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 sequences.private 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 ;
32 : bivariable-effect? ( effect -- ? )
33 [ in-var>> ] [ out-var>> ] bi = not ;
35 : effect<= ( effect1 effect2 -- ? )
37 { [ over terminated?>> ] [ t ] }
38 { [ dup terminated?>> ] [ f ] }
39 { [ 2dup [ bivariable-effect? ] either? ] [ f ] }
40 { [ 2dup [ variable-effect? ] [ variable-effect? not ] bi* and ] [ f ] }
41 { [ 2dup [ in>> length ] bi@ > ] [ f ] }
42 { [ 2dup [ effect-height ] same? not ] [ f ] }
46 : effect= ( effect1 effect2 -- ? )
47 [ [ in>> length ] same? ]
48 [ [ out>> length ] same? ]
49 [ [ terminated?>> ] same? ]
52 GENERIC: effect>string ( obj -- str )
53 M: string effect>string ;
54 M: object effect>string drop "object" ;
55 M: word effect>string name>> ;
56 M: integer effect>string number>string ;
57 M: pair effect>string first2-unsafe [ effect>string ] bi@ ": " glue ;
59 : stack-picture ( seq -- string )
60 [ [ effect>string % CHAR: \s , ] each ] "" make ;
62 : var-picture ( var -- string )
66 M: effect effect>string ( effect -- string )
69 dup in-var>> var-picture %
70 dup in>> stack-picture % "-- " %
71 dup out-var>> var-picture %
72 dup out>> stack-picture %
73 dup terminated?>> [ "* " % ] when
78 GENERIC: effect>type ( obj -- type )
79 M: object effect>type drop object ;
81 M: pair effect>type second-unsafe effect>type ;
82 M: classoid effect>type ;
84 : effect-in-types ( effect -- input-types )
85 in>> [ effect>type ] map ;
87 : effect-out-types ( effect -- input-types )
88 out>> [ effect>type ] map ;
90 GENERIC: stack-effect ( word -- effect/f )
93 dup "declared-effect" word-prop [ nip ] [
94 parent-word dup [ stack-effect ] when
97 M: deferred stack-effect call-next-method ( -- * ) or ;
100 [ in>> clone ] [ out>> clone ] bi <effect> ;
102 : stack-height ( word -- n )
103 stack-effect effect-height ; inline
105 : shuffle-mapping ( effect -- mapping )
106 [ out>> ] [ in>> ] bi [ index ] curry map ;
108 : shuffle ( stack shuffle -- newstack )
109 shuffle-mapping swap nths ;
111 : add-effect-input ( effect -- effect' )
112 [ in>> "obj" suffix ] [ out>> ] [ terminated?>> ] tri
113 <terminated-effect> ;
115 : compose-effects ( effect1 effect2 -- effect' )
119 [ [ [ in>> length ] [ out>> length ] bi ] [ in>> length ] bi* swap [-] + ]
120 [ [ out>> length ] [ [ in>> length ] [ out>> length ] bi ] bi* [ [-] ] dip + ]
121 [ nip terminated?>> ] 2tri
122 [ [ "x" <array> ] bi@ ] dip
126 : curry-effect ( effect -- effect' )
127 [ in>> length ] [ out>> length ] [ terminated?>> ] tri
128 pick 0 = [ [ 1 + ] dip ] [ [ 1 - ] 2dip ] if
129 [ [ "x" <array> ] bi@ ] dip <terminated-effect> ;
131 ERROR: bad-stack-effect word expected got ;
133 : check-stack-effect ( word effect -- )
134 over stack-effect 2dup effect=
135 [ 3drop ] [ throw-bad-stack-effect ] if ;