Annotation of gforth/utf-8.fs, revision 1.6
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:
1.4 pazsan 23: : u8len ( u8 -- n )
1.1 pazsan 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:
1.3 pazsan 81: : <u8ins> ( max span addr pos1 u8char -- max span addr pos2 )
1.6 ! pazsan 82: >r 2over r@ u8len + u< IF rdrop bell EXIT THEN
! 83: >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop
1.3 pazsan 84: r> u8len >r rot r@ chars + -rot r> chars + ;
1.1 pazsan 85: : (u8ins) ( max span addr pos1 u8char -- max span addr pos2 )
1.3 pazsan 86: <u8ins> .all .rest ;
1.1 pazsan 87: : u8back ( max span addr pos1 -- max span addr pos2 f )
1.2 pazsan 88: dup IF over + u8<< over - 0 max .all .rest
1.6 ! pazsan 89: ELSE bell THEN 0 ;
1.1 pazsan 90: : u8forw ( max span addr pos1 -- max span addr pos2 f )
1.6 ! pazsan 91: 2 pick over <> IF over + u8@+ u8emit over - ELSE bell THEN 0 ;
1.1 pazsan 92: : (u8del) ( max span addr pos1 -- max span addr pos2 )
93: over + dup u8<< tuck - >r over -
94: >string over r@ + -rot move
1.3 pazsan 95: rot r> - -rot ;
1.1 pazsan 96: : ?u8del ( max span addr pos1 -- max span addr pos2 0 )
1.3 pazsan 97: dup IF (u8del) .all 2 spaces .rest THEN 0 ;
1.1 pazsan 98: : <u8del> ( max span addr pos1 -- max span addr pos2 0 )
99: 2 pick over <>
1.3 pazsan 100: IF u8forw drop (u8del) .all 2 spaces .rest
1.6 ! pazsan 101: ELSE bell THEN 0 ;
1.1 pazsan 102: : u8eof 2 pick over or 0= IF bye ELSE <u8del> THEN ;
103:
1.3 pazsan 104: : u8first-pos ( max span addr pos1 -- max span addr 0 0 )
105: drop 0 .all .rest 0 ;
106: : u8end-pos ( max span addr pos1 -- max span addr span 0 )
107: drop over .all 0 ;
108:
109:
110: : u8clear-line ( max span addr pos1 -- max addr )
111: drop restore-cursor swap spaces restore-cursor ;
112: : u8clear-tib ( max span addr pos -- max 0 addr 0 false )
113: u8clear-line 0 tuck dup ;
114:
115: : (u8enter) ( max span addr pos1 -- max span addr pos2 true )
116: >r end^ 2@ hist-setpos
117: 2dup swap history write-line drop ( throw ) \ don't worry about errors
118: hist-pos 2dup backward^ 2! end^ 2!
119: r> .all space true ;
120:
121: : u8kill-expand ( max span addr pos1 -- max span addr pos2 )
122: prefix-found cell+ @ ?dup IF >r
123: r@ - >string over r@ + -rot move
124: rot r@ - -rot .all r> spaces .rest THEN ;
125:
126: : insert ( string length buffer size -- )
127: rot over min >r r@ - ( left over )
128: over dup r@ + rot move r> move ;
129:
130: : u8tab-expand ( max span addr pos1 -- max span addr pos2 0 )
131: key? IF #tab (u8ins) 0 EXIT THEN
132: u8kill-expand 2dup extract-word dup 0= IF nip EXIT THEN
1.5 pazsan 133: search-prefix tib-full?
134: IF 7 emit 2drop prefix-off
1.3 pazsan 135: ELSE dup >r
136: 2>r >string r@ + 2r> 2swap insert
137: r@ + rot r> + -rot
138: THEN
1.5 pazsan 139: prefix-found @ IF bl (u8ins) ELSE .all .rest THEN 0 ;
1.3 pazsan 140:
1.4 pazsan 141: : utf-8-io ( -- )
142: ['] u8forw ctrl F bindkey
143: ['] u8back ctrl B bindkey
144: ['] ?u8del ctrl H bindkey
145: ['] u8eof ctrl D bindkey
146: ['] <u8del> ctrl X bindkey
147: ['] u8clear-tib ctrl K bindkey
148: ['] u8first-pos ctrl A bindkey
149: ['] u8end-pos ctrl E bindkey
150: ['] (u8enter) #lf bindkey
151: ['] (u8enter) #cr bindkey
152: ['] u8tab-expand #tab bindkey
153: ['] (u8ins) IS insert-char
1.5 pazsan 154: ['] kill-prefix IS everychar
1.4 pazsan 155: ['] save-cursor IS everyline
156: ['] u8key IS key
157: ['] u8emit IS emit ;
158:
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