Refactor `Commands_Feature` to use API

sources/BaseAPI/Global.uc

@@ -50,6 +50,7 @@ var public UserAPI          users;
 var public PlayersAPI       players;
 var public JsonAPI          json;
 var public SchedulerAPI     scheduler;
+var public CommandAPI       commands;
 var public AvariceAPI       avarice;
 
 var public AcediaEnvironment    environment;
@@ -92,6 +93,7 @@ protected function Initialize() {
     players = PlayersAPI(memory.Allocate(class'PlayersAPI'));
     scheduler = SchedulerAPI(memory.Allocate(class'SchedulerAPI'));
     avarice = AvariceAPI(memory.Allocate(class'AvariceAPI'));
+    commands = CommandAPI(memory.Allocate(class'CommandAPI'));
     environment = AcediaEnvironment(memory.Allocate(class'AcediaEnvironment'));
 }
 
@@ -112,6 +114,7 @@ public function DropCoreAPI() {
     players = none;
     json = none;
     scheduler = none;
+    commands = none;
     avarice = none;
     default.myself = none;
 }

sources/LevelAPI/Features/Commands/CommandAPI.uc

@@ -0,0 +1,114 @@
+/**
+ * Author: dkanus
+ * Home repo: https://www.insultplayers.ru/git/AcediaFramework/AcediaCore
+ * License: GPL
+ * Copyright 2023 Anton Tarasenko
+ *------------------------------------------------------------------------------
+ * This file is part of Acedia.
+ *
+ * Acedia is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Acedia is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Acedia.  If not, see <https://www.gnu.org/licenses/>.
+ */
+class CommandAPI extends AcediaObject;
+
+var private Commands_Feature commandsFeature;
+
+// DO NOT CALL MANUALLY
+public final /*internal*/ function _reloadFeature()
+{
+    if (commandsFeature != none) {
+        commandsFeature.FreeSelf();
+        commandsFeature = none;
+    }
+    commandsFeature = Commands_Feature(class'Commands_Feature'.static.GetEnabledInstance());
+}
+
+/// Checks if `Commands_Feature` is enabled, which is required for this API to be functional.
+public final function bool AreCommandsEnabled() {
+    // `Commands_Feature` is responsible for updating us with an actually enabled instance
+    return (commandsFeature != none);
+}
+
+/// Registers given command class, making it available via `Execute()`.
+///
+/// Returns `true` if command was successfully registered and `false` otherwise`.
+///
+/// # Errors
+///
+/// If `commandClass` provides command with a name that is already taken (comparison is
+/// case-insensitive) by a different command - a warning will be logged and newly passed
+/// `commandClass` discarded.
+public final function bool RegisterCommand(class<Command> commandClass) {
+    if (commandsFeature != none) {
+        return commandsFeature.RegisterCommand(commandClass);
+    }
+    return false;
+}
+
+/// Removes command of given class from the list of registered commands.
+///
+/// Removing once registered commands is not an action that is expected to be performed under normal
+/// circumstances and it is not efficient.
+/// It is linear on the current amount of commands.
+public final function RemoveCommand(class<Command> commandClass) {
+    if (commandsFeature != none) {
+        commandsFeature.RemoveCommand(commandClass);
+    }
+}
+
+/// Executes command based on the input.
+///
+/// Takes [`commandLine`] as input with command's call, finds appropriate registered command
+/// instance and executes it with parameters specified in the [`commandLine`].
+///
+/// [`callerPlayer`] has to be specified and represents instigator of this command that will receive
+/// appropriate result/error messages.
+///
+/// Returns `true` iff command was successfully executed.
+///
+/// # Errors
+///
+/// Doesn't log any errors, but can complain about errors in name or parameters to
+/// the [`callerPlayer`]
+public final function Execute(BaseText commandLine, EPlayer callerPlayer) {
+    if (commandsFeature != none) {
+        commandsFeature.HandleInput(commandLine, callerPlayer);
+    }
+}
+
+/// Executes command based on the input.
+///
+/// Takes [`commandLine`] as input with command's call, finds appropriate registered command
+/// instance and executes it with parameters specified in the [`commandLine`].
+///
+/// [`callerPlayer`] has to be specified and represents instigator of this command that will receive
+/// appropriate result/error messages.
+///
+/// Returns `true` iff command was successfully executed.
+///
+/// # Errors
+///
+/// Doesn't log any errors, but can complain about errors in name or parameters to
+/// the [`callerPlayer`]
+public final function Execute_S(string commandLine, EPlayer callerPlayer) {
+    local MutableText wrapper;
+
+    if (commandsFeature != none) {
+        wrapper = _.text.FromStringM(commandLine);
+        commandsFeature.HandleInput(wrapper, callerPlayer);
+        _.memory.Free(wrapper);
+    }
+}
+
+defaultproperties {
+}

