https://github.com/kondrak/tinyexpr-rs

Tiny recursive descent expression parser, compiler, and evaluation engine for math expressions.
https://github.com/kondrak/tinyexpr-rs

evaluation-engine math-expressions rust tinyexpr-rs

Last synced: about 1 month ago
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Tiny recursive descent expression parser, compiler, and evaluation engine for math expressions.

• Host: GitHub
• URL: https://github.com/kondrak/tinyexpr-rs
• Owner: kondrak
• License: mit
• Created: 2016-09-03T15:26:43.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2023-07-11T21:31:03.000Z (almost 2 years ago)
• Last Synced: 2025-03-26T10:21:12.603Z (about 2 months ago)
• Topics: evaluation-engine, math-expressions, rust, tinyexpr-rs
• Language: Rust
• Size: 31.3 KB
• Stars: 11
• Watchers: 1
• Forks: 1
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# tinyexpr-rs

[![Crates.io](https://img.shields.io/crates/v/tinyexpr.svg)](https://crates.io/crates/tinyexpr)

[![Documentation](https://docs.rs/tinyexpr/badge.svg)](https://docs.rs/tinyexpr)

[![CI](https://github.com/kondrak/tinyexpr-rs/actions/workflows/rust.yml/badge.svg)](https://github.com/kondrak/tinyexpr-rs/actions/workflows/rust.yml)

[![Coverage Status](https://coveralls.io/repos/github/kondrak/tinyexpr-rs/badge.svg?branch=master)](https://coveralls.io/github/kondrak/tinyexpr-rs?branch=master)

![](https://img.shields.io/crates/l/json.svg)

Tiny recursive descent expression parser, compiler, and evaluation engine for math expressions.

This is a WIP port of [TinyExpr](https://github.com/codeplea/tinyexpr) to Rust. Current release only supports built-in system functions (trigonometry, algebraic operations, constants, etc.). See the `tests` module for more examples.

[Documentation](https://docs.rs/tinyexpr)

Usage

-----

```toml

# Cargo.toml

[dependencies]

tinyexpr = "0.1"

```

Example

-------

```rust

extern crate tinyexpr;

fn main()

{

    // parse the expression and fetch result

    let r = tinyexpr::interp("2+2*2").unwrap();

    // should print "6"

    println!("{:?}", r);

}

```

Build instructions

------------------

```

cargo build

cargo run --example tinyexpr

```

## Todo

- support custom user functions

- support functions taking more than 2 parameters

- support closures

## 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)