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28 lines
854 B
Racket
28 lines
854 B
Racket
#lang br/quicklang
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(define (read-syntax path port)
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(define args (port->lines port))
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(define arg-datums (format-datums '~a args))
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(define module-datum `(module stacker-mod "funstacker.rkt"
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(handle-args ,@arg-datums)))
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(datum->syntax #f module-datum))
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(provide read-syntax)
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(define-macro (funstacker-module-begin HANDLE-ARGS-EXPR)
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#'(#%module-begin
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(display (first HANDLE-ARGS-EXPR))))
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(provide (rename-out [funstacker-module-begin #%module-begin]))
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(define (handle-args . args)
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(for/fold ([stack-acc empty])
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([arg (filter-not void? args)])
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(cond
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[(number? arg) (cons arg stack-acc)]
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[(or (equal? * arg) (equal? + arg))
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(define op-result
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(arg (first stack-acc) (second stack-acc)))
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(cons op-result (drop stack-acc 2))])))
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(provide handle-args)
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(provide + *)
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