artsy

Crates.ioartsy
lib.rsartsy
version0.1.1
sourcesrc
created_at2019-02-16 18:57:02.326699
updated_at2019-02-18 13:56:53.480823
descriptionART Tree data structure library.
homepage
repositoryhttps://github.com/jmcomets/artsy
max_upload_size
id115216
size41,459
crates-io (github:technocreatives:crates-io)

documentation

https://docs.rs/artsy

README

artsy

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Documentation

A work-in-progress implementation of an ART Tree.

Features

Terminator Customization

Although the original ART paper only considers ASCII strings as keys, therefore defines \0 as string terminator, the idea can be extended to UTF-8 by using 0xff as string terminator. Of course, you can use any terminator if you're inserting raw bytes.

By default, you should use for_utf8() if you're using String keys.

Terminator customization is why each lookup/insertion/deletion method returns a Result<.., KeyContainsTerminator>; each method is also accompanied by a equivalent unchecked version.

Filtering used node types

Although the original ART paper uses 4 different types of nodes (4, 16, 48 and 256 children), you may not want the node types used for sparser tries or the intermediate node types (for whatever reason). Each node type, other than the final trie node of 256 children, may be disabled by building without its feature flag enabled:

cargo build --features "node4" # only use the smallest node, fallback to Node256

cargo build --features "node4 node16" # disable Node48

cargo build --features "node16" # only use the intermediate node with SIMD search

Disabling SIMD for Node16

SIMD should be enabled by default (if you system supports it). To explicitly disable SIMD, build with the feature no-simd set.

Examples

Insert / Lookup

let mut map = Trie::for_utf8();
map.insert(b"a", 0).unwrap();
map.insert(b"ac", 1).unwrap();

assert_eq!(map.get(b"a").unwrap(), Some(&0));
assert_eq!(map.get(b"ac").unwrap(), Some(&1));
assert_eq!(map.get(b"ab").unwrap(), None);

Todo List

  • Refactor insert/update child, removing duplication & extra find after insertion
  • Key/Value/Items Iterator
  • Deletion
  • Path Compression
Commit count: 37

cargo fmt