50 lines
1.4 KiB
Factor
50 lines
1.4 KiB
Factor
USING: kernel math sequences strings ;
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IN: sequences-contrib
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: 3nth ( n seq -- slice ) >r dup 3 + r> <slice> ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: map3-i ( seq -- i ) length 2 - ;
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: map3-quot ( quot -- quot ) [ swap 3nth ] swap append ;
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: map3 ( seq quot -- seq ) over map3-i swap map3-quot map-with ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: (rtrim*) ( seq quot -- newseq )
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over length 0 > [
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2dup >r peek r> call
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[ >r dup length 1- head-slice r> (rtrim*) ] [ drop ] if
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] [
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drop
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] if ;
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: rtrim* ( seq quot -- newseq ) [ (rtrim*) ] 2keep drop like ;
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: rtrim ( seq -- newseq ) [ blank? ] rtrim* ;
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: (ltrim*) ( seq quot -- newseq )
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over length 0 > [
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2dup >r first r> call [ >r 1 tail-slice r> (ltrim*) ] [ drop ] if
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] [
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drop
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] if ;
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: ltrim* ( seq quot -- newseq ) [ (ltrim*) ] 2keep drop like ;
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: ltrim ( seq -- newseq ) [ blank? ] ltrim* ;
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: trim* ( seq quot -- newseq ) [ (ltrim*) ] keep rtrim* ;
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: trim ( seq -- newseq ) [ blank? ] trim* ;
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: ?head-slice ( seq begin -- newseq ? )
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2dup head? [ length tail-slice t ] [ drop f ] if ;
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: ?tail-slice ( seq end -- newseq ? )
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2dup tail? [ length head-slice* t ] [ drop f ] if ;
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: unclip-slice ( seq -- rest first )
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dup 1 tail-slice swap first ;
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PROVIDE: contrib/sequences ;
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