You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
975 B
Racket
40 lines
975 B
Racket
#lang br/quicklang
|
|
(require brag/support)
|
|
|
|
(module+ reader
|
|
(provide read-syntax))
|
|
|
|
(define lex
|
|
(lexer
|
|
["#$" null]
|
|
["%" 'taco]
|
|
[any-char (lex input-port)]))
|
|
|
|
(define (tokenize ip)
|
|
(define toklets (for/list ([toklet (in-port lex ip)])
|
|
toklet))
|
|
(let loop ([toklets toklets][acc null])
|
|
(if (null? toklets)
|
|
(reverse acc)
|
|
(loop (drop toklets 7) (cons (take toklets 7) acc)))))
|
|
|
|
(define (parse src toks)
|
|
(for/list ([tok (in-list toks)])
|
|
(integer->char
|
|
(for/sum ([val (in-list tok)]
|
|
[power (in-naturals)]
|
|
#:when (eq? val 'taco))
|
|
(expt 2 power)))))
|
|
|
|
(define (read-syntax src ip)
|
|
(define toks (tokenize ip))
|
|
(define parse-tree (parse src toks))
|
|
(strip-context
|
|
(with-syntax ([PT parse-tree])
|
|
#'(module taco-mod tacopocalypse-demo
|
|
PT))))
|
|
|
|
(define-macro (mb PT)
|
|
#'(#%module-begin
|
|
(display (list->string 'PT))))
|
|
(provide (rename-out [mb #%module-begin])) |