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-rw-r--r--vendor/github.com/mattn/go-runewidth/runewidth_posix.go82
1 files changed, 82 insertions, 0 deletions
diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_posix.go b/vendor/github.com/mattn/go-runewidth/runewidth_posix.go
new file mode 100644
index 000000000..480ad7485
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_posix.go
@@ -0,0 +1,82 @@
+// +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)
+}