Options parsing cleanup.

pkg/analyzer-experimental/lib/options.dart

Index: pkg/analyzer-experimental/lib/options.dart
===================================================================
--- pkg/analyzer-experimental/lib/options.dart	(revision 17426)
+++ pkg/analyzer-experimental/lib/options.dart	(working copy)
@@ -114,7 +114,6 @@
     : _knownFlags = <String>[],
       _parser = new ArgParser();
 
-
   /**
    * Defines a flag.
    *
@@ -140,7 +139,6 @@
         allowMultiple: allowMultiple);
   }
 
-
   /**
    * Generates a string displaying usage information for the defined options.
    *
@@ -164,32 +162,10 @@
     }
 
     // Filter all unrecognized flags and options.
-    var filtered = <String>[];
-    for (var i=0; i < args.length; ++i) {
-      var arg = args[i];
-      if (arg.startsWith('--') && arg.length > 2) {
-        if (!_knownFlags.contains(arg.substring(2))) {
-          //"eat" params by advancing to the next flag/option
-          i = _getNextFlagIndex(args, i);
-        } else {
-          filtered.add(arg);
-        }
-      } else {
-        filtered.add(arg);
-      }
-    }
+    return args.where((arg) => !arg.startsWith('--') ||
+        _knownFlags.contains(arg.substring(2)));
 
-    return filtered;
   }
 
-  _getNextFlagIndex(args, i) {
-    for ( ; i < args.length; ++i) {
-      if (args[i].startsWith('--')) {
-        return i;
-      }
-    }
-    return i;
-  }
-
 }