package p5scm
Install
Dune Dependency
Authors
Maintainers
Sources
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README.md.html
A Scheme Implementation using Pa_schemer from Camlp5
This repository contains a scheme implementation based on pa_schemer.ml which is included as an extension of camlp5. This provides a scheme-like syntax for OCaml. The camlp5 documentation for the scheme extension provides the following comparison between OCaml and scheme syntax:
| OCaml | Scheme |
|---|---|
| let x = 42;; | (define x 42) |
| let f x = 0;; | (define (f x) 0) |
| let rec f x y = 0;; | (definerec (f x y) 0) |
| let x = 42 and y = 27 in x + y;; | (let ((x 42) (y 27)) (+ x y)) |
| let x = 42 in let y = 27 in x + y;; | (let* ((x 42) (y 27)) (+ x y)) |
| module M = struct ... end;; | (module M (struct ...)) |
| type 'a t = A of 'a * int | B | (type (t 'a) (sum (A 'a int) (B))) |
| fun x y -> x | (lambda (x y) x) |
| x; y; z | (begin x y z) |
| f x y | (f x y) |
| [1; 2; 3] | [1 2 3] |
| a, b, c | (values a b c) |
| match x with 'A'..'Z' -> "x" | (match x ((range 'A' 'Z') "x"))) |
| {x = y; z = t} | {(x y) (z t)} |
p5scm also provides the following:
| OCaml | Scheme |
|---|---|
| [|1; 2; 3|] | #(1 2 3) |
which is provided via a simple menhir parser that supports all of the syntax above.
Installation
As long as you have a current version of opam, installation is as simple as:
$ opam install p5scm
You can then use it to parse and emit OCaml bytecode that can then be used in your OCaml project:
$ p5scm file1.scm
You can also start an interpreter for p5scm:
$ p5sch-utop
which uses utop for code completion and many of the other benefits that it provides. Currently both the #require and #use directives of utop function in the interpreter/REPL (same syntax as utop however no terminating ;; required).
Only OCaml versions >= 4.12.0 are supported by the opam package. Instructions for adding support for older versions can be found (here).