facts-db/cl-facts/view.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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• view.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)
  
  ;;  View
  
  (defclass view ()
    ((refresh :initarg refresh
              :reader view-refresh
              :type function)
     (index :initform (make-usl :lessp lessp)
            :reader view-index
            :type usl)))
  
  (defmacro view-refresher ((view) &body body)
    `(lambda (,view)
       ,@body))
  
  (defun refresh-view (view)
    (funcall (view-refresh view) view))
  
  (defmacro defview (name &body body)
    `(progn
       (defvar ,name)
       (setq ,name (make-instance 'view
                                  :refresh (view-refresher
                                            (,name) ,@body)))
       (refresh-view ,name)
       ',name))
  

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