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/*
* Copyright 2018 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kotlinx.serialization.json.internal
import kotlinx.serialization.*
import kotlinx.serialization.internal.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import kotlin.collections.set
import kotlin.jvm.*
internal fun <T> Json.writeJson(value: T, serializer: SerializationStrategy<T>): JsonElement {
lateinit var result: JsonElement
val encoder = JsonTreeOutput(this) { result = it }
encoder.encode(serializer, value)
return result
}
private sealed class AbstractJsonTreeOutput(
final override val json: Json,
val nodeConsumer: (JsonElement) -> Unit
) : NamedValueEncoder(), JsonOutput {
final override val context: SerialModule
get() = json.context
@JvmField
protected val configuration = json.configuration
private var writePolymorphic = false
override fun encodeJson(element: JsonElement) {
encodeSerializableValue(JsonElementSerializer, element)
}
override fun shouldEncodeElementDefault(desc: SerialDescriptor, index: Int): Boolean = configuration.encodeDefaults
override fun composeName(parentName: String, childName: String): String = childName
abstract fun putElement(key: String, element: JsonElement)
abstract fun getCurrent(): JsonElement
override fun encodeTaggedNull(tag: String) = putElement(tag, JsonNull)
override fun encodeTaggedInt(tag: String, value: Int) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedByte(tag: String, value: Byte) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedShort(tag: String, value: Short) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedLong(tag: String, value: Long) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedFloat(tag: String, value: Float) {
if (configuration.strictMode && !value.isFinite()) {
throw JsonInvalidValueInStrictModeException(value)
}
putElement(tag, JsonLiteral(value))
}
override fun <T> encodeSerializableValue(serializer: SerializationStrategy<T>, value: T) {
encodePolymorphically(serializer, value) {
writePolymorphic = true
}
}
override fun encodeTaggedDouble(tag: String, value: Double) {
if (configuration.strictMode && !value.isFinite()) {
throw JsonInvalidValueInStrictModeException(value)
}
putElement(tag, JsonLiteral(value))
}
override fun encodeTaggedBoolean(tag: String, value: Boolean) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedChar(tag: String, value: Char) = putElement(tag, JsonLiteral(value.toString()))
override fun encodeTaggedString(tag: String, value: String) = putElement(tag, JsonLiteral(value))
override fun encodeTaggedEnum(
tag: String,
enumDescription: EnumDescriptor,
ordinal: Int
) = putElement(tag, JsonLiteral(enumDescription.getElementName(ordinal)))
override fun encodeTaggedValue(tag: String, value: Any) {
putElement(tag, JsonLiteral(value.toString()))
}
override fun beginStructure(desc: SerialDescriptor, vararg typeParams: KSerializer<*>): CompositeEncoder {
val consumer =
if (currentTagOrNull == null) nodeConsumer
else { node -> putElement(currentTag, node) }
val encoder = when (desc.kind) {
StructureKind.LIST, UnionKind.POLYMORPHIC -> JsonTreeListOutput(json, consumer)
StructureKind.MAP -> JsonTreeMapOutput(json, consumer)
else -> JsonTreeOutput(json, consumer)
}
if (writePolymorphic) {
writePolymorphic = false
encoder.putElement(configuration.classDiscriminator, JsonPrimitive(desc.name))
}
return encoder
}
override fun endEncode(desc: SerialDescriptor) {
nodeConsumer(getCurrent())
}
}
private open class JsonTreeOutput(json: Json, nodeConsumer: (JsonElement) -> Unit) :
AbstractJsonTreeOutput(json, nodeConsumer) {
protected val content: MutableMap<String, JsonElement> = linkedMapOf()
override fun putElement(key: String, element: JsonElement) {
content[key] = element
}
override fun getCurrent(): JsonElement = JsonObject(content)
}
private class JsonTreeMapOutput(json: Json, nodeConsumer: (JsonElement) -> Unit) : JsonTreeOutput(json, nodeConsumer) {
private lateinit var tag: String
override fun putElement(key: String, element: JsonElement) {
val idx = key.toInt()
if (idx % 2 == 0) { // writing key
check(element is JsonLiteral) { "Expected JsonLiteral, but has $element" }
tag = element.content
} else {
content[tag] = element
}
}
override fun getCurrent(): JsonElement {
return JsonObject(content)
}
override fun shouldWriteElement(desc: SerialDescriptor, tag: String, index: Int): Boolean = true
}
private class JsonTreeListOutput(json: Json, nodeConsumer: (JsonElement) -> Unit) :
AbstractJsonTreeOutput(json, nodeConsumer) {
private val array: ArrayList<JsonElement> = arrayListOf()
override fun shouldWriteElement(desc: SerialDescriptor, tag: String, index: Int): Boolean = true
override fun putElement(key: String, element: JsonElement) {
val idx = key.toInt()
array.add(idx, element)
}
override fun getCurrent(): JsonElement = JsonArray(array)
}
@Suppress("USELESS_CAST") // Contracts does not work in K/N
internal inline fun <reified T : JsonElement> cast(obj: JsonElement): T {
check(obj is T) { "Expected ${T::class} but found ${obj::class}" }
return obj as T
}
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