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| 1 : | pazsan | 1.1 | \ UTF-8 handling 12dec04py |
| 2 : | |||
| 3 : | anton | 1.18 | \ Copyright (C) 2004,2005 Free Software Foundation, Inc. |
| 4 : | pazsan | 1.1 | |
| 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 : | pazsan | 1.17 | BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r dup 0= UNTIL THEN |
| 31 : | pazsan | 1.1 | 2drop r> ; |
| 32 : | |||
| 33 : | : u8@+ ( u8addr -- u8addr' u ) | ||
| 34 : | anton | 1.13 | count dup max-single-byte u< ?EXIT \ special case ASCII |
| 35 : | pazsan | 1.17 | dup $C2 u< IF UTF-8-err throw THEN \ malformed character |
| 36 : | pazsan | 1.1 | $7F and $40 >r |
| 37 : | BEGIN dup r@ and WHILE r@ xor | ||
| 38 : | 6 lshift r> 5 lshift >r >r count | ||
| 39 : | pazsan | 1.7 | dup $C0 and $80 <> IF UTF-8-err throw THEN |
| 40 : | pazsan | 1.1 | $3F and r> or |
| 41 : | REPEAT rdrop ; | ||
| 42 : | |||
| 43 : | : u8!+ ( u u8addr -- u8addr' ) | ||
| 44 : | anton | 1.13 | over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII |
| 45 : | pazsan | 1.1 | >r 0 swap $3F |
| 46 : | BEGIN 2dup u> WHILE | ||
| 47 : | 2/ >r dup $3F and $80 or swap 6 rshift r> | ||
| 48 : | REPEAT $7F xor 2* or r> | ||
| 49 : | BEGIN over $80 u>= WHILE tuck c! 1+ REPEAT nip ; | ||
| 50 : | |||
| 51 : | pazsan | 1.8 | \ plug-in so that char and '<char> work for UTF-8 |
| 52 : | |||
| 53 : | anton | 1.9 | [ifundef] char@ \ !! bootstrapping help |
| 54 : | Defer char@ ( addr u -- char addr' u' ) | ||
| 55 : | :noname over c@ -rot 1 /string ; IS char@ | ||
| 56 : | [then] | ||
| 57 : | |||
| 58 : | pazsan | 1.8 | :noname ( addr u -- char addr' u' ) |
| 59 : | anton | 1.9 | \ !! the if here seems to work around some breakage, but not |
| 60 : | \ entirely; e.g., try 'ç' with LANG=C. | ||
| 61 : | dup 1 u<= IF defers char@ EXIT THEN | ||
| 62 : | pazsan | 1.8 | over + >r u8@+ swap r> over - ; IS char@ |
| 63 : | |||
| 64 : | pazsan | 1.1 | \ scan to next/previous character |
| 65 : | |||
| 66 : | anton | 1.13 | \ alternative names: u8char+ u8char- |
| 67 : | |||
| 68 : | pazsan | 1.12 | : u8>> ( u8addr -- u8addr' ) u8@+ drop ; |
| 69 : | pazsan | 1.1 | : u8<< ( u8addr -- u8addr' ) |
| 70 : | anton | 1.13 | BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ; |
| 71 : | pazsan | 1.1 | |
| 72 : | \ utf key and emit | ||
| 73 : | |||
| 74 : | : u8key ( -- u ) | ||
| 75 : | anton | 1.13 | defers key dup max-single-byte u< ?EXIT \ special case ASCII |
| 76 : | pazsan | 1.17 | dup $C2 u< IF UTF-8-err throw THEN \ malformed character |
| 77 : | pazsan | 1.1 | $7F and $40 >r |
| 78 : | BEGIN dup r@ and WHILE r@ xor | ||
| 79 : | 6 lshift r> 5 lshift >r >r defers key | ||
| 80 : | pazsan | 1.7 | dup $C0 and $80 <> IF UTF-8-err throw THEN |
| 81 : | pazsan | 1.1 | $3F and r> or |
| 82 : | REPEAT rdrop ; | ||
| 83 : | |||
| 84 : | : u8emit ( u -- ) | ||
| 85 : | anton | 1.13 | dup max-single-byte u< IF defers emit EXIT THEN \ special case ASCII |
| 86 : | pazsan | 1.1 | 0 swap $3F |
| 87 : | BEGIN 2dup u> WHILE | ||
| 88 : | 2/ >r dup $3F and $80 or swap 6 rshift r> | ||
