12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 |
- // Copyright 2021 The Gitea Authors. All rights reserved.
- // SPDX-License-Identifier: MIT
-
- package util
-
- import "unicode/utf8"
-
- // in UTF8 "…" is 3 bytes so doesn't really gain us anything...
- const (
- utf8Ellipsis = "…"
- asciiEllipsis = "..."
- )
-
- // 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 {
- return input, ""
- }
-
- if !utf8.ValidString(input) {
- if n-3 < 0 {
- return input, ""
- }
- return input[:n-3] + asciiEllipsis, asciiEllipsis + input[n-3:]
- }
-
- end := 0
- for end <= n-3 {
- _, size := utf8.DecodeRuneInString(input[end:])
- if end+size > n-3 {
- break
- }
- end += size
- }
-
- 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:]
- }
|