Revert "Hide collection-dev library."

sdk/lib/_collection_dev/iterable.dart

Index: sdk/lib/_collection_dev/iterable.dart
diff --git a/sdk/lib/_collection_dev/iterable.dart b/sdk/lib/_collection_dev/iterable.dart
deleted file mode 100644
index 89b9e6d4aab3f32e32f475686353a3773d55d1b6..0000000000000000000000000000000000000000
--- a/sdk/lib/_collection_dev/iterable.dart
+++ /dev/null
@@ -1,683 +0,0 @@
-// Copyright (c) 2011, 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.
-
-part of dart._collection.dev;
-
-typedef T _Transformation<S, T>(S value);
-
-class MappedIterable<S, T> extends Iterable<T> {
-  final Iterable<S> _iterable;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _Transformation<S, T> */ _f;
-
-  MappedIterable(this._iterable, T this._f(S element));
-
-  Iterator<T> get iterator => new MappedIterator<S, T>(_iterable.iterator, _f);
-
-  // Length related functions are independent of the mapping.
-  int get length => _iterable.length;
-  bool get isEmpty => _iterable.isEmpty;
-}
-
-
-class MappedIterator<S, T> extends Iterator<T> {
-  T _current;
-  final Iterator<S> _iterator;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _Transformation<S, T> */ _f;
-
-  MappedIterator(this._iterator, T this._f(S element));
-
-  bool moveNext() {
-    if (_iterator.moveNext()) {
-      _current = _f(_iterator.current);
-      return true;
-    } else {
-      _current = null;
-      return false;
-    }
-  }
-
-  T get current => _current;
-}
-
-/** Specialized alternative to [MappedIterable] for mapped [List]s. */
-class MappedListIterable<S, T> extends Iterable<T> {
-  final List<S> _list;
-  /**
-   * Start index of the part of the list to map.
-   *
-   * Allows mapping only a sub-list of an existing list.
-   *
-   * Used to implement lazy skip/take on a [MappedListIterable].
-   */
-  final int _start;
-
-  /**
-   * End index of the part of the list to map.
-   *
-   * If null, always use the length of the list.
-   */
-  final int _end;
-
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _Transformation<S, T> */ _f;
-
-  MappedListIterable(this._list, T this._f(S element), this._start, this._end) {
-    if (_end != null && _end < _start) {
-      throw new ArgumentError("End ($_end) before start ($_start)");
-    }
-  }
-
-  /** The start index, limited to the current length of the list. */
-  int get _startIndex {
-    if (_start <= _list.length) return _start;
-    return _list.length;
-  }
-
-  /** The end index, if given, limited to the current length of the list. */
-  int get _endIndex {
-    if (_end == null || _end > _list.length) return _list.length;
-    return _end;
-  }
-
-  Iterator<T> get iterator =>
-      new MappedListIterator<S, T>(_list, _f, _startIndex, _endIndex);
-
-  void forEach(void action(T element)) {
-    int length = _list.length;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      action(_f(_list[i]));
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-  }
-
-  bool get isEmpty => _startIndex == _endIndex;
-
-  int get length => _endIndex - _startIndex;
-
-  T get first {
-    int start = _startIndex;
-    if (start == _endIndex) {
-      throw new StateError("No elements");
-    }
-    return _f(_list.elementAt(start));
-  }
-
-  T get last {
-    int end = _endIndex;
-    if (end == _startIndex) {
-      throw new StateError("No elements");
-    }
-    return _f(_list.elementAt(end - 1));
-  }
-
-  T get single {
-    int start = _startIndex;
-    int end = _endIndex;
-    if (start != end - 1) {
-      if (start == end) {
-        throw new StateError("No elements");
-      }
-      throw new StateError("Too many elements");
-    }
-    return _f(_list[start]);
-  }
-
-  T elementAt(int index) {
-    index += _startIndex;
-    if (index >= _endIndex) {
-      throw new StateError("No matching element");
-    }
-    return _f(_list.elementAt(index));
-  }
-
-  bool contains(T element) {
-    int length = _list.length;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      if (_f(_list[i]) == element) {
-        return true;
-      }
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return false;
-  }
-
-  bool every(bool test(T element)) {
-    int length = _list.length;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      if (!test(_f(_list[i]))) return false;
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return true;
-  }
-
-  bool any(bool test(T element)) {
-    int length = _list.length;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      if (test(_f(_list[i]))) return true;
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return false;
-  }
-
