| // Copyright (c) 2013, 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 barback.errors; |
| |
| import 'dart:async'; |
| import 'dart:io'; |
| |
| import 'package:stack_trace/stack_trace.dart'; |
| |
| import 'asset_id.dart'; |
| import 'transformer.dart'; |
| |
| /// Error thrown when an asset with [id] cannot be found. |
| class AssetNotFoundException implements Exception { |
| final AssetId id; |
| |
| AssetNotFoundException(this.id); |
| |
| String toString() => "Could not find asset $id."; |
| } |
| |
| /// The interface for exceptions from the barback graph or its transformers. |
| /// |
| /// These exceptions are never produced by programming errors in barback. |
| abstract class BarbackException implements Exception {} |
| |
| /// Error thrown when two or more transformers both output an asset with [id]. |
| class AssetCollisionException implements BarbackException { |
| /// All the transforms that output an asset with [id]. |
| /// |
| /// If this only contains a single transform, that indicates that a |
| /// transformer produced an output that collides with a source asset or an |
| /// asset from a previous phase. |
| final Set<TransformInfo> transforms; |
| final AssetId id; |
| |
| AssetCollisionException(Iterable<TransformInfo> transforms, this.id) |
| : transforms = new Set.from(transforms); |
| |
| String toString() => "Transforms $transforms all emitted asset $id."; |
| } |
| |
| /// Error thrown when a transformer requests an input [id] which cannot be |
| /// found. |
| class MissingInputException implements BarbackException { |
| /// The transform that requested [id]. |
| final TransformInfo transform; |
| final AssetId id; |
| |
| MissingInputException(this.transform, this.id); |
| |
| String toString() => "Transform $transform tried to load missing input $id."; |
| } |
| |
| /// Error thrown when a transformer outputs an asset to a different package than |
| /// the primary input's. |
| class InvalidOutputException implements BarbackException { |
| /// The transform that output the asset. |
| final TransformInfo transform; |
| final AssetId id; |
| |
| InvalidOutputException(this.transform, this.id); |
| |
| String toString() => "Transform $transform emitted $id, which wasn't in the " |
| "same package (${transform.primaryId.package})."; |
| } |
| |
| /// Error wrapping an exception thrown by a transform. |
| class TransformerException implements BarbackException { |
| /// The transform that threw the exception. |
| final TransformInfo transform; |
| |
| /// The wrapped exception. |
| final error; |
| |
| TransformerException(this.transform, this.error); |
| |
| String toString() => "Transform $transform threw error: $error\n" + |
| new Trace.from(getAttachedStackTrace(error)).terse.toString(); |
| } |
| |
| /// Error thrown when a source asset [id] fails to load. |
| /// |
| /// This can be thrown either because the source asset was expected to exist and |
| /// did not or because reading it failed somehow. |
| class AssetLoadException implements BarbackException { |
| final AssetId id; |
| |
| /// The wrapped exception. |
| final error; |
| |
| AssetLoadException(this.id, this.error); |
| |
| String toString() => "Failed to load source asset $id: $error\n" |
| "${new Trace.from(getAttachedStackTrace(error)).terse}"; |
| } |
| |
| /// Information about a single transform in the barback graph. |
| /// |
| /// Identifies a single transformation in the barback graph. |
| /// |
| /// A transformation is uniquely identified by the ID of its primary input, and |
| /// the transformer that is applied to it. |
| class TransformInfo { |
| /// The transformer that's run for this transform. |
| final Transformer transformer; |
| |
| /// The id of this transform's primary asset. |
| final AssetId primaryId; |
| |
| TransformInfo(this.transformer, this.primaryId); |
| |
| bool operator==(other) => |
| other is TransformInfo && |
| other.transformer == transformer && |
| other.primaryId == primaryId; |
| |
| int get hashCode => transformer.hashCode ^ primaryId.hashCode; |
| |
| String toString() => "$transformer on $primaryId"; |
| } |