86 lines
2.6 KiB
Factor
86 lines
2.6 KiB
Factor
! :folding=indent:collapseFolds=1:
|
|
|
|
! $Id$
|
|
!
|
|
! Copyright (C) 2004 Slava Pestov.
|
|
!
|
|
! Redistribution and use in source and binary forms, with or without
|
|
! modification, are permitted provided that the following conditions are met:
|
|
!
|
|
! 1. Redistributions of source code must retain the above copyright notice,
|
|
! this list of conditions and the following disclaimer.
|
|
!
|
|
! 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
! this list of conditions and the following disclaimer in the documentation
|
|
! and/or other materials provided with the distribution.
|
|
!
|
|
! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
|
|
! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
IN: namespaces
|
|
USE: combinators
|
|
USE: hashtables
|
|
USE: kernel
|
|
USE: lists
|
|
USE: math
|
|
USE: stack
|
|
USE: strings
|
|
USE: vectors
|
|
|
|
DEFER: namespace
|
|
|
|
: namestack ( -- ns ) 3 getenv ;
|
|
: set-namestack ( ns -- ) 3 setenv ;
|
|
|
|
: >n ( namespace -- n:namespace )
|
|
#! Push a namespace on the namespace stack.
|
|
namestack cons set-namestack ; inline
|
|
|
|
: n> ( n:namespace -- namespace )
|
|
#! Pop the top of the namespace stack.
|
|
namestack uncons set-namestack ; inline
|
|
|
|
: global ( -- g ) 4 getenv ;
|
|
: set-global ( g -- ) 4 setenv ;
|
|
|
|
: init-namespaces ( -- )
|
|
global >n global "global" set ;
|
|
|
|
: namespace-buckets 23 ;
|
|
|
|
: <namespace> ( -- n )
|
|
#! Create a new namespace.
|
|
namespace-buckets <hashtable> ;
|
|
|
|
: (get) ( var ns -- value )
|
|
#! Internal word for searching the namestack.
|
|
dup [
|
|
2dup car hash* dup [
|
|
nip nip cdr ( found )
|
|
] [
|
|
drop cdr (get) ( keep looking )
|
|
] ifte
|
|
] [
|
|
2drop f
|
|
] ifte ;
|
|
|
|
: get ( variable -- value )
|
|
#! Push the value of a variable by searching the namestack
|
|
#! from the top down.
|
|
namestack (get) ;
|
|
|
|
: set ( value variable -- ) namespace set-hash ;
|
|
: put ( variable value -- ) swap set ;
|
|
|
|
: bind ( namespace quot -- )
|
|
#! Execute a quotation with a namespace on the namestack.
|
|
swap >n call n> drop ; inline
|