Start pulling CSI handlers out

Author: Tyriar

src/Parser.ts

@@ -12,6 +12,12 @@ normalStateHandler[C0.BS] = (handler) => handler.backspace();
 normalStateHandler[C0.HT] = (handler) => handler.tab();
 normalStateHandler[C0.SO] = (handler) => handler.shiftOut();
 normalStateHandler[C0.SI] = (handler) => handler.shiftIn();
+// TODO: Add ESC and Default cases to normalStateHandler
+
+const csiStateHandler: {[key: string]: (handler: IInputHandler, parser: Parser) => void} = {};
+csiStateHandler['?'] = (_, parser) => parser.setPrefix('?');
+csiStateHandler['>'] = (_, parser) => parser.setPrefix('>');
+csiStateHandler['!'] = (_, parser) => parser.setPrefix('!');
 
 enum ParserState {
   NORMAL = 0,
@@ -487,6 +493,12 @@ export class Parser {
           break;
 
         case ParserState.CSI:
+          if (ch in normalStateHandler) {
+            normalStateHandler[ch](this._inputHandler);
+            // Skip below switch as this has handled these codes (eventually everything will be handled here
+            break;
+          }
+
           // '?', '>', '!'
           if (ch === '?' || ch === '>' || ch === '!') {
             this._terminal.prefix = ch;
@@ -1036,6 +1048,10 @@ export class Parser {
       }
     }
   }
+
+  public setPrefix(prefix: string) {
+    this._terminal.prefix = prefix;
+  }
 }
 
 const wcwidth = (function(opts) {