A MUD server written in Kotlin, inspired by Pavel Curtis's MOO server.

Like MOO, Yegg aspires to be a generalized server for creating MUD games, rather than implementing any particular MUD style or rules. It incorporates a compiler for its internal scripting language (YeggCode), a single-threaded task scheduler, and an extensible command parser. The actual structure and behavior of the MUD world are defined in YeggCode by the programmer(s).

If you're familiar with MOO, Yegg differs in a few key aspects:

• YeggCode is much more flexible than MOOcode. It includes flexible formatting, a C-like block structure, anonymous functions, maps, and other modern-ish features.
• Yegg worlds have two kinds of entities: Objects, and Traits. Traits serve the function of fertile parent objects in MOO; they hold verbs and properties defining behavior, but they do not actually 'exist' in the world as Objects.
• Yegg objects support multi-inheritance; an Object can have multiple Traits from which it gets behavior, and any Trait can have multiple parents as well.
• Yegg code is not interpreted per se, but is compiled to an intermediate stack-machine language for speed. Unlike MOO, the original source code text is kept.