1 ! Copyright (C) 2004, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs definitions hashtables kernel
4 kernel.private math math.order namespaces quotations sequences
5 slots.private strings vocabs ;
6 FROM: assocs => change-at ;
10 { hashcode fixnum initial: 0 } name vocabulary
11 { def quotation initial: [ ] } props pic-def pic-tail-def
12 { sub-primitive read-only } ;
14 : word ( -- word ) \ word get-global ;
16 : set-word ( word -- ) \ word set-global ;
18 M: word execute (execute) ;
20 M: word ?execute execute( -- value ) ; inline
23 [ [ name>> ] [ vocabulary>> ] bi 2array ] compare ;
25 M: word definer drop \ : \ ; ;
27 M: word definition def>> ;
29 : word-prop ( word name -- value ) swap props>> at ;
31 : remove-word-prop ( word name -- ) swap props>> delete-at ;
33 : set-word-prop ( word value name -- )
35 [ pick props>> ?set-at >>props drop ]
36 [ nip remove-word-prop ] if ;
38 : change-word-prop ( ..a word prop quot: ( ..a value -- ..b newvalue ) -- ..b )
39 [ swap props>> ] dip change-at ; inline
41 : reset-props ( word seq -- ) [ remove-word-prop ] with each ;
45 : caller ( callstack -- word ) callstack>array <reversed> third ;
49 TUPLE: undefined word ;
50 : undefined ( -- * ) callstack caller \ undefined boa throw ;
52 : undefined-def ( -- quot )
53 #! 'f' inhibits tail call optimization in non-optimizing
54 #! compiler, ensuring that we can pull out the caller word
58 PREDICATE: deferred < word def>> undefined-def = ;
59 M: deferred definer drop \ DEFER: f ;
60 M: deferred definition drop f ;
62 PREDICATE: primitive < word "primitive" word-prop ;
63 M: primitive definer drop \ PRIMITIVE: f ;
64 M: primitive definition drop f ;
66 : lookup-word ( name vocab -- word ) vocab-words at ;
68 : target-word ( word -- target )
69 [ name>> ] [ vocabulary>> ] bi lookup-word ;
71 SYMBOL: bootstrapping?
73 : if-bootstrapping ( true false -- )
74 [ bootstrapping? get ] 2dip if ; inline
76 : bootstrap-word ( word -- target )
77 [ target-word ] [ ] if-bootstrapping ;
79 GENERIC: crossref? ( word -- ? )
82 dup "forgotten" word-prop [ drop f ] [ vocabulary>> >boolean ] if ;
84 GENERIC: subwords ( word -- seq )
86 M: word subwords drop f ;
88 GENERIC: parent-word ( word -- word/f )
90 M: word parent-word drop f ;
92 : define ( word def -- )
93 over changed-definition [ ] like >>def drop ;
95 : changed-effect ( word -- )
96 [ dup changed-effects get set-in-unit ]
97 [ dup primitive? [ drop ] [ changed-definition ] if ] bi ;
99 : set-stack-effect ( effect word -- )
100 2dup "declared-effect" word-prop = [ 2drop ] [
101 [ nip changed-effect ]
102 [ nip subwords [ changed-effect ] each ]
103 [ swap "declared-effect" set-word-prop ]
107 : define-declared ( word def effect -- )
108 [ nip swap set-stack-effect ] [ drop define ] 3bi ;
110 : make-deprecated ( word -- )
111 t "deprecated" set-word-prop ;
113 : inline? ( word -- ? ) "inline" word-prop ; inline
115 : inline-recursive? ( word -- ? )
116 dup "inline" word-prop
117 [ "recursive" word-prop ] [ drop f ] if ; inline
119 ERROR: cannot-be-inline word ;
121 GENERIC: make-inline ( word -- )
124 dup inline? [ drop ] [
125 [ t "inline" set-word-prop ]
130 : define-inline ( word def effect -- )
131 [ define-declared ] [ 2drop make-inline ] 3bi ;
133 : make-recursive ( word -- )
134 t "recursive" set-word-prop ;
136 GENERIC: flushable? ( word -- ? )
139 [ "flushable" word-prop ]
140 [ parent-word dup [ flushable? ] when ] bi or ;
142 : make-flushable ( word -- )
143 t "flushable" set-word-prop ;
145 GENERIC: foldable? ( word -- ? )
148 [ "foldable" word-prop ]
149 [ parent-word dup [ foldable? ] when ] bi or ;
151 : make-foldable ( word -- )
152 dup make-flushable t "foldable" set-word-prop ;
154 GENERIC: reset-word ( word -- )
157 dup flushable? [ dup changed-conditionally ] when
159 "unannotated-def" "parsing" "inline" "recursive"
160 "foldable" "flushable" "reading" "writing" "reader"
161 "writer" "delimiter" "deprecated"
164 : reset-generic ( word -- )
165 [ subwords forget-all ]
179 : <word> ( name vocab -- word )
180 2dup 0 hash-combine hash-combine >fixnum (word) dup new-word ;
182 : <uninterned-word> ( name -- word )
183 f \ <uninterned-word> counter >fixnum (word)
184 new-words get [ dup new-word ] when ;
187 "( gensym )" <uninterned-word> ;
189 : define-temp ( quot effect -- word )
190 [ gensym dup ] 2dip define-declared ;
193 dup [ name>> ] [ vocabulary>> ] bi dup vocab-words
197 ERROR: bad-create name vocab ;
199 : check-create ( name vocab -- name vocab )
200 2dup [ string? ] [ [ string? ] [ vocab? ] bi or ] bi* and
201 [ bad-create ] unless ;
203 : create ( name vocab -- word )
204 check-create 2dup lookup-word
209 dup changed-definition
212 : constructor-word ( name vocab -- word )
213 [ "<" ">" surround ] dip create ;
215 PREDICATE: parsing-word < word "parsing" word-prop ;
217 M: parsing-word definer drop \ SYNTAX: \ ; ;
219 : define-syntax ( word quot -- )
220 [ drop ] [ define ] 2bi t "parsing" set-word-prop ;
222 : delimiter? ( obj -- ? )
223 dup word? [ "delimiter" word-prop ] [ drop f ] if ;
225 : deprecated? ( obj -- ? )
226 dup word? [ "deprecated" word-prop ] [ drop f ] if ;
228 ! Definition protocol
229 M: word where "loc" word-prop ;
231 M: word set-where swap "loc" set-word-prop ;
234 dup "forgotten" word-prop [ drop ] [
235 [ subwords forget-all ]
236 [ [ name>> ] [ vocabulary>> vocab-words ] bi delete-at ]
237 [ t "forgotten" set-word-prop ]
242 nip 1 slot { fixnum } declare ; inline foldable
244 M: word literalize <wrapper> ;
246 INSTANCE: word definition