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package cc.spray.json
package lenses
trait ScalarLenses {
def field(name: String): ScalarProjection = new Proj[Id] {
def updated(f: SafeJsValue => SafeJsValue)(parent: JsValue): SafeJsValue =
for {
res <- f(getField(parent))
}
yield JsObject(fields = parent.asJsObject.fields + (name -> res))
def retr: JsValue => SafeJsValue = v =>
getField(v)
def getField(v: JsValue): SafeJsValue = asObj(v) flatMap {
o =>
o.fields.get(name).getOrError("Expected field '%s' in '%s'" format(name, v))
}
def asObj(v: JsValue): Validated[JsObject] = v match {
case o: JsObject =>
Right(o)
case e@_ =>
unexpected("Not a json object: " + e)
}
}
def element(idx: Int): ScalarProjection = new Proj[Id] {
def updated(f: SafeJsValue => SafeJsValue)(parent: JsValue): SafeJsValue = parent match {
case JsArray(elements) =>
if (idx < elements.size) {
val (headEls, element :: tail) = elements.splitAt(idx)
f(Right(element)) map (v => JsArray(headEls ::: v :: tail))
} else
unexpected("Too little elements in array: %s size: %d index: %d" format(parent, elements.size, idx))
case e@_ =>
unexpected("Not a json array: " + e)
}
def retr: JsValue => SafeJsValue = {
case a@JsArray(elements) =>
if (idx < elements.size)
Right(elements(idx))
else
outOfBounds("Too little elements in array: %s size: %d index: %d" format(a, elements.size, idx))
case e@_ => unexpected("Not a json array: " + e)
}
}
/**
* The identity projection which operates on the current element itself
*/
val value: ScalarProjection = new Proj[Id] {
def updated(f: SafeJsValue => SafeJsValue)(parent: JsValue): SafeJsValue =
f(Right(parent))
def retr: JsValue => SafeJsValue = x => Right(x)
}
}
object ScalarLenses extends ScalarLenses
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