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|
use std::any::type_name;
use std::error::Error;
use std::io::BufRead;
use quick_xml::events::{BytesStart, Event};
use quick_xml::Reader;
use crate::deserialization::{
Deserialize,
Deserializer,
DeserializerError,
IgnoreEnd,
WrappedDeserializeError,
};
macro_rules! read_event {
($self: ident) => {{
let event = if let Some(leftover_event) = $self.leftover_event.take() {
leftover_event
} else {
$self.reader.read_event_into(&mut $self.buf)?.into_owned()
};
if let Event::Eof = &event {
return Err(DeserializerError::UnexpectedEndOfFile);
}
event
}};
}
pub struct BufferDeserializer<Source>
{
reader: Reader<Source>,
leftover_event: Option<Event<'static>>,
buf: Vec<u8>,
}
impl<Source> BufferDeserializer<Source>
where
Source: BufRead,
{
pub fn new(source: Source) -> Self
{
let mut reader = Reader::from_reader(source);
reader.trim_text(true);
reader.expand_empty_elements(true);
Self {
reader,
leftover_event: None,
buf: Vec::new(),
}
}
}
impl<Source> Deserializer for BufferDeserializer<Source>
where
Source: BufRead,
{
fn de_tag<De: Deserialize>(
&mut self,
tag_name: &str,
ignore_end: IgnoreEnd,
) -> Result<De, DeserializerError>
{
self.de_tag_with(tag_name, ignore_end, De::deserialize)
}
fn de_tag_with<Output, Err, DeserializeFn>(
&mut self,
tag_name: &str,
ignore_end: IgnoreEnd,
deserialize: DeserializeFn,
) -> Result<Output, DeserializerError>
where
Err: Error + Send + Sync + 'static,
DeserializeFn: FnOnce(&BytesStart, &mut Self) -> Result<Output, Err>,
{
let deserialized = match read_event!(self) {
Event::Start(start) if start.name().as_ref() == tag_name.as_bytes() => {
deserialize(&start, self).map_err(|err| {
DeserializerError::DeserializeFailed(
type_name::<Output>(),
WrappedDeserializeError::new(err),
)
})?
}
event => {
self.leftover_event = Some(event.clone().into_owned());
return Err(DeserializerError::UnexpectedEvent {
expected_event_name: format!("start({tag_name})"),
found_event: event,
});
}
};
if let IgnoreEnd::No = ignore_end {
self.read_end_event(tag_name)?;
}
Ok(deserialized)
}
fn de_tag_list<De: Deserialize>(
&mut self,
tag_name: &str,
) -> Result<Vec<De>, DeserializerError>
{
let mut deserialized_items = Vec::new();
loop {
let start = match read_event!(self) {
Event::Start(start) if start.name().as_ref() == tag_name.as_bytes() => {
start
}
Event::Comment(_) => {
continue;
}
event => {
self.leftover_event = Some(event.into_owned());
break;
}
};
let deserialized = De::deserialize(&start, self).map_err(|err| {
DeserializerError::DeserializeFailed(
type_name::<De>(),
WrappedDeserializeError::new(err),
)
})?;
self.read_end_event(tag_name)?;
deserialized_items.push(deserialized);
}
Ok(deserialized_items)
}
fn de_text(&mut self) -> Result<String, DeserializerError>
{
let text = match read_event!(self) {
Event::Text(text) => Ok(text),
event => {
self.leftover_event = Some(event.clone().into_owned());
Err(DeserializerError::UnexpectedEvent {
expected_event_name: "text".to_string(),
found_event: event,
})
}
}?
.unescape()?;
Ok(text.to_string())
}
fn skip_to_tag_start(&mut self, tag_name: &str) -> Result<(), DeserializerError>
{
loop {
match read_event!(self) {
Event::Start(start) if start.name().as_ref() == tag_name.as_bytes() => {
self.leftover_event = Some(Event::Start(start).into_owned());
break;
}
_ => {}
}
}
Ok(())
}
fn skip_to_tag_end(&mut self, tag_name: &str) -> Result<(), DeserializerError>
{
loop {
match read_event!(self) {
Event::End(end) if end.name().as_ref() == tag_name.as_bytes() => {
self.leftover_event = Some(Event::End(end).into_owned());
return Ok(());
}
_ => {}
}
}
}
}
impl<Source> BufferDeserializer<Source>
where
Source: BufRead,
{
fn read_end_event(&mut self, tag_name: &str) -> Result<(), DeserializerError>
{
let event = read_event!(self);
if matches!(&event, Event::End(end) if end.name().as_ref() == tag_name.as_bytes())
{
return Ok(());
}
Err(DeserializerError::UnexpectedEvent {
expected_event_name: "end".to_string(),
found_event: event.into_owned(),
})
}
}
|
