Starting a language after Beautiful Racket

[Pratyush Das]

I am absolutely new to both Racket and language implementation.

I read through some portions of Beautiful Racket and the racket guide before trying to implement a language on my own and this is what I understand - 

I created a main.rkt which would be the boot module in my source directory, following the Beautiful Racket master recipe.

Every language should define and provide a read-syntax function. 

To make the new language read the source file, read-syntax must be defined something like - 

(define (read-syntax path port)
...)

Like in Beautiful Racket's wires language implementation, I want to read the source file line by line and wrap it in a macro. 

Beautiful Racket does it like this - 

  (define (read-syntax path port)
    (define wire-datums
      (for/list ([wire-str (in-lines port)])
        (format-datum '(wire ~a) wire-str)))

But this assumes that the br lang is being used(I think because of the format-datum syntax). How do I implement this without using the br lang?

Also, am I wrong in any of my assumptions so far?

[Pratyush Das]

A followup question - 

But this assumes that the br lang is being used(I think because of the format-datum syntax). How do I implement this without using the br lang?

...

(define src-lines (port->lines port))
  (define src-datums (format-datums '(handle ~a) src-lines))

...

Is it possible to use modules to just get the format-datums from the br language? 

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Pratyush Das(Reik)

[Matthew Butterick]

Three options:

1) Implement your language in `#lang br` now (and optionally convert to `racket/base` later) [1]

2) Import the `br/datum` module into a `#lang racket/base` program to get `format-datum` [2]

3) Reimplement `format-datum` your own way. You can see the underlying code by right-clicking on `format-datum` in DrRacket and selecting "Open Defining File".

[1] https://beautifulracket.com/appendix/from-br-to-racket-base.html

[2] https://docs.racket-lang.org/br/index.html?q=br%2Fdatums#%28mod-path._br%2Fdatum%29

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[Pratyush Das]

Thanks!

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Pratyush Das(Reik)