\ UTF-8 handling 12dec04py \ Copyright (C) 2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc. \ This file is part of Gforth. \ Gforth is free software; you can redistribute it and/or \ modify it under the terms of the GNU General Public License \ as published by the Free Software Foundation, either version 3 \ of the License, or (at your option) any later version. \ This program is distributed in the hope that it will be useful, \ but WITHOUT ANY WARRANTY; without even the implied warranty of \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the \ GNU General Public License for more details. \ You should have received a copy of the GNU General Public License \ along with this program. If not, see http://www.gnu.org/licenses/. \ short: u8 means utf-8 encoded address s" malformed UTF-8 character" exception Constant UTF-8-err $80 Value max-single-byte : u8len ( u8 -- n ) dup max-single-byte u< IF drop 1 EXIT THEN \ special case ASCII $800 2 >r BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r dup 0= UNTIL THEN 2drop r> ; : u8@+ ( u8addr -- u8addr' u ) count dup max-single-byte u< ?EXIT \ special case ASCII dup $C2 u< IF UTF-8-err throw THEN \ malformed character $7F and $40 >r BEGIN dup r@ and WHILE r@ xor 6 lshift r> 5 lshift >r >r count dup $C0 and $80 <> IF UTF-8-err throw THEN $3F and r> or REPEAT rdrop ; : u8!+ ( u u8addr -- u8addr' ) over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII >r 0 swap $3F BEGIN 2dup u> WHILE 2/ >r dup $3F and $80 or swap 6 rshift r> REPEAT $7F xor 2* or r> BEGIN over $80 u>= WHILE tuck c! 1+ REPEAT nip ; \ plug-in so that char and ' work for UTF-8 [ifundef] char@ \ !! bootstrapping help Defer char@ ( addr u -- char addr' u' ) :noname over c@ -rot 1 /string ; IS char@ [then] :noname ( addr u -- char addr' u' ) \ !! the if here seems to work around some breakage, but not \ entirely; e.g., try 'ç' with LANG=C. dup 1 u<= IF defers char@ EXIT THEN over + >r u8@+ swap r> over - ; IS char@ \ scan to next/previous character \ alternative names: u8char+ u8char- : u8>> ( u8addr -- u8addr' ) u8@+ drop ; : u8<< ( u8addr -- u8addr' ) BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ; \ utf key and emit Defer check-xy ' noop IS check-xy : u8key ( -- u ) key dup max-single-byte u< ?EXIT \ special case ASCII dup $FF = ?EXIT \ special resize character dup $C2 u< IF UTF-8-err throw THEN \ malformed character $7F and $40 >r BEGIN dup r@ and WHILE r@ xor 6 lshift r> 5 lshift >r >r key dup $C0 and $80 <> IF UTF-8-err throw THEN $3F and r> or REPEAT rdrop ; : u8emit ( u -- ) dup max-single-byte u< IF emit EXIT THEN \ special case ASCII 0 swap $3F BEGIN 2dup u> WHILE 2/ >r dup $3F and $80 or swap 6 rshift r> REPEAT $7F xor 2* or BEGIN dup $80 u>= WHILE emit REPEAT drop ; \ utf-8 stuff for xchars : +u8/string ( xc-addr1 u1 -- xc-addr2 u2 ) over dup u8>> swap - /string ; : u8\string- ( xcaddr u -- xcaddr u' ) over + u8<< over - ; : u8@ ( c-addr -- u ) u8@+ nip ; : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 ) \ not enough space drop nip r> false else >r u8!