proteus 0.5.0

Proteus is intended to make dynamic transformation of data using serde serializable, deserialize using JSON and a JSON transformation syntax similar to Javascript JSON syntax. It also supports registering custom Actions to be used in the syntax.
Documentation 
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use proteus::{actions, TransformBuilder};
use serde::{Deserialize, Serialize};
use std::error::Error;

#[derive(Serialize)]
struct KV {
    pub key: String,
}

#[derive(Serialize)]
struct Nested {
    pub inner: KV,
    pub my_arr: Vec<Option<String>>,
}

#[derive(Serialize)]
struct Address {
    pub street: String,
    pub postal: String,
    pub country: String,
}

#[derive(Serialize)]
struct RawUserInfo {
    pub user_id: String,
    pub first_name: String,
    pub last_name: String,
    pub addresses: Vec<Address>,
    pub nested: Nested,
}

#[derive(Serialize, Deserialize)]
struct User {
    pub id: String,
    #[serde(rename = "full-name")]
    pub full_name: String,
    pub address: String,
    pub prev_nested: String,
    pub my_arr: Vec<Option<String>>,
}

// This example show the basic usage of transformations
fn main() -> Result<(), Box<dyn Error>> {
    let input = RawUserInfo {
        user_id: "111".to_string(),
        first_name: "Dean".to_string(),
        last_name: "Karn".to_string(),
        addresses: vec![
            Address {
                street: "26 Here Blvd".to_string(),
                postal: "123456".to_string(),
                country: "Canada".to_string(),
            },
            Address {
                street: "26 Lakeside Cottage Lane.".to_string(),
                postal: "654321".to_string(),
                country: "Canada".to_string(),
            },
        ],
        nested: Nested {
            inner: KV {
                key: "value".to_string(),
            },
            my_arr: vec![None, Some("arr_value".to_owned()), None],
        },
    };
    let trans = TransformBuilder::default()
        .add_actions(actions!(
            ("user_id", "id"),
            (
                r#"join(" ", const("Mr."), first_name, last_name)"#,
                "full-name"
            ),
            (
                r#"join(", ", addresses[0].street, addresses[0].postal, addresses[0].country)"#,
                "address"
            ),
            ("nested.inner.key", "prev_nested"),
            ("nested.my_arr", "my_arr"),
            (r#"const("arr_value_2")"#, "my_arr[]")
        )?)
        .build()?;
    let res: User = trans.apply_to(input)?;
    println!("{}", serde_json::to_string_pretty(&res)?);
    Ok(())
}