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stack_trace/lib/src/stack_zone_specification.dart

Index: stack_trace/lib/src/stack_zone_specification.dart
diff --git a/stack_trace/lib/src/stack_zone_specification.dart b/stack_trace/lib/src/stack_zone_specification.dart
deleted file mode 100644
index 25d96427110f76a22b134fbaa2634025225434cd..0000000000000000000000000000000000000000
--- a/stack_trace/lib/src/stack_zone_specification.dart
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@@ -1,236 +0,0 @@
-// 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 stack_trace.stack_zone_specification;
-
-import 'dart:async';
-
-import 'trace.dart';
-import 'chain.dart';
-
-/// A class encapsulating the zone specification for a [Chain.capture] zone.
-///
-/// Until they're materialized and exposed to the user, stack chains are tracked
-/// as linked lists of [Trace]s using the [_Node] class. These nodes are stored
-/// in three distinct ways:
-///
-/// * When a callback is registered, a node is created and stored as a captured
-///   local variable until the callback is run.
-///
-/// * When a callback is run, its captured node is set as the [_currentNode] so
-///   it can be available to [Chain.current] and to be linked into additional
-///   chains when more callbacks are scheduled.
-///
-/// * When a callback throws an error or a Future or Stream emits an error, the
-///   current node is associated with that error's stack trace using the
-///   [_chains] expando.
-///
-/// Since [ZoneSpecification] can't be extended or even implemented, in order to
-/// get a real [ZoneSpecification] instance it's necessary to call [toSpec].
-class StackZoneSpecification {
-  /// The expando that associates stack chains with [StackTrace]s.
-  ///
-  /// The chains are associated with stack traces rather than errors themselves
-  /// because it's a common practice to throw strings as errors, which can't be
-  /// used with expandos.
-  ///
-  /// The chain associated with a given stack trace doesn't contain a node for
-  /// that stack trace.
-  final _chains = new Expando<_Node>("stack chains");
-
-  /// The error handler for the zone.
-  ///
-  /// If this is null, that indicates that any unhandled errors should be passed
-  /// to the parent zone.
-  final ChainHandler _onError;
-
-  /// The most recent node of the current stack chain.
-  _Node _currentNode;
-
-  StackZoneSpecification([this._onError]);
-
-  /// Converts [this] to a real [ZoneSpecification].
-  ZoneSpecification toSpec() {
-    return new ZoneSpecification(
-        handleUncaughtError: handleUncaughtError,
-        registerCallback: registerCallback,
-        registerUnaryCallback: registerUnaryCallback,
-        registerBinaryCallback: registerBinaryCallback,
-        errorCallback: errorCallback);
-  }
-
-  /// Returns the current stack chain.
-  ///
-  /// By default, the first frame of the first trace will be the line where
-  /// [currentChain] is called. If [level] is passed, the first trace will start
-  /// that many frames up instead.
-  Chain currentChain([int level=0]) => _createNode(level + 1).toChain();
-
-  /// Returns the stack chain associated with [trace], if one exists.
-  ///
-  /// The first stack trace in the returned chain will always be [trace]
-  /// (converted to a [Trace] if necessary). If there is no chain associated
-  /// with [trace], this just returns a single-trace chain containing [trace].
-  Chain chainFor(StackTrace trace) {
-    if (trace is Chain) return trace;
-    var previous = trace == null ? null : _chains[trace];
-    return new _Node(trace, previous).toChain();
-  }
-
-  /// Ensures that an error emitted by [future] has the correct stack
-  /// information associated with it.
-  ///
-  /// By default, the first frame of the first trace will be the line where
-  /// [trackFuture] is called. If [level] is passed, the first trace will start
-  /// that many frames up instead.
-  Future trackFuture(Future future, [int level=0]) {
-    var completer = new Completer.sync();
-    var node = _createNode(level + 1);
-    future.then(completer.complete).catchError((e, stackTrace) {
-      if (stackTrace == null) stackTrace = new Trace.current();
-      if (stackTrace is! Chain && _chains[stackTrace] == null) {
-        _chains[stackTrace] = node;
-      }
-      completer.completeError(e, stackTrace);
-    });
-    return completer.future;
-  }
-
-  /// Ensures that any errors emitted by [stream] have the correct stack
-  /// information associated with them.
-  ///
-  /// By default, the first frame of the first trace will be the line where
-  /// [trackStream] is called. If [level] is passed, the first trace will start
-  /// that many frames up instead.
