the authors of ibo found the base ideas of ibo in the much stronger http://www.djangoproject.com/. if you stumbled in ibo, do have a look at our documentation, but please consider checking django.
Pure Python implementation of GOLD Parser Engine.
GOLD Parser Engine is a LALR(1) parser with DFA tokenizer.
It uses compiled grammar table generated by GOLD Parser Builder (not included - available on http://www.devincook.com/goldparser)