tests/lib/mirrors/metadata_test.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.

@fisk @symbol
library test.metadata_test;

import 'dart:mirrors';

const fisk = 'a metadata string';

const symbol = const Symbol('fisk');

@symbol @fisk
class MyClass {
}

checkMetadata(DeclarationMirror mirror, List expectedMetadata) {
  List metadata = mirror.metadata.map((m) => m.reflectee).toList();
  if (metadata == null) {
    throw 'Null metadata on $mirror';
  }
  int expectedLength = expectedMetadata.length;
  int actualLength = metadata.length;
  if (expectedLength != actualLength) {
    throw 'Expected length = $expectedLength, but got length = $actualLength.';
  }
  for (int i = 0; i < expectedLength; i++) {
    if (metadata[i] != expectedMetadata[i]) {
      throw '${metadata[i]} is not "${expectedMetadata[i]}"'
          ' in $mirror at index $i';
    }
  }
  print(metadata);
}

main() {
  if (MirrorSystem.getName(symbol) != 'fisk') {
    // This happened in dart2js due to how early library metadata is
    // computed.
    throw 'Bad constant: $symbol';
  }

  MirrorSystem mirrors = currentMirrorSystem();
  checkMetadata(mirrors.findLibrary(const Symbol('test.metadata_test')).first,
                [fisk, symbol]);
  checkMetadata(reflect(new MyClass()).type, [symbol, fisk]);
}