Support nested matchers in deep equality matching.

pkg/unittest/lib/src/pretty_print.dart

 // 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 unittest.pretty_print;
 
+import '../matcher.dart';

[Siggi Cherem (dart-lang), 2014/02/28 02:41:04]

use package: ?

[Bob Nystrom, 2014/02/28 17:31:24]

Do you think that's better? It seems a bit weird to do that when the next line
doesn't.

[Siggi Cherem (dart-lang), 2014/02/28 17:37:19]

Not really.

I think in general is a bad idea to use '../'. I feel that generally people have
a good understanding of what's deeper inside a package, but not so much of
what's above it.

 import 'utils.dart';
 
 /**
  * Returns a pretty-printed representation of [object].
  *
  * If [maxLineLength] is passed, this will attempt to ensure that each line is
  * no longer than [maxLineLength] characters long. This isn't guaranteed, since
  * individual objects may have string representations that are too long, but
  * most lines will be less than [maxLineLength] long.
  *
  * If [maxItems] is passed, [Iterable]s and [Map]s will only print their first
  * [maxItems] members or key/value pairs, respectively.
  */
 String prettyPrint(object, {int maxLineLength, int maxItems}) {
   String _prettyPrint(object, int indent, Set seen, bool top) {
+    // If the object is a matcher, use its description.
+    if (object is Matcher) {
+      var description = new StringDescription();
+      object.describe(description);
+      return "<$description>";
+    }
+
     // Avoid looping infinitely on recursively-nested data structures.
     if (seen.contains(object)) return "(recursive)";
     seen = seen.union(new Set.from([object]));
     String pp(child) => _prettyPrint(child, indent + 2, seen, false);
 
     if (object is Iterable) {
       // Print the type name for non-List iterables.
       var type = object is List ? "" : typeName(object) + ":";
 
       // Truncate the list of strings if it's longer than [maxItems].
@@ skipping 61 matching lines @@
       } else {
         return "${typeName(object)}:$value";
       }
     }
   }
 
   return _prettyPrint(object, 0, new Set(), true);
 }
 
 String _indent(int length) => new List.filled(length, ' ').join('');