Parser's Working

Ok, got the parser rewritten using the new datatypes.

If you're bored, and would like to know how small a lexer and parser engine can be, take a look at tests/t_parse.scm.

Note that both the lexer and the parser are bare-bones engines that are using tables generated by other tools written in Python. In this case, a DFA lexer written by me, and an LR(1) parser generator written by Jason Evans.