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case.go
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case.go
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package strx
import (
"regexp"
"strings"
)
var (
numberSequence = regexp.MustCompile(`([a-zA-Z])(\d+)([a-zA-Z]?)`)
numberReplacement = []byte(`$1 $2 $3`)
)
var uppercaseAcronym = map[string]bool{
"ID": true,
}
func addWordBoundariesToNumbers(s string) string {
b := []byte(s)
b = numberSequence.ReplaceAll(b, numberReplacement)
return string(b)
}
func toCamelInitCase(s string, initCase bool) string {
s = addWordBoundariesToNumbers(s)
s = strings.Trim(s, " ")
n := ""
capNext := initCase
for _, v := range s {
if v >= 'A' && v <= 'Z' {
n += string(v)
}
if v >= '0' && v <= '9' {
n += string(v)
}
if v >= 'a' && v <= 'z' {
if capNext {
n += strings.ToUpper(string(v))
} else {
n += string(v)
}
}
if v == '_' || v == ' ' || v == '-' || v == '.' {
capNext = true
} else {
capNext = false
}
}
return n
}
// ToCamelCase converts a string to CamelCase
func ToCamelCase(s string) string {
if uppercaseAcronym[s] {
s = strings.ToLower(s)
}
return toCamelInitCase(s, true)
}
// ToLowerCamel converts a string to lowerCamelCase
func ToLowerCamel(s string) string {
if s == "" {
return s
}
if uppercaseAcronym[s] {
s = strings.ToLower(s)
}
if r := rune(s[0]); r >= 'A' && r <= 'Z' {
s = strings.ToLower(string(r)) + s[1:]
}
return toCamelInitCase(s, false)
}
// ToSnakeCase converts a string to snake_case
func ToSnakeCase(s string) string {
return ToDelimited(s, '_')
}
func ToSnakeWithIgnore(s string, ignore uint8) string {
return ToScreamingDelimited(s, '_', ignore, false)
}
// ToScreamingSnake converts a string to SCREAMING_SNAKE_CASE
func ToScreamingSnake(s string) string {
return ToScreamingDelimited(s, '_', 0, true)
}
// ToKebab converts a string to kebab-case
func ToKebab(s string) string {
return ToDelimited(s, '-')
}
// ToScreamingKebab converts a string to SCREAMING-KEBAB-CASE
func ToScreamingKebab(s string) string {
return ToScreamingDelimited(s, '-', 0, true)
}
// ToDelimited converts a string to delimited.snake.case
// (in this case `delimiter = '.'`)
func ToDelimited(s string, delimiter uint8) string {
return ToScreamingDelimited(s, delimiter, 0, false)
}
// ToScreamingDelimited converts a string to SCREAMING.DELIMITED.SNAKE.CASE
// (in this case `delimiter = '.'; screaming = true`)
// or delimited.snake.case
// (in this case `delimiter = '.'; screaming = false`)
func ToScreamingDelimited(s string, delimiter, ignore uint8, screaming bool) string {
s = addWordBoundariesToNumbers(s)
s = strings.Trim(s, " ")
n := ""
for i, v := range s {
// treat acronyms as words, eg for JSONData -> JSON is a whole word
nextCaseIsChanged := false
if i+1 < len(s) {
next := s[i+1]
vIsCap := v >= 'A' && v <= 'Z'
vIsLow := v >= 'a' && v <= 'z'
nextIsCap := next >= 'A' && next <= 'Z'
nextIsLow := next >= 'a' && next <= 'z'
if (vIsCap && nextIsLow) || (vIsLow && nextIsCap) {
nextCaseIsChanged = true
}
if ignore > 0 && i-1 >= 0 && s[i-1] == ignore && nextCaseIsChanged {
nextCaseIsChanged = false
}
}
switch {
case i > 0 && n[len(n)-1] != delimiter && nextCaseIsChanged:
// add underscore if next letter case type is changed
if v >= 'A' && v <= 'Z' {
n += string(delimiter) + string(v)
} else if v >= 'a' && v <= 'z' {
n += string(v) + string(delimiter)
}
case v == ' ' || v == '_' || v == '-':
// replace spaces/underscores with delimiters
if uint8(v) == ignore {
n += string(v)
} else {
n += string(delimiter)
}
default:
n += string(v)
}
}
if screaming {
n = strings.ToUpper(n)
} else {
n = strings.ToLower(n)
}
return n
}