My Little Eval

My Little Eval is a lightweight Rust library for evaluating mathematical expressions. It provides a simple and intuitive way to parse and calculate mathematical expressions in your Rust programs.

Features

• Parsing and evaluation of mathematical expressions
• Supported Types integer (i32), float (f64) and strings (String)
• Support for basic arithmetic operations (+, -, *, /, %)
• Parentheses for controlling operator precedence
• Variable substitution

Supported Operations

| Type | Type | + | - | * | / | % | |---------|--------|---|---|---|---|---| | Int | Int |✔️ |✔️ |✔️|✔️ |✔️| | Int | Float |✔️ |✔️ |✔️|✔️ |✔️| | Int | String |✔️ |❌ |✔️|❌ |❌| | Float | Float | ✔️|✔️ |✔️|✔️ |✔️| | Float | Int | ✔️|✔️ |✔️|✔️ |✔️| | Float | String | ✔️|❌ |❌|❌ |❌| | String | String | ✔️|❌ |❌|❌ |❌| | String | Int | ✔️|❌ |✔️|❌ |❌| | String | Float | ✔️|❌ |❌|❌ |❌|

Installation

Add the following line to your Cargo.toml file

toml [dependencies] my-little-eval = "0.1.0" or run sh cargo add my-little-eval

Examples

Lookup the Documentation for more infos!

```rust use std::collections::HashMap; use mylittleeval::{eval, varsinit, typeenum::Type};

let mut variables = vars_init();

// Inserting variables into the HashMap variables.insert("x".tostring(), Type::Int(42)); variables.insert("y".tostring(), Type::Float(3.14));

// Using the eval function to evaluate an equation let equation = "2 * x + y"; let result = eval(equation, Some(&variables));

assert_eq!(result, Ok(Type::from("87.14"))); ```

Git Clone or Fork

If u clone or fork this git u can test the library with the included main.rs file. It contains a little CLI Shell wrapper around it.
sh $ cargo run Finished dev [unoptimized + debuginfo] target(s) in 0.00s Running `target\debug\my-little-eval.exe` run help for instructions Run help for instructions ```sh

help help page: Define a variable with the let keyword eg. let hallo = 2 Evaluate a term eg. ( 1 + hallo ) * 2 Quit the program with command q || quit Print out all variables with command vars Print this help page

```

Examples

```rust

let a = 5
let b = 7 * 2
let c = a + b
c
res: i32 = 19 res * c
res: i32 = 361 (2 * (777 / 12))
res: i32 = 128 let hallo = hi
hallo * a
res: String = "hihihihihi" let foo = 7.5
let bar = 3.5
foo % bar
res: f64 = 0.5 ```