Refactor analysis server code generation to re-use logic from analyzer.

pkg/analysis_server/tool/spec/codegen_dart_protocol.dart

 // Copyright (c) 2014, 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 codegen.protocol;
 
 import 'dart:convert';
 
+import 'package:analyzer/src/codegen/tools.dart';
 import 'package:html/dom.dart' as dom;
 
 import 'api.dart';
 import 'codegen_dart.dart';
-import 'codegen_tools.dart';
 import 'from_html.dart';
 import 'implied_types.dart';
 import 'to_html.dart';
 
 /**
- * Translate spec_input.html into protocol_matchers.dart.
- */
-main() {
-  target.generate();
-}
-
-/**
  * Special flags that need to be inserted into the declaration of the Element
  * class.
  */
 const Map<String, String> specialElementFlags = const {
   'abstract': '0x01',
   'const': '0x02',
   'final': '0x04',
   'static': '0x08',
   'private': '0x10',
   'deprecated': '0x20'
 };
 
-final GeneratedFile target =
-    new GeneratedFile('../../lib/plugin/protocol/generated_protocol.dart', () {
-  CodegenProtocolVisitor visitor = new CodegenProtocolVisitor(readApi());
+final GeneratedFile target = new GeneratedFile(
+    'lib/plugin/protocol/generated_protocol.dart', (String pkgPath) {
+  CodegenProtocolVisitor visitor = new CodegenProtocolVisitor(readApi(pkgPath));
   return visitor.collectCode(visitor.visitApi);
 });
 
 /**
  * Callback type used to represent arbitrary code generation.
  */
 typedef void CodegenCallback();
 
 typedef String FromJsonSnippetCallback(String jsonPath, String json);
 
@@ skipping 1189 matching lines @@
 
   @override
   String get asClosure => '($type value) => ${callback('value')}';
 
   @override
   bool get isIdentity => false;
 
   @override
   String asSnippet(String value) => callback(value);
 }