sources/LevelAPI/Features/Commands/Commands.uc

@@ -1,6 +1,8 @@
 /**
- *      Config object for `Commands_Feature`.
+ * Author: dkanus
- *      Copyright 2021-2022 Anton Tarasenko
+ * Home repo: https://www.insultplayers.ru/git/AcediaFramework/AcediaCore
+ * License: GPL
+ * Copyright 2021-2023 Anton Tarasenko
  *------------------------------------------------------------------------------
  * This file is part of Acedia.
  *
@@ -24,59 +26,33 @@ class Commands extends FeatureConfig
 var public config bool useChatInput;
 var public config bool useMutateInput;
 var public config string chatCommandPrefix;
-var public config array<string> allowedPlayers;
 
-protected function HashTable ToData()
+protected function HashTable ToData() {
-{
-    local int       i;
     local HashTable data;
-    local ArrayList playerList;
 
     data = __().collections.EmptyHashTable();
     data.SetBool(P("useChatInput"), useChatInput, true);
     data.SetBool(P("useMutateInput"), useMutateInput, true);
     data.SetString(P("chatCommandPrefix"), chatCommandPrefix);
-    playerList = _.collections.EmptyArrayList();
-    for (i = 0; i < allowedPlayers.length; i += 1) {
-        playerList.AddString(allowedPlayers[i]);
-    }
-    data.SetItem(P("allowedPlayers"), playerList);
-    playerList.FreeSelf();
     return data;
 }
 
-protected function FromData(HashTable source)
+protected function FromData(HashTable source) {
-{
-    local int       i;
-    local ArrayList playerList;
-
     if (source == none) {
         return;
     }
     useChatInput = source.GetBool(P("useChatInput"));
     useMutateInput = source.GetBool(P("useMutateInput"));
     chatCommandPrefix = source.GetString(P("chatCommandPrefix"), "!");
-    playerList          = source.GetArrayList(P("allowedPlayers"));
-    allowedPlayers.length = 0;
-    if (playerList == none) {
-        return;
-    }
-    for (i = 0; i < playerList.GetLength(); i += 1) {
-        allowedPlayers[allowedPlayers.length] = playerList.GetString(i);
-    }
-    playerList.FreeSelf();
 }
 
-protected function DefaultIt()
+protected function DefaultIt() {
-{
     useChatInput = true;
     useMutateInput = true;
     chatCommandPrefix = "!";
-    allowedPlayers.length   = 0;
 }
 
-defaultproperties
+defaultproperties {
-{
     configName = "AcediaSystem"
     useChatInput = true
     useMutateInput = true

sources/LevelAPI/Features/Commands/Commands_Feature.uc

@@ -1,9 +1,8 @@
 /**
- *      This feature provides a mechanism to define commands that automatically
+ * Author: dkanus
- *  parse their arguments into standard Acedia collection. It also allows to
+ * Home repo: https://www.insultplayers.ru/git/AcediaFramework/AcediaCore
- *  manage them (and specify limitation on how they can be called) in a
+ * License: GPL
- *  centralized manner.
+ * Copyright 2023 Anton Tarasenko
- *      Copyright 2021-2023 Anton Tarasenko
  *------------------------------------------------------------------------------
  * This file is part of Acedia.
  *
@@ -22,90 +21,61 @@
  */
 class Commands_Feature extends Feature;
 
