Linter Demo

Errors: 4

Warnings: 53

File: /home/fstrocco/Dart/dart/benchmark/analyzer/lib/src/generated/utilities_collection.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. // This code was auto-generated, is not intended to be edited, and is subject to // significant change. Please see the README file for more information. library engine.utilities.collection; import "dart:math" as math; import 'dart:collection'; import 'java_core.dart'; import 'scanner.dart' show Token; /** * The class `BooleanArray` defines methods for operating on integers as if they were arrays * of booleans. These arrays can be indexed by either integers or by enumeration constants. */ class BooleanArray { /** * Return the value of the element at the given index. * * @param array the array being accessed * @param index the index of the element being accessed * @return the value of the element at the given index * @throws IndexOutOfBoundsException if the index is not between zero (0) and 31, inclusive */ static bool get(int array, int index) { _checkIndex(index); return (array & (1 << index)) > 0; } /** * Return the value of the element at the given index. * * @param array the array being accessed * @param index the index of the element being accessed * @return the value of the element at the given index * @throws IndexOutOfBoundsException if the index is not between zero (0) and 31, inclusive */ static bool getEnum(int array, Enum index) => get(array, index.ordinal); /** * Set the value of the element at the given index to the given value. * * @param array the array being modified * @param index the index of the element being set * @param value the value to be assigned to the element * @return the updated value of the array * @throws IndexOutOfBoundsException if the index is not between zero (0) and 31, inclusive */ static int set(int array, int index, bool value) { _checkIndex(index); if (value) { return array | (1 << index); } else { return array & ~(1 << index); } } /** * Set the value of the element at the given index to the given value. * * @param array the array being modified * @param index the index of the element being set * @param value the value to be assigned to the element * @return the updated value of the array * @throws IndexOutOfBoundsException if the index is not between zero (0) and 31, inclusive */ static int setEnum(int array, Enum index, bool value) => set(array, index.ordinal, value); /** * Throw an exception if the index is not within the bounds allowed for an integer-encoded array * of boolean values. * * @throws IndexOutOfBoundsException if the index is not between zero (0) and 31, inclusive */ static void _checkIndex(int index) { if (index < 0 || index > 30) { throw new RangeError("Index not between 0 and 30: $index"); } } } /** * Instances of the class `DirectedGraph` implement a directed graph in which the nodes are * arbitrary (client provided) objects and edges are represented implicitly. The graph will allow an * edge from any node to any other node, including itself, but will not represent multiple edges * between the same pair of nodes. * * @param N the type of the nodes in the graph */ class DirectedGraph<N> { /** * The table encoding the edges in the graph. An edge is represented by an entry mapping the head * to a set of tails. Nodes that are not the head of any edge are represented by an entry mapping * the node to an empty set of tails. */ HashMap<N, HashSet<N>> _edges = new HashMap<N, HashSet<N>>(); /** * Return `true` if this graph is empty. * * @return `true` if this graph is empty */ bool get isEmpty => _edges.isEmpty; /** * Return the number of nodes in this graph. * * @return the number of nodes in this graph */ int get nodeCount => _edges.length; /** * Return a set of all nodes in the graph. */ Set<N> get nodes => _edges.keys.toSet(); /** * Add an edge from the given head node to the given tail node. Both nodes will be a part of the * graph after this method is invoked, whether or not they were before. * * @param head the node at the head of the edge * @param tail the node at the tail of the edge */ void addEdge(N head, N tail) { // // First, ensure that the tail is a node known to the graph. // if (_edges[tail] == null) { _edges[tail] = new HashSet<N>(); } // // Then create the edge. // HashSet<N> tails = _edges[head]; if (tails == null) { tails = new HashSet<N>(); _edges[head] = tails; } tails.add(tail); } /** * Add the given node to the set of nodes in the graph. * * @param node the node to be added */ void addNode(N node) { HashSet<N> tails = _edges[node]; if (tails == null) { _edges[node] = new HashSet<N>(); } } /** * Run a topological sort of the graph. Since the graph may contain cycles, this results in a list * of strongly connected components rather than a list of nodes. The nodes in each strongly * connected components only have edges that point to nodes