159 lines
4.1 KiB
Factor
159 lines
4.1 KiB
Factor
! Copyright (C) 2005, 2010 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel math math.order strings arrays vectors sequences
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sequences.private accessors fry combinators.short-circuit
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combinators ;
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IN: grouping
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<PRIVATE
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MIXIN: chunking
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INSTANCE: chunking sequence
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GENERIC: group@ ( n groups -- from to seq )
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M: chunking set-nth group@ <slice> 0 swap copy ;
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M: chunking like drop { } like ; inline
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MIXIN: subseq-chunking
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INSTANCE: subseq-chunking chunking
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INSTANCE: subseq-chunking sequence
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M: subseq-chunking nth group@ subseq ; inline
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MIXIN: slice-chunking
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INSTANCE: slice-chunking chunking
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INSTANCE: slice-chunking sequence
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M: slice-chunking nth group@ <slice> ; inline
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M: slice-chunking nth-unsafe group@ slice boa ; inline
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MIXIN: abstract-groups
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INSTANCE: abstract-groups sequence
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M: abstract-groups length
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[ seq>> length ] [ n>> ] bi [ + 1 - ] keep /i ; inline
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M: abstract-groups set-length
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[ n>> * ] [ seq>> ] bi set-length ; inline
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M: abstract-groups group@
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[ n>> [ * dup ] keep + ] [ seq>> ] bi [ length min ] keep ; inline
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MIXIN: abstract-clumps
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INSTANCE: abstract-clumps sequence
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M: abstract-clumps length
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[ seq>> length 1 + ] [ n>> ] bi [-] ; inline
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M: abstract-clumps set-length
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[ n>> + 1 - ] [ seq>> ] bi set-length ; inline
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M: abstract-clumps group@
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[ n>> over + ] [ seq>> ] bi ; inline
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TUPLE: chunking-seq { seq read-only } { n read-only } ;
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: check-groups ( n -- n )
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dup 0 <= [ "Invalid group count" throw ] when ; inline
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: new-groups ( seq n class -- groups )
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[ check-groups ] dip boa ; inline
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: slice-mod ( n length -- n' )
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2dup >= [ - ] [ drop ] if ; inline
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: check-circular-clumps ( seq n -- seq n )
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2dup { [ nip 0 <= ] [ swap length > ] } 2||
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[ "Invalid clump size" throw ] when ; inline
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PRIVATE>
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TUPLE: groups < chunking-seq ;
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INSTANCE: groups subseq-chunking
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INSTANCE: groups abstract-groups
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: <groups> ( seq n -- groups )
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groups new-groups ; inline
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TUPLE: sliced-groups < chunking-seq ;
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INSTANCE: sliced-groups slice-chunking
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INSTANCE: sliced-groups abstract-groups
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: <sliced-groups> ( seq n -- groups )
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sliced-groups new-groups ; inline
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TUPLE: clumps < chunking-seq ;
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INSTANCE: clumps subseq-chunking
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INSTANCE: clumps abstract-clumps
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: <clumps> ( seq n -- clumps )
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clumps new-groups ; inline
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TUPLE: sliced-clumps < chunking-seq ;
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INSTANCE: sliced-clumps slice-chunking
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INSTANCE: sliced-clumps abstract-clumps
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: <sliced-clumps> ( seq n -- clumps )
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sliced-clumps new-groups ; inline
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: group ( seq n -- array ) <groups> { } like ;
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: clump ( seq n -- array ) <clumps> { } like ;
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: monotonic? ( seq quot -- ? )
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over length 2 < [ 2drop t ] [
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over length 2 = [
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[ first2-unsafe ] dip call
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] [
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[ 2 <sliced-clumps> ] dip
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'[ first2-unsafe @ ] all?
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] if
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] if ; inline
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: all-equal? ( seq -- ? ) [ = ] monotonic? ;
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: all-eq? ( seq -- ? ) [ eq? ] monotonic? ;
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TUPLE: circular-slice
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{ from read-only }
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{ to read-only }
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{ seq read-only } ;
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INSTANCE: circular-slice virtual-sequence
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M: circular-slice equal? over slice? [ sequence= ] [ 2drop f ] if ;
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M: circular-slice hashcode* [ sequence-hashcode ] recursive-hashcode ;
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M: circular-slice length [ to>> ] [ from>> ] bi - ; inline
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M: circular-slice virtual-exemplar seq>> ; inline
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M: circular-slice virtual@
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[ from>> + ] [ seq>> ] bi [ length slice-mod ] keep ; inline
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C: <circular-slice> circular-slice
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TUPLE: sliced-circular-clumps < chunking-seq ;
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INSTANCE: sliced-circular-clumps sequence
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M: sliced-circular-clumps length
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seq>> length ; inline
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M: sliced-circular-clumps nth
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[ n>> over + ] [ seq>> ] bi <circular-slice> ; inline
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: <sliced-circular-clumps> ( seq n -- clumps )
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check-circular-clumps sliced-circular-clumps boa ; inline
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TUPLE: circular-clumps < chunking-seq ;
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INSTANCE: circular-clumps sequence
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M: circular-clumps length
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seq>> length ; inline
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M: circular-clumps nth
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[ n>> over + ] [ seq>> ] bi [ <circular-slice> ] [ like ] bi ; inline
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: <circular-clumps> ( seq n -- clumps )
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check-circular-clumps circular-clumps boa ; inline
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: circular-clump ( seq n -- array )
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<circular-clumps> { } like ; inline
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