87 lines
2.7 KiB
Factor
87 lines
2.7 KiB
Factor
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!:folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: namespaces
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USE: arithmetic
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USE: combinators
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USE: hashtables
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USE: kernel
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USE: lists
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USE: stack
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USE: vectors
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DEFER: namespace
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: namestack* ( -- ns ) 3 getenv ;
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: set-namestack* ( ns -- ) 3 setenv ;
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: global ( -- g ) 4 getenv ;
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: set-global ( g -- ) 4 setenv ;
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: namespace-buckets 23 ;
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: <namespace> ( -- n )
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#! Create a new namespace.
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namespace-buckets <hashtable> ;
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: get* ( var namespace -- value ) hash ;
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: set* ( value variable namespace -- ) set-hash ;
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: put* swapd set* ;
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: namestack-search ( var n -- )
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#! Internal word for searching the namestack.
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dup 0 eq? [
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2drop f ( not found )
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] [
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pred 2dup >r >r namestack* vector-nth hash* dup [
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r> drop r> drop ( [ key | value ] -- ) cdr ( found )
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] [
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drop r> r> namestack-search ( check next entry )
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] ifte
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] ifte ;
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: get ( variable -- value )
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#! Push the value of a variable by searching the namestack
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#! from the top down.
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namestack* vector-length namestack-search ;
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: set ( value variable -- ) namespace set* ;
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: put ( variable value -- ) namespace put* ;
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: vars ( -- list ) namespace hash-keys ;
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: values ( -- list ) namespace hash-values ;
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: vars-values ( -- list ) namespace hash>alist ;
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! We don't have bound objects in native Factor.
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: namespace? hashtable? ;
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: namespace-of ;
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: this namespace ;
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: has-namespace? hashtable? ;
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! We don't have a workspace in native Factor.
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: <table> <namespace> ;
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