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package jawn
import scala.collection.mutable
/**
* Facade is a type class that describes how Jawn should construct
* JSON AST elements of type J.
*
* Facade[J] also uses FContext[J] instances, so implementors will
* usually want to define both.
*/
trait SimpleFacade[J] extends Facade[J] {
def jarray(vs: List[J]): J
def jobject(vs: Map[String, J]): J
def singleContext() = new FContext[J] {
var value: J = _
def add(s: CharSequence) { value = jstring(s) }
def add(v: J) { value = v }
def finish: J = value
def isObj: Boolean = false
}
def arrayContext() = new FContext[J] {
val vs = mutable.ListBuffer.empty[J]
def add(s: CharSequence) { vs += jstring(s) }
def add(v: J) { vs += v }
def finish: J = jarray(vs.toList)
def isObj: Boolean = false
}
def objectContext() = new FContext[J] {
var key: String = null
var vs = Map.empty[String, J]
def add(s: CharSequence): Unit =
if (key == null) { key = s.toString } else { vs = vs.updated(key, jstring(s)); key = null }
def add(v: J): Unit =
{ vs = vs.updated(key, v); key = null }
def finish = jobject(vs)
def isObj = true
}
}
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