Rearrange implementations

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

@@ -64,7 +64,7 @@ interface MiraiConsole {
     @MiraiExperimentalAPI
     fun newLogger(identity: String?): MiraiLogger
 
-    companion object INSTANCE : MiraiConsole by MiraiConsoleImpl
+    companion object INSTANCE : MiraiConsole by MiraiConsoleInternal
 }
 
 
@@ -77,7 +77,7 @@ internal object MiraiConsoleInitializer {
     /** 由前端调用 */
     internal fun init(instance: IMiraiConsole) {
         this.instance = instance
-        MiraiConsoleImpl.initialize()
+        MiraiConsoleInternal.initialize()
     }
 }
 
@@ -90,7 +90,7 @@ internal object MiraiConsoleBuildConstants { // auto-filled on build (task :mira
 /**
  * mirai 控制台实例.
  */
-internal object MiraiConsoleImpl : CoroutineScope, IMiraiConsole, MiraiConsole {
+internal object MiraiConsoleInternal : CoroutineScope, IMiraiConsole, MiraiConsole {
     override val pluginCenter: PluginCenter get() = CuiPluginCenter
 
     private val instance: IMiraiConsole

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/Command.kt

@@ -11,17 +11,15 @@
 
 package net.mamoe.mirai.console.command
 
-import net.mamoe.mirai.console.command.description.*
-import net.mamoe.mirai.message.data.PlainText
 import net.mamoe.mirai.message.data.SingleMessage
-import kotlin.reflect.KAnnotatedElement
-import kotlin.reflect.KClass
-import kotlin.reflect.full.*
 
 /**
  * 指令
  * 通常情况下, 你的指令应继承 @see CompositeCommand/SimpleCommand
  * @see register 注册这个指令
+ *
+ * @see SimpleCommand
+ * @see CompositeCommand
  */
 interface Command {
     /**
@@ -30,6 +28,7 @@ interface Command {
     val names: Array<out String>
 
     val usage: String
+
     val description: String
 
     /**
@@ -47,289 +46,12 @@ interface Command {
     /**
      * @param args 指令参数. 可能是 [SingleMessage] 或 [String]. 且已经以 ' ' 分割.
      */
-    suspend fun onCommand(sender: CommandSender, args: Array<out Any>)
+    suspend fun CommandSender.onCommand(args: Array<out Any>)
 }
 
