Brigadier

"I'm so proud of that name! Brigadier is the name of the command engine that Minecraft uses."

- Dinnerbone

Brigadier is a command parser and dispatcher, designed and developed for, mainly maintained by Dinnerbone. It is the first library used by Java Edition that Mojang has released under an open-source license.

Usage
Brigadier is used for parsing and executing string commands.

Features

 * Define command nodes with argument or literal branches
 * All the commands available in Java Edition are actually the literal branches available for the root command nodes instead of the actual executed commands.
 * Modify/fork command source in command contexts
 * may modify the command source to be multiple when multiple entities are selected
 * Active inspection on command parsing
 * Listing all possible commands from current command node
 * Handle command result real-time on execution success/failure
 * can store the command result to block/entity NBT data or scoreboard
 * Recursive command node redirection
 * redirects to the root node of the vanilla command dispatcher

Limitations
Brigadier is not reliable as the hack-mastering-like library (like Java source code modifications for cheats-only usage or hard-coded command library). Brigadier has some limitations for some commands like, resulting in execution failure, but the further future command libraries other than Brigadier will be worked further functionally.

Due to the bug in Brigadier, command suggestions reports "Incorrect argument" with a trailing whitespace without suggestions (MC-165562), and command syntax checks whitespaces, etc. In fact, the leading whitespaces, extraneous slashes, and whitespaces between commands (e.g.,  ,  ) should also be ignored before command names.

In some commands (mostly, ), Brigadier still use 32-bit IEEE floating-point for certain arguments which can cause the great numeric imprecision and range limitations.