https://github.com/daac-tools/crawdad

🦞 Rust library of natural language dictionaries using character-wise double-array tries.
https://github.com/daac-tools/crawdad

cjk-characters data-structures double-array no-std rust search trie

Last synced: about 1 month ago
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🦞 Rust library of natural language dictionaries using character-wise double-array tries.

• Host: GitHub
• URL: https://github.com/daac-tools/crawdad
• Owner: daac-tools
• License: apache-2.0
• Created: 2022-03-20T14:22:49.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2025-01-13T20:01:16.000Z (4 months ago)
• Last Synced: 2025-03-31T18:18:50.927Z (about 2 months ago)
• Topics: cjk-characters, data-structures, double-array, no-std, rust, search, trie
• Language: Rust
• Homepage: https://docs.rs/crawdad
• Size: 3.77 MB
• Stars: 30
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE-APACHE

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README

        
# 🦞 Crawdad: ChaRActer-Wise Double-Array Dictionary

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## Overview

Crawdad is a library of natural language dictionaries using character-wise double-array tries.

The implementation is optimized for strings of multibyte-characters,

and you can enjoy fast text processing on strings such as Japanese or Chinese.

For example, on a large Japanese dictionary of IPADIC+Neologd, Crawdad has a better time-space tradeoff than other Rust libraries.

![](./figures/neologd.svg)

The detailed experimental settings and other results are available on [Wiki](https://github.com/daac-tools/crawdad/wiki/Performance-Comparison).

### What can do

- **Key-value mapping**: Crawdad stores a set of string keys with mapping arbitrary integer values.

- **Exact match**: Crawdad supports a fast lookup for an input key.

- **Common prefix search**: Crawdad supports fast *common prefix search* that can be used to enumerate all keys appearing in a text.

### Data structures

Crawdad contains the two trie implementations:

- `crawdad::Trie` is a standard trie form that often provides the fastest queries.

- `crawdad::MpTrie` is a minimal-prefix trie form that is memory-efficient for long strings.

## Slack

We have a Slack workspace for developers and users to ask questions and discuss a variety of topics.

 * https://daac-tools.slack.com/

 * Please get an invitation from [here](https://join.slack.com/t/daac-tools/shared_invite/zt-1pwwqbcz4-KxL95Nam9VinpPlzUpEGyA).

## License

Licensed under either of

 * Apache License, Version 2.0

   ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)

 * MIT license

   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

## Acknowledgment

The initial version of this software was developed by LegalOn Technologies, Inc.,

but not an officially supported LegalOn Technologies product.

## Contribution

See [the guidelines](./CONTRIBUTING.md).