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.backend ;
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
28 [ -rot underlying>> set-uint-nth ] 2curry
33 : <bit-array> ( n -- bit-array )
34 dup bits>bytes <byte-array> bit-array boa ; inline
36 M: bit-array length length>> ;
38 M: bit-array nth-unsafe
39 [ >fixnum ] [ underlying>> ] bi* byte/bit bit? ;
41 M: bit-array set-nth-unsafe
42 [ >fixnum ] [ underlying>> ] bi*
43 [ byte/bit set-bit ] 2keep
44 swap n>byte set-alien-unsigned-1 ;
46 : clear-bits ( bit-array -- ) 0 (set-bits) ;
48 : set-bits ( bit-array -- ) -1 (set-bits) ;
51 [ length>> ] [ underlying>> clone ] bi bit-array boa ;
53 : >bit-array ( seq -- bit-array )
54 T{ bit-array f 0 B{ } } clone-like ; inline
56 M: bit-array like drop dup bit-array? [ >bit-array ] unless ;
58 M: bit-array new-sequence drop <bit-array> ;
61 over bit-array? [ sequence= ] [ 2drop f ] if ;
65 [ bits>bytes ] [ underlying>> ] bi*
70 M: bit-array byte-length length 7 + -3 shift ;
72 : ?{ \ } [ >bit-array ] parse-literal ; parsing
74 :: integer>bit-array ( n -- bit-array )
75 n zero? [ 0 <bit-array> ] [
76 [let | out [ n log2 1+ <bit-array> ] i! [ 0 ] n'! [ n ] |
78 n' out underlying>> i set-alien-unsigned-1
86 : bit-array>integer ( bit-array -- n )
87 0 swap underlying>> [ length ] keep [
88 uchar-nth swap 8 shift bitor
91 INSTANCE: bit-array sequence
93 M: bit-array pprint-delims drop \ ?{ \ } ;
94 M: bit-array >pprint-sequence ;
95 M: bit-array pprint* pprint-object ;