in the same component or earlier * components. */ List<List<N>> computeTopologicalSort() { DirectedGraph_SccFinder<N> finder = new DirectedGraph_SccFinder<N>(this); return finder.computeTopologicalSort(); } /** * Return true if the graph contains at least one path from `source` to `destination`. */ bool containsPath(N source, N destination) { HashSet<N> nodesVisited = new HashSet<N>(); return _containsPathInternal(source, destination, nodesVisited); } /** * Return a list of nodes that form a cycle containing the given node. If the node is not part of * this graph, then a list containing only the node itself will be returned. * * @return a list of nodes that form a cycle containing the given node */ List<N> findCycleContaining(N node) { if (node == null) { throw new IllegalArgumentException(); } DirectedGraph_SccFinder<N> finder = new DirectedGraph_SccFinder<N>(this); return finder.componentContaining(node); } /** * Return a set containing the tails of edges that have the given node as their head. The set will * be empty if there are no such edges or if the node is not part of the graph. Clients must not * modify the returned set. * * @param head the node at the head of all of the edges whose tails are to be returned * @return a set containing the tails of edges that have the given node as their head */ Set<N> getTails(N head) { HashSet<N> tails = _edges[head]; if (tails == null) { return new HashSet<N>(); } return tails; } /** * Remove all of the given nodes from this graph. As a consequence, any edges for which those * nodes were either a head or a tail will also be removed. * * @param nodes the nodes to be removed */ void removeAllNodes(List<N> nodes) { for (N node in nodes) { removeNode(node); } } /** * Remove the edge from the given head node to the given tail node. If there was no such edge then * the graph will be unmodified: the number of edges will be the same and the set of nodes will be * the same (neither node will either be added or removed). * * @param head the node at the head of the edge * @param tail the node at the tail of the edge * @return `true` if the graph was modified as a result of this operation */ void removeEdge(N head, N tail) { HashSet<N> tails = _edges[head]; if (tails != null) { tails.remove(tail); } } /** * Remove the given node from this graph. As a consequence, any edges for which that node was * either a head or a tail will also be removed. * * @param node the node to be removed */ void removeNode(N node) { _edges.remove(node); for (HashSet<N> tails in _edges.values) { tails.remove(node); } } /** * Find one node (referred to as a sink node) that has no outgoing edges (that is, for which there * are no edges that have that node as the head of the edge) and remove it from this graph. Return * the node that was removed, or `null` if there are no such nodes either because the graph * is empty or because every node in the graph has at least one outgoing edge. As a consequence of * removing the node from the graph any edges for which that node was a tail will also be removed. * * @return the sink node that was removed */ N removeSink() { N sink = _findSink(); if (sink == null) { return null; } removeNode(sink); return sink; } bool _containsPathInternal(N source, N destination, HashSet<N> nodesVisited) { if (identical(source, destination)) { return true; } HashSet<N> tails = _edges[source]; if (tails != null) { nodesVisited.add(source); for (N tail in tails) { if (!nodesVisited.contains(tail)) { if (_containsPathInternal(tail, destination, nodesVisited)) { return true; } } } } return false; } /** * Return one node that has no outgoing edges (that is, for which there are no edges that have * that node as the head of the edge), or `null` if there are no such nodes. * * @return a sink node */ N _findSink() { for (N key in _edges.keys) { if (_edges[key].isEmpty) return key; } return null; } } /** * Instances of the class `NodeInfo` are used by the [SccFinder] to maintain * information about the nodes that have been examined. * * @param N the type of the nodes corresponding to the entries */ class DirectedGraph_NodeInfo<N> { /** * The depth of this node. */ int index = 0; /** * The depth of the first node in a cycle. */ int lowlink = 0; /** * A flag indicating whether the corresponding node is on the stack. Used to remove the need for * searching a collection for the node each time the question needs to be asked. */ bool onStack = false; /** * The component that contains the corresponding node. */ List<N> component; /** * Initialize a newly created information holder to represent a node at the given depth. * * @param depth the depth of the node being represented */ DirectedGraph_NodeInfo(int depth) { index = depth; lowlink = depth; onStack = false; } } /** * Instances of the class `SccFinder` implement Tarjan's Algorithm for finding the strongly * connected components