+ r> r> swap - true then ; : u8addrlen ( u8-addr u -- u ) drop \ length of UTF-8 char starting at u8-addr (accesses only u8-addr) c@ dup $80 u< if drop 1 exit endif dup $c0 u< if UTF-8-err throw endif dup $e0 u< if drop 2 exit endif dup $f0 u< if drop 3 exit endif dup $f8 u< if drop 4 exit endif dup $fc u< if drop 5 exit endif dup $fe u< if drop 6 exit endif dup $ff u< if drop 7 exit endif drop 8 ; : -u8trailing-garbage ( addr u1 -- addr u2 ) 2dup + dup u8<< ( addr u1 end1 end2 ) 2dup dup over over - u8addrlen + = if \ last character ok 2drop else nip nip over - then ; [IFUNDEF] wcwidth : wc,3 ( n low high -- ) 1+ , , , ; Create wc-table \ derived from wcwidth source code, for UCS32 0 $0300 $0357 wc,3 0 $035D $036F wc,3 0 $0483 $0486 wc,3 0 $0488 $0489 wc,3 0 $0591 $05A1 wc,3 0 $05A3 $05B9 wc,3 0 $05BB $05BD wc,3 0 $05BF $05BF wc,3 0 $05C1 $05C2 wc,3 0 $05C4 $05C4 wc,3 0 $0600 $0603 wc,3 0 $0610 $0615 wc,3 0 $064B $0658 wc,3 0 $0670 $0670 wc,3 0 $06D6 $06E4 wc,3 0 $06E7 $06E8 wc,3 0 $06EA $06ED wc,3 0 $070F $070F wc,3 0 $0711 $0711 wc,3 0 $0730 $074A wc,3 0 $07A6 $07B0 wc,3 0 $0901 $0902 wc,3 0 $093C $093C wc,3 0 $0941 $0948 wc,3 0 $094D $094D wc,3 0 $0951 $0954 wc,3 0 $0962 $0963 wc,3 0 $0981 $0981 wc,3 0 $09BC $09BC wc,3 0 $09C1 $09C4 wc,3 0 $09CD $09CD wc,3 0 $09E2 $09E3 wc,3 0 $0A01 $0A02 wc,3 0 $0A3C $0A3C wc,3 0 $0A41 $0A42 wc,3 0 $0A47 $0A48 wc,3 0 $0A4B $0A4D wc,3 0 $0A70 $0A71 wc,3 0 $0A81 $0A82 wc,3 0 $0ABC $0ABC wc,3 0 $0AC1 $0AC5 wc,3 0 $0AC7 $0AC8 wc,3 0 $0ACD $0ACD wc,3 0 $0AE2 $0AE3 wc,3 0 $0B01 $0B01 wc,3 0 $0B3C $0B3C wc,3 0 $0B3F $0B3F wc,3 0 $0B41 $0B43 wc,3 0 $0B4D $0B4D wc,3 0 $0B56 $0B56 wc,3 0 $0B82 $0B82 wc,3 0 $0BC0 $0BC0 wc,3 0 $0BCD $0BCD wc,3 0 $0C3E $0C40 wc,3 0 $0C46 $0C48 wc,3 0 $0C4A $0C4D wc,3 0 $0C55 $0C56 wc,3 0 $0CBC $0CBC wc,3 0 $0CBF $0CBF wc,3 0 $0CC6 $0CC6 wc,3 0 $0CCC $0CCD wc,3 0 $0D41 $0D43 wc,3 0 $0D4D $0D4D wc,3 0 $0DCA $0DCA wc,3 0 $0DD2 $0DD4 wc,3 0 $0DD6 $0DD6 wc,3 0 $0E31 $0E31 wc,3 0 $0E34 $0E3A wc,3 0 $0E47 $0E4E wc,3 0 $0EB1 $0EB1 wc,3 0 $0EB4 $0EB9 wc,3 0 $0EBB $0EBC wc,3 0 $0EC8 $0ECD wc,3 0 $0F18 $0F19 wc,3 0 $0F35 $0F35 wc,3 0 $0F37 $0F37 wc,3 0 $0F39 $0F39 wc,3 0 $0F71 $0F7E wc,3 0 $0F80 $0F84 wc,3 0 $0F86 $0F87 wc,3 0 $0F90 $0F97 wc,3 0 $0F99 $0FBC wc,3 0 $0FC6 $0FC6 wc,3 0 $102D $1030 wc,3 0 $1032 $1032 wc,3 0 $1036 $1037 wc,3 0 $1039 $1039 wc,3 0 $1058 $1059 wc,3 1 $0000 $1100 wc,3 2 $1100 $115f wc,3 0 $1160 $11FF wc,3 0 $1712 $1714 wc,3 0 $1732 $1734 wc,3 0 $1752 $1753 wc,3 0 $1772 $1773 wc,3 0 $17B4 $17B5 wc,3 0 $17B7 $17BD wc,3 0 $17C6 $17C6 wc,3 0 $17C9 $17D3 wc,3 0 $17DD $17DD wc,3 0 $180B $180D wc,3 0 $18A9 $18A9 wc,3 0 $1920 $1922 wc,3 0 $1927 $1928 wc,3 0 $1932 $1932 wc,3 0 $1939 $193B wc,3 0 $200B $200F wc,3 0 $202A $202E wc,3 0 $2060 $2063 wc,3 0 $206A $206F wc,3 0 $20D0 $20EA wc,3 2 $2329 $232A wc,3 0 $302A $302F wc,3 2 $2E80 $303E wc,3 0 $3099 $309A wc,3 2 $3040 $A4CF wc,3 2 $AC00 $D7A3 wc,3 2 $F900 $FAFF wc,3 0 $FB1E $FB1E wc,3 0 $FE00 $FE0F wc,3 0 $FE20 $FE23 wc,3 2 $FE30 $FE6F wc,3 0 $FEFF $FEFF wc,3 2 $FF00 $FF60 wc,3 2 $FFE0 $FFE6 wc,3 0 $FFF9 $FFFB wc,3 0 $1D167 $1D169 wc,3 0 $1D173 $1D182 wc,3 0 $1D185 $1D18B wc,3 0 $1D1AA $1D1AD wc,3 2 $20000 $2FFFD wc,3 2 $30000 $3FFFD wc,3 0 $E0001 $E0001 wc,3 0 $E0020 $E007F wc,3 0 $E0100 $E01EF wc,3 here wc-table - Constant #wc-table \ inefficient table walk: : xc-width ( xc -- n ) wc-table #wc-table over + swap ?DO dup I 2@ within IF I 2 cells + @ UNLOOP EXIT THEN 3 cells +LOOP 1 ; [ELSE] ' wcwidth Alias xc-width [THEN] : u8width ( xcaddr u -- n ) 0 rot rot over + swap ?DO I xc@+ swap >r xc-width + r> I - +LOOP ; : set-encoding-utf-8 ( -- ) ['] u8emit is xemit ['] u8key is xkey ['] u8>> is xchar+ ['] u8<< is xchar- [ [IFDEF] xstring+ ] ['] u8\string- is xstring- ['] +u8/string is +xstring [ [THEN] ] [ [IFDEF] +x/string ] ['] u8\string- is x\string- ['] +u8/string is +x/string [ [THEN] ] ['] u8@ is xc@ ['] u8!+? is xc!+? ['] u8@+ is xc@+ ['] u8len is xc-size [ [IFDEF] x-width ] ['] u8width is x-width [ [THEN] ] [ [IFDEF] x-size ] ['] u8addrlen is x-size [ [THEN] ] ['] -u8trailing-garbage is -trailing-garbage ; : utf-8-cold ( -- ) s" LC_ALL" getenv 2dup d0= IF 2drop s" LC_CTYPE" getenv 2dup d0= IF 2drop s" LANG" getenv 2dup d0= IF 2drop s" C" THEN THEN THEN s" UTF-8" search nip nip IF set-encoding-utf-8 ELSE set-encoding-fixed-width THEN ; environment-wordlist set-current : xchar-encoding ( -- addr u ) \ xchar-ext \G Returns a printable ASCII string that reperesents the encoding, \G and use the preferred MIME name (if any) or the name in \G @url{http://www.iana.org/assignments/character-sets} like \G ``ISO-LATIN-1'' or ``UTF-8'', with the exception of ``ASCII'', where \G we prefer the alias ``ASCII''. max-single-byte $80 = IF s" UTF-8" ELSE s" ISO-LATIN-1" THEN ; : max-xchar ( -- xchar ) max-single-byte $80 = IF $7FFFFFFF ELSE $FF THEN ; ' noop Alias X:xchar forth definitions :noname ( -- ) defers 'cold utf-8-cold ; is 'cold utf-8-cold