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|
use std::error::Error;
use std::ops::Deref;
use quick_xml::events::{BytesStart, Event};
pub mod buffer_deserializer;
pub trait Deserialize: Sized
{
type Error: Error + Send + Sync + 'static;
fn deserialize<TDeserializer: Deserializer>(
start: &BytesStart,
deserializer: &mut TDeserializer,
) -> Result<Self, Self::Error>;
}
pub trait Deserializer
{
fn de_tag<De: Deserialize>(
&mut self,
tag_name: &str,
ignore_end: IgnoreEnd,
) -> Result<De, DeserializerError>;
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>;
fn de_tag_list<De: Deserialize>(
&mut self,
tag_name: &str,
) -> Result<Vec<De>, DeserializerError>;
fn de_text(&mut self) -> Result<String, DeserializerError>;
fn skip_to_tag_start(&mut self, tag_name: &str) -> Result<(), DeserializerError>;
fn skip_to_tag_end(&mut self, tag_name: &str) -> Result<(), DeserializerError>;
}
pub enum IgnoreEnd
{
Yes,
No,
}
/// Function pointer type passable to [`Deserializer::de_tag_with`].
pub type DeserializeWithFn<Output, Err, Deserializer> =
fn(&BytesStart, &mut Deserializer) -> Result<Output, Err>;
#[derive(Debug, thiserror::Error)]
pub enum DeserializerError
{
#[error("Failed to read")]
ReadFailed(#[from] quick_xml::Error),
#[error("Failed to deserialize {0}")]
DeserializeFailed(&'static str, #[source] WrappedDeserializeError),
#[error("Expected {expected_event_name} event. Found {found_event:?}")]
UnexpectedEvent
{
expected_event_name: String,
found_event: Event<'static>,
},
#[error("Unexpected end of file")]
UnexpectedEndOfFile,
}
#[derive(Debug, thiserror::Error)]
#[error(transparent)]
pub struct WrappedDeserializeError(Box<dyn Error + Send + Sync>);
impl WrappedDeserializeError
{
fn new<Err: Error + Send + Sync + 'static>(err: Err) -> Self
{
Self(Box::new(err))
}
}
impl Deref for WrappedDeserializeError
{
type Target = dyn Error;
fn deref(&self) -> &Self::Target
{
self.0.as_ref()
}
}
pub trait ResultExt<Value>
{
fn try_event(self) -> Result<Option<Value>, DeserializerError>;
}
impl<Value> ResultExt<Value> for Result<Value, DeserializerError>
{
fn try_event(self) -> Result<Option<Value>, DeserializerError>
{
self.map_or_else(
|err| {
if let DeserializerError::UnexpectedEvent {
expected_event_name: _,
found_event: _,
} = err
{
return Ok(None);
}
Err(err)
},
|value| Ok(Some(value)),
)
}
}
|
