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Code Editor : poe.scm
;;; installed-scm-file ;;;; Copyright (C) 1996, 2001, 2006, 2011 Free Software Foundation, Inc. ;;;; ;;;; This library is free software; you can redistribute it and/or ;;;; modify it under the terms of the GNU Lesser General Public ;;;; License as published by the Free Software Foundation; either ;;;; version 3 of the License, or (at your option) any later version. ;;;; ;;;; This library is distributed in the hope that it will be useful, ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;;;; Lesser General Public License for more details. ;;;; ;;;; You should have received a copy of the GNU Lesser General Public ;;;; License along with this library; if not, write to the Free Software ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ;;;; (define-module (ice-9 poe) :use-module (ice-9 hcons) :export (pure-funcq perfect-funcq)) ;;; {Pure Functions} ;;; ;;; A pure function (of some sort) is characterized by two equality ;;; relations: one on argument lists and one on return values. ;;; A pure function is one that when applied to equal arguments lists ;;; yields equal results. ;;; ;;; If the equality relationship on return values can be eq?, it may make ;;; sense to cache values returned by the function. Choosing the right ;;; equality relation on arguments is tricky. ;;; ;;; {pure-funcq} ;;; ;;; The simplest case of pure functions are those in which results ;;; are only certainly eq? if all of the arguments are. These functions ;;; are called "pure-funcq", for obvious reasons. ;;; (define funcq-memo (make-weak-key-hash-table 523)) ; !!! randomly selected values (define funcq-buffer (make-gc-buffer 256)) (define (funcq-hash arg-list n) (let ((it (let loop ((x 0) (arg-list arg-list)) (if (null? arg-list) (modulo x n) (loop (logior x (hashq (car arg-list) 4194303)) (cdr arg-list)))))) it)) ;; return true if lists X and Y are the same length and each element is `eq?' (define (eq?-list x y) (if (null? x) (null? y) (and (not (null? y)) (eq? (car x) (car y)) (eq?-list (cdr x) (cdr y))))) (define (funcq-assoc arg-list alist) (if (null? alist) #f (if (eq?-list arg-list (caar alist)) (car alist) (funcq-assoc arg-list (cdr alist))))) (define not-found (list 'not-found)) (define (pure-funcq base-func) (lambda args (let* ((key (cons base-func args)) (cached (hashx-ref funcq-hash funcq-assoc funcq-memo key not-found))) (if (not (eq? cached not-found)) (begin (funcq-buffer key) cached) (let ((val (apply base-func args))) (funcq-buffer key) (hashx-set! funcq-hash funcq-assoc funcq-memo key val) val))))) ;;; {Perfect funq} ;;; ;;; A pure funq may sometimes forget its past but a perfect ;;; funcq never does. ;;; (define (perfect-funcq size base-func) (define funcq-memo (make-hash-table size)) (lambda args (let* ((key (cons base-func args)) (cached (hashx-ref funcq-hash funcq-assoc funcq-memo key not-found))) (if (not (eq? cached not-found)) (begin (funcq-buffer key) cached) (let ((val (apply base-func args))) (funcq-buffer key) (hashx-set! funcq-hash funcq-assoc funcq-memo key val) val)))))
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