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use yaml_rust as yaml;
use source::Source;
use std::error::Error;
use std::fmt;
use std::collections::{BTreeMap, HashMap};
use std::mem;
use value::Value;
pub struct Content {
// Root table of the YAML document
root: yaml::Yaml,
}
impl Content {
pub fn parse(text: &str, namespace: Option<&String>) -> Result<Box<Source + Send + Sync>, Box<Error>> {
let mut docs = yaml::YamlLoader::load_from_str(text)?;
// Designate root
let mut root = match docs.len() {
0 => yaml::Yaml::Hash(BTreeMap::new()),
1 => mem::replace(&mut docs[0], yaml::Yaml::Null),
n => {
return Err(Box::new(MultipleDocumentsError(n)));
}
};
// Limit to namespace
if let Some(namespace) = namespace {
if let yaml::Yaml::Hash(mut root_map) = root {
if let Some(value) = root_map.remove(&yaml::Yaml::String(namespace.clone())) {
root = value;
} else {
// TODO: Warn?
root = yaml::Yaml::Hash(BTreeMap::new());
}
}
}
Ok(Box::new(Content { root: root }))
}
pub fn from_yaml(doc: yaml::Yaml) -> Content {
Content { root: doc }
}
}
fn from_yaml_value<'a>(value: &yaml::Yaml) -> Value {
match *value {
yaml::Yaml::String(ref value) => Value::String(value.clone()),
yaml::Yaml::Real(ref value) => Value::Float(value.parse::<f64>().unwrap()),
yaml::Yaml::Integer(value) => Value::Integer(value),
yaml::Yaml::Boolean(value) => Value::Boolean(value),
yaml::Yaml::Hash(ref table) => {
let mut m = HashMap::new();
for (key, value) in table {
if let Some(k) = key.as_str() {
m.insert(k.to_owned(), from_yaml_value(value));
}
// TODO: should we do anything for non-string keys?
}
Value::Table(m)
}
yaml::Yaml::Array(ref array) => {
let l: Vec<Value> = array.iter().map(from_yaml_value).collect();
Value::Array(l)
}
// TODO: how should we handle Null and BadValue?
_ => {
unimplemented!();
}
}
}
impl Source for Content {
fn collect(&self) -> HashMap<String, Value> {
if let Value::Table(table) = from_yaml_value(&self.root) {
table
} else {
// TODO: Better handle a non-object at root
// NOTE: I never want to support that but a panic is bad
panic!("expected object at YAML root");
}
}
}
#[derive(Debug, Copy, Clone)]
struct MultipleDocumentsError(usize);
impl fmt::Display for MultipleDocumentsError {
fn fmt(&self, format: &mut fmt::Formatter) -> fmt::Result {
write!(format, "Got {} YAML documents, expected 1", self.0)
}
}
impl Error for MultipleDocumentsError {
fn description(&self) -> &str {
"More than one YAML document provided"
}
}
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