88 lines
3.4 KiB
Scheme
88 lines
3.4 KiB
Scheme
;; Reference Implementation from SRFI 156
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;;
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;; Copyright (C) Panicz Maciej Godek (2017). All Rights Reserved.
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;;
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;; Permission is hereby granted, free of charge, to any person obtaining a copy
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;; of this software and associated documentation files (the "Software"), to
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;; deal in the Software without restriction, including without limitation the
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;; rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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;; sell copies of the Software, and to permit persons to whom the Software is
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;; furnished to do so, subject to the following conditions:
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;;
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;; The above copyright notice and this permission notice shall be included in
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;; all copies or substantial portions of the Software.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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;; IN THE SOFTWARE.
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;;
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;; 12/31/2017 - AWK - shimmed extract-placehoders to allow for _ in R6RS scheme
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(define-syntax infix/postfix
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(syntax-rules ()
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((infix/postfix x somewhat?)
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(somewhat? x))
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((infix/postfix left related-to? right)
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(related-to? left right))
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((infix/postfix left related-to? right . likewise)
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(let ((right* right))
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(and (infix/postfix left related-to? right*)
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(infix/postfix right* . likewise))))))
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(define-syntax extract-placeholders
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(lambda (x)
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(syntax-case x ()
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[(_ final () () body) #'(final (infix/postfix . body))]
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[(_ final () args body) #'(lambda args (final (infix/postfix . body)))]
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[(k final (underscore op . rest) (args ...) (body ...))
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(eq? (syntax->datum #'underscore) '_)
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#'(k final rest (args ... arg) (body ... arg op))]
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[(k final (arg op . rest) args (body ...))
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#'(k final rest args (body ... arg op))]
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[(k final (underscore) (args ...) (body ...))
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(eq? (syntax->datum #'underscore) '_)
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#'(k final () (args ... arg) (body ... arg))]
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[(k final (arg) args (body ...))
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#'(k final () args (body ... arg))])))
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#;(define-syntax extract-placeholders
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(syntax-rules (_)
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((extract-placeholders final () () body)
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(final (infix/postfix . body)))
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((extract-placeholders final () args body)
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(lambda args (final (infix/postfix . body))))
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((extract-placeholders final (_ op . rest) (args ...) (body ...))
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(extract-placeholders final rest (args ... arg) (body ... arg op)))
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((extract-placeholders final (arg op . rest) args (body ...))
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(extract-placeholders final rest args (body ... arg op)))
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((extract-placeholders final (_) (args ...) (body ...))
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(extract-placeholders final () (args ... arg) (body ... arg)))
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((extract-placeholders final (arg) args (body ...))
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(extract-placeholders final () args (body ... arg)))))
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(define-syntax identity-syntax
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(syntax-rules ()
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((identity-syntax form)
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form)))
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(define-syntax is
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(syntax-rules ()
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((is . something)
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(extract-placeholders identity-syntax something () ()))))
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(define-syntax isnt
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(syntax-rules ()
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((isnt . something)
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(extract-placeholders not something () ()))))
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