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beautiful-racket/beautiful-racket-demo/taco-victory-demo/main.rkt

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#lang br/quicklang
(require brag/support "grammar.rkt")
(provide (all-from-out br/quicklang) (all-defined-out))
(module+ reader
(provide read-syntax))
(define (tokenize ip)
(define lex
(lexer
["#$" lexeme]
["%" lexeme]
[any-char (lex input-port)]))
(lex ip))
(define (taco-program . pieces) pieces)
(define (taco-leaf . pieces)
(integer->char
(for/sum ([taco-or-not (in-list pieces)]
[pow (in-naturals)])
(* taco-or-not (expt 2 pow)))))
(define (taco) 1)
(define (not-a-taco) 0)
(define (read-syntax src ip)
(define token-thunk (λ () (tokenize ip)))
(define parse-tree (parse token-thunk))
(strip-context
(with-syntax ([PT parse-tree])
#'(module winner taco-victory-demo
(display (apply string PT))))))