1 ! Copyright (C) 2008 Daniel Ehrenberg.
\r
2 ! See http://factorcode.org/license.txt for BSD license.
\r
3 USING: accessors arrays assocs binary-search grouping kernel
\r
4 locals make math math.order sequences sequences.private sorting ;
\r
7 TUPLE: interval-map { array array read-only } ;
\r
11 ALIAS: start first-unsafe
\r
12 ALIAS: end second-unsafe
\r
13 ALIAS: value third-unsafe
\r
15 : find-interval ( key interval-map -- interval-node )
\r
16 array>> [ start <=> ] with search nip ; inline
\r
18 : interval-contains? ( key interval-node -- ? )
\r
19 first2-unsafe between? ; inline
\r
21 : all-intervals ( sequence -- intervals )
\r
22 [ [ dup number? [ dup 2array ] when ] dip ] { } assoc-map-as ;
\r
24 : disjoint? ( node1 node2 -- ? )
\r
25 [ end ] [ start ] bi* < ;
\r
27 : ensure-disjoint ( intervals -- intervals )
\r
28 dup [ disjoint? ] monotonic?
\r
29 [ "Intervals are not disjoint" throw ] unless ;
\r
31 : >intervals ( specification -- intervals )
\r
32 [ suffix ] { } assoc>map concat 3 group ;
\r
34 ERROR: not-an-interval-map obj ;
\r
36 : check-interval-map ( map -- map )
\r
37 dup interval-map? [ not-an-interval-map ] unless ; inline
\r
41 : interval-at* ( key map -- value ? )
\r
43 [ drop ] [ find-interval ] 2bi
\r
44 [ nip ] [ interval-contains? ] 2bi
\r
45 [ value t ] [ drop f f ] if ; inline
\r
47 : interval-at ( key map -- value ) interval-at* drop ; inline
\r
49 : interval-key? ( key map -- ? ) interval-at* nip ; inline
\r
51 : interval-values ( map -- values )
\r
52 check-interval-map array>> [ value ] map ;
\r
54 : <interval-map> ( specification -- map )
\r
55 all-intervals [ first-unsafe second-unsafe ] sort-with
\r
56 >intervals ensure-disjoint interval-map boa ;
\r
58 : <interval-set> ( specification -- map )
\r
59 dup zip <interval-map> ;
\r
61 :: coalesce ( alist -- specification )
\r
62 ! Only works with integer keys, because they're discrete
\r
65 alist sort-keys unclip swap [ first2 dupd ] dip
\r
66 [| oldkey oldval key val | ! Underneath is start
\r
69 [ oldkey 2array oldval 2array , key ] unless
\r
71 ] assoc-each [ 2array ] bi@ ,
\r