1 ! Copyright (C) 2005, 2006 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 IN: hashtables-internals
4 USING: arrays hashtables kernel kernel-internals math
5 math-internals sequences sequences-internals vectors ;
9 : ((empty)) T{ tombstone f } ; inline
10 : ((tombstone)) T{ tombstone t } ; inline
12 : hash@ ( key array -- i )
13 >r hashcode r> array-capacity 2 /i rem 2 * >fixnum ; inline
15 : probe ( array i -- array i )
16 2 fixnum+fast over array-capacity fixnum-mod ; inline
18 : (key@) ( key keys i -- n )
19 #! cond form expanded by hand for better interpreter speed
20 3dup swap array-nth dup ((tombstone)) eq? [
26 = [ 2nip ] [ probe (key@) ] if
30 : key@ ( key hash -- i )
31 hash-array 2dup hash@ (key@) ; inline
33 : if-key ( key hash true false -- )
34 >r >r [ key@ ] 2keep pick -1 > r> r> if ; inline
36 : <hash-array> ( n -- array )
37 >fixnum 1+ 4 * ((empty)) <array> ; inline
39 : init-hash ( hash -- )
40 0 over set-hash-count 0 swap set-hash-deleted ;
42 : reset-hash ( n hash -- )
43 swap <hash-array> over set-hash-array init-hash ;
45 : (new-key@) ( key keys i -- n )
46 #! cond form expanded by hand for better interpreter speed
47 3dup swap array-nth dup ((empty)) eq? [
57 : new-key@ ( key hash -- i )
58 hash-array 2dup hash@ (new-key@) ; inline
60 : nth-pair ( n seq -- key value )
61 [ array-nth ] 2keep >r 1+ r> array-nth ; inline
63 : set-nth-pair ( value key n seq -- )
64 [ set-array-nth ] 2keep >r 1+ r> set-array-nth ; inline
66 : hash-count+ ( hash -- )
67 dup hash-count 1+ swap set-hash-count ; inline
69 : hash-deleted+ ( hash -- )
70 dup hash-deleted 1+ swap set-hash-deleted ; inline
72 : change-size ( hash old -- )
73 ((empty)) eq? [ hash-count+ ] [ drop ] if ; inline
75 : (set-hash) ( value key hash -- )
77 [ hash-array 2dup array-nth ] keep
78 swap change-size set-nth-pair ; inline
80 : (each-pair) ( quot array i -- )
81 over array-capacity over eq? [
85 swap nth-pair over tombstone?
86 [ 3drop ] [ rot call ] if
87 ] 3keep 2 fixnum+fast (each-pair)
90 : each-pair ( array quot -- )
91 swap 0 (each-pair) ; inline
93 : (all-pairs?) ( quot array i -- ? )
94 over array-capacity over eq? [
97 3dup >r >r >r swap nth-pair over tombstone? [
98 3drop r> r> r> 2 fixnum+fast (all-pairs?)
101 r> r> r> 2 fixnum+fast (all-pairs?)
108 : all-pairs? ( array quot -- ? )
109 swap 0 (all-pairs?) ; inline
111 : (hash-keys/values) ( hash quot -- accum array )
113 hash-array [ length 2 /i <vector> ] keep
114 r> each-pair { } like ; inline
118 : <hashtable> ( n -- hash )
119 (hashtable) [ reset-hash ] keep ;
121 : hash* ( key hash -- value ? )
123 nip >r 1 fixnum+fast r> hash-array array-nth t
128 : hash-member? ( key hash -- ? )
129 [ 3drop t ] [ 3drop f ] if-key ;
131 : ?hash* ( key hash/f -- value/f ? )
132 dup [ hash* ] [ 2drop f f ] if ;
134 : hash ( key hash -- value ) hash* drop ; inline
136 : ?hash ( key hash/f -- value )
137 dup [ hash ] [ 2drop f ] if ;
139 : clear-hash ( hash -- )
140 dup init-hash hash-array [ drop ((empty)) ] inject ;
142 : remove-hash ( key hash -- )
146 hash-array >r >r ((tombstone)) dup r> r> set-nth-pair
151 : remove-hash* ( key hash -- old )
152 [ hash ] 2keep remove-hash ;
154 : ?remove-hash ( key hash -- )
