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package yamlesque
import spray.json._
trait JsonYamlFormats {
implicit def jsonToYamlReader[A](implicit jsReader: JsonReader[A]): YamlReader[A] = new YamlReader[A] {
override def read(yaml: YamlValue): A = jsReader.read(JsonFormats.yamlToJson(yaml))
}
implicit def jsonToYamlWriter[A](implicit jsWriter: JsonWriter[A]): YamlWriter[A] = new YamlWriter[A] {
override def write(a: A): YamlValue = JsonFormats.jsonToYaml(jsWriter.write(a))
}
}
object JsonFormats {
def jsonToYaml(js: JsValue): YamlValue = js match {
case JsNull => YamlEmpty
case JsNumber(number) => YamlScalar(number.toString)
case JsBoolean(value) => YamlScalar(value.toString)
case JsString(value) => YamlScalar(value)
case JsArray(elements) => YamlSequence(elements.map(jsonToYaml _ ))
case JsObject(fields) => YamlMapping(fields.mapValues(jsonToYaml _ ))
}
val JsNumberPattern = """([-+]?[0-9]*\.?[0-9]+(?:[eE][-+]?[0-9]+)?)""".r
def yamlToJson(yaml: YamlValue): JsValue = yaml match {
case YamlEmpty => JsNull
case YamlScalar("true") => JsTrue
case YamlScalar("false") => JsFalse
case YamlScalar(JsNumberPattern(x)) => JsNumber(x.toDouble)
case YamlScalar(x) => JsString(x)
case YamlSequence(elements) => JsArray(elements.map(yamlToJson))
case YamlMapping(fields) => JsObject(fields.mapValues(yamlToJson))
}
}
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