File:  [gforth] / gforth / kernel / accept.fs
Revision 1.22: download - view: text, annotated - select for diffs
Mon Dec 31 18:40:25 2007 UTC (14 years, 11 months ago) by anton
Branches: MAIN
CVS tags: v0-7-0, HEAD
updated copyright notices for GPL v3

    1: \ Input                                                13feb93py
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999,2003,2004,2005,2006,2007 Free Software Foundation, Inc.
    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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: : (ins) ( max span addr pos1 key -- max span addr pos2 )
   21:     >r  2over = IF  rdrop bell  EXIT  THEN
   22:     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 space #bs emit 1- rot 1- -rot
   26:     THEN false ;
   27: : (ret) ( max span addr pos1 -- max span addr pos2 flag )
   28:     true space ;
   29: 
   30: Create ctrlkeys
   31:     ' false a, ' false a, ' false a, ' false a, 
   32:     ' false a, ' false a, ' false a, ' false a,
   33: 
   34:     ' (bs)  a, ' false a, ' (ret) a, ' false a, 
   35:     ' false a, ' (ret) a, ' false a, ' false a,
   36: 
   37:     ' false a, ' false a, ' false a, ' false a, 
   38:     ' false a, ' false a, ' false a, ' false a,
   39: 
   40:     ' false a, ' false a, ' false a, ' false a, 
   41:     ' false a, ' false a, ' false a, ' false a,
   42: 
   43: defer insert-char
   44: ' (ins) IS insert-char
   45: defer everychar
   46: ' noop IS everychar
   47: defer everyline
   48: ' noop IS everyline
   49: 
   50: : decode ( max span addr pos1 key -- max span addr pos2 flag )
   51:     \ perform action corresponding to key; addr max is the buffer,
   52:     \ addr span is the current string in the buffer, and pos1 is the
   53:     \ cursor position in the buffer.
   54:     everychar
   55:     dup -1 =   IF  drop 4  THEN  \ -1 is EOF
   56:     dup #del = IF  drop #bs  THEN  \ del is rubout
   57:     dup bl u<  IF  cells ctrlkeys + perform  EXIT  THEN
   58:     \ check for end reached
   59:     insert-char 0 ;
   60: 
   61: : edit-line ( c-addr n1 n2 -- n3 ) \ gforth
   62:     \G edit the string with length @var{n2} in the buffer @var{c-addr
   63:     \G n1}, like @code{accept}.
   64:     everyline
   65:     rot over
   66:     2dup type
   67:     BEGIN  xkey decode  UNTIL
   68:     2drop nip ;
   69:     
   70: : accept   ( c-addr +n1 -- +n2 ) \ core
   71:     \G Get a string of up to @var{n1} characters from the user input
   72:     \G device and store it at @var{c-addr}.  @var{n2} is the length of
   73:     \G the received string. The user indicates the end by pressing
   74:     \G @key{RET}.  Gforth supports all the editing functions available
   75:     \G on the Forth command line (including history and word
   76:     \G completion) in @code{accept}.
   77:     dup 0< -&24 and throw \ use edit-line to edit given strings
   78:     0 edit-line ;

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