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The SMoL Language Family

This is the "smol" package for Racket.

SMoL is the Standard Model of Languages, a concept introduced in the third edition of PLAI.

Installation

Install this package using the Racket packet manager:

  • From DrRacket, go to File | Install Package, and enter the URL

    https://github.com/shriram/smol.git

  • At the command line, run

    raco pkg install https://github.com/shriram/smol.git

    Make sure your paths are set correctly so that you're installing the package for the right version!

Checking the Install

Once installed, you can test by going into DrRacket, creating a new tab (if necessary, go to the Language menu and choose "The Racket Language"). Then type

#lang smol/fun

(+ 1 2)

and run your program. You should see the output 3 in the REPL.

Documentation

You can read documentation in the Racket documentation for your local installation (not on the Racket Web site). In DrRacket, go to Help | Racket Documentation. This will open a Web browser window. In that window, you can either type smol or scroll down to look for “SMoL” on that page.

Updating

If you're asked to update your package, you can do it through

  • the DrRacket package manager: File | Package Manager, then click on the package, and click on Update

  • the command line: run

    raco pkg update https://github.com/shriram/smol.git

You can always find the current version of your package through

  • the DrRacket package manager: File | Package Manager, then look at the package

  • the command line: run

    raco pkg show smol

In either case, you should see a Checksum that looks something like 812c8bbd and so on. Compare that this begins the same way as the checksum right after "Latest commit" earlier on this page. That tells you that you have the most recent version of the package; otherwise, it needs updating. Specifically, the checksum tells you which version you currently have installed.

Running from the Command Line

You can run files normally using the racket binary.

If you want a REPL in a SMoL language, say smol/fun, use this command line:

racket -l smol/fun/semantics -i

(Replace fun with whatever other language you prefer.) This will create an (interactive) REPL in that language.