1 ! Copyright (C) 2003, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors alien.accessors byte-arrays kernel
4 kernel.private math math.private sequences sequences.private
8 BUILTIN: string { length array-capacity read-only initial: 0 } aux ;
12 : string-hashcode ( str -- n ) 3 slot ; inline
14 : set-string-hashcode ( n str -- ) 3 set-slot ; inline
16 : reset-string-hashcode ( str -- )
17 f swap set-string-hashcode ; inline
19 : rehash-string ( str -- )
20 1 over sequence-hashcode swap set-string-hashcode ; inline
22 : (aux) ( n string -- byte-array m )
23 aux>> { byte-array } declare swap 1 fixnum-shift-fast ; inline
25 : small-char? ( ch -- ? )
26 dup 0 fixnum>= [ 0x7f fixnum<= ] [ drop f ] if ; inline
28 : string-nth ( n string -- ch )
29 2dup string-nth-fast dup small-char?
31 [ (aux) alien-unsigned-2 7 fixnum-shift-fast ] dip
35 : ensure-aux ( string -- string )
36 dup aux>> [ dup length 2 * (byte-array) >>aux ] unless ; inline
38 : set-string-nth-slow ( ch n string -- )
39 [ [ 0x80 fixnum-bitor ] 2dip set-string-nth-fast ]
42 [ -7 fixnum-shift-fast 1 fixnum-bitxor ] 2dip
43 (aux) set-alien-unsigned-2
46 : set-string-nth ( ch n string -- )
48 [ set-string-nth-fast ] [ set-string-nth-slow ] if ; inline
54 2dup [ hashcode ] bi@ eq?
55 [ sequence= ] [ 2drop f ] if
63 [ ] [ dup rehash-string string-hashcode ] ?if ;
69 [ integer>fixnum ] dip string-nth ; inline
71 M: string set-nth-unsafe
72 dup reset-string-hashcode
73 [ integer>fixnum ] [ integer>fixnum ] [ ] tri* set-string-nth ; inline
76 (clone) [ clone ] change-aux ; inline
79 over string? [ drop clone ] [ call-next-method ] if ; inline
81 M: string resize resize-string ; inline
83 : 1string ( ch -- str ) 1 swap <string> ; inline
85 : >string ( seq -- str ) "" clone-like ; inline
87 M: string new-sequence drop 0 <string> ; inline
89 INSTANCE: string sequence