Author: Kemal Eren (kemal@kemaleren.com)
LisPy is an implementation of a subset of the features of LISP 1.5, as outlined in John McCarthy's LISP 1.5 Programmer's Manual.
The following primitives are defined:
- T
- NIL
- CAR
- CDR
- CONS
- ATOM
- EQ
- NULL
- INT
- PLUS
- MINUS
- TIMES
- QUOTIENT
- REMAINDER
- LESS
- GREATER
- COND
- QUOTE
- DEFUN
- HELP
- QUIT
and various math symbols: + - % * / = < >
LisPy supports both interactive and batch modes.
- Python (tested with 2.6 and 2.7)
NB: LisPy is case-insensitive, and allows both dot and list notation (though they may not be mixed).
See demo.lsp for some simple examples.
In interactive mode, individual LISP commands may be entered into the REPL (read-eval-print loop).
Simply run ./interpreter.py to start an interactive
toplevel. LISP commands may be entered over multiple lines;
a command will not be evaluated until the parentheses
match.
Pressing "Control+c" abandons the current expression and starts a new line. Calling (help) gives some minimal help.
When finished, type (quit) or press "Control+d" to exit.
Run ./interpreter.py <input file>. All expressions in the
file will be read, evaluated, and printed in order to
standard output.