87 lines
2.5 KiB
Scheme
87 lines
2.5 KiB
Scheme
;;
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;; util-proc.scm
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;;
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;; Auxiliary procedure functions.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit util-proc))
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(module
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util-proc
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(
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procedure-arity=?
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procedure-arity>=?
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procedure-arity>?
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procedure-num-args
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procedure-arg-names
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)
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(import scheme
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(chicken base))
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;; Returns two values: the proper part of the list length and #t if
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;; there is an improper list end
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(define (improper-list-info lst)
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(let loop ((lst lst)
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(len 0))
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(if (symbol? lst)
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(values len #t)
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(if (null? lst)
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(values len #f)
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(loop (cdr lst)
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(add1 len))))))
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;; Returns two values: the number of mandatory arguments and
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;; information whether the procedure accepts optional arguments
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(define (procedure-arity-info proc)
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(let-values (((len rest?) (improper-list-info (procedure-information proc))))
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(values (sub1 len) rest?)))
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;; Returns true if given procedure arity is exactly n
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(define ((procedure-arity=? n) proc)
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(let-values (((args rest?) (procedure-arity-info proc)))
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(and (not rest?)
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(= args n))))
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;; Returns true if given procedure arity is greater than or equal to n
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(define ((procedure-arity>=? n) proc)
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(let-values (((args rest?) (procedure-arity-info proc)))
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(or rest?
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(>= args n))))
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;; Returns true if given procedure arity is greater than n
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(define ((procedure-arity>? n) proc)
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(let-values (((args rest?) (procedure-arity-info proc)))
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(or rest?
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(> args n))))
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;; Returns the number of mandatory arguments
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(define (procedure-num-args proc)
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(let-values (((args rest?) (procedure-arity-info proc)))
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args))
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;; Returns the formal argument names for given procedure
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(define (procedure-arg-names proc)
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(cdr (procedure-information proc)))
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)
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