edn-rs

Near Stable no breaking changes expected.

Crate to parse and emit EDN

• This lib does not make effort to conform the EDN received to EDN Spec. The lib that generated this EDN should be responsible for this. For more information on Edn Spec please visit: https://github.com/edn-format/edn.

Current example usage in:

• crate transistor;
• atm-crux;
• Rust/Clojure FFI. Deserialize Clojure Edn into Rust Struct;

Usage

Cargo.toml

[dependencies]
edn-rs = "0.16.2"

Simple time-only benchmarks of edn-rs agains Clojure Edn

• Link to benchmarks implementation here

Quick reference

Parse an EDN token into a Edn with edn! macro:

use edn_rs::{
    edn, Edn, List
};

fn main() {
    let edn = edn!((sym 1.2 3 false :f nil 3/4));
    let expected = Edn::List(
        List::new(
            vec![
                Edn::Symbol("sym".to_string()),
                Edn::Double(1.2.into()),
                Edn::Int(3),
                Edn::Bool(false),
                Edn::Key(":f".to_string()),
                Edn::Nil,
                Edn::Rational("3/4".to_string())
            ]
        )
    );

    println!("{:?}", edn);
    assert_eq!(edn, expected);
}

Parse an EDN String with Edn::from_str:

use edn_rs::{
    set, map,
    Edn, Map, Vector, Set,
};
use std::str::FromStr;

fn main() -> Result<(), String> {
    let edn_str = "{:a \"2\" :b [true false] :c #{:A {:a :b} nil}}";
    // std::str::FromStr
    let edn: Edn = Edn::from_str(edn_str);

    assert_eq!(
        edn,
        Edn::Map(Map::new(
            map!{
                ":a".to_string() => Edn::Str("2".to_string()),
                ":b".to_string() => Edn::Vector(Vector::new(vec![Edn::Bool(true), Edn::Bool(false)])),
                ":c".to_string() => Edn::Set(Set::new(
                    set!{
                        Edn::Map(Map::new(map!{":a".to_string() => Edn::Key(":b".to_string())})),
                        Edn::Key(":A".to_string()),
                        Edn::Nil}))}
        ))
    );

    assert_eq!(edn[":b"][0], Edn::Bool(true));

    Ok(())
}

To navigate through Edn data you can just use get and get_mut:

use edn_rs::{
    edn,
    Edn, List, Map
};

fn main() {
    let edn = edn!((sym 1.2 3 {false :f nil 3/4}));

    println!("{:?}", edn);
    assert_eq!(edn[1], edn!(1.2));
    assert_eq!(edn[1], Edn::Double(1.2f64.into()));
    assert_eq!(edn[3]["false"], edn!(:f));
    assert_eq!(edn[3]["false"], Edn::Key(":f".to_string()));
}

Serializes Rust Types into EDN with ser_struct! or use edn-derive::Serialize

use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
use edn_rs::{
   ser_struct, map, set, hmap, hset
};

fn main() {
   ser_struct!{
       #[derive(Debug, Clone)]
       struct Edn {
           btreemap: BTreeMap<String, Vec<String>>,
           btreeset: BTreeSet<i64>,
           hashmap: HashMap<String, Vec<String>>,
           hashset: HashSet<i64>,
           tuples: (i32, bool, char),
           nothing: (),
       }
   };
   let edn = Edn {
       btreemap: map!{"this is a key".to_string() => vec!["with".to_string(), "many".to_string(), "keys".to_string()]},
       btreeset: set!{3i64, 4i64, 5i64},
       hashmap: hmap!{"this is a key".to_string() => vec!["with".to_string(), "many".to_string(), "keys".to_string()]},
       hashset: hset!{3i64},
       tuples: (3i32, true, 'd'),
       nothing: (),
   };

   println!("{}", edn_rs::to_string(edn));
   // { :btreemap {:this-is-a-key [\"with\", \"many\", \"keys\"]}, :btreeset #{3, 4, 5}, :hashmap {:this-is-a-key [\"with\", \"many\", \"keys\"]}, :hashset #{3}, :tuples (3, true, \\d), :nothing nil, }
}

Deserializes Strings into Rust Types:

For now you have to implement the conversion yourself with the Deserialize trait. Soon you'll be able to have that implemented for you via edn-derive crate.

use edn_rs::{Deserialize, Edn, EdnError};

#[derive(Debug, PartialEq)]
struct Person {
   name: String,
   age: usize,
}

impl Deserialize for Person {
   fn deserialize(edn: &Edn) -> Result<Self, EdnError> {
       Ok(Self {
           name: edn_rs::from_edn(&edn[":name"])?,
           age: edn_rs::from_edn(&edn[":age"])?,
       })
   }
}

fn main() -> Result<(), EdnError> {
   let edn_str = "{:name \"rose\" :age 66}";
   let person: Person = edn_rs::from_str(edn_str)?;

   assert_eq!(
       person,
       Person {
           name: "rose".to_string(),
           age: 66,
       }
   );

   println!("{:?}", person);
   // Person { name: "rose", age: 66 }

   let bad_edn_str = "{:name \"rose\" :age \"some text\"}";
   let person: Result<Person, EdnError> = edn_rs::from_str(bad_edn_str);

   assert_eq!(
       person,
       Err(EdnError::Deserialize(
           "couldn't convert `some text` into `uint`".to_string()
       ))
   );

   Ok(())
}

Deserializes Edn types into Rust Types:

For now you have to implement the conversion yourself with the Deserialize trait. Soon you'll be able to have that implemented for you via edn-derive crate.

use edn_rs::{map, Deserialize, Edn, EdnError, Map};

#[derive(Debug, PartialEq)]
struct Person {
   name: String,
   age: usize,
}

impl Deserialize for Person {
   fn deserialize(edn: &Edn) -> Result<Self, EdnError> {
       Ok(Self {
           name: edn_rs::from_edn(&edn[":name"])?,
           age: edn_rs::from_edn(&edn[":age"])?,
       })
   }
}

fn main() -> Result<(), EdnError> {
   let edn = Edn::Map(Map::new(map! {
       ":name".to_string() => Edn::Str("rose".to_string()),
       ":age".to_string() => Edn::UInt(66)
   }));
   let person: Person = edn_rs::from_edn(&edn)?;

   println!("{:?}", person);
   // Person { name: "rose", age: 66 }

   assert_eq!(
       person,
       Person {
           name: "rose".to_string(),
           age: 66,
       }
   );

   let bad_edn = Edn::Map(Map::new(map! {
       ":name".to_string() => Edn::Str("rose".to_string()),
       ":age".to_string() => Edn::Str("some text".to_string())
   }));
   let person: Result<Person, EdnError> = edn_rs::from_edn(&bad_edn);

   assert_eq!(
       person,
       Err(EdnError::Deserialize(
           "couldn't convert `\"some text\"` into `uint`".to_string()
       ))
   );

   Ok(())
}

Emits EDN format from a Json:

• This function requires feature json to be activated. To enable this feature add to your Cargo.toml dependencies the following line edn-rs = { version = 0.16.2", features = ["json"] }.

use edn_rs::json_to_edn;

fn main() {
   let json = String::from(r#"{"hello": "world"}"#);
   let edn = String::from(r#"{:hello "world"}"#);

   println!("{:?}", json_to_edn(json.clone()));
   assert_eq!(edn, json_to_edn(json));

   let complex_json = String::from(r#"{
           "people": 
           [
               {
                   "name": "otavio",
                   "age": 22
               },
               {
                   "name": "Julia",
                   "age": 32.0
               }
           ],
           "country or origin": "Brazil",
           "queerentener": true,
           "brain": null
       }"#);

   println!("{:?}", json_to_edn(complex_json.clone()).replace("  ", "").replace("\n", " "));
   // "{ :people  [ { :name \"otavio\", :age 22 }, { :name \"Julia\", :age 32.0 } ], :country-or-origin \"Brazil\", :queerentener true, :brain nil }"
}

to_string/to_debug

to_debug emits a Debug version of Edn type.

use edn_rs::edn::{Edn, Vector};

let edn = Edn::Vector(Vector::new(vec![Edn::Int(5), Edn::Int(6), Edn::Int(7)]));
let expected = "Vector(Vector([Int(5), Int(6), Int(7)]))";

assert_eq!(edn.to_debug(), expected);

to_string emits a valid edn.

use edn_rs::edn::{Edn, Vector};

let edn = Edn::Vector(Vector::new(vec![Edn::Int(5), Edn::Int(6), Edn::Int(7)]));
let expected = "[5, 6, 7, ]";

assert_eq!(edn.to_string(), expected);

