DataMuseum.dk

top - download

    Length: 2774 (0xad6)
    Types: TextFile
    Names: »xpatch.scm.6«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─ ⟦this⟧ »EUUGD11/gnu-31mar87/scheme/scm/xpatch.scm.6« 

TextFile

;;; -*-Scheme-*-
;;;
;;;	Copyright (c) 1984 Massachusetts Institute of Technology
;;;
;;;	This material was developed by the Scheme project at the
;;;	Massachusetts Institute of Technology, Department of
;;;	Electrical Engineering and Computer Science.  Permission to
;;;	copy this software, to redistribute it, and to use it for any
;;;	purpose is granted, subject to the following restrictions and
;;;	understandings.
;;;
;;;	1. Any copy made of this software must include this copyright
;;;	notice in full.
;;;
;;;	2. Users of this software agree to make their best efforts (a)
;;;	to return to the MIT Scheme project any improvements or
;;;	extensions that they make, so that these may be included in
;;;	future releases; and (b) to inform MIT of noteworthy uses of
;;;	this software.
;;;
;;;	3.  All materials developed as a consequence of the use of
;;;	this software shall duly acknowledge such use, in accordance
;;;	with the usual standards of acknowledging credit in academic
;;;	research.
;;;
;;;	4. MIT has made no warrantee or representation that the
;;;	operation of this software will be error-free, and MIT is
;;;	under no obligation to provide any services, by way of
;;;	maintenance, update, or otherwise.
;;;
;;;	5.  In conjunction with products arising from the use of this
;;;	material, there shall be no use of the name of the
;;;	Massachusetts Institute of Technology nor of any adaptation
;;;	thereof in any advertising, promotional, or sales literature
;;;	without prior written consent from MIT in each case.
;;;

;;;; Special LAMBDA Interface

(declare (usual-integrations))
\f


(define (lambda-components** lambda receiver)
  (lambda-components lambda
    (lambda (name required optional rest auxiliary body)
      (let ((rest-list (if (null? rest) '() (list rest))))
	(receiver (list required optional rest-list)
		  `(,name ,@required ,@optional ,@rest-list ,@auxiliary)
		  body)))))

(define (make-lambda** pattern bound body)
  (define (split pattern bound receiver)
    (cond ((null? pattern)
	   (receiver '() bound))
	  (else
	   (split (cdr pattern) (cdr bound)
	     (lambda (copy tail)
	       (receiver (cons (car bound) copy)
			 tail))))))
  (split (first pattern) (cdr bound)
    (lambda (required tail)
      (split (second pattern) tail
	(lambda (optional tail)
	  (split (third pattern) tail
	    (lambda (rest auxiliary)
	      ;; Must do this strange scannery to guarantee
	      ;; that any newly-visible open-blocks have their
	      ;; names properly merged with existing auxiliaries.
	      (scan-defines (unscan-defines auxiliary body)
		(lambda (auxiliary* body*)
		  (make-lambda (car bound)
			       required
			       optional
			       (if (null? rest) rest (car rest))
			       auxiliary*
			       body*))))))))))