---

name: rust-bindings description: "Guides Rust ltp crate and ltp-cffi workflows for legacy CWS/POS/NER model loading, features, builds, and diagnostics." disable-model-invocation: true metadata: disco-role: operating license: CC BY-NC 4.0

Rust Bindings

Use this sub-skill for native Rust or C workflows around LTP's legacy CWS/POS/NER implementation.

Choose this route when

• The user asks for the Rust crate ltp, CWSModel, POSModel, NERModel, ModelSerde, Cargo features, or Rust examples.
• The task involves ltp-cffi, static/dynamic C library builds, C headers/symbols, or linking a C program to LTP.
• The user needs to diagnose missing Rust toolchains, feature flags, or legacy model binary paths.

For Python ltp_extension wrappers, use ../legacy-extension/SKILL.md. For neural Python inference/training, use the Python sub-skills.

Safe workflow

1. Run the static checker against a checkout or staged source tree:

   python scripts/check_rust_layout.py --repo-root /path/to/ltp-checkout
   

   It checks manifests, toolchain presence, feature hints, and optional legacy model files. It does not build by default.

2. For Rust model loading, enable required features:

   [dependencies]
   ltp = { version = "0.1", features = ["serialization", "parallel"] }
   itertools = "0.14"
   apache-avro = "0.18"
   

3. Use model files explicitly:

   use std::fs::File;
   use ltp::{CWSModel, POSModel, NERModel, ModelSerde, Format, Codec};
   
   let cws: CWSModel = ModelSerde::load(File::open("cws_model.bin")?, Format::AVRO(Codec::Deflate))?;
   

4. Build ltp-cffi only after Rust and a C toolchain are intentionally available.

Read these references

• references/rust-api.md for crate features, model loading, prediction sequence, and utility APIs.
• references/cffi-reference.md for the C binding build/linking surface.
• references/troubleshooting.md for missing toolchain, features, model files, and linker issues.

Boundaries

• This skill does not ship legacy model binaries or build artifacts.
• Rust/C examples require cargo/rustc and model files; the production environment that created this skill did not verify local Rust builds.
• Do not route Python wheel install problems here unless they involve the source Rust extension boundary; use root packaging and legacy-extension guidance first.