/
Boolean.cs
385 lines (329 loc) · 11.8 KB
/
Boolean.cs
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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
/*============================================================
**
**
**
** Purpose: The boolean class serves as a wrapper for the primitive
** type boolean.
**
**
===========================================================*/
using System.Buffers.Binary;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
namespace System
{
[Serializable]
[TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public readonly struct Boolean : IComparable, IConvertible, IComparable<bool>, IEquatable<bool>
{
//
// Member Variables
//
private readonly bool m_value; // Do not rename (binary serialization)
// The true value.
//
internal const int True = 1;
// The false value.
//
internal const int False = 0;
//
// Internal Constants are real consts for performance.
//
// The internal string representation of true.
//
internal const string TrueLiteral = "True";
// The internal string representation of false.
//
internal const string FalseLiteral = "False";
//
// Public Constants
//
// The public string representation of true.
//
public static readonly string TrueString = TrueLiteral;
// The public string representation of false.
//
public static readonly string FalseString = FalseLiteral;
//
// Overridden Instance Methods
//
/*=================================GetHashCode==================================
**Args: None
**Returns: 1 or 0 depending on whether this instance represents true or false.
**Exceptions: None
**Overridden From: Value
==============================================================================*/
// Provides a hash code for this instance.
public override int GetHashCode()
{
return (m_value) ? True : False;
}
/*===================================ToString===================================
**Args: None
**Returns: "True" or "False" depending on the state of the boolean.
**Exceptions: None.
==============================================================================*/
// Converts the boolean value of this instance to a String.
public override string ToString()
{
if (false == m_value)
{
return FalseLiteral;
}
return TrueLiteral;
}
public string ToString(IFormatProvider? provider)
{
return ToString();
}
public bool TryFormat(Span<char> destination, out int charsWritten)
{
if (m_value)
{
if (destination.Length > 3)
{
ulong true_val = BitConverter.IsLittleEndian ? 0x65007500720054ul : 0x54007200750065ul; // "True"
MemoryMarshal.Write<ulong>(MemoryMarshal.AsBytes(destination), ref true_val);
charsWritten = 4;
return true;
}
}
else
{
if (destination.Length > 4)
{
ulong fals_val = BitConverter.IsLittleEndian ? 0x73006C00610046ul : 0x460061006C0073ul; // "Fals"
MemoryMarshal.Write<ulong>(MemoryMarshal.AsBytes(destination), ref fals_val);
destination[4] = 'e';
charsWritten = 5;
return true;
}
}
charsWritten = 0;
return false;
}
// Determines whether two Boolean objects are equal.
public override bool Equals([NotNullWhen(true)] object? obj)
{
// If it's not a boolean, we're definitely not equal
if (!(obj is bool))
{
return false;
}
return m_value == ((bool)obj).m_value;
}
[NonVersionable]
public bool Equals(bool obj)
{
return m_value == obj;
}
// Compares this object to another object, returning an integer that
// indicates the relationship. For booleans, false sorts before true.
// null is considered to be less than any instance.
// If object is not of type boolean, this method throws an ArgumentException.
//
// Returns a value less than zero if this object
//
public int CompareTo(object? obj)
{
if (obj == null)
{
return 1;
}
if (!(obj is bool))
{
throw new ArgumentException(SR.Arg_MustBeBoolean);
}
if (m_value == ((bool)obj).m_value)
{
return 0;
}
else if (m_value == false)
{
return -1;
}
return 1;
}
public int CompareTo(bool value)
{
if (m_value == value)
{
return 0;
}
else if (m_value == false)
{
return -1;
}
return 1;
}
//
// Static Methods
//
// Custom string compares for early application use by config switches, etc
//
internal static bool IsTrueStringIgnoreCase(ReadOnlySpan<char> value)
{
// "true" as a ulong, each char |'d with 0x0020 for case-insensitivity
ulong true_val = BitConverter.IsLittleEndian ? 0x65007500720074ul : 0x74007200750065ul;
return value.Length == 4 &&
(MemoryMarshal.Read<ulong>(MemoryMarshal.AsBytes(value)) | 0x0020002000200020) == true_val;
}
internal static bool IsFalseStringIgnoreCase(ReadOnlySpan<char> value)
{
// "fals" as a ulong, each char |'d with 0x0020 for case-insensitivity
ulong fals_val = BitConverter.IsLittleEndian ? 0x73006C00610066ul : 0x660061006C0073ul;
return value.Length == 5 &&
(((MemoryMarshal.Read<ulong>(MemoryMarshal.AsBytes(value)) | 0x0020002000200020) == fals_val) &
((value[4] | 0x20) == 'e'));
}
// Determines whether a String represents true or false.