-  T firstMatching(bool test(T element), { T orElse() }) {
-    int length = _list.length;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      T value = _f(_list[i]);
-      if (test(value)) return value;
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    if (orElse != null) return orElse();
-    throw new StateError("No matching element");
-  }
-
-  T lastMatching(bool test(T element), { T orElse() }) {
-    int length = _list.length;
-    for (int i = _endIndex - 1, start = _startIndex; i >= start; i++) {
-      T value = _f(_list[i]);
-      if (test(value)) return value;
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    if (orElse != null) return orElse();
-    throw new StateError("No matching element");
-  }
-
-  T singleMatching(bool test(T element)) {
-    int length = _list.length;
-    T match;
-    bool matchFound = false;
-    for (int i = _startIndex, n = _endIndex; i < n; i++) {
-      T value = _f(_list[i]);
-      if (test(value)) {
-        if (matchFound) {
-          throw new StateError("More than one matching element");
-        }
-        matchFound = true;
-        match = value;
-      }
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    if (matchFound) return match;
-    throw new StateError("No matching element");
-  }
-
-  T min([int compare(T a, T b)]) {
-    if (compare == null) {
-      var defaultCompare = Comparable.compare;
-      compare = defaultCompare;
-    }
-    int length = _list.length;
-    int start = _startIndex;
-    int end = _endIndex;
-    if (start == end) return null;
-    T value = _f(_list[start]);
-    if (_list.length != length) {
-      throw new ConcurrentModificationError(_list);
-    }
-    for (int i = start + 1; i < end; i++) {
-      T nextValue = _f(_list[i]);
-      if (compare(value, nextValue) > 0) {
-        value = nextValue;
-      }
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return value;
-  }
-
-  T max([int compare(T a, T b)]) {
-    if (compare == null) {
-      var defaultCompare = Comparable.compare;
-      compare = defaultCompare;
-    }
-    int length = _list.length;
-    int start = _startIndex;
-    int end = _endIndex;
-    if (start == end) return null;
-    T value = _f(_list[start]);
-    if (_list.length != length) {
-      throw new ConcurrentModificationError(_list);
-    }
-    for (int i = start + 1; i < end; i++) {
-      T nextValue = _f(_list[i]);
-      if (compare(value, nextValue) < 0) {
-        value = nextValue;
-      }
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return value;
-  }
-
-  String join([String separator]) {
-    int start = _startIndex;
-    int end = _endIndex;
-    if (start == end) return "";
-    StringBuffer buffer = new StringBuffer("${_f(_list[start])}");
-    if (_list.length != length) {
-      throw new ConcurrentModificationError(_list);
-    }
-    for (int i = start + 1; i < end; i++) {
-      buffer.add(separator);
-      buffer.add("${_f(_list[i])}");
-      if (_list.length != length) {
-        throw new ConcurrentModificationError(_list);
-      }
-    }
-    return buffer.toString();
-  }
-
-  Iterable<T> where(bool test(T element)) => super.where(test);
-
-  Iterable map(f(T element)) {
-    return new MappedListIterable(_list, (S v) => f(_f(v)), _start, _end);
-  }
-
-  Iterable mappedBy(f(T element)) => map(f);
-
-  reduce(var initialValue, combine(var previousValue, T element)) {
-    return _list.reduce(initialValue, (v, S e) => combine(v, _f(e)));
-  }
-
-  Iterable<T> skip(int count) {
-    int start = _startIndex + count;
-    if (_end != null && start >= _end) {
-      return new EmptyIterable<T>();
-    }
-    return new MappedListIterable(_list, _f, start, _end);
-  }
-
-  Iterable<T> skipWhile(bool test(T element)) => super.skipWhile(test);
-
-  Iterable<T> take(int count)  {
-    int newEnd = _start + count;
-    if (_end == null || newEnd < _end)  {
-      return new MappedListIterable(_list, _f, _start, newEnd);
-    }
-    // Equivalent to "this".
-    return new MappedListIterable(_list, _f, _start, _end);
-  }
-
-  Iterable<T> takeWhile(bool test(T element)) => super.takeWhile(test);
-
-  List<T> toList() {
-    List<T> result = new List<T>();
-    forEach(result.add);
-    return result;
-  }
-
-  Set<T> toSet() {
-    Set<T> result = new Set<T>();
-    forEach(result.add);
-    return result;
-  }
-}
-
-/**
- * Iterator for [MappedListIterable].
- *
- * A list iterator that iterates over (a sublist of) a list and
- * returns the values transformed by a function.
- *
- * As a list iterator, it throws if the length of the list has
- * changed during iteration.
