Annotation of gforth/utf-8.fs, revision 1.2
1.1 pazsan 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 )
1.2 ! pazsan 85: dup IF over + u8<< over - 0 max .all .rest
! 86: ELSE #bell emit THEN 0 ;
1.1 pazsan 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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