+suspend inline fun Command.onCommand(sender: CommandSender, args: Array<out Any>) = sender.run { onCommand(args) }
+
 /**
  * 主要指令名. 为 [Command.names] 的第一个元素.
  */
 val Command.primaryName: String get() = names[0]
-
-/**
- * 功能最集中的Commend
- * 支持且只支持有sub的指令
- * 例:
- *  /mute add
- *  /mute remove
- *  /mute addandremove  (sub is case insensitive, lowercase are recommend)
- *  /mute add and remove('add and remove' consider as a sub)
- */
-abstract class CompositeCommand @JvmOverloads constructor(
-    override val owner: CommandOwner,
-    vararg names: String,
-    description: String = "no description available",
-    override val permission: CommandPermission = CommandPermission.Default,
-    override val prefixOptional: Boolean = false,
-    overrideContext: CommandParserContext = EmptyCommandParserContext
-) : Command {
-    override val description = description.trimIndent()
-    override val names: Array<out String> =
-        names.map(String::trim).filterNot(String::isEmpty).map(String::toLowerCase).also { list ->
-            list.firstOrNull { !it.isValidSubName() }?.let {
-                error("Name is not valid: $it")
-            }
-        }.toTypedArray()
-
-    /**
-     * [CommandArgParser] 的环境
-     */
-    val context: CommandParserContext = CommandParserContext.Builtins + overrideContext
-
-    override var usage: String = "<command build failed>" // initialized by subCommand reflection
-        internal set
-
-    /** 指定子指令要求的权限 */
-    @Retention(AnnotationRetention.RUNTIME)
-    @Target(AnnotationTarget.FUNCTION)
-    annotation class Permission(val permission: KClass<out CommandPermission>)
-
-    /** 标记一个函数为子指令 */
-    @Retention(AnnotationRetention.RUNTIME)
-    @Target(AnnotationTarget.FUNCTION)
-    annotation class SubCommand(vararg val name: String)
-
-    /** 指令描述 */
-    @Retention(AnnotationRetention.RUNTIME)
-    @Target(AnnotationTarget.FUNCTION)
-    annotation class Description(val description: String)
-
-    /** 参数名, 将参与构成 [usage] */
-    @Retention(AnnotationRetention.RUNTIME)
-    @Target(AnnotationTarget.VALUE_PARAMETER)
-    annotation class Name(val name: String)
-
-    final override suspend fun onCommand(sender: CommandSender, args: Array<out Any>) {
-        matchSubCommand(args)?.parseAndExecute(sender, args) ?: kotlin.run {
-            defaultSubCommand.onCommand(sender, args)
-        }
-        subCommands
-    }
-
-    internal val defaultSubCommand: DefaultSubCommandDescriptor by lazy {
-        DefaultSubCommandDescriptor(
-            "",
-            CommandPermission.Default,
-            onCommand = block { sender: CommandSender, args: Array<out Any> ->
-                false//not supported yet
-            }
-        )
-    }
-
-
-    class IllegalParameterException internal constructor(message: String) : Exception(message)
-
-    internal val subCommands: Array<SubCommandDescriptor> by lazy {
-
-        val buildUsage = StringBuilder(this.description).append(": \n")
-
-        this@CompositeCommand::class.declaredFunctions.filter { it.hasAnnotation<SubCommand>() }.map { function ->
-
-            val notStatic = function.findAnnotation<JvmStatic>()==null
-            val overridePermission = function.findAnnotation<Permission>()//optional
-            val subDescription = function.findAnnotation<Description>()?.description?:"no description available"
-
-            if ((function.returnType.classifier as? KClass<*>)?.isSubclassOf(Boolean::class) != true) {
-                throw IllegalParameterException("Return Type of SubCommand must be Boolean")
-            }
-
-            val parameter = function.parameters.toMutableList()
-            if (parameter.isEmpty()){
-                throw IllegalParameterException("First parameter (receiver for kotlin) for sub commend " + function.name + " from " + this.primaryName + " should be <out CommandSender>")
-            }
-
-            if (notStatic) {
-                parameter.removeAt(0)
-            }
-
-            (parameter.removeAt(0)).let {receiver ->
-                if (
-                    receiver.isVararg ||
-                    ((receiver.type.classifier as? KClass<*>).also { print(it) }
-                        ?.isSubclassOf(CommandSender::class) != true)
-                ) {
-                    throw IllegalParameterException("First parameter (receiver for kotlin) for sub commend " + function.name + " from " + this.primaryName + " should be <out CommandSender>")
-                }
-            }
-
-            val commandName = function.findAnnotation<SubCommand>()!!.name.map {
-                if (!it.isValidSubName()) {
-                    error("SubName $it is not valid")
-                }
-                it
-            }.toTypedArray()
-
-            //map parameter
-            val parms = parameter.map {
-                buildUsage.append("/$primaryName ")
-
-                if (it.isVararg) {
-                    throw IllegalParameterException("parameter for sub commend " + function.name + " from " + this.primaryName + " should not be var arg")
-                }
-                if (it.isOptional) {
-                    throw IllegalParameterException("parameter for sub commend " + function.name + " from " + this.primaryName + " should not be var optional")
-                }
-
-                val argName = it.findAnnotation<Name>()?.name ?: it.name ?: "unknown"
-                buildUsage.append("<").append(argName).append("> ").append(" ")
-                CommandParam(
-                    argName,
-                    (it.type.classifier as? KClass<*>)
-                        ?: throw IllegalParameterException("unsolved type reference from param " + it.name + " in " + function.name + " from " + this.primaryName)
-                )
-            }.toTypedArray()
-