-/**
+//! This feature manages commands that automatically parse their arguments into standard Acedia
- *  # `Commands_Feature`
+//! collections.
- *
+//!
- *      This feature provides a mechanism to define commands that automatically
+//! # Implementation
- *  parse their arguments into standard Acedia collection. It also allows to
+//!
- *  manage them (and specify limitation on how they can be called) in a
+//!     Implementation is simple: calling a method `RegisterCommand()` adds
- *  centralized manner.
+//! command into two caches `registeredCommands` for obtaining registered
- *      Support command input from chat and "mutate" command.
+//! commands by name and `groupedCommands` for obtaining arrays of commands by
- *
+//! their group name. These arrays are used for providing methods for fetching
- *  ## Usage
+//! arrays of commands and obtaining pre-allocated `Command` instances by their
- *
+//! name.
- *      Should be enabled like any other feature. Additionally support
+//!     Depending on settings, this feature also connects to corresponding
- *  `EmergencyEnable()` enabling method that bypasses regular settings to allow
+//! signals for catching "mutate"/chat input, then it checks user-specified name
- *  admins to start this feature while forcefully enabling "mutate" command
+//! for being an alias and picks correct command from `registeredCommands`.
- *  input method.
+//!     Emergency enabling this feature sets `emergencyEnabledMutate` flag that
- *      Available configuration:
+//! enforces connecting to the "mutate" input.
- *
+
- *      1. Whether to use command input from chat and what prefix is used to
+// Auxiliary struct for passing name of the command to call plus, optionally, additional
- *          denote a command (by default "!");
+// sub-command name.
- *      2. Whether to use command input from "mutate" command.
+//
- *
+// Normally sub-command name is parsed by the command itself, however command aliases can try to
- *      To add new commands into the system - get enabled instance of this
+// enforce one.
- *  feature and call its `RegisterCommand()` method to add your custom
+struct CommandCallPair {
- *  `Command` class. `RemoveCommand()` can also be used to de-register
+    var MutableText commandName;
- *  a command, if you need this for some reason.
+    //  In case it is enforced by an alias
- *
+    var MutableText subCommandName;
- * ## Implementation
+};
- *
- *      Implementation is simple: calling a method `RegisterCommand()` adds
- *  command into two caches `registeredCommands` for obtaining registered
- *  commands by name and `groupedCommands` for obtaining arrays of commands by
- *  their group name. These arrays are used for providing methods for fetching
- *  arrays of commands and obtaining pre-allocated `Command` instances by their
- *  name.
- *      Depending on settings, this feature also connects to corresponding
- *  signals for catching "mutate"/chat input, then it checks user-specified name
- *  for being an alias and picks correct command from `registeredCommands`.
- *      Emergency enabling this feature sets `emergencyEnabledMutate` flag that
- *  enforces connecting to the "mutate" input.
- */
 
 // Delimiters that always separate command name from it's parameters
 var private array<Text> commandDelimiters;
 // Registered commands, recorded as (<command_name>, <command_instance>) pairs.
 // Keys should be deallocated when their entry is removed.
 var private HashTable   registeredCommands;
-//  `HashTable` of "<command_group_name>" <-> `ArrayList` of commands pairs
+// `HashTable` of "<command_group_name>" <-> `ArrayList` of commands pairs to allow quick fetch of
-//  to allow quick fetch of commands belonging to a single group
+// commands belonging to a single group
 var private HashTable   groupedCommands;
 
-//  When this flag is set to true, mutate input becomes available
+// When this flag is set to true, mutate input becomes available despite `useMutateInput` flag to
-//  despite `useMutateInput` flag to allow to unlock server in case of an error
+// allow to unlock server in case of an error
 var private bool emergencyEnabledMutate;
 
-//  Setting this to `true` enables players to input commands right in the chat
+// Setting this to `true` enables players to input commands right in the chat by prepending them
-//  by prepending them with `chatCommandPrefix`.
+// with `chatCommandPrefix`.
 // Default is `true`.
 var private /*config*/ bool useChatInput;
-//  Setting this to `true` enables players to input commands with "mutate"
+// Setting this to `true` enables players to input commands with "mutate" console command.
-//  console command.
 // Default is `true`.
 var private /*config*/ bool useMutateInput;
 // Chat messages, prepended by this prefix will be treated as commands.
 // Default is "!". Empty values are also treated as "!".
 var private /*config*/ Text chatCommandPrefix;
-//  List of steam IDs of players allowed to use commands.
-//  Temporary measure until a better solution is finished.
-var private /*config*/ array<string> allowedPlayers;
-
-//      Contains name of the command to call plus, optionally,
-//  additional sub-command name.
-//      Normally sub-command name is parsed by the command itself, however
-//  command aliases can try to enforce one.
-struct CommandCallPair
-{
-    var MutableText commandName;
-    //  In case it is enforced by an alias
-    var MutableText subCommandName;
-};
 
 var LoggerAPI.Definition errCommandDuplicate;
 
-protected function OnEnabled()
+protected function OnEnabled() {
-{
     registeredCommands = _.collections.EmptyHashTable();
     groupedCommands = _.collections.EmptyHashTable();
     RegisterCommand(class'ACommandHelp');
@@ -116,6 +86,7 @@ protected function OnEnabled()
     // Player array (possibly JSON array)
     commandDelimiters[2] = _.text.FromString("[");
     // Negation of the selector
+    // NOT the same thing as default command prefix in chat
     commandDelimiters[3] = _.text.FromString("!");
     if (useChatInput) {
         _.chat.OnMessage(self).connect = HandleCommands;
@@ -131,8 +102,7 @@ protected function OnEnabled()
     }
 }
 
