) {
+          data += sequence;
+        }
+        this.coreService.triggerDataEvent(data, true);
+        return this.cancel(ev, true);
+      }
+
+      // normal viewport scrolling
+      // conditionally stop event, if the viewport still had rows to scroll within
+      if (this.viewport!.onWheel(ev)) {
+        return this.cancel(ev);
+      }
+    }, { passive: false }));
+
+    this.register(addDisposableDomListener(el, 'touchstart', (ev: TouchEvent) => {
+      if (this.coreMouseService.areMouseEventsActive) return;
+      this.viewport!.onTouchStart(ev);
+      return this.cancel(ev);
+    }, { passive: true }));
+
+    this.register(addDisposableDomListener(el, 'touchmove', (ev: TouchEvent) => {
+      if (this.coreMouseService.areMouseEventsActive) return;
+      if (!this.viewport!.onTouchMove(ev)) {
+        return this.cancel(ev);
+      }
+    }, { passive: false }));
+  }
+
+
+  /**
+   * Tells the renderer to refresh terminal content between two rows (inclusive) at the next
+   * opportunity.
+   * @param start The row to start from (between 0 and this.rows - 1).
+   * @param end The row to end at (between start and this.rows - 1).
+   */
+  public refresh(start: number, end: number): void {
+    this._renderService?.refreshRows(start, end);
+  }
+
+  /**
+   * Queues linkification for the specified rows.
+   * @param start The row to start from (between 0 and this.rows - 1).
+   * @param end The row to end at (between start and this.rows - 1).
+   */
+  private _queueLinkification(start: number, end: number): void {
+    this.linkifier?.linkifyRows(start, end);
+  }
+
+  /**
+   * Change the cursor style for different selection modes
+   */
+  public updateCursorStyle(ev: KeyboardEvent): void {
+    if (this._selectionService?.shouldColumnSelect(ev)) {
+      this.element!.classList.add('column-select');
+    } else {
+      this.element!.classList.remove('column-select');
+    }
+  }
+
+  /**
+   * Display the cursor element
+   */
+  private _showCursor(): void {
+    if (!this.coreService.isCursorInitialized) {
+      this.coreService.isCursorInitialized = true;
+      this.refresh(this.buffer.y, this.buffer.y);
+    }
+  }
+
+  public scrollLines(disp: number, suppressScrollEvent?: boolean, source = ScrollSource.TERMINAL): void {
+    super.scrollLines(disp, suppressScrollEvent, source);
+    this.refresh(0, this.rows - 1);
+  }
+
+  public paste(data: string): void {
+    paste(data, this.textarea!, this.coreService);
+  }
+
+  /**
+   * Attaches a custom key event handler which is run before keys are processed,
+   * giving consumers of xterm.js ultimate control as to what keys should be
+   * processed by the terminal and what keys should not.
+   * @param customKeyEventHandler The custom KeyboardEvent handler to attach.
+   * This is a function that takes a KeyboardEvent, allowing consumers to stop
+   * propagation and/or prevent the default action. The function returns whether
+   * the event should be processed by xterm.js.
+   */
+  public attachCustomKeyEventHandler(customKeyEventHandler: CustomKeyEventHandler): void {
+    this._customKeyEventHandler = customKeyEventHandler;
+  }
+
+  /**
+   * Registers a link matcher, allowing custom link patterns to be matched and
+   * handled.
+   * @param regex The regular expression to search for, specifically
+   * this searches the textContent of the rows. You will want to use \s to match
+   * a space ' ' character for example.
+   * @param handler The callback when the link is called.
+   * @param options Options for the link matcher.
+   * @return The ID of the new matcher, this can be used to deregister.
+   */
+  public registerLinkMatcher(regex: RegExp, handler: LinkMatcherHandler, options?: ILinkMatcherOptions): number {
+    const matcherId = this.linkifier.registerLinkMatcher(regex, handler, options);
+    this.refresh(0, this.rows - 1);
+    return matcherId;
+  }
+
+  /**
+   * Deregisters a link matcher if it has been registered.
