Serde YAML ========== [github](https://github.com/dtolnay/serde-yaml) [crates.io](https://crates.io/crates/serde_yaml) [docs.rs](https://docs.rs/serde_yaml) [build status](https://github.com/dtolnay/serde-yaml/actions?query=branch%3Amaster) 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 _(This project is no longer maintained.)_ [Serde]: https://github.com/serde-rs/serde [YAML]: https://yaml.org/ ## Dependency ```toml [dependencies] serde = "1.0" serde_yaml = "0.9" ``` Release notes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 = 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 = 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 = 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 = serde_yaml::from_str(yaml).unwrap(); assert_eq!(values[0], Enum::Unit); assert_eq!(values[1], Enum::Unit); Ok(()) } ```
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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.