-            buildUsage.append(subDescription).append("\n")
-
-            SubCommandDescriptor(
-                commandName,
-                parms,
-                subDescription,
-                overridePermission?.permission?.getInstance() ?: permission,
-                onCommand = block { sender: CommandSender, args: Array<out Any> ->
-                    if (notStatic) {
-                        function.callSuspend(this, sender, *args) as Boolean
-                    } else {
-                        function.callSuspend(sender, *args) as Boolean
-                    }
-                }
-            )
-
-        }.toTypedArray().also {
-            usage = buildUsage.toString()
-        }
-    }
-
-    private fun block(block: suspend (CommandSender, Array<out Any>) -> Boolean): suspend (CommandSender, Array<out Any>) -> Boolean {
-        return block
-    }
-
-    @JvmField
-    internal val bakedCommandNameToSubDescriptorArray: Map<Array<String>, SubCommandDescriptor> = kotlin.run {
-        val map = LinkedHashMap<Array<String>, SubCommandDescriptor>(subCommands.size * 2)
-        for (descriptor in subCommands) {
-            for (name in descriptor.bakedSubNames) {
-                map[name] = descriptor
-            }
-        }
-        map.toSortedMap(Comparator { o1, o2 -> o1!!.contentHashCode() - o2!!.contentHashCode() })
-    }
-
-    internal inner class DefaultSubCommandDescriptor(
-        val description: String,
-        val permission: CommandPermission,
-        val onCommand: suspend (sender: CommandSender, rawArgs: Array<out Any>) -> Boolean
-    )
-
-    internal inner class SubCommandDescriptor(
-        val names: Array<String>,
-        val params: Array<CommandParam<*>>,
-        val description: String,
-        val permission: CommandPermission,
-        val onCommand: suspend (sender: CommandSender, parsedArgs: Array<out Any>) -> Boolean
-    ) {
-        internal suspend inline fun parseAndExecute(
-            sender: CommandSender,
-            argsWithSubCommandNameNotRemoved: Array<out Any>
-        ) {
-            if (!onCommand(sender, parseArgs(sender, argsWithSubCommandNameNotRemoved, names.size))) {
-                sender.sendMessage(usage)
-            }
-        }
-
-        @JvmField
-        internal val bakedSubNames: Array<Array<String>> = names.map { it.bakeSubName() }.toTypedArray()
-        private fun parseArgs(sender: CommandSender, rawArgs: Array<out Any>, offset: Int): Array<out Any> {
-            require(rawArgs.size >= offset + this.params.size) { "No enough args. Required ${params.size}, but given ${rawArgs.size - offset}" }
-
-            return Array(this.params.size) { index ->
-                val param = params[index]
-                val rawArg = rawArgs[offset + index]
-                when (rawArg) {
-                    is String -> context[param.type]?.parse(rawArg, sender)
-                    is SingleMessage -> context[param.type]?.parse(rawArg, sender)
-                    else -> throw IllegalArgumentException("Illegal argument type: ${rawArg::class.qualifiedName}")
-                } ?: error("Cannot find a parser for $rawArg")
-            }
-        }
-    }
-
-    /**
-     * @param rawArgs 元素类型必须为 [SingleMessage] 或 [String], 且已经经过扁平化处理. 否则抛出异常 [IllegalArgumentException]
-     */
-    internal fun matchSubCommand(rawArgs: Array<out Any>): SubCommandDescriptor? {
-        val maxCount = rawArgs.size - 1
-        var cur = 0
-        bakedCommandNameToSubDescriptorArray.forEach { (name, descriptor) ->
-            if (name.size != cur) {
-                if (cur++ == maxCount) return null
-            }
-            if (name.contentEqualsOffset(rawArgs, length = cur)) {
-                return descriptor
-            }
-        }
-        return null
-    }
-}
-
-
-abstract class SimpleCommand(
-    override val owner: CommandOwner,
-    val name: String,
-    val alias: Array<String> = arrayOf()
-) : Command {
-    abstract suspend fun CommandSender.onCommand(args: List<Any>)
-}
-
-abstract class RawCommand(
-    final override val owner: CommandOwner,
-    name: String,
-    alias: Array<String> = arrayOf()
-) : Command {
-    final override val names: Array<String> = arrayOf(name, *alias)
-}
-
-
-private fun <T> Array<T>.contentEqualsOffset(other: Array<out Any>, length: Int): Boolean {
-    repeat(length) { index ->
-        if (other[index].toString() != this[index]) {
-            return false
-        }
-    }
-    return true
-}
-
-internal val ILLEGAL_SUB_NAME_CHARS = "\\/!@#$%^&*()_+-={}[];':\",.<>?`~".toCharArray()
-internal fun String.isValidSubName(): Boolean = ILLEGAL_SUB_NAME_CHARS.none { it in this }
-internal fun String.bakeSubName(): Array<String> = split(' ').filterNot { it.isBlank() }.toTypedArray()
-
-internal fun Any.flattenCommandComponents(): ArrayList<Any> {
-    val list = ArrayList<Any>()
-    when (this::class.java) { // faster than is
-        String::class.java -> (this as String).splitToSequence(' ').filterNot { it.isBlank() }.forEach { list.add(it) }
-        PlainText::class.java -> (this as PlainText).content.splitToSequence(' ').filterNot { it.isBlank() }
-            .forEach { list.add(it) }
-        SingleMessage::class.java -> list.add(this as SingleMessage)
-        Array<Any>::class.java -> (this as Array<*>).forEach { if (it != null) list.addAll(it.flattenCommandComponents()) }
-        Iterable::class.java -> (this as Iterable<*>).forEach { if (it != null) list.addAll(it.flattenCommandComponents()) }
-        else -> list.add(this.toString())
-    }
-    return list
-}
-
-internal inline fun <reified T : Annotation> KAnnotatedElement.hasAnnotation(): Boolean =
-    findAnnotation<T>() != null
-
-internal inline fun <T : Any> KClass<out T>.getInstance(): T {
-    return this.objectInstance ?: this.createInstance()
-}
-

