/
utf8mb4.go
84 lines (69 loc) · 2.48 KB
/
utf8mb4.go
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
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package encodings
import (
"strings"
"unicode"
"unicode/utf8"
)
// utf8mb4Encoder is the implementation of Utf8mb4. As Go's string encoding perfectly matches `utf8mb4`, all of the
// encoding and decoding functions are identity functions.
type utf8mb4Encoder struct{}
// Utf8mb4 represents the `utf8mb4` character set encoding.
var Utf8mb4 Encoder = utf8mb4Encoder{}
// Decode implements the Encoder interface.
func (utf8mb4Encoder) Decode(str []byte) ([]byte, bool) {
return str, true
}
// Encode implements the Encoder interface.
func (utf8mb4Encoder) Encode(str []byte) ([]byte, bool) {
return str, true
}
// EncodeReplaceUnknown implements the Encoder interface.
func (utf8mb4Encoder) EncodeReplaceUnknown(str []byte) []byte {
return str
}
// DecodeRune implements the Encoder interface.
func (utf8mb4Encoder) DecodeRune(r []byte) ([]byte, bool) {
return r, true
}
// EncodeRune implements the Encoder interface.
func (utf8mb4Encoder) EncodeRune(r []byte) ([]byte, bool) {
return r, true
}
// Uppercase implements the Encoder interface.
func (utf8mb4Encoder) Uppercase(str string) string {
return strings.ToUpper(str)
}
// Lowercase implements the Encoder interface.
func (utf8mb4Encoder) Lowercase(str string) string {
return strings.ToLower(str)
}
// UppercaseRune implements the Encoder interface.
func (utf8mb4Encoder) UppercaseRune(r rune) rune {
return unicode.ToUpper(r)
}
// LowercaseRune implements the Encoder interface.
func (utf8mb4Encoder) LowercaseRune(r rune) rune {
return unicode.ToLower(r)
}
// NextRune implements the Encoder interface.
func (utf8mb4Encoder) NextRune(str string) (rune, int) {
return utf8.DecodeRuneInString(str)
}
// IsReturnSafe implements the Encoder interface. Since the encoding and decoding functions return their input, they are
// not safe to freely modify, and must be copied to preserve the original slice.
func (utf8mb4Encoder) IsReturnSafe() bool {
return false
}