in a graph. */ class DirectedGraph_SccFinder<N> { /** * The graph to work with. */ final DirectedGraph<N> _graph; /** * The index used to uniquely identify the depth of nodes. */ int _index = 0; /** * The stack of nodes that are being visited in order to identify components. */ List<N> _stack = new List<N>(); /** * A table mapping nodes to information about the nodes that is used by this algorithm. */ HashMap<N, DirectedGraph_NodeInfo<N>> _nodeMap = new HashMap<N, DirectedGraph_NodeInfo<N>>(); /** * A list of all strongly connected components found, in topological sort order (each node in a * strongly connected component only has edges that point to nodes in the same component or * earlier components). */ List<List<N>> _allComponents = new List<List<N>>(); /** * Initialize a newly created finder. */ DirectedGraph_SccFinder(this._graph) : super(); /** * Return a list containing the nodes that are part of the strongly connected component that * contains the given node. * * @param node the node used to identify the strongly connected component to be returned * @return the nodes that are part of the strongly connected component that contains the given * node */ List<N> componentContaining(N node) => _strongConnect(node).component; /** * Run Tarjan's algorithm and return the resulting list of strongly connected components. The * list is in topological sort order (each node in a strongly connected component only has edges * that point to nodes in the same component or earlier components). */ List<List<N>> computeTopologicalSort() { for (N node in _graph._edges.keys.toSet()) { DirectedGraph_NodeInfo<N> nodeInfo = _nodeMap[node]; if (nodeInfo == null) { _strongConnect(node); } } return _allComponents; } /** * Remove and return the top-most element from the stack. * * @return the element that was removed */ N _pop() { N node = _stack.removeAt(_stack.length - 1); _nodeMap[node].onStack = false; return node; } /** * Add the given node to the stack. * * @param node the node to be added to the stack */ void _push(N node) { _nodeMap[node].onStack = true; _stack.add(node); } /** * Compute the strongly connected component that contains the given node as well as any * components containing nodes that are reachable from the given component. * * @param v the node from which the search will begin * @return the information about the given node */ DirectedGraph_NodeInfo<N> _strongConnect(N v) { // // Set the depth index for v to the smallest unused index // DirectedGraph_NodeInfo<N> vInfo = new DirectedGraph_NodeInfo<N>(_index++); _nodeMap[v] = vInfo; _push(v); // // Consider successors of v // HashSet<N> tails = _graph._edges[v]; if (tails != null) { for (N w in tails) { DirectedGraph_NodeInfo<N> wInfo = _nodeMap[w]; if (wInfo == null) { // Successor w has not yet been visited; recurse on it wInfo = _strongConnect(w); vInfo.lowlink = math.min(vInfo.lowlink, wInfo.lowlink); } else if (wInfo.onStack) { // Successor w is in stack S and hence in the current SCC vInfo.lowlink = math.min(vInfo.lowlink, wInfo.index); } } } // // If v is a root node, pop the stack and generate an SCC // if (vInfo.lowlink == vInfo.index) { List<N> component = new List<N>(); N w; do { w = _pop(); component.add(w); _nodeMap[w].component = component; } while (!identical(w, v)); _allComponents.add(component); } return vInfo; } } /** * The class `ListUtilities` defines utility methods useful for working with [List ]. */ class ListUtilities { /** * Add all of the elements in the given array to the given list. * * @param list the list to which the elements are to be added * @param elements the elements to be added to the list */ static void addAll(List list, List<Object> elements) { int count = elements.length; for (int i = 0; i < count; i++) { list.add(elements[i]); } } } /** * The interface `MapIterator` defines the behavior of objects that iterate over the entries * in a map. * * This interface defines the concept of a current entry and provides methods to access the key and * value in the current entry. When an iterator is first created it will be positioned before the * first entry and there is no current entry until [moveNext] is invoked. When all of the * entries have been accessed there will also be no current entry. * * There is no guarantee made about the order in which the entries are accessible. */ abstract class MapIterator<K, V> { /** * Return the key associated with the current element. * * @return the key associated with the current element * @throws NoSuchElementException if there is no current element */ K get key; /** * Return the value associated with the current element. * * @return the value associated with the current element * @throws NoSuchElementException if there is no current element */ V get value; /** * Set the value associated with the current element to the given value. * * @param newValue the new value to