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diff --git a/third_party/rust/yaml-rust/README.md b/third_party/rust/yaml-rust/README.md new file mode 100644 index 0000000000..a31faf12e8 --- /dev/null +++ b/third_party/rust/yaml-rust/README.md @@ -0,0 +1,125 @@ +# yaml-rust + +The missing YAML 1.2 implementation for Rust. + +[](https://travis-ci.org/chyh1990/yaml-rust) +[](https://ci.appveyor.com/project/chyh1990/yaml-rust) +[](https://crates.io/crates/yaml-rust) +[](https://docs.rs/yaml-rust) + +`yaml-rust` is a pure Rust YAML 1.2 implementation, +which enjoys the memory safety +property and other benefits from the Rust language. +The parser is heavily influenced by `libyaml` and `yaml-cpp`. + +## Quick Start + +Add the following to the Cargo.toml of your project: + +```toml +[dependencies] +yaml-rust = "0.4" +``` + +and import: + +```rust +extern crate yaml_rust; +``` + +Use `yaml::YamlLoader` to load the YAML documents and access it +as Vec/HashMap: + +```rust +extern crate yaml_rust; +use yaml_rust::{YamlLoader, YamlEmitter}; + +fn main() { + let s = +" +foo: + - list1 + - list2 +bar: + - 1 + - 2.0 +"; + let docs = YamlLoader::load_from_str(s).unwrap(); + + // Multi document support, doc is a yaml::Yaml + let doc = &docs[0]; + + // Debug support + println!("{:?}", doc); + + // Index access for map & array + assert_eq!(doc["foo"][0].as_str().unwrap(), "list1"); + assert_eq!(doc["bar"][1].as_f64().unwrap(), 2.0); + + // Chained key/array access is checked and won't panic, + // return BadValue if they are not exist. + assert!(doc["INVALID_KEY"][100].is_badvalue()); + + // Dump the YAML object + let mut out_str = String::new(); + { + let mut emitter = YamlEmitter::new(&mut out_str); + emitter.dump(doc).unwrap(); // dump the YAML object to a String + } + println!("{}", out_str); +} +``` + +Note that `yaml_rust::Yaml` implements `Index<&'a str>` & `Index<usize>`: + +* `Index<usize>` assumes the container is an Array +* `Index<&'a str>` assumes the container is a string to value Map +* otherwise, `Yaml::BadValue` is returned + +If your document does not conform to this convention (e.g. map with +complex type key), you can use the `Yaml::as_XXX` family API to access your +documents. + +## Features + +* Pure Rust +* Ruby-like Array/Hash access API +* Low-level YAML events emission + +## Specification Compliance + +This implementation aims to provide YAML parser fully compatible with +the YAML 1.2 specification. The parser can correctly parse almost all +examples in the specification, except for the following known bugs: + +* Empty plain scalar in certain contexts + +However, the widely used library `libyaml` also fails to parse these examples, +so it may not be a huge problem for most users. + +## Goals + +* Encoder +* Tag directive +* Alias while deserialization + +## Minimum Rust version policy + +This crate's minimum supported `rustc` version is 1.31 (released with Rust 2018, after v0.4.3), as this is the currently known minimum version for [`regex`](https://crates.io/crates/regex#minimum-rust-version-policy) as well. + +## License + +Licensed under either of + + * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) + +at your option. + +## Contribution + +Fork & PR on Github. + +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any +additional terms or conditions. |