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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftShims
extension String: Hashable {
/// Hashes the essential components of this value by feeding them into the
/// given hasher.
///
/// - Parameter hasher: The hasher to use when combining the components
/// of this instance.
public func hash(into hasher: inout Hasher) {
if _fastPath(self._guts.isNFCFastUTF8) {
self._guts.withFastUTF8 {
hasher.combine(bytes: UnsafeRawBufferPointer($0))
}
hasher.combine(0xFF as UInt8) // terminator
} else {
_gutsSlice._normalizedHash(into: &hasher)
}
}
}
extension StringProtocol {
/// Hashes the essential components of this value by feeding them into the
/// given hasher.
///
/// - Parameter hasher: The hasher to use when combining the components
/// of this instance.
@_specialize(where Self == String)
@_specialize(where Self == Substring)
public func hash(into hasher: inout Hasher) {
_gutsSlice._normalizedHash(into: &hasher)
}
}
extension _StringGutsSlice {
@_effects(releasenone) @inline(never) // slow-path
internal func _normalizedHash(into hasher: inout Hasher) {
if self.isNFCFastUTF8 {
self.withFastUTF8 {
hasher.combine(bytes: UnsafeRawBufferPointer($0))
}
} else {
_withNFCCodeUnits {
hasher.combine($0)
}
}
hasher.combine(0xFF as UInt8) // terminator
}
}
|
