48 lines
1.5 KiB
Scheme
48 lines
1.5 KiB
Scheme
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;; Copyright (C) Johan Ceuppens 2013
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;;
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 2 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(load "meta-gc.scm")
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;; special REPL
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;; You can add REPL functions such as ((make-meta) 'cons our-cons)
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(define (make-meta)
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(let ((*applicants '()))
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(define (add-hook symbol fun)
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(set! *applicants (append *applicants (list (cons symbol fun)))))
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(define (search-applicants msgsymbol)
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(do ((l *applicants (cdr *applicants)))
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((cond ((null? l)
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#f)
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((eq? (caar *applicants) msgsymbol)
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(cdar *applicants))
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))))
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;; dynamically bound f- function
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(define (post-applicants args)
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(if (procedure? f-)
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(f- args)))
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(define (dispatch msg)
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(cond ((eq? msg 'add-hook) add-hook)
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((let ((f- (search-applicants msg)))
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(if f-
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post-applicants)))
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(else (display "make-meta : message not understood : ")(display msg)(newline)
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)))
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dispatch))
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