GoZeroPlus/tools/goctl/util/string.go

package util

import "strings"

// Title returns a string value with s[0] which has been convert into upper case that
// there are not empty input text
func Title(s string) string {
	if len(s) == 0 {
		return s
	}

	return strings.ToUpper(s[:1]) + s[1:]
}

// Untitle returns a string value with s[0] which has been convert into lower case that
// there are not empty input text
func Untitle(s string) string {
	if len(s) == 0 {
		return s
	}

	return strings.ToLower(s[:1]) + s[1:]
}

// Index returns the index where the item equal,it will return -1 if mismatched
func Index(slice []string, item string) int {
	for i := range slice {
		if slice[i] == item {
			return i
		}
	}

	return -1
}

// SafeString converts the input string into a safe naming style in golang
func SafeString(in string) string {
	if len(in) == 0 {
		return in
	}

	data := strings.Map(func(r rune) rune {
		if isSafeRune(r) {
			return r
		}
		return '_'
	}, in)

	headRune := rune(data[0])
	if isNumber(headRune) {
		return "_" + data
	}
	return data
}

func isSafeRune(r rune) bool {
	return isLetter(r) || isNumber(r) || r == '_'
}

func isLetter(r rune) bool {
	return 'A' <= r && r <= 'z'
}

func isNumber(r rune) bool {
	return '0' <= r && r <= '9'
}