pkg/mock: restructure library layout

pkg/mock/lib/src/result_matcher.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 mock.result_matcher;
+
+import 'package:matcher/matcher.dart';
+
+import 'action.dart';
+import 'log_entry.dart';
+
+/**
+ * [_ResultMatcher]s are used to make assertions about the results
+ * of method calls. These can be used as optional parameters to [getLogs].
+ */
+class _ResultMatcher extends Matcher {
+  final Action action;
+  final Matcher value;
+
+  const _ResultMatcher(this.action, this.value);
+
+  bool matches(item, Map matchState) {
+    if (item is! LogEntry) {
+     return false;
+    }
+    // normalize the action; _PROXY is like _RETURN.
+    Action eaction = item.action;
+    if (eaction == Action.PROXY) {
+      eaction = Action.RETURN;
+    }
+    return (eaction == action && value.matches(item.value, matchState));
+  }
+
+  Description describe(Description description) {
+    description.add(' to ');
+    if (action == Action.RETURN || action == Action.PROXY)
+      description.add('return ');
+    else
+      description.add('throw ');
+    return description.addDescriptionOf(value);
+  }
+
+  Description describeMismatch(item, Description mismatchDescription,
+                               Map matchState, bool verbose) {
+    if (item.action == Action.RETURN || item.action == Action.PROXY) {
+      mismatchDescription.add('returned ');
+    } else {
+      mismatchDescription.add('threw ');
+    }
+    mismatchDescription.add(item.value);
+    return mismatchDescription;
+  }
+}
+
+/**
+ *[returning] matches log entries where the call to a method returned
+ * a value that matched [value].
+ */
+Matcher returning(value) =>
+    new _ResultMatcher(Action.RETURN, wrapMatcher(value));
+
+/**
+ *[throwing] matches log entrues where the call to a method threw
+ * a value that matched [value].
+ */
+Matcher throwing(value) =>
+    new _ResultMatcher(Action.THROW, wrapMatcher(value));