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandManager.kt

@@ -18,6 +18,8 @@ package net.mamoe.mirai.console.command
 import kotlinx.atomicfu.locks.withLock
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
+import net.mamoe.mirai.console.MiraiConsoleInternal
+import net.mamoe.mirai.console.command.internal.*
 import net.mamoe.mirai.console.plugin.Plugin
 import net.mamoe.mirai.message.data.Message
 import net.mamoe.mirai.message.data.MessageChain
@@ -50,7 +52,11 @@ abstract class PluginCommandOwner(val plugin: Plugin) : CommandOwner() {
  *
  * 由前端实现
  */
-internal abstract class ConsoleCommandOwner : CommandOwner()
+internal abstract class ConsoleCommandOwner : CommandOwner() {
+    companion object {
+        internal val instance get() = MiraiConsoleInternal.consoleCommandOwner
+    }
+}
 
 /**
  * 获取已经注册了的属于这个 [CommandOwner] 的指令列表.

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CommandSender.kt

@@ -13,18 +13,17 @@ package net.mamoe.mirai.console.command
 
 import kotlinx.coroutines.runBlocking
 import net.mamoe.mirai.Bot
-import net.mamoe.mirai.console.MiraiConsole
 import net.mamoe.mirai.console.utils.JavaFriendlyAPI
 import net.mamoe.mirai.contact.*
 import net.mamoe.mirai.message.MessageEvent
 import net.mamoe.mirai.message.data.Message
 import net.mamoe.mirai.message.data.PlainText
-import org.jetbrains.annotations.Contract
 
 /**
  * 指令发送者
  *
- * @see AbstractCommandSender 请继承于该抽象类
+ * @see ConsoleCommandSender
+ * @see UserCommandSender
  */
 @Suppress("FunctionName")
 interface CommandSender {

