You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
1.4 KiB
83 lines
1.4 KiB
// +build !windows
|
|
// +build !js
|
|
// +build !appengine
|
|
|
|
package runewidth
|
|
|
|
import (
|
|
"os"
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
var reLoc = regexp.MustCompile(`^[a-z][a-z][a-z]?(?:_[A-Z][A-Z])?\.(.+)`)
|
|
|
|
var mblenTable = map[string]int{
|
|
"utf-8": 6,
|
|
"utf8": 6,
|
|
"jis": 8,
|
|
"eucjp": 3,
|
|
"euckr": 2,
|
|
"euccn": 2,
|
|
"sjis": 2,
|
|
"cp932": 2,
|
|
"cp51932": 2,
|
|
"cp936": 2,
|
|
"cp949": 2,
|
|
"cp950": 2,
|
|
"big5": 2,
|
|
"gbk": 2,
|
|
"gb2312": 2,
|
|
}
|
|
|
|
func isEastAsian(locale string) bool {
|
|
charset := strings.ToLower(locale)
|
|
r := reLoc.FindStringSubmatch(locale)
|
|
if len(r) == 2 {
|
|
charset = strings.ToLower(r[1])
|
|
}
|
|
|
|
if strings.HasSuffix(charset, "@cjk_narrow") {
|
|
return false
|
|
}
|
|
|
|
for pos, b := range []byte(charset) {
|
|
if b == '@' {
|
|
charset = charset[:pos]
|
|
break
|
|
}
|
|
}
|
|
max := 1
|
|
if m, ok := mblenTable[charset]; ok {
|
|
max = m
|
|
}
|
|
if max > 1 && (charset[0] != 'u' ||
|
|
strings.HasPrefix(locale, "ja") ||
|
|
strings.HasPrefix(locale, "ko") ||
|
|
strings.HasPrefix(locale, "zh")) {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// IsEastAsian return true if the current locale is CJK
|
|
func IsEastAsian() bool {
|
|
locale := os.Getenv("LC_ALL")
|
|
if locale == "" {
|
|
locale = os.Getenv("LC_CTYPE")
|
|
}
|
|
if locale == "" {
|
|
locale = os.Getenv("LANG")
|
|
}
|
|
|
|
// ignore C locale
|
|
if locale == "POSIX" || locale == "C" {
|
|
return false
|
|
}
|
|
if len(locale) > 1 && locale[0] == 'C' && (locale[1] == '.' || locale[1] == '-') {
|
|
return false
|
|
}
|
|
|
|
return isEastAsian(locale)
|
|
}
|