Refactor handling of source map information.

pkg/compiler/lib/src/js/printer.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.
 
 part of js;
 
 class Printer extends Indentation implements NodeVisitor {
   final bool shouldCompressOutput;
   leg.DiagnosticListener diagnosticListener;
   CodeBuffer outBuffer;
@@ skipping 94 matching lines @@
 
   void outIndent(String str) { indent(); out(str); }
   void outIndentLn(String str) { indent(); outLn(str); }
   void indent() {
     if (!shouldCompressOutput) {
       out(indentation);
     }
   }
 
   void beginSourceRange(Node node) {
-    if (node.sourcePosition != null) {
-      outBuffer.beginMappedRange();
-      outBuffer.setSourceLocation(node.sourcePosition);
+    if (node.sourceInformation != null) {
+      node.sourceInformation.beginMapping(outBuffer);
     }
   }
 
   void endSourceRange(Node node) {
-    if (node.endSourcePosition != null) {
-      outBuffer.setSourceLocation(node.endSourcePosition);
-    }
-    if (node.sourcePosition != null) {
-      outBuffer.endMappedRange();
+    if (node.sourceInformation != null) {
+      node.sourceInformation.endMapping(outBuffer);
     }
   }
 
   visit(Node node) {
     beginSourceRange(node);
     if (monitor != null) monitor.enteringAst(node, outBuffer.length);
 
     node.accept(this);
 
     if (monitor != null) monitor.exitingAst(node, outBuffer.length);
@@ skipping 1052 matching lines @@
         codes.add(nthLetter((n ~/ nameSpaceSize) % LETTERS));
       }
       codes.add(charCodes.$0 + digit);
       newName = new String.fromCharCodes(codes);
     }
     assert(new RegExp(r'[a-zA-Z][a-zA-Z0-9]*').hasMatch(newName));
     maps.last[oldName] = newName;
     return newName;
   }
 }