-protected function OnDisabled()
+protected function OnDisabled() {
-{
     if (useChatInput) {
         _.chat.OnMessage(self).Disconnect();
     }
@@ -141,10 +111,7 @@ protected function OnDisabled()
     }
     useChatInput = false;
     useMutateInput = false;
-    _.memory.Free(registeredCommands);
+    _.memory.Free3(registeredCommands, groupedCommands, chatCommandPrefix);
-    _.memory.Free(groupedCommands);
-    _.memory.Free(chatCommandPrefix);
-    _.memory.FreeMany(commandDelimiters);
     registeredCommands = none;
     groupedCommands = none;
     chatCommandPrefix = none;
@@ -161,50 +128,131 @@ protected function SwapConfig(FeatureConfig config)
     }
     _.memory.Free(chatCommandPrefix);
     chatCommandPrefix = _.text.FromString(newConfig.chatCommandPrefix);
-    allowedPlayers = newConfig.allowedPlayers;
     useChatInput = newConfig.useChatInput;
     useMutateInput = newConfig.useMutateInput;
 }
 
-/**
+// Parses command's name into `CommandCallPair` - sub-command is filled in case
- *  `Command_Feature` is a critical command to have running on your server and,
+// specified name is an alias with specified sub-command name.
- *  if disabled by accident, there will be no way of starting it again without
+private final function CommandCallPair ParseCommandCallPairWith(Parser parser) {
- *  restarting the level or even editing configs.
+    local Text resolvedValue;
- *
+    local MutableText userSpecifiedName;
- *  This method allows to enable it along with "mutate" input in case something
+    local CommandCallPair result;
- *  goes wrong.
+    local Text.Character dotCharacter;
- */
+
-public final static function EmergencyEnable()
+    if (parser == none) return result;
-{
+    if (!parser.Ok())   return result;
+
+    parser.MUntilMany(userSpecifiedName, commandDelimiters, true, true);
+    resolvedValue = _.alias.ResolveCommand(userSpecifiedName);
+    //  This isn't an alias
+    if (resolvedValue == none) {
+        result.commandName = userSpecifiedName;
+        return result;
+    }
+    //  It is an alias - parse it
+    dotCharacter = _.text.GetCharacter(".");
+    resolvedValue.Parse()
+        .MUntil(result.commandName, dotCharacter)
+        .MatchS(".")
+        .MUntil(result.subCommandName, dotCharacter)
+        .FreeSelf();
+    if (result.subCommandName.IsEmpty()) {
+        result.subCommandName.FreeSelf();
+        result.subCommandName = none;
+    }
+    resolvedValue.FreeSelf();
+    return result;
+}
+
+private function bool HandleCommands(EPlayer sender, MutableText message, bool teamMessage) {
+    local Parser parser;
+
+    //  We are only interested in messages that start with `chatCommandPrefix`
+    parser = _.text.Parse(message);
+    if (!parser.Match(chatCommandPrefix).Ok()) {
+        parser.FreeSelf();
+        return true;
+    }
+    //  Pass input to command feature
+    HandleInputWith(parser, sender);
+    parser.FreeSelf();
+    return false;
+}
+
+private function HandleMutate(string command, PlayerController sendingPlayer) {
+    local Parser parser;
+    local EPlayer sender;
+
+    //  A lot of other mutators use these commands
+    if (command ~= "help")      return;
+    if (command ~= "version")   return;
+    if (command ~= "status")    return;
+    if (command ~= "credits")   return;
+
+    parser = _.text.ParseString(command);
+    sender = _.players.FromController(sendingPlayer);
+    HandleInputWith(parser, sender);
+    sender.FreeSelf();
+    parser.FreeSelf();
+}
+
+private final function RemoveClassFromGroup(class<Command> commandClass, BaseText commandGroup) {
+    local int i;
+    local ArrayList groupArray;
+    local Command nextCommand;
+
+    groupArray = groupedCommands.GetArrayList(commandGroup);
+    if (groupArray == none) {
+        return;
+    }
+    while (i < groupArray.GetLength()) {
+        nextCommand = Command(groupArray.GetItem(i));
+        if (nextCommand != none && nextCommand.class == commandClass) {
+            groupArray.RemoveIndex(i);
+        } else {
+            i += 1;
+        }
+        _.memory.Free(nextCommand);
+    }
+    if (groupArray.GetLength() == 0) {
+        groupedCommands.RemoveItem(commandGroup);
+    }
+    _.memory.Free(groupArray);
+}
+
+/// This method allows to forcefully enable `Command_Feature` along with "mutate" input in case
+/// something goes wrong.
+///
+/// `Command_Feature` is a critical command to have running on your server and,
+/// if disabled by accident, there will be no way of starting it again without
+/// restarting the level or even editing configs.
+public final static function EmergencyEnable() {
+    local bool noWayToInputCommands;
     local Text autoConfig;
     local Commands_Feature feature;
 
