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/*
* Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization.json.internal
import kotlinx.serialization.*
import kotlinx.serialization.builtins.*
import kotlinx.serialization.descriptors.*
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import kotlin.native.concurrent.*
@ExperimentalSerializationApi
@OptIn(ExperimentalUnsignedTypes::class)
@SharedImmutable
private val unsignedNumberDescriptors = setOf(
UInt.serializer().descriptor,
ULong.serializer().descriptor,
UByte.serializer().descriptor,
UShort.serializer().descriptor
)
@ExperimentalSerializationApi
internal val SerialDescriptor.isUnsignedNumber: Boolean
get() = this.isInline && this in unsignedNumberDescriptors
@OptIn(ExperimentalSerializationApi::class, ExperimentalUnsignedTypes::class)
internal class StreamingJsonEncoder(
private val composer: Composer,
override val json: Json,
private val mode: WriteMode,
private val modeReuseCache: Array<JsonEncoder?>?
) : JsonEncoder, AbstractEncoder() {
internal constructor(
output: JsonStringBuilder, json: Json, mode: WriteMode,
modeReuseCache: Array<JsonEncoder?>
) : this(Composer(output, json), json, mode, modeReuseCache)
override val serializersModule: SerializersModule = json.serializersModule
private val configuration = json.configuration
// Forces serializer to wrap all values into quotes
private var forceQuoting: Boolean = false
private var polymorphicDiscriminator: String? = null
init {
val i = mode.ordinal
if (modeReuseCache != null) {
if (modeReuseCache[i] !== null || modeReuseCache[i] !== this)
modeReuseCache[i] = this
}
}
override fun encodeJsonElement(element: JsonElement) {
encodeSerializableValue(JsonElementSerializer, element)
}
override fun shouldEncodeElementDefault(descriptor: SerialDescriptor, index: Int): Boolean {
return configuration.encodeDefaults
}
override fun <T> encodeSerializableValue(serializer: SerializationStrategy<T>, value: T) {
encodePolymorphically(serializer, value) {
polymorphicDiscriminator = it
}
}
private fun encodeTypeInfo(descriptor: SerialDescriptor) {
composer.nextItem()
encodeString(polymorphicDiscriminator!!)
composer.print(COLON)
composer.space()
encodeString(descriptor.serialName)
}
override fun beginStructure(descriptor: SerialDescriptor): CompositeEncoder {
val newMode = json.switchMode(descriptor)
if (newMode.begin != INVALID) { // entry
composer.print(newMode.begin)
composer.indent()
}
if (polymorphicDiscriminator != null) {
encodeTypeInfo(descriptor)
polymorphicDiscriminator = null
}
if (mode == newMode) {
return this
}
return modeReuseCache?.get(newMode.ordinal) ?: StreamingJsonEncoder(composer, json, newMode, modeReuseCache)
}
override fun endStructure(descriptor: SerialDescriptor) {
if (mode.end != INVALID) {
composer.unIndent()
composer.nextItem()
composer.print(mode.end)
}
}
override fun encodeElement(descriptor: SerialDescriptor, index: Int): Boolean {
when (mode) {
WriteMode.LIST -> {
if (!composer.writingFirst)
composer.print(COMMA)
composer.nextItem()
}
WriteMode.MAP -> {
if (!composer.writingFirst) {
forceQuoting = if (index % 2 == 0) {
composer.print(COMMA)
composer.nextItem() // indent should only be put after commas in map
true
} else {
composer.print(COLON)
composer.space()
false
}
} else {
forceQuoting = true
composer.nextItem()
}
}
WriteMode.POLY_OBJ -> {
if (index == 0)
forceQuoting = true
if (index == 1) {
composer.print(COMMA)
composer.space()
forceQuoting = false
}
}
else -> {
if (!composer.writingFirst)
composer.print(COMMA)
composer.nextItem()
encodeString(descriptor.getElementName(index))
composer.print(COLON)
composer.space()
}
}
return true
}
override fun <T : Any> encodeNullableSerializableElement(
descriptor: SerialDescriptor,
index: Int,
serializer: SerializationStrategy<T>,
value: T?
) {
if (value != null || configuration.explicitNulls) {
super.encodeNullableSerializableElement(descriptor, index, serializer, value)
}
}
override fun encodeInline(inlineDescriptor: SerialDescriptor): Encoder =
if (inlineDescriptor.isUnsignedNumber) StreamingJsonEncoder(
ComposerForUnsignedNumbers(composer.sb), json, mode, null
)
else super.encodeInline(inlineDescriptor)
override fun encodeNull() {
composer.print(NULL)
}
override fun encodeBoolean(value: Boolean) {
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
}
override fun encodeByte(value: Byte) {
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
}
override fun encodeShort(value: Short) {
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
}
override fun encodeInt(value: Int) {
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
}
override fun encodeLong(value: Long) {
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
}
override fun encodeFloat(value: Float) {
// First encode value, then check, to have a prettier error message
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
if (!configuration.allowSpecialFloatingPointValues && !value.isFinite()) {
throw InvalidFloatingPointEncoded(value, composer.sb.toString())
}
}
override fun encodeDouble(value: Double) {
// First encode value, then check, to have a prettier error message
if (forceQuoting) encodeString(value.toString()) else composer.print(value)
if (!configuration.allowSpecialFloatingPointValues && !value.isFinite()) {
throw InvalidFloatingPointEncoded(value, composer.sb.toString())
}
}
override fun encodeChar(value: Char) {
encodeString(value.toString())
}
override fun encodeString(value: String) = composer.printQuoted(value)
override fun encodeEnum(enumDescriptor: SerialDescriptor, index: Int) {
encodeString(enumDescriptor.getElementName(index))
}
}
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