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64 lines
1.6 KiB
Racket
64 lines
1.6 KiB
Racket
#lang br/quicklang
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(define-macro (bf-module-begin PARSE-TREE)
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#'(#%module-begin
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PARSE-TREE))
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(provide (rename-out [bf-module-begin #%module-begin]))
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(define (fold-funcs apl bf-funcs)
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(for/fold ([current-apl apl])
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([bf-func (in-list bf-funcs)])
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(apply bf-func current-apl)))
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(define-macro (bf-program OP-OR-LOOP-ARG ...)
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#'(begin
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(define first-apl (list (make-vector 30000 0) 0))
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(void (fold-funcs first-apl (list OP-OR-LOOP-ARG ...)))))
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(provide bf-program)
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(define-macro (bf-loop "[" OP-OR-LOOP-ARG ... "]")
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#'(lambda (arr ptr)
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(for/fold ([current-apl (list arr ptr)])
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([i (in-naturals)]
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#:break (zero? (apply current-byte
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current-apl)))
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(fold-funcs current-apl (list OP-OR-LOOP-ARG ...)))))
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(provide bf-loop)
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(define-macro-cases bf-op
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[(bf-op ">") #'gt]
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[(bf-op "<") #'lt]
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[(bf-op "+") #'plus]
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[(bf-op "-") #'minus]
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[(bf-op ".") #'period]
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[(bf-op ",") #'comma])
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(provide bf-op)
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(define (current-byte arr ptr) (vector-ref arr ptr))
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(define (set-current-byte arr ptr val)
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(define new-arr (vector-copy arr))
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(vector-set! new-arr ptr val)
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new-arr)
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(define (gt arr ptr) (list arr (add1 ptr)))
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(define (lt arr ptr) (list arr (sub1 ptr)))
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(define (plus arr ptr)
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(list
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(set-current-byte arr ptr (add1 (current-byte arr ptr)))
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ptr))
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(define (minus arr ptr)
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(list
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(set-current-byte arr ptr (sub1 (current-byte arr ptr)))
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ptr))
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(define (period arr ptr)
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(write-byte (current-byte arr ptr))
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(list arr ptr))
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(define (comma arr ptr)
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(list (set-current-byte arr ptr (read-byte)) ptr))
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