-
Notifications
You must be signed in to change notification settings - Fork 0
/
charset_unix.go
59 lines (54 loc) · 1.71 KB
/
charset_unix.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
// +build !windows,!nacl,!plan9
// Copyright 2021 The CDK Authors
// Copyright 2016 The TCell Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use 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 charset
import (
"os"
"regexp"
)
var (
rxLocaleAtDot = regexp.MustCompile(`^.*\.(.+?)\@.*$`)
rxLocaleAt = regexp.MustCompile(`^(.+)@.*$`)
rxLocaleDot = regexp.MustCompile(`^.*\.(.+)$`)
)
func Get() string {
// Determine the character set. This can help us later.
// Per POSIX, we search for LC_ALL first, then LC_CTYPE, and
// finally LANG. First one set wins.
locale := ""
if locale = os.Getenv("LC_ALL"); locale == "" {
if locale = os.Getenv("LC_CTYPE"); locale == "" {
locale = os.Getenv("LANG")
}
}
if locale == "POSIX" || locale == "C" || locale == "US-ASCII" {
return "US-ASCII"
}
if rxLocaleAtDot.MatchString(locale) {
m := rxLocaleAtDot.FindAllStringSubmatch(locale, -1)
return m[0][1]
}
if rxLocaleAt.MatchString(locale) {
m := rxLocaleAt.FindAllStringSubmatch(locale, -1)
return m[0][1]
}
if rxLocaleDot.MatchString(locale) {
m := rxLocaleDot.FindAllStringSubmatch(locale, -1)
return m[0][1]
}
// Default assumption, and on Linux we can see LC_ALL
// without a character set, which we assume implies UTF-8.
return "UTF-8"
}