2021-07-24 22:59:27 -04:00
|
|
|
// Copyright 2021 The Gitea Authors. All rights reserved.
|
2022-11-27 13:20:29 -05:00
|
|
|
// SPDX-License-Identifier: MIT
|
2021-07-24 22:59:27 -04:00
|
|
|
|
|
|
|
package util
|
|
|
|
|
|
|
|
import "unicode/utf8"
|
|
|
|
|
2021-12-09 00:41:17 -05:00
|
|
|
// in UTF8 "…" is 3 bytes so doesn't really gain us anything...
|
2022-01-20 12:46:10 -05:00
|
|
|
const (
|
|
|
|
utf8Ellipsis = "…"
|
|
|
|
asciiEllipsis = "..."
|
|
|
|
)
|
2021-12-09 00:41:17 -05:00
|
|
|
|
2021-07-24 22:59:27 -04:00
|
|
|
// SplitStringAtByteN splits a string at byte n accounting for rune boundaries. (Combining characters are not accounted for.)
|
|
|
|
func SplitStringAtByteN(input string, n int) (left, right string) {
|
|
|
|
if len(input) <= n {
|
2021-12-09 00:41:17 -05:00
|
|
|
return input, ""
|
2021-07-24 22:59:27 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
if !utf8.ValidString(input) {
|
2021-12-09 00:41:17 -05:00
|
|
|
if n-3 < 0 {
|
|
|
|
return input, ""
|
|
|
|
}
|
|
|
|
return input[:n-3] + asciiEllipsis, asciiEllipsis + input[n-3:]
|
2021-07-24 22:59:27 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
end := 0
|
|
|
|
for end <= n-3 {
|
|
|
|
_, size := utf8.DecodeRuneInString(input[end:])
|
|
|
|
if end+size > n-3 {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
end += size
|
|
|
|
}
|
|
|
|
|
2021-12-09 00:41:17 -05:00
|
|
|
return input[:end] + utf8Ellipsis, utf8Ellipsis + input[end:]
|
|
|
|
}
|
|
|
|
|
|
|
|
// SplitStringAtRuneN splits a string at rune n accounting for rune boundaries. (Combining characters are not accounted for.)
|
|
|
|
func SplitStringAtRuneN(input string, n int) (left, right string) {
|
|
|
|
if !utf8.ValidString(input) {
|
|
|
|
if len(input) <= n || n-3 < 0 {
|
|
|
|
return input, ""
|
|
|
|
}
|
|
|
|
return input[:n-3] + asciiEllipsis, asciiEllipsis + input[n-3:]
|
|
|
|
}
|
|
|
|
|
|
|
|
if utf8.RuneCountInString(input) <= n {
|
|
|
|
return input, ""
|
|
|
|
}
|
|
|
|
|
|
|
|
count := 0
|
|
|
|
end := 0
|
|
|
|
for count < n-1 {
|
|
|
|
_, size := utf8.DecodeRuneInString(input[end:])
|
|
|
|
end += size
|
|
|
|
count++
|
|
|
|
}
|
|
|
|
|
|
|
|
return input[:end] + utf8Ellipsis, utf8Ellipsis + input[end:]
|
2021-07-24 22:59:27 -04:00
|
|
|
}
|