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/CompositeCommand.kt

@@ -0,0 +1,80 @@
+/*
+ * 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("EXPOSED_SUPER_CLASS", "NOTHING_TO_INLINE")
+
+package net.mamoe.mirai.console.command
+
+import net.mamoe.mirai.console.command.description.CommandArgParser
+import net.mamoe.mirai.console.command.description.CommandParserContext
+import net.mamoe.mirai.console.command.description.EmptyCommandParserContext
+import net.mamoe.mirai.console.command.description.plus
+import net.mamoe.mirai.console.command.internal.CompositeCommandImpl
+import net.mamoe.mirai.console.command.internal.isValidSubName
+import kotlin.reflect.KClass
+
+
+/**
+ * 功能最集中的Commend
+ * 支持且只支持有sub的指令
+ * 例:
+ *  /mute add
+ *  /mute remove
+ *  /mute addandremove  (sub is case insensitive, lowercase are recommend)
+ *  /mute add and remove('add and remove' consider as a sub)
+ */
+abstract class CompositeCommand @JvmOverloads constructor(
+    final override val owner: CommandOwner,
+    vararg names: String,
+    description: String = "no description available",
+    final override val permission: CommandPermission = CommandPermission.Default,
+    final override val prefixOptional: Boolean = false,
+    overrideContext: CommandParserContext = EmptyCommandParserContext
+) : Command, CompositeCommandImpl() {
+    final override val description = description.trimIndent()
+    final override val names: Array<out String> =
+        names.map(String::trim).filterNot(String::isEmpty).map(String::toLowerCase).also { list ->
+            list.firstOrNull { !it.isValidSubName() }?.let {
+                error("Name is not valid: $it")
+            }
+        }.toTypedArray()
+
+    /**
+     * [CommandArgParser] 的环境
+     */
+    val context: CommandParserContext = CommandParserContext.Builtins + overrideContext
+
+    final override val usage: String get() = super.usage
+
+    /** 指定子指令要求的权限 */
+    @Retention(AnnotationRetention.RUNTIME)
+    @Target(AnnotationTarget.FUNCTION)
+    annotation class Permission(val permission: KClass<out CommandPermission>)
+
+    /** 标记一个函数为子指令 */
+    @Retention(AnnotationRetention.RUNTIME)
+    @Target(AnnotationTarget.FUNCTION)
+    annotation class SubCommand(vararg val name: String)
+
+    /** 指令描述 */
+    @Retention(AnnotationRetention.RUNTIME)
+    @Target(AnnotationTarget.FUNCTION)
+    annotation class Description(val description: String)
+
+    /** 参数名, 将参与构成 [usage] */
+    @Retention(AnnotationRetention.RUNTIME)
+    @Target(AnnotationTarget.VALUE_PARAMETER)
+    annotation class Name(val name: String)
+
+    final override suspend fun onCommand(sender: CommandSender, args: Array<out Any>) {
+        matchSubCommand(args)?.parseAndExecute(sender, args) ?: kotlin.run {
+            defaultSubCommand.onCommand(sender, args)
+        }
+    }
+}

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/SimpleCommand.kt

@@ -0,0 +1,12 @@
+package net.mamoe.mirai.console.command
+
+abstract class SimpleCommand(
+    override val owner: CommandOwner,
+    override vararg val names: String,
+    override val usage: String,
+    override val description: String,
+    override val permission: CommandPermission = CommandPermission.Default,
+    override val prefixOptional: Boolean = false
+) : Command {
+    abstract override suspend fun CommandSender.onCommand(args: Array<out Any>)
+}

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/description/CommandArgParser.kt

@@ -20,9 +20,11 @@ import kotlin.contracts.contract
  * this output type of that arg
  * input is always String
  */
-abstract class CommandArgParser<out T : Any> {
-    abstract fun parse(raw: String, sender: CommandSender): T
-    open fun parse(raw: SingleMessage, sender: CommandSender): T = parse(raw.content, sender)
+interface CommandArgParser<out T : Any> {
+    fun parse(raw: String, sender: CommandSender): T
+
+    @JvmDefault
+    fun parse(raw: SingleMessage, sender: CommandSender): T = parse(raw.content, sender)
 }
 
 fun <T : Any> CommandArgParser<T>.parse(raw: Any, sender: CommandSender): T {
@@ -61,7 +63,7 @@ inline fun CommandArgParser<*>.checkArgument(
 @JvmSynthetic
 inline fun <T : Any> CommandArgParser(
     crossinline parser: CommandArgParser<T>.(s: String, sender: CommandSender) -> T
-): CommandArgParser<T> = object : CommandArgParser<T>() {
+): CommandArgParser<T> = object : CommandArgParser<T> {
     override fun parse(raw: String, sender: CommandSender): T = parser(raw, sender)
 }
 

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/description/CommandArgParserBuiltins.kt

@@ -10,7 +10,11 @@
 package net.mamoe.mirai.console.command.description
 
 import net.mamoe.mirai.Bot
-import net.mamoe.mirai.console.command.*
+import net.mamoe.mirai.console.command.BotAwareCommandSender
+import net.mamoe.mirai.console.command.CommandSender
+import net.mamoe.mirai.console.command.MemberCommandSender
+import net.mamoe.mirai.console.command.UserCommandSender
+import net.mamoe.mirai.console.command.internal.fuzzySearchMember
 import net.mamoe.mirai.contact.Friend
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/internal/CompositeCommandImpl.kt

