Eat some dogfood!

lib/src/source_code.dart

 // Copyright (c) 2014, 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.
 
 library dart_style.src.source_code;
 
 /// Describes a chunk of source code that is to be formatted or has been
 /// formatted.
 class SourceCode {
   /// The [uri] where the source code is from.
@@ skipping 32 matching lines @@
 
   /// Gets the source code following the selection.
   ///
   /// If there is no selection, returns an empty string.
   String get textAfterSelection {
     if (selectionStart == null) return "";
     return text.substring(selectionStart + selectionLength);
   }
 
   SourceCode(this.text,
-      {this.uri, this.isCompilationUnit: true, this.selectionStart,
+      {this.uri,
+      this.isCompilationUnit: true,
+      this.selectionStart,
       this.selectionLength}) {
     // Must either provide both selection bounds or neither.
     if ((selectionStart == null) != (selectionLength == null)) {
       throw new ArgumentError(
           "Is selectionStart is provided, selectionLength must be too.");
     }
 
     if (selectionStart != null) {
       if (selectionStart < 0) {
         throw new ArgumentError("selectionStart must be non-negative.");
       }
 
       if (selectionStart > text.length) {
         throw new ArgumentError("selectionStart must be within text.");
       }
     }
 
     if (selectionLength != null) {
       if (selectionLength < 0) {
         throw new ArgumentError("selectionLength must be non-negative.");
       }
 
       if (selectionStart + selectionLength > text.length) {
         throw new ArgumentError("selectionLength must end within text.");
       }
     }
   }
 }