chore(scope): remove watchSet API

Author: mhevery

lib/core/scope.dart

@@ -127,15 +127,6 @@ class Scope {
   Scope(Object this.context, this.rootScope, this._parentScope, this._depth,
         this._index, this.watchGroup, this.observeGroup);
 
-  // TODO(misko): this is a hack and should be removed
-  // A better way to do this is to remove the parser from the scope.
-  Watch watchSet(List<String> exprs, Function reactionFn) {
-    var expr = '{{${exprs.join('}}?{{')}}}';
-    List items = exprs.map(rootScope._parse).toList();
-    AST ast = new PureFunctionAST(expr, new ArrayFn(), items);
-    return watchGroup.watch(ast, reactionFn);
-  }
-
   Watch watch(expression, ReactionFn reactionFn) {
     // Todo(misko): remove the parser from here. It should only take AST.
     assert(expression != null);

lib/directive/ng_pluralize.dart

@@ -92,13 +92,14 @@ class NgPluralizeDirective {
   final dom.Element element;
   final Scope scope;
   final Interpolate interpolate;
+  final AstParser parser;
   int offset;
   Map<String, String> discreteRules = new Map();
   Map<Symbol, String> categoryRules = new Map();
   static final RegExp IS_WHEN = new RegExp(r'^when-(minus-)?.');
 
   NgPluralizeDirective(this.scope, this.element, this.interpolate,
-                       NodeAttrs attributes) {
+                       NodeAttrs attributes, this.parser) {
     Map<String, String> whens = attributes['when'] == null ?
         {} :
         scope.eval(attributes['when']);
@@ -156,6 +157,8 @@ class NgPluralizeDirective {
     var interpolation = interpolate(expression, false, '\${', '}');
     interpolation.setter = (text) => element.text = text;
     interpolation.setter(expression);
-    scope.watchSet(interpolation.expressions, interpolation.call);
+    List items = interpolation.expressions.map((exp) => parser(exp)).toList();
+    AST ast = new PureFunctionAST(expression, new ArrayFn(), items);
+    scope.watch(ast, interpolation.call);
   }
 }