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59 lines
No EOL
2.2 KiB
Scheme
59 lines
No EOL
2.2 KiB
Scheme
;;;; Utilities used by HAMT
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;;; Copyright MMIV-MMXVII Arthur A. Gleckler. All rights reserved.
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;; Permission is hereby granted, free of charge, to any person
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;; obtaining a copy of this software and associated documentation
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;; files (the "Software"), to deal in the Software without
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;; restriction, including without limitation the rights to use, copy,
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;; modify, merge, publish, distribute, sublicense, and/or sell copies
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;; 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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;; The above copyright notice and this permission notice shall be
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;; included in all copies or substantial portions of the Software.
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;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;; DEALINGS IN THE SOFTWARE.
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(define-syntax assert
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(syntax-rules ()
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((_ (operator argument ...))
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(unless (operator argument ...)
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(error "Assertion failed:"
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'(operator argument ...)
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(list 'operator argument ...))))
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((_ expression)
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(unless expression
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(error "Assertion failed:" 'expression)))))
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(define-syntax do-list
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(syntax-rules ()
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((_ (variable list) body ...)
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(do ((remaining list (cdr remaining)))
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((null? remaining))
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(let ((variable (car remaining)))
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body ...)))
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((_ (element-variable index-variable list) body ...)
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(do ((remaining list (cdr remaining))
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(index-variable 0 (+ index-variable 1)))
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((null? remaining))
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(let ((element-variable (car remaining)))
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body ...)))))
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(define string-comparator
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(make-comparator string? string=? #f string-hash))
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(define (make-string-hash-table)
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(make-hash-table string-comparator))
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(define (with-output-to-string thunk)
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(parameterize ((current-output-port (open-output-string)))
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(thunk)
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(get-output-string (current-output-port)))) |