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/*
* Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
@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 input = when (element) {
is JsonObject -> JsonTreeInput(this, element)
is JsonArray -> JsonTreeListInput(this, element)
is JsonLiteral, JsonNull -> JsonPrimitiveInput(this, element as JsonPrimitive)
}
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(descriptor: SerialDescriptor, vararg typeParams: KSerializer<*>): CompositeDecoder {
val currentObject = currentObject()
return when (descriptor.kind) {
StructureKind.LIST, is PolymorphicKind -> JsonTreeListInput(json, cast(currentObject))
StructureKind.MAP -> json.selectMapMode(
descriptor,
{ JsonTreeMapInput(json, cast(currentObject)) },
{ JsonTreeListInput(json, cast(currentObject)) }
)
else -> JsonTreeInput(json, cast(currentObject))
}
}
override fun endStructure(descriptor: SerialDescriptor) {
// Nothing
}
protected open fun getValue(tag: String): JsonPrimitive {
val currentElement = currentElement(tag)
return currentElement as? JsonPrimitive ?: throw JsonDecodingException(
-1,
"Expected JsonPrimitive at $tag, found $currentElement"
)
}
protected abstract fun currentElement(tag: String): JsonElement
override fun decodeTaggedChar(tag: String): Char {
val o = getValue(tag)
return if (o.content.length == 1) o.content[0] else throw SerializationException("$o can't be represented as Char")
}
override fun decodeTaggedEnum(tag: String, enumDescription: SerialDescriptor): 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) {
init {
pushTag(PRIMITIVE_TAG)
}
override fun decodeElementIndex(descriptor: SerialDescriptor): Int = 0
override fun currentElement(tag: String): JsonElement {
require(tag === PRIMITIVE_TAG) { "This input can only handle primitives with '$PRIMITIVE_TAG' tag" }
return obj
}
}
private open class JsonTreeInput(json: Json, override val obj: JsonObject) : AbstractJsonTreeInput(json, obj) {
private var position = 0
override fun decodeElementIndex(descriptor: SerialDescriptor): Int {
while (position < descriptor.elementsCount) {
val name = descriptor.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(descriptor: SerialDescriptor) {
if (!configuration.strictMode || descriptor.kind is PolymorphicKind) return
// Validate keys
val names = descriptor.cachedSerialNames()
for (key in obj.keys) {
if (key !in names) throw jsonUnknownKeyException(-1, 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(descriptor: 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(descriptor: 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(descriptor: SerialDescriptor): Int {
while (currentIndex < size - 1) {
currentIndex++
return currentIndex
}
return CompositeDecoder.READ_DONE
}
}
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