86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package txt
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import (
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"strings"
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"unicode"
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)
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// isSeparator reports whether the rune could mark a word boundary.
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func isSeparator(r rune) bool {
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// ASCII alphanumerics and underscore are not separators
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if r <= 0x7F {
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switch {
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case '0' <= r && r <= '9':
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return false
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case 'a' <= r && r <= 'z':
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return false
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case 'A' <= r && r <= 'Z':
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return false
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case r == '_', r == '\'':
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return false
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}
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return true
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}
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// Letters and digits are not separators
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if unicode.IsLetter(r) || unicode.IsDigit(r) {
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return false
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}
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// Otherwise, all we can do for now is treat spaces as separators.
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return unicode.IsSpace(r)
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}
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// UcFirst returns the string with the first character converted to uppercase.
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func UcFirst(str string) string {
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for i, v := range str {
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return string(unicode.ToUpper(v)) + str[i+1:]
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}
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return ""
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}
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// Title returns the string with the first characters of each word converted to uppercase.
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func Title(s string) string {
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s = strings.ReplaceAll(s, "_", " ")
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s = strings.Trim(s, "/ -")
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if s == "" {
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return ""
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}
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blocks := strings.Split(s, "/")
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result := make([]string, 0, len(blocks))
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for _, block := range blocks {
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words := strings.Fields(block)
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if len(words) == 0 {
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continue
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}
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for i, w := range words {
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search := strings.ToLower(strings.Trim(w, ":.,;!?"))
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if match, ok := SpecialWords[search]; ok {
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words[i] = strings.Replace(strings.ToLower(w), search, match, 1)
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} else if i > 0 && SmallWords[search] {
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words[i] = strings.ToLower(w)
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} else {
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prev := ' '
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words[i] = strings.Map(
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func(r rune) rune {
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if isSeparator(prev) {
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prev = r
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return unicode.ToTitle(r)
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}
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prev = r
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return r
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},
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w)
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}
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}
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result = append(result, strings.Join(words, " "))
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}
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return strings.Join(result, " / ")
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}
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