1 ! Copyright (C) 2008, 2010 Daniel Ehrenberg, Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: math kernel sequences sbufs vectors namespaces growable
4 strings io classes continuations destructors combinators
5 io.streams.plain splitting byte-arrays
6 sequences.private accessors ;
9 ! The encoding descriptor protocol
11 GENERIC: decode-char ( stream encoding -- char/f )
13 GENERIC: encode-char ( char stream encoding -- )
15 GENERIC: encode-string ( string stream encoding -- )
17 M: object encode-string [ encode-char ] 2curry each ; inline
19 GENERIC: <decoder> ( stream encoding -- newstream )
21 CONSTANT: replacement-char HEX: fffd
23 TUPLE: decoder stream code cr ;
27 GENERIC: <encoder> ( stream encoding -- newstream )
29 TUPLE: encoder stream code ;
35 M: object <decoder> f decoder boa ;
39 : cr+ ( stream -- ) t >>cr drop ; inline
41 : cr- ( stream -- ) f >>cr drop ; inline
43 : >decoder< ( decoder -- stream encoding )
44 [ stream>> ] [ code>> ] bi ; inline
46 : fix-read1 ( stream char -- char )
54 M: decoder stream-element-type
57 M: decoder stream-tell stream>> stream-tell ;
59 M: decoder stream-seek stream>> stream-seek ;
61 M: decoder stream-read1
62 dup >decoder< decode-char fix-read1 ;
64 : fix-read ( stream string -- string )
68 over stream-read1 [ suffix ] when*
72 : (read) ( n quot -- n string )
75 over [ swapd set-nth-unsafe f ] [ 3drop t ] if
76 ] curry compose find-integer
79 : finish-read ( n string -- string/f )
81 { [ over 0 = ] [ 2drop f ] }
82 { [ over not ] [ nip ] }
86 M: decoder stream-read
87 [ nip ] [ >decoder< [ decode-char ] 2curry (read) finish-read ] 2bi
90 M: decoder stream-read-partial stream-read ;
92 : line-ends/eof ( stream str -- str ) f like swap cr- ; inline
94 : line-ends\r ( stream str -- str ) swap cr+ ; inline
96 : line-ends\n ( stream str -- str )
97 over cr>> over empty? and
98 [ drop dup cr- stream-readln ] [ swap cr- ] if ; inline
100 : handle-readln ( stream str ch -- str )
102 { f [ line-ends/eof ] }
103 { CHAR: \r [ line-ends\r ] }
104 { CHAR: \n [ line-ends\n ] }
107 : ((read-until)) ( buf quot: ( -- char stop? ) -- string/f sep/f )
109 [ [ drop "" like ] dip ]
110 [ pick push ((read-until)) ] if ; inline recursive
112 : (read-until) ( quot -- string/f sep/f )
113 100 <sbuf> swap ((read-until)) ; inline
115 : decoder-read-until ( seps stream encoding -- string/f sep/f )
116 [ decode-char dup [ dup rot member? ] [ 2drop f t ] if ] 3curry
119 M: decoder stream-read-until >decoder< decoder-read-until ;
121 : decoder-readln ( stream encoding -- string/f sep/f )
122 [ decode-char dup [ dup "\r\n" member? ] [ drop f t ] if ] 2curry
125 M: decoder stream-readln dup >decoder< decoder-readln handle-readln ;
127 M: decoder dispose stream>> dispose ;
130 M: object <encoder> encoder boa ;
132 : >encoder< ( encoder -- stream encoding )
133 [ stream>> ] [ code>> ] bi ; inline
135 M: encoder stream-element-type
138 M: encoder stream-write1
139 >encoder< encode-char ;
141 M: encoder stream-write
142 >encoder< encode-string ;
144 M: encoder dispose stream>> dispose ;
146 M: encoder stream-flush stream>> stream-flush ;
148 INSTANCE: encoder plain-writer
151 GENERIC# re-encode 1 ( stream encoding -- newstream )
153 M: object re-encode <encoder> ;
155 M: encoder re-encode [ stream>> ] dip re-encode ;
157 : encode-output ( encoding -- )
158 output-stream [ swap re-encode ] change ;
160 : with-encoded-output ( encoding quot -- )
161 [ [ output-stream get ] dip re-encode ] dip
162 with-output-stream* ; inline
164 GENERIC# re-decode 1 ( stream encoding -- newstream )
166 M: object re-decode <decoder> ;
168 M: decoder re-decode [ stream>> ] dip re-decode ;
170 : decode-input ( encoding -- )
171 input-stream [ swap re-decode ] change ;
173 : with-decoded-input ( encoding quot -- )
174 [ [ input-stream get ] dip re-decode ] dip
175 with-input-stream* ; inline