155 [ remove-hash ] [ drop ] if* ;
157 : hash-size ( hash -- n )
158 dup hash-count swap hash-deleted - ; inline
160 : hash-empty? ( hash -- ? ) hash-size zero? ;
162 : grow-hash ( hash -- )
163 [ dup hash-array swap hash-size 1+ ] keep
164 [ reset-hash ] keep swap [ swap pick (set-hash) ] each-pair
167 : ?grow-hash ( hash -- )
168 dup hash-count 1 fixnum+fast 3 fixnum*
169 over hash-array array-capacity >
170 [ grow-hash ] [ drop ] if ; inline
172 : set-hash ( value key hash -- )
173 dup ?grow-hash (set-hash) ;
175 : hash+ ( n key hash -- )
176 [ hash [ 0 ] unless* + ] 2keep set-hash ;
178 : associate ( value key -- hash )
179 2 <hashtable> [ set-hash ] keep ;
181 : hash-keys ( hash -- seq )
182 [ drop over push ] (hash-keys/values) ;
184 : hash-values ( hash -- seq )
185 [ nip over push ] (hash-keys/values) ;
187 : hash>alist ( hash -- alist )
188 dup hash-keys swap hash-values 2array flip ;
190 : alist>hash ( alist -- hash )
191 [ length <hashtable> ] keep
192 [ first2 swap pick (set-hash) ] each ;
194 : hash-each ( hash quot -- )
195 >r hash-array r> each-pair ; inline
197 : hash-each-with ( obj hash quot -- )
198 swap [ 2swap [ >r -rot r> call ] 2keep ] hash-each 2drop ;
201 : hash-all? ( hash quot -- ? )
202 >r hash-array r> all-pairs? ; inline
204 : hash-all-with? ( obj hash quot -- )
206 [ 2swap [ >r -rot r> call ] 2keep rot ] hash-all? 2nip ;
209 : subhash? ( hash1 hash2 -- ? )
211 >r swap hash* [ r> = ] [ r> 2drop f ] if
214 : hash-subset ( hash quot -- subhash )
215 over hash-size <hashtable> rot [
217 >r pick pick >r >r call [
218 r> r> swap r> set-hash
223 ] hash-each nip ; inline
225 : hash-subset-with ( obj hash quot -- subhash )
227 [ 2swap [ >r -rot r> call ] 2keep rot ] hash-subset 2nip ;
231 (clone) dup hash-array clone over set-hash-array ;
233 : hashtable= ( hash hash -- ? )
234 2dup subhash? >r swap subhash? r> and ;
238 { [ over hashtable? not ] [ 2drop f ] }
239 { [ 2dup [ hash-size ] 2apply number= not ] [ 2drop f ] }
240 { [ t ] [ hashtable= ] }
243 : hashtable-hashcode ( hashtable -- n )
245 hashcode >r hashcode -1 shift r> bitxor bitxor
248 M: hashtable hashcode
249 dup hash-size 1 number=
250 [ hashtable-hashcode ] [ hash-size ] if ;
252 : ?hash ( key hash/f -- value/f )
253 dup [ hash ] [ 2drop f ] if ;
255 : ?hash* ( key hash/f -- value/f ? )
256 dup [ hash* ] [ 2drop f f ] if ;
258 IN: hashtables-internals
260 : (hash-stack) ( key i seq -- value )
264 3dup nth-unsafe dup [
268 drop >r 1- r> (hash-stack)
271 2drop >r 1- r> (hash-stack)
277 : hash-stack ( key seq -- value )
278 dup length 1- swap (hash-stack) ;
280 : hash-intersect ( hash1 hash2 -- intersection )
281 [ drop swap hash ] hash-subset-with ;
283 : hash-diff ( hash1 hash2 -- difference )
284 [ drop swap hash not ] hash-subset-with ;
286 : hash-update ( hash1 hash2 -- )
287 [ swap rot set-hash ] hash-each-with ;
289 : hash-union ( hash1 hash2 -- union )
290 >r clone dup r> hash-update ;
292 : remove-all ( hash seq -- subseq )
293 [ swap hash-member? not ] subset-with ;
295 : cache ( key hash quot -- value )
299 pick rot >r >r call dup r> r> set-hash
302 : map>hash ( seq quot -- hash )
303 over length <hashtable> rot
304 [ -rot [ >r call swap r> set-hash ] 2keep ] each nip ;