Annotation of gforth/utf-8.fs, revision 1.21
1.1 pazsan 1: \ UTF-8 handling 12dec04py
2:
1.18 anton 3: \ Copyright (C) 2004,2005 Free Software Foundation, Inc.
1.1 pazsan 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:
1.7 pazsan 23: s" malformed UTF-8 character" exception Constant UTF-8-err
24:
1.13 anton 25: $80 Value max-single-byte
1.10 pazsan 26:
1.4 pazsan 27: : u8len ( u8 -- n )
1.13 anton 28: dup max-single-byte u< IF drop 1 EXIT THEN \ special case ASCII
1.1 pazsan 29: $800 2 >r
1.17 pazsan 30: BEGIN 2dup u>= WHILE 5 lshift r> 1+ >r dup 0= UNTIL THEN
1.1 pazsan 31: 2drop r> ;
32:
33: : u8@+ ( u8addr -- u8addr' u )
1.13 anton 34: count dup max-single-byte u< ?EXIT \ special case ASCII
1.17 pazsan 35: dup $C2 u< IF UTF-8-err throw THEN \ malformed character
1.1 pazsan 36: $7F and $40 >r
37: BEGIN dup r@ and WHILE r@ xor
38: 6 lshift r> 5 lshift >r >r count
1.7 pazsan 39: dup $C0 and $80 <> IF UTF-8-err throw THEN
1.1 pazsan 40: $3F and r> or
41: REPEAT rdrop ;
42:
43: : u8!+ ( u u8addr -- u8addr' )
1.13 anton 44: over max-single-byte u< IF tuck c! 1+ EXIT THEN \ special case ASCII
1.1 pazsan 45: >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:
1.8 pazsan 51: \ plug-in so that char and '<char> work for UTF-8
52:
1.9 anton 53: [ifundef] char@ \ !! bootstrapping help
54: Defer char@ ( addr u -- char addr' u' )
55: :noname over c@ -rot 1 /string ; IS char@
56: [then]
57:
1.8 pazsan 58: :noname ( addr u -- char addr' u' )
1.9 anton 59: \ !! 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
1.8 pazsan 62: over + >r u8@+ swap r> over - ; IS char@
63:
1.1 pazsan 64: \ scan to next/previous character
65:
1.13 anton 66: \ alternative names: u8char+ u8char-
67:
1.12 pazsan 68: : u8>> ( u8addr -- u8addr' ) u8@+ drop ;
1.1 pazsan 69: : u8<< ( u8addr -- u8addr' )
1.13 anton 70: BEGIN 1- dup c@ $C0 and max-single-byte <> UNTIL ;
1.1 pazsan 71:
72: \ utf key and emit
73:
74: : u8key ( -- u )
1.13 anton 75: defers key dup max-single-byte u< ?EXIT \ special case ASCII
1.17 pazsan 76: dup $C2 u< IF UTF-8-err throw THEN \ malformed character
1.1 pazsan 77: $7F and $40 >r
78: BEGIN dup r@ and WHILE r@ xor
79: 6 lshift r> 5 lshift >r >r defers key
1.7 pazsan 80: dup $C0 and $80 <> IF UTF-8-err throw THEN
1.1 pazsan 81: $3F and r> or
82: REPEAT rdrop ;
83:
84: : u8emit ( u -- )
1.13 anton 85: dup max-single-byte u< IF defers emit EXIT THEN \ special case ASCII
1.1 pazsan 86: 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 ;
1.13 anton 91:
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:
1.21 ! pazsan 131: [IFDEF] wcwidth
1.19 pazsan 132: : u8width ( xcaddr u -- n )
133: 0 rot rot over + swap ?DO
134: I xc@+ swap >r wcwidth +
135: r> I - +LOOP ;
1.21 ! pazsan 136: [THEN]
1.19 pazsan 137:
1.13 anton 138: : set-encoding-utf-8 ( -- )
139: ['] u8emit is xemit
140: ['] u8key is xkey
141: ['] u8>> is xchar+
142: ['] u8<< is xchar-
143: ['] +u8/string is +x/string
144: ['] -u8/string is -x/string
145: ['] u8@ is xc@
146: ['] u8!+? is xc!+?
147: ['] u8@+ is xc@+
148: ['] u8len is xc-size
1.20 pazsan 149: [ [IFDEF] x-width ]
1.19 pazsan 150: ['] u8width is x-width
1.20 pazsan 151: [ [THEN] ]
1.13 anton 152: ['] -u8trailing-garbage is -trailing-garbage
153: ;
1.1 pazsan 154:
1.15 anton 155: : utf-8-cold ( -- )
1.16 pazsan 156: s" LC_ALL" getenv 2dup d0= IF 2drop
157: s" LC_CTYPE" getenv 2dup d0= IF 2drop
158: s" LANG" getenv 2dup d0= IF 2drop
159: s" C" THEN THEN THEN
160: s" UTF-8" search nip nip
1.15 anton 161: IF set-encoding-utf-8 ELSE set-encoding-fixed-width THEN ;
162:
163: ' utf-8-cold INIT8 chained
164:
165: utf-8-cold
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