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use quick_xml::events::{BytesEnd, BytesStart, BytesText, Event};
use quick_xml::{Reader, Writer};
use crate::error::{EncodingError, ParseError, Result};
pub(crate) trait ReaderExt {
fn expect_tag(&mut self, end: &[u8], buf: &mut Vec<u8>) -> Result<()>;
}
impl<B> ReaderExt for Reader<B>
where
B: std::io::BufRead,
{
fn expect_tag(&mut self, end: &[u8], buf: &mut Vec<u8>) -> Result<()> {
loop {
match self.read_event(buf) {
// TODO: this isn't exactly right, but it's good enough for now.
Ok(Event::Decl(ref _d)) => continue,
Ok(Event::Start(ref e)) => {
if e.name() != end {
return Err(ParseError::UnexpectedTag(
String::from_utf8_lossy(e.name()).into(),
String::from_utf8_lossy(end).into(),
)
.into());
}
break;
}
Ok(_e) => {
return Err(ParseError::UnexpectedEvent(
//e,
String::from_utf8_lossy(end).into(),
)
.into());
}
Err(e) => {
return Err(ParseError::UnexpectedError(
e.into(),
String::from_utf8_lossy(end).into(),
)
.into())
}
};
}
Ok(())
}
}
pub(crate) trait WriterExt {
// High level functions
fn write_tag(&mut self, tag: &[u8], text: &str) -> Result<()> {
self.write_start_tag(tag)?;
self.write_text(text)?;
self.write_end_tag(tag)?;
Ok(())
}
fn write_safe_tag(&mut self, tag: &[u8], text: &str) -> Result<()> {
self.write_start_tag(tag)?;
self.write_safe_text(text)?;
self.write_end_tag(tag)?;
Ok(())
}
// Building blocks
fn write_start_tag(&mut self, tag: &[u8]) -> Result<()>;
fn write_end_tag(&mut self, tag: &[u8]) -> Result<()>;
fn write_text(&mut self, text: &str) -> Result<()>;
fn write_safe_text(&mut self, text: &str) -> Result<()>;
}
impl<W> WriterExt for Writer<W>
where
W: std::io::Write,
{
fn write_start_tag(&mut self, tag: &[u8]) -> Result<()> {
self.write_event(Event::Start(BytesStart::borrowed_name(tag)))
.map_err(EncodingError::from)?;
Ok(())
}
fn write_end_tag(&mut self, tag: &[u8]) -> Result<()> {
self.write_event(Event::End(BytesEnd::borrowed(tag)))
.map_err(EncodingError::from)?;
Ok(())
}
fn write_text(&mut self, text: &str) -> Result<()> {
self.write_event(Event::Text(BytesText::from_plain_str(text)))
.map_err(EncodingError::from)?;
Ok(())
}
fn write_safe_text(&mut self, text: &str) -> Result<()> {
self.write_event(Event::Text(BytesText::from_escaped_str(text)))
.map_err(EncodingError::from)?;
Ok(())
}
}
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