File:  [gforth] / gforth / utf-8.fs
Revision 1.1: download - view: text, annotated - select for diffs
Sun Dec 12 20:14:07 2004 UTC (14 years, 10 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Added utf-8 handling

    1: \ UTF-8 handling                                       12dec04py
    2: 
    3: \ Copyright (C) 2004 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 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: \ short: u8 means utf-8 encoded address
   22: 
   23: : u8len ( u -- n )
   24:     dup      $80 u< IF  drop 1  EXIT  THEN \ special case ASCII
   25:     $800  2 >r
   26:     BEGIN  2dup u>=  WHILE  5 lshift r> 1+ >r  REPEAT
   27:     2drop r> ;
   28: 
   29: : u8@+ ( u8addr -- u8addr' u )
   30:     count  dup $80 and 0= ?EXIT  \ special case ASCII
   31:     $7F and  $40 >r
   32:     BEGIN  dup r@ and  WHILE  r@ xor
   33: 	    6 lshift r> 5 lshift >r >r count
   34: \	    dup $C0 and $80 <> abort" malformed character"
   35: 	    $3F and r> or
   36:     REPEAT  rdrop ;
   37: 
   38: : u8!+ ( u u8addr -- u8addr' )
   39:     over $80 < IF  tuck c! 1+  EXIT  THEN \ special case ASCII
   40:     >r 0 swap  $3F
   41:     BEGIN  2dup u>  WHILE
   42: 	    2/ >r  dup $3F and $80 or swap 6 rshift r>
   43:     REPEAT  $7F xor 2* or  r>
   44:     BEGIN   over $80 u>= WHILE  tuck c! 1+  REPEAT  nip ;
   45: 
   46: \ scan to next/previous character
   47: 
   48: : u8>> ( u8addr -- u8addr' )
   49:     BEGIN  count $C0 and $80 <>  UNTIL ;
   50: : u8<< ( u8addr -- u8addr' )
   51:     BEGIN  1- dup c@ $C0 and $80 <>  UNTIL ;
   52: 
   53: \ utf key and emit
   54: 
   55: : u8key ( -- u )
   56:     defers key dup $80 and 0= ?EXIT  \ special case ASCII
   57:     $7F and  $40 >r
   58:     BEGIN  dup r@ and  WHILE  r@ xor
   59: 	    6 lshift r> 5 lshift >r >r defers key
   60: \	    dup $C0 and $80 <> abort" malformed character"
   61: 	    $3F and r> or
   62:     REPEAT  rdrop ;
   63: 
   64: : u8emit ( u -- )
   65:     dup $80 < IF  defers emit  EXIT  THEN \ special case ASCII
   66:     0 swap  $3F
   67:     BEGIN  2dup u>  WHILE
   68: 	    2/ >r  dup $3F and $80 or swap 6 rshift r>
   69:     REPEAT  $7F xor 2* or
   70:     BEGIN   dup $80 u>= WHILE  defers emit  REPEAT  drop ;
   71: 
   72: \ input editor
   73: 
   74: : save-cursor ( -- )  27 emit '7 emit ;
   75: : restore-cursor ( -- )  27 emit '8 emit ;
   76: : .rest ( addr pos1 -- addr pos1 )
   77:     restore-cursor 2dup type ;
   78: : .all ( span addr pos1 -- span addr pos1 )
   79:     restore-cursor >r 2dup swap type r> ;
   80: 
   81: : (u8ins)  ( max span addr pos1 u8char -- max span addr pos2 )
   82:     >r >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop
   83:     r> u8len >r  rot r@ chars + -rot r> chars + .all .rest ;
   84: : u8back  ( max span addr pos1 -- max span addr pos2 f )
   85:     dup  IF  over + u8<< over -  0 max
   86:     ELSE  #bell emit  THEN .rest 0 ;
   87: : u8forw  ( max span addr pos1 -- max span addr pos2 f )
   88:     2 pick over <> IF  over + u8@+ u8emit over -  ELSE  #bell emit  THEN 0 ;
   89: : (u8del)  ( max span addr pos1 -- max span addr pos2 )
   90:     over + dup u8<< tuck - >r over -
   91:     >string over r@ + -rot move
   92:     rot r> - -rot .all 2 spaces .rest ;
   93: : ?u8del ( max span addr pos1 -- max span addr pos2 0 )
   94:   dup  IF  (u8del)  THEN  0 ;
   95: : <u8del> ( max span addr pos1 -- max span addr pos2 0 )
   96:   2 pick over <>
   97: 	IF  u8forw drop (u8del)  ELSE  #bell emit  THEN  0 ;
   98: : u8eof  2 pick over or 0=  IF  bye  ELSE  <u8del>  THEN ;
   99: 
  100: ' u8forw  ctrl F bindkey
  101: ' u8back  ctrl B bindkey
  102: ' ?u8del  ctrl H bindkey
  103: ' u8eof   ctrl D bindkey
  104: ' <u8del> ctrl X bindkey
  105: ' (u8ins) IS insert-char
  106: ' noop IS everychar
  107: ' save-cursor IS everyline
  108: ' u8key IS key
  109: ' u8emit IS emit

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