Show import chains for unsupported dart:* library imports.

pkg/compiler/lib/src/diagnostics/messages.dart

 // Copyright (c) 2011, 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.
 
 
 /**
  * The messages in this file should meet the following guide lines:
  *
  * 1. The message should be a complete sentence starting with an uppercase
  * letter, and ending with a period.
@@ skipping 148 matching lines @@
   DART_EXT_NOT_SUPPORTED,
   DEFERRED_COMPILE_TIME_CONSTANT,
   DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION,
   DEFERRED_LIBRARY_DART_2_DART,
   DEFERRED_LIBRARY_DUPLICATE_PREFIX,
   DEFERRED_LIBRARY_WITHOUT_PREFIX,
   DEFERRED_OLD_SYNTAX,
   DEFERRED_TYPE_ANNOTATION,
   DEPRECATED_TYPEDEF_MIXIN_SYNTAX,
   DIRECTLY_THROWING_NSM,
+  DISALLOWED_LIBRARY_IMPORT,
   DUPLICATE_DEFINITION,
   DUPLICATE_EXPORT,
   DUPLICATE_EXPORT_CONT,
   DUPLICATE_EXPORT_DECL,
   DUPLICATE_EXTENDS_IMPLEMENTS,
   DUPLICATE_IMPLEMENTS,
   DUPLICATE_IMPORT,
   DUPLICATE_INITIALIZER,
   DUPLICATE_LABEL,
   DUPLICATE_SUPER_INITIALIZER,
@@ skipping 87 matching lines @@
   INVALID_RECEIVER_IN_INITIALIZER,
   INVALID_SOURCE_FILE_LOCATION,
   INVALID_SYMBOL,
   INVALID_SYNC_MODIFIER,
   INVALID_TYPE_VARIABLE_BOUND,
   INVALID_UNNAMED_CONSTRUCTOR_NAME,
   INVALID_URI,
   INVALID_USE_OF_SUPER,
   LIBRARY_NAME_MISMATCH,
   LIBRARY_NOT_FOUND,
+  LIBRARY_NOT_SUPPORTED,
   LIBRARY_TAG_MUST_BE_FIRST,
   MAIN_NOT_A_FUNCTION,
   MAIN_WITH_EXTRA_PARAMETER,
   MALFORMED_STRING_LITERAL,
   MEMBER_NOT_FOUND,
   MEMBER_NOT_STATIC,
   MEMBER_USES_CLASS_NAME,
   METHOD_NOT_FOUND,
   MINUS_OPERATOR_BAD_ARITY,
   MIRROR_BLOAT,
@@ skipping 1802 matching lines @@
           "'#{importingUri}'."),
 
       MessageKind.INTERNAL_LIBRARY:
         const MessageTemplate(MessageKind.INTERNAL_LIBRARY,
           "Internal library '#{resolvedUri}' is not accessible."),
 
       MessageKind.LIBRARY_NOT_FOUND:
         const MessageTemplate(MessageKind.LIBRARY_NOT_FOUND,
           "Library not found '#{resolvedUri}'."),
 
+      MessageKind.LIBRARY_NOT_SUPPORTED:
+        const MessageTemplate(MessageKind.LIBRARY_NOT_SUPPORTED,
+          "Library not supported '#{resolvedUri}'.",
+          howToFix: "Try removing the dependency or enabling support using "
+                    "the '--categories' option.",
+          examples: const [/*
+              """
+              import 'dart:io';
+              main() {}
+              """
+          */]),
+          // TODO(johnniwinther): Enable example when message_kind_test.dart
+          // supports library loader callbacks.
+
       MessageKind.UNSUPPORTED_EQ_EQ_EQ:
         const MessageTemplate(MessageKind.UNSUPPORTED_EQ_EQ_EQ,
           "'===' is not an operator. "
           "Did you mean '#{lhs} == #{rhs}' or 'identical(#{lhs}, #{rhs})'?"),
 
       MessageKind.UNSUPPORTED_BANG_EQ_EQ:
         const MessageTemplate(MessageKind.UNSUPPORTED_BANG_EQ_EQ,
           "'!==' is not an operator. "
           "Did you mean '#{lhs} != #{rhs}' or '!identical(#{lhs}, #{rhs})'?"),
 
@@ skipping 1159 matching lines @@
 $IMPORT_EXPERIMENTAL_MIRRORS_PADDING#{importChain}
 *
 * You can disable this message by using the --enable-experimental-mirrors
 * command-line flag.
 *
 * To learn what to do next, please visit:
 *    http://dartlang.org/dart2js-reflection
 ****************************************************************
 '''),
 
+      MessageKind.DISALLOWED_LIBRARY_IMPORT:
+        const MessageTemplate(MessageKind.DISALLOWED_LIBRARY_IMPORT, '''
+Your app imports the unsupported library '#{uri}' via:
+''''''
+$DISALLOWED_LIBRARY_IMPORT_PADDING#{importChain}
+
+Use the --categories option to support import of '#{uri}'.
+'''),
 
       MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND:
         const MessageTemplate(
           MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND,
           "dart:mirrors library is not supported when using this backend."),
 
       MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS:
         const MessageTemplate(MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS,
           "Non-supported 'call' member on a native class, or a "
           "subclass of a native class."),
@@ skipping 20 matching lines @@
           "more code and prevents the compiler from doing some optimizations.",
           howToFix: "Consider removing this 'noSuchMethod' implementation."),
 
       MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
         const MessageTemplate(MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
           "Unsupported version of package:lookup_map.",
           howToFix: DONT_KNOW_HOW_TO_FIX),
 
   }; // End of TEMPLATES.
 
+  /// Padding used before and between import chains in the message for
+  /// [MessageKind.IMPORT_EXPERIMENTAL_MIRRORS].
   static const String IMPORT_EXPERIMENTAL_MIRRORS_PADDING = '\n*   ';
 
+  /// Padding used before and between import chains in the message for
+  /// [MessageKind.DISALLOWED_LIBRARY_IMPORT].
+  static const String DISALLOWED_LIBRARY_IMPORT_PADDING = '\n  ';
+
   toString() => template;
 
   Message message([Map arguments = const {}, bool terse = false]) {
     return new Message(this, arguments, terse);
   }
 
   bool get hasHowToFix => howToFix != null && howToFix != DONT_KNOW_HOW_TO_FIX;
 }
 
 class Message {
@@ skipping 44 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }