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File: [gforth] / gforth / utf-8.fs
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Tue Jul 15 16:11:49 2008 UTC (15 years, 4 months ago) by anton
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updated copyright years
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1: \ UTF-8 handling 12dec04py 2: 3: \ Copyright (C) 2004,2005,2006,2007,2008 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 3 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, see http://www.gnu.org/licenses/. 19: 20: \ short: u8 means utf-8 encoded address 21: 22: s" malformed UTF-8 character" exception Constant UTF-8-err 23: 24: $80 Value max-single-byte 25: 26: : u8len ( u8 -- n ) 27: dup max-single-byte u< IF drop 1 EXIT THEN \ special case ASCII 28: $800 2 >r 29: BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r dup 0= UNTIL THEN 30: 2drop r> ; 31: 32: : u8@+ ( u8addr -- u8addr' u ) 33: count dup max-single-byte u< ?EXIT \ special case ASCII 34: dup $C2 u< IF UTF-8-err throw THEN \ malformed character 35: $7F and $40 >r 36: BEGIN dup r@ and WHILE r@ xor 37: 6 lshift r> 5 lshift >r >r count 38: dup $C0 and $80 <> IF UTF-8-err throw THEN 39: $3F and r> or 40: REPEAT rdrop ; 41: 42: : u8!+ ( u u8addr -- u8addr' ) 43: over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII 44: >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: \ plug-in so that char and '<char> work for UTF-8 51: 52: [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: :noname ( addr u -- char addr' u' ) 58: \ !! 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: over + >r u8@+ swap r> over - ; IS char@ 62: 63: \ scan to next/previous character 64: 65: \ alternative names: u8char+ u8char- 66: 67: : u8>> ( u8addr -- u8addr' ) u8@+ drop ; 68: : u8<< ( u8addr -- u8addr' ) 69: BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ; 70: 71: \ utf key and emit 72: 73: Defer check-xy ' noop IS check-xy 74: 75: : u8key ( -- u ) 76: defers key dup max-single-byte u< ?EXIT \ special case ASCII 77: dup $FF = ?EXIT \ special resize character 78: dup $C2 u< IF UTF-8-err throw THEN \ malformed character 79: $7F and $40 >r 80: BEGIN dup r@ and WHILE r@ xor 81: 6 lshift r> 5 lshift >r >r defers key 82: dup $C0 and $80 <> IF UTF-8-err throw THEN 83: $3F and r> or 84: REPEAT rdrop ; 85: 86: : u8emit ( u -- ) 87: dup max-single-byte u< IF defers emit EXIT THEN \ special case ASCII 88: 0 swap $3F 89: BEGIN 2dup u> WHILE 90: 2/ >r dup $3F and $80 or swap 6 rshift r> 91: REPEAT $7F xor 2* or 92: BEGIN dup $80 u>= WHILE defers emit REPEAT drop ; 93: 94: \ utf-8 stuff for xchars 95: 96: : +u8/string ( xc-addr1 u1 -- xc-addr2 u2 ) 97: over dup u8>> swap - /string ; 98: : u8\string- ( xcaddr u -- xcaddr u' ) 99: over + u8<< over - ; 100: 101: : u8@ ( c-addr -- u ) 102: u8@+ nip ; 103: 104: : u8!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) 105: >r over u8len r@ over u< if ( xc xc-addr1 len r: u1 ) 106: \ not enough space 107: drop nip r> false 108: else 109: >r u8!