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CamelToSnakeFilter.scala
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CamelToSnakeFilter.scala
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/*
* Copyright (c) 2021 Typelevel
*
* 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 fabric.filter
import fabric.{Json, JsonPath, Obj}
/**
* Converts camelCase to snake_case in obj keys
*/
object CamelToSnakeFilter extends JsonFilter {
override def apply(value: Json, path: JsonPath): Option[Json] = value match {
case Obj(map) => Some(Obj(map.map { case (key, value) => toSnake(key) -> value }))
case _ => Some(value)
}
private def toSnake(key: String): String = key.flatMap {
case c if c.isUpper => s"_${c.toLower}"
case c => c.toString
}
}