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pub mod private;
pub mod transform;
pub mod unicode;
pub use private::Private;
pub use transform::Transform;
pub use unicode::Unicode;
use std::iter::Peekable;
use crate::parser::ParserError;
#[derive(Debug, PartialEq, Eq, Clone, Hash, PartialOrd, Ord, Copy)]
pub enum ExtensionType {
Transform,
Unicode,
Private,
}
impl ExtensionType {
pub fn from_byte(key: u8) -> Result<Self, ParserError> {
let key = key.to_ascii_lowercase();
match key {
b'u' => Ok(Self::Unicode),
b't' => Ok(Self::Transform),
b'x' => Ok(Self::Private),
_ => Err(ParserError::InvalidExtension),
}
}
}
#[derive(Debug, Default, PartialEq, Eq, Clone, Hash, PartialOrd, Ord)]
pub struct Extensions {
pub unicode: Unicode,
pub transform: Transform,
pub private: Private,
}
impl Extensions {
pub fn is_empty(&self) -> bool {
self.unicode.is_empty() && self.transform.is_empty() && self.private.is_empty()
}
pub(crate) fn try_from_iter<'a>(
iter: &mut Peekable<impl Iterator<Item = &'a [u8]>>,
) -> Result<Self, ParserError> {
let mut unicode = None;
let mut transform = None;
let mut private = None;
let mut st = iter.next();
while let Some(subtag) = st {
match subtag.get(0).map(|b| ExtensionType::from_byte(*b)) {
Some(Ok(ExtensionType::Unicode)) => {
unicode = Some(Unicode::try_from_iter(iter)?);
}
Some(Ok(ExtensionType::Transform)) => {
transform = Some(Transform::try_from_iter(iter)?);
}
Some(Ok(ExtensionType::Private)) => {
private = Some(Private::try_from_iter(iter)?);
}
None => {}
_ => return Err(ParserError::InvalidExtension),
}
st = iter.next();
}
Ok(Self {
unicode: unicode.unwrap_or_default(),
transform: transform.unwrap_or_default(),
private: private.unwrap_or_default(),
})
}
}
impl std::fmt::Display for Extensions {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}{}{}", self.transform, self.unicode, self.private)?;
Ok(())
}
}