diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt
new file mode 100644
index 000000000..f79214b89
--- /dev/null
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/Codegen.kt
@@ -0,0 +1,98 @@
+/*
+ * 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("FunctionName", "INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+
+package net.mamoe.mirai.console.codegen
+
+import org.intellij.lang.annotations.Language
+
+abstract class Replacer(private val name: String) : (String) -> String {
+    override fun toString(): String {
+        return name
+    }
+}
+
+fun Codegen.Replacer(block: (String) -> String): Replacer {
+    return object : Replacer(this@Replacer::class.simpleName ?: "<unnamed>") {
+        override fun invoke(p1: String): String = block(p1)
+    }
+}
+
+class CodegenScope : MutableList<Replacer> by mutableListOf() {
+    fun applyTo(fileContent: String): String {
+        return this.fold(fileContent) { acc, replacer -> replacer(acc) }
+    }
+
+    @CodegenDsl
+    operator fun Codegen.invoke(vararg ktTypes: KtType) {
+        if (ktTypes.isEmpty() && this is DefaultInvoke) {
+            invoke(defaultInvokeArgs)
+        }
+        invoke(ktTypes.toList())
+    }
+
+    @CodegenDsl
+    operator fun Codegen.invoke(ktTypes: Collection<KtType>) {
+        add(Replacer {
+            it + buildString {
+                ktTypes.forEach { applyTo(this, it) }
+            }
+        })
+    }
+
+    @RegionCodegenDsl
+    operator fun RegionCodegen.invoke(vararg ktTypes: KtType) = invoke(ktTypes.toList())
+
+    @RegionCodegenDsl
+    operator fun RegionCodegen.invoke(ktTypes: Collection<KtType>) {
+        add(Replacer {
+            it.replace(Regex("""//// region $regionName CODEGEN START ////([\s\S]*?)//// endregion $regionName CODEGEN END ////""")) {
+                val code = CodegenScope().apply { (this@invoke as Codegen).invoke(*ktTypes.toTypedArray()) }.applyTo("")
+                """
+                        |//// region $regionName CODEGEN START ////
+                        |
+                        |$code
+                        |
+                        |//// endregion $regionName CODEGEN END ////
+                    """.trimMargin()
+            }
+        })
+    }
+
+    @DslMarker
+    annotation class CodegenDsl
+}
+
+@DslMarker
+annotation class RegionCodegenDsl
+
+interface DefaultInvoke {
+    val defaultInvokeArgs: List<KtType>
+}
+
+abstract class Codegen {
+    fun applyTo(stringBuilder: StringBuilder, ktType: KtType) = this.run { stringBuilder.apply(ktType) }
+
+    protected abstract fun StringBuilder.apply(ktType: KtType)
+}
+
+abstract class RegionCodegen(regionName: String? = null) : Codegen() {
+    val regionName: String by lazy {
+        regionName ?: this::class.simpleName!!.substringBefore("Codegen")
+    }
+}
+
+abstract class PrimitiveCodegen : Codegen() {
+    protected abstract fun StringBuilder.apply(ktType: KtPrimitive)
+
+    fun StringBuilder.apply(ktType: List<KtPrimitive>) = ktType.forEach { apply(it) }
+}
+
+fun StringBuilder.appendKCode(@Language("kt") ktCode: String): StringBuilder = append(kCode(ktCode)).appendLine()
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
index fff3f18ae..885a7e898 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt
@@ -46,35 +46,37 @@ fun JClazz.getTemplate():String = """
 
 fun main(){
     println(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(FILE_SUPPRESS)
-        appendln()
-        appendln("/**\n" +
-                " * !!! This file is auto-generated by backend/codegen/src/kotlin/net.mamoe.mirai.console.codegen.JSettingCodegen.kt\n" +
-                " * !!! DO NOT MODIFY THIS FILE MANUALLY\n" +
-                " */\n" +
-                "\"\"\"")
-        appendln()
-        appendln()
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(FILE_SUPPRESS)
+        appendLine()
+        appendLine(
+            "/**\n" +
+                    " * !!! This file is auto-generated by backend/codegen/src/kotlin/net.mamoe.mirai.console.codegen.JSettingCodegen.kt\n" +
+                    " * !!! DO NOT MODIFY THIS FILE MANUALLY\n" +
+                    " */\n" +
+                    "\"\"\""
+        )
+        appendLine()
+        appendLine()
 
 
         //do simplest
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(it.getTemplate())
+            appendLine(it.getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(JListClazz(it).getTemplate())
+            appendLine(JListClazz(it).getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {
-            appendln(JArrayClazz(it).getTemplate())
+            appendLine(JArrayClazz(it).getTemplate())
         }
 
