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 ;
9 { hashcode fixnum initial: 0 } name vocabulary
10 { def quotation initial: [ ] } props pic-def pic-tail-def
11 { sub-primitive read-only } ;
13 PRIMITIVE: word-code ( word -- start end )
14 PRIMITIVE: word-optimized? ( word -- ? )
17 PRIMITIVE: (word) ( name vocab hashcode -- word )
20 : last-word ( -- word ) \ last-word get-global ;
22 : set-last-word ( word -- ) \ last-word set-global ;
24 M: word execute (execute) ;
26 M: word <=> [ [ name>> ] [ vocabulary>> ] bi 2array ] compare ;
28 M: word definer drop \ : \ ; ;
30 M: word definition def>> ;
32 : word-prop ( word name -- value ) swap props>> at ;
34 : remove-word-prop ( word name -- ) swap props>> delete-at ;
36 : remove-word-props ( word seq -- )
37 swap props>> [ delete-at ] curry each ;
39 : set-word-prop ( word value name -- )
41 [ pick props>> ?set-at >>props drop ]
42 [ nip remove-word-prop ] if ;
44 : change-word-prop ( ..a word prop quot: ( ..a value -- ..b newvalue ) -- ..b )
45 [ swap props>> ] dip change-at ; inline
49 : caller ( callstack -- word )
50 callstack>array first ;
54 TUPLE: undefined-word word ;
56 : undefined ( -- * ) get-callstack caller undefined-word boa throw ;
58 : undefined-def ( -- quot )
59 ! 'f' inhibits tail call optimization in non-optimizing
60 ! compiler, ensuring that we can pull out the caller word
64 PREDICATE: deferred < word def>> undefined-def = ;
65 M: deferred definer drop \ DEFER: f ;
66 M: deferred definition drop f ;
68 PREDICATE: primitive < word "primitive" word-prop ;
69 M: primitive definer drop \ PRIMITIVE: f ;
70 M: primitive definition drop f ;
72 ERROR: invalid-primitive vocabulary word effect ;
73 : ensure-primitive ( vocabulary word effect -- )
75 [ drop vocabulary>> = ]
76 [ drop nip primitive? ]
77 [ [ nip "declared-effect" word-prop ] dip = ] 3tri and and
78 [ 3drop ] [ invalid-primitive ] if ;
80 : lookup-word ( name vocab -- word ) vocab-words-assoc at ;
82 : target-word ( word -- target )
83 [ name>> ] [ vocabulary>> ] bi lookup-word ;
85 SYMBOL: bootstrapping?
87 : if-bootstrapping ( true false -- )
88 [ bootstrapping? get ] 2dip if ; inline
90 : bootstrap-word ( word -- target )
91 [ target-word ] [ ] if-bootstrapping ;
93 GENERIC: crossref? ( word -- ? )
96 dup "forgotten" word-prop [ drop f ] [ vocabulary>> >boolean ] if ;
98 GENERIC: subwords ( word -- seq )
100 M: word subwords drop f ;
102 GENERIC: parent-word ( word -- word/f )
104 M: word parent-word drop f ;
106 : define ( word def -- )
107 over changed-definition [ ] like >>def drop ;
109 : changed-effect ( word -- )
110 [ changed-effects get add-to-unit ]
111 [ dup primitive? [ drop ] [ changed-definition ] if ] bi ;
113 : set-stack-effect ( word effect -- )
114 2dup [ "declared-effect" word-prop ] dip =
116 [ drop changed-effect ]
117 [ drop subwords [ changed-effect ] each ]
118 [ "declared-effect" set-word-prop ]
122 : define-declared ( word def effect -- )
123 [ nip set-stack-effect ] [ drop define ] 3bi ;
125 : make-deprecated ( word -- )
126 t "deprecated" set-word-prop ;
128 : word-prop? ( obj string -- ? )
129 over word? [ word-prop ] [ 2drop f ] if ; inline
131 : inline? ( obj -- ? ) "inline" word-prop? ; inline
133 : recursive? ( obj -- ? ) "recursive" word-prop? ; inline
135 : inline-recursive? ( obj -- ? )
136 dup inline? [ recursive? ] [ drop f ] if ; inline
138 ERROR: cannot-be-inline word ;
140 GENERIC: make-inline ( word -- )
143 dup inline? [ drop ] [
144 [ t "inline" set-word-prop ]
149 : define-inline ( word def effect -- )
150 [ define-declared ] [ 2drop make-inline ] 3bi ;
152 : make-recursive ( word -- )
153 t "recursive" set-word-prop ;
155 GENERIC: flushable? ( word -- ? )
158 [ "flushable" word-prop ]
159 [ parent-word dup [ flushable? ] when ] bi or ;
161 : make-flushable ( word -- )
162 t "flushable" set-word-prop ;
164 GENERIC: foldable? ( word -- ? )
167 [ "foldable" word-prop ]
168 [ parent-word dup [ foldable? ] when ] bi or ;
170 : make-foldable ( word -- )
172 [ t "foldable" set-word-prop ] bi ;
174 GENERIC: reset-word ( word -- )
177 dup flushable? [ dup changed-conditionally ] when
179 "unannotated-def" "parsing" "inline" "recursive"
180 "foldable" "flushable" "reading" "writing" "reader"
181 "writer" "delimiter" "deprecated"
182 } remove-word-props ;
184 : reset-generic ( word -- )
185 [ subwords forget-all ]
199 : <word> ( name vocab -- word )
200 over hashcode over hashcode hash-combine >fixnum (word) dup new-word ;
202 : <uninterned-word> ( name -- word )
203 f \ <uninterned-word> counter >fixnum (word)
204 new-words get [ dup new-word ] when ;
207 "( gensym )" <uninterned-word> ;
209 : define-temp ( quot effect -- word )
210 [ gensym dup ] 2dip define-declared ;
213 dup [ name>> ] [ vocabulary>> ] bi dup vocab-words-assoc
214 [ ] [ no-vocab ] ?if set-at ;
216 ERROR: bad-create name vocab ;
218 : check-create ( name vocab -- name vocab )
219 2dup [ string? ] [ [ string? ] [ vocab? ] bi or ] bi* and
220 [ bad-create ] unless ;
222 : create-word ( name vocab -- word )
223 check-create 2dup lookup-word
227 dup changed-definition
230 PREDICATE: parsing-word < word "parsing" word-prop ;
232 M: parsing-word definer drop \ SYNTAX: \ ; ;
234 : define-syntax ( word quot -- )
235 [ drop ] [ define ] 2bi t "parsing" set-word-prop ;
237 : delimiter? ( obj -- ? ) "delimiter" word-prop? ;
239 : deprecated? ( obj -- ? ) "deprecated" word-prop? ;
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-assoc ] bi delete-at ]
250 [ t "forgotten" set-word-prop ]
254 ! Can be foldable because the hashcode itself is immutable
256 nip 1 slot { fixnum } declare ; inline foldable
258 M: word literalize <wrapper> ;
260 INSTANCE: word definition-mixin