Update all Angular libs (run update_all.sh).

third_party/pkg/angular/lib/tools/expression_extractor.dart

 library angular.tools.html_expression_extractor;
 
 import 'dart:async';
 import 'dart:io';
 import 'package:angular/tools/html_extractor.dart';
 import 'package:angular/tools/source_metadata_extractor.dart';
 import 'package:angular/tools/source_crawler_impl.dart';
 import 'package:angular/tools/io.dart';
 import 'package:angular/tools/io_impl.dart';
 import 'package:angular/tools/common.dart';
 
 import 'package:di/di.dart';
 import 'package:di/dynamic_injector.dart';
 
-import 'package:angular/core/module.dart';
 import 'package:angular/core/parser/parser.dart';
 import 'package:angular/tools/parser_getter_setter/generator.dart';
-import 'package:angular/tools/parser_generator/generator.dart';
 
 main(args) {
   if (args.length < 5) {
     print('Usage: expression_extractor file_to_scan html_root header_file '
           'footer_file output [package_roots+]');
     exit(0);
   }
   IoService ioService = new IoServiceImpl();
 
   var packageRoots =
       (args.length < 6) ? [Platform.packageRoot] : args.sublist(5);
   var sourceCrawler = new SourceCrawlerImpl(packageRoots);
   var sourceMetadataExtractor = new SourceMetadataExtractor();
   List<DirectiveInfo> directives =
       sourceMetadataExtractor.gatherDirectiveInfo(args[0], sourceCrawler);
   var htmlExtractor = new HtmlExpressionExtractor(directives);
   htmlExtractor.crawl(args[1], ioService);
 
   var expressions = htmlExtractor.expressions;
   expressions.add('null');
 
   var headerFile = args[2];
   var footerFile = args[3];
   var outputFile = args[4];
-  SourcePrinter printer;
+  var printer;
   if (outputFile == '--') {
-    printer = new SourcePrinter();
+    printer = stdout;
   } else {
-    printer = new FileSourcePrinter(outputFile);
+    printer = new File(outputFile).openWrite();
   }
 
   // Output the header file first.
   if (headerFile != '') {
-    printer.printSrc(_readFile(headerFile));
+    printer.write(_readFile(headerFile));
   }
 
-  printer.printSrc('// Found ${expressions.length} expressions');
+  printer.write('// Found ${expressions.length} expressions\n');
   Module module = new Module()
       ..type(Parser, implementedBy: DynamicParser)
-      ..type(ParserBackend, implementedBy: DartGetterSetterGen)
-      ..type(FilterMap, implementedBy: NullFilterMap)
-      ..value(SourcePrinter, printer);
+      ..type(ParserBackend, implementedBy: DartGetterSetterGen);
   Injector injector =
       new DynamicInjector(modules: [module], allowImplicitInjection: true);
 
   runZoned(() {
     // Run the generator.
-    injector.get(ParserGetterSetter).generateParser(htmlExtractor.expressions);
+    injector.get(ParserGetterSetter).generateParser(htmlExtractor.expressions,
+        printer);
   }, zoneSpecification: new ZoneSpecification(print: (_, __, ___, String line) {
-    printer.printSrc(line);
+    printer.write(line);
   }));
 
 
   // Output footer last.
   if (footerFile != '') {
-    printer.printSrc(_readFile(footerFile));
+    printer.write(_readFile(footerFile));
   }
 }
 
 String _readFile(String filePath) => new File(filePath).readAsStringSync();
-
-class FileSourcePrinter implements SourcePrinter {
-  final File _file;
-
-  FileSourcePrinter(String filePath)
-      : _file = new File(filePath) {
-    // clear file
-    _file.writeAsStringSync('');
-  }
-
-  printSrc(src) => _file.writeAsStringSync('$src\n', mode: FileMode.APPEND);
-}