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Incomplete update of UTF decoder

db4
Daniel Ehrenberg 2008-02-01 17:45:35 -06:00
parent 7cd7af7bd1
commit c66b264af5
2 changed files with 14 additions and 11 deletions
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7
core/io/encodings/encodings.factor
View File

@ -1,7 +1,7 @@
! Copyright (C) 2006, 2007 Daniel Ehrenberg.
! See http://factorcode.org/license.txt for BSD license.
USING: math kernel sequences sbufs vectors
namespaces ;
namespaces unicode.syntax ;
IN: io.encodings
TUPLE: encode-error ;
@ -10,13 +10,16 @@ TUPLE: encode-error ;
TUPLE: decode-error ;
: decode-error ( -- * ) \ decode-error construct-empty throw ;
: decode-error ( -- * ) \ encode-error construct-empty throw ;
SYMBOL: begin
: decoded ( buf ch -- buf ch state )
over push 0 begin ;
: push-replacement ( buf -- buf ch state )
UNICHAR: replacement-character decoded ;
: finish-decoding ( buf ch state -- str )
begin eq? [ decode-error ] unless drop "" like ;

18
core/io/utf8/utf8.factor
View File

@ -14,10 +14,10 @@ SYMBOL: quad3
: starts-2? ( char -- ? )
-6 shift BIN: 10 number= ;
: append-nums ( bottom top -- num )
over starts-2?
[ 6 shift swap BIN: 111111 bitand bitor ]
[ decode-error ] if ;
: append-nums ( buf bottom top state-out -- buf num state )
>r over starts-2?
[ 6 shift swap BIN: 111111 bitand bitor r> ]
[ r> 3drop push-replacement ] if ;
: begin-utf8 ( buf byte -- buf ch state )
{
@ -25,20 +25,20 @@ SYMBOL: quad3
{ [ dup -5 shift BIN: 110 number= ] [ BIN: 11111 bitand double ] }
{ [ dup -4 shift BIN: 1110 number= ] [ BIN: 1111 bitand triple ] }
{ [ dup -3 shift BIN: 11110 number= ] [ BIN: 111 bitand quad ] }
{ [ t ] [ decode-error ] }
{ [ t ] [ drop push-replacement ] }
} cond ;
: end-multibyte ( buf byte ch -- buf ch state )
append-nums decoded ;
begin append-nums decoded ;
: (decode-utf8) ( buf byte ch state -- buf ch state )
{
{ begin [ drop begin-utf8 ] }
{ double [ end-multibyte ] }
{ triple [ append-nums triple2 ] }
{ triple [ triple2 append-nums ] }
{ triple2 [ end-multibyte ] }
{ quad [ append-nums quad2 ] }
{ quad2 [ append-nums quad3 ] }
{ quad [ quad2 append-nums ] }
{ quad2 [ quad3 append-nums ] }
{ quad3 [ end-multibyte ] }
} case ;