Crate formula

Formula

A parser and evaluator of spreadsheet-like formulas

Formula is in its early stages and is not ready for production use.

So far we have the following features:

• 18 date time functions
• 26 text functions
• 26 math functions
• 7 logical functions
• 2 web functions
• plus all arithmetic and comparison operators

Installation and usage

Rust

Add this library to your project with cargo add formula or add formula = "*" to your Cargo.toml file.

Use it similar to the following code:

use formula::{Formula, Expr, Result};

fn main() -> Result<()> {
    let formula = Formula::new("=UPPER(TRIM('   Hello '))")?;
    let value = formula.parse()?;
    assert_eq!(value, Expr::String("HELLO".to_string()));
    Ok(())
}

JavaScript

Add this library to your project with npm install formula-wasm or add formula-wasm to your package.json file.

Use it similar to the following code:

import { parse } from 'formula-wasm';

const value = parse('=UPPER(TRIM("   Hello "))');
console.assert(value, "HELLO");

What we do not support, yet:

• We don’t support all existing functions in the world, but we would like to add more of them, like Excel functions, Google Sheets functions, and so on
• At the moment, we don’t support table data. It means you need to extract table data and pass theirs values to this library
• We do not support simple formulas like 1+1 or as argument like AND(1>3, 1<3) or SUM(2-1, 2). Instead, you can use our F. functions like AND(F.GT(1, 3), F.LT(1, 3)) or SUM(F.SUB(2, 1), 2)
• We still do not support parentheses to change the order of operations, but you can use our F. functions. So for example instead of 2*(1+1), you should use F.MUL(2, F.ADD(1, 1))

Contributing

We would love to have your contribution! Please read our contributing guidelines to get started.

Inspired by

• formulajs
• hyperformula

License

This project is licensed under the MIT license. See the LICENSE file for more info.

Modules

error

Structs

Formula

Formula, is the main struct and entry point of this library.

Enums

Expr

Expr is the result of parsing a formula.

Rule

Type Aliases

Result