@@ -0,0 +1,219 @@
+/*
+ * 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("NOTHING_TO_INLINE", "MemberVisibilityCanBePrivate")
+
+package net.mamoe.mirai.console.command.internal
+
+import net.mamoe.mirai.console.command.*
+import net.mamoe.mirai.console.command.description.CommandParam
+import net.mamoe.mirai.message.data.PlainText
+import net.mamoe.mirai.message.data.SingleMessage
+import kotlin.reflect.KAnnotatedElement
+import kotlin.reflect.KClass
+import kotlin.reflect.full.*
+
+internal abstract class CompositeCommandImpl : Command {
+    @JvmField
+    @Suppress("PropertyName")
+    internal var _usage: String = "<command build failed>"
+
+    override val usage: String  // initialized by subCommand reflection
+        get() = _usage
+
+    internal val defaultSubCommand: DefaultSubCommandDescriptor by lazy {
+        DefaultSubCommandDescriptor(
+            "",
+            CommandPermission.Default,
+            onCommand = block { sender: CommandSender, args: Array<out Any> ->
+                false//not supported yet
+            }
+        )
+    }
+
+    internal val subCommands: Array<SubCommandDescriptor> by lazy {
+        @Suppress("CAST_NEVER_SUCCEEDS")
+        this as CompositeCommand
+
+        val buildUsage = StringBuilder(this.description).append(": \n")
+
+        this::class.declaredFunctions.filter { it.hasAnnotation<CompositeCommand.SubCommand>() }.map { function ->
+            val notStatic = !function.hasAnnotation<JvmStatic>()
+            val overridePermission = function.findAnnotation<CompositeCommand.Permission>()//optional
+            val subDescription =
+                function.findAnnotation<CompositeCommand.Description>()?.description ?: "no description available"
+
+            if ((function.returnType.classifier as? KClass<*>)?.isSubclassOf(Boolean::class) != true) {
+                error("Return Type of SubCommand must be Boolean")
+            }
+
+            val parameters = function.parameters.toMutableList()
+            check(parameters.isNotEmpty()) {
+                "First parameter (receiver for kotlin) for sub commend " + function.name + " from " + this.primaryName + " should be <out CommandSender>"
+            }
+
+            if (notStatic) parameters.removeAt(0) // instance
+
+            (parameters.removeAt(0)).let { receiver ->
+                check(!receiver.isVararg && !((receiver.type.classifier as? KClass<*>).also { print(it) }
+                    ?.isSubclassOf(CommandSender::class) != true)) {
+                    "First parameter (receiver for kotlin) for sub commend " + function.name + " from " + this.primaryName + " should be <out CommandSender>"
+                }
+            }
+
+            val commandName = function.findAnnotation<CompositeCommand.SubCommand>()!!.name.map {
+                if (!it.isValidSubName()) {
+                    error("SubName $it is not valid")
+                }
+                it
+            }.toTypedArray()
+
+            //map parameter
+            val params = parameters.map { param ->
+                buildUsage.append("/$primaryName ")
+
+                if (param.isVararg) error("parameter for sub commend " + function.name + " from " + this.primaryName + " should not be var arg")
+                if (param.isOptional) error("parameter for sub commend " + function.name + " from " + this.primaryName + " should not be var optional")
+
+                val argName = param.findAnnotation<CompositeCommand.Name>()?.name ?: param.name ?: "unknown"
+                buildUsage.append("<").append(argName).append("> ").append(" ")
+                CommandParam(
+                    argName,
+                    (param.type.classifier as? KClass<*>)
+                        ?: throw IllegalArgumentException("unsolved type reference from param " + param.name + " in " + function.name + " from " + this.primaryName)
+                )
+            }.toTypedArray()
+
+            buildUsage.append(subDescription).append("\n")
+
+            SubCommandDescriptor(
+                commandName,
+                params,
+                subDescription,
+                overridePermission?.permission?.getInstance() ?: permission,
+                onCommand = block { sender: CommandSender, args: Array<out Any> ->
+                    if (notStatic) {
+                        function.callSuspend(this, sender, *args) as Boolean
+                    } else {
+                        function.callSuspend(sender, *args) as Boolean
+                    }
+                }
+            )
+        }.toTypedArray().also {
+            _usage = buildUsage.toString()
+        }
+    }
+