Larger to_string example:

fn complex_ok() -> Result<(), EdnError> {
    use std::str::FromStr;
    let edn_str = "{ :list [{:name \"rose\" :age 66 :cool true}, {:name \"josh\" :age 33 :cool false}, {:name \"eva\" :age 296 :cool true}] }";

    let edn = Edn::from_str(edn_str)?;
    println!("{:?}", edn.to_string());
//    "{:list: [{:age 66, :cool true, :name \"rose\", }, {:age 33, :cool false, :name \"josh\", }, {:age 296, :cool true, :name \"eva\", }, ], }"

    Ok(())
}

Using async/await with Edn type

Edn supports futures by using the feature async. To enable this feature add to your Cargo.toml dependencies the following line edn-rs = { version = 0.16.2", features = ["async"] } and you can use futures as in the following example.

use edn_rs::{edn, Double, Edn, Vector};
use futures::prelude::*;
use futures::Future;
use tokio::prelude::*;

async fn foo() -> impl Future<Output = Edn> + Send {
    edn!([1 1.5 "hello" :key])
}

#[tokio::main]
async fn main() {
    let edn = foo().await.await;

    println!("{}", edn.to_string());
    assert_eq!(edn, edn!([1 1.5 "hello" :key]));

    assert_eq!(edn[1].to_float(), Some(1.5f64));
}

The objective of foo is to show that Edn can be wrapped with a Future. If you want to return an Edn from an async function just use:

async fn foo() -> Edn {
    edn!([1 1.5 "hello" :key])
}

Edn-rs Current Features

• Define struct to map EDN info EdnNode
• Define EDN types, EdnType
  • Edn Type into primitive: Edn::Bool(true).into() -> true. This was done by to_float, to_bool, to_int, to_vec.
  • implement futures::Future trait to Edn
  • to_string() for Edn.
  • to_debug() for Edn.
• Parse EDN data from_str:
  • nil ""
  • String "\"string\""
  • Numbers "324352", "3442.234", "3/4"
  • Keywords :a
  • Symbol sym-bol-s
  • Vector "[1 :2 \"d\"]"
  • List "(1 :2 \"d\")"
  • Set "#{1 2 3}"
  • Map "{:a 1 :b 2 }"
  • Inst #inst \"yyyy-mm-ddTHH:MM:ss\"
  • Nested structures "{:a \"2\" :b [true false] :c #{:A {:a :b} nil}}"
• Simple data structures in one another edn!:
  • Vec in Vec "[1 2 [:3 \"4\"]]"
  • Set in Vec "[1 2 #{:3 \"4\"}]"
  • List in List "(1 2 (:3 \"4\"))"
  • List in Set "'#{1 2 (:3 \"4\")}"
  • Maps in general "{:a 2 :b {:3 \"4\"}}", "{:a 2 :b [:3 \"4\"]}"
• Multiple simple data structures in one another (Map and Set in a vector)
• Multi deepen data structures (Map in a Set in a List in a Vec in a Vec)
• Navigate through Edn Data
  • Navigate through Sets. DOne by set_iter
• Json to Edn
  • Json String to EDN String
  • macro to process Structs and Enums to EDN
• trait Deserialize EDN to Struct
• trait Serialize struct to EDN

edn-derive

edn-derive is a proc-macro crate to (De)serialize Edn values, currently it is pre-alpha and it can be found at crates.io or at github.

Usage

Just add to your Cargo.toml the following:

[dependencies]
edn-derive = "<version>"
edn-rs = "0.16.2"

Examples

Serialize

use edn_derive::Serialize;

#[derive(Serialize)]
pub struct Person {
    name: String,
    age: usize,
}

fn main() {
    let person = Person {
        name: "joana".to_string(),
        age: 290000,
    };
    assert_eq!(
        edn_rs::to_string(person),
        "{ :name \"joana\", :age 290000, }"
    );
}

Deserialization

use edn_derive::Deserialize;
use edn_rs::EdnError;

// The `Debug` and `PartialEq` are only necessary because of `assert_eq`, you don't need them
#[derive(Deserialize, Debug, PartialEq)]
pub struct Person {
    name: String,
    age: usize,
}

fn main() -> Result<(), EdnError> {
    let edn_person = "{ :name \"joana\", :age 290000, }";

    let person: Person = edn_rs::from_str(edn_person)?;

    assert_eq!(
        person,
        Person {
            name: "joana".to_string(),
            age: 290000,
        }
    );

    Ok(())
}

Current Features

• derive Serialize
• edn_rs::to_string
• derive Deserialize
• let val: YourStruct = edn_rs::from_str(&str)