Revert "New implementation of {,Linked}Hash{Set,Map}."

tests/corelib/hash_map2_test.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.
-
-// Tests of hash map behavior, with focus in iteration and concurrent
-// modification errors.
-
-library hash_map2_test;
-import 'dart:collection';
-
-testMap(Map newMap(), Map newMapFrom(Map map)) {
-  Map gen(int from, int to) {
-    Map map = new LinkedHashMap();
-    for (int i = from; i < to; i++) map[i] = i;
-    return map;
-  }
-
-  bool odd(int n) => (n & 1) == 1;
-  bool even(int n) => (n & 1) == 0;
-  void addAll(Map toMap, Map fromMap) {
-    fromMap.forEach((k, v) { toMap[k] = v; });
-  }
-
-  {  // Test growing to largish capacity.
-    Map map = newMap();
-
-    for (int i = 0; i < 256; i++) {
-      map[i] = i;
-    }
-    addAll(map, gen(256, 512));
-    addAll(map, newMapFrom(gen(512, 1000)));
-    Expect.equals(1000, map.length);
-
-    // Remove half.
-    for (int i = 0; i < 1000; i += 2) map.remove(i);
-    Expect.equals(500, map.length);
-    Expect.isFalse(map.keys.any(even));
-    Expect.isTrue(map.keys.every(odd));
-
-    // Re-add all.
-    addAll(map, gen(0, 1000));
-    Expect.equals(1000, map.length);
-  }
-
-  {  // Test having many deleted elements.
-    Map map = newMap();
-    map[0] = 0;
-    for (int i = 0; i < 1000; i++) {
-      map[i + 1] = i + 1;
-      map.remove(i);
-      Expect.equals(1, map.length);
-    }
-  }
-
-  {  // Test having many elements with same hashCode
-    Map map = newMap();
-    for (int i = 0; i < 1000; i++) {
-      map[new BadHashCode()] = 0;
-    }
-    Expect.equals(1000, map.length);
-  }
-
-  {  // Check concurrent modification
-    Map map = newMap()..[0] = 0..[1] = 1;
-
-    {  // Test adding before a moveNext.
-      Iterator iter = map.keys.iterator;
-      iter.moveNext();
-      map[1] = 9;  // Updating existing key isn't a modification.
-      iter.moveNext();
-      map[2] = 2;
-      Expect.throws(iter.moveNext, (e) => e is Error);
-    }
-
-    {  // Test adding after last element.
-      Iterator iter = map.keys.iterator;
-      Expect.equals(3, map.length);
-      iter.moveNext();
-      iter.moveNext();
-      iter.moveNext();
-      map[3] = 3;
-      Expect.throws(iter.moveNext, (e) => e is Error);
-    }
-
-    {  // Test removing during iteration.
-      Iterator iter = map.keys.iterator;
-      iter.moveNext();
-      map.remove(1000);  // Not a modification if it's not there.
-      iter.moveNext();
-      int n = iter.current;
-      map.remove(n);
-      // Removing doesn't change current.
-      Expect.equals(n, iter.current);
-      Expect.throws(iter.moveNext, (e) => e is Error);
-    }
-
-    {  // Test removing after last element.
-      Iterator iter = map.keys.iterator;
-      Expect.equals(3, map.length);
-      iter.moveNext();
-      iter.moveNext();
-      iter.moveNext();
-      int n = iter.current;
-      map.remove(n);
-      // Removing doesn't change current.
-      Expect.equals(n, iter.current);
-      Expect.throws(iter.moveNext, (e) => e is Error);
-    }
-
-    {  // Test that updating value doesn't cause error.
