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serde-yaml

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Strongly typed YAML library for Rust

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Serde YAML
==========

[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/serde--yaml-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/serde-yaml)
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Rust library for using the [Serde] serialization framework with data in [YAML]
file format. _(This project is no longer maintained.)_

[Serde]: https://github.com/serde-rs/serde
[YAML]: https://yaml.org/

## Dependency

```toml
[dependencies]
serde = "1.0"
serde_yaml = "0.9"
```

Release notes are available under [GitHub releases].

[GitHub releases]: https://github.com/dtolnay/serde-yaml/releases

## Using Serde YAML

[API documentation is available in rustdoc form][docs.rs] but the general idea
is:

[docs.rs]: https://docs.rs/serde_yaml

```rust
use std::collections::BTreeMap;

fn main() -> Result<(), serde_yaml::Error> {
 // You have some type.
 let mut map = BTreeMap::new();
 map.insert("x".to_string(), 1.0);
 map.insert("y".to_string(), 2.0);

// Serialize it to a YAML string.
    let yaml = serde_yaml::to_string(&map)?;
    assert_eq!(yaml, "x: 1.0\ny: 2.0\n");

// Deserialize it back to a Rust type.
 let deserialized_map: BTreeMap<String, f64> = serde_yaml::from_str(&yaml)?;
 assert_eq!(map, deserialized_map);
 Ok(())
}
```

It can also be used with Serde's derive macros to handle structs and enums
defined in your program.

```toml
[dependencies]
serde = { version = "1.0", features = ["derive"] }
serde_yaml = "0.9"
```

Structs serialize in the obvious way:

```rust
use serde::{Serialize, Deserialize};

#[derive(Debug, PartialEq, Serialize, Deserialize)]
struct Point {
    x: f64,
    y: f64,
}

fn main() -> Result<(), serde_yaml::Error> {
 let point = Point { x: 1.0, y: 2.0 };

let yaml = serde_yaml::to_string(&point)?;
    assert_eq!(yaml, "x: 1.0\ny: 2.0\n");

let deserialized_point: Point = serde_yaml::from_str(&yaml)?;
    assert_eq!(point, deserialized_point);
    Ok(())
}
```

Enums serialize using YAML's `!tag` syntax to identify the variant name.

```rust
use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, PartialEq, Debug)]
enum Enum {
    Unit,
    Newtype(usize),
    Tuple(usize, usize, usize),
    Struct { x: f64, y: f64 },
}

fn main() -> Result<(), serde_yaml::Error> {
 let yaml = "
 - !Newtype 1
 - !Tuple [0, 0, 0]
 - !Struct {x: 1.0, y: 2.0}
 ";
 let values: Vec<Enum> = serde_yaml::from_str(yaml).unwrap();
 assert_eq!(values[0], Enum::Newtype(1));
 assert_eq!(values[1], Enum::Tuple(0, 0, 0));
 assert_eq!(values[2], Enum::Struct { x: 1.0, y: 2.0 });

// The last two in YAML's block style instead:
 let yaml = "
 - !Tuple
 - 0
 - 0
 - 0
 - !Struct
 x: 1.0
 y: 2.0
 ";
 let values: Vec<Enum> = serde_yaml::from_str(yaml).unwrap();
 assert_eq!(values[0], Enum::Tuple(0, 0, 0));
 assert_eq!(values[1], Enum::Struct { x: 1.0, y: 2.0 });

// Variants with no data can be written using !Tag or just the string name.
 let yaml = "
 - Unit # serialization produces this one
 - !Unit
 ";
 let values: Vec<Enum> = serde_yaml::from_str(yaml).unwrap();
 assert_eq!(values[0], Enum::Unit);
 assert_eq!(values[1], Enum::Unit);

Ok(())
}
```

#### License

Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.

serde-yaml

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