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// 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.
library dart2js.diagnostics.spannable;
* Tagging interface for classes from which source spans can be generated.
// TODO(johnniwinther): Find a better name.
// TODO(ahe): How about "Bolt"?
abstract class Spannable {}
class _SpannableSentinel implements Spannable {
final String name;
const _SpannableSentinel(;
String toString() => name;
/// Sentinel spannable used to mark that diagnostics should point to the
/// current element. Note that the diagnostic reporting will fail if the current
/// element is `null`.
const _SpannableSentinel("Current element");
/// Sentinel spannable used to mark that there might be no location for the
/// diagnostic. Use this only when it is not an error not to have a current
/// element.
const Spannable NO_LOCATION_SPANNABLE = const _SpannableSentinel("No location");
class SpannableAssertionFailure {
final Spannable node;
final String message;
SpannableAssertionFailure(this.node, this.message);
String toString() => 'Assertion failure'
'${message != null ? ': $message' : ''}';