75 lines
1.7 KiB
Factor
75 lines
1.7 KiB
Factor
! Copyright (C) 2008, 2009 Doug Coleman, Daniel Ehrenberg.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel arrays accessors fry sequences regexp.classes
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math.ranges math ;
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IN: regexp.ast
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TUPLE: negation term ;
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C: <negation> negation
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TUPLE: from-to n m ;
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C: <from-to> from-to
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TUPLE: at-least n ;
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C: <at-least> at-least
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TUPLE: tagged-epsilon tag ;
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C: <tagged-epsilon> tagged-epsilon
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CONSTANT: epsilon T{ tagged-epsilon { tag t } }
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TUPLE: concatenation first second ;
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: <concatenation> ( seq -- concatenation )
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[ epsilon ] [ unclip [ concatenation boa ] reduce ] if-empty ;
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TUPLE: alternation first second ;
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: <alternation> ( seq -- alternation )
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unclip [ alternation boa ] reduce ;
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TUPLE: star term ;
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C: <star> star
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TUPLE: with-options tree options ;
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C: <with-options> with-options
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TUPLE: options on off ;
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C: <options> options
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SINGLETONS: unix-lines dotall multiline case-insensitive reversed-regexp ;
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: <maybe> ( term -- term' )
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f <concatenation> 2array <alternation> ;
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: <plus> ( term -- term' )
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dup <star> 2array <concatenation> ;
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: repetition ( n term -- term' )
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<array> <concatenation> ;
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GENERIC: <times> ( term times -- term' )
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M: at-least <times>
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n>> swap [ repetition ] [ <star> ] bi 2array <concatenation> ;
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: to-times ( term n -- ast )
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dup zero?
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[ 2drop epsilon ]
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[ dupd 1- to-times 2array <concatenation> <maybe> ]
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if ;
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M: from-to <times>
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[ n>> swap repetition ]
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[ [ m>> ] [ n>> ] bi - to-times ] 2bi
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2array <concatenation> ;
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: char-class ( ranges ? -- term )
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[ <or-class> ] dip [ <not-class> ] when ;
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TUPLE: lookahead term ;
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C: <lookahead> lookahead
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TUPLE: lookbehind term ;
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C: <lookbehind> lookbehind
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