-    if (!IsEnabled())
+    if (!IsEnabled()) {
-    {
         autoConfig = GetAutoEnabledConfig();
         EnableMe(autoConfig);
         __().memory.Free(autoConfig);
     }
     feature = Commands_Feature(GetEnabledInstance());
-    if (    !feature.emergencyEnabledMutate
+    noWayToInputCommands = !feature.emergencyEnabledMutate
-        &&  !feature.IsUsingMutateInput() && !feature.IsUsingChatInput())
+        &&!feature.IsUsingMutateInput()
-    {
+        && !feature.IsUsingChatInput();
+    if (noWayToInputCommands) {
         default.emergencyEnabledMutate = true;
         feature.emergencyEnabledMutate = true;
         __server().unreal.mutator.OnMutate(feature).connect = HandleMutate;
     }
 }
 
-/**
+/// Checks if `Commands_Feature` currently uses chat as input.
- *  Checks if `Commands_Feature` currently uses chat as input.
+///
- *  If `Commands_Feature` is not enabled, then it does not use anything
+/// If `Commands_Feature` is not enabled, then it does not use anything
- *  as input.
+/// as input.
- *
+public final static function bool IsUsingChatInput() {
- *  @return `true` if `Commands_Feature` is currently enabled and is using chat
- *      as input and `false` otherwise.
- */
-public final static function bool IsUsingChatInput()
-{
     local Commands_Feature instance;
 
     instance = Commands_Feature(GetEnabledInstance());
@@ -214,16 +262,11 @@ public final static function bool IsUsingChatInput()
     return false;
 }
 
-/**
+/// Checks if `Commands_Feature` currently uses mutate command as input.
- *  Checks if `Commands_Feature` currently uses mutate command as input.
+///
- *  If `Commands_Feature` is not enabled, then it does not use anything
+/// If `Commands_Feature` is not enabled, then it does not use anything
- *  as input.
+/// as input.
- *
+public final static function bool IsUsingMutateInput() {
- *  @return `true` if `Commands_Feature` is currently enabled and is using
- *      mutate command as input and `false` otherwise.
- */
-public final static function bool IsUsingMutateInput()
-{
     local Commands_Feature instance;
 
     instance = Commands_Feature(GetEnabledInstance());
@@ -233,15 +276,10 @@ public final static function bool IsUsingMutateInput()
     return false;
 }
 
-/**
+/// Returns prefix that will indicate that chat message is intended to be a command. By default "!".
- *  Returns prefix that will indicate that chat message is intended to be
+///
- *  a command. By default "!".
+/// If `Commands_Feature` is disabled, always returns `none`.
- *
+public final static function Text GetChatPrefix() {
- *  @return Prefix that indicates that chat message is intended to be a command.
- *      If `Commands_Feature` is disabled, always returns `false`.
- */
-public final static function Text GetChatPrefix()
-{
     local Commands_Feature instance;
 
     instance = Commands_Feature(GetEnabledInstance());
@@ -251,31 +289,29 @@ public final static function Text GetChatPrefix()
     return none;
 }
 
-/**
+/// Registers given command class, making it available.
- *  Registers given command class, making it available for usage.
+///
- *
+/// # Errors
- *  If `commandClass` provides command with a name that is already taken
+///
- *  (comparison is case-insensitive) by a different command - a warning will be
+/// Returns `true` if command was successfully registered and `false` otherwise`.
- *  logged and newly passed `commandClass` discarded.
+///
- *
+/// If `commandClass` provides command with a name that is already taken
- *  @param  commandClass    New command class to register.
+/// (comparison is case-insensitive) by a different command - a warning will be
- */
+/// logged and newly passed `commandClass` discarded.
-public final function RegisterCommand(class<Command> commandClass)
+public final function bool RegisterCommand(class<Command> commandClass) {
-{
     local Text commandName, groupName;
     local ArrayList groupArray;
     local Command newCommandInstance, existingCommandInstance;
 
