From f19194e4bab59e24b445dcecfb44c627a2f623f0 Mon Sep 17 00:00:00 2001
From: Stephen Adams <edu/mit/csail/zurich/adams>
Date: Tue, 1 Nov 1994 23:02:14 +0000
Subject: [PATCH] Added a feature to decode special keys that are defined in
the termcap entry. These now appear to Edwin as the special keys like up,
left and f5.
---
v7/src/edwin/tterm.scm | 169 +++++++++++++++++++++++++++++++----------
1 file changed, 127 insertions(+), 42 deletions(-)
diff --git a/v7/src/edwin/tterm.scm b/v7/src/edwin/tterm.scm
index adb569fcc..22268ae8e 100644
--- a/v7/src/edwin/tterm.scm
+++ b/v7/src/edwin/tterm.scm
@@ -1,6 +1,6 @@
#| -*-Scheme-*-
-$Id: tterm.scm,v 1.24 1993/09/02 20:22:07 gjr Exp $
+$Id: tterm.scm,v 1.25 1994/11/01 23:02:14 adams Exp $
Copyright (c) 1990-1993 Massachusetts Institute of Technology
@@ -71,7 +71,8 @@ MIT in each case. |#
insert-line-next-cost
delete-line-cost
delete-line-next-cost
- scroll-region-cost)))
+ scroll-region-cost
+ (make-key-table description))))
console-beep
console-clear-line!
console-clear-rectangle!
@@ -141,33 +142,109 @@ MIT in each case. |#
(not (or (tf-hazeltine description)
(tf-teleray description)
(tf-underscore description))))
+
+(define (make-key-table description)
+ (append-map
+ (lambda (name+key)
+ (let ((name (first name+key))
+ (key (second name+key)))
+ (let ((pair (assoc name (termcap-description-keys description))))
+ (if (and pair (cdr pair))
+ (list (cons (cdr pair) key))
+ '() ))))
+ `((up ,up)
+ (down ,down)
+ (left ,left)
+ (right ,right)
+ (f1 ,f1)
+ (f2 ,f2)
+ (f3 ,f3)
+ (f4 ,f4)
+ (f5 ,f5)
+ (f6 ,f6)
+ (f7 ,f7)
+ (f8 ,f8)
+ (f9 ,f9)
+ (f10 ,f10)
+ (f11 ,f11)
+ (f12 ,f12)
+ )))
-(define (get-console-input-operations)
+(define (get-console-input-operations terminal-state)
(let ((channel (input-port/channel console-input-port))
- (string (make-string input-buffer-size))
- (start input-buffer-size)
- (end input-buffer-size))
+ (string (make-string (* 3 input-buffer-size)))
+ (start 0)
+ (end 0)
+ (incomplete-pending #F)
+ (timeout-interval 1000) ; 1s. Should be f(baud rate) etc
+ (len 0)) ; length of event in input characters
+ ;; When the input is a prefix of the character sequence sent by some key
+ ;; we are prepared to wait a little while to see if the rest of
+ ;; the sequence arrives. INCOMPLETE-PENDING is either #F, the
+ ;; real time at which we timeout for waiting for the sequence to
+ ;; complete, or #T if a timeout occured.
(letrec
- ((read-char
+ ((parse-key ; -> #F or a char? or a special-key?
+ (lambda ()
+ (and (fix:< start end)
+ (let ((n-chars (fix:- end start)))
+ (let find ((key-pairs (terminal-state/key-table terminal-state))
+ (possible-pending? #F))
+ (if (null? key-pairs)
+ (begin
+ (if (number? incomplete-pending)
+ (if (or (not possible-pending?)
+ (> (real-time-clock) incomplete-pending))
+ (set! incomplete-pending #T)))
+ (if (number? incomplete-pending)
+ #F
+ (begin
+ (set! len 1)
+ (string-ref string start))))
+
+ (let* ((key-seq (caar key-pairs))
+ (n-seq (string-length key-seq)))
+ (cond ((and (fix:<= n-seq n-chars)
+ (substring=? string start
+ (fix:+ start n-seq)
+ key-seq 0 n-seq))
+ (set! len n-seq)
+ (cdar key-pairs))
+ ((and (fix:> n-seq n-chars)
+ (substring=? string start
+ (fix:+ start n-chars)
+ key-seq 0 n-chars))
+ (if (not incomplete-pending)
+ (set! incomplete-pending
+ (+ (real-time-clock)
+ timeout-interval)))
+ (find (cdr key-pairs) #T))
+ (else
+ (find (cdr key-pairs) possible-pending?))))))))))
