1 ! Copyright (C) 2007, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: alien.c-types accessors math alien.accessors kernel
4 kernel.private locals sequences sequences.private byte-arrays
5 parser prettyprint.custom fry ;
9 { length array-capacity read-only }
10 { underlying byte-array read-only } ;
14 : n>byte -3 shift ; inline
16 : byte/bit ( n alien -- byte bit )
17 over n>byte alien-unsigned-1 swap 7 bitand ; inline
19 : set-bit ( ? byte bit -- byte )
20 2^ rot [ bitor ] [ bitnot bitand ] if ; inline
22 : bits>cells 31 + -5 shift ; inline
24 : bits>bytes 7 + n>byte ; inline
26 : (set-bits) ( bit-array n -- )
27 [ [ length bits>cells ] keep ] dip swap underlying>>
28 '[ [ _ _ ] dip set-alien-unsigned-4 ] each ; inline
32 : <bit-array> ( n -- bit-array )
33 dup bits>bytes <byte-array> bit-array boa ; inline
35 M: bit-array length length>> ;
37 M: bit-array nth-unsafe
38 [ >fixnum ] [ underlying>> ] bi* byte/bit bit? ;
40 M: bit-array set-nth-unsafe
41 [ >fixnum ] [ underlying>> ] bi*
42 [ byte/bit set-bit ] 2keep
43 swap n>byte set-alien-unsigned-1 ;
45 : clear-bits ( bit-array -- ) 0 (set-bits) ;
47 : set-bits ( bit-array -- ) -1 (set-bits) ;
50 [ length>> ] [ underlying>> clone ] bi bit-array boa ;
52 : >bit-array ( seq -- bit-array )
53 T{ bit-array f 0 B{ } } clone-like ; inline
55 M: bit-array like drop dup bit-array? [ >bit-array ] unless ;
57 M: bit-array new-sequence drop <bit-array> ;
60 over bit-array? [ sequence= ] [ 2drop f ] if ;
64 [ bits>bytes ] [ underlying>> ] bi*
69 M: bit-array byte-length length 7 + -3 shift ;
71 : ?{ \ } [ >bit-array ] parse-literal ; parsing
73 :: integer>bit-array ( n -- bit-array )
74 n zero? [ 0 <bit-array> ] [
75 [let | out [ n log2 1+ <bit-array> ] i! [ 0 ] n'! [ n ] |
77 n' out underlying>> i set-alien-unsigned-1
85 : bit-array>integer ( bit-array -- n )
86 0 swap underlying>> dup length [
87 alien-unsigned-1 swap 8 shift bitor
90 INSTANCE: bit-array sequence
92 M: bit-array pprint-delims drop \ ?{ \ } ;
93 M: bit-array >pprint-sequence ;
94 M: bit-array pprint* pprint-object ;