Simplify codegen launcher

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

@@ -89,10 +89,16 @@ abstract class Codegen {
     protected abstract fun StringBuilder.apply(ktType: KtType)
 }
 
-abstract class RegionCodegen(regionName: String? = null) : Codegen() {
+abstract class RegionCodegen(private val targetFile: String, regionName: String? = null) : Codegen() {
     val regionName: String by lazy {
         regionName ?: this::class.simpleName!!.substringBefore("Codegen")
     }
+
+    fun startIndependent() {
+        codegen(targetFile) {
+            this@RegionCodegen.invoke()
+        }
+    }
 }
 
 abstract class PrimitiveCodegen : Codegen() {

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

@@ -1,43 +0,0 @@
-/*
- * Copyright 2020 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/master/LICENSE
- */
-
-@file:Suppress("PRE_RELEASE_CLASS")
-
-package net.mamoe.mirai.console.codegen
-
-
-object ValueKtCodegen {
-    object SettingCodegen {
-        object PrimitiveValuesCodegen : RegionCodegen(), DefaultInvoke {
-            override val defaultInvokeArgs: List<KtType>
-                get() = KtPrimitives + KtString
-
-            override fun StringBuilder.apply(ktType: KtType) {
-                @Suppress("ClassName")
-                appendKCode(
-                    """
-                    /**
-                     * Represents a non-null [$ktType] value.
-                     */
-                    interface ${ktType}Value : PrimitiveValue<$ktType>
-                """
-                )
-            }
-        }
-
-    }
-
-    @JvmStatic
-    fun main(args: Array<String>) {
-        codegen("Value.kt") {
-            SettingCodegen.PrimitiveValuesCodegen()
-        }
-    }
-}
-

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

@@ -0,0 +1,135 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+@file:Suppress("PRE_RELEASE_CLASS", "ClassName")
+
+package net.mamoe.mirai.console.codegen
+
+object ValueSettingCodegen {
+    /**
+     * The interface
+     */
+    object PrimitiveValuesCodegen : RegionCodegen("Value.kt"), DefaultInvoke {
+        @JvmStatic
+        fun main(args: Array<String>) = super.startIndependent()
+
+        override val defaultInvokeArgs: List<KtType>
+            get() = KtPrimitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            @Suppress("ClassName")
+            appendKCode(
+                """
+                    /**
+                     * Represents a non-null [$ktType] value.
+                     */
+                    interface ${ktType}Value : PrimitiveValue<$ktType>
+                """
+            )
+        }
+    }
+
+    object BuiltInSerializerConstantsPrimitivesCodegen : RegionCodegen("_Setting.value.kt"), DefaultInvoke {
+        @JvmStatic
+        fun main(args: Array<String>) = super.startIndependent()
+
+        override val defaultInvokeArgs: List<KtType> = KtPrimitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            appendLine(
+                kCode(
+                    """
+                @JvmStatic
+                val ${ktType.standardName}SerializerDescriptor = ${ktType.standardName}.serializer().descriptor 
+            """
+                ).lines().joinToString("\n") { "    $it" }
+            )
+        }
+    }
+
+    object PrimitiveValuesImplCodegen : RegionCodegen("_PrimitiveValueDeclarations.kt"), DefaultInvoke {
+        @JvmStatic
+        fun main(args: Array<String>) = super.startIndependent()
+
+        override val defaultInvokeArgs: List<KtType>
+            get() = KtPrimitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            appendKCode(
+                """
+internal abstract class ${ktType.standardName}ValueImpl : ${ktType.standardName}Value, SerializerAwareValue<${ktType.standardName}>, KSerializer<Unit> {
+    constructor()
+    constructor(default: ${ktType.standardName}) {
+        _value = default
+    }
+
+    private var _value: ${ktType.standardName}? = null
+
+    final override var value: ${ktType.standardName}
+        get() = _value ?: error("${ktType.standardName}Value.value should be initialized before get.")
+        set(v) {
+            if (v != this._value) {
+                this._value = v
+                onChanged()
+            }
+        }
+
+    protected abstract fun onChanged()
+
+    final override val serializer: KSerializer<Unit> get() = this
+    final override val descriptor: SerialDescriptor get() = BuiltInSerializerConstants.${ktType.standardName}SerializerDescriptor
+    final override fun serialize(encoder: Encoder, value: Unit) = ${ktType.standardName}.serializer().serialize(encoder, this.value)
+    final override fun deserialize(decoder: Decoder) {
+        value = ${ktType.standardName}.serializer().deserialize(decoder)
+    }
+}
+                """
+            )
+        }
+
+    }
+
+    object Setting_value_PrimitivesImplCodegen : RegionCodegen("_Setting.value.kt"), DefaultInvoke {
+        @JvmStatic
+        fun main(args: Array<String>) = super.startIndependent()
+
+        override val defaultInvokeArgs: List<KtType>
+            get() = KtPrimitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            appendKCode(
+                """
+internal fun Setting.valueImpl(default: ${ktType.standardName}): SerializerAwareValue<${ktType.standardName}> {
+    return object : ${ktType.standardName}ValueImpl(default) {
+        override fun onChanged() = this@valueImpl.onValueChanged(this)
+    }
+}
+                """
+            )
+        }
+    }
+
+    object Setting_valueImplPrimitiveCodegen : RegionCodegen("_Setting.value.kt"), DefaultInvoke {
+        @JvmStatic
+        fun main(args: Array<String>) = super.startIndependent()
+
+        override val defaultInvokeArgs: List<KtType>
+            get() = KtPrimitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            appendKCode(
+                """
+                ${ktType.standardName}::class -> valueImpl(default as ${ktType.standardName})
+                """.trimIndent()
+            )
+        }
+    }
+
+
+}

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

@@ -1,37 +0,0 @@
-/*
- * Copyright 2020 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/master/LICENSE
- */
-
-@file:Suppress("ClassName")
-
-package net.mamoe.mirai.console.codegen
-
-object _Setting_value_ktCodegen {
-    object BuiltInSerializerConstantsPrimitivesCodegen : RegionCodegen("BuiltInSerializerConstants primitives"),
-        DefaultInvoke {
-        override val defaultInvokeArgs: List<KtType> = KtPrimitives + KtString
-
-        override fun StringBuilder.apply(ktType: KtType) {
-            appendLine(
-                kCode(
-                    """
-                @JvmStatic
-                val ${ktType.standardName}SerializerDescriptor = ${ktType.standardName}.serializer().descriptor 
-            """
-                ).lines().joinToString("\n") { "    $it" }
-            )
-        }
-    }
-
-    @JvmStatic
-    fun main(args: Array<String>) {
-        codegen("_Setting.value.kt") {
-            BuiltInSerializerConstantsPrimitivesCodegen()
-        }
-    }
-}