Ogma (named after the this guy) is a library to create Natural Language DSLs. Specifically, the library provides convenience macros for wrapping a function with implementations to parse parameters from English.

Examples

# use ogma::vm::{Context, Trap};
# use ogma::object_query::Query;
# use ogma::given;
#[given(Add, "the addition of q`input` and d`constant` henceforth q`out`")]
fn add<'a>(
ctx: &mut Context,
input: &Vec<Query<'a>>,
constant: i32,
out: &Vec<Query<'a>>,
) -> Result<(), Trap> {
// get global variable from `ctx` using `input`, add `constant` to it
// and save to `ctx` via `out`
Ok(())
}

which you can then use in a Script

let mut ctx = bdd::Step::new();
let script = Module::compile(
&mut ctx,
r#"
Given the addition of the input and 2 henceforth the left
And the product of the input and 2 henceforth the right
When the left is equal to the right
Then do nothing
"#,
)
.unwrap();
let mut instance = script.instance();
instance.ctx_mut().set_global::<_, i32>("input", 2);
assert!(instance.exec().is_ok());