Lispi - A Lisp Interpreter
Luke Rindels, April 2019
Compile
In the same directory as Makefile, lispi.cc, lispi.h, and builtin.cc, run make to compile.
Run
./lispi to run the binary.
Use
Saving Output
All session output is saved in results.txt. This file will be overwritten if a new session is started.
Valid Expressions
| Construct | Syntax | Example |
|---|---|---|
| Variable Reference | variable | x -> 10 |
| Constant Literal | number or boolean | T -> T |
| Quotation | 'expression | '(+ 1 1) -> (+ 1 1) |
| Conditional | (if test consequence alternate) | (if (> 10 20) (+ 1 1) (+ 3 3)) -> 6 |
| Variable Definition | (define variable expression) | (define x 10) |
| Function Call | (function args ...) | (sqrt (+ 8 8)) -> 4 |
| Variable Assignment | (set! variable expression) | (set! x (+ 5 6)) |
| Function Definition | (defun function_name (variable ...) expression) | (defun double (x) (+ x x)) |
Predefined Operations
| Operation | Syntax | Example |
|---|---|---|
| + - * / | (+ value value) | (+ 1 1) -> 2 |
| car | car (list) | (car (1 2 3)) -> 1 |
| cdr | cdr (list) | (cdr ((1 2) 3)) -> (3) |
| cons | cons literal (list) | (cons '1 '(2 3 4)) -> (1 2 3 4) |
| sqrt | sqrt expression | (sqrt (+ 2 2)) -> 2 |
| pow | pow expression exponent | (pow -2 2) -> 4 |
| > < = != and or not | (> value value) | (< 2 3) -> T |