Dict Command Registration

Register your command with a python dict.

MCDReforged implements a command system like brigadier, but it is too difficult to use and not intuitive enough. When the tree becomes large, maintainability and readability become extremely poor. Then you have to split it into multiple child nodes, but when the child nodes become large you need to keep splitting them and end up in an infinite loop.

This plugin provides an API that allows you to register MCDR command trees with python dict, which is also a tree structure - a more intuitive structure, isn't it? It takes the python dict you provide, generates the MCDR Command Node, then register it. You do not have to bother with the huge code tree, just maintain your dict tree.

Incidentally, it can register the help message for you.

Quick Start

Let's register this example command in MCDR doc:

Literal('!!email'). \
then(Literal('list')). \
then(Literal('remove'). \
    then(Integer('email_id'))
). \
then(Literal('send'). \
    then(Text('player'). \
        then(GreedyText('message'))
    )
)

Write the command dict and call register method.

from dict_command_registration import NodeType, register

command = {
    "name": "!!email",
    "children": [
        {
            "name": "list"
        },
        {
            "name": "remove",
            "children": [
                {
                    "name": "email_id",
                    "type": NodeType.INTEGER
                }
            ]
        },
        {
            "name": "send",
            "children": [
                {
                    "name": "player",
                    "type": NodeType.TEXT,
                    "children": [
                        {
                            "name": "email_id",
                            "type": NodeType.GREEDY_TEXT
                        }
                    ]
                }
            ]
        }
    ]
}

def on_load(server, prev_module):
    register(server, command)

All done!

If you want register help message together:

register(server, command, "Email command")

Concepts

Node

In this plugin, Node means a dict which contains data of a MCDR command node.

See also: Node

API Reference

Exceptions

MissingRequiredAttribute

Raise when missing required attribute in Node.

NodeType

MCDR Origin Command Nodes.

Key	Class
LITERAL	Literal
NUMBER	Number
INTEGER	Integer
FLOAT	Float
TEXT	Text
QUOTABLE_TEXT	QuotableText
GREEDY_TEXT	GreedyText
BOOLEAN	Boolean
ENUMERATION	Enumeration

Node (class)

Parse a Node (dict), and can cast to MCDR node.

init(data: Dict[str, Any])

Accept a dict.

literal: Union[str, Iterable[str]]

Get literal string or Iterable.

to_mcdr_node() -> Union[Literal, ArgumentNode]

To MCDR Node.

Node (dict)

name

Name of the node.

• Type: str

This value is required.

node

MCDR node if you want use exist node.

• Type: Literal or ArgumentNode

literal

Text of a literal node.

• Type: str or Iterable[str]
• Default: name value

You have to set this value if you want use multiple literals (Iterable).

type

Type of this node.

• Type: NodeType or ArgumentNode
• Default: NodeType.LITERAL

enumeration

Value of Enumeration node.

• Type: Dict[str, Any]
• Default: []

args

Args to create Node if using customize node.

• Type: List[Any]
• Default: []

kwargs

Kwargs to create Node if using customize node.

• Type: Dict[str, Any]
• Default: {}

runs

Set the callback function of this node.

• Type: Callable

See also: AbstractNode.runs().

requires

Set the requirement tester callback of the node.

• Type: Union[Callable, List[Callable]]

See also: AbstractNode.requires().

redirects

Redirect all further child nodes command parsing to another given node.

• Type: AbstractNode

See also: AbstractNode.redirects().

suggests

Set the provider for command suggestions of this node.

• Type: Callable

See also: AbstractNode.suggests().

on_error

When a command error occurs, the given will invoke the given handler to handle with the error.

• Type: Dict[str, Any]

See also: AbstractNode.on_error().

Accept three keys in the dict, which are three arguments listed in the doc.

on_child_error

Similar to on_error(), but it gets triggered only when the node receives a command error from one of the node’s direct or indirect child.

• Type: Dict[str, Any]

See also: AbstractNode.on_child_error().

Accept three keys in the dict, which are three arguments listed in the doc.

children

Children of this node.

• Type: List[Dict[str, Any]]
• Default: []

You can put node in the array to add a child node.

register

Method to register command.

Params:

• PluginServerInterface server: the PluginServerInterface instance of your plugin, to ensure that this command is registered by your plugin.
• dict command: Command, please find more information in the document.
• str help_message: Provide a string value if you want register
• int help_message_permission: The minimum permission level to see this help message. See also in MCDReforged document.