be associated with the current element * @throws NoSuchElementException if there is no current element */ void set value(V newValue); /** * Advance to the next entry in the map. Return `true` if there is a current element that * can be accessed after this method returns. It is safe to invoke this method even if the * previous invocation returned `false`. * * @return `true` if there is a current element that can be accessed */ bool moveNext(); } /** * Instances of the class `MultipleMapIterator` implement an iterator that can be used to * sequentially access the entries in multiple maps. */ class MultipleMapIterator<K, V> implements MapIterator<K, V> { /** * The iterators used to access the entries. */ List<MapIterator<K, V>> _iterators; /** * The index of the iterator currently being used to access the entries. */ int _iteratorIndex = -1; /** * The current iterator, or `null` if there is no current iterator. */ MapIterator<K, V> _currentIterator; /** * Initialize a newly created iterator to return the entries from the given maps. * * @param maps the maps containing the entries to be iterated */ MultipleMapIterator(List<Map<K, V>> maps) { int count = maps.length; _iterators = new List<MapIterator>(count); for (int i = 0; i < count; i++) { _iterators[i] = new SingleMapIterator<K, V>(maps[i]); } } @override K get key { if (_currentIterator == null) { throw new NoSuchElementException(); } return _currentIterator.key; } @override V get value { if (_currentIterator == null) { throw new NoSuchElementException(); } return _currentIterator.value; } @override void set value(V newValue) { if (_currentIterator == null) { throw new NoSuchElementException(); } _currentIterator.value = newValue; } @override bool moveNext() { if (_iteratorIndex < 0) { if (_iterators.length == 0) { _currentIterator = null; return false; } if (_advanceToNextIterator()) { return true; } else { _currentIterator = null; return false; } } if (_currentIterator.moveNext()) { return true; } else if (_advanceToNextIterator()) { return true; } else { _currentIterator = null; return false; } } /** * Under the assumption that there are no more entries that can be returned using the current * iterator, advance to the next iterator that has entries. * * @return `true` if there is a current iterator that has entries */ bool _advanceToNextIterator() { _iteratorIndex++; while (_iteratorIndex < _iterators.length) { MapIterator<K, V> iterator = _iterators[_iteratorIndex]; if (iterator.moveNext()) { _currentIterator = iterator; return true; } _iteratorIndex++; } return false; } } /** * Instances of the class `SingleMapIterator` implement an iterator that can be used to access * the entries in a single map. */ class SingleMapIterator<K, V> implements MapIterator<K, V> { /** * The [Map] containing the entries to be iterated over. */ final Map<K, V> _map; /** * The iterator used to access the entries. */ Iterator<K> _keyIterator; /** * The current key, or `null` if there is no current key. */ K _currentKey; /** * The current value. */ V _currentValue; /** * Initialize a newly created iterator to return the entries from the given map. * * @param map the map containing the entries to be iterated over */ SingleMapIterator(this._map) { this._keyIterator = _map.keys.iterator; } @override K get key { if (_currentKey == null) { throw new NoSuchElementException(); } return _currentKey; } @override V get value { if (_currentKey == null) { throw new NoSuchElementException(); } return _currentValue; } @override void set value(V newValue) { if (_currentKey == null) { throw new NoSuchElementException(); } _currentValue = newValue; _map[_currentKey] = newValue; } @override bool moveNext() { if (_keyIterator.moveNext()) { _currentKey = _keyIterator.current; _currentValue = _map[_currentKey]; return true; } else { _currentKey = null; return false; } } /** * Returns a new [SingleMapIterator] instance for the given [Map]. */ static SingleMapIterator forMap(Map map) => new SingleMapIterator(map); } /** * Instances of the class `TokenMap` map one set of tokens to another set of tokens. */ class TokenMap { /** * A table mapping tokens to tokens. This should be replaced by a more performant implementation. * One possibility is a pair of parallel arrays, with keys being sorted by their offset and a * cursor indicating where to start searching. */ HashMap<Token, Token> _map = new HashMap<Token, Token>(); /** * Return the token that is mapped to the given token, or `null` if there is no token * corresponding to the given token. * * @param key the token being mapped to another token * @return the token that is mapped to the given token */ Token get(Token key) => _map[key]; /** * Map the key to the value. * * @param key the token being mapped to the value * @param value the token to which the key will be mapped */ void put(Token key, Token value) { _map[key] = value; } }