jntajis-rs

A Rust port of jntajis-python, providing character transliteration functionality for Japanese text processing.

What's jntajis-rs?

jntajis-rs is a transliteration library specifically designed for dealing with three different character sets: JIS X 0208, JIS X 0213, and Unicode. This is a native Rust implementation that provides the same functionality as the original Python library.

use jntajis::codec::mj_shrink::{MJShrinkSchemes, mj_shrink_candidates};

fn main() {
    // Get shrink candidates for a character variant
    let candidates: Vec<String> = mj_shrink_candidates("髙島屋", MJShrinkSchemes::ALL)
        .take(5)
        .collect();
    println!("{:?}", candidates); // outputs variations including "高島屋"
}

Features

This library provides access to three different character tables:

• MJ character table (MJ文字一覧表) - A vast set of kanji characters used in Japanese text processing, developed by the Information-technology Promotion Agency
• MJ shrink conversion map (MJ縮退マップ) - For transliterating complex, less-frequently-used character variants to commonly-used ones
• NTA shrink conversion map (国税庁JIS縮退マップ) - Developed by Japan National Tax Agency to canonicalize user inputs

Usage

Add this to your Cargo.toml:

[dependencies]
jntajis = "0.2.0"

Basic Example

use jntajis::codec::mj_shrink::{MJShrinkScheme, MJShrinkSchemes, mj_shrink_candidates};

// Get all possible shrink candidates
let candidates: Vec<String> = mj_shrink_candidates("髙", MJShrinkSchemes::ALL)
    .take(10)
    .collect();

// Use specific shrink scheme
let jis_only = MJShrinkSchemes::builder()
    .with(MJShrinkScheme::JISIncorporationUCSUnificationRule);
let candidates: Vec<String> = mj_shrink_candidates("髙", jis_only)
    .take(5)
    .collect();

// Handle multiple characters
let candidates: Vec<String> = mj_shrink_candidates("髙橋", MJShrinkSchemes::ALL)
    .take(10)
    .collect();

Advanced Usage

The library supports various MJ shrink schemes:

• JISIncorporationUCSUnificationRule - JIS incorporation and UCS unification rules
• MOJNotice582 - MOJ Notice 582 transliteration rules
• MOJFamilyRegisterActRelatedNotice - Family register act related notice rules
• InferenceByReadingAndGlyph - Inference by reading and glyph rules

You can combine multiple schemes:

let combined = MJShrinkSchemes::builder()
    .with(MJShrinkScheme::JISIncorporationUCSUnificationRule)
    .with(MJShrinkScheme::MOJNotice582);

See examples/mj_shrink_example.rs for more detailed usage examples.

Examples

Run the included example:

cargo run --example mj_shrink_example

Building

# Standard build
cargo build

# Run tests
cargo test

Character Mapping Relationships

The relationship between Unicode, MJ character mappings, JIS X 0213, and JIS X 0208 follows the same structure as the original Python implementation:

• JNTA transliteration: Direct conversion using the JNTA character mappings table
• MJ transliteration: Two-phase process involving Unicode to MJ character mappings, then MJ shrink mappings

License

The source code is published under the BSD 3-clause license.

The embedded character mapping data comes from:

• JIS shrink conversion mappings (国税庁: JIS縮退マップ)

  • Publisher: National Tax Agency
  • Source: https://www.houjin-bangou.nta.go.jp/download/
  • License: CC BY 4.0

• MJ character table (文字情報技術促進協議会: MJ文字一覧表)

  • Publisher: Character Information Technology Promotion Council (CITPC)
  • Author: Information-technology Promotion Agency (IPA)
  • Source: https://moji.or.jp/mojikiban/mjlist/
  • License: CC BY-SA 2.1 JP

• MJ shrink conversion mappings (文字情報技術促進協議会: MJ縮退マップ)

  • Publisher: Character Information Technology Promotion Council (CITPC)
  • Author: Information-technology Promotion Agency (IPA)
  • Source: https://moji.or.jp/mojikiban/map/
  • License: CC BY-SA 2.1 JP

Related Projects

• jntajis-python - The original Python implementation