- */
-class MappedListIterator<S, T> implements Iterator<T> {
-  List<S> _list;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _Transformation<S, T> */ _f;
-  final int _endIndex;
-  final int _length;
-  int _index;
-  T _current;
-
-  MappedListIterator(List<S> list, this._f, int start, this._endIndex)
-      : _list = list, _length = list.length, _index = start;
-
-  T get current => _current;
-
-  bool moveNext() {
-    if (_list.length != _length) {
-      throw new ConcurrentModificationError(_list);
-    }
-    if (_index >= _endIndex) {
-      _current = null;
-      return false;
-    }
-    _current = _f(_list[_index]);
-    _index++;
-    return true;
-  }
-}
-
-typedef bool _ElementPredicate<E>(E element);
-
-class WhereIterable<E> extends Iterable<E> {
-  final Iterable<E> _iterable;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-
-  WhereIterable(this._iterable, bool this._f(E element));
-
-  Iterator<E> get iterator => new WhereIterator<E>(_iterable.iterator, _f);
-}
-
-class WhereIterator<E> extends Iterator<E> {
-  final Iterator<E> _iterator;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-
-  WhereIterator(this._iterator, bool this._f(E element));
-
-  bool moveNext() {
-    while (_iterator.moveNext()) {
-      if (_f(_iterator.current)) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  E get current => _iterator.current;
-}
-
-typedef Iterable<T> _ExpandFunction<S, T>(S sourceElement);
-
-class ExpandIterable<S, T> extends Iterable<T> {
-  final Iterable<S> _iterable;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ExpandFunction */ _f;
-
-  ExpandIterable(this._iterable, Iterable<T> this._f(S element));
-
-  Iterator<T> get iterator => new ExpandIterator<S, T>(_iterable.iterator, _f);
-}
-
-class ExpandIterator<S, T> implements Iterator<T> {
-  final Iterator<S> _iterator;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ExpandFunction */ _f;
-  // Initialize _currentExpansion to an empty iterable. A null value
-  // marks the end of iteration, and we don't want to call _f before
-  // the first moveNext call.
-  Iterator<T> _currentExpansion = const EmptyIterator();
-  T _current;
-
-  ExpandIterator(this._iterator, Iterable<T> this._f(S element));
-
-  void _nextExpansion() {
-  }
-
-  T get current => _current;
-
-  bool moveNext() {
-    if (_currentExpansion == null) return false;
-    while (!_currentExpansion.moveNext()) {
-      _current = null;
-      if (_iterator.moveNext()) {
-        // If _f throws, this ends iteration. Otherwise _currentExpansion and
-        // _current will be set again below.
-        _currentExpansion = null;
-        _currentExpansion = _f(_iterator.current).iterator;
-      } else {
-        return false;
-      }
-    }
-    _current = _currentExpansion.current;
-    return true;
-  }
-}
-
-class TakeIterable<E> extends Iterable<E> {
-  final Iterable<E> _iterable;
-  final int _takeCount;
-
-  TakeIterable(this._iterable, this._takeCount) {
-    if (_takeCount is! int || _takeCount < 0) {
-      throw new ArgumentError(_takeCount);
-    }
-  }
-
-  Iterator<E> get iterator {
-    return new TakeIterator<E>(_iterable.iterator, _takeCount);
-  }
-}
-
-class TakeIterator<E> extends Iterator<E> {
-  final Iterator<E> _iterator;
-  int _remaining;
-
-  TakeIterator(this._iterator, this._remaining) {
-    assert(_remaining is int && _remaining >= 0);
-  }
-
-  bool moveNext() {
-    _remaining--;
-    if (_remaining >= 0) {
-      return _iterator.moveNext();
-    }
-    _remaining = -1;
-    return false;
-  }
-
-  E get current {
-    if (_remaining < 0) return null;
-    return _iterator.current;
-  }
-}
-
-class TakeWhileIterable<E> extends Iterable<E> {
-  final Iterable<E> _iterable;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-
-  TakeWhileIterable(this._iterable, bool this._f(E element));
-
-  Iterator<E> get iterator {
-    return new TakeWhileIterator<E>(_iterable.iterator, _f);
-  }
-}
-
-class TakeWhileIterator<E> extends Iterator<E> {
-  final Iterator<E> _iterator;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-  bool _isFinished = false;
-
