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use std::collections::BTreeMap;
use serde::de;
use serde::de::Error;
#[derive(Clone, PartialEq, Debug)]
pub struct Element {
pub attributes: BTreeMap<String, Vec<String>>,
pub members: Content,
}
impl Element {
pub fn new_text(s: String) -> Element {
Element {
attributes: BTreeMap::new(),
members: Content::Text(s),
}
}
pub fn new_empty() -> Element {
Element {
attributes: BTreeMap::new(),
members: Content::Nothing,
}
}
}
#[derive(Clone, PartialEq, Debug)]
pub enum Content {
Members(BTreeMap<String, Vec<Element>>),
Text(String),
Nothing,
}
impl de::Deserialize for Element {
fn deserialize<D>(deserializer: &mut D) -> Result<Element, D::Error>
where D: de::Deserializer,
{
deserializer.visit_map(ElementVisitor)
}
}
enum Helper {
Member(Element),
Text(String),
}
impl de::Deserialize for Helper {
fn deserialize<D>(deserializer: &mut D) -> Result<Helper, D::Error>
where D: de::Deserializer,
{
let el = try!(deserializer.visit_map(ElementVisitor));
Ok(match (el.attributes.is_empty(), el.members) {
(true, Content::Text(s)) => Helper::Text(s),
(_, c) => Helper::Member(Element {
attributes: el.attributes,
members: c
}),
})
}
}
struct ElementVisitor;
impl de::Visitor for ElementVisitor {
type Value = Element;
fn visit_str<E>(&mut self, s: &str) -> Result<Element, E>
where E: Error,
{
Ok(Element::new_text(s.to_string()))
}
fn visit_string<E>(&mut self, s: String) -> Result<Element, E>
where E: Error,
{
Ok(Element::new_text(s))
}
#[inline]
fn visit_map<V>(&mut self, mut visitor: V) -> Result<Element, V::Error>
where V: de::MapVisitor,
{
let mut attributes = BTreeMap::new();
let mut content = Content::Nothing;
while let Some(key) = try!(visitor.visit_key::<String>()) {
match content {
Content::Nothing if key == "$value" => {
let v = try!(visitor.visit_value());
content = Content::Text(v);
},
Content::Text(_)=> unreachable!(),
Content::Members(mut map) => {
map.entry(key)
.or_insert(vec![])
.push(try!(visitor.visit_value()));
content = Content::Members(map);
},
Content::Nothing => {
match try!(visitor.visit_value()) {
Helper::Member(el) => {
let mut m = BTreeMap::new();
m.insert(key, vec![el]);
content = Content::Members(m);
},
Helper::Text(s) => {
attributes.entry(key).or_insert(vec![]).push(s);
content = Content::Nothing;
}
}
},
}
}
try!(visitor.end());
Ok(Element {
attributes: attributes,
members: content,
})
}
}
pub fn from_value<T>(value: Element) -> Result<T, super::error::Error>
where T: de::Deserialize
{
let mut de = super::de::value::Deserializer::new(value);
de::Deserialize::deserialize(&mut de)
}