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use std::error::Error;
use std::fmt;
use std::mem;
use yaml_rust as yaml;
use crate::format;
use crate::map::Map;
use crate::value::{Value, ValueKind};
pub fn parse(
uri: Option<&String>,
text: &str,
) -> Result<Map<String, Value>, Box<dyn Error + Send + Sync>> {
// Parse a YAML object from file
let mut docs = yaml::YamlLoader::load_from_str(text)?;
let root = match docs.len() {
0 => yaml::Yaml::Hash(yaml::yaml::Hash::new()),
1 => mem::replace(&mut docs[0], yaml::Yaml::Null),
n => {
return Err(Box::new(MultipleDocumentsError(n)));
}
};
let value = from_yaml_value(uri, &root)?;
format::extract_root_table(uri, value)
}
fn from_yaml_value(
uri: Option<&String>,
value: &yaml::Yaml,
) -> Result<Value, Box<dyn Error + Send + Sync>> {
match *value {
yaml::Yaml::String(ref value) => Ok(Value::new(uri, ValueKind::String(value.clone()))),
yaml::Yaml::Real(ref value) => {
// TODO: Figure out in what cases this can panic?
value
.parse::<f64>()
.map_err(|_| {
Box::new(FloatParsingError(value.to_string())) as Box<(dyn Error + Send + Sync)>
})
.map(ValueKind::Float)
.map(|f| Value::new(uri, f))
}
yaml::Yaml::Integer(value) => Ok(Value::new(uri, ValueKind::I64(value))),
yaml::Yaml::Boolean(value) => Ok(Value::new(uri, ValueKind::Boolean(value))),
yaml::Yaml::Hash(ref table) => {
let mut m = Map::new();
for (key, value) in table {
match key {
yaml::Yaml::String(k) => m.insert(k.to_owned(), from_yaml_value(uri, value)?),
yaml::Yaml::Integer(k) => m.insert(k.to_string(), from_yaml_value(uri, value)?),
_ => unreachable!(),
};
}
Ok(Value::new(uri, ValueKind::Table(m)))
}
yaml::Yaml::Array(ref array) => {
let mut l = Vec::new();
for value in array {
l.push(from_yaml_value(uri, value)?);
}
Ok(Value::new(uri, ValueKind::Array(l)))
}
// 1. Yaml NULL
// 2. BadValue – It shouldn't be possible to hit BadValue as this only happens when
// using the index trait badly or on a type error but we send back nil.
// 3. Alias – No idea what to do with this and there is a note in the lib that its
// not fully supported yet anyway
_ => Ok(Value::new(uri, ValueKind::Nil)),
}
}
#[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"
}
}
#[derive(Debug, Clone)]
struct FloatParsingError(String);
impl fmt::Display for FloatParsingError {
fn fmt(&self, format: &mut fmt::Formatter) -> fmt::Result {
write!(format, "Parsing {} as floating point number failed", self.0)
}
}
impl Error for FloatParsingError {
fn description(&self) -> &str {
"Floating point number parsing failed"
}
}
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