hooks for custom control sequences

This fixes (at least partially) issue #1176
"Add a way to plugin a custom control sequence handler".

src/EscapeSequenceParser.ts

@@ -301,9 +301,39 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
     this._executeHandlerFb = callback;
   }
 
-  setCsiHandler(flag: string, callback: (params: number[], collect: string) => void): void {
+  private _removeHandler(array: any[], callback: any): void {
-    this._csiHandlers[flag.charCodeAt(0)] = callback;
+    if (array) {
+      for (let i = array.length; --i >= 0; ) {
+        if (array[i] == callback) {
+          array.splice(i, 1);
+            return;
+        }
+      }
+    }
   }
+
+  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void {
+    let index = flag.charCodeAt(0);
+    let array = this._csiHandlers[index];
+    if (! array) { this._csiHandlers[index] = array = new Array(); }
+    array.push(callback);
+  }
+
+  removeCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void {
+    let index = flag.charCodeAt(0);
+    let array = this._csiHandlers[index];
+    this._removeHandler(array, callback);
+    if (array && array.length == 0)
+      delete this._csiHandlers[index];
+  }
+  /* deprecated */
+  setCsiHandler(flag: string, callback: (params: number[], collect: string) => void): void {
+    this.clearCsiHandler(flag);
+    this.addCsiHandler(flag, (params: number[], collect: string): boolean => {
+        callback(params, collect); return true;
+    });
+  }
+  /* deprecated */
   clearCsiHandler(flag: string): void {
     if (this._csiHandlers[flag.charCodeAt(0)]) delete this._csiHandlers[flag.charCodeAt(0)];
   }
@@ -321,9 +351,25 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
     this._escHandlerFb = callback;
   }
 
-  setOscHandler(ident: number, callback: (data: string) => void): void {
+  addOscHandler(ident: number, callback: (data: string) => boolean): void {
-    this._oscHandlers[ident] = callback;
+    let array = this._oscHandlers[ident];
+    if (! array) { this._oscHandlers[ident] = array = new Array(); }
+    array.push(callback);
   }
+  removeOscHandler(ident: number, callback: (data: string) => boolean): void {
+    let array = this._oscHandlers[ident];
+    this._removeHandler(array, callback);
+    if (array && array.length == 0)
+      delete this._oscHandlers[ident];
+  }
+  /* deprecated */
+  setOscHandler(ident: number, callback: (data: string) => void): void {
+    this.clearOscHandler(ident);
+    this.addOscHandler(ident, (data: string): boolean => {
+      callback(data); return true;
+    });
+  }
+  /* deprecated */
   clearOscHandler(ident: number): void {
     if (this._oscHandlers[ident]) delete this._oscHandlers[ident];
   }
@@ -463,9 +509,15 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
           }
           break;
         case ParserAction.CSI_DISPATCH:
-          callback = this._csiHandlers[code];
+          let cHandler = this._csiHandlers[code];
-          if (callback) callback(params, collect);
+          if (cHandler) {
-          else this._csiHandlerFb(collect, params, code);
+            for (let i = cHandler.length; ;) {
+              if (--i < 0) { cHandler = null; break; }
+              if ((cHandler[i])(params, collect))
+                break;
+            }
+          }
+          if (! cHandler) this._csiHandlerFb(collect, params, code);
           break;
         case ParserAction.PARAM:
           if (code === 0x3b) params.push(0);
@@ -532,9 +584,15 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
               // or with an explicit NaN OSC handler
               const identifier = parseInt(osc.substring(0, idx));
               const content = osc.substring(idx + 1);
-              callback = this._oscHandlers[identifier];
+              let oHandler = this._oscHandlers[identifier];
-              if (callback) callback(content);
+              if (oHandler) {
-              else this._oscHandlerFb(identifier, content);
+                for (let i = oHandler.length; ;) {
+                  if (--i < 0) { oHandler = null; break; }
+                  if ((oHandler[i])(content))
+                    break;
+                }
+              }
+              if (! oHandler) this._oscHandlerFb(identifier, content);
             }
           }
           if (code === 0x1b) transition |= ParserState.ESCAPE;

src/InputHandler.ts

@@ -4,7 +4,7 @@
  * @license MIT
  */
 
-import { IInputHandler, IDcsHandler, IEscapeSequenceParser, IBuffer, IInputHandlingTerminal } from './Types';
+import { IVtInputHandler, IDcsHandler, IEscapeSequenceParser, IBuffer, IInputHandlingTerminal } from './Types';
 import { C0, C1 } from './common/data/EscapeSequences';
 import { CHARSETS, DEFAULT_CHARSET } from './core/data/Charsets';
 import { CHAR_DATA_CHAR_INDEX, CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CODE_INDEX, DEFAULT_ATTR, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE } from './Buffer';
@@ -112,7 +112,7 @@ class DECRQSS implements IDcsHandler {
  * Refer to http://invisible-island.net/xterm/ctlseqs/ctlseqs.html to understand
  * each function's header comment.
  */
-export class InputHandler extends Disposable implements IInputHandler {
+export class InputHandler extends Disposable implements IVtInputHandler {
   private _surrogateFirst: string;
 
   constructor(
@@ -465,6 +465,19 @@ export class InputHandler extends Disposable implements IInputHandler {
     this._terminal.updateRange(buffer.y);
   }
 
+  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void {
+    this._parser.addCsiHandler(flag, callback);
+  }
+  removeCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void {
+    this._parser.removeCsiHandler(flag, callback);
+  }
+  addOscHandler(ident: number, callback: (data: string) => boolean): void {
+    this._parser.setOscHandler(ident, callback);
+  }
+  removeOscHandler(ident: number, callback: (data: string) => boolean): void {
+    this._parser.removeOscHandler(ident, callback);
+  }
+
   /**
    * BEL
    * Bell (Ctrl-G).

src/Terminal.ts

@@ -21,7 +21,7 @@
  *   http://linux.die.net/man/7/urxvt
  */
 
-import { IInputHandlingTerminal, IViewport, ICompositionHelper, ITerminalOptions, ITerminal, IBrowser, ILinkifier, ILinkMatcherOptions, CustomKeyEventHandler, LinkMatcherHandler, CharData, CharacterJoinerHandler, IBufferLine } from './Types';
+import { IInputHandlingTerminal, IInputHandler, IViewport, ICompositionHelper, ITerminalOptions, ITerminal, IBrowser, ILinkifier, ILinkMatcherOptions, CustomKeyEventHandler, LinkMatcherHandler, CharData, CharacterJoinerHandler, IBufferLine } from './Types';
 import { IMouseZoneManager } from './ui/Types';
 import { IRenderer } from './renderer/Types';
 import { BufferSet } from './BufferSet';
@@ -1286,6 +1286,10 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
     this.refresh(0, this.rows - 1);
   }
 
+  public get inputHandler(): IInputHandler {
+    return this._inputHandler;
+  }
+
   /**
    * Scroll the display of the terminal by a number of pages.
    * @param pageCount The number of pages to scroll (negative scrolls up).

src/Types.ts

@@ -182,6 +182,16 @@ export interface IInputHandler {
       ESC ~ */ setgLevel(level: number): void;
 }
 
+/*
+ * An InputHandler for VT-style terminals
+ */
+export interface IVtInputHandler extends IInputHandler {
+  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void;
+  removeCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void;
+  addOscHandler(ident: number, callback: (data: string) => boolean): void;
+  removeOscHandler(ident: number, callback: (data: string) => boolean): void;
+}
+
 export interface ILinkMatcher {
   id: number;
   regex: RegExp;
@@ -492,6 +502,10 @@ export interface IEscapeSequenceParser extends IDisposable {
   setCsiHandler(flag: string, callback: (params: number[], collect: string) => void): void;
   clearCsiHandler(flag: string): void;
   setCsiHandlerFallback(callback: (collect: string, params: number[], flag: number) => void): void;
+  addCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void;
+  removeCsiHandler(flag: string, callback: (params: number[], collect: string) => boolean): void;
+  addOscHandler(ident: number, callback: (data: string) => boolean): void;
+  removeOscHandler(ident: number, callback: (data: string) => boolean): void;
 
   setEscHandler(collectAndFlag: string, callback: () => void): void;
   clearEscHandler(collectAndFlag: string): void;

src/public/Terminal.ts

@@ -4,7 +4,7 @@
  */
 
 import { Terminal as ITerminalApi, ITerminalOptions, IMarker, IDisposable, ILinkMatcherOptions, ITheme, ILocalizableStrings } from 'xterm';
-import { ITerminal } from '../Types';
+import { ITerminal, IInputHandler } from '../Types';
 import { Terminal as TerminalCore } from '../Terminal';
 import * as Strings from '../Strings';
 
@@ -15,6 +15,9 @@ export class Terminal implements ITerminalApi {
     this._core = new TerminalCore(options);
   }
 
+  public get inputHandler(): IInputHandler {
+    return (this._core as TerminalCore).inputHandler;
+  }
   public get element(): HTMLElement { return this._core.element; }
   public get textarea(): HTMLTextAreaElement { return this._core.textarea; }
   public get rows(): number { return this._core.rows; }