Refactor SourceFile, SourceFileProvider and SourceLocation.

pkg/compiler/lib/src/io/code_output.dart

 // Copyright (c) 2012, 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 dart2js.code_output;
 
 import 'dart:async';
 
 import 'source_information.dart';
 
 class CodeOutputMarker {
   final int offsetDelta;
-  final SourceFileLocation sourcePosition;
+  final SourceLocation sourcePosition;
 
   CodeOutputMarker(this.offsetDelta, this.sourcePosition);
 }
 
 abstract class CodeOutputListener {
   void onText(String text);
   void onDone(int length);
 }
 
 abstract class CodeOutput {
@@ skipping 12 matching lines @@
   int get length;
 
   /// Returns `true` if this output has been closed.
   bool get isClosed;
 
   /// Closes the output. Further writes will cause a [StateError].
   void close();
 
   /// Applies [f] to every marker in this output.
   void forEachSourceLocation(void f(int targetOffset,
-                                    SourceFileLocation sourceLocation));
+                                    SourceLocation sourceLocation));
 }
 
 abstract class AbstractCodeOutput extends CodeOutput {
   List<CodeOutputMarker> markers = new List<CodeOutputMarker>();
   int lastBufferOffset = 0;
   int mappedRangeCounter = 0;
   bool isClosed = false;
 
   void _addInternal(String text);
 
@@ skipping 27 matching lines @@
 
   void beginMappedRange() {
     ++mappedRangeCounter;
   }
 
   void endMappedRange() {
     assert(mappedRangeCounter > 0);
     --mappedRangeCounter;
   }
 
-  void setSourceLocation(SourceFileLocation sourcePosition) {
+  void setSourceLocation(SourceLocation sourcePosition) {
     if (sourcePosition == null) {
       if (markers.length > 0 && markers.last.sourcePosition == null) return;
     }
     int offsetDelta = length - lastBufferOffset;
     markers.add(new CodeOutputMarker(offsetDelta, sourcePosition));
     lastBufferOffset = length;
   }
 
   void forEachSourceLocation(void f(int targetOffset, var sourcePosition)) {
     int targetOffset = 0;
@@ skipping 50 matching lines @@
   }
 
   void close() {
     output.close();
     super.close();
     if (_listeners != null) {
       _listeners.forEach((listener) => listener.onDone(length));
     }
   }
 }