58 lines
1.6 KiB
Factor
58 lines
1.6 KiB
Factor
! Copyright (C) 2008 Daniel Ehrenberg, Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: arrays assocs biassocs kernel io.encodings math.parser
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sequences hashtables io.encodings.ascii generic parser
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classes.tuple words words.symbol io io.files splitting
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namespaces math compiler.units accessors classes.singleton
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classes.mixin io.encodings.iana fry simple-flat-file lexer ;
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IN: io.encodings.8-bit
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<PRIVATE
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: encoding-file ( file-name -- stream )
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"vocab:io/encodings/8-bit/" ".TXT" surround ;
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SYMBOL: 8-bit-encodings
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8-bit-encodings [ H{ } clone ] initialize
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TUPLE: 8-bit { biassoc biassoc read-only } ;
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: 8-bit-encode ( char 8-bit -- byte )
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biassoc>> value-at [ encode-error ] unless* ; inline
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M: 8-bit encode-char
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swap [ 8-bit-encode ] dip stream-write1 ;
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M: 8-bit encode-string
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swap [ '[ _ 8-bit-encode ] B{ } map-as ] dip stream-write ;
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M: 8-bit decode-char
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swap stream-read1 dup
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[ swap biassoc>> at [ replacement-char ] unless* ]
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[ 2drop f ]
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if ;
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MIXIN: 8-bit-encoding
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M: 8-bit-encoding <encoder>
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8-bit-encodings get-global at <encoder> ;
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M: 8-bit-encoding <decoder>
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8-bit-encodings get-global at <decoder> ;
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: create-encoding ( name -- word )
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create-in
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[ define-singleton-class ]
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[ 8-bit-encoding add-mixin-instance ]
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[ ] tri ;
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: load-encoding ( name iana-name file-name -- )
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[ create-encoding dup ]
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[ register-encoding ]
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[ encoding-file flat-file>biassoc 8-bit boa ] tri*
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swap 8-bit-encodings get-global set-at ;
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PRIVATE>
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SYNTAX: 8-BIT: scan-token scan-token scan-token load-encoding ;
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