| 89 : | REPEAT $7F xor 2* or | ||
| 90 : | BEGIN dup $80 u>= WHILE defers emit REPEAT drop ; | ||
| 91 : | anton | 1.13 | |
| 92 : | \ utf-8 stuff for xchars | ||
| 93 : | |||
| 94 : | : +u8/string ( c-addr1 u1 -- c-addr2 u2 ) | ||
| 95 : | over dup u8>> swap - /string ; | ||
| 96 : | |||
| 97 : | : -u8/string ( c-addr1 u1 -- c-addr2 u2 ) | ||
| 98 : | over dup u8<< swap - /string ; | ||
| 99 : | |||
| 100 : | : u8@ ( c-addr -- u ) | ||
| 101 : | u8@+ nip ; | ||
| 102 : | |||
| 103 : | : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) | ||
| 104 : | >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 ) | ||
| 105 : | \ not enough space | ||
| 106 : | drop nip r> false | ||
| 107 : | else | ||
| 108 : | >r u8!+ r> r> swap - true | ||
| 109 : | then ; | ||
| 110 : | |||
| 111 : | : u8addrlen ( u8-addr -- u ) | ||
| 112 : | \ length of UTF-8 char starting at u8-addr (accesses only u8-addr) | ||
| 113 : | c@ | ||
| 114 : | dup $80 u< if drop 1 exit endif | ||
| 115 : | dup $c0 u< if UTF-8-err throw endif | ||
| 116 : | dup $e0 u< if drop 2 exit endif | ||
| 117 : | dup $f0 u< if drop 3 exit endif | ||
| 118 : | dup $f8 u< if drop 4 exit endif | ||
| 119 : | dup $fc u< if drop 5 exit endif | ||
| 120 : | dup $fe u< if drop 6 exit endif | ||
| 121 : | UTF-8-err throw ; | ||
| 122 : | |||
| 123 : | : -u8trailing-garbage ( addr u1 -- addr u2 ) | ||
| 124 : | 2dup + dup u8<< ( addr u1 end1 end2 ) | ||
| 125 : | 2dup dup u8addrlen + = if \ last character ok | ||
| 126 : | 2drop | ||
| 127 : | else | ||
| 128 : | nip nip over - | ||
| 129 : | then ; | ||
| 130 : | |||
| 131 : | anton | 1.22 | [IFUNDEF] wcwidth |
| 132 : | : wcwidth abort ; | ||
| 133 : | [THEN] | ||
| 134 : | |||
| 135 : | pazsan | 1.19 | : u8width ( xcaddr u -- n ) |
| 136 : | 0 rot rot over + swap ?DO | ||
| 137 : | anton | 1.22 | I xc@+ swap >r wcwidth + |
| 138 : | pazsan | 1.19 | r> I - +LOOP ; |
| 139 : | |||
| 140 : | anton | 1.13 | : set-encoding-utf-8 ( -- ) |
| 141 : | ['] u8emit is xemit | ||
| 142 : | ['] u8key is xkey | ||
| 143 : | ['] u8>> is xchar+ | ||
| 144 : | ['] u8<< is xchar- | ||
| 145 : | ['] +u8/string is +x/string | ||
| 146 : | ['] -u8/string is -x/string | ||
| 147 : | ['] u8@ is xc@ | ||
| 148 : | ['] u8!+? is xc!+? | ||
| 149 : | ['] u8@+ is xc@+ | ||
| 150 : | ['] u8len is xc-size | ||
| 151 : | pazsan | 1.20 | [ [IFDEF] x-width ] |
| 152 : | pazsan | 1.19 | ['] u8width is x-width |
| 153 : | pazsan | 1.20 | [ [THEN] ] |
| 154 : | anton | 1.13 | ['] -u8trailing-garbage is -trailing-garbage |
| 155 : | ; | ||
| 156 : | pazsan | 1.1 | |
| 157 : | anton | 1.15 | : utf-8-cold ( -- ) |
| 158 : | pazsan | 1.16 | s" LC_ALL" getenv 2dup d0= IF 2drop |
| 159 : | s" LC_CTYPE" getenv 2dup d0= IF 2drop | ||
| 160 : | s" LANG" getenv 2dup d0= IF 2drop | ||
| 161 : | s" C" THEN THEN THEN | ||
| 162 : | s" UTF-8" search nip nip | ||
| 163 : | anton | 1.15 | IF set-encoding-utf-8 ELSE set-encoding-fixed-width THEN ; |
| 164 : | |||
| 165 : | ' utf-8-cold INIT8 chained | ||
| 166 : | |||
| 167 : | utf-8-cold |
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