+    private fun block(block: suspend (CommandSender, Array<out Any>) -> Boolean): suspend (CommandSender, Array<out Any>) -> Boolean {
+        return block
+    }
+
+    @JvmField
+    internal val bakedCommandNameToSubDescriptorArray: Map<Array<String>, SubCommandDescriptor> = kotlin.run {
+        val map = LinkedHashMap<Array<String>, SubCommandDescriptor>(subCommands.size * 2)
+        for (descriptor in subCommands) {
+            for (name in descriptor.bakedSubNames) {
+                map[name] = descriptor
+            }
+        }
+        map.toSortedMap(Comparator { o1, o2 -> o1!!.contentHashCode() - o2!!.contentHashCode() })
+    }
+
+    internal class DefaultSubCommandDescriptor(
+        val description: String,
+        val permission: CommandPermission,
+        val onCommand: suspend (sender: CommandSender, rawArgs: Array<out Any>) -> Boolean
+    )
+
+    internal inner class SubCommandDescriptor(
+        val names: Array<String>,
+        val params: Array<CommandParam<*>>,
+        val description: String,
+        val permission: CommandPermission,
+        val onCommand: suspend (sender: CommandSender, parsedArgs: Array<out Any>) -> Boolean
+    ) {
+        internal suspend inline fun parseAndExecute(
+            sender: CommandSender,
+            argsWithSubCommandNameNotRemoved: Array<out Any>
+        ) {
+            if (!onCommand(sender, parseArgs(sender, argsWithSubCommandNameNotRemoved, names.size))) {
+                sender.sendMessage(usage)
+            }
+        }
+
+        @JvmField
+        internal val bakedSubNames: Array<Array<String>> = names.map { it.bakeSubName() }.toTypedArray()
+        private fun parseArgs(sender: CommandSender, rawArgs: Array<out Any>, offset: Int): Array<out Any> {
+            @Suppress("CAST_NEVER_SUCCEEDS")
+            this as CompositeCommand
+            require(rawArgs.size >= offset + this.params.size) { "No enough args. Required ${params.size}, but given ${rawArgs.size - offset}" }
+
+            return Array(this.params.size) { index ->
+                val param = params[index]
+                val rawArg = rawArgs[offset + index]
+                when (rawArg) {
+                    is String -> context[param.type]?.parse(rawArg, sender)
+                    is SingleMessage -> context[param.type]?.parse(rawArg, sender)
+                    else -> throw IllegalArgumentException("Illegal argument type: ${rawArg::class.qualifiedName}")
+                } ?: error("Cannot find a parser for $rawArg")
+            }
+        }
+    }
+
+    /**
+     * @param rawArgs 元素类型必须为 [SingleMessage] 或 [String], 且已经经过扁平化处理. 否则抛出异常 [IllegalArgumentException]
+     */
+    internal fun matchSubCommand(rawArgs: Array<out Any>): SubCommandDescriptor? {
+        val maxCount = rawArgs.size - 1
+        var cur = 0
+        bakedCommandNameToSubDescriptorArray.forEach { (name, descriptor) ->
+            if (name.size != cur) {
+                if (cur++ == maxCount) return null
+            }
+            if (name.contentEqualsOffset(rawArgs, length = cur)) {
+                return descriptor
+            }
+        }
+        return null
+    }
+}
+
+internal fun <T> Array<T>.contentEqualsOffset(other: Array<out Any>, length: Int): Boolean {
+    repeat(length) { index ->
+        if (other[index].toString() != this[index]) {
+            return false
+        }
+    }
+    return true
+}
+
+internal val ILLEGAL_SUB_NAME_CHARS = "\\/!@#$%^&*()_+-={}[];':\",.<>?`~".toCharArray()
+internal fun String.isValidSubName(): Boolean = ILLEGAL_SUB_NAME_CHARS.none { it in this }
+internal fun String.bakeSubName(): Array<String> = split(' ').filterNot { it.isBlank() }.toTypedArray()
+
+internal fun Any.flattenCommandComponents(): ArrayList<Any> {
+    val list = ArrayList<Any>()
+    when (this::class.java) { // faster than is
+        String::class.java -> (this as String).splitToSequence(' ').filterNot { it.isBlank() }.forEach { list.add(it) }
+        PlainText::class.java -> (this as PlainText).content.splitToSequence(' ').filterNot { it.isBlank() }
+            .forEach { list.add(it) }
+        SingleMessage::class.java -> list.add(this as SingleMessage)
+        Array<Any>::class.java -> (this as Array<*>).forEach { if (it != null) list.addAll(it.flattenCommandComponents()) }
+        Iterable::class.java -> (this as Iterable<*>).forEach { if (it != null) list.addAll(it.flattenCommandComponents()) }
+        else -> list.add(this.toString())
+    }
+    return list
+}
+
+internal inline fun <reified T : Annotation> KAnnotatedElement.hasAnnotation(): Boolean =
+    findAnnotation<T>() != null
+
+internal inline fun <T : Any> KClass<out T>.getInstance(): T {
+    return this.objectInstance ?: this.createInstance()
+}