         (J_EXTRA + J_NUMBERS).forEach {key ->
             (J_EXTRA + J_NUMBERS).forEach { value ->
-                appendln(JMapClazz(key, value).getTemplate())
+                appendLine(JMapClazz(key, value).getTemplate())
             }
         }
     })
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingCodegen.kt
new file mode 100644
index 000000000..d6ac306e1
--- /dev/null
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingCodegen.kt
@@ -0,0 +1,40 @@
+/*
+ * 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
+ */
+
+package net.mamoe.mirai.console.codegen
+
+object SettingCodegen {
+    object PrimitiveValuesCodegen : RegionCodegen(), DefaultInvoke {
+        override val defaultInvokeArgs: List<KtType>
+            get() = KtType.Primitives + KtString
+
+        override fun StringBuilder.apply(ktType: KtType) {
+            @Suppress("ClassName")
+            appendKCode(
+                """
+                    /**
+                     * Represents a non-null [$ktType] value.
+                     */
+                    interface ${ktType}Value : PrimitiveValue<$ktType>
+                """
+            )
+        }
+    }
+
+}
+
+object ValueKtCodegen {
+    @JvmStatic
+    fun main(args: Array<String>) {
+        codegen("Value.kt") {
+            SettingCodegen.PrimitiveValuesCodegen()
+        }
+    }
+}
+
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
index 36af092a4..561bb40c9 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt
@@ -19,19 +19,19 @@ fun main() {
     File("backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/_Setting.kt").apply {
         createNewFile()
     }.writeText(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(FILE_SUPPRESS)
-        appendln()
-        appendln(PACKAGE)
-        appendln()
-        appendln(IMPORTS)
-        appendln()
-        appendln()
-        appendln(DO_NOT_MODIFY)
-        appendln()
-        appendln()
-        appendln(genAllValueUseSite())
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(FILE_SUPPRESS)
+        appendLine()
+        appendLine(PACKAGE)
+        appendLine()
+        appendLine(IMPORTS)
+        appendLine()
+        appendLine()
+        appendLine(DO_NOT_MODIFY)
+        appendLine()
+        appendLine()
+        appendLine(genAllValueUseSite())
     })
 }
 
@@ -56,7 +56,7 @@ import kotlin.internal.LowPriorityInOverloadResolution
 
 fun genAllValueUseSite(): String = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
     // PRIMITIVE
     for (number in NUMBERS + OTHER_PRIMITIVES) {
@@ -83,7 +83,7 @@ fun genAllValueUseSite(): String = buildString {
     // MUTABLE LIST / MUTABLE SET
     for (collectionName in listOf("List", "Set")) {
         for (number in NUMBERS + OTHER_PRIMITIVES) {
-            appendln()
+            appendLine()
             appendln(
                 """
                 @JvmName("valueMutable")
@@ -94,7 +94,7 @@ fun genAllValueUseSite(): String = buildString {
     }
 
     // SPECIAL
-    appendln()
+    appendLine()
     appendln(
         """
             fun <T : Setting> Setting.value(default: T): Value<T> {
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
index b4c0014a3..f9e94702f 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt
@@ -19,17 +19,17 @@ fun main() {
     File("backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_ValueImpl.kt").apply {
         createNewFile()
     }.writeText(buildString {
-        appendln(COPYRIGHT)
-        appendln()
-        appendln(PACKAGE)
-        appendln()
-        appendln(IMPORTS)
-        appendln()
-        appendln()
-        appendln(DO_NOT_MODIFY)
-        appendln()
-        appendln()
-        appendln(genAllValueImpl())
+        appendLine(COPYRIGHT)
+        appendLine()
+        appendLine(PACKAGE)
+        appendLine()
+        appendLine(IMPORTS)
+        appendLine()
+        appendLine()
+        appendLine(DO_NOT_MODIFY)
+        appendLine()
+        appendLine()
+        appendLine(genAllValueImpl())
     })
 }
 
@@ -52,19 +52,19 @@ import net.mamoe.mirai.console.setting.*
 
 fun genAllValueImpl(): String = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
 
     // PRIMITIVE
     for (number in NUMBERS + OTHER_PRIMITIVES) {
         appendln(genPrimitiveValueImpl(number, number, "$number.serializer()", false))
-        appendln()
+        appendLine()
     }
 
     // PRIMITIVE ARRAYS
     for (number in NUMBERS + OTHER_PRIMITIVES.filterNot { it == "String" }) {
         appendln(genPrimitiveValueImpl("${number}Array", "${number}Array", "${number}ArraySerializer()", true))
-        appendln()
+        appendLine()
     }
 