+   * @param matcherId The link matcher's ID (returned after register)
+   */
+  public deregisterLinkMatcher(matcherId: number): void {
+    if (this.linkifier.deregisterLinkMatcher(matcherId)) {
+      this.refresh(0, this.rows - 1);
+    }
+  }
+
+  public registerLinkProvider(linkProvider: ILinkProvider): IDisposable {
+    return this.linkifier2.registerLinkProvider(linkProvider);
+  }
+
+  public registerCharacterJoiner(handler: CharacterJoinerHandler): number {
+    if (!this._characterJoinerService) {
+      throw new Error('Terminal must be opened first');
+    }
+    const joinerId = this._characterJoinerService.register(handler);
+    this.refresh(0, this.rows - 1);
+    return joinerId;
+  }
+
+  public deregisterCharacterJoiner(joinerId: number): void {
+    if (!this._characterJoinerService) {
+      throw new Error('Terminal must be opened first');
+    }
+    if (this._characterJoinerService.deregister(joinerId)) {
+      this.refresh(0, this.rows - 1);
+    }
+  }
+
+  public get markers(): IMarker[] {
+    return this.buffer.markers;
+  }
+
+  public addMarker(cursorYOffset: number): IMarker | undefined {
+    // Disallow markers on the alt buffer
+    if (this.buffer !== this.buffers.normal) {
+      return;
+    }
+
+    return this.buffer.addMarker(this.buffer.ybase + this.buffer.y + cursorYOffset);
+  }
+
+  /**
+   * Gets whether the terminal has an active selection.
+   */
+  public hasSelection(): boolean {
+    return this._selectionService ? this._selectionService.hasSelection : false;
+  }
+
+  /**
+   * Selects text within the terminal.
+   * @param column The column the selection starts at..
+   * @param row The row the selection starts at.
+   * @param length The length of the selection.
+   */
+  public select(column: number, row: number, length: number): void {
+    this._selectionService!.setSelection(column, row, length);
+  }
+
+  /**
+   * Gets the terminal's current selection, this is useful for implementing copy
+   * behavior outside of xterm.js.
+   */
+  public getSelection(): string {
+    return this._selectionService ? this._selectionService.selectionText : '';
+  }
+
+  public getSelectionPosition(): ISelectionPosition | undefined {
+    if (!this._selectionService || !this._selectionService.hasSelection) {
+      return undefined;
+    }
+
+    return {
+      startColumn: this._selectionService.selectionStart![0],
+      startRow: this._selectionService.selectionStart![1],
+      endColumn: this._selectionService.selectionEnd![0],
+      endRow: this._selectionService.selectionEnd![1]
+    };
+  }
+
+  /**
+   * Clears the current terminal selection.
+   */
+  public clearSelection(): void {
+    this._selectionService?.clearSelection();
+  }
+
+  /**
+   * Selects all text within the terminal.
+   */
+  public selectAll(): void {
+    this._selectionService?.selectAll();
+  }
+
+  public selectLines(start: number, end: number): void {
+    this._selectionService?.selectLines(start, end);
+  }
+
+  /**
+   * Handle a keydown event
+   * Key Resources:
+   *   - https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
+   * @param ev The keydown event to be handled.
+   */
+  protected _keyDown(event: KeyboardEvent): boolean | undefined {
+    this._keyDownHandled = false;
+
+    if (this._customKeyEventHandler && this._customKeyEventHandler(event) === false) {
+      return false;
+    }
+
+    if (!this._compositionHelper!.keydown(event)) {
+      if (this.buffer.ybase !== this.buffer.ydisp) {
+        this._bufferService.scrollToBottom();
+      }
+      return false;
+    }
+
+    if (event.key === 'Dead' || event.key === 'AltGraph') {
+      this._unprocessedDeadKey = true;
+    }
+
+    const result = evaluateKeyboardEvent(event, this.coreService.decPrivateModes.applicationCursorKeys, this.browser.isMac, this.options.macOptionIsMeta);
+
+    this.updateCursorStyle(event);
+
+    if (result.type === KeyboardResultType.PAGE_DOWN || result.type === KeyboardResultType.PAGE_UP) {
+      const scrollCount = this.rows - 1;
+      this.scrollLines(result.type === KeyboardResultType.PAGE_UP ? -scrollCount : scrollCount);
+      return this.cancel(event, true);
+    }
+
+    if (result.type === KeyboardResultType.SELECT_ALL) {
+      this.selectAll();
+    }
+
+    if (this._isThirdLevelShift(this.browser, event)) {
+      return true;
+    }
+
+    if (result.cancel) {
+      // The event is canceled at the end already, is this necessary?
+      this.cancel(event, true);
+    }
+
+    if (!result.key) {
+      return true;
+    }
+
+    if (this._unprocessedDeadKey) {
+      this._unprocessedDeadKey = false;
+      return true;
+    }
+
+    // If ctrl+c or enter is being sent, clear out the textarea. This is done so that screen readers
+    // will announce deleted characters. This will not work 100% of the time but it should cover
+    // most scenarios.
+    if (result.key === C0.ETX || result.key === C0.CR) {
+      this.textarea!.value = '';
+    }
+
+    this._onKey.fire({ key: result.key, domEvent: event });
+    this._showCursor();
+    this.coreService.triggerDataEvent(result.key, true);
+
+    // Cancel events when not in screen reader mode so events don't get bubbled up and handled by
+    // other listeners. When screen reader mode is enabled, this could cause issues if the event
+    // is handled at a higher level, this is a compromise in order to echo keys to the screen
+    // reader.
