Add derived types codegen & value impl

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt

@@ -6,8 +6,7 @@
  *
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
-@file:Suppress("ClassName")
-
+@file:Suppress("ClassName", "unused")
 package net.mamoe.mirai.console.codegen
 
 import org.intellij.lang.annotations.Language
@@ -196,4 +195,45 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
     }
 
     appendln()
+
+    // FOR COMPLEX TYPES
+
+    appendln(
+        """
+            abstract class SettingValue<T : Setting> internal constructor() : Value<T>()
+
+            internal fun <T : Setting> Setting.valueImpl(default: T): Value<T> {
+                return object : SettingValue<T>() {
+                    private var internalValue: T = default
+                    override var value: T
+                        get() = internalValue
+                        set(new) {
+                            if (new != internalValue) {
+                                internalValue = new
+                                onElementChanged(this)
+                            }
+                        }
+                    override val serializer = object : KSerializer<T>{
+                        override val descriptor: SerialDescriptor
+                            get() = internalValue.updaterSerializer.descriptor
+
+                        override fun deserialize(decoder: Decoder): T {
+                            internalValue.updaterSerializer.deserialize(decoder)
+                            return internalValue
+                        }
+
+                        override fun serialize(encoder: Encoder, value: T) {
+                            internalValue.updaterSerializer.serialize(encoder, SettingSerializerMark)
+                        }
+
+                    }.bind(
+                        getter = { internalValue },
+                        setter = { internalValue = it }
+                    )
+                }
+            }
+        """
+    )
+
+    appendln()
 }

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Setting.kt

@@ -13,6 +13,9 @@ package net.mamoe.mirai.console.setting
 
 import kotlinx.serialization.*
 import net.mamoe.yamlkt.Yaml
+import net.mamoe.yamlkt.YamlConfiguration
+import net.mamoe.yamlkt.YamlConfiguration.ListSerialization.FLOW_SEQUENCE
+import net.mamoe.yamlkt.YamlConfiguration.MapSerialization.FLOW_MAP
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 import kotlin.reflect.full.findAnnotation
@@ -57,17 +60,44 @@ abstract class Setting {
     internal var valueList: MutableList<Pair<Value<*>, KProperty<*>>> = mutableListOf()
     private var built: Boolean = false
 
-    internal val serializer: KSerializer<SettingSerializerMark> by lazy {
+    internal val updaterSerializer: KSerializer<SettingSerializerMark> by lazy {
         built = true
-        SettingSerializer(this)
+        SettingUpdaterSerializer(this)
+    }
+
+    internal val kotlinSerializer: KSerializer<Setting> by lazy {
+        object : KSerializer<Setting> {
+            override val descriptor: SerialDescriptor
+                get() = this@Setting.updaterSerializer.descriptor
+
+            override fun deserialize(decoder: Decoder): Setting {
+                this@Setting.updaterSerializer.deserialize(decoder)
+                return this@Setting
+            }
+
+            override fun serialize(encoder: Encoder, value: Setting) {
+                this@Setting.updaterSerializer.serialize(encoder, SettingSerializerMark)
+            }
+        }
     }
 
     internal fun onElementChanged(value: Value<*>) {
         println("my value changed!")
     }
+
+    companion object {
+        private val yaml =
+            Yaml(configuration = YamlConfiguration(classSerialization = FLOW_MAP, listSerialization = FLOW_SEQUENCE))
+    }
+
+    override fun toString(): String = yaml.stringify(this.serializer, this)
 }
 
-internal class SettingSerializer(
+@Suppress("UNCHECKED_CAST")
+val <T : Setting> T.serializer: KSerializer<T>
+    get() = kotlinSerializer as KSerializer<T>
+
+internal class SettingUpdaterSerializer(
     private val instance: Setting
 ) : KSerializer<SettingSerializerMark> {
     override val descriptor: SerialDescriptor by lazy {
@@ -120,4 +150,9 @@ internal class SettingSerializer(
 
 internal object SettingSerializerMark
 
-internal val KProperty<*>.serialNameOrPropertyName: String get() = this.findAnnotation<SerialName>()?.value ?: this.name
+internal val KProperty<*>.serialNameOrPropertyName: String get() = this.findAnnotation<SerialName>()?.value ?: this.name
+
+
+fun <T : Setting> Setting.value(default: T): Value<T> = valueImpl(default)
+inline fun <T : Setting> Setting.value(default: T, crossinline initializer: T.() -> Unit): Value<T> =
+    value(default).also { it.value.apply(initializer) }

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/_Value.kt

@@ -9,12 +9,15 @@
 
 package net.mamoe.mirai.console.setting
 
+import kotlinx.serialization.Decoder
+import kotlinx.serialization.Encoder
 import kotlinx.serialization.KSerializer
+import kotlinx.serialization.SerialDescriptor
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
 /**
- * !!! These primitive types are auto-generated by backend/codegen/src/main/kotlin/net.mamoe.mirai.console.ValuesCodegen.kt 
+ * !!! These primitive types are auto-generated by backend/codegen/src/main/kotlin/net.mamoe.mirai.console.ValuesCodegen.kt
  * !!! for better performance
  * !!! DO NOT MODIFY THIS FILE MANUALLY
  */
@@ -89,6 +92,7 @@ abstract class TypedStringArrayValue internal constructor() : TypedPrimitiveArra
 sealed class ListValue<E> : Value<List<E>>(), Iterable<E>{
     override fun iterator() = this.value.iterator()
 }
+
 abstract class IntListValue internal constructor() : ListValue<Int>()
 abstract class ShortListValue internal constructor() : ListValue<Short>()
 abstract class ByteListValue internal constructor() : ListValue<Byte>()
@@ -99,3 +103,35 @@ abstract class BooleanListValue internal constructor() : ListValue<Boolean>()
 abstract class CharListValue internal constructor() : ListValue<Char>()
 abstract class StringListValue internal constructor() : ListValue<String>()
 
+abstract class SettingValue<T : Setting> internal constructor() : Value<T>()
+
+internal fun <T : Setting> Setting.valueImpl(default: T): Value<T> {
+    return object : SettingValue<T>() {
+        private var internalValue: T = default
+        override var value: T
+            get() = internalValue
+            set(new) {
+                if (new != internalValue) {
+                    internalValue = new
+                    onElementChanged(this)
+                }
+            }
+        override val serializer = object : KSerializer<T> {
+            override val descriptor: SerialDescriptor
+                get() = internalValue.updaterSerializer.descriptor
+
+            override fun deserialize(decoder: Decoder): T {
+                internalValue.updaterSerializer.deserialize(decoder)
+                return internalValue
+            }
+
+            override fun serialize(encoder: Encoder, value: T) {
+                internalValue.updaterSerializer.serialize(encoder, SettingSerializerMark)
+            }
+
+        }.bind(
+            getter = { internalValue },
+            setter = { internalValue = it }
+        )
+    }
+}