Create InputHandler which performs C0 actions

Part of xtermjs#459

src/InputHandler.ts

@@ -0,0 +1,50 @@
+import { IInputHandler, ITerminal } from './Interfaces';
+
+export class InputHandler implements IInputHandler {
+ // TODO: We want to type _terminal when it's pulled into TS
+ constructor(private _terminal: any) { }
+
+ public bell(): void {
+ if (!this._terminal.visualBell) {
+ return;
+ }
+ this._terminal.element.style.borderColor = 'white';
+ setTimeout(() => this._terminal.element.style.borderColor = '', 10);
+ if (this._terminal.popOnBell) {
+ this._terminal.focus();
+ }
+ }
+
+ public lineFeed(): void {
+ if (this._terminal.convertEol) {
+ this._terminal.x = 0;
+ }
+ this._terminal.y++;
+ if (this._terminal.y > this._terminal.scrollBottom) {
+ this._terminal.y--;
+ this._terminal.scroll();
+ }
+ }
+
+ public carriageReturn(): void {
+ this._terminal.x = 0;
+ }
+
+ public backspace(): void {
+ if (this._terminal.x > 0) {
+ this._terminal.x--;
+ }
+ }
+
+ public tab(): void {
+ this._terminal.x = this._terminal.nextStop();
+ }
+
+ public shiftOut(): void {
+ this._terminal.setgLevel(1);
+ }
+
+ public shiftIn(): void {
+ this._terminal.setgLevel(0);
+ }
+}

src/Interfaces.ts

@@ -32,3 +32,16 @@ export interface ITerminal {
  scrollDisp(disp: number, suppressScrollEvent: boolean);
  cancel(ev: Event, force?: boolean);
 }
+
+/**
+ * Handles actions generated by the parser.
+ */
+export interface IInputHandler {
+ bell(): void;
+ lineFeed(): void;
+ carriageReturn(): void;
+ backspace(): void;
+ tab(): void;
+ shiftOut(): void;
+ shiftIn(): void;
+}

src/xterm.js

@@ -16,6 +16,7 @@ import { Viewport } from './Viewport.js';
 import { rightClickHandler, pasteHandler, copyHandler } from './handlers/Clipboard.js';
 import { CircularList } from './utils/CircularList.js';
 import { C0 } from './EscapeSequences';
+import { InputHandler } from './InputHandler';
 import * as Browser from './utils/Browser';
 import * as Keyboard from './utils/Keyboard';
 
@@ -203,6 +204,8 @@ function Terminal(options) {
  this.prefix = '';
  this.postfix = '';
 
+ this.inputHandler = new InputHandler(this);
+
  // leftover surrogate high from previous write invocation
  this.surrogate_high = '';
 
@@ -1378,47 +1381,38 @@ Terminal.prototype.write = function(data) {
  case normal:
  switch (ch) {
  case C0.BEL:
- this.bell();
+ this.inputHandler.bell();
  break;
 
  case C0.LF:
  case C0.VT:
  case C0.FF:
- if (this.convertEol) {
- this.x = 0;
- }
- this.y++;
- if (this.y > this.scrollBottom) {
- this.y--;
- this.scroll();
- }
+ this.inputHandler.lineFeed();
  break;
 
  // '\r'
  case C0.CR:
- this.x = 0;
+ this.inputHandler.carriageReturn();
  break;
 
  // '\b'
  case C0.BS:
- if (this.x > 0) {
- this.x--;
- }
+ this.inputHandler.backspace();
  break;
 
  // '\t'
  case C0.HT:
- this.x = this.nextStop();
+ this.inputHandler.tab();
  break;
 
  // shift out
  case C0.SO:
- this.setgLevel(1);
+ this.inputHandler.shiftOut();
  break;
 
  // shift in
  case C0.SI:
- this.setgLevel(0);
+ this.inputHandler.shiftIn();
  break;
 
  // '\e'