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