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use futures::Stream;
use nom::Err;
use std::str;
use tokio::io::AsyncBufReadExt;
use crate::{
element::{Element, Name, Namespace},
error::Error,
};
/// streaming reader that tracks depth and available namespaces at current depth
pub struct Reader<R> {
inner: R,
// holds which tags we are in atm over depth
depth: Vec<Name>,
namespaces: Vec<(usize, Namespace)>,
}
impl<R> Reader<R> {
pub fn new(reader: R) -> Self {
Self {
inner: reader,
depth: Vec::new(),
namespaces: Vec::new(),
}
}
}
impl<R> Reader<R>
where
R: AsyncBufReadExt + Unpin,
{
/// reads entire next prolog, element, or misc
pub async fn read<'s>(&'s mut self) -> Result<crate::xml::Element<'s>, Error> {
let element;
let len;
loop {
let buf = self.inner.fill_buf().await?;
let input = str::from_utf8(buf)?;
match crate::xml::element(input) {
Ok((rest, e)) => {
element = e;
len = buf.len() - rest.len();
break;
}
Err(e) => match e {
Err::Incomplete(_) => (),
e => return Err(Error::ParseError(input.to_owned())),
},
}
}
self.inner.consume(len);
// Ok(element)
todo!()
}
// pub async fn read_start(&self) -> Result<impl From<Element>, Error> {
// todo!()
// }
// pub async fn read_end(&self) -> Result<(), Error> {
// todo!()
// }
}
// impl<R: AsyncBufRead> Stream for Reader<R> {
// type Item = impl From<Element>;
// async fn poll_next(
// self: std::pin::Pin<&mut Self>,
// cx: &mut std::task::Context<'_>,
// ) -> std::task::Poll<Option<Self::Item>> {
// todo!()
// }
// }
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