-    if (commandClass == none)       return;
+    if (commandClass == none)       return false;
-    if (registeredCommands == none) return;
+    if (registeredCommands == none) return false;
 
     newCommandInstance = Command(_.memory.Allocate(commandClass, true));
     commandName = newCommandInstance.GetName();
     groupName = newCommandInstance.GetGroupName();
     //  Check for duplicates and report them
     existingCommandInstance = Command(registeredCommands.GetItem(commandName));
-    if (existingCommandInstance != none)
+    if (existingCommandInstance != none) {
-    {
         _.logger.Auto(errCommandDuplicate)
             .ArgClass(existingCommandInstance.class)
             .Arg(commandName)
@@ -283,7 +319,7 @@ public final function RegisterCommand(class<Command> commandClass)
         _.memory.Free(groupName);
         _.memory.Free(newCommandInstance);
         _.memory.Free(existingCommandInstance);
-        return;
+        return false;
     }
     //  Otherwise record new command
     //  `commandName` used as a key, do not deallocate it
@@ -295,24 +331,16 @@ public final function RegisterCommand(class<Command> commandClass)
     }
     groupArray.AddItem(newCommandInstance);
     groupedCommands.SetItem(groupName, groupArray);
-    _.memory.Free(groupArray);
+    _.memory.Free4(groupArray, groupName, commandName, newCommandInstance);
-    _.memory.Free(groupName);
+    return true;
-    _.memory.Free(commandName);
-    _.memory.Free(newCommandInstance);
 }
 
-/**
+/// Removes command of given class from the list of registered commands.
- *  Removes command of class `commandClass` from the list of
+///
- *  registered commands.
+/// Removing once registered commands is not an action that is expected to be performed under normal
- *
+/// circumstances and it is not efficient.
- *  WARNING: removing once registered commands is not an action that is expected
+/// It is linear on the current amount of commands.
- *  to be performed under normal circumstances and it is not efficient.
+public final function RemoveCommand(class<Command> commandClass) {
- *  It is linear on the current amount of commands.
- *
- *  @param  commandClass    Class of command to remove from being registered.
- */
-public final function RemoveCommand(class<Command> commandClass)
-{
     local int i;
     local CollectionIterator iter;
     local Command nextCommand;
@@ -323,15 +351,11 @@ public final function RemoveCommand(class<Command> commandClass)
     if (commandClass == none)       return;
     if (registeredCommands == none) return;
 
-    for (iter = registeredCommands.Iterate(); !iter.HasFinished(); iter.Next())
+    for (iter = registeredCommands.Iterate(); !iter.HasFinished(); iter.Next()) {
-    {
         nextCommand     = Command(iter.Get());
         nextCommandName = Text(iter.GetKey());
-        if (    nextCommand == none || nextCommandName == none
+        if (nextCommand == none || nextCommandName == none || nextCommand.class != commandClass) {
-            ||  nextCommand.class != commandClass)
+            _.memory.Free2(nextCommand, nextCommandName);
-        {
-            _.memory.Free(nextCommand);
-            _.memory.Free(nextCommandName);
             continue;
         }
         keysToRemove[keysToRemove.length] = nextCommandName;
@@ -339,57 +363,22 @@ public final function RemoveCommand(class<Command> commandClass)
         _.memory.Free(nextCommand);
     }
     iter.FreeSelf();
-    for (i = 0; i < keysToRemove.length; i += 1)
+    for (i = 0; i < keysToRemove.length; i += 1) {
-    {
         registeredCommands.RemoveItem(keysToRemove[i]);
         _.memory.Free(keysToRemove[i]);
     }
-
     for (i = 0; i < commandGroup.length; i += 1) {
         RemoveClassFromGroup(commandClass, commandGroup[i]);
     }
     _.memory.FreeMany(commandGroup);
 }
 
-private final function RemoveClassFromGroup(
+/// Returns command based on a given name.
-    class<Command>  commandClass,
+///
-    BaseText        commandGroup)
+/// Name of the registered `Command` to return is case-insensitive.
-{
+///
-    local int       i;
+/// If no command with such name was registered - returns `none`.
-    local ArrayList groupArray;
+public final function Command GetCommand(BaseText commandName) {
-    local Command   nextCommand;
-
-    groupArray = groupedCommands.GetArrayList(commandGroup);
-    if (groupArray == none) {
-        return;
-    }
-    while (i < groupArray.GetLength())
-    {
-        nextCommand = Command(groupArray.GetItem(i));
-        if (nextCommand != none && nextCommand.class == commandClass) {
-            groupArray.RemoveIndex(i);
-        }
-        else {
-            i += 1;
-        }
-        _.memory.Free(nextCommand);
-    }
-    if (groupArray.GetLength() == 0) {
-        groupedCommands.RemoveItem(commandGroup);
-    }
-    _.memory.Free(groupArray);
-}
-
-/**
- *  Returns command based on a given name.
- *
- *  @param  commandName Name of the registered `Command` to return.
- *      Case-insensitive.
- *  @return Command, registered with a given name `commandName`.
- *      If no command with such name was registered - returns `none`.
- */
-public final function Command GetCommand(BaseText commandName)
-{
     local Text      commandNameLowerCase;
     local Command   commandInstance;
 