+    if (!this.optionsService.rawOptions.screenReaderMode) {
+      return this.cancel(event, true);
+    }
+
+    this._keyDownHandled = true;
+  }
+
+  private _isThirdLevelShift(browser: IBrowser, ev: KeyboardEvent): boolean {
+    const thirdLevelKey =
+      (browser.isMac && !this.options.macOptionIsMeta && ev.altKey && !ev.ctrlKey && !ev.metaKey) ||
+      (browser.isWindows && ev.altKey && ev.ctrlKey && !ev.metaKey) ||
+      (browser.isWindows && ev.getModifierState('AltGraph'));
+
+    if (ev.type === 'keypress') {
+      return thirdLevelKey;
+    }
+
+    // Don't invoke for arrows, pageDown, home, backspace, etc. (on non-keypress events)
+    return thirdLevelKey && (!ev.keyCode || ev.keyCode > 47);
+  }
+
+  protected _keyUp(ev: KeyboardEvent): void {
+    if (this._customKeyEventHandler && this._customKeyEventHandler(ev) === false) {
+      return;
+    }
+
+    if (!wasModifierKeyOnlyEvent(ev)) {
+      this.focus();
+    }
+
+    this.updateCursorStyle(ev);
+    this._keyPressHandled = false;
+  }
+
+  /**
+   * Handle a keypress event.
+   * Key Resources:
+   *   - https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
+   * @param ev The keypress event to be handled.
+   */
+  protected _keyPress(ev: KeyboardEvent): boolean {
+    let key;
+
+    this._keyPressHandled = false;
+
+    if (this._keyDownHandled) {
+      return false;
+    }
+
+    if (this._customKeyEventHandler && this._customKeyEventHandler(ev) === false) {
+      return false;
+    }
+
+    this.cancel(ev);
+
+    if (ev.charCode) {
+      key = ev.charCode;
+    } else if (ev.which === null || ev.which === undefined) {
+      key = ev.keyCode;
+    } else if (ev.which !== 0 && ev.charCode !== 0) {
+      key = ev.which;
+    } else {
+      return false;
+    }
+
+    if (!key || (
+      (ev.altKey || ev.ctrlKey || ev.metaKey) && !this._isThirdLevelShift(this.browser, ev)
+    )) {
+      return false;
+    }
+
+    key = String.fromCharCode(key);
+
+    this._onKey.fire({ key, domEvent: ev });
+    this._showCursor();
+    this.coreService.triggerDataEvent(key, true);
+
+    this._keyPressHandled = true;
+
+    // The key was handled so clear the dead key state, otherwise certain keystrokes like arrow
+    // keys could be ignored
+    this._unprocessedDeadKey = false;
+
+    return true;
+  }
+
+  /**
+   * Handle an input event.
+   * Key Resources:
+   *   - https://developer.mozilla.org/en-US/docs/Web/API/InputEvent
+   * @param ev The input event to be handled.
+   */
+  protected _inputEvent(ev: InputEvent): boolean {
+    // Only support emoji IMEs when screen reader mode is disabled as the event must bubble up to
+    // support reading out character input which can doubling up input characters
+    if (ev.data && ev.inputType === 'insertText' && !ev.composed && !this.optionsService.rawOptions.screenReaderMode) {
+      if (this._keyPressHandled) {
+        return false;
+      }
+
+      // The key was handled so clear the dead key state, otherwise certain keystrokes like arrow
+      // keys could be ignored
+      this._unprocessedDeadKey = false;
+
+      const text = ev.data;
+      this.coreService.triggerDataEvent(text, true);
+
+      this.cancel(ev);
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Ring the bell.
+   * Note: We could do sweet things with webaudio here
+   */
+  public bell(): void {
+    if (this._soundBell()) {
+      this._soundService?.playBellSound();
+    }
+
+    this._onBell.fire();
+
+    // if (this._visualBell()) {
+    //   this.element.classList.add('visual-bell-active');
+    //   clearTimeout(this._visualBellTimer);
+    //   this._visualBellTimer = window.setTimeout(() => {
+    //     this.element.classList.remove('visual-bell-active');
+    //   }, 200);
+    // }
+  }
+
+  /**
+   * Resizes the terminal.
+   *
+   * @param x The number of columns to resize to.
+   * @param y The number of rows to resize to.
+   */
+  public resize(x: number, y: number): void {
+    if (x === this.cols && y === this.rows) {
+      // Check if we still need to measure the char size (fixes #785).
