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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 : | pazsan | 1.7 | s" malformed UTF-8 character" exception Constant UTF-8-err |
| 24 : | |||
| 25 : | anton | 1.13 | $80 Value max-single-byte |
| 26 : | pazsan | 1.10 | |
| 27 : | pazsan | 1.4 | : u8len ( u8 -- n ) |
| 28 : | anton | 1.13 | dup max-single-byte u< IF drop 1 EXIT THEN \ special case ASCII |
| 29 : | pazsan | 1.1 | $800 2 >r |
| 30 : | BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r REPEAT | ||
| 31 : | 2drop r> ; | ||
| 32 : | |||
| 33 : | : u8@+ ( u8addr -- u8addr' u ) | ||
| 34 : | anton | 1.13 | count dup max-single-byte u< ?EXIT \ special case ASCII |
| 35 : | pazsan | 1.1 | $7F and $40 >r |
| 36 : | BEGIN dup r@ and WHILE r@ xor | ||
| 37 : | 6 lshift r> 5 lshift >r >r count | ||
| 38 : | pazsan | 1.7 | dup $C0 and $80 <> IF UTF-8-err throw THEN |
| 39 : | pazsan | 1.1 | $3F and r> or |
| 40 : | REPEAT rdrop ; | ||
| 41 : | |||
| 42 : | : u8!+ ( u u8addr -- u8addr' ) | ||
| 43 : | anton | 1.13 | over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII |
| 44 : | pazsan | 1.1 | >r 0 swap $3F |
| 45 : | BEGIN 2dup u> WHILE | ||
| 46 : | 2/ >r dup $3F and $80 or swap 6 rshift r> | ||
| 47 : | REPEAT $7F xor 2* or r> | ||
| 48 : | BEGIN over $80 u>= WHILE tuck c! 1+ REPEAT nip ; | ||
| 49 : | |||
| 50 : | pazsan | 1.8 | \ plug-in so that char and '<char> work for UTF-8 |
| 51 : | |||
| 52 : | anton | 1.9 | [ifundef] char@ \ !! bootstrapping help |
| 53 : | Defer char@ ( addr u -- char addr' u' ) | ||
| 54 : | :noname over c@ -rot 1 /string ; IS char@ | ||
| 55 : | [then] | ||
| 56 : | |||
| 57 : | pazsan | 1.8 | :noname ( addr u -- char addr' u' ) |
| 58 : | anton | 1.9 | \ !! the if here seems to work around some breakage, but not |
| 59 : | \ entirely; e.g., try 'ç' with LANG=C. | ||
| 60 : | dup 1 u<= IF defers char@ EXIT THEN | ||
| 61 : | pazsan | 1.8 | over + >r u8@+ swap r> over - ; IS char@ |
| 62 : | |||
| 63 : | pazsan | 1.1 | \ scan to next/previous character |
| 64 : | |||
| 65 : | anton | 1.13 | \ alternative names: u8char+ u8char- |
| 66 : | |||
| 67 : | pazsan | 1.12 | : u8>> ( u8addr -- u8addr' ) u8@+ drop ; |
| 68 : | pazsan | 1.1 | : u8<< ( u8addr -- u8addr' ) |
| 69 : | anton | 1.13 | BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ; |
| 70 : | pazsan | 1.1 | |
| 71 : | \ utf key and emit | ||
| 72 : | |||
| 73 : | : u8key ( -- u ) | ||
| 74 : | anton | 1.13 | defers key dup max-single-byte u< ?EXIT \ special case ASCII |
| 75 : | pazsan | 1.1 | $7F and $40 >r |
| 76 : | BEGIN dup r@ and WHILE r@ xor | ||
| 77 : | 6 lshift r> 5 lshift >r >r defers key | ||
| 78 : | pazsan | 1.7 | dup $C0 and $80 <> IF UTF-8-err throw THEN |
| 79 : | pazsan | 1.1 | $3F and r> or |
| 80 : | REPEAT rdrop ; | ||
| 81 : | |||
| 82 : | : u8emit ( u -- ) | ||
| 83 : | anton | 1.13 | dup max-single-byte u< IF defers emit EXIT THEN \ special case ASCII |
| 84 : | pazsan | 1.1 | 0 swap $3F |
| 85 : | BEGIN 2dup u> WHILE | ||
| 86 : | 2/ >r dup $3F and $80 or swap 6 rshift r> | ||
| 87 : | REPEAT $7F xor 2* or | ||
| 88 : | BEGIN dup $80 u>= WHILE defers emit REPEAT drop ; | ||
| 89 : | anton | 1.13 | |
| 90 : | \ utf-8 stuff for xchars | ||
| 91 : | |||