@@ -402,13 +391,8 @@ public final function Command GetCommand(BaseText commandName)
     return commandInstance;
 }
 
-/**
+/// Returns array of names of all available commands.
- *  Returns array of names of all available commands.
+public final function array<Text> GetCommandNames() {
- *
- *  @return Array of names of all available (registered) commands.
- */
-public final function array<Text> GetCommandNames()
-{
     local array<Text> emptyResult;
 
     if (registeredCommands != none) {
@@ -417,15 +401,8 @@ public final function array<Text> GetCommandNames()
     return emptyResult;
 }
 
-/**
+/// Returns array of names of all available commands belonging to the group [`groupName`].
- *  Returns array of names of all available commands belonging to the group
+public final function array<Text> GetCommandNamesInGroup(BaseText groupName) {
- *      `groupName`.
- *
- *  @return Array of names of all available (registered) commands, belonging to
- *      the group `groupName`.
- */
-public final function array<Text> GetCommandNamesInGroup(BaseText groupName)
-{
     local int i;
     local ArrayList groupArray;
     local Command nextCommand;
@@ -435,8 +412,7 @@ public final function array<Text> GetCommandNamesInGroup(BaseText groupName)
     groupArray = groupedCommands.GetArrayList(groupName);
     if (groupArray == none)         return result;
 
-    for (i = 0; i < groupArray.GetLength(); i += 1)
+    for (i = 0; i < groupArray.GetLength(); i += 1) {
-    {
         nextCommand = Command(groupArray.GetItem(i));
         if (nextCommand != none) {
             result[result.length] = nextCommand.GetName();
@@ -446,13 +422,8 @@ public final function array<Text> GetCommandNamesInGroup(BaseText groupName)
     return result;
 }
 
-/**
+/// Returns all available command groups' names.
- *  Returns all available command groups' names.
+public final function array<Text> GetGroupsNames() {
- *
- *  @return Array of all available command groups' names.
- */
-public final function array<Text> GetGroupsNames()
-{
     local array<Text> emptyResult;
 
     if (groupedCommands != none) {
@@ -461,158 +432,75 @@ public final function array<Text> GetGroupsNames()
     return emptyResult;
 }
 
-/**
+/// Executes command based on the input.
- *  Handles user input: finds appropriate command and passes the rest of
+///
- *  the arguments to it for further processing.
+/// Takes [`commandLine`] as input with command's call, finds appropriate registered command
- *
+/// instance and executes it with parameters specified in the [`commandLine`].
- *  @param  input           Test that contains user's command input.
+///
- *  @param  callerPlayer    Player that caused this command call.
+/// [`callerPlayer`] has to be specified and represents instigator of this command that will receive
- */
+/// appropriate result/error messages.
-public final function HandleInput(BaseText input, EPlayer callerPlayer)
+///
-{
+/// Returns `true` iff command was successfully executed.
+///
+/// # Errors
+///
+/// Doesn't log any errors, but can complain about errors in name or parameters to
+/// the [`callerPlayer`]
+public final function bool HandleInput(BaseText input, EPlayer callerPlayer) {
+    local bool result;
     local Parser wrapper;
 
     if (input == none) {
-        return;
+        return false;
     }
     wrapper = input.Parse();
-    HandleInputWith(wrapper, callerPlayer);
+    result = HandleInputWith(wrapper, callerPlayer);
     wrapper.FreeSelf();
+    return result;
 }
 
-/**
+/// Executes command based on the input.
- *  Handles user input: finds appropriate command and passes the rest of
+///
- *  the arguments to it for further processing.
+/// Takes [`commandLine`] as input with command's call, finds appropriate registered command
- *
+/// instance and executes it with parameters specified in the [`commandLine`].
- *  @param  parser          Parser filled with user input that is expected to
+///
- *      contain command's name and it's parameters.
+/// [`callerPlayer`] has to be specified and represents instigator of this command that will receive
- *  @param  callerPlayer    Player that caused this command call.
+/// appropriate result/error messages.
- */
+///
-public final function HandleInputWith(Parser parser, EPlayer callerPlayer)
+/// Returns `true` iff command was successfully executed.
-{
+///
-    local int               i;
+/// # Errors
-    local bool              foundID;
+///
-    local string            steamID;
+/// Doesn't log any errors, but can complain about errors in name or parameters to
-    local PlayerController  controller;
+/// the [`callerPlayer`]
+public final function bool HandleInputWith(Parser parser, EPlayer callerPlayer) {
+    local bool errorOccured;
     local Command commandInstance;
     local Command.CallData callData;
     local CommandCallPair callPair;
 
