Base JavaScript code position computation on JavaScript tracer.

pkg/compiler/lib/src/js/js.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.
 
 library js;
 
 import 'package:js_ast/js_ast.dart';
 export 'package:js_ast/js_ast.dart';
 
 import '../common.dart';
 import '../compiler.dart' show
     Compiler;
 import '../dump_info.dart' show
     DumpInfoTask;
 import '../io/code_output.dart' show
     CodeBuffer,
     CodeOutput;
 import '../js_emitter/js_emitter.dart' show
     USE_LAZY_EMITTER;
 
 import 'js_source_mapping.dart';
 
-CodeBuffer prettyPrint(Node node,
-                       Compiler compiler,
-                       {DumpInfoTask monitor,
-                        bool allowVariableMinification: true,
-                        Renamer renamerForNames:
-                            JavaScriptPrintingOptions.identityRenamer}) {
+String prettyPrint(
+    Node node,
+    Compiler compiler,
+    {bool allowVariableMinification: true,
+     Renamer renamerForNames: JavaScriptPrintingOptions.identityRenamer}) {
+  // TODO(johnniwinther): Do we need all the options here?
+  JavaScriptPrintingOptions options = new JavaScriptPrintingOptions(
+      shouldCompressOutput: compiler.enableMinification,
+      minifyLocalVariables: allowVariableMinification,
+      preferSemicolonToNewlineInMinifiedOutput: USE_LAZY_EMITTER,
+      renamerForNames: renamerForNames);
+  SimpleJavaScriptPrintingContext context =
+      new SimpleJavaScriptPrintingContext();
+  Printer printer = new Printer(options, context);
+  printer.visit(node);
+  return context.getText();
+}
+
+CodeBuffer createCodeBuffer(
+    Node node,
+    Compiler compiler,
+    {DumpInfoTask monitor,
+     bool allowVariableMinification: true,
+     Renamer renamerForNames: JavaScriptPrintingOptions.identityRenamer}) {
   JavaScriptSourceInformationStrategy sourceInformationFactory =
       compiler.backend.sourceInformationStrategy;
   JavaScriptPrintingOptions options = new JavaScriptPrintingOptions(
       shouldCompressOutput: compiler.enableMinification,
       minifyLocalVariables: allowVariableMinification,
       preferSemicolonToNewlineInMinifiedOutput: USE_LAZY_EMITTER,
       renamerForNames: renamerForNames);
   CodeBuffer outBuffer = new CodeBuffer();
   SourceInformationProcessor sourceInformationProcessor =
-      sourceInformationFactory.createProcessor(
-          new SourceLocationsMapper(outBuffer));
+        sourceInformationFactory.createProcessor(
+            new SourceLocationsMapper(outBuffer));
   Dart2JSJavaScriptPrintingContext context =
       new Dart2JSJavaScriptPrintingContext(
           compiler.reporter, monitor, outBuffer, sourceInformationProcessor);
   Printer printer = new Printer(options, context);
   printer.visit(node);
-  sourceInformationProcessor.process(node);
+  sourceInformationProcessor.process(node, outBuffer);
   return outBuffer;
 }
 
 class Dart2JSJavaScriptPrintingContext implements JavaScriptPrintingContext {
   final DiagnosticReporter reporter;
   final DumpInfoTask monitor;
   final CodeBuffer outBuffer;
   final CodePositionListener codePositionListener;
 
   Dart2JSJavaScriptPrintingContext(
@@ skipping 80 matching lines @@
 
   /// A [js.Literal] that represents the string result of unparsing [ast].
   ///
   /// When its string [value] is requested, the node pretty-prints the given
   /// [ast] and, if [protectForEval] is true, wraps the resulting string in
   /// parenthesis. The result is also escaped.
   UnparsedNode(this.tree, this._compiler, this._protectForEval);
 
   LiteralString get _literal {
     if (_cachedLiteral == null) {
-      String text = prettyPrint(tree, _compiler).getText();
+      String text = prettyPrint(tree, _compiler);
       if (_protectForEval) {
         if (tree is Fun) text = '($text)';
         if (tree is LiteralExpression) {
           LiteralExpression literalExpression = tree;
           String template = literalExpression.template;
           if (template.startsWith("function ") ||
           template.startsWith("{")) {
             text = '($text)';
           }
         }
@@ skipping 22 matching lines @@
   }
   if (node is PropertyAccess) {
     PropertyAccess access = node;
     if (access.receiver is InterpolatedExpression) {
       InterpolatedExpression hole = access.receiver;
       return hole.isPositional && hole.nameOrPosition == 0;
     }
   }
   return false;
 }