| 92 : | : +u8/string ( c-addr1 u1 -- c-addr2 u2 ) | ||
| 93 : | over dup u8>> swap - /string ; | ||
| 94 : | |||
| 95 : | : -u8/string ( c-addr1 u1 -- c-addr2 u2 ) | ||
| 96 : | over dup u8<< swap - /string ; | ||
| 97 : | |||
| 98 : | : u8@ ( c-addr -- u ) | ||
| 99 : | u8@+ nip ; | ||
| 100 : | |||
| 101 : | : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) | ||
| 102 : | >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 ) | ||
| 103 : | \ not enough space | ||
| 104 : | drop nip r> false | ||
| 105 : | else | ||
| 106 : | >r u8!+ r> r> swap - true | ||
| 107 : | then ; | ||
| 108 : | |||
| 109 : | : u8addrlen ( u8-addr -- u ) | ||
| 110 : | \ length of UTF-8 char starting at u8-addr (accesses only u8-addr) | ||
| 111 : | c@ | ||
| 112 : | dup $80 u< if drop 1 exit endif | ||
| 113 : | dup $c0 u< if UTF-8-err throw endif | ||
| 114 : | dup $e0 u< if drop 2 exit endif | ||
| 115 : | dup $f0 u< if drop 3 exit endif | ||
| 116 : | dup $f8 u< if drop 4 exit endif | ||
| 117 : | dup $fc u< if drop 5 exit endif | ||
| 118 : | dup $fe u< if drop 6 exit endif | ||
| 119 : | UTF-8-err throw ; | ||
| 120 : | |||
| 121 : | : -u8trailing-garbage ( addr u1 -- addr u2 ) | ||
| 122 : | 2dup + dup u8<< ( addr u1 end1 end2 ) | ||
| 123 : | 2dup dup u8addrlen + = if \ last character ok | ||
| 124 : | 2drop | ||
| 125 : | else | ||
| 126 : | nip nip over - | ||
| 127 : | then ; | ||
| 128 : | |||
| 129 : | : set-encoding-utf-8 ( -- ) | ||
| 130 : | ['] u8emit is xemit | ||
| 131 : | ['] u8key is xkey | ||
| 132 : | ['] u8>> is xchar+ | ||
| 133 : | ['] u8<< is xchar- | ||
| 134 : | ['] +u8/string is +x/string | ||
| 135 : | ['] -u8/string is -x/string | ||
| 136 : | ['] u8@ is xc@ | ||
| 137 : | ['] u8!+? is xc!+? | ||
| 138 : | ['] u8@+ is xc@+ | ||
| 139 : | ['] u8len is xc-size | ||
| 140 : | ['] -u8trailing-garbage is -trailing-garbage | ||
| 141 : | ; | ||
| 142 : | pazsan | 1.1 | |
| 143 : | \ input editor | ||
| 144 : | |||
| 145 : | pazsan | 1.7 | [IFUNDEF] #esc 27 Constant #esc [THEN] |
| 146 : | |||
| 147 : | : save-cursor ( -- ) #esc emit '7 emit ; | ||
| 148 : | : restore-cursor ( -- ) #esc emit '8 emit ; | ||
| 149 : | pazsan | 1.1 | : .rest ( addr pos1 -- addr pos1 ) |
| 150 : | restore-cursor 2dup type ; | ||
| 151 : | : .all ( span addr pos1 -- span addr pos1 ) | ||
| 152 : | restore-cursor >r 2dup swap type r> ; | ||
| 153 : | |||
| 154 : | pazsan | 1.3 | : <u8ins> ( max span addr pos1 u8char -- max span addr pos2 ) |
| 155 : | pazsan | 1.6 | >r 2over r@ u8len + u< IF rdrop bell EXIT THEN |
| 156 : | >string over r@ u8len + swap move 2dup chars + r@ swap u8!+ drop | ||
| 157 : | pazsan | 1.3 | r> u8len >r rot r@ chars + -rot r> chars + ; |
| 158 : | pazsan | 1.1 | : (u8ins) ( max span addr pos1 u8char -- max span addr pos2 ) |
| 159 : | pazsan | 1.3 | <u8ins> .all .rest ; |
| 160 : | pazsan | 1.1 | : u8back ( max span addr pos1 -- max span addr pos2 f ) |
| 161 : | pazsan | 1.2 | dup IF over + u8<< over - 0 max .all .rest |
| 162 : | pazsan | 1.6 | ELSE bell THEN 0 ; |
| 163 : | pazsan | 1.1 | : u8forw ( max span addr pos1 -- max span addr pos2 f ) |
| 164 : | pazsan | 1.6 | 2 pick over <> IF over + u8@+ u8emit over - ELSE bell THEN 0 ; |
