Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/filter/limit_to.dart

Index: third_party/pkg/angular/lib/filter/limit_to.dart
diff --git a/third_party/pkg/angular/lib/filter/limit_to.dart b/third_party/pkg/angular/lib/filter/limit_to.dart
new file mode 100644
index 0000000000000000000000000000000000000000..17d6c35ceebeb1d5e47339ec660731eeb8e583ec
--- /dev/null
+++ b/third_party/pkg/angular/lib/filter/limit_to.dart
@@ -0,0 +1,69 @@
+part of angular.filter;
+
+/**
+ * Creates a new List or String containing only a prefix/suffix of the
+ * elements as specified by the `limit` parameter.
+ *
+ * When operating on a List, the returned list is always a copy even when all
+ * the elements are being returned.
+ *
+ * When the `limit` expression evaluates to a positive integer, `limit` items
+ * from the beginning of the List/String are returned.  When `limit` evaluates
+ * to a negative integer, `|limit|` items from the end of the List/String are
+ * returned.  If `|limit|` is larger than the size of the List/String, then the
+ * entire List/String is returned.  In the case of a List, a copy of the list is
+ * returned.
+ *
+ * If the `limit` expression evaluates to a null or non-integer, then an empty
+ * list is returned.  If the input is a null List/String, a null is returned.
+ *
+ * Example:
+ *
+ * - `{{ 'abcdefghij' | limitTo: 4 }}` → `'abcd'`
+ * - `{{ 'abcdefghij' | limitTo: -4 }}` → `'ghij'`
+ * - `{{ 'abcdefghij' | limitTo: -100 }}` → `'abcdefghij'`
+ *
+ * <br>
+ *
+ * This [ng-repeat] directive:
+ *
+ *     <li ng-repeat="i in 'abcdefghij' | limitTo:-2">{{i}}</li>
+ *
+ * results in
+ *
+ *     <li>i</li>
+ *     <li>j</li>
+ */
+@NgFilter(name:'limitTo')
+class LimitToFilter {
+  Injector _injector;
+  Parser _parser;
+
+  LimitToFilter(this._injector, this._parser);
+
+  dynamic call(dynamic items, [int limit]) {
+    if (items == null) {
+      return null;
+    }
+    if (limit == null) {
+      return const[];
+    }
+    if (items is! List && items is! String) {
+      return items;
+    }
+    int i = 0, j = items.length;
+    if (limit > -1) {
+      j = (limit > j) ? j : limit;
+    } else {
+      i = j + limit;
+      if (i < 0) {
+        i = 0;
+      }
+    }
+    if (items is String) {
+      return (items as String).substring(i, j);
+    } else {
+      return (items as List).getRange(i, j).toList(growable: false);
+    }
+  }
+}