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@file:Suppress("LeakingThis")
package kotlinx.serialization.json.internal
import kotlinx.serialization.*
import kotlinx.serialization.internal.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import kotlin.jvm.*
internal fun <T> Json.readJson(element: JsonElement, deserializer: DeserializationStrategy<T>): T {
val descriptor = deserializer.descriptor
if (element is JsonNull) {
// TODO temporary workaround (?)
require(descriptor.isNullable) { "Read JsonNull and expected nullable descriptor, but has $descriptor" }
@Suppress("NULL_FOR_NONNULL_TYPE")
return null
}
val input = when (descriptor.kind) {
StructureKind.LIST -> JsonTreeListInput(this, cast(element))
StructureKind.MAP -> JsonTreeMapInput(this, cast(element))
is PrimitiveKind -> JsonPrimitiveInput(this, cast(element))
else -> JsonTreeInput(this, cast(element))
}
return input.decode(deserializer)
}
private sealed class AbstractJsonTreeInput(override val json: Json, open val obj: JsonElement)
: NamedValueDecoder(), JsonInput {
override val context: SerialModule
get() = json.context
@JvmField
protected val configuration = json.configuration
private fun currentObject() = currentTagOrNull?.let { currentElement(it) } ?: obj
override fun decodeJson(): JsonElement = currentObject()
@Suppress("DEPRECATION")
override val updateMode: UpdateMode
get() = configuration.updateMode
override fun <T> decodeSerializableValue(deserializer: DeserializationStrategy<T>): T {
return decodeSerializableValuePolymorphic(deserializer)
}
override fun composeName(parentName: String, childName: String): String = childName
override fun beginStructure(desc: SerialDescriptor, vararg typeParams: KSerializer<*>): CompositeDecoder {
val currentObject = currentObject()
return when (desc.kind) {
StructureKind.LIST -> JsonTreeListInput(json, cast(currentObject))
StructureKind.MAP -> JsonTreeMapInput(json, cast(currentObject))
else -> JsonTreeInput(json, cast(currentObject))
}
}
protected open fun getValue(tag: String): JsonPrimitive {
val currentElement = currentElement(tag)
return currentElement as? JsonPrimitive ?: throw JsonElementTypeMismatchException("$currentElement at $tag", "JsonPrimitive")
}
protected abstract fun currentElement(tag: String): JsonElement
override fun decodeTaggedChar(tag: String): Char {
val o = getValue(tag)
return if (o.content.length == 1) o.content[0] else throw SerializationException("$o can't be represented as Char")
}
override fun decodeTaggedEnum(tag: String, enumDescription: EnumDescriptor): Int =
enumDescription.getElementIndexOrThrow(getValue(tag).content)
override fun decodeTaggedNull(tag: String): Nothing? = null
override fun decodeTaggedNotNullMark(tag: String): Boolean = currentElement(tag) !== JsonNull
override fun decodeTaggedUnit(tag: String) {
return
}
override fun decodeTaggedBoolean(tag: String): Boolean = getValue(tag).boolean
override fun decodeTaggedByte(tag: String): Byte = getValue(tag).int.toByte()
override fun decodeTaggedShort(tag: String) = getValue(tag).int.toShort()
override fun decodeTaggedInt(tag: String) = getValue(tag).int
override fun decodeTaggedLong(tag: String) = getValue(tag).long
override fun decodeTaggedFloat(tag: String) = getValue(tag).float
override fun decodeTaggedDouble(tag: String) = getValue(tag).double
override fun decodeTaggedString(tag: String) = getValue(tag).content
}
private class JsonPrimitiveInput(json: Json, override val obj: JsonPrimitive) : AbstractJsonTreeInput(json, obj) {
companion object {
const val primitive = "primitive"
}
init {
pushTag(primitive)
}
override fun currentElement(tag: String): JsonElement {
require(tag == primitive)
return obj
}
}
private open class JsonTreeInput(json: Json, override val obj: JsonObject) : AbstractJsonTreeInput(json, obj) {
private var position = 0
override fun decodeElementIndex(desc: SerialDescriptor): Int {
while (position < desc.elementsCount) {
val name = desc.getTag(position++)
if (name in obj) {
return position - 1
}
}
return CompositeDecoder.READ_DONE
}
override fun currentElement(tag: String): JsonElement = obj.getValue(tag)
override fun endStructure(desc: SerialDescriptor) {
if (!configuration.strictMode || desc is PolymorphicClassDescriptor) return
// Validate keys
val names = HashSet<String>(desc.elementsCount)
for (i in 0 until desc.elementsCount) {
names += desc.getElementName(i)
}
for (key in obj.keys) {
if (key !in names) throw JsonUnknownKeyException("Encountered an unknown key '$key'")
}
}
}
private class JsonTreeMapInput(json: Json, override val obj: JsonObject) : JsonTreeInput(json, obj) {
private val keys = obj.keys.toList()
private val size: Int = keys.size * 2
private var position = -1
override fun elementName(desc: SerialDescriptor, index: Int): String {
val i = index / 2
return keys[i]
}
override fun decodeElementIndex(desc: SerialDescriptor): Int {
while (position < size - 1) {
position++
return position
}
return CompositeDecoder.READ_DONE
}
override fun currentElement(tag: String): JsonElement {
return if (position % 2 == 0) JsonLiteral(tag) else obj.getValue(tag)
}
override fun endStructure(desc: SerialDescriptor) {
// do nothing, maps do not have strict keys, so strict mode check is omitted
}
}
private class JsonTreeListInput(json: Json, override val obj: JsonArray) : AbstractJsonTreeInput(json, obj) {
private val size = obj.content.size
private var currentIndex = -1
override fun elementName(desc: SerialDescriptor, index: Int): String = (index).toString()
override fun currentElement(tag: String): JsonElement {
return obj[tag.toInt()]
}
override fun decodeElementIndex(desc: SerialDescriptor): Int {
while (currentIndex < size - 1) {
currentIndex++
return currentIndex
}
return CompositeDecoder.READ_DONE
}
}
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