49 lines
1.4 KiB
Factor
49 lines
1.4 KiB
Factor
! Copyright (C) 2008 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays assocs fry hashtables kernel sequences
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vectors regexp.utils ;
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IN: regexp.transition-tables
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TUPLE: transition from to obj ;
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TUPLE: literal-transition < transition ;
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TUPLE: class-transition < transition ;
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TUPLE: default-transition < transition ;
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TUPLE: literal obj ;
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TUPLE: class obj ;
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TUPLE: default ;
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: make-transition ( from to obj class -- obj )
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new
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swap >>obj
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swap >>to
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swap >>from ;
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: <literal-transition> ( from to obj -- transition )
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literal-transition make-transition ;
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: <class-transition> ( from to obj -- transition )
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class-transition make-transition ;
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: <default-transition> ( from to -- transition )
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t default-transition make-transition ;
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TUPLE: transition-table transitions start-state final-states ;
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: <transition-table> ( -- transition-table )
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transition-table new
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H{ } clone >>transitions
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H{ } clone >>final-states ;
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: maybe-initialize-key ( key hashtable -- )
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2dup key? [ 2drop ] [ H{ } clone -rot set-at ] if ;
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: set-transition ( transition hash -- )
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#! set the state as a key
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2dup [ to>> ] dip maybe-initialize-key
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[ [ to>> ] [ obj>> ] [ from>> ] tri ] dip
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2dup at* [ 2nip insert-at ]
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[ drop [ H{ } clone [ insert-at ] keep ] 2dip set-at ] if ;
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: add-transition ( transition transition-table -- )
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transitions>> set-transition ;
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