Annotation of gforth/kernel/accept.fs, revision 1.2

1.1       anton       1: \ Input                                                13feb93py
                      2: 
1.2     ! anton       3: \ Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
1.1       anton       4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
                      9: \ as published by the Free Software Foundation; either version 2
                     10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
                     18: \ along with this program; if not, write to the Free Software
                     19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     20: 
                     21: : (ins) ( max span addr pos1 key -- max span addr pos2 )
                     22:     >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
                     23: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
                     24:     dup IF
                     25:        #bs emit bl emit #bs emit 1- rot 1- -rot
                     26:     THEN false ;
                     27: : (ret)  true bl emit ;
                     28: 
                     29: Create ctrlkeys
                     30:   ] false false false false  false false false false
                     31:     (bs)  false (ret) false  false (ret) false false
                     32:     false false false false  false false false false
                     33:     false false false false  false false false false [
                     34: 
                     35: defer insert-char
                     36: ' (ins) IS insert-char
                     37: defer everychar
                     38: ' noop IS everychar
                     39: 
                     40: : decode ( max span addr pos1 key -- max span addr pos2 flag )
                     41:   everychar
                     42:   dup #del = IF  drop #bs  THEN  \ del is rubout
                     43:   dup bl <   IF  cells ctrlkeys + perform  EXIT  THEN
                     44:   >r 2over = IF  rdrop bell 0 EXIT  THEN
                     45:   r> insert-char 0 ;
                     46: 
                     47: : accept   ( addr len -- len ) \ core
                     48:   dup 0< IF    abs over dup 1 chars - c@ tuck type 
                     49: \ this allows to edit given strings
                     50:   ELSE  0  THEN rot over
                     51:   BEGIN  key decode  UNTIL
                     52:   2drop nip ;
                     53: 

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