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gwish.scm, hcons.scm, lineio.scm, mapping.scm, nonblocking.scm, oldprint.scm, poe.scm, r4rs.scm, source.scm, tags.scm, test.scm, threads.scm: New address for FSF.
123 lines
4.1 KiB
Scheme
123 lines
4.1 KiB
Scheme
;;;; Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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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, or (at your option)
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;;;; 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 software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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;;;; Boston, MA 02111-1307 USA
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;;;;
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;;; {Print}
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;;;
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;;; This code was removed from boot-9.scm by MDJ 970301
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;;; <djurfeldt@nada.kth.se>. It is placed here for archival
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;;; purposes.
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(define (print obj . args)
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(let ((default-args (list (current-output-port) 0 0 default-print-style #f)))
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(apply-to-args (append args (list-cdr-ref default-args (length args)))
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(lambda (port depth length style table)
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(cond
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((and table (print-table-ref table obj))
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((print-style-tag-hook style 'eq-val)
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obj port depth length style table))
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(else
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(and table (print-table-add! table obj))
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(cond
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((print-style-max-depth? style depth)
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((print-style-excess-depth-hook style)))
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((print-style-max-length? style length)
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((print-style-excess-length-hook style)))
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(else
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((print-style-hook style obj)
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obj port depth length style table)))))))))
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(define (make-print-style) (make-vector 59 '()))
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(define (extend-print-style! style utag printer)
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(hashq-set! style utag printer))
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(define (print-style-hook style obj)
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(let ((type-tag (tag obj)))
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(or (hashq-ref style type-tag)
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(hashq-ref style (logand type-tag 255))
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print-obj)))
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(define (print-style-tag-hook style type-tag)
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(or (hashq-ref style type-tag)
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print-obj))
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(define (print-style-max-depth? style d) #f)
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(define (print-style-max-length? style l) #f)
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(define (print-style-excess-length-hook style)
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(hashq-ref style 'excess-length-hook))
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(define (print-style-excess-depth-hook style)
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(hashq-ref style 'excess-depth-hook))
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(define (make-print-table) (make-vector 59 '()))
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(define (print-table-ref table obj) (hashq-ref table obj))
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(define (print-table-add! table obj) (hashq-set! table obj (gensym 'ref)))
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(define (print-obj obj port depth length style table) (write obj port))
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(define (print-pair pair port depth length style table)
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(if (= 0 length)
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(display #\( port))
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(print (car pair) port (+ 1 depth) 0 style table)
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(cond
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((and (pair? (cdr pair))
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(or (not table)
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(not (print-table-ref table (cdr pair)))))
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(display #\space port)
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(print (cdr pair) port depth (+ 1 length) style table))
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((null? (cdr pair)) (display #\) port))
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(else (display " . " port)
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(print (cdr pair) port (+ 1 depth) 0
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style table)
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(display #\) port))))
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(define (print-vector obj port depth length style table)
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(if (= 0 length)
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(cond
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((weak-key-hash-table? obj) (display "#wh(" port))
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((weak-value-hash-table? obj) (display "#whv(" port))
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((doubly-weak-hash-table? obj) (display "#whd(" port))
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(else (display "#(" port))))
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(if (< length (vector-length obj))
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(print (vector-ref obj length) port (+ 1 depth) 0 style table))
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(cond
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((>= (+ 1 length) (vector-length obj)) (display #\) port))
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(else (display #\space port)
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(print obj port depth
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(+ 1 length)
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style table))))
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(define default-print-style (make-print-style))
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(extend-print-style! default-print-style utag_vector print-vector)
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(extend-print-style! default-print-style utag_wvect print-vector)
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(extend-print-style! default-print-style utag_pair print-pair)
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(extend-print-style! default-print-style 'eq-val
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(lambda (obj port depth length style table)
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(if (symbol? obj)
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(display obj)
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(begin
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(display "##" port)
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(display (print-table-ref table obj))))))
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