Generate dart2js and analyzer files for shared messages.

pkg/dart_messages/lib/shared_messages.dart

Index: pkg/dart_messages/lib/shared_messages.dart
diff --git a/pkg/dart_messages/lib/shared_messages.dart b/pkg/dart_messages/lib/shared_messages.dart
index bd51f581934a31c2f75267c359de6f5ba33f490e..3c66dd1b51250584c42d3cda357447d7804f4c0e 100644
--- a/pkg/dart_messages/lib/shared_messages.dart
+++ b/pkg/dart_messages/lib/shared_messages.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // An update to this file must be followed by regenerating the corresponding
-// json file. Use `json_converter.dart` in the bin directory.
+// json, dart2js and analyzer file. Use `publish.dart` in the bin directory.
 //
 // Every message in this file must have an id. Use `message_id.dart` in the
 // bin directory to generate a fresh one.
@@ -58,5 +58,56 @@
 // 1. what is wrong, 2. why is it wrong, 3. how do I fix it. However, we
 // combine the first two in [template] and the last in [howToFix].
 
-final Map<String, Map> MESSAGES = {
+import 'dart:convert';
+
+class Message {
+  final String id;
+  final String template;
+  // The analyzer fills holes positionally (and not named). The following field
+  // overrides the order of the holes.
+  // For example the template "The argument #field in #cls is bad", could have
+  // the order `["cls", "field"]', which means that the analyzer would first
+  // provide the class `cls` and then only `field`.
+  // This list is generally `null`, but when it is provided it must contain all
+  // holes.
+  final List templateHoleOrder;
+  final String howToFix;
+  final List<String> options;
+  final List examples;
+
+  Message({this.id, this.template, this.templateHoleOrder, this.howToFix,
+      this.options, this.examples});
+}
+
+String get messagesAsJson {
+  var jsonified = {};
+  MESSAGES.forEach((String name, Message message) {
+    jsonified[name] =  {
+      'id': message.id,
+      'template': message.template,
+      'howToFix': message.howToFix
+    };
+  });
+  return JSON.encode(jsonified);
+}
+
+final Map<String, Message> MESSAGES = {
+  'exampleMessage': new Message(
+      id: 'use an Id generated by bin/message_id.dart',
+      template: "#use #named #arguments",
+      templateHoleOrder: ["arguments", "named", "use"],
+      howToFix: "an explanation on how to fix things",
+      examples: [r'''
+Some multiline example;

[Siggi Cherem (dart-lang), 2016/01/14 17:57:40]

consider indenting this if the extra space is not relevant (e.g. if this only
used for testing like we do in dart2js, or if we can format the output anyways
afterwards).

[floitsch, 2016/01/15 17:20:39]

Done.

+That generates the bug.''',
+      {
+'fileA.dart': '''
+or a map from file to content.
+again multiline''',
+'fileB.dart': '''
+with possibly multiple files.
+muliline too'''
+      }
+    ]
+  ),
 };