README.md

datalogic-rs

A high-performance Rust implementation of JSONLogic that provides a way to write portable logic rules as JSON. Fully compliant with the JSONLogic specification and optimized for production use.

Overview

datalogic-rs offers a complete, thread-safe implementation of the JSONLogic specification with:

• 💯 100% compliance with official JSONLogic test suite
• 🛡️ Strong type safety and error handling
• 📦 Zero external runtime dependencies (only serde_json)
• 🚀 Optimized performance with zero-copy deserialization
• 🧵 Thread-safe design using Arc for operator sharing

Installation

Add to your Cargo.toml:

[dependencies]
datalogic-rs = "2.0.0"

Quick Example

use datalogic_rs::JsonLogic;
use serde_json::json;

fn main() {
    // Complex discount rule example
    let discount_rule = json!({
        "if": [
            {"and": [
                {">": [{"var": "cart.total"}, 100]},
                {"==": [{"var": "user.membership"}, "premium"]}
            ]},
            {"*": [{"var": "cart.total"}, 0.75]}, // 25% discount
            {"*": [{"var": "cart.total"}, 1.0]}   // no discount
        ]
    });

    let data = json!({
        "cart": {
            "total": 120.00
        },
        "user": {
            "membership": "premium"
        }
    });

    let rule = Rule::from_value(&discount_rule).unwrap();
    let price = JsonLogic::apply(&rule, &data).unwrap();
    assert_eq!(price, json!(90.0)); // 25% off 120
}

Supported Operations

All JSONLogic operations are supported:

• Comparison: ==, ===, !=, !==, >, >=, <, <=
• Logic: !, !!, or, and, if, ?:
• Numeric: +, -, *, /, %, min, max
• Array: map, filter, reduce, all, none, some, merge
• String: substr, cat, in
• Data: var, missing, missing_some
• Custom: preserve for data preservation

Performance

The library is optimized for production use with:

• Efficient operator dispatch using Arc
• Zero-copy JSON handling
• Optional auto-traversal of nested rules
• Comprehensive benchmarking suite

Testing

100% compatibility with official JSONLogic tests:

cargo test        # Run unit tests
cargo bench      # Run performance benchmarks

License

Licensed under Apache-2.0

Contributing

Contributions are welcome! The codebase has extensive documentation and test coverage.