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beautiful-racket/beautiful-racket-demo/scriptish-demo/expander.rkt

59 lines
1.4 KiB
Racket

#lang br/quicklang
(require racket/stxparam)
(provide (all-defined-out) (all-from-out br/quicklang))
(define-macro top #'begin)
(define-macro (assignment ID VAL) #'(define ID VAL))
(define (add/concat . xs)
(cond
[(andmap number? xs) (apply + xs)]
[(ormap string? xs) (string-join (map ~a xs) "")]))
(define-macro-cases sumlike
[(_ VAL) #'VAL]
[(_ . VALS) #'(add/concat . VALS)])
(define-macro (object (K V) ...)
#'(make-hash (list (cons K V) ...)))
(define-macro (func-def (ARG ...) STMT ...)
#'(λ (ARG ...)
(let/cc return-cc
(syntax-parameterize ([return (make-rename-transformer #'return-cc)])
STMT ... (void)))))
(define-syntax-parameter return
(λ (stx) (error 'not-parameterized)))
(define-macro (dotted-id (BASE KEY ...))
#'(for/fold ([val BASE])
([key (in-list (list 'KEY ...))])
(cond
[(hash-ref val key #f)]
[(hash-ref val (symbol->string key) #f)]
[else (error 'dotted-failure)])))
(define-macro func-app #'#%app)
(define-macro (if COND . STMTS)
#'(when COND . STMTS))
(define-macro-cases comparison
[(_ VAL) #'VAL]
[(_ L == R) #'(equal? L R)]
[(_ L != R) #'(not (equal? L R))])
(define-macro (while COND STMT ...)
#'(let loop ()
(when COND
STMT ...
(loop))))
(define alert displayln)
(define-macro (increment ID)
#'(let ()
(set! ID (add1 ID))
ID))