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| 1 : | pazsan | 1.1 | \ 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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