+ r> r> swap - true 110: then ; 111: 112: : u8addrlen ( u8-addr u -- u ) drop 113: \ length of UTF-8 char starting at u8-addr (accesses only u8-addr) 114: c@ 115: dup $80 u< if drop 1 exit endif 116: dup $c0 u< if UTF-8-err throw endif 117: dup $e0 u< if drop 2 exit endif 118: dup $f0 u< if drop 3 exit endif 119: dup $f8 u< if drop 4 exit endif 120: dup $fc u< if drop 5 exit endif 121: dup $fe u< if drop 6 exit endif 122: UTF-8-err throw ; 123: 124: : -u8trailing-garbage ( addr u1 -- addr u2 ) 125: 2dup + dup u8<< ( addr u1 end1 end2 ) 126: 2dup dup over over - u8addrlen + = if \ last character ok 127: 2drop 128: else 129: nip nip over - 130: then ; 131: 132: [IFUNDEF] wcwidth 133: : wc,3 ( n low high -- ) 1+ , , , ; 134: 135: Create wc-table \ derived from wcwidth source code, for UCS32 136: 0 $0300 $0357 wc,3 137: 0 $035D $036F wc,3 138: 0 $0483 $0486 wc,3 139: 0 $0488 $0489 wc,3 140: 0 $0591 $05A1 wc,3 141: 0 $05A3 $05B9 wc,3 142: 0 $05BB $05BD wc,3 143: 0 $05BF $05BF wc,3 144: 0 $05C1 $05C2 wc,3 145: 0 $05C4 $05C4 wc,3 146: 0 $0600 $0603 wc,3 147: 0 $0610 $0615 wc,3 148: 0 $064B $0658 wc,3 149: 0 $0670 $0670 wc,3 150: 0 $06D6 $06E4 wc,3 151: 0 $06E7 $06E8 wc,3 152: 0 $06EA $06ED wc,3 153: 0 $070F $070F wc,3 154: 0 $0711 $0711 wc,3 155: 0 $0730 $074A wc,3 156: 0 $07A6 $07B0 wc,3 157: 0 $0901 $0902 wc,3 158: 0 $093C $093C wc,3 159: 0 $0941 $0948 wc,3 160: 0 $094D $094D wc,3 161: 0 $0951 $0954 wc,3 162: 0 $0962 $0963 wc,3 163: 0 $0981 $0981 wc,3 164: 0 $09BC $09BC wc,3 165: 0 $09C1 $09C4 wc,3 166: 0 $09CD $09CD wc,3 167: 0 $09E2 $09E3 wc,3 168: 0 $0A01 $0A02 wc,3 169: 0 $0A3C $0A3C wc,3 170: 0 $0A41 $0A42 wc,3 171: 0 $0A47 $0A48 wc,3 172: 0 $0A4B $0A4D wc,3 173: 0 $0A70 $0A71 wc,3 174: 0 $0A81 $0A82 wc,3 175: 0 $0ABC $0ABC wc,3 176: 0 $0AC1 $0AC5 wc,3 177: 0 $0AC7 $0AC8 wc,3 178: 0 $0ACD $0ACD wc,3 179: 0 $0AE2 $0AE3 wc,3 180: 0 $0B01 $0B01 wc,3 181: 0 $0B3C $0B3C wc,3 182: 0 $0B3F $0B3F wc,3 183: 0 $0B41 $0B43 wc,3 184: 0 $0B4D $0B4D wc,3 185: 0 $0B56 $0B56 wc,3 186: 0 $0B82 $0B82 wc,3 187: 0 $0BC0 $0BC0 wc,3 188: 0 $0BCD $0BCD wc,3 189: 0 $0C3E $0C40 wc,3 190: 0 $0C46 $0C48 wc,3 191: 0 $0C4A $0C4D wc,3 192: 0 $0C55 $0C56 wc,3 193: 0 $0CBC $0CBC wc,3 194: 0 $0CBF $0CBF wc,3 195: 0 $0CC6 $0CC6 wc,3 196: 0 $0CCC $0CCD wc,3 197: 0 $0D41 $0D43 wc,3 198: 0 $0D4D $0D4D wc,3 199: 0 $0DCA $0DCA wc,3 200: 0 $0DD2 $0DD4 wc,3 201: 0 $0DD6 $0DD6 wc,3 202: 0 $0E31 $0E31 wc,3 203: 0 $0E34 $0E3A wc,3 204: 0 $0E47 $0E4E wc,3 205: 0 $0EB1 $0EB1 wc,3 206: 0 $0EB4 $0EB9 wc,3 207: 0 $0EBB $0EBC wc,3 208: 0 $0EC8 $0ECD wc,3 209: 0 $0F18 $0F19 wc,3 210: 0 $0F35 $0F35 wc,3 211: 0 $0F37 $0F37 wc,3 212: 0 $0F39 $0F39 wc,3 213: 0 $0F71 $0F7E wc,3 214: 0 $0F80 $0F84 wc,3 215: 0 $0F86 $0F87 wc,3 216: 0 $0F90 $0F97 wc,3 217: 0 $0F99 $0FBC wc,3 218: 0 $0FC6 $0FC6 wc,3 219: 0 $102D $1030 wc,3 220: 0 $1032 $1032 wc,3 221: 0 $1036 $1037 wc,3 222: 0 $1039 $1039 wc,3 223: 0 $1058 $1059 wc,3 224: 1 $0000 $1100 wc,3 