[Bug 198100] New port: devel/p5-Tree-Trie (Data structure optimized for prefix lookup)

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Sat Feb 28 16:46:05 UTC 2015


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198100

            Bug ID: 198100
           Summary: New port: devel/p5-Tree-Trie (Data structure optimized
                    for prefix lookup)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: gebhart at secnetix.de

Created attachment 153617
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153617&action=edit
shar file of ports files

This module implements a trie data structure. The term "trie" comes from the
word retrieval, but is generally pronounced like "try". A trie is a tree
structure (or directed acyclic graph), the nodes of which represent letters
in a word. For example, the final lookup for the word 'bob' would look
something like $ref->{'b'}{'o'}{'b'}{'00'} (the 00 being an end marker).
Only nodes which would represent words in the trie exist, making the structure
slightly smaller than a hash of the same data set.

The advantages of the trie over other data storage methods is that lookup times
are O(1) WRT the size of the index. For sparse data sets, it is probably not as
efficient as performing a binary search on a sorted list, and for small files,
it has a lot of overhead. The main advantage (at least from my perspective) is
that it provides a relatively cheap method for finding a list of words in a
large, dense data set which begin with a certain string.

WWW: http://search.cpan.org/dist/Tree-Trie/

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