-  TakeWhileIterator(this._iterator, bool this._f(E element));
-
-  bool moveNext() {
-    if (_isFinished) return false;
-    if (!_iterator.moveNext() || !_f(_iterator.current)) {
-      _isFinished = true;
-      return false;
-    }
-    return true;
-  }
-
-  E get current {
-    if (_isFinished) return null;
-    return _iterator.current;
-  }
-}
-
-class SkipIterable<E> extends Iterable<E> {
-  final Iterable<E> _iterable;
-  final int _skipCount;
-
-  SkipIterable(this._iterable, this._skipCount) {
-    if (_skipCount is! int || _skipCount < 0) {
-      throw new ArgumentError(_skipCount);
-    }
-  }
-
-  Iterable<E> skip(int n) {
-    if (n is! int || n < 0) {
-      throw new ArgumentError(n);
-    }
-    return new SkipIterable<E>(_iterable, _skipCount + n);
-  }
-
-  Iterator<E> get iterator {
-    return new SkipIterator<E>(_iterable.iterator, _skipCount);
-  }
-}
-
-class SkipIterator<E> extends Iterator<E> {
-  final Iterator<E> _iterator;
-  int _skipCount;
-
-  SkipIterator(this._iterator, this._skipCount) {
-    assert(_skipCount is int && _skipCount >= 0);
-  }
-
-  bool moveNext() {
-    for (int i = 0; i < _skipCount; i++) _iterator.moveNext();
-    _skipCount = 0;
-    return _iterator.moveNext();
-  }
-
-  E get current => _iterator.current;
-}
-
-class SkipWhileIterable<E> extends Iterable<E> {
-  final Iterable<E> _iterable;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-
-  SkipWhileIterable(this._iterable, bool this._f(E element));
-
-  Iterator<E> get iterator {
-    return new SkipWhileIterator<E>(_iterable.iterator, _f);
-  }
-}
-
-class SkipWhileIterator<E> extends Iterator<E> {
-  final Iterator<E> _iterator;
-  // TODO(ahe): Restore type when feature is implemented in dart2js
-  // checked mode. http://dartbug.com/7733
-  final /* _ElementPredicate */ _f;
-  bool _hasSkipped = false;
-
-  SkipWhileIterator(this._iterator, bool this._f(E element));
-
-  bool moveNext() {
-    if (!_hasSkipped) {
-      _hasSkipped = true;
-      while (_iterator.moveNext()) {
-        if (!_f(_iterator.current)) return true;
-      }
-    }
-    return _iterator.moveNext();
-  }
-
-  E get current => _iterator.current;
-}
-
-/**
- * The always empty [Iterable].
- */
-class EmptyIterable<E> extends Iterable<E> {
-  const EmptyIterable();
-
-  Iterator<E> get iterator => const EmptyIterator();
-
-  void forEach(void action(E element)) {}
-
-  bool get isEmpty => true;
-
-  int get length => 0;
-
-  E get first { throw new StateError("No elements"); }
-
-  E get last { throw new StateError("No elements"); }
-
-  E get single { throw new StateError("No elements"); }
-
-  E elementAt(int index) { throw new RangeError.value(index); }
-
-  bool contains(E element) => false;
-
-  bool every(bool test(E element)) => true;
-
-  bool any(bool test(E element)) => false;
-
-  E firstMatching(bool test(E element), { E orElse() }) {
-    if (orElse != null) return orElse();
-    throw new StateError("No matching element");
-  }
-
-  E lastMatching(bool test(E element), { E orElse() }) {
-    if (orElse != null) return orElse();
-    throw new StateError("No matching element");
-  }
-
-  E singleMatching(bool test(E element), { E orElse() }) {
-    if (orElse != null) return orElse();
-    throw new StateError("No matching element");
-  }
-
-  E min([int compare(E a, E b)]) => null;
-
-  E max([int compare(E a, E b)]) => null;
-
-  String join([String separator]) => "";
-
-  Iterable<E> where(bool test(E element)) => this;
-
-  Iterable map(f(E element)) => const EmptyIterable();
-
-  Iterable mappedBy(f(E element)) => const EmptyIterable();
-
-  reduce(var initialValue, combine(var previousValue, E element)) {
-    return initialValue;
-  }
-
-  Iterable<E> skip(int count) => this;
-
-  Iterable<E> skipWhile(bool test(E element)) => this;
-
-  Iterable<E> take(int count) => this;
-
-  Iterable<E> takeWhile(bool test(E element)) => this;
-
-  List toList() => <E>[];
-
-  Set toSet() => new Set<E>();
-}
-
-/** The always empty iterator. */
-class EmptyIterator<E> implements Iterator<E> {
-  const EmptyIterator();
-  bool moveNext() => false;
-  E get current => null;
-}