127 lines
3.9 KiB
Factor
127 lines
3.9 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2003, 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: combinators
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USE: kernel
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USE: lists
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USE: logic
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USE: stack
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USE: strings
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USE: vectors
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! Other languages have classes, objects, variables, etc.
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! Factor has similar concepts.
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!
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! 5 "x" set
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! "x" get 2 + .
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! 7
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! 7 "x" set
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! "x" get 2 + .
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! 9
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!
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! get ( name -- value ) and set ( value name -- ) search in
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! the namespaces on the namespace stack, in top-down order.
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!
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! At the bottom of the namespace stack, is the global
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! namespace; it is always present.
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!
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! bind ( namespace quot -- ) executes a quotation with a
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! namespace pushed on the namespace stack.
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: namestack ( -- stack )
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#! Push a copy of the namespace stack; same naming
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#! convention as the primitives datastack and callstack.
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namestack* clone ; inline
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: set-namestack ( stack -- )
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#! Set the namespace stack to a copy of another stack; same
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#! naming convention as the primitives datastack and
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#! callstack.
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clone set-namestack* ; inline
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: >n ( namespace -- n:namespace )
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#! Push a namespace on the namespace stack.
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namestack* vector-push ; inline
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: n> ( n:namespace -- namespace )
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#! Pop the top of the namespace stack.
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namestack* vector-pop ; inline
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: namespace ( -- namespace )
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#! Push the current namespace.
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namestack* vector-peek ; inline
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: bind ( namespace quot -- )
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#! Execute a quotation with a namespace on the namestack.
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swap namespace-of >n call n> drop ; inline
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: with-scope ( quot -- )
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#! Execute a quotation with a new namespace on the
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#! namestack.
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<namespace> >n call n> drop ;
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: extend ( object code -- object )
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#! Used in code like this:
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#! : <subclass>
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#! <superclass> [
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#! ....
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#! ] extend ;
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over >r bind r> ; inline
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: lazy ( var [ a ] -- value )
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#! If the value of the variable is f, set the value to the
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#! result of evaluating [ a ].
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over get [ drop get ] [ dip dupd set ] ifte ;
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: alist> ( alist namespace -- )
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#! Set each key in the alist to its value in the
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#! namespace.
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[ [ unswons set ] each ] bind ;
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: alist>namespace ( alist -- namespace )
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<namespace> tuck alist> ;
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: object-path-traverse ( name object -- object )
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dup has-namespace? [ get* ] [ 2drop f ] ifte ;
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: object-path-iter ( object list -- object )
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[
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uncons [ swap object-path-traverse ] dip
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object-path-iter
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] when* ;
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: object-path ( list -- object )
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#! An object path is a list of strings. Each string is a
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#! variable name in the object namespace at that level.
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#! Returns f if any of the objects are not set.
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this swap object-path-iter ;
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: on ( var -- ) t put ;
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: off ( var -- ) f put ;
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: toggle ( var -- ) dup get not put ;
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