52 lines
1.1 KiB
Factor
52 lines
1.1 KiB
Factor
! Copyright (C) 2007 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: math alien kernel kernel.private sequences
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sequences.private ;
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IN: bit-arrays
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<PRIVATE
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: n>cell -5 shift 4 * ; inline
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: cell/bit ( n alien -- byte bit )
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over n>cell alien-unsigned-4 swap 31 bitand ; inline
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: set-bit ( ? byte bit -- byte )
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2^ rot [ bitor ] [ bitnot bitand ] if ; inline
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: bits>bytes 7 + -3 shift ; inline
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: bits>cells 31 + -5 shift ; inline
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: (set-bits) ( bit-array n -- )
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over length bits>cells -rot [
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swap rot 4 * set-alien-unsigned-4
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] 2curry each ; inline
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PRIVATE>
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M: bit-array length array-capacity ;
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M: bit-array nth-unsafe cell/bit bit? ;
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M: bit-array set-nth-unsafe
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[ cell/bit set-bit ] 2keep
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swap n>cell set-alien-unsigned-4 ;
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: clear-bits ( bit-array -- ) 0 (set-bits) ;
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: set-bits ( bit-array -- ) -1 (set-bits) ;
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M: bit-array clone (clone) ;
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: >bit-array ( seq -- bit-array ) ?{ } clone-like ; inline
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M: bit-array like drop dup bit-array? [ >bit-array ] unless ;
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M: bit-array new drop <bit-array> ;
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M: bit-array equal?
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over bit-array? [ sequence= ] [ 2drop f ] if ;
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INSTANCE: bit-array sequence
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