+ (read-more? ; -> #F or #T is some chars were read
(lambda (block?)
(if block?
(channel-blocking channel)
(channel-nonblocking channel))
- (let ((n
- (channel-read channel
- string 0 input-buffer-size)))
- (cond ((not n) #f)
+ (let ((n (channel-read channel string end input-buffer-size)))
+ (cond ((not n) #F)
((fix:> n 0)
- (set! start 0)
- (set! end n)
- (if transcript-port
- (output-port/write-substring transcript-port
- string 0 n))
- (string-ref string 0))
+ (let ((new-end (fix:+ end n)))
+ (if transcript-port
+ (output-port/write-substring transcript-port
+ string end new-end))
+ (set! end new-end))
+ #T)
((fix:= n 0)
- (error "Reached EOF in keyboard input."))
+ ;;(error "Reached EOF in keyboard input.")
+ #F)
(else
(error "Illegal return value:" n))))))
+ (read-char
+ (lambda (block?)
+ (if (read-more? block?)
+ (parse-key)
+ #F)))
(read-event
(lambda (block?)
(or (read-char #f)
@@ -188,39 +265,45 @@ MIT in each case. |#
(lambda ()
(let ((event (read-event #t)))
(cond ((char? event) event)
+ ((special-key? event) event)
((process-change-event event)
=> (lambda (flag)
(make-input-event
(if (eq? flag 'FORCE-RETURN) 'RETURN 'UPDATE)
update-screens! #f)))
- (else (guarantee-result)))))))
+ (else (guarantee-result))))))
+ (consume!
+ (lambda (bytes)
+ (set! start (fix:+ start bytes))
+ (cond ((fix:>= start end) ; all consumed
+ (set! end 0)
+ (set! start 0))
+ ((fix:>= start input-buffer-size)
+ (substring-move-left! string start end string 0)
+ (set! end (fix:- end start))
+ (set! start 0)))
+ (set! incomplete-pending #F)
+ unspecific)))
(values
(lambda () ;halt-update?
(or (fix:< start end)
(read-char #f)))
(lambda () ;peek-no-hang
- (if (fix:< start end)
- (string-ref string start)
- (let loop ()
- (let ((event (read-event #f)))
- (if (fix:fixnum? event)
- (begin
- (process-change-event event)
- #f)
- event)))))
+ (or (parse-key)
+ (let ((event (read-event #f)))
+ (if (fix:fixnum? event)
+ (begin
+ (process-change-event event)
+ #f)
+ event))))
(lambda () ;peek
- (if (fix:< start end)
- (string-ref string start)
+ (or (parse-key)
(guarantee-result)))
(lambda () ;read
- (if (fix:< start end)
- (let ((char (string-ref string start)))
- (set! start (fix:+ start 1))
- char)
- (let ((event (guarantee-result)))
- (if (char? event)
- (set! start (fix:+ start 1)))
- event)))))))
+ (let ((event (or (parse-key) (guarantee-result))))
+ (consume! len)
+ event))))))
+
(define-integrable input-buffer-size 16)
(define-integrable event:process-output -2)
@@ -266,8 +349,8 @@ MIT in each case. |#
console-available?
make-console-screen
(lambda (screen)
- screen
- (get-console-input-operations))
+ (get-console-input-operations
+ (screen-state screen)))
with-console-grabbed
with-console-interrupts-enabled
with-console-interrupts-disabled))
@@ -346,7 +429,8 @@ MIT in each case. |#
insert-line-next-cost
delete-line-cost
delete-line-next-cost
- scroll-region-cost))
+ scroll-region-cost
+ key-table))
(conc-name terminal-state/))
(description false read-only true)
(baud-rate-index false read-only true)
@@ -361,7 +445,8 @@ MIT in each case. |#
(standout-mode? false)
(insert-mode? false)
(delete-mode? false)
- (scroll-region false))
+ (scroll-region false)
+ (key-table false))
(let-syntax ((define-accessor
(macro (name)
--
2.25.1