1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections;
using System.Collections.Generic;
using Microsoft.Contracts;
namespace Microsoft.Scripting.Utils {
/// <summary>
/// Allows wrapping of proxy types (like COM RCWs) to expose their IEnumerable functionality
/// which is supported after casting to IEnumerable, even though Reflection will not indicate
/// IEnumerable as a supported interface
/// </summary>
public class EnumerableWrapper : IEnumerable {
private IEnumerable _wrappedObject;
public EnumerableWrapper(IEnumerable o) {
_wrappedObject = o;
}
public IEnumerator GetEnumerator() {
return _wrappedObject.GetEnumerator();
}
}
public static class CollectionUtils {
public static void AddRange<T>(ICollection<T> collection, IEnumerable<T> items) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(items, "items");
List<T> list = collection as List<T>;
if (list != null) {
list.AddRange(items);
} else {
foreach (T item in items) {
collection.Add(item);
}
}
}
public static IEnumerable<T> ToEnumerable<T>(IEnumerable enumerable) {
foreach (T item in enumerable) {
yield return item;
}
}
public static IEnumerator<TSuper> ToCovariant<T, TSuper>(IEnumerator<T> enumerator)
where T : TSuper {
ContractUtils.RequiresNotNull(enumerator, "enumerator");
while (enumerator.MoveNext()) {
yield return enumerator.Current;
}
}
public static IEnumerable<TSuper> ToCovariant<T, TSuper>(IEnumerable<T> enumerable)
where T : TSuper {
return new CovariantConvertor<T, TSuper>(enumerable);
}
private class CovariantConvertor<T, TSuper> : IEnumerable<TSuper> where T : TSuper {
private IEnumerable<T> _enumerable;
public CovariantConvertor(IEnumerable<T> enumerable) {
ContractUtils.RequiresNotNull(enumerable, "enumerable");
_enumerable = enumerable;
}
[Pure]
public IEnumerator<TSuper> GetEnumerator() {
return CollectionUtils.ToCovariant<T, TSuper>(_enumerable.GetEnumerator());
}
[Pure]
IEnumerator IEnumerable.GetEnumerator() {
return GetEnumerator();
}
}
public static List<T> MakeList<T>(T item) {
List<T> result = new List<T>();
result.Add(item);
return result;
}
public static int CountOf<T>(IList<T> list, T item) where T : IEquatable<T> {
if (list == null) return 0;
int result = 0;
for (int i = 0; i < list.Count; i++) {
if (list[i].Equals(item)) {
result++;
}
}
return result;
}
public static int Max(this IEnumerable<int> values) {
ContractUtils.RequiresNotNull(values, "values");
int result = Int32.MinValue;
foreach (var value in values) {
if (value > result) {
result = value;
}
}
return result;
}
public static bool TrueForAll<T>(IEnumerable<T> collection, Predicate<T> predicate) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(predicate, "predicate");
foreach (T item in collection) {
if (!predicate(item)) return false;
}
return true;
}
public static List<T> GetRange<T>(IList<T> list, int index, int count) {
ContractUtils.RequiresNotNull(list, "list");
ContractUtils.RequiresArrayRange(list, index, count, "index", "count");
List<T> result = new List<T>(count);
int stop = index + count;
for (int i = index; i < stop; i++) {
result.Add(list[i]);
}
return result;
}
public static void InsertRange<T>(IList<T> collection, int index, IEnumerable<T> items) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(items, "items");
ContractUtils.RequiresArrayInsertIndex(collection, index, "index");
List<T> list = collection as List<T>;
if (list != null) {
list.InsertRange(index, items);
} else {
int i = index;
foreach (T obj in items) {
collection.Insert(i++, obj);
}
}
}
public static void RemoveRange<T>(IList<T> collection, int index, int count) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresArrayRange(collection, index, count, "index", "count");
List<T> list = collection as List<T>;
if (list != null) {
list.RemoveRange(index, count);
} else {
for (int i = index + count - 1; i >= index; i--) {
collection.RemoveAt(i);
}
}
}
public static int FindIndex<T>(this IList<T> collection, Predicate<T> predicate) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(predicate, "predicate");
for (int i = 0; i < collection.Count; i++) {
if (predicate(collection[i])) {
return i;
}
}
return -1;
}
public static IList<T> ToSortedList<T>(this ICollection<T> collection, Comparison<T> comparison) {
ContractUtils.RequiresNotNull(collection, "collection");
ContractUtils.RequiresNotNull(comparison, "comparison");
var array = new T[collection.Count];
collection.CopyTo(array, 0);
Array.Sort(array, comparison);
return array;
}
}
}
|
