96 lines
2.4 KiB
Factor
Executable File
96 lines
2.4 KiB
Factor
Executable File
! Copyright (C) 2007, 2008 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: alien.c-types accessors math alien.accessors kernel
|
|
kernel.private locals sequences sequences.private byte-arrays
|
|
parser prettyprint.backend ;
|
|
IN: bit-arrays
|
|
|
|
TUPLE: bit-array
|
|
{ length array-capacity read-only }
|
|
{ underlying byte-array read-only } ;
|
|
|
|
<PRIVATE
|
|
|
|
: n>byte -3 shift ; inline
|
|
|
|
: byte/bit ( n alien -- byte bit )
|
|
over n>byte alien-unsigned-1 swap 7 bitand ; inline
|
|
|
|
: set-bit ( ? byte bit -- byte )
|
|
2^ rot [ bitor ] [ bitnot bitand ] if ; inline
|
|
|
|
: bits>cells 31 + -5 shift ; inline
|
|
|
|
: bits>bytes 7 + n>byte ; inline
|
|
|
|
: (set-bits) ( bit-array n -- )
|
|
[ [ length bits>cells ] keep ] dip
|
|
[ -rot underlying>> set-uint-nth ] 2curry
|
|
each ; inline
|
|
|
|
PRIVATE>
|
|
|
|
: <bit-array> ( n -- bit-array )
|
|
dup bits>bytes <byte-array> bit-array boa ; inline
|
|
|
|
M: bit-array length length>> ;
|
|
|
|
M: bit-array nth-unsafe
|
|
[ >fixnum ] [ underlying>> ] bi* byte/bit bit? ;
|
|
|
|
M: bit-array set-nth-unsafe
|
|
[ >fixnum ] [ underlying>> ] bi*
|
|
[ byte/bit set-bit ] 2keep
|
|
swap n>byte set-alien-unsigned-1 ;
|
|
|
|
: clear-bits ( bit-array -- ) 0 (set-bits) ;
|
|
|
|
: set-bits ( bit-array -- ) -1 (set-bits) ;
|
|
|
|
M: bit-array clone
|
|
[ length>> ] [ underlying>> clone ] bi bit-array boa ;
|
|
|
|
: >bit-array ( seq -- bit-array )
|
|
T{ bit-array f 0 B{ } } clone-like ; inline
|
|
|
|
M: bit-array like drop dup bit-array? [ >bit-array ] unless ;
|
|
|
|
M: bit-array new-sequence drop <bit-array> ;
|
|
|
|
M: bit-array equal?
|
|
over bit-array? [ sequence= ] [ 2drop f ] if ;
|
|
|
|
M: bit-array resize
|
|
[ drop ] [
|
|
[ bits>bytes ] [ underlying>> ] bi*
|
|
resize-byte-array
|
|
] 2bi
|
|
bit-array boa ;
|
|
|
|
M: bit-array byte-length length 7 + -3 shift ;
|
|
|
|
: ?{ \ } [ >bit-array ] parse-literal ; parsing
|
|
|
|
:: integer>bit-array ( n -- bit-array )
|
|
n zero? [ 0 <bit-array> ] [
|
|
[let | out [ n log2 1+ <bit-array> ] i! [ 0 ] n'! [ n ] |
|
|
[ n' zero? not ] [
|
|
n' out underlying>> i set-alien-unsigned-1
|
|
n' -8 shift n'!
|
|
i 1+ i!
|
|
] [ ] while
|
|
out
|
|
]
|
|
] if ;
|
|
|
|
: bit-array>integer ( bit-array -- n )
|
|
0 swap underlying>> [ length ] keep [
|
|
uchar-nth swap 8 shift bitor
|
|
] curry each ;
|
|
|
|
INSTANCE: bit-array sequence
|
|
|
|
M: bit-array pprint-delims drop \ ?{ \ } ;
|
|
M: bit-array >pprint-sequence ;
|
|
M: bit-array pprint* pprint-object ;
|