// 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 engine.utilities.dart;

import 'java_core.dart';

/**
 * Check whether [uri1] starts with (or 'is prefixed by') [uri2] by checking
 * path segments.
 */
bool startsWith(Uri uri1, Uri uri2) {
  List<String> uri1Segments = uri1.pathSegments;
  List<String> uri2Segments = uri2.pathSegments.toList();
  // Punt if empty (https://github.com/dart-lang/sdk/issues/24126)
  if (uri2Segments.isEmpty) {
    return false;
  }
  // Trim trailing empty segments ('/foo/' => ['foo', ''])
  if (uri2Segments.last == '') {
    uri2Segments.removeLast();
  }

  if (uri2Segments.length > uri1Segments.length) {
    return false;
  }

  for (int i = 0; i < uri2Segments.length; ++i) {
    if (uri2Segments[i] != uri1Segments[i]) {
      return false;
    }
  }
  return true;
}

/**
 * The enumeration `ParameterKind` defines the different kinds of parameters. There are two
 * basic kinds of parameters: required and optional. Optional parameters are further divided into
 * two kinds: positional optional and named optional.
 */
class ParameterKind extends Enum<ParameterKind> {
  static const ParameterKind REQUIRED =
      const ParameterKind('REQUIRED', 0, false);

  static const ParameterKind POSITIONAL =
      const ParameterKind('POSITIONAL', 1, true);

  static const ParameterKind NAMED = const ParameterKind('NAMED', 2, true);

  static const List<ParameterKind> values = const [REQUIRED, POSITIONAL, NAMED];

  /**
   * A flag indicating whether this is an optional parameter.
   */
  final bool isOptional;

  /**
   * Initialize a newly created kind with the given state.
   *
   * @param isOptional `true` if this is an optional parameter
   */
  const ParameterKind(String name, int ordinal, this.isOptional)
      : super(name, ordinal);
}