// Copyright 2015, Yuheng Chen. See the LICENSE file at the top-level
// directory of this distribution.

//! YAML 1.2 implementation in pure Rust.
//!
//! # Usage
//!
//! This crate is [on github](https://github.com/chyh1990/yaml-rust) and can be
//! used by adding `yaml-rust` to the dependencies in your project's `Cargo.toml`.
//!
//! ```toml
//! [dependencies.yaml-rust]
//! git = "https://github.com/chyh1990/yaml-rust.git"
//! ```
//!
//! And this in your crate root:
//!
//! ```rust
//! extern crate yaml_rust;
//! ```
//!
//! Parse a string into `Vec<Yaml>` and then serialize it as a YAML string.
//!
//! # Examples
//!
//! ```
//! use yaml_rust::{YamlLoader, YamlEmitter};
//!
//! let docs = YamlLoader::load_from_str("[1, 2, 3]").unwrap();
//! let doc = &docs[0]; // select the first document
//! assert_eq!(doc[0].as_i64().unwrap(), 1); // access elements by index
//!
//! 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
//!
//! ```

#![cfg_attr(feature="clippy", feature(plugin))]
#![cfg_attr(feature="clippy", plugin(clippy))]
#![cfg_attr(feature="clippy", deny(clippy))]
#![cfg_attr(feature="clippy", warn(cyclomatic_complexity))]
#![cfg_attr(feature="clippy", allow(match_same_arms))]

#[cfg(feature = "preserve_order")]
extern crate linked_hash_map;

pub mod yaml;
pub mod scanner;
pub mod parser;
pub mod emitter;

// reexport key APIs
pub use scanner::ScanError;
pub use parser::Event;
pub use yaml::{Yaml, YamlLoader};
pub use emitter::{YamlEmitter, EmitError};

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_api() {
        let s =
"
# from yaml-cpp example
- name: Ogre
  position: [0, 5, 0]
  powers:
    - name: Club
      damage: 10
    - name: Fist
      damage: 8
- name: Dragon
  position: [1, 0, 10]
  powers:
    - name: Fire Breath
      damage: 25
    - name: Claws
      damage: 15
- name: Wizard
  position: [5, -3, 0]
  powers:
    - name: Acid Rain
      damage: 50
    - name: Staff
      damage: 3
";
        let docs = YamlLoader::load_from_str(s).unwrap();
        let doc = &docs[0];

        assert_eq!(doc[0]["name"].as_str().unwrap(), "Ogre");

        let mut writer = String::new();
        {
            let mut emitter = YamlEmitter::new(&mut writer);
            emitter.dump(doc).unwrap();
        }

        assert!(!writer.is_empty());
    }

    fn try_fail(s: &str) -> Result<Vec<Yaml>, ScanError> {
        let t = try!(YamlLoader::load_from_str(s));
        Ok(t)
    }

    #[test]
    fn test_fail() {
        let s =
"
# syntax error
scalar
key: [1, 2]]
key1:a2
";
        assert!(YamlLoader::load_from_str(s).is_err());
        assert!(try_fail(s).is_err());
    }

}
