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monotonic-split works on empty seqs

db4
Doug Coleman 2008-06-27 19:40:46 -05:00
parent fd1d1387a4
commit 90624a8764
1 changed files with 6 additions and 2 deletions
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8
extra/sequences/lib/lib.factor
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@ -106,17 +106,21 @@ MACRO: firstn ( n -- )
: v, ( -- ) V{ } clone , ;
: ,v ( -- ) building get dup peek empty? [ dup pop* ] when drop ;
: monotonic-split ( seq quot -- newseq )
: (monotonic-split) ( seq quot -- newseq )
[
>r dup unclip suffix r>
v, [ pick ,, call [ v, ] unless ] curry 2each ,v
] { } make ;
: monotonic-split ( seq quot -- newseq )
over empty? [ 2drop { } ] [ (monotonic-split) ] if ;
: delete-random ( seq -- value )
[ length random ] keep [ nth ] 2keep delete-nth ;
ERROR: element-not-found ;
: split-around ( seq quot -- before elem after )
dupd find over [ "Element not found" throw ] unless
dupd find over [ element-not-found ] unless
>r cut rest r> swap ; inline
: (map-until) ( quot pred -- quot )