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/internal/internal.kt

@@ -7,8 +7,9 @@
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
 
-package net.mamoe.mirai.console.command
+package net.mamoe.mirai.console.command.internal
 
+import net.mamoe.mirai.console.command.*
 import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member
 import java.util.concurrent.locks.ReentrantLock
@@ -51,7 +52,9 @@ internal object InternalCommandManager {
      */
     internal fun matchCommand(rawCommand: String): Command? {
         if (rawCommand.startsWith(COMMAND_PREFIX)) {
-            return requiredPrefixCommandMap[rawCommand.substringAfter(COMMAND_PREFIX)]
+            return requiredPrefixCommandMap[rawCommand.substringAfter(
+                COMMAND_PREFIX
+            )]
         }
         return optionalPrefixCommandMap[rawCommand]
     }
@@ -170,10 +173,16 @@ internal suspend inline fun CommandSender.executeCommandInternal(
     messages: Any,
     commandName: String
 ): Command? {
-    val command = InternalCommandManager.matchCommand(commandName) ?: return null
+    val command = InternalCommandManager.matchCommand(
+        commandName
+    ) ?: return null
 
     if (!command.testPermission(this)) {
-        throw CommandExecutionException(command, commandName, CommandPermissionDeniedException(command))
+        throw CommandExecutionException(
+            command,
+            commandName,
+            CommandPermissionDeniedException(command)
+        )
     }
 
     kotlin.runCatching {

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/event/CommandExecutionEvent.kt

@@ -9,16 +9,12 @@
 
 package net.mamoe.mirai.console.event
 
-import net.mamoe.mirai.console.command.Command
-import net.mamoe.mirai.console.command.CommandSender
-import net.mamoe.mirai.event.AbstractEvent
-import net.mamoe.mirai.event.CancellableEvent
-
+/*
 data class CommandExecutionEvent( // TODO: 2020/6/26  impl CommandExecutionEvent
     val sender: CommandSender,
     val command: Command,
     val rawArgs: Array<Any>
-) : AbstractEvent(), CancellableEvent, ConsoleEvent {
+) : CancellableEvent, ConsoleEvent, AbstractEvent() {
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (javaClass != other?.javaClass) return false
@@ -39,3 +35,4 @@ data class CommandExecutionEvent( // TODO: 2020/6/26  impl CommandExecutionEvent
         return result
     }
 }
+*/

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/internal/JvmPluginImpl.kt

@@ -27,6 +27,9 @@ import kotlin.coroutines.EmptyCoroutineContext
 
 internal val <T> T.job: Job where T : CoroutineScope, T : Plugin get() = this.coroutineContext[Job]!!
 
+/**
+ * Hides implementations from [JvmPlugin]
+ */
 @PublishedApi
 internal abstract class JvmPluginImpl(
     parentCoroutineContext: CoroutineContext

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/jvm/AbstractJvmPlugin.kt

@@ -25,4 +25,6 @@ abstract class AbstractJvmPlugin @JvmOverloads constructor(
     parentCoroutineContext: CoroutineContext = EmptyCoroutineContext
 ) : JvmPlugin, JvmPluginImpl(parentCoroutineContext) {
     // TODO: 2020/6/24 添加 PluginSetting 继承 Setting, 实现 onValueChanged 并绑定自动保存.
+
+    abstract class PluginSetting
 }