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 ! Need a dummy word here because BUILTIN: word is not a real word
15 ! and parse-datum looks for things that are actually words instead of
16 ! also looking for classes
17 : word ( -- * ) "dummy word" throw ;
19 SYMBOL: last-word-symbol
21 : last-word ( -- word ) \ last-word-symbol get-global ;
23 : set-last-word ( word -- ) \ last-word-symbol set-global ;
25 M: word execute (execute) ;
27 M: word ?execute execute( -- value ) ; inline
30 [ [ name>> ] [ vocabulary>> ] bi 2array ] compare ;
32 M: word definer drop \ : \ ; ;
34 M: word definition def>> ;
36 : word-prop ( word name -- value ) swap props>> at ;
38 : remove-word-prop ( word name -- ) swap props>> delete-at ;
40 : set-word-prop ( word value name -- )
42 [ pick props>> ?set-at >>props drop ]
43 [ nip remove-word-prop ] if ;
45 : change-word-prop ( ..a word prop quot: ( ..a value -- ..b newvalue ) -- ..b )
46 [ swap props>> ] dip change-at ; inline
48 : reset-props ( word seq -- ) [ remove-word-prop ] with each ;
52 : caller ( callstack -- word ) callstack>array <reversed> third ;
56 TUPLE: undefined word ;
57 : undefined ( -- * ) callstack caller \ undefined boa throw ;
59 : undefined-def ( -- quot )
60 #! 'f' inhibits tail call optimization in non-optimizing
61 #! compiler, ensuring that we can pull out the caller word
65 PREDICATE: deferred < word def>> undefined-def = ;
66 M: deferred definer drop \ DEFER: f ;
67 M: deferred definition drop f ;
69 PREDICATE: primitive < word "primitive" word-prop ;
70 M: primitive definer drop \ PRIMITIVE: f ;
71 M: primitive definition drop f ;
73 : lookup-word ( name vocab -- word ) vocab-words at ;
75 : target-word ( word -- target )
76 [ name>> ] [ vocabulary>> ] bi lookup-word ;
78 SYMBOL: bootstrapping?
80 : if-bootstrapping ( true false -- )
81 [ bootstrapping? get ] 2dip if ; inline
83 : bootstrap-word ( word -- target )
84 [ target-word ] [ ] if-bootstrapping ;
86 GENERIC: crossref? ( word -- ? )
89 dup "forgotten" word-prop [ drop f ] [ vocabulary>> >boolean ] if ;
91 GENERIC: subwords ( word -- seq )
93 M: word subwords drop f ;
95 GENERIC: parent-word ( word -- word/f )
97 M: word parent-word drop f ;
99 : define ( word def -- )
100 over changed-definition [ ] like >>def drop ;
102 : changed-effect ( word -- )
103 [ changed-effects get add-to-unit ]
104 [ dup primitive? [ drop ] [ changed-definition ] if ] bi ;
106 : set-stack-effect ( effect word -- )
107 2dup "declared-effect" word-prop = [ 2drop ] [
108 [ nip changed-effect ]
109 [ nip subwords [ changed-effect ] each ]
110 [ swap "declared-effect" set-word-prop ]
114 : define-declared ( word def effect -- )
115 [ nip swap set-stack-effect ] [ drop define ] 3bi ;
117 : make-deprecated ( word -- )
118 t "deprecated" set-word-prop ;
120 : inline? ( obj -- ? )
121 dup word? [ "inline" word-prop ] [ drop f ] if ; inline
123 : recursive? ( obj -- ? )
124 dup word? [ "recursive" word-prop ] [ drop f ] if ; inline
126 : inline-recursive? ( obj -- ? )
128 dup "inline" word-prop
129 [ "recursive" word-prop ] [ drop f ] if
130 ] [ drop f ] if ; inline
132 ERROR: cannot-be-inline word ;
134 GENERIC: make-inline ( word -- )
137 dup inline? [ drop ] [
138 [ t "inline" set-word-prop ]
143 : define-inline ( word def effect -- )
144 [ define-declared ] [ 2drop make-inline ] 3bi ;
146 : make-recursive ( word -- )
147 t "recursive" set-word-prop ;
149 GENERIC: flushable? ( word -- ? )
152 [ "flushable" word-prop ]
153 [ parent-word dup [ flushable? ] when ] bi or ;
155 : make-flushable ( word -- )
156 t "flushable" set-word-prop ;
158 GENERIC: foldable? ( word -- ? )
161 [ "foldable" word-prop ]
162 [ parent-word dup [ foldable? ] when ] bi or ;
164 : make-foldable ( word -- )
165 dup make-flushable t "foldable" set-word-prop ;
167 GENERIC: reset-word ( word -- )
170 dup flushable? [ dup changed-conditionally ] when
172 "unannotated-def" "parsing" "inline" "recursive"
173 "foldable" "flushable" "reading" "writing" "reader"
174 "writer" "delimiter" "deprecated"
177 : reset-generic ( word -- )
178 [ subwords forget-all ]
192 : <word> ( name vocab -- word )
193 2dup 0 hash-combine hash-combine >fixnum (word) dup new-word ;
195 : <uninterned-word> ( name -- word )
196 f \ <uninterned-word> counter >fixnum (word)
197 new-words get [ dup new-word ] when ;
200 "( gensym )" <uninterned-word> ;
202 : define-temp ( quot effect -- word )
203 [ gensym dup ] 2dip define-declared ;
206 dup [ name>> ] [ vocabulary>> ] bi dup vocab-words
210 ERROR: bad-create name vocab ;
212 : check-create ( name vocab -- name vocab )
213 2dup [ string? ] [ [ string? ] [ vocab? ] bi or ] bi* and
214 [ bad-create ] unless ;
216 : create ( name vocab -- word )
217 check-create 2dup lookup-word
222 dup changed-definition
225 : constructor-word ( name vocab -- word )
226 [ "<" ">" surround ] dip create ;
228 PREDICATE: parsing-word < word "parsing" word-prop ;
230 M: parsing-word definer drop \ SYNTAX: \ ; ;
232 : define-syntax ( word quot -- )
233 [ drop ] [ define ] 2bi t "parsing" set-word-prop ;
235 : delimiter? ( obj -- ? )
236 dup word? [ "delimiter" word-prop ] [ drop f ] if ;
238 : deprecated? ( obj -- ? )
239 dup word? [ "deprecated" word-prop ] [ drop f ] if ;
241 ! Definition protocol
242 M: word where "loc" word-prop ;
244 M: word set-where swap "loc" set-word-prop ;
247 dup "forgotten" word-prop [ drop ] [
248 [ subwords forget-all ]
249 [ [ name>> ] [ vocabulary>> vocab-words ] bi delete-at ]
250 [ t "forgotten" set-word-prop ]
255 nip 1 slot { fixnum } declare ; inline foldable
257 M: word literalize <wrapper> ;
259 INSTANCE: word definition-mixin