Callum's Lisp

A Lisp interpreter designed to be run in the browser using WASM.

Usage

You can perform simple numerical operations using +, -, *, and /:

scheme (+ 1 2) => 3 (/ 5 2) => 2.5 (- 2) => -2 (/ 5) => 0.2

You can define constants using def:

scheme (def x 3) => 3 x => 3

You can create functions using lambda:

scheme (lambda (x) (+ x 1)) => <function> (def add1 (lambda (x) (+ x 1))) => <unspecified> (add1 3) => 4

List of all builtin functions and special forms

Special forms

• def: creates a constant in the current environment
• lambda or λ: creates a function

Builtin functions

• +,-,*,/: simple arithmetic operators
• exit: exits with code 0 or code provided by argument
• eval: evaluate the expression passed as an argument
• use: evaluate all expressions contained in a file in the current environment
• putstr: print a string to stdout
• readline: read a line from stdin
• equal?: check if any amount of values are equal
• >, >=, <, <=: number comparison operators

Goals

• [ ] IO (print, readline, etc.)
• [ ] Macros
• [ ] Tail call elimination
• [ ] Multi-precision numbers
• [ ] Strings
• [ ] Vectors
• [ ] Structs/enums/union types