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//! Types to represent the parser errors that can occur.
use std::fmt::Display;
#[derive(PartialEq, Eq, Debug)]
#[non_exhaustive]
pub enum Error {
AttributesOnEndTag,
SelfClosingEndTag,
DuplicateAttribute,
BadCharacter(char),
UnexpectedCharacter(char, InternalState),
UnexpectedEOF(InternalState),
CharRef(CharRefError),
}
/// Allows Error variants to include the internal tokenizer state without making it public.
#[derive(PartialEq, Eq, Debug)]