A tree based text adventure game engine, inspired by Infocom's Zork.
Dork is a toy project designed to explore n-ary trees. In Dork, every object is represented as a Node and, except for the World node, is contianed within another Node. As a Player moves from room to room, she is simply becoming a child of a new Room node. Similarly, as an Item is picked up by a Player, it is simply moved from the Room node (or, if it is conatined in box or cabinent, another Item node) onto the Player. Game conditions are held in a special Script node that checks for various conditions to unlock other areas of the game.
+---------------------------------------------+
| World |
+------+---------------+--------------+-------+
| | |
+------v------+ +------v------+ +-----v-------+
| Room | | Room | | Room |
+--+-------+--+ +---+---------+ +-------------+
| | |
+--v-+ +---v-+ +---v--+
|Item| |Item | |Player|
| | | | | |
+----+ +--+--+ +--+---+-----+
| | |
+--v--+ +--v---+ +---v--+
|Item | | Item | | Item |
| | | | | |
+-----+ +------+ +------+
The engine consists of a handful of classes in a single file. You can see a sample game script which creates a small world where the player needs to find all of the tools and ingredients to make and eat scrambled eggs.
And Rspec tests for the engine are here.