TwitchMonkey

A learning aid for engines. Very small engine for a very small language. Implements the following:

Grammar

Script:
   Expression

Expression:
   A Expression
   B Expression
   C Expression
   D Expression

A :
  "a"

B :
  "b"

C :
  "c"

D :
  "d"

A : "a"

Execution Step: Print "goose"

B : "b"

Execution Step: Print "duck"

C : "c"

Execution Step: Print "swan"

D : "d"

Execution Step: Print "finch"