Teach dart_package to understand the packages/ subdirectory

third_party/dart-packages/stack_trace/stack_trace/src/chain.dart

Index: third_party/dart-packages/stack_trace/stack_trace/src/chain.dart
diff --git a/third_party/dart-packages/stack_trace/stack_trace/src/chain.dart b/third_party/dart-packages/stack_trace/stack_trace/src/chain.dart
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-// 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.chain;
-
-import 'dart:async';
-import 'dart:collection';
-
-import 'frame.dart';
-import 'stack_zone_specification.dart';
-import 'trace.dart';
-import 'utils.dart';
-
-/// A function that handles errors in the zone wrapped by [Chain.capture].
-typedef void ChainHandler(error, Chain chain);
-
-/// A chain of stack traces.
-///
-/// A stack chain is a collection of one or more stack traces that collectively
-/// represent the path from [main] through nested function calls to a particular
-/// code location, usually where an error was thrown. Multiple stack traces are
-/// necessary when using asynchronous functions, since the program's stack is
-/// reset before each asynchronous callback is run.
-///
-/// Stack chains can be automatically tracked using [Chain.capture]. This sets
-/// up a new [Zone] in which the current stack chain is tracked and can be
-/// accessed using [new Chain.current]. Any errors that would be top-leveled in
-/// the zone can be handled, along with their associated chains, with the
-/// `onError` callback. For example:
-///
-///     Chain.capture(() {
-///       // ...
-///     }, onError: (error, stackChain) {
-///       print("Caught error $error\n"
-///             "$stackChain");
-///     });
-class Chain implements StackTrace {
-  /// The line used in the string representation of stack chains to represent
-  /// the gap between traces.
-  static const _GAP = '===== asynchronous gap ===========================\n';
-
-  /// The stack traces that make up this chain.
-  ///
-  /// Like the frames in a stack trace, the traces are ordered from most local
-  /// to least local. The first one is the trace where the actual exception was
-  /// raised, the second one is where that callback was scheduled, and so on.
-  final List<Trace> traces;
-
-  /// The [StackZoneSpecification] for the current zone.
-  static StackZoneSpecification get _currentSpec =>
-    Zone.current[#stack_trace.stack_zone.spec];
-
-  /// Runs [callback] in a [Zone] in which the current stack chain is tracked
-  /// and automatically associated with (most) errors.
-  ///
-  /// If [onError] is passed, any error in the zone that would otherwise go
-  /// unhandled is passed to it, along with the [Chain] associated with that
-  /// error. Note that if [callback] produces multiple unhandled errors,
-  /// [onError] may be called more than once. If [onError] isn't passed, the
-  /// parent Zone's `unhandledErrorHandler` will be called with the error and
-  /// its chain.
-  ///
-  /// Note that even if [onError] isn't passed, this zone will still be an error
-  /// zone. This means that any errors that would cross the zone boundary are
-  /// considered unhandled.
-  ///
-  /// If [callback] returns a value, it will be returned by [capture] as well.
-  ///
-  /// Currently, capturing stack chains doesn't work when using dart2js due to
-  /// issues [15171] and [15105]. Stack chains reported on dart2js will contain
-  /// only one trace.
-  ///
-  /// [15171]: https://code.google.com/p/dart/issues/detail?id=15171
-  /// [15105]: https://code.google.com/p/dart/issues/detail?id=15105
-  static capture(callback(), {ChainHandler onError}) {
-    var spec = new StackZoneSpecification(onError);
-    return runZoned(() {
-      try {
-        return callback();
-      } catch (error, stackTrace) {
-        // TODO(nweiz): Don't special-case this when issue 19566 is fixed.
-        return Zone.current.handleUncaughtError(error, stackTrace);
-      }
-    }, zoneSpecification: spec.toSpec(), zoneValues: {
-      #stack_trace.stack_zone.spec: spec
-    });
-  }
-
-  /// Returns [futureOrStream] unmodified.
-  ///
-  /// Prior to Dart 1.7, this was necessary to ensure that stack traces for
-  /// exceptions reported with [Completer.completeError] and
-  /// [StreamController.addError] were tracked correctly.
-  @Deprecated("Chain.track is not necessary in Dart 1.7+.")
-  static track(futureOrStream) => futureOrStream;
-
-  /// Returns the current stack chain.
-  ///
-  /// By default, the first frame of the first trace will be the line where
-  /// [Chain.current] is called. If [level] is passed, the first trace will
-  /// start that many frames up instead.
-  ///
-  /// If this is called outside of a [capture] zone, it just returns a
-  /// single-trace chain.
-  factory Chain.current([int level=0]) {
-    if (_currentSpec != null) return _currentSpec.currentChain(level + 1);
-    return new Chain([new Trace.current(level + 1)]);
-  }
-
-  /// Returns the stack chain associated with [trace].
-  ///
-  /// 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] or if this is called outside of a [capture] zone, this just
-  /// returns a single-trace chain containing [trace].
-  ///
-  /// If [trace] is already a [Chain], it will be returned as-is.
-  factory Chain.forTrace(StackTrace trace) {
-    if (trace is Chain) return trace;
-    if (_currentSpec == null) return new Chain([new Trace.from(trace)]);
-    return _currentSpec.chainFor(trace);
-  }
-
-  /// Parses a string representation of a stack chain.
-  ///
-  /// Specifically, this parses the output of [Chain.toString].
-  factory Chain.parse(String chain) =>
-    new Chain(chain.split(_GAP).map((trace) => new Trace.parseFriendly(trace)));
-
-  /// Returns a new [Chain] comprised of [traces].
-  Chain(Iterable<Trace> traces)
-      : traces = new UnmodifiableListView<Trace>(traces.toList());
-
-  /// Returns a terser version of [this].
-  ///
-  /// This calls [Trace.terse] on every trace in [traces], and discards any
-  /// trace that contain only internal frames.
-  Chain get terse => foldFrames((_) => false, terse: true);
-
-  /// Returns a new [Chain] based on [this] where multiple stack frames matching
-  /// [predicate] are folded together.
-  ///
-  /// This means that whenever there are multiple frames in a row that match
-  /// [predicate], only the last one is kept. In addition, traces that are
-  /// composed entirely of frames matching [predicate] are omitted.
-  ///
-  /// This is useful for limiting the amount of library code that appears in a
-  /// stack trace by only showing user code and code that's called by user code.
-  ///
-  /// If [terse] is true, this will also fold together frames from the core
-  /// library or from this package, and simplify core library frames as in
-  /// [Trace.terse].
-  Chain foldFrames(bool predicate(Frame frame), {bool terse: false}) {
-    var foldedTraces = traces.map(
-        (trace) => trace.foldFrames(predicate, terse: terse));
-    var nonEmptyTraces = foldedTraces.where((trace) {
-      // Ignore traces that contain only folded frames. These traces will be
-      // folded into a single frame each.
-      return trace.frames.length > 1;
-    });
-
-    // If all the traces contain only internal processing, preserve the last
-    // (top-most) one so that the chain isn't empty.
-    if (nonEmptyTraces.isEmpty && foldedTraces.isNotEmpty) {
-      return new Chain([foldedTraces.last]);
-    }
-
-    return new Chain(nonEmptyTraces);
-  }
-
-  /// Converts [this] to a [Trace].
-  ///
-  /// The trace version of a chain is just the concatenation of all the traces
-  /// in the chain.
-  Trace toTrace() => new Trace(flatten(traces.map((trace) => trace.frames)));
-
-  String toString() => traces.join(_GAP);
-}