80 lines
2.2 KiB
Factor
80 lines
2.2 KiB
Factor
! Based on Clojure's PersistentHashMap by Rich Hickey.
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USING: math math.bitwise arrays kernel accessors locals sequences
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sequences.private
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persistent.sequences
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persistent.hashtables.config
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persistent.hashtables.nodes ;
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IN: persistent.hashtables.nodes.bitmap
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: index ( bit bitmap -- n ) [ 1 - ] dip bitand bit-count ; inline
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M:: bitmap-node (entry-at) ( key hashcode bitmap-node -- entry )
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bitmap-node shift>> :> shift
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hashcode shift bitpos :> bit
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bitmap-node bitmap>> :> bitmap
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bitmap-node nodes>> :> nodes
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bitmap bit bitand 0 eq? [ f ] [
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key hashcode
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bit bitmap index nodes nth-unsafe
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(entry-at)
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] if ;
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M:: bitmap-node (new-at) ( shift value key hashcode bitmap-node -- node' added-leaf )
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bitmap-node shift>> :> shift
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hashcode shift bitpos :> bit
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bitmap-node bitmap>> :> bitmap
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bit bitmap index :> idx
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bitmap-node nodes>> :> nodes
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bitmap bit bitand 0 eq? [
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value key hashcode <leaf-node> :> new-leaf
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bitmap bit bitor
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new-leaf idx nodes insert-nth
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shift
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<bitmap-node>
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new-leaf
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] [
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idx nodes nth :> n
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shift radix-bits + value key hashcode n (new-at) :> ( n' new-leaf )
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n n' eq? [
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bitmap-node
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] [
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bitmap
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n' idx nodes new-nth
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shift
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<bitmap-node>
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] if
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new-leaf
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] if ;
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M:: bitmap-node (pluck-at) ( key hashcode bitmap-node -- node' )
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hashcode bitmap-node shift>> bitpos :> bit
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bitmap-node bitmap>> :> bitmap
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bitmap-node nodes>> :> nodes
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bitmap-node shift>> :> shift
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bit bitmap bitand 0 eq? [ bitmap-node ] [
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bit bitmap index :> idx
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idx nodes nth-unsafe :> n
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key hashcode n (pluck-at) :> n'
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n n' eq? [
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bitmap-node
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] [
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n' [
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bitmap
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n' idx nodes new-nth
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shift
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<bitmap-node>
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] [
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bitmap bit eq? [ f ] [
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bitmap bit bitnot bitand
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idx nodes remove-nth
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shift
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<bitmap-node>
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] if
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] if
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] if
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] if ;
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M: bitmap-node >alist% ( node -- ) nodes>> >alist-each% ;
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