-  Stream trackStream(Stream stream, [int level=0]) {
-    var node = _createNode(level + 1);
-    return stream.transform(new StreamTransformer.fromHandlers(
-        handleError: (error, stackTrace, sink) {
-      if (stackTrace == null) stackTrace = new Trace.current();
-      if (stackTrace is! Chain && _chains[stackTrace] == null) {
-        _chains[stackTrace] = node;
-      }
-      sink.addError(error, stackTrace);
-    }));
-  }
-
-  /// Tracks the current stack chain so it can be set to [_currentChain] when
-  /// [f] is run.
-  ZoneCallback registerCallback(Zone self, ZoneDelegate parent, Zone zone,
-      Function f) {
-    if (f == null) return parent.registerCallback(zone, null);
-    var node = _createNode(1);
-    return parent.registerCallback(zone, () => _run(f, node));
-  }
-
-  /// Tracks the current stack chain so it can be set to [_currentChain] when
-  /// [f] is run.
-  ZoneUnaryCallback registerUnaryCallback(Zone self, ZoneDelegate parent,
-      Zone zone, Function f) {
-    if (f == null) return parent.registerUnaryCallback(zone, null);
-    var node = _createNode(1);
-    return parent.registerUnaryCallback(zone, (arg) {
-      return _run(() => f(arg), node);
-    });
-  }
-
-  /// Tracks the current stack chain so it can be set to [_currentChain] when
-  /// [f] is run.
-  ZoneBinaryCallback registerBinaryCallback(Zone self, ZoneDelegate parent,
-      Zone zone, Function f) {
-    if (f == null) return parent.registerBinaryCallback(zone, null);
-    var node = _createNode(1);
-    return parent.registerBinaryCallback(zone, (arg1, arg2) {
-      return _run(() => f(arg1, arg2), node);
-    });
-  }
-
-  /// Looks up the chain associated with [stackTrace] and passes it either to
-  /// [_onError] or [parent]'s error handler.
-  handleUncaughtError(Zone self, ZoneDelegate parent, Zone zone, error,
-      StackTrace stackTrace) {
-    var stackChain = chainFor(stackTrace);
-    if (_onError == null) {
-      return parent.handleUncaughtError(zone, error, stackChain);
-    }
-
-    // TODO(nweiz): Currently this copies a lot of logic from [runZoned]. Just
-    // allow [runBinary] to throw instead once issue 18134 is fixed.
-    try {
-      return parent.runBinary(zone, _onError, error, stackChain);
-    } catch (newError, newStackTrace) {
-      if (identical(newError, error)) {
-        return parent.handleUncaughtError(zone, error, stackChain);
-      } else {
-        return parent.handleUncaughtError(zone, newError, newStackTrace);
-      }
-    }
-  }
-
-  /// Attaches the current stack chain to [stackTrace], replacing it if
-  /// necessary.
-  AsyncError errorCallback(Zone self, ZoneDelegate parent, Zone zone,
-      Object error, StackTrace stackTrace) {
-    // Go up two levels to get through [_CustomZone.errorCallback].
-    if (stackTrace == null) {
-      stackTrace = _createNode(2).toChain();
-    } else {
-      if (_chains[stackTrace] == null) _chains[stackTrace] = _createNode(2);
-    }
-
-    var asyncError = parent.errorCallback(zone, error, stackTrace);
-    return asyncError == null ? new AsyncError(error, stackTrace) : asyncError;
-  }
-
-  /// Creates a [_Node] with the current stack trace and linked to
-  /// [_currentNode].
-  ///
-  /// By default, the first frame of the first trace will be the line where
-  /// [_createNode] is called. If [level] is passed, the first trace will start
-  /// that many frames up instead.
-  _Node _createNode([int level=0]) =>
-    new _Node(new Trace.current(level + 1), _currentNode);
-
-  // TODO(nweiz): use a more robust way of detecting and tracking errors when
-  // issue 15105 is fixed.
-  /// Runs [f] with [_currentNode] set to [node].
-  ///
-  /// If [f] throws an error, this associates [node] with that error's stack
-  /// trace.
-  _run(Function f, _Node node) {
-    var previousNode = _currentNode;
-    _currentNode = node;
-    try {
-      return f();
-    } catch (e, stackTrace) {
-      _chains[stackTrace] = node;
-      rethrow;
-    } finally {
-      _currentNode = previousNode;
-    }
-  }
-}
-
-/// A linked list node representing a single entry in a stack chain.
-class _Node {
-  /// The stack trace for this link of the chain.
-  final Trace trace;
-
-  /// The previous node in the chain.
-  final _Node previous;
-
-  _Node(StackTrace trace, [this.previous])
-      : trace = trace == null ? new Trace.current() : new Trace.from(trace);
-
-  /// Converts this to a [Chain].
-  Chain toChain() {
-    var nodes = <Trace>[];
-    var node = this;
-    while (node != null) {
-      nodes.add(node.trace);
-      node = node.previous;
-    }
-    return new Chain(nodes);
-  }
-}