chem-parse 
A parser for simple chemical formulas.
Get Started
Add the dependency to your Cargo.toml file.
toml
[dependencies]
chem-parse = "0.1.0"
Parse a forumula unit
```rs
use std::error::Error;
use chem_parse::parse;
fn main() -> Result<(), Box> {
let string = String::from("Fe2O3");
let ast = parse(string)?;
// Ast: ForumulaUnit(1, [Element(2, "Fe"), Element(3, "O")])
println!("Ast: {:?}", ast);
Ok(())
}
```
Parse an equation
```rs
use std::error::Error;
use chem_parse::parse;
fn main() -> Result<(), Box> {
let string = String::from("4Fe+3O2->2Fe2O");
let ast = parse(string)?;
// Node: comment broken up into multiple lines to save space
// Ast: Equation(
// Reactants([ForumulaUnit(4, [Element(1, "Fe")]), ForumulaUnit(3, [Element(2, "O")])]),
// Products([ForumulaUnit(2, [Element(2, "Fe"), Element(1, "O")])])
// )
println!("Ast: {:?}", ast);
Ok(())
}
```