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// use quick_xml::events::BytesDecl;
pub mod sasl;
pub mod stream;
// const DECLARATION: BytesDecl<'_> = BytesDecl::new("1.0", None, None);
use async_recursion::async_recursion;
use quick_xml::events::Event;
use quick_xml::{Reader, Writer};
use tokio::io::{AsyncBufRead, AsyncWrite};
use crate::JabberError;
#[derive(Clone, Debug)]
pub struct Element<'e> {
pub event: Event<'e>,
pub children: Option<Vec<Element<'e>>>,
}
impl<'e: 'async_recursion, 'async_recursion> Element<'e> {
pub fn write<'life0, W: AsyncWrite + Unpin + Send>(
&'async_recursion self,
writer: &'life0 mut Writer<W>,
) -> ::core::pin::Pin<
Box<
dyn ::core::future::Future<Output = Result<(), JabberError>>
+ 'async_recursion
+ ::core::marker::Send,
>,
>
where
W: 'async_recursion,
'life0: 'async_recursion,
{
Box::pin(async move {
match &self.event {
Event::Start(e) => {
writer.write_event_async(Event::Start(e.clone())).await?;
if let Some(children) = &self.children {
for e in children {
e.write(writer).await?;
}
}
writer.write_event_async(Event::End(e.to_end())).await?;
return Ok(());
}
e => Ok(writer.write_event_async(e).await?),
}
})
}
}
impl<'e> Element<'e> {
pub async fn write_start<W: AsyncWrite + Unpin + Send>(
&self,
writer: &mut Writer<W>,
) -> Result<(), JabberError> {
match self.event.as_ref() {
Event::Start(e) => Ok(writer.write_event_async(Event::Start(e.clone())).await?),
e => Err(ElementError::NotAStart(e.clone().into_owned()).into()),
}
}
pub async fn write_end<W: AsyncWrite + Unpin + Send>(
&self,
writer: &mut Writer<W>,
) -> Result<(), JabberError> {
match self.event.as_ref() {
Event::Start(e) => Ok(writer
.write_event_async(Event::End(e.clone().to_end()))
.await?),
e => Err(ElementError::NotAStart(e.clone().into_owned()).into()),
}
}
#[async_recursion]
pub async fn read<R: AsyncBufRead + Unpin + Send>(
reader: &mut Reader<R>,
) -> Result<Self, JabberError> {
let element = Self::read_recursive(reader)
.await?
.ok_or(JabberError::UnexpectedEnd);
element
}
#[async_recursion]
async fn read_recursive<R: AsyncBufRead + Unpin + Send>(
reader: &mut Reader<R>,
) -> Result<Option<Self>, JabberError> {
let mut buf = Vec::new();
let event = reader.read_event_into_async(&mut buf).await?;
match event {
Event::Start(e) => {
let mut children_vec = Vec::new();
while let Some(sub_element) = Element::read_recursive(reader).await? {
children_vec.push(sub_element)
}
let mut children = None;
if !children_vec.is_empty() {
children = Some(children_vec)
}
Ok(Some(Self {
event: Event::Start(e.into_owned()),
children,
}))
}
Event::End(_) => Ok(None),
e => Ok(Some(Self {
event: e.into_owned(),
children: None,
})),
}
}
#[async_recursion]
pub async fn read_start<R: AsyncBufRead + Unpin + Send>(
reader: &mut Reader<R>,
) -> Result<Self, JabberError> {
let mut buf = Vec::new();
let event = reader.read_event_into_async(&mut buf).await?;
match event {
Event::Start(e) => {
return Ok(Self {
event: Event::Start(e.into_owned()),
children: None,
})
}
e => Err(ElementError::NotAStart(e.into_owned()).into()),
}
}
}
/// if there is only one child in the vec of children, will return that element
pub fn child<'p, 'e>(element: &'p Element<'e>) -> Result<&'p Element<'e>, ElementError<'static>> {
if let Some(children) = &element.children {
if children.len() == 1 {
return Ok(&children[0]);
} else {
return Err(ElementError::MultipleChildren);
}
}
Err(ElementError::NoChildren)
}
/// returns reference to children
pub fn children<'p, 'e>(
element: &'p Element<'e>,
) -> Result<&'p Vec<Element<'e>>, ElementError<'e>> {
if let Some(children) = &element.children {
return Ok(children);
}
Err(ElementError::NoChildren)
}
#[derive(Debug)]
pub enum ElementError<'e> {
NotAStart(Event<'e>),
NoChildren,
MultipleChildren,
}
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