feat(parser): add support for formatters

modules/facade/src/collection.dart

@@ -46,6 +46,7 @@ class ListWrapper {
   static last(List list) => list.last;
   static List reversed(List list) => list.reversed.toList();
   static void push(List l, e) { l.add(e); }
+  static List concat(List a, List b) {a.addAll(b); return a;}
 }
 
 class SetWrapper {

modules/facade/src/collection.es6

@@ -79,6 +79,7 @@ export class ListWrapper {
     var a = ListWrapper.clone(array);
     return a.reverse();
   }
+  static concat(a, b) {return a.concat(b);}
 }
 
 export class SetWrapper {

modules/facade/src/lang.dart

@@ -103,3 +103,18 @@ class RegExpMatcherWrapper {
   }
 }
 
+class FunctionWrapper {
+  static apply(Function fn, posArgs) {
+    return Function.apply(fn, posArgs);
+  }
+}
+
+class BaseException extends Error {
+  final String message;
+
+  BaseException(this.message);
+
+  String toString() {
+    return this.message;
+  }
+}

modules/facade/src/lang.es6

@@ -137,3 +137,18 @@ export class RegExpMatcherWrapper {
   }
 }
 
+export class FunctionWrapper {
+  static apply(fn:Function, posArgs) {
+    return fn.apply(null, posArgs);
+  }
+}
+
+export class BaseException extends Error {
+  constructor(message){
+    this.message = message;
+  }
+
+  toString():String {
+    return this.message;
+  }
+}