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pkg/lookup_map/lib/lookup_map.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Defines [LookupMap], a simple map that can be optimized by dart2js.
 library lookup_map;
 
 /// [LookupMap] is a simple, but very restricted map.  The map can only hold
 /// constant keys and the only way to use the map is to retrieve values with a
 /// key you already have.  Except for lookup, any other operation in [Map] (like
@@ skipping 42 matching lines @@
   ///     const map = const LookupMap(const [A, 1],
   ///         const [const LookupMap(const [A, 2, B, 4]),
   ///                const LookupMap(const [A, 3, B, 5]));
   ///
   /// `map[A]` returns `1` and `map[B]` returns `5`.
   ///
   /// Note: in the future we expect to change [entries] to be a const map
   /// instead of a list of key-value pairs.
   // TODO(sigmund): make entries a map once we fix TypeImpl.== (issue #17207).
   const LookupMap(List entries, [List<LookupMap<K, V>> nestedMaps = const []])
-    : _key = null, _value = null, _entries = entries, _nestedMaps = nestedMaps;
+      : _key = null,
+        _value = null,
+        _entries = entries,
+        _nestedMaps = nestedMaps;
 
   /// Creates a lookup map with a single key-value pair.
   const LookupMap.pair(K key, V value)
-    : _key = key, _value = value, _entries = const [], _nestedMaps = const [];
+      : _key = key,
+        _value = value,
+        _entries = const [],
+        _nestedMaps = const [];
 
   /// Return the data corresponding to [key].
-  V operator[](K key) {
+  V operator [](K key) {
     var map = _flatMap[this];
     if (map == null) {
       map = {};
       _addEntriesTo(map);
       _flatMap[this] = map;
     }
     return map[key];
   }
 
   /// Add to [map] entries from [nestedMaps] and from [entries] according to the
@@ skipping 10 matching lines @@
 /// An expando that stores a flatten version of a [LookupMap], this is
 /// computed and stored the first time the map is accessed.
 final _flatMap = new Expando('_flat_map');
 
 /// Internal constant that matches the version in the pubspec. This is used by
 /// dart2js to ensure that optimizations are only enabled on known versions of
 /// this code.
 // Note: this needs to be kept in sync with the pubspec, otherwise
 // test/version_check_test would fail.
 final _version = '0.0.1+1';