strcase/snake.go
2018-07-03 20:36:59 +02:00

95 lines
3.0 KiB
Go

/*
* The MIT License (MIT)
*
* Copyright (c) 2015 Ian Coleman
* Copyright (c) 2018 Ma_124, <github.com/Ma124>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, Subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or Substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// Package strcase converts strings to snake_case or CamelCase
package strcase
import (
"strings"
)
// Converts a string to snake_case
func ToSnake(s string) string {
return ToDelimited(s, '_')
}
// Converts a string to SCREAMING_SNAKE_CASE
func ToScreamingSnake(s string) string {
return ToScreamingDelimited(s, '_', true)
}
// Converts a string to kebab-case
func ToKebab(s string) string {
return ToDelimited(s, '-')
}
// Converts a string to SCREAMING-KEBAB-CASE
func ToScreamingKebab(s string) string {
return ToScreamingDelimited(s, '-', true)
}
// Converts a string to delimited.snake.case (in this case `del = '.'`)
func ToDelimited(s string, del uint8) string {
return ToScreamingDelimited(s, del, false)
}
// Converts a string to SCREAMING.DELIMITED.SNAKE.CASE (in this case `del = '.'; screaming = true`) or delimited.snake.case (in this case `del = '.'; screaming = false`)
func ToScreamingDelimited(s string, del 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]
if (v >= 'A' && v <= 'Z' && next >= 'a' && next <= 'z') || (v >= 'a' && v <= 'z' && next >= 'A' && next <= 'Z') {
nextCaseIsChanged = true
}
}
if i > 0 && n[len(n)-1] != del && nextCaseIsChanged {
// add underscore if next letter case type is changed
if v >= 'A' && v <= 'Z' {
n += string(del) + string(v)
} else if v >= 'a' && v <= 'z' {
n += string(v) + string(del)
}
} else if v == ' ' || v == '_' || v == '-' {
// replace spaces/underscores with delimiters
n += string(del)
} else {
n = n + string(v)
}
}
if screaming {
n = strings.ToUpper(n)
} else {
n = strings.ToLower(n)
}
return n
}