     // TYPED ARRAYS
@@ -77,7 +77,7 @@ fun genAllValueImpl(): String = buildString {
                 true
             )
         )
-        appendln()
+        appendLine()
     }
 
     // PRIMITIVE LISTS / SETS
@@ -92,11 +92,11 @@ fun genAllValueImpl(): String = buildString {
                     false
                 )
             )
-            appendln()
+            appendLine()
         }
     }
 
-    appendln()
+    appendLine()
 
     // MUTABLE LIST / MUTABLE SET
 
@@ -141,11 +141,11 @@ fun genAllValueImpl(): String = buildString {
                 }
         """
             )
-            appendln()
+            appendLine()
         }
     }
 
-    appendln()
+    appendLine()
 
 
     appendln(
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
index 018f7242e..4920d6754 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt
@@ -56,11 +56,11 @@ internal val OTHER_PRIMITIVES = listOf(
 
 fun genPublicApi() = buildString {
     fun appendln(@Language("kt") code: String) {
-        this.appendln(code.trimIndent())
+        this.appendLine(code.trimIndent())
     }
 
     appendln(COPYRIGHT.trim())
-    appendln()
+    appendLine()
     appendln(
         """
             package net.mamoe.mirai.console.setting
@@ -70,7 +70,7 @@ fun genPublicApi() = buildString {
             import kotlin.reflect.KProperty
         """
     )
-    appendln()
+    appendLine()
     appendln(
         """
             /**
@@ -80,7 +80,7 @@ fun genPublicApi() = buildString {
              */
         """
     )
-    appendln()
+    appendLine()
 
     appendln(
         """
@@ -107,7 +107,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
 }
         """
     )
-    appendln()
+    appendLine()
 
     // PRIMITIVES
 
@@ -127,7 +127,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         appendln(template)
     }
 
-    appendln()
+    appendLine()
 
     for (number in OTHER_PRIMITIVES) {
         val template = """
@@ -137,7 +137,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         appendln(template)
     }
 
-    appendln()
+    appendLine()
 
     // ARRAYS
 
@@ -154,7 +154,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             sealed class PrimitiveArrayValue<T : Any> : ArrayValue<T>()
         """
     )
-    appendln()
+    appendLine()
 
     for (number in (NUMBERS + OTHER_PRIMITIVES).filterNot { it == "String" }) {
         appendln(
@@ -164,10 +164,10 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             }
     """
         )
-        appendln()
+        appendLine()
     }
 
-    appendln()
+    appendLine()
 
     //   TYPED ARRAYS
 
@@ -178,7 +178,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             }
     """
     )
-    appendln()
+    appendLine()
 
     for (number in (NUMBERS + OTHER_PRIMITIVES)) {
         appendln(
@@ -188,7 +188,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         )
     }
 
-    appendln()
+    appendLine()
 
     //   TYPED LISTS / SETS
     for (collectionName in listOf("List", "Set")) {
@@ -207,14 +207,14 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             appendln(template)
         }
 
-        appendln()
+        appendLine()
         // SETTING
         appendln(
             """
         abstract class Setting${collectionName}Value<T: Setting> internal constructor() : Value<${collectionName}<T>>(), ${collectionName}<T>
     """
         )
-        appendln()
+        appendLine()
     }
 
     // SETTING VALUE
@@ -225,7 +225,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
         """
     )
 
-    appendln()
+    appendLine()
 
     // MUTABLE LIST / MUTABLE SET
     for (collectionName in listOf("List", "Set")) {
@@ -235,7 +235,7 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
     """
         )
 
-        appendln()
+        appendLine()
 
         for (number in (NUMBERS + OTHER_PRIMITIVES)) {
             appendln(
@@ -245,17 +245,17 @@ sealed class Value<T : Any> : ReadWriteProperty<Setting, T> {
             )
         }
 
-        appendln()
+        appendLine()
         // SETTING
         appendln(
             """
         abstract class MutableSetting${collectionName}Value<T: Setting> internal constructor() : Value<Mutable${collectionName}<T>>(), Mutable${collectionName}<T>
     """
         )
-        appendln()
+        appendLine()
     }
 
-    appendln()
+    appendLine()
     // DYNAMIC
 
     appendln(
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/setting/SettingCodegen.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/setting/SettingCodegen.kt
deleted file mode 100644
index 9c97af271..000000000
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/setting/SettingCodegen.kt
+++ /dev/null
@@ -1,11 +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
- */
-
-package net.mamoe.mirai.console.codegen.setting
-
diff --git a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt
index 172819f94..247a8ced0 100644
--- a/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt
+++ b/backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt
@@ -7,11 +7,91 @@
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
 
