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- // Copyright 2022 The Gitea Authors. All rights reserved.
- // Use of this source code is governed by a MIT-style
- // license that can be found in the LICENSE file.
-
- package util
-
- import "github.com/yuin/goldmark/util"
-
- func isSnakeCaseUpper(c byte) bool {
- return 'A' <= c && c <= 'Z'
- }
-
- func isSnakeCaseLowerOrNumber(c byte) bool {
- return 'a' <= c && c <= 'z' || '0' <= c && c <= '9'
- }
-
- // ToSnakeCase convert the input string to snake_case format.
- //
- // Some samples.
- // "FirstName" => "first_name"
- // "HTTPServer" => "http_server"
- // "NoHTTPS" => "no_https"
- // "GO_PATH" => "go_path"
- // "GO PATH" => "go_path" // space is converted to underscore.
- // "GO-PATH" => "go_path" // hyphen is converted to underscore.
- //
- func ToSnakeCase(input string) string {
- if len(input) == 0 {
- return ""
- }
-
- var res []byte
- if len(input) == 1 {
- c := input[0]
- if isSnakeCaseUpper(c) {
- res = []byte{c + 'a' - 'A'}
- } else if isSnakeCaseLowerOrNumber(c) {
- res = []byte{c}
- } else {
- res = []byte{'_'}
- }
- } else {
- res = make([]byte, 0, len(input)*4/3)
- pos := 0
- needSep := false
- for pos < len(input) {
- c := input[pos]
- if c >= 0x80 {
- res = append(res, c)
- pos++
- continue
- }
- isUpper := isSnakeCaseUpper(c)
- if isUpper || isSnakeCaseLowerOrNumber(c) {
- end := pos + 1
- if isUpper {
- // skip the following upper letters
- for end < len(input) && isSnakeCaseUpper(input[end]) {
- end++
- }
- if end-pos > 1 && end < len(input) && isSnakeCaseLowerOrNumber(input[end]) {
- end--
- }
- }
- // skip the following lower or number letters
- for end < len(input) && (isSnakeCaseLowerOrNumber(input[end]) || input[end] >= 0x80) {
- end++
- }
- if needSep {
- res = append(res, '_')
- }
- res = append(res, input[pos:end]...)
- pos = end
- needSep = true
- } else {
- res = append(res, '_')
- pos++
- needSep = false
- }
- }
- for i := 0; i < len(res); i++ {
- if isSnakeCaseUpper(res[i]) {
- res[i] += 'a' - 'A'
- }
- }
- }
- return util.BytesToReadOnlyString(res)
- }
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