1 ! Copyright (C) 2003, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays assocs hashtables kernel kernel.private math
7 FROM: accessors => boxes>> value>> value<< ;
12 TUPLE: global-hashtable
13 { boxes hashtable read-only } ;
14 TUPLE: global-box value ;
16 : (box-at) ( key globals -- box )
18 [ 2nip ] [ [ f global-box boa ] 2dip [ set-at ] 2curry keep ] if* ; foldable
20 : box-at ( key globals -- box )
21 (box-at) { global-box } declare ; inline
23 M: global-hashtable at*
24 box-at value>> dup ; inline
26 M: global-hashtable set-at
27 box-at value<< ; inline
29 M: global-hashtable delete-at
30 box-at f swap value<< ; inline
32 : namestack* ( -- namestack )
33 CONTEXT-OBJ-NAMESTACK context-object { vector } declare ; inline
34 : >n ( namespace -- ) namestack* push ;
35 : ndrop ( -- ) namestack* pop* ;
39 : global ( -- g ) OBJ-GLOBAL special-object { global-hashtable } declare ; foldable
41 : namespace ( -- namespace ) namestack* last ; inline
42 : namestack ( -- namestack ) namestack* clone ;
43 : set-namestack ( namestack -- )
44 >vector CONTEXT-OBJ-NAMESTACK set-context-object ;
45 : init-namespaces ( -- ) global 1array set-namestack ;
46 : get ( variable -- value ) namestack* assoc-stack ; inline
47 : set ( value variable -- ) namespace set-at ;
48 : on ( variable -- ) t swap set ; inline
49 : off ( variable -- ) f swap set ; inline
50 : get-global ( variable -- value ) global at ; inline
51 : set-global ( value variable -- ) global set-at ; inline
52 : change ( variable quot -- ) [ [ get ] keep ] dip dip set ; inline
53 : change-global ( variable quot -- ) [ global ] dip change-at ; inline
54 : toggle ( variable -- ) [ not ] change ; inline
55 : +@ ( n variable -- ) [ 0 or + ] change ; inline
56 : inc ( variable -- ) 1 swap +@ ; inline
57 : dec ( variable -- ) -1 swap +@ ; inline
58 : with-variables ( ns quot -- ) swap >n call ndrop ; inline
59 : counter ( variable -- n ) [ 0 or 1 + dup ] change-global ;
60 : make-assoc ( quot exemplar -- hash ) 20 swap new-assoc [ swap with-variables ] keep ; inline
61 : with-scope ( quot -- ) 5 <hashtable> swap with-variables ; inline
62 : with-variable ( value key quot -- ) [ associate ] dip with-variables ; inline
63 : with-new-scope ( quot -- ) 5 <hashtable> swap with-variables ; inline
64 : with-global ( quot -- ) [ global ] dip with-variables ; inline
65 : initialize ( variable quot -- ) [ unless* ] curry change-global ; inline