1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays definitions kernel kernel.private
4 slots.private math namespaces sequences strings vectors sbufs
5 quotations assocs hashtables sorting vocabs math.order sets
9 : word ( -- word ) \ word get-global ;
11 : set-word ( word -- ) \ word set-global ;
13 M: word execute (execute) ;
15 M: word ?execute execute( -- value ) ; inline
18 [ [ name>> ] [ vocabulary>> ] bi 2array ] compare ;
20 M: word definer drop \ : \ ; ;
22 M: word definition def>> ;
24 : word-prop ( word name -- value ) swap props>> at ;
26 : remove-word-prop ( word name -- ) swap props>> delete-at ;
28 : set-word-prop ( word value name -- )
30 [ pick props>> ?set-at >>props drop ]
31 [ nip remove-word-prop ] if ;
33 : change-word-prop ( word prop quot -- )
34 [ swap props>> ] dip change-at ; inline
36 : reset-props ( word seq -- ) [ remove-word-prop ] with each ;
40 : caller ( callstack -- word ) callstack>array <reversed> third ;
44 TUPLE: undefined word ;
45 : undefined ( -- * ) callstack caller \ undefined boa throw ;
47 : undefined-def ( -- quot )
48 #! 'f' inhibits tail call optimization in non-optimizing
49 #! compiler, ensuring that we can pull out the caller word
53 PREDICATE: deferred < word ( obj -- ? ) def>> undefined-def = ;
54 M: deferred definer drop \ DEFER: f ;
55 M: deferred definition drop f ;
57 PREDICATE: primitive < word ( obj -- ? ) "primitive" word-prop ;
58 M: primitive definer drop \ PRIMITIVE: f ;
59 M: primitive definition drop f ;
61 : lookup ( name vocab -- word ) vocab-words at ;
63 : target-word ( word -- target )
64 [ name>> ] [ vocabulary>> ] bi lookup ;
66 SYMBOL: bootstrapping?
68 : if-bootstrapping ( true false -- )
69 [ bootstrapping? get ] 2dip if ; inline
71 : bootstrap-word ( word -- target )
72 [ target-word ] [ ] if-bootstrapping ;
74 GENERIC: crossref? ( word -- ? )
77 dup "forgotten" word-prop [ drop f ] [ vocabulary>> >boolean ] if ;
79 GENERIC: subwords ( word -- seq )
81 M: word subwords drop f ;
83 GENERIC: parent-word ( word -- word/f )
85 M: word parent-word drop f ;
87 : define ( word def -- )
88 over changed-definition [ ] like >>def drop ;
90 : changed-effect ( word -- )
91 [ dup changed-effects get set-in-unit ]
92 [ dup primitive? [ drop ] [ changed-definition ] if ] bi ;
94 : set-stack-effect ( effect word -- )
95 2dup "declared-effect" word-prop = [ 2drop ] [
96 [ nip changed-effect ]
97 [ nip subwords [ changed-effect ] each ]
98 [ swap "declared-effect" set-word-prop ]
102 : define-declared ( word def effect -- )
103 [ nip swap set-stack-effect ] [ drop define ] 3bi ;
105 : make-deprecated ( word -- )
106 t "deprecated" set-word-prop ;
108 : inline? ( word -- ? ) "inline" word-prop ; inline
110 ERROR: cannot-be-inline word ;
112 GENERIC: make-inline ( word -- )
115 dup inline? [ drop ] [
116 [ t "inline" set-word-prop ]
121 : define-inline ( word def effect -- )
122 [ define-declared ] [ 2drop make-inline ] 3bi ;
124 : make-recursive ( word -- )
125 t "recursive" set-word-prop ;
127 GENERIC: flushable? ( word -- ? )
130 [ "flushable" word-prop ]
131 [ parent-word dup [ flushable? ] when ] bi or ;
133 : make-flushable ( word -- )
134 t "flushable" set-word-prop ;
136 GENERIC: foldable? ( word -- ? )
139 [ "foldable" word-prop ]
140 [ parent-word dup [ foldable? ] when ] bi or ;
142 : make-foldable ( word -- )
143 dup make-flushable t "foldable" set-word-prop ;
145 GENERIC: reset-word ( word -- )
148 dup flushable? [ dup changed-conditionally ] when
150 "unannotated-def" "parsing" "inline" "recursive"
151 "foldable" "flushable" "reading" "writing" "reader"
152 "writer" "delimiter" "deprecated"
155 : reset-generic ( word -- )
156 [ subwords forget-all ]
170 : <word> ( name vocab -- word )
171 2dup [ hashcode ] bi@ bitxor >fixnum (word) dup new-word ;
173 : <uninterned-word> ( name -- word )
174 f \ <uninterned-word> counter >fixnum (word)
175 new-words get [ dup new-word ] when ;
178 "( gensym )" <uninterned-word> ;
180 : define-temp ( quot effect -- word )
181 [ gensym dup ] 2dip define-declared ;
184 dup [ name>> ] [ vocabulary>> ] bi dup vocab-words
188 ERROR: bad-create name vocab ;
190 : check-create ( name vocab -- name vocab )
191 2dup [ string? ] [ [ string? ] [ vocab? ] bi or ] bi* and
192 [ bad-create ] unless ;
194 : create ( name vocab -- word )
195 check-create 2dup lookup
200 dup changed-definition
203 : constructor-word ( name vocab -- word )
204 [ "<" ">" surround ] dip create ;
206 PREDICATE: parsing-word < word "parsing" word-prop ;
208 M: parsing-word definer drop \ SYNTAX: \ ; ;
210 : define-syntax ( word quot -- )
211 [ drop ] [ define ] 2bi t "parsing" set-word-prop ;
213 : delimiter? ( obj -- ? )
214 dup word? [ "delimiter" word-prop ] [ drop f ] if ;
216 : deprecated? ( obj -- ? )
217 dup word? [ "deprecated" word-prop ] [ drop f ] if ;
219 ! Definition protocol
220 M: word where "loc" word-prop ;
222 M: word set-where swap "loc" set-word-prop ;
225 dup "forgotten" word-prop [ drop ] [
226 [ subwords forget-all ]
227 [ [ name>> ] [ vocabulary>> vocab-words ] bi delete-at ]
228 [ t "forgotten" set-word-prop ]
233 nip 1 slot { fixnum } declare ; inline foldable
235 M: word literalize <wrapper> ;
237 INSTANCE: word definition