-    if (parser == none)         return;
+    if (parser == none)         return false;
-    if (callerPlayer == none)   return;
+    if (callerPlayer == none)   return false;
-    if (!parser.Ok())           return;
+    if (!parser.Ok())           return false;
-    controller = callerPlayer.GetController();
-    if (controller == none)     return;
 
-    steamID = controller.GetPlayerIDHash();
-    for (i = 0; i < allowedPlayers.length; i += 1)
-    {
-        if (allowedPlayers[i] == steamID)
-        {
-            foundID = true;
-            break;
-        }
-    }
-    if (!foundID) {
-        return;
-    }
     callPair = ParseCommandCallPairWith(parser);
     commandInstance = GetCommand(callPair.commandName);
-    if (    commandInstance == none
+    if (commandInstance == none && callerPlayer != none && callerPlayer.IsExistent()) {
-        &&  callerPlayer != none && callerPlayer.IsExistent())
-    {
         callerPlayer
             .BorrowConsole()
             .Flush()
             .Say(F("{$TextFailure Command not found!}"));
     }
-    if (parser.Ok() && commandInstance != none)
+    if (parser.Ok() && commandInstance != none) {
-    {
+        callData = commandInstance.ParseInputWith(parser, callerPlayer, callPair.subCommandName);
-        callData = commandInstance
+        errorOccured = commandInstance.Execute(callData, callerPlayer);
-            .ParseInputWith(parser, callerPlayer, callPair.subCommandName);
-        commandInstance.Execute(callData, callerPlayer);
         commandInstance.DeallocateCallData(callData);
     }
-    _.memory.Free(callPair.commandName);
+    _.memory.Free2(callPair.commandName, callPair.subCommandName);
-    _.memory.Free(callPair.subCommandName);
+    return errorOccured;
-}
-
-//  Parses command's name into `CommandCallPair` - sub-command is filled in case
-//  specified name is an alias with specified sub-command name.
-private final function CommandCallPair ParseCommandCallPairWith(Parser parser)
-{
-    local Text              resolvedValue;
-    local MutableText       userSpecifiedName;
-    local CommandCallPair   result;
-    local Text.Character    dotCharacter;
-
-    if (parser == none) return result;
-    if (!parser.Ok())   return result;
-
-    parser.MUntilMany(userSpecifiedName, commandDelimiters, true, true);
-    resolvedValue = _.alias.ResolveCommand(userSpecifiedName);
-    //  This isn't an alias
-    if (resolvedValue == none)
-    {
-        result.commandName = userSpecifiedName;
-        return result;
-    }
-    //  It is an alias - parse it
-    dotCharacter = _.text.GetCharacter(".");
-    resolvedValue.Parse()
-        .MUntil(result.commandName, dotCharacter)
-        .MatchS(".")
-        .MUntil(result.subCommandName, dotCharacter)
-        .FreeSelf();
-    if (result.subCommandName.IsEmpty())
-    {
-        result.subCommandName.FreeSelf();
-        result.subCommandName = none;
-    }
-    resolvedValue.FreeSelf();
-    return result;
 }
 
-private function bool HandleCommands(
+defaultproperties {
-    EPlayer     sender,
-    MutableText message,
-    bool        teamMessage)
-{
-    local Parser parser;
-
-    //  We are only interested in messages that start with `chatCommandPrefix`
-    parser = _.text.Parse(message);
-    if (!parser.Match(chatCommandPrefix).Ok())
-    {
-        parser.FreeSelf();
-        return true;
-    }
-    //  Pass input to command feature
-    HandleInputWith(parser, sender);
-    parser.FreeSelf();
-    return false;
-}
-
-private function HandleMutate(string command, PlayerController sendingPlayer)
-{
-    local Parser    parser;
-    local EPlayer   sender;
-
-    //  A lot of other mutators use these commands
-    if (command ~= "help")      return;
-    if (command ~= "version")   return;
-    if (command ~= "status")    return;
-    if (command ~= "credits")   return;
-
-    parser = _.text.ParseString(command);
-    sender = _.players.FromController(sendingPlayer);
-    HandleInputWith(parser, sender);
-    sender.FreeSelf();
-    parser.FreeSelf();
-}
-
-defaultproperties
-{
     configClass = class'Commands'
     errCommandDuplicate = (l=LOG_Error,m="Command `%1` is already registered with name '%2'. Command `%3` with the same name will be ignored.")
 }