51 lines
1.8 KiB
Factor
51 lines
1.8 KiB
Factor
! (c)2010 Joe Groff bsd license
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USING: accessors byte-arrays byte-arrays.hex combinators
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continuations fry io io.encodings io.encodings.8-bit.latin1
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io.encodings.ascii io.encodings.binary io.encodings.iana
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io.encodings.string io.encodings.utf16 io.encodings.utf32
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io.encodings.utf8 io.files io.streams.string kernel literals
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math namespaces sequences strings ;
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IN: io.encodings.detect
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SYMBOL: default-8bit-encoding
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default-8bit-encoding [ latin1 ] initialize
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<PRIVATE
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: prolog-tag ( bytes -- string )
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CHAR: > over index [ 1 + ] [ dup length ] if* head-slice >string ;
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: prolog-encoding ( string -- iana-encoding )
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'[
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_ "encoding=" over start
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10 + swap [ [ 1 - ] dip nth ] [ index-from ] [ swapd subseq ] 2tri
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] [ drop "UTF-8" ] recover ;
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: detect-xml-prolog ( bytes -- encoding )
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prolog-tag prolog-encoding name>encoding [ ascii ] unless* ;
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: valid-utf8? ( bytes -- ? )
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utf8 decode 1 head-slice* replacement-char swap member? not ;
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PRIVATE>
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: detect-byte-array ( bytes -- encoding )
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{
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{ [ dup HEX{ 0000FEFF } head? ] [ drop utf32be ] }
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{ [ dup HEX{ FFFE0000 } head? ] [ drop utf32le ] }
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{ [ dup HEX{ FEFF } head? ] [ drop utf16be ] }
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{ [ dup HEX{ FFFE } head? ] [ drop utf16le ] }
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{ [ dup HEX{ EF BB BF } head? ] [ drop utf8 ] }
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{ [ dup $[ "<?xml" >byte-array ] head? ] [ detect-xml-prolog ] }
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{ [ 0 over member? ] [ drop binary ] }
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{ [ dup empty? ] [ drop utf8 ] }
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{ [ dup valid-utf8? ] [ drop utf8 ] }
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[ drop default-8bit-encoding get ]
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} cond ;
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: detect-stream ( stream -- sample encoding )
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256 swap stream-read dup detect-byte-array ;
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: detect-file ( file -- encoding )
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binary [ input-stream get detect-stream nip ] with-file-reader ;
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