loot-condition-interpreter

A library for parsing and evaluating LOOT's metadata condition strings. It provides:

• Support for metadata syntax v0.26 condition strings.
• Condition string parsing without evaluation, for checking syntax.
• Evaluation of parsed condition strings.
• Efficient and safe concurrent condition evaluation thanks to Rust's safety guarantees.
• Caching of individual function evaluation results and calculated CRCs.
• Executable version parsing without any external runtime dependencies.
• Lots of tests, and benchmarks.
• A C FFI library that wraps the Rust library.

Build

Make sure you have Rust installed.

To build the Rust and C FFI libraries, run:

cargo build --release --package loot-condition-interpreter-ffi

Use cbindgen to generate a C++ header file:

cbindgen ffi/ -o ffi/include/loot_condition_interpreter.h

Tests & Benchmarks

The tests and benchmarks need the testing-plugins and the LOOT API v0.13.8 Windows archives to be extracted and present in the repo root. See the GitHub Actions CI workflow for examples on what should be extracted where.

To run the Rust tests:

cargo test --workspace

To run the benchmarks:

cargo bench

There are also C++ tests for the FFI library, they require a C++ toolchain and CMake to be installed. To run the C++ tests:

mkdir ffi/build
cd ffi/build
cmake ..
cmake --build .
ctest