1 ! Copyright (C) 2006, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays classes combinators kernel make math
4 math.order math.parser sequences strings words ;
9 { out array read-only }
10 { terminated? read-only }
12 { out-var read-only } ;
14 : ?terminated ( out -- out terminated? )
15 dup { "*" } = [ drop { } t ] [ f ] if ;
17 : <effect> ( in out -- effect )
18 ?terminated f f effect boa ;
20 : <terminated-effect> ( in out terminated? -- effect )
21 f f effect boa ; inline
23 : <variable-effect> ( in-var in out-var out -- effect )
24 swap [ rot ] dip [ ?terminated ] 2dip effect boa ;
26 : effect-height ( effect -- n )
27 [ out>> length ] [ in>> length ] bi - ; inline
29 : variable-effect? ( effect -- ? )
30 [ in-var>> ] [ out-var>> ] bi or ;
31 : bivariable-effect? ( effect -- ? )
32 [ in-var>> ] [ out-var>> ] bi = not ;
34 : effect<= ( effect1 effect2 -- ? )
36 { [ over terminated?>> ] [ t ] }
37 { [ dup terminated?>> ] [ f ] }
38 { [ 2dup [ bivariable-effect? ] either? ] [ f ] }
39 { [ 2dup [ variable-effect? ] [ variable-effect? not ] bi* and ] [ f ] }
40 { [ 2dup [ in>> length ] bi@ > ] [ f ] }
41 { [ 2dup [ effect-height ] same? not ] [ f ] }
45 : effect= ( effect1 effect2 -- ? )
46 [ [ in>> length ] same? ]
47 [ [ out>> length ] same? ]
48 [ [ terminated?>> ] same? ]
51 GENERIC: effect>string ( obj -- str )
52 M: string effect>string ;
53 M: object effect>string drop "object" ;
54 M: word effect>string name>> ;
55 M: integer effect>string number>string ;
56 M: pair effect>string first2 [ effect>string ] bi@ ": " glue ;
58 : stack-picture ( seq -- string )
59 [ [ effect>string % CHAR: \s , ] each ] "" make ;
61 : var-picture ( var -- string )
65 M: effect effect>string ( effect -- string )
68 dup in-var>> var-picture %
69 dup in>> stack-picture % "-- " %
70 dup out-var>> var-picture %
71 dup out>> stack-picture %
72 dup terminated?>> [ "* " % ] when
77 GENERIC: effect>type ( obj -- type )
78 M: object effect>type drop object ;
80 M: pair effect>type second effect>type ;
81 M: classoid effect>type ;
83 : effect-in-types ( effect -- input-types )
84 in>> [ effect>type ] map ;
86 : effect-out-types ( effect -- input-types )
87 out>> [ effect>type ] map ;
89 GENERIC: stack-effect ( word -- effect/f )
92 [ "declared-effect" word-prop ]
93 [ parent-word dup [ stack-effect ] when ] bi or ;
95 M: deferred stack-effect call-next-method ( -- * ) or ;
98 [ in>> clone ] [ out>> clone ] bi <effect> ;
100 : stack-height ( word -- n )
101 stack-effect effect-height ; inline
103 : shuffle-mapping ( effect -- mapping )
104 [ out>> ] [ in>> ] bi [ index ] curry map ;
106 : shuffle ( stack shuffle -- newstack )
107 shuffle-mapping swap nths ;
109 : add-effect-input ( effect -- effect' )
110 [ in>> "obj" suffix ] [ out>> ] [ terminated?>> ] tri <terminated-effect> ;
112 : compose-effects ( effect1 effect2 -- effect' )
116 [ [ [ in>> length ] [ out>> length ] bi ] [ in>> length ] bi* swap [-] + ]
117 [ [ out>> length ] [ [ in>> length ] [ out>> length ] bi ] bi* [ [-] ] dip + ]
118 [ nip terminated?>> ] 2tri
119 [ [ "x" <array> ] bi@ ] dip
123 : curry-effect ( effect -- effect' )
124 [ in>> length ] [ out>> length ] [ terminated?>> ] tri
125 pick 0 = [ [ 1 + ] dip ] [ [ 1 - ] 2dip ] if
126 [ [ "x" <array> ] bi@ ] dip <terminated-effect> ;