Improve encoding API

core/io/encodings/encodings.factor

@@ -14,7 +14,7 @@ GENERIC: encode-char ( char stream encoding -- )
 
 GENERIC: <decoder> ( stream encoding -- newstream )
 
-: replacement-char HEX: fffd ;
+: replacement-char HEX: fffd ; inline
 
 TUPLE: decoder stream code cr ;
 
@@ -121,14 +121,28 @@ M: encoder stream-flush encoder-stream stream-flush ;
 INSTANCE: encoder plain-writer
 PRIVATE>
 
-: re-encode ( stream encoding -- newstream )
-    over encoder? [ >r encoder-stream r> ] when <encoder> ;
+GENERIC# re-encode 1 ( stream encoding -- newstream )
+
+M: object re-encode <encoder> ;
+
+M: encoder re-encode [ stream>> ] dip re-encode ;
 
 : encode-output ( encoding -- )
     output-stream [ swap re-encode ] change ;
 
-: re-decode ( stream encoding -- newstream )
-    over decoder? [ >r decoder-stream r> ] when <decoder> ;
+: with-encoded-output ( encoding quot -- )
+    [ [ output-stream get ] dip re-encode ] dip
+    with-output-stream* ; inline
+
+GENERIC# re-decode 1 ( stream encoding -- newstream )
+
+M: object re-decode <decoder> ;
+
+M: decoder re-decode [ stream>> ] dip re-decode ;
 
 : decode-input ( encoding -- )
     input-stream [ swap re-decode ] change ;
+
+: with-decoded-input ( encoding quot -- )
+    [ [ input-stream get ] dip re-decode ] dip
+    with-input-stream* ; inline

extra/io/encodings/8-bit/8-bit-tests.factor

@@ -1,4 +1,5 @@
-USING: io.encodings.string io.encodings.8-bit tools.test strings arrays ;
+USING: io.encodings.string io.encodings.8-bit
+io.encodings.8-bit.private tools.test strings arrays ;
 IN: io.encodings.8-bit.tests
 
 [ B{ CHAR: f CHAR: o CHAR: o } ] [ "foo" latin1 encode ] unit-test
@@ -8,3 +9,6 @@ IN: io.encodings.8-bit.tests
 [ "bar" ] [ "bar" latin1 decode ] unit-test
 [ { CHAR: b 233 CHAR: r } ] [ { CHAR: b 233 CHAR: r } latin1 decode >array ] unit-test
 [ { HEX: fffd HEX: 20AC } ] [ { HEX: 81 HEX: 80 } windows-1252 decode >array ] unit-test
+
+[ t ] [ \ latin1 8-bit-encoding? ] unit-test
+[ "bar" ] [ "bar" \ latin1 decode ] unit-test

extra/io/encodings/8-bit/8-bit.factor

@@ -73,6 +73,13 @@ M: 8-bit decode-char
 : define-8-bit-encoding ( name stream -- )
     >r in get create r> parse-file make-8-bit ;
 
+PREDICATE: 8-bit-encoding < word
+    word-def dup length 1 = [ first 8-bit? ] [ drop f ] if ;
+
+M: 8-bit-encoding <encoder> word-def first <encoder> ;
+
+M: 8-bit-encoding <decoder> word-def first <decoder> ;
+
 PRIVATE>
 
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