+      if (this._charSizeService && !this._charSizeService.hasValidSize) {
+        this._charSizeService.measure();
+      }
+      return;
+    }
+
+    super.resize(x, y);
+  }
+
+  private _afterResize(x: number, y: number): void {
+    this._charSizeService?.measure();
+
+    // Sync the scroll area to make sure scroll events don't fire and scroll the viewport to an
+    // invalid location
+    this.viewport?.syncScrollArea(true);
+  }
+
+  /**
+   * Clear the entire buffer, making the prompt line the new first line.
+   */
+  public clear(): void {
+    if (this.buffer.ybase === 0 && this.buffer.y === 0) {
+      // Don't clear if it's already clear
+      return;
+    }
+    this.buffer.lines.set(0, this.buffer.lines.get(this.buffer.ybase + this.buffer.y)!);
+    this.buffer.lines.length = 1;
+    this.buffer.ydisp = 0;
+    this.buffer.ybase = 0;
+    this.buffer.y = 0;
+    for (let i = 1; i < this.rows; i++) {
+      this.buffer.lines.push(this.buffer.getBlankLine(DEFAULT_ATTR_DATA));
+    }
+    this.refresh(0, this.rows - 1);
+    this._onScroll.fire({ position: this.buffer.ydisp, source: ScrollSource.TERMINAL });
+  }
+
+  /**
+   * Reset terminal.
+   * Note: Calling this directly from JS is synchronous but does not clear
+   * input buffers and does not reset the parser, thus the terminal will
+   * continue to apply pending input data.
+   * If you need in band reset (synchronous with input data) consider
+   * using DECSTR (soft reset, CSI ! p) or RIS instead (hard reset, ESC c).
+   */
+  public reset(): void {
+    /**
+     * Since _setup handles a full terminal creation, we have to carry forward
+     * a few things that should not reset.
+     */
+    this.options.rows = this.rows;
+    this.options.cols = this.cols;
+    const customKeyEventHandler = this._customKeyEventHandler;
+
+    this._setup();
+    super.reset();
+    this._selectionService?.reset();
+
+    // reattach
+    this._customKeyEventHandler = customKeyEventHandler;
+
+    // do a full screen refresh
+    this.refresh(0, this.rows - 1);
+    this.viewport?.syncScrollArea();
+  }
+
+  public clearTextureAtlas(): void {
+    this._renderService?.clearTextureAtlas();
+  }
+
+  private _reportFocus(): void {
+    if (this.element?.classList.contains('focus')) {
+      this.coreService.triggerDataEvent(C0.ESC + '[I');
+    } else {
+      this.coreService.triggerDataEvent(C0.ESC + '[O');
+    }
+  }
+
+  private _reportWindowsOptions(type: WindowsOptionsReportType): void {
+    if (!this._renderService) {
+      return;
+    }
+
+    switch (type) {
+      case WindowsOptionsReportType.GET_WIN_SIZE_PIXELS:
+        const canvasWidth = this._renderService.dimensions.scaledCanvasWidth.toFixed(0);
+        const canvasHeight = this._renderService.dimensions.scaledCanvasHeight.toFixed(0);
+        this.coreService.triggerDataEvent(`${C0.ESC}[4;${canvasHeight};${canvasWidth}t`);
+        break;
+      case WindowsOptionsReportType.GET_CELL_SIZE_PIXELS:
+        const cellWidth = this._renderService.dimensions.scaledCellWidth.toFixed(0);
+        const cellHeight = this._renderService.dimensions.scaledCellHeight.toFixed(0);
+        this.coreService.triggerDataEvent(`${C0.ESC}[6;${cellHeight};${cellWidth}t`);
+        break;
+    }
+  }
+
+  // TODO: Remove cancel function and cancelEvents option
+  public cancel(ev: Event, force?: boolean): boolean | undefined {
+    if (!this.options.cancelEvents && !force) {
+      return;
+    }
+    ev.preventDefault();
+    ev.stopPropagation();
+    return false;
+  }
+
+  private _visualBell(): boolean {
+    return false;
+    // return this.options.bellStyle === 'visual' ||
+    //     this.options.bellStyle === 'both';
+  }
+
+  private _soundBell(): boolean {
+    return this.options.bellStyle === 'sound';
+    // return this.options.bellStyle === 'sound' ||
+    //     this.options.bellStyle === 'both';
+  }
+}
+
+/**
+ * Helpers
+ */
+
+function wasModifierKeyOnlyEvent(ev: KeyboardEvent): boolean {
+  return ev.keyCode === 16 || // Shift
+    ev.keyCode === 17 || // Ctrl
+    ev.keyCode === 18; // Alt
+}