| 165 : | pazsan | 1.1 | : (u8del) ( max span addr pos1 -- max span addr pos2 ) |
| 166 : | over + dup u8<< tuck - >r over - | ||
| 167 : | >string over r@ + -rot move | ||
| 168 : | pazsan | 1.3 | rot r> - -rot ; |
| 169 : | pazsan | 1.1 | : ?u8del ( max span addr pos1 -- max span addr pos2 0 ) |
| 170 : | pazsan | 1.3 | dup IF (u8del) .all 2 spaces .rest THEN 0 ; |
| 171 : | pazsan | 1.1 | : <u8del> ( max span addr pos1 -- max span addr pos2 0 ) |
| 172 : | 2 pick over <> | ||
| 173 : | pazsan | 1.3 | IF u8forw drop (u8del) .all 2 spaces .rest |
| 174 : | pazsan | 1.6 | ELSE bell THEN 0 ; |
| 175 : | pazsan | 1.1 | : u8eof 2 pick over or 0= IF bye ELSE <u8del> THEN ; |
| 176 : | |||
| 177 : | pazsan | 1.3 | : u8first-pos ( max span addr pos1 -- max span addr 0 0 ) |
| 178 : | drop 0 .all .rest 0 ; | ||
| 179 : | : u8end-pos ( max span addr pos1 -- max span addr span 0 ) | ||
| 180 : | drop over .all 0 ; | ||
| 181 : | |||
| 182 : | |||
| 183 : | : u8clear-line ( max span addr pos1 -- max addr ) | ||
| 184 : | drop restore-cursor swap spaces restore-cursor ; | ||
| 185 : | : u8clear-tib ( max span addr pos -- max 0 addr 0 false ) | ||
| 186 : | u8clear-line 0 tuck dup ; | ||
| 187 : | |||
| 188 : | : (u8enter) ( max span addr pos1 -- max span addr pos2 true ) | ||
| 189 : | >r end^ 2@ hist-setpos | ||
| 190 : | 2dup swap history write-line drop ( throw ) \ don't worry about errors | ||
| 191 : | hist-pos 2dup backward^ 2! end^ 2! | ||
| 192 : | r> .all space true ; | ||
| 193 : | |||
| 194 : | : u8kill-expand ( max span addr pos1 -- max span addr pos2 ) | ||
| 195 : | prefix-found cell+ @ ?dup IF >r | ||
| 196 : | r@ - >string over r@ + -rot move | ||
| 197 : | rot r@ - -rot .all r> spaces .rest THEN ; | ||
| 198 : | |||
| 199 : | : insert ( string length buffer size -- ) | ||
| 200 : | rot over min >r r@ - ( left over ) | ||
| 201 : | over dup r@ + rot move r> move ; | ||
| 202 : | |||
| 203 : | : u8tab-expand ( max span addr pos1 -- max span addr pos2 0 ) | ||
| 204 : | key? IF #tab (u8ins) 0 EXIT THEN | ||
| 205 : | u8kill-expand 2dup extract-word dup 0= IF nip EXIT THEN | ||
| 206 : | pazsan | 1.5 | search-prefix tib-full? |
| 207 : | IF 7 emit 2drop prefix-off | ||
| 208 : | pazsan | 1.3 | ELSE dup >r |
| 209 : | 2>r >string r@ + 2r> 2swap insert | ||
| 210 : | r@ + rot r> + -rot | ||
| 211 : | THEN | ||
| 212 : | pazsan | 1.5 | prefix-found @ IF bl (u8ins) ELSE .all .rest THEN 0 ; |
| 213 : | pazsan | 1.3 | |
| 214 : | pazsan | 1.4 | : utf-8-io ( -- ) |
| 215 : | ['] u8forw ctrl F bindkey | ||
| 216 : | ['] u8back ctrl B bindkey | ||
| 217 : | ['] ?u8del ctrl H bindkey | ||
| 218 : | ['] u8eof ctrl D bindkey | ||
| 219 : | ['] <u8del> ctrl X bindkey | ||
| 220 : | ['] u8clear-tib ctrl K bindkey | ||
| 221 : | ['] u8first-pos ctrl A bindkey | ||
| 222 : | ['] u8end-pos ctrl E bindkey | ||
| 223 : | ['] (u8enter) #lf bindkey | ||
| 224 : | ['] (u8enter) #cr bindkey | ||
| 225 : | ['] u8tab-expand #tab bindkey | ||
| 226 : | ['] (u8ins) IS insert-char | ||
| 227 : | pazsan | 1.5 | ['] kill-prefix IS everychar |
| 228 : | pazsan | 1.4 | ['] save-cursor IS everyline |
| 229 : | ['] u8key IS key | ||
| 230 : | ['] u8emit IS emit ; | ||
| 231 : |
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