spray.json.lenses.JsonLenses.scala Maven / Gradle / Ivy

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json-lenses

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package spray.json
package lenses

/**
 * An aggregate option to import all of the functionality of JsonLenses with one
 * import.
 */
object JsonLenses extends ScalarLenses with OptionLenses with SeqLenses with Operations with JsonPathIntegration with ExtraImplicits {

  class OptionalFieldBuilder(fieldName: String) {
    def `?`: OptLens = optionalField(fieldName)
  }

  implicit def strToField(name: String): ScalarLens = field(name)
  implicit def symbolToField(sym: Symbol): ScalarLens = field(sym.name)
  implicit def strToPossiblyOptionalField(name: String): OptionalFieldBuilder = new OptionalFieldBuilder(name)
  implicit def strToPossiblyOptionalField(sym: Symbol): OptionalFieldBuilder = new OptionalFieldBuilder(sym.name)

  /**
   * The lens which combines an outer lens with an inner.
   */
  def combine[M[_], M2[_], R[_]](outer: Lens[M], inner: Lens[M2])(implicit ev: Join[M2, M, R]): Lens[R] =
    new LensImpl[R]()(ev.get(inner.ops, outer.ops)) {
      def retr: JsValue ⇒ Validated[R[JsValue]] = parent ⇒
        for {
          outerV ← outer.retr(parent)
          innerV ← ops.allRight(outer.ops.flatMap(outerV)(x ⇒ inner.ops.toSeq(inner.retr(x))))
        } yield innerV

      def updated(f: SafeJsValue ⇒ SafeJsValue)(parent: JsValue): SafeJsValue =
        outer.updated(_.flatMap(inner.updated(f)))(parent)
    }
}