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JsonFilter.scala
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JsonFilter.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.{Arr, Json, JsonPath, Obj}
trait JsonFilter {
def apply(value: Json, path: JsonPath): Option[Json]
protected def filters: List[JsonFilter] = List(this)
def &&(that: JsonFilter): JsonFilter = {
val left = this.filters
val right = that.filters
JsonFilters(left ::: right)
}
}
object JsonFilter {
def apply(filter: JsonFilter, json: Json): Option[Json] = filter.filters.foldLeft[Option[Json]](Some(json)) {
(result, filter) => result.flatMap(json => internal(filter, json, JsonPath.empty))
}
private def internal(
filter: JsonFilter,
json: Json,
path: JsonPath
): Option[Json] = json match {
case Obj(map) =>
val mutated = map
.map { case (key, value) => internal(filter, value, path \ key).map(updated => key -> updated) }
.flatten
.toList
filter(Obj(mutated: _*), path)
case Arr(vector) =>
val mutated = vector.zipWithIndex.flatMap { case (value, index) => internal(filter, value, path \ s"[$index]") }
filter(Arr(mutated), path)
case _ => filter(json, path)
}
}