65 lines
1.8 KiB
Factor
65 lines
1.8 KiB
Factor
! Copyright (C) 2003, 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: kernel-internals
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USING: vectors sequences ;
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: namestack* ( -- namestack )
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3 getenv { vector } declare ; inline
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: >n ( namespace -- ) namestack* push ;
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: n> ( -- namespace ) namestack* pop ;
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IN: namespaces
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USING: arrays hashtables kernel kernel-internals math strings
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words ;
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: namestack ( -- namestack ) namestack* clone ; inline
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: set-namestack ( namestack -- ) >vector 3 setenv ; inline
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: namespace ( -- namespace ) namestack* peek ;
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: ndrop ( -- ) namestack* pop* ;
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: global ( -- g ) 4 getenv { hashtable } declare ; inline
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: get ( variable -- value ) namestack* hash-stack ;
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: set ( value variable -- ) namespace set-hash ; inline
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: on ( variable -- ) t swap set ; inline
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: off ( variable -- ) f swap set ; inline
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: get-global ( variable -- value ) global hash ; inline
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: set-global ( value variable -- ) global set-hash ; inline
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: nest ( variable -- namespace )
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dup namespace hash [ ] [ >r H{ } clone dup r> set ] ?if ;
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: change ( variable quot -- )
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>r dup get r> rot slip set ; inline
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: +@ ( n variable -- ) [ [ 0 ] unless* + ] change ;
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: inc ( variable -- ) 1 swap +@ ; inline
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: dec ( variable -- ) -1 swap +@ ; inline
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: bind ( ns quot -- ) swap >n call ndrop ; inline
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: counter ( variable -- n ) global [ dup inc get ] bind ;
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: make-hash ( quot -- hash ) H{ } clone >n call n> ; inline
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: with-scope ( quot -- ) H{ } clone >n call ndrop ; inline
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! Building sequences
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SYMBOL: building
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: make ( quot exemplar -- seq )
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>r
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[ V{ } clone building set call building get ] with-scope
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r> like ; inline
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: , ( elt -- ) building get push ;
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: % ( seq -- ) building get swap nappend ;
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: init-namespaces ( -- ) global 1array set-namestack ;
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IN: sequences
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: join ( seq glue -- newseq )
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[ swap [ % ] [ dup % ] interleave drop ] over make ;
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