Start pulling pub from its own repo.

sdk/lib/_internal/pub/asset/dart/serialize/transform.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 pub.asset.serialize.transform;
-
-import 'dart:async';
-import 'dart:isolate';
-
-import 'package:barback/barback.dart';
-// TODO(nweiz): don't import from "src" once issue 14966 is fixed.
-import 'package:barback/src/internal_asset.dart';
-
-import '../serialize.dart';
-import 'get_input_transform.dart';
-
-/// Serialize the methods shared between [Transform] and [DeclaringTransform].
-///
-/// [additionalFields] contains additional serialized fields to add to the
-/// serialized transform. [methodHandlers] is a set of additional methods. Each
-/// value should take a JSON message and return the response (which may be a
-/// Future).
-Map _serializeBaseTransform(transform, Map additionalFields,
-    Map<String, Function> methodHandlers) {
-  var receivePort = new ReceivePort();
-  receivePort.listen((wrappedMessage) {
-    respond(wrappedMessage, (message) {
-      var handler = methodHandlers[message['type']];
-      if (handler != null) return handler(message);
-
-      if (message['type'] == 'consumePrimary') {
-        transform.consumePrimary();
-        return null;
-      }
-
-      assert(message['type'] == 'log');
-      var method = {
-        'Info': transform.logger.info,
-        'Fine': transform.logger.fine,
-        'Warning': transform.logger.warning,
-        'Error': transform.logger.error
-      }[message['level']];
-      assert(method != null);
-
-      var assetId = message['assetId'] == null ? null :
-        deserializeId(message['assetId']);
-      var span = message['span'] == null ? null :
-        deserializeSpan(message['span']);
-      method(message['message'], asset: assetId, span: span);
-    });
-  });
-
-  return {'port': receivePort.sendPort}..addAll(additionalFields);
-}
-
-/// Converts [transform] into a serializable map.
-Map serializeTransform(Transform transform) {
-  return _serializeBaseTransform(transform, {
-    'primaryInput': serializeAsset(transform.primaryInput)
-  }, {
-    'getInput': (message) => transform.getInput(deserializeId(message['id']))
-        .then((asset) => serializeAsset(asset)),
-    'addOutput': (message) =>
-        transform.addOutput(deserializeAsset(message['output']))
-  });
-}
-
-/// Converts [transform] into a serializable map.
-Map serializeDeclaringTransform(DeclaringTransform transform) {
-  return _serializeBaseTransform(transform, {
-    'primaryId': serializeId(transform.primaryId)
-  }, {
-    'declareOutput': (message) =>
-        transform.declareOutput(deserializeId(message['output']))
-  });
-}
-
-/// The base class for wrappers for [Transform]s that are in the host isolate.
-class _ForeignBaseTransform {
-  /// The port with which we communicate with the host isolate.
-  ///
-  /// This port and all messages sent across it are specific to this transform.
-  final SendPort _port;
-
-  TransformLogger get logger => _logger;
-  TransformLogger _logger;
-
-  _ForeignBaseTransform(Map transform)
-      : _port = transform['port'] {
-    _logger = new TransformLogger((assetId, level, message, span) {
-      call(_port, {
-        'type': 'log',
-        'level': level.name,
-        'message': message,
-        'assetId': assetId == null ? null : serializeId(assetId),
-        'span': span == null ? null : serializeSpan(span)
-      });
-    });
-  }
-
-  void consumePrimary() {
-    call(_port, {'type': 'consumePrimary'});
-  }
-}
-
-/// A wrapper for a [Transform] that's in the host isolate.
-///
-/// This retrieves inputs from and sends outputs and logs to the host isolate.
-class ForeignTransform extends _ForeignBaseTransform
-    with GetInputTransform implements Transform {
-  final Asset primaryInput;
-
-  /// Creates a transform from a serialized map sent from the host isolate.
-  ForeignTransform(Map transform)
-      : primaryInput = deserializeAsset(transform['primaryInput']),
-        super(transform);
-
-  Future<Asset> getInput(AssetId id) {
-    return call(_port, {
-      'type': 'getInput',
-      'id': serializeId(id)
-    }).then(deserializeAsset);
-  }
-
-  void addOutput(Asset output) {
-    call(_port, {
-      'type': 'addOutput',
-      'output': serializeAsset(output)
-    });
-  }
-}
-
-/// A wrapper for a [DeclaringTransform] that's in the host isolate.
-class ForeignDeclaringTransform extends _ForeignBaseTransform
-    implements DeclaringTransform {
-  final AssetId primaryId;
-
-  /// Creates a transform from a serializable map sent from the host isolate.
-  ForeignDeclaringTransform(Map transform)
-      : primaryId = deserializeId(transform['primaryId']),
-        super(transform);
-
-  void declareOutput(AssetId id) {
-    call(_port, {
-      'type': 'declareOutput',
-      'output': serializeId(id)
-    });
-  }
-}