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37 lines
1.1 KiB
Racket
37 lines
1.1 KiB
Racket
9 years ago
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#lang br
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9 years ago
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(module reader br
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(define (read-syntax src-path src-port)
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(define src-strs (port->lines src-port))
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(define (make-datum str) (format-datum '(dispatch ~a) str))
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(define src-exprs (map make-datum src-strs))
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(inject-syntax ([#'(list src-expr ...) src-exprs])
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#'(module stacker-mod "stacker-lang.rkt"
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src-expr ...)))
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(provide read-syntax))
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9 years ago
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(define #'(stacker-module-begin reader-line ...)
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#'(#%module-begin
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reader-line ...
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(display (first stack))))
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(provide (rename-out [stacker-module-begin #%module-begin]))
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(define stack (list 0 0))
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(define (push num) (set! stack (cons num stack)))
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(define (dispatch arg-1 [arg-2 #f])
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(cond
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[(number? arg-2) (push arg-2)]
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[else
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(define op arg-1)
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(define op-result (op (first stack) (second stack)))
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(set! stack (cons op-result (drop stack 2)))]))
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#;(define dispatch
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(case-lambda
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[(push num) (push num)]
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[(stack-op)
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(define op-result (stack-op (first stack) (second stack)))
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(set! stack (cons op-result (drop stack 2)))]))
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(provide #%top-interaction)
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