Roll Observatory packages and add a roll script

matcher/lib/mirror_matchers.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.
-
-/// The mirror matchers library provides some additional matchers that
-/// make use of `dart:mirrors`.
-library matcher.mirror_matchers;
-
-import 'dart:mirrors';
-
-import 'matcher.dart';
-
-/// Returns a matcher that checks if a class instance has a property
-/// with name [name], and optionally, if that property in turn satisfies
-/// a [matcher].
-Matcher hasProperty(String name, [matcher]) =>
-    new _HasProperty(name, matcher == null ? null : wrapMatcher(matcher));
-
-class _HasProperty extends Matcher {
-  final String _name;
-  final Matcher _matcher;
-
-  const _HasProperty(this._name, [this._matcher]);
-
-  bool matches(item, Map matchState) {
-    var mirror = reflect(item);
-    var classMirror = mirror.type;
-    var symbol = new Symbol(_name);
-    var candidate = classMirror.declarations[symbol];
-    if (candidate == null) {
-      addStateInfo(matchState, {'reason': 'has no property named "$_name"'});
-      return false;
-    }
-    bool isInstanceField = candidate is VariableMirror && !candidate.isStatic;
-    bool isInstanceGetter =
-        candidate is MethodMirror && candidate.isGetter && !candidate.isStatic;
-    if (!(isInstanceField || isInstanceGetter)) {
-      addStateInfo(matchState, {
-        'reason':
-            'has a member named "$_name", but it is not an instance property'
-      });
-      return false;
-    }
-    if (_matcher == null) return true;
-    var result = mirror.getField(symbol);
-    var resultMatches = _matcher.matches(result.reflectee, matchState);
-    if (!resultMatches) {
-      addStateInfo(matchState, {'value': result.reflectee});
-    }
-    return resultMatches;
-  }
-
-  Description describe(Description description) {
-    description.add('has property "$_name"');
-    if (_matcher != null) {
-      description.add(' which matches ').addDescriptionOf(_matcher);
-    }
-    return description;
-  }
-
-  Description describeMismatch(
-      item, Description mismatchDescription, Map matchState, bool verbose) {
-    var reason = matchState == null ? null : matchState['reason'];
-    if (reason != null) {
-      mismatchDescription.add(reason);
-    } else {
-      mismatchDescription
-          .add('has property "$_name" with value ')
-          .addDescriptionOf(matchState['value']);
-      var innerDescription = new StringDescription();
-      _matcher.describeMismatch(
-          matchState['value'], innerDescription, matchState['state'], verbose);
-      if (innerDescription.length > 0) {
-        mismatchDescription.add(' which ').add(innerDescription.toString());
-      }
-    }
-    return mismatchDescription;
-  }
-}