155 lines
6.3 KiB
Scheme
155 lines
6.3 KiB
Scheme
;;;
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;;; Copyright (c) 1985 Massachusetts Institute of Technology
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;;;
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;;; This material was developed by the Scheme project at the
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;;; Massachusetts Institute of Technology, Department of
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;;; Electrical Engineering and Computer Science. Permission to
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;;; copy this software, to redistribute it, and to use it for any
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;;; purpose is granted, subject to the following restrictions and
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;;; understandings.
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;;;
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;;; 1. Any copy made of this software must include this copyright
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;;; notice in full.
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;;;
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;;; 2. Users of this software agree to make their best efforts (a)
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;;; to return to the MIT Scheme project any improvements or
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;;; extensions that they make, so that these may be included in
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;;; future releases; and (b) to inform MIT of noteworthy uses of
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;;; this software.
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;;;
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;;; 3. All materials developed as a consequence of the use of
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;;; this software shall duly acknowledge such use, in accordance
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;;; with the usual standards of acknowledging credit in academic
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;;; research.
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;;;
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;;; 4. MIT has made no warrantee or representation that the
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;;; operation of this software will be error-free, and MIT is
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;;; under no obligation to provide any services, by way of
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;;; maintenance, update, or otherwise.
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;;;
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;;; 5. In conjunction with products arising from the use of this
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;;; material, there shall be no use of the name of the
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;;; Massachusetts Institute of Technology nor of any adaptation
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;;; thereof in any advertising, promotional, or sales literature
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;;; without prior written consent from MIT in each case.
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;
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;;; Modified by Texas Instruments Inc 8/15/85
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;; Command Tables
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(define comtab '(()()))
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(define default-key #!false)
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(define (%set-comtab-key comtab char command)
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(vector-set! (cdr comtab) (char->integer char) command))
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(define (%set-comtab-entry! alists char command)
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(let ((entry (assq char (cdr alists))))
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(if entry
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(set-cdr! entry command)
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(set-cdr! alists (cons (cons char command) (cdr alists))))))
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(define (%comtab-make-prefix-char! alists char alists*)
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(let ((entry (assq char (car alists))))
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(if entry
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(set-cdr! entry alists*)
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(set-car! alists (cons (cons char alists*) (car alists))))))
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(define (comtab-lookup-prefix char receiver)
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(define (loop char->alist chars)
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(let ((entry (assq (car chars) char->alist)))
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(if entry
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(if (null? (cddr chars))
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(receiver (cdr entry) (cadr chars))
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(loop (cadr entry) (cdr chars)))
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(error "Not a prefix character" (car chars)))))
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(cond ((char? char)
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(receiver comtab char))
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((pair? char)
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(if (null? (cdr char))
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(receiver comtab (car char))
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(loop (car comtab) char)))
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(else
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(error "Unrecognizable character" char))))
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(define comtab-entry
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(letrec
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((ychar '())
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(receiver
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(lambda (alists char)
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(let ((entry (assq char (cdr alists))))
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(cond (entry (cdr entry))
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(default-key default-key)
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(t (editor-error (string-append "Unknown command: "
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(obj->string ychar)))))))))
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(lambda (xchar)
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(letrec
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((lookup-vector
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(lambda (*char*)
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(let ((*int* (char->integer *char*)))
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(if (< *int* 256) ;;; change to 256 for internationalize
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(vector-ref (cdr comtab) *int*)
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default-key)))))
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(cond ((char? xchar) (lookup-vector xchar))
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((and (pair? xchar) (null? (cdr xchar)))
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(lookup-vector (car xchar)))
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(else (set! ychar xchar)
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(comtab-lookup-prefix xchar receiver)))))))
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(define (set-comtab-entry! char command)
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(comtab-lookup-prefix char
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(lambda (alists char)
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(%set-comtab-entry! alists char command))))
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;;; These are not used becuase the initkey stuff is used to define keys
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;;;(define (define-key char command-name)
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;;; (let ((command (name->command command-name)))
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;;; (cond ((char? char)
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;;; (%set-comtab-key comtab (char-upcase char) command)
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;;; (if (char-alphabetic? char)
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;;; (%set-comtab-key comtab (char-downcase char) command)))
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;;; ((and (pair? char) (null? (cdr char)))
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;;; (%set-comtab-key comtab (char-upcase (car char)) command)
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;;; (if (char-alphabetic? char)
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;;; (%set-comtab-key comtab (char-downcase (car char)) command)))
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;;; ((pair? char)
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;;; (comtab-lookup-prefix char
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;;; (lambda (alists char)
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;;; (let ((upcase (char-upcase char)))
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;;; (%set-comtab-entry! alists upcase command)
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;;; (if (char-alphabetic? char)
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;;; (%set-comtab-entry! alists (char-downcase char)
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;;; command))))))
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;;; ((char-set? char)
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;;; (mapc (lambda (char) (set-comtab-entry! char command))
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;;; (char-set-members char)))
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;;; (else (error "Unknown character" char))))
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;;; char)
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;;;
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;;;(define (define-prefix-key char command-name)
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;;; (let ((command (name->command command-name)))
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;;; (cond ((or (char? char) (pair? char))
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;;; (comtab-lookup-prefix char
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;;; (lambda (alists char)
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;;; (let ((upcase (char-upcase char)))
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;;; (%set-comtab-key alists upcase command)
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;;; (%comtab-make-prefix-char! alists upcase (cons '() '()))
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;;; (if (char-alphabetic? char)
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;;; (%comtab-make-synonym-char! alists (char-downcase char)
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;;; alists upcase))))))
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;;; (else (error "Unknown character" char))))
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;;; char)
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;;;
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;;;(define (define-default-key command-name)
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;;; (let ((command (name->command command-name)))
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;;; (set! default-key command)
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;;; (set-cdr! comtab (make-vector 128 command))))
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