work in progress: observable implementation using detailed change records

lib/src/directive_parser.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.
 
 /**
  * A mini parser that extracts top-level directives (library, imports, exports,
  * and parts) from a dart source file.
  */
 library directive_parser;
 
 import 'info.dart' show DartCodeInfo, DartDirectiveInfo;
 import 'messages.dart' show Messages;
 import 'file_system/path.dart';
 
 /**
  * Parse and extract top-level directives from [code].
  *
  * Adds emitted error/warning messages to [messages], if [messages] is
  * supplied.
  */
 DartCodeInfo parseDartCode(String code, Path file, {Messages messages}) {
   messages = messages == null ? new Messages.silent() : messages;
   return new _DirectiveParser(messages, file).parse(code);
 }
 
 /** A parser that extracts top-level directives. */
-// TODO(sigmund): add source-span to error messages
+// TODO(sigmund): add source-span to error messages.
+// TODO(jmesserly): replace this with something based on compiler_unsupported.
 class _DirectiveParser {
   /** Path to the source file containing the code (for error messages). */
   Path file;
 
   /** Tokenizer used to parse the input until the end of the directives. */
   _DirectiveTokenizer tokenizer;
 
   /** Extracted library identifier, if any. */
   String libraryName;
 
@@ skipping 341 matching lines @@
   static const int _ZERO = 48;         // 0
   static const int _NINE = 57;         // 9
   static const int _SEMICOLON = 59;    // ;
   static const int _UPPER_A = 65;      // A
   static const int _UPPER_Z = 90;      // Z
   static const int _BACKSLASH = 92;    // \
   static const int _UNDERSCORE = 95;   // _
   static const int _LOWER_A = 97;      // a
   static const int _LOWER_Z = 122;     // z
 }