45 lines
1.4 KiB
Factor
45 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 ;
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IN: regexp2.transition-tables
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: insert-at ( value key hash -- )
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2dup at* [
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2nip push
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] [
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drop >r >r dup vector? [ 1vector ] unless r> r> set-at
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] if ;
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: ?insert-at ( value key hash/f -- hash )
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[ H{ } clone ] unless* [ insert-at ] keep ;
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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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: <literal-transition> ( from to obj -- transition ) literal-transition boa ;
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: <class-transition> ( from to obj -- transition ) class-transition boa ;
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: <default-transition> ( from to -- transition ) t default-transition boa ;
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TUPLE: transition-table transitions
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literals classes defaults
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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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: set-transition ( transition hash -- )
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>r [ to>> ] [ obj>> ] [ from>> ] tri r>
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2dup at* [ 2nip insert-at ]
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[ drop >r >r H{ } clone [ insert-at ] keep r> r> set-at ] if ;
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: add-transition ( transition transition-table -- )
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transitions>> set-transition ;
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