Linter Demo

Errors: 16

Warnings: 42

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/util/setlet.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 dart2js.util.setlet; import 'dart:collection' show IterableBase; class Setlet<E> extends IterableBase<E> implements Set<E> { static const _MARKER = const _SetletMarker(); static const CAPACITY = 8; // The setlet can be in one of four states: // // * Empty (extra: null, contents: marker) // * Single element (extra: null, contents: element) // * List-backed (extra: length, contents: list) // * Set-backed (extra: marker, contents: set) // // When the setlet is list-backed, the list in the contents field // may have empty slots filled with the marker value. var _contents = _MARKER; var _extra; Setlet(); Setlet.from(Iterable<E> elements) { addAll(elements); } Iterator<E> get iterator { if (_extra == null) { return new _SetletSingleIterator<E>(_contents); } else if (_MARKER == _extra) { return _contents.iterator; } else { return new _SetletListIterator<E>(_contents, _extra); } } int get length { if (_extra == null) { return (_MARKER == _contents) ? 0 : 1; } else if (_MARKER == _extra) { return _contents.length; } else { return _extra; } } bool get isEmpty { if (_extra == null) { return _MARKER == _contents; } else if (_MARKER == _extra) { return _contents.isEmpty; } else { return _extra == 0; } } bool contains(E element) { if (_extra == null) { return _contents == element; } else if (_MARKER == _extra) { return _contents.contains(element); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _contents[i]; if (_MARKER == candidate) continue; if (candidate == element) return true; remaining--; } return false; } } bool add(E element) { if (_extra == null) { if (_MARKER == _contents) { _contents = element; return true; } else if (_contents == element) { // Do nothing. return false; } else { List list = new List(CAPACITY); list[0] = _contents; list[1] = element; _contents = list; _extra = 2; // Two elements. return true; } } else if (_MARKER == _extra) { return _contents.add(element); } else { int remaining = _extra; int index = 0; int copyTo, copyFrom; while (remaining > 0 && index < CAPACITY) { var candidate = _contents[index++]; if (_MARKER == candidate) { // Keep track of the last range of empty slots in the // list. When we're done we'll move all the elements // after those empty slots down, so that adding an element // after that will preserve the insertion order. if (copyFrom == index - 1) { copyFrom++; } else { copyTo = index - 1; copyFrom = index; } continue; } else if (candidate == element) { return false; } remaining--; } if (index < CAPACITY) { _contents[index] = element; _extra++; } else if (_extra < CAPACITY) { // Move the last elements down into the last empty slots // so that we have empty slots after the last element. while (copyFrom < CAPACITY) { _contents[copyTo++] = _contents[copyFrom++]; } // Insert the new element as the last element. _contents[copyTo++] = element; _extra++; // Clear all elements after the new last elements to // make sure we don't keep extra stuff alive. while (copyTo < CAPACITY) _contents[copyTo++] = null; } else { _contents = new Set<E>()..addAll(_contents)..add(element); _extra = _MARKER; } return true; } } void addAll(Iterable<E> elements) { elements.forEach((each) => add(each)); } E lookup(Object element) { if (_extra == null) { return _contents == element ? _contents : null; } else if (_MARKER == _extra) { return _contents.lookup(element); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _contents[i]; if (_MARKER == candidate) continue; if (candidate == element) return candidate; remaining--; } return null; } } bool remove(Object element) { if (_extra == null) { if (_contents == element) { _contents = _MARKER; return true; } else { return false; } } else if (_MARKER == _extra) { return _contents.remove(element); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _contents[i]; if (_MARKER == candidate) continue; if (candidate == element) { _contents[i] = _MARKER; _extra--; return true; } remaining--; } return false; } } void removeAll(Iterable<Object> other) { other.forEach(remove); } void removeWhere(bool test(E element)) { if (_extra == null) { if (test(_contents)) { _contents = _MARKER; } } else if (_MARKER == _extra) { _contents.removeWhere(test); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _contents[i]; if (_MARKER == candidate) continue; if (test(candidate)) { _contents[i] = _MARKER; _extra--; } remaining--; } } } void retainWhere(bool test(E element)) { removeWhere((E element) => !test(element)); } void retainAll(Iterable<Object> elements) { Set set = elements is Set ? elements : elements.toSet(); removeWhere((E element) => !set.contains(element)); } void forEach(void action(E element)) { if (_extra == null) { if (_MARKER != _contents) action(_contents); } else if (_MARKER == _extra) { _contents.forEach(action); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var element = _contents[i]; if (_MARKER == element) continue; action(element); remaining--; } } } bool containsAll(Iterable<E> other) { for (E e in other) { if (!this.contains(e)) return false; }; return true; } clear() { _contents = _MARKER; _extra = null; } Set<E> union(Set<E> other) => new Set<E>.from(this)..addAll(other); Setlet<E> intersection(Set<E> other) => new Setlet<E>.from(this.where((e) => other.contains(e))); Setlet<E> difference(Set<E> other) => new Setlet<E>.from(this.where((e) => !other.contains(e))); Setlet<E> toSet() { Setlet<E> result = new Setlet<E>(); if (_extra == null) { result._contents = _contents; } else if (_extra == _MARKER) { result._extra = _MARKER; result._contents = _contents.toSet(); } else { result._extra = _extra; result._contents = _contents.toList(); } return result; } } class _SetletMarker { const _SetletMarker(); toString() => "-"; } class _SetletSingleIterator<E> implements Iterator<E> { var _element; E _current; _SetletSingleIterator(this._element); E get current => _current; bool moveNext() { if (Setlet._MARKER == _element) { _current = null; return false; } _current = _element; _element = Setlet._MARKER; return true; } } class _SetletListIterator<E> implements Iterator<E> { final List _list; int _remaining; int _index = 0; E _current; _SetletListIterator(this._list, this._remaining); E get current => _current; bool moveNext() { while (_remaining > 0) { var candidate = _list[_index++]; if (Setlet._MARKER != candidate) { _current = candidate; _remaining--; return true; } } _current = null; return false; } }