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string.go
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string.go
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// Copyright 2022 Fraunhofer AISEC
//
// 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.
//
// $$\ $$\ $$\ $$\
// $$ | $$ |\__| $$ |
// $$$$$$$\ $$ | $$$$$$\ $$\ $$\ $$$$$$$ |$$\ $$$$$$\ $$$$$$\ $$$$$$\
// $$ _____|$$ |$$ __$$\ $$ | $$ |$$ __$$ |$$ |\_$$ _| $$ __$$\ $$ __$$\
// $$ / $$ |$$ / $$ |$$ | $$ |$$ / $$ |$$ | $$ | $$ / $$ |$$ | \__|
// $$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$ | $$ |$$\ $$ | $$ |$$ |
// \$$$$$$\ $$ |\$$$$$ |\$$$$$ |\$$$$$$ |$$ | \$$$ |\$$$$$ |$$ |
// \_______|\__| \______/ \______/ \_______|\__| \____/ \______/ \__|
//
// This file is part of Clouditor Community Edition.
package util
import "unicode"
// CamelCaseToSnakeCase converts a `camelCase` string to `snake_case`
func CamelCaseToSnakeCase(input string) string {
if input == "" {
return ""
}
snakeCase := make([]rune, 0, len(input))
runeArray := []rune(input)
for i := range runeArray {
if i > 0 && marksNewWord(i, runeArray) {
snakeCase = append(snakeCase, '_', unicode.ToLower(runeArray[i]))
} else {
snakeCase = append(snakeCase, unicode.ToLower(runeArray[i]))
}
}
return string(snakeCase)
}
// marksNewWord checks if the current character starts a new word excluding the first word
func marksNewWord(i int, input []rune) bool {
if i >= len(input) {
return false
}
// If previous or following rune/character is lowercase or a number then it is a new word
if i < len(input)-1 && unicode.IsUpper(input[i]) && unicode.IsLower(input[i+1]) {
return true
} else if i > 0 && unicode.IsLower(input[i-1]) && unicode.IsUpper(input[i]) {
return true
} else if i < len(input)-1 && unicode.IsDigit(input[i]) && unicode.IsLower(input[i+1]) {
return true
} else if i > 0 && unicode.IsUpper(input[i-1]) && unicode.IsDigit(input[i]) {
return true
}
return false
}