facts-db/cl-facts/anon.lisp

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• Hash : d0286b85
  Author : Thomas de Grivel
  Date : 2022-11-18T18:33:51
  

  facts-db/cl-facts in-memory graph database
  

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• anon.lisp

• ;; cl-facts
  ;; Copyright 2011-2022 Thomas de Grivel <thodg@kmx.io>
  ;;
  ;; Permission is hereby granted to use this software granted
  ;; the above copyright notice and this permission paragraph
  ;; are included in all copies and substantial portions of this
  ;; software.
  ;;
  ;; THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
  ;; PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
  ;; AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
  ;; THIS SOFTWARE.
  
  (in-package :facts)
  
  ;;  Anonymous values
  
  (defpackage :facts.anon)
  
  (defvar *randomize-anon* nil)
  
  (defun anon (&rest sym-hints)
    (let* ((sym (intern
                 (with-output-to-string (out)
                   (write-string (string-upcase (first sym-hints)))
                   (dolist (sym-hint (rest sym-hints))
                     (write-char #\- out)
                     (write-string (string-upcase sym-hint))))
                 (find-package :facts.anon))))
      (labels ((guess (count)
                 (multiple-value-bind (n found) (intern
                                                 (format nil "~A-~4,'0X"
                                                         sym count)
                                                 :facts.anon)
                   (if found
                       (if *randomize-anon*
                           (guess (random most-positive-fixnum))
                           (guess (1+ count)))
                       (prog1 n
                         (setf (get sym 'anon-counter) count))))))
        (guess (or (get sym 'anon-counter) 0)))))
  
  (defmacro with-anon ((&rest vars) &body body)
    `(let ,(mapcar (lambda (var)
                     `(,var (anon ,(symbol-name var))))
                   vars)
       ,@body))
  

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