-      Iterator iter = map.keys.iterator;
-      Expect.equals(2, map.length);
-      iter.moveNext();
-      int n = iter.current;
-      map[n] = n * 2;
-      iter.moveNext();
-      Expect.equals(map[iter.current], iter.current);
-    }
-
-    {  // Test that modification during putIfAbsent is error
-      Expect.throws(() => map.putIfAbsent(4, () {
-        map[5] = 5;
-        return 4;
-      }), (e) => e is Error);
-      Expect.isFalse(map.containsKey(4));
-      Expect.isTrue(map.containsKey(5));
-    }
-
-    {  // Check adding many existing keys isn't considered modification.
-      Map map2 = newMap();
-      for (var key in map.keys) {
-        map2[key] = map[key] + 1;
-      }
-      Iterator iter = map.keys.iterator;
-      addAll(map, map2);
-      // Shouldn't throw.
-      iter.moveNext();
-    }
-  }
-
-  {  // Check that updating existing elements is not a modification.
-     // This must be the case even if the underlying data structure is
-     // nearly full.
-     for (int i = 1; i < 128; i++) {
-        // Create maps of different sizes, some of which should be
-        // at a limit of the underlying data structure.
-        Map map = newMapFrom(gen(0, i));
-        Iterator iter = map.keys.iterator;
-        for (int j = 0; j < i; j++) {
-          map[j] = j + 1;
-        }
-        iter.moveNext();  // Should not throw.
-
-        for (int j = 1; j < i; j++) {
-          map.remove(j);
-        }
-        iter = map.keys.iterator;
-        map[0] = 2;
-        iter.moveNext();  // Should not throw.
-     }
-  }
-
-  {  // Check that null can be in the map.
-    Map map = newMap();
-    map[null] = 0;
-    Expect.equals(1, map.length);
-    Expect.isTrue(map.containsKey(null));
-    Expect.isNull(map.keys.first);
-    Expect.isNull(map.keys.last);
-    map[null] = 1;
-    Expect.equals(1, map.length);
-    Expect.isTrue(map.containsKey(null));
-    map.remove(null);
-    Expect.isTrue(map.isEmpty);
-    Expect.isFalse(map.containsKey(null));
-
-    // Created using map.from.
-    map = newMapFrom(new Map()..[null] = 0);
-    Expect.equals(1, map.length);
-    Expect.isTrue(map.containsKey(null));
-    Expect.isNull(map.keys.first);
-    Expect.isNull(map.keys.last);
-    map[null] = 1;
-    Expect.equals(1, map.length);
-    Expect.isTrue(map.containsKey(null));
-    map.remove(null);
-    Expect.isTrue(map.isEmpty);
-    Expect.isFalse(map.containsKey(null));
-
-    Map fromMap = new Map();
-    fromMap[1] = 0;
-    fromMap[2] = 0;
-    fromMap[3] = 0;
-    fromMap[null] = 0;
-    fromMap[4] = 0;
-    fromMap[5] = 0;
-    fromMap[6] = 0;
-    Expect.equals(7, fromMap.length);
-
-    // map that grows with null in it.
-    map = newMapFrom(fromMap);
-    Expect.equals(7, map.length);
-    for (int i = 7; i < 128; i++) {
-      map[i] = 0;
-    }
-    Expect.equals(128, map.length);
-    Expect.isTrue(map.containsKey(null));
-    map[null] = 1;
-    Expect.equals(128, map.length);
-    Expect.isTrue(map.containsKey(null));
-    map.remove(null);
-    Expect.equals(127, map.length);
-    Expect.isFalse(map.containsKey(null));
-  }
-}
-
-void main() {
-  testMap(() => new HashMap(), (m) => new HashMap.from(m));
-  testMap(() => new LinkedHashMap(), (m) => new LinkedHashMap.from(m));
-}
-
-
-class BadHashCode {
-  static int idCounter = 0;
-  final int id;
-  BadHashCode() : id = idCounter++;
-  int get hashCode => 42;
-  // operator == is identity.
-  // Can't make a bad compareTo that isn't invalid.
-  int compareTo(BadHashCode other) => id - other.id;
-}