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\ Input 13feb93py
\ Copyright (C) 1995,1996,1997,1999,2003 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.
\ This program 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 General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
: (ins) ( max span addr pos1 key -- max span addr pos2 )
>r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
: (bs) ( max span addr pos1 -- max span addr pos2 flag )
dup IF
#bs emit space #bs emit 1- rot 1- -rot
THEN false ;
: (ret) ( max span addr pos1 -- max span addr pos2 flag )
true space ;
Create ctrlkeys
' false a, ' false a, ' false a, ' false a,
' false a, ' false a, ' false a, ' false a,
' (bs) a, ' false a, ' (ret) a, ' false a,
' false a, ' (ret) a, ' false a, ' false a,
' false a, ' false a, ' false a, ' false a,
' false a, ' false a, ' false a, ' false a,
' false a, ' false a, ' false a, ' false a,
' false a, ' false a, ' false a, ' false a,
defer insert-char
' (ins) IS insert-char
defer everychar
' noop IS everychar
: decode ( max span addr pos1 key -- max span addr pos2 flag )
everychar
dup -1 = IF drop 4 THEN \ -1 is EOF
dup #del = IF drop #bs THEN \ del is rubout
dup bl u< IF cells ctrlkeys + perform EXIT THEN
\ check for end reached
>r 2over = IF rdrop bell 0 EXIT THEN
r> insert-char 0 ;
: edit-line ( c-addr n1 n2 -- n3 ) \ gforth
\G edit the string with length @var{n2} in the buffer @var{c-addr
\G n1}, like @code{accept}.
rot over
2dup type
BEGIN key decode UNTIL
2drop nip ;
: accept ( c-addr +n1 -- +n2 ) \ core
\G Get a string of up to @var{n1} characters from the user input
\G device and store it at @var{c-addr}. @var{n2} is the length of
\G the received string. The user indicates the end by pressing
\G @key{RET}. Gforth supports all the editing functions available
\G on the Forth command line (including history and word
\G completion) in @code{accept}.
dup 0< -&24 and throw \ use edit-line to edit given strings
0 edit-line ;
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