225: 2 $1100 $115f wc,3 226: 0 $1160 $11FF wc,3 227: 0 $1712 $1714 wc,3 228: 0 $1732 $1734 wc,3 229: 0 $1752 $1753 wc,3 230: 0 $1772 $1773 wc,3 231: 0 $17B4 $17B5 wc,3 232: 0 $17B7 $17BD wc,3 233: 0 $17C6 $17C6 wc,3 234: 0 $17C9 $17D3 wc,3 235: 0 $17DD $17DD wc,3 236: 0 $180B $180D wc,3 237: 0 $18A9 $18A9 wc,3 238: 0 $1920 $1922 wc,3 239: 0 $1927 $1928 wc,3 240: 0 $1932 $1932 wc,3 241: 0 $1939 $193B wc,3 242: 0 $200B $200F wc,3 243: 0 $202A $202E wc,3 244: 0 $2060 $2063 wc,3 245: 0 $206A $206F wc,3 246: 0 $20D0 $20EA wc,3 247: 2 $2329 $232A wc,3 248: 0 $302A $302F wc,3 249: 2 $2E80 $303E wc,3 250: 0 $3099 $309A wc,3 251: 2 $3040 $A4CF wc,3 252: 2 $AC00 $D7A3 wc,3 253: 2 $F900 $FAFF wc,3 254: 0 $FB1E $FB1E wc,3 255: 0 $FE00 $FE0F wc,3 256: 0 $FE20 $FE23 wc,3 257: 2 $FE30 $FE6F wc,3 258: 0 $FEFF $FEFF wc,3 259: 2 $FF00 $FF60 wc,3 260: 2 $FFE0 $FFE6 wc,3 261: 0 $FFF9 $FFFB wc,3 262: 0 $1D167 $1D169 wc,3 263: 0 $1D173 $1D182 wc,3 264: 0 $1D185 $1D18B wc,3 265: 0 $1D1AA $1D1AD wc,3 266: 2 $20000 $2FFFD wc,3 267: 2 $30000 $3FFFD wc,3 268: 0 $E0001 $E0001 wc,3 269: 0 $E0020 $E007F wc,3 270: 0 $E0100 $E01EF wc,3 271: here wc-table - Constant #wc-table 272: 273: \ inefficient table walk: 274: 275: : wcwidth ( xc -- n ) 276: wc-table #wc-table over + swap ?DO 277: dup I 2@ within IF I 2 cells + @ UNLOOP EXIT THEN 278: 3 cells +LOOP 1 ; 279: [THEN] 280: 281: : u8width ( xcaddr u -- n ) 282: 0 rot rot over + swap ?DO 283: I xc@+ swap >r wcwidth + 284: r> I - +LOOP ; 285: 286: : set-encoding-utf-8 ( -- ) 287: ['] u8emit is xemit 288: ['] u8key is xkey 289: ['] u8>> is xchar+ 290: ['] u8<< is xchar- 291: [ [IFDEF] xstring+ ] 292: ['] u8\string- is xstring- 293: ['] +u8/string is +xstring 294: [ [THEN] ] 295: [ [IFDEF] +x/string ] 296: ['] u8\string- is x\string- 297: ['] +u8/string is +x/string 298: [ [THEN] ] 299: ['] u8@ is xc@ 300: ['] u8!+? is xc!+? 301: ['] u8@+ is xc@+ 302: ['] u8len is xc-size 303: [ [IFDEF] x-width ] 304: ['] u8width is x-width 305: [ [THEN] ] 306: [ [IFDEF] x-size ] 307: ['] u8addrlen is x-size 308: [ [THEN] ] 309: ['] -u8trailing-garbage is -trailing-garbage 310: ; 311: 312: : utf-8-cold ( -- ) 313: s" LC_ALL" getenv 2dup d0= IF 2drop 314: s" LC_CTYPE" getenv 2dup d0= IF 2drop 315: s" LANG" getenv 2dup d0= IF 2drop 316: s" C" THEN THEN THEN 317: s" UTF-8" search nip nip 318: IF set-encoding-utf-8 ELSE set-encoding-fixed-width THEN ; 319: 320: environment-wordlist set-current 321: : xchar-encoding ( -- addr u ) \ xchar-ext 322: \G Returns a printable ASCII string that reperesents the encoding, 323: \G and use the preferred MIME name (if any) or the name in 324: \G @url{http://www.iana.org/assignments/character-sets} like 325: \G ``ISO-LATIN-1'' or ``UTF-8'', with the exception of ``ASCII'', where 326: \G we prefer the alias ``ASCII''. 327: max-single-byte $80 = IF s" UTF-8" ELSE s" ISO-LATIN-1" THEN ; 328: forth definitions 329: 330: :noname ( -- ) 331: defers 'cold 332: utf-8-cold 333: ; is 'cold 334: 335: utf-8-cold