zlisp running (sort of)

[duncan_bayne]

I've got zlisp (my simple Lisp implementation for the Amstrad CPC series) running.  At the moment it's not even vaguely usable: it parses simple atoms (strings, integers, and symbols) and prints them.  The parser can't handle lists, and there's no eval, so there's a lot of work to do

But I'm making progress, albeit slowly.

[fano]

Nice ! parsing is the first step 

[TFM]

Interesting project. You do write that lisp in C right?

[duncan_bayne]

Nice ! parsing is the first step 

Actually I did the cons cells & printing of same first, so I could hook up a rudimentary parser and see things running end to end.  E.g.:

https://github.com/duncan-bayne/zlisp/blob/master/tests/cons_cell_tests.c

[duncan_bayne]

Interesting project. You do write that lisp in C right?

Yes, except for a few bits of assembler to interface with the Amstrad firmware, e.g.:

https://github.com/duncan-bayne/zlisp/blob/master/src/amstext.s

I'm still puzzling about how to give easy access to the complete firmware through Lisp.  I was thinking maybe inline machine code could be a first, hacky, approach:

Code Select Expand

(eval-z80 (#x3e #x65 #xcd #x5a #xbb #c9))

Which is somewhat horrible but could actually work pretty well for simple fragments.  Stuff like cassette or disc I/O would be better served with a proper Lisp library however.

Decisions, decisions ...