Linter Demo

Errors: 10

Warnings: 29

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/util/maplet.dart

// 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 dart2js.util.maplet; import 'dart:collection' show MapBase, IterableBase; class Maplet<K, V> extends MapBase<K, V> { static const _MARKER = const _MapletMarker(); static const CAPACITY = 8; // The maplet can be in one of four states: // // * Empty (extra: null, key: marker, value: null) // * Single element (extra: null, key: key, value: value) // * List-backed (extra: length, key: list, value: null) // * Map-backed (extra: marker, key: map, value: null) // // When the maplet is list-backed, the list has two sections: One // for keys and one for values. The first [CAPACITY] entries are // the keys and they may contain markers for deleted elements. After // the keys there are [CAPACITY] entries for the values. var _key = _MARKER; var _value; var _extra; Maplet(); Maplet.from(Maplet<K, V> other) { other.forEach((K key, V value) { this[key] = value; }); } bool get isEmpty { if (_extra == null) { return _MARKER == _key; } else if (_MARKER == _extra) { return _key.isEmpty; } else { return _extra == 0; } } int get length { if (_extra == null) { return (_MARKER == _key) ? 0 : 1; } else if (_MARKER == _extra) { return _key.length; } else { return _extra; } } bool containsKey(K key) { if (_extra == null) { return _key == key; } else if (_MARKER == _extra) { return _key.containsKey(key); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _key[i]; if (_MARKER == candidate) continue; if (candidate == key) return true; remaining--; } return false; } } V operator [](K key) { if (_extra == null) { return (_key == key) ? _value : null; } else if (_MARKER == _extra) { return _key[key]; } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _key[i]; if (_MARKER == candidate) continue; if (candidate == key) return _key[i + CAPACITY]; remaining--; } return null; } } void operator []=(K key, V value) { if (_extra == null) { if (_MARKER == _key) { _key = key; _value = value; } else if (_key == key) { _value = value; } else { List list = new List(CAPACITY * 2); list[0] = _key; list[1] = key; list[CAPACITY] = _value; list[CAPACITY + 1] = value; _key = list; _value = null; _extra = 2; // Two elements. } } else if (_MARKER == _extra) { _key[key] = value; } else { int remaining = _extra; int index = 0; int copyTo, copyFrom; while (remaining > 0 && index < CAPACITY) { var candidate = _key[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) { copyFrom++; } else { copyTo = index; copyFrom = index + 1; } } else if (candidate == key) { _key[CAPACITY + index] = value; return; } else { // Skipped an element that didn't match. remaining--; } index++; } if (index < CAPACITY) { _key[index] = key; _key[CAPACITY + index] = value; _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) { _key[copyTo] = _key[copyFrom]; _key[CAPACITY + copyTo] = _key[CAPACITY + copyFrom]; copyTo++; copyFrom++; } // Insert the new element as the last element. _key[copyTo] = key; _key[CAPACITY + copyTo] = value; copyTo++; // Add one to the length encoded in the extra field. _extra++; // Clear all elements after the new last elements to // make sure we don't keep extra stuff alive. while (copyTo < CAPACITY) { _key[copyTo] = _key[CAPACITY + copyTo] = null; copyTo++; } } else { Map map = new Map(); forEach((eachKey, eachValue) => map[eachKey] = eachValue); map[key] = value; _key = map; _extra = _MARKER; } } } V remove(K key) { if (_extra == null) { if (_key != key) return null; _key = _MARKER; V result = _value; _value = null; return result; } else if (_MARKER == _extra) { return _key.remove(key); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _key[i]; if (_MARKER == candidate) continue; if (candidate == key) { int valueIndex = CAPACITY + i; var result = _key[valueIndex]; _key[i] = _MARKER; _key[valueIndex] = null; _extra--; return result; } remaining--; } return null; } } void forEach(void action(K key, V value)) { if (_extra == null) { if (_MARKER != _key) action(_key, _value); } else if (_MARKER == _extra) { _key.forEach(action); } else { for (int remaining = _extra, i = 0; remaining > 0 && i < CAPACITY; i++) { var candidate = _key[i]; if (_MARKER == candidate) continue; action(candidate, _key[CAPACITY + i]); remaining--; } } } void clear() { _key = _MARKER; _value = _extra = null; } Iterable<K> get keys => new _MapletKeyIterable<K>(this); } class _MapletMarker { const _MapletMarker(); } class _MapletKeyIterable<K> extends IterableBase<K> { final Maplet<K, dynamic> maplet; _MapletKeyIterable(this.maplet); Iterator<K> get iterator { if (maplet._extra == null) { return new _MapletSingleIterator<K>(maplet._key); } else if (Maplet._MARKER == maplet._extra) { return maplet._key.keys.iterator; } else { return new _MapletListIterator<K>(maplet._key, maplet._extra); } } } class _MapletSingleIterator<K> implements Iterator<K> { var _element; K _current; _MapletSingleIterator(this._element); K get current => _current; bool moveNext() { if (Maplet._MARKER == _element) { _current = null; return false; } _current = _element; _element = Maplet._MARKER; return true; } } class _MapletListIterator<K> implements Iterator<K> { final List _list; int _remaining; int _index = 0; K _current; _MapletListIterator(this._list, this._remaining); K get current => _current; bool moveNext() { while (_remaining > 0) { var candidate = _list[_index++]; if (Maplet._MARKER != candidate) { _current = candidate; _remaining--; return true; } } _current = null; return false; } }