1 ! Copyright (C) 2005, 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays generic hashtables kernel kernel.private math
4 namespaces make sequences words quotations layouts combinators
5 sequences.private classes classes.builtin classes.algebra
6 definitions math.order math.private ;
9 PREDICATE: math-class < class
10 dup null bootstrap-word eq? [
13 number bootstrap-word class<=
16 : last/first ( seq -- pair ) [ peek ] [ first ] bi 2array ;
18 : math-precedence ( class -- pair )
20 { [ dup null class<= ] [ drop { -1 -1 } ] }
21 { [ dup math-class? ] [ class-types last/first ] }
25 : math-class<=> ( class1 class2 -- class )
26 [ math-precedence ] compare +gt+ eq? ;
28 : math-class-max ( class1 class2 -- class )
29 [ math-class<=> ] most ;
31 : (math-upgrade) ( max class -- quot )
32 dupd = [ drop [ ] ] [ "coercer" word-prop [ ] or ] if ;
34 : math-upgrade ( class1 class2 -- quot )
35 [ math-class-max ] 2keep
38 dup empty? [ [ dip ] curry [ ] like ] unless
42 ERROR: no-math-method left right generic ;
44 : default-math-method ( generic -- quot )
45 [ no-math-method ] curry [ ] like ;
47 : applicable-method ( generic class -- quot )
50 [ default-math-method ] ?if ;
52 : object-method ( generic -- quot )
53 object bootstrap-word applicable-method ;
55 : math-method ( word class1 class2 -- quot )
58 2dup 2array , \ declare ,
60 math-class-max over order min-class applicable-method %
68 : math-vtable ( picker quot -- quot )
71 [ num-tags get swap [ bootstrap-type>class ] prepose map , ] bi*
75 TUPLE: math-combination ;
77 M: math-combination make-default-method
78 drop default-math-method ;
80 M: math-combination perform-combination
84 [ 2dup both-fixnums? ] %
85 dup fixnum bootstrap-word dup math-method ,
88 \ dup [ [ 2dup ] dip math-method ] math-vtable
96 PREDICATE: math-generic < generic ( word -- ? )
97 "combination" word-prop math-combination? ;
99 M: math-generic definer drop \ MATH: f ;