Transformer.scala

/*
 * 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
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package fabric.transform

import fabric.rw._
import fabric._
import fabric.define.DefType

class Transformer(val json: Json, val paths: List[JsonPath]) {
  def modify(modifier: Json => Json): Json = paths.foldLeft(json)((json, path) => json.modify(path)(modifier))

  def move(to: JsonPath = JsonPath.empty): Json = paths.foldLeft(json) {
    (json, path) =>
      val value = json(path)
      json.remove(path).modify(to)(_.merge(value))
  }

  def copy(to: JsonPath = JsonPath.empty): Json = paths.foldLeft(json) {
    (json, path) =>
      val value = json(path)
      json.modify(to)(_.merge(value))
  }
}

object Transformer {
  implicit val rw: RW[Transformer] = RW.from(
    r = t => obj("json" -> t.json, "paths" -> t.paths.json),
    w = j => new Transformer(j("json"), j("paths").as[List[JsonPath]]),
    d = DefType.Obj("json" -> DefType.Dynamic, "paths" -> DefType.Arr(JsonPath.rw.definition))
  )
}