+@file:Suppress("NOTHING_TO_INLINE", "MemberVisibilityCanBePrivate", "unused")
+
 package net.mamoe.mirai.console.codegen
 
+import org.intellij.lang.annotations.Language
 import java.io.File
 
-fun codegen(targetFile: String, regionName: String, block: StringBuilder.() -> Unit) {
+
+typealias KtByte = KtType.KtPrimitive.KtByte
+typealias KtShort = KtType.KtPrimitive.KtShort
+typealias KtInt = KtType.KtPrimitive.KtInt
+typealias KtLong = KtType.KtPrimitive.KtLong
+typealias KtFloat = KtType.KtPrimitive.KtFloat
+typealias KtDouble = KtType.KtPrimitive.KtDouble
+typealias KtChar = KtType.KtPrimitive.KtChar
+typealias KtBoolean = KtType.KtPrimitive.KtBoolean
+
+typealias KtString = KtType.KtString
+
+typealias KtCollection = KtType.KtCollection
+typealias KtMap = KtType.KtMap
+
+typealias KtPrimitive = KtType.KtPrimitive
+
+
+sealed class KtType {
+    /**
+     * Its classname in standard library
+     */
+    abstract val standardName: String
+    override fun toString(): String = standardName
+
+    /**
+     * Not Including [String]
+     */
+    sealed class KtPrimitive(
+        override val standardName: String,
+        val jPrimitiveName: String = standardName.toLowerCase(),
+        val jObjectName: String = standardName
+    ) : KtType() {
+        object KtByte : KtPrimitive("Byte")
+        object KtShort : KtPrimitive("Short")
+        object KtInt : KtPrimitive("Int", jObjectName = "Integer")
+        object KtLong : KtPrimitive("Long")
+
+        object KtFloat : KtPrimitive("Float")
+        object KtDouble : KtPrimitive("Double")
+
+        object KtChar : KtPrimitive("Char", jObjectName = "Character")
+        object KtBoolean : KtPrimitive("Boolean")
+    }
+
+    object KtString : KtType() {
+        override val standardName: String get() = "String"
+    }
+
+    /**
+     * [List], [Set]
+     */
+    data class KtCollection(override val standardName: String) : KtType()
+
+    object KtMap : KtType() {
+        override val standardName: String get() = "Map"
+    }
+
+    companion object {
+        val PrimitiveIntegers = listOf(KtByte, KtShort, KtInt, KtLong)
+        val PrimitiveFloatings = listOf(KtFloat, KtDouble)
+
+        val PrimitiveNumbers = PrimitiveIntegers + PrimitiveFloatings
+        val PrimitiveNonNumbers = listOf(KtChar, KtBoolean)
+
+        val Primitives = PrimitiveNumbers + PrimitiveNonNumbers
+    }
+}
+
+operator fun KtType.plus(type: KtType): List<KtType> {
+    return listOf(this, type)
+}
+
+val KtType.lowerCaseName: String get() = this.standardName.toLowerCase()
+
+inline fun kCode(@Language("kt") source: String) = source.trimIndent()
+
+fun codegen(targetFile: String, block: CodegenScope.() -> Unit) {
     //// region PrimitiveValue CODEGEN START ////
     //// region PrimitiveValue CODEGEN END ////
 
@@ -19,17 +99,11 @@ fun codegen(targetFile: String, regionName: String, block: StringBuilder.() -> U
         println("Codegen target: ${it.absolutePath}")
     }.apply {
         writeText(
-            readText()
-                .replace(Regex("""//// region $regionName CODEGEN START ////([\s\S]*?)//// endregion $regionName CODEGEN END ////""")) {
-                    val code = StringBuilder().apply(block).toString()
-                    """
-                        |//// region $regionName CODEGEN START ////
-                        |
-                        |$code
-                        |
-                        |//// endregion $regionName CODEGEN END ////
-                    """.trimMargin()
+            CodegenScope().apply(block).also { list ->
+                list.forEach {
+                    println("Applying replacement: $it")
                 }
+            }.applyTo(readText())
         )
     }
 }
@@ -48,7 +122,7 @@ fun String.findFileSmart(): File = kotlin.run {
 }
 
 fun main() {
-    codegen("Value.kt", "PrimitiveValue") {
-
+    codegen("Value.kt") {
+        SettingCodegen.PrimitiveValuesCodegen()
     }
 }
\ No newline at end of file