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snake.go
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snake.go
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// Copyright 2018 John Deng (hi.devops.io@gmail.com).
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// copied from https://github.com/iancoleman/strcase
package str
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
}