Add IBuffer, IBufferSet and fix CircularList type

src/Interfaces.ts

@@ -33,9 +33,8 @@ export interface ITerminal {
   cursorState: number;
   defAttr: number;
   scrollback: number;
-  buffers: any;  // This should be a `BufferSet` class, but it would result in circular dependency
-  buffer: any;  // This should be a `Buffer` class, but it would result in circular dependency
-  viewport: any;  // This should be a `Viewport` class, but it would result in circular dependency
+  buffers: IBufferSet;
+  buffer: IBuffer;
 
   /**
    * Emit the 'data' event and populate the given data.
@@ -51,6 +50,24 @@ export interface ITerminal {
   showCursor(): void;
 }
 
+export interface IBuffer {
+  lines: ICircularList<[number, string, number][]>;
+  ydisp: number;
+  ybase: number;
+  y: number;
+  x: number;
+  tabs: any;
+}
+
+export interface IBufferSet {
+  alt: IBuffer;
+  normal: IBuffer;
+  active: IBuffer;
+
+  activateNormalBuffer(): void;
+  activateAltBuffer(): void;
+}
+
 export interface ISelectionManager {
   selectionText: string;
   selectionStart: [number, number];
@@ -72,7 +89,7 @@ export interface ILinkifier {
   deregisterLinkMatcher(matcherId: number): boolean;
 }
 
-interface ICircularList<T> {
+export interface ICircularList<T> extends IEventEmitter {
   length: number;
   maxLength: number;
 
@@ -86,6 +103,11 @@ interface ICircularList<T> {
   shiftElements(start: number, count: number, offset: number): void;
 }
 
+export interface IEventEmitter {
+  on(type, listener): void;
+  off(type, listener): void;
+}
+
 export interface LinkMatcherOptions {
   /**
    * The index of the link from the regex.match(text) call. This defaults to 0