//
public static bool Parse(string value)
{
ArgumentNullException.ThrowIfNull(value);
return Parse(value.AsSpan());
}
public static bool Parse(ReadOnlySpan<char> value) =>
TryParse(value, out bool result) ? result : throw new FormatException(SR.Format(SR.Format_BadBoolean, new string(value)));
// Determines whether a String represents true or false.
//
public static bool TryParse([NotNullWhen(true)] string? value, out bool result) =>
TryParse(value.AsSpan(), out result);
public static bool TryParse(ReadOnlySpan<char> value, out bool result)
{
// Boolean.{Try}Parse allows for optional whitespace/null values before and
// after the case-insensitive "true"/"false", but we don't expect those to
// be the common case. We check for "true"/"false" case-insensitive in the
// fast, inlined call path, and then only if neither match do we fall back
// to trimming and making a second post-trimming attempt at matching those
// same strings.
if (IsTrueStringIgnoreCase(value))
{
result = true;
return true;
}
if (IsFalseStringIgnoreCase(value))
{
result = false;
return true;
}
return TryParseUncommon(value, out result);
static bool TryParseUncommon(ReadOnlySpan<char> value, out bool result)
{
// With "true" being 4 characters, even if we trim something from <= 4 chars,
// it can't possibly match "true" or "false".
int originalLength = value.Length;
if (originalLength >= 5)
{
value = TrimWhiteSpaceAndNull(value);
if (value.Length != originalLength)
{
// Something was trimmed. Try matching again.
if (IsTrueStringIgnoreCase(value))
{
result = true;
return true;
}
result = false;
return IsFalseStringIgnoreCase(value);
}
}
result = false;
return false;
}
}
private static ReadOnlySpan<char> TrimWhiteSpaceAndNull(ReadOnlySpan<char> value)
{
int start = 0;
while (start < value.Length)
{
if (!char.IsWhiteSpace(value[start]) && value[start] != '\0')
{
break;
}
start++;
}
int end = value.Length - 1;
while (end >= start)
{
if (!char.IsWhiteSpace(value[end]) && value[end] != '\0')
{
break;
}
end--;
}
return value.Slice(start, end - start + 1);
}
//
// IConvertible implementation
//
public TypeCode GetTypeCode()
{
return TypeCode.Boolean;
}
bool IConvertible.ToBoolean(IFormatProvider? provider)
{
return m_value;
}
char IConvertible.ToChar(IFormatProvider? provider)
{
throw new InvalidCastException(SR.Format(SR.InvalidCast_FromTo, "Boolean", "Char"));
}
sbyte IConvertible.ToSByte(IFormatProvider? provider)
{
return Convert.ToSByte(m_value);
}
byte IConvertible.ToByte(IFormatProvider? provider)
{
return Convert.ToByte(m_value);
}
short IConvertible.ToInt16(IFormatProvider? provider)
{
return Convert.ToInt16(m_value);
}
ushort IConvertible.ToUInt16(IFormatProvider? provider)
{
return Convert.ToUInt16(m_value);
}
int IConvertible.ToInt32(IFormatProvider? provider)
{
return Convert.ToInt32(m_value);
}
uint IConvertible.ToUInt32(IFormatProvider? provider)
{
return Convert.ToUInt32(m_value);
}
long IConvertible.ToInt64(IFormatProvider? provider)
{
return Convert.ToInt64(m_value);
}
ulong IConvertible.ToUInt64(IFormatProvider? provider)
{
return Convert.ToUInt64(m_value);
}
float IConvertible.ToSingle(IFormatProvider? provider)
{
return Convert.ToSingle(m_value);
}
double IConvertible.ToDouble(IFormatProvider? provider)
{
return Convert.ToDouble(m_value);
}
decimal IConvertible.ToDecimal(IFormatProvider? provider)
{
return Convert.ToDecimal(m_value);
}
DateTime IConvertible.ToDateTime(IFormatProvider? provider)
{
throw new InvalidCastException(SR.Format(SR.InvalidCast_FromTo, "Boolean", "DateTime"));
}
object IConvertible.ToType(Type type, IFormatProvider? provider)
{
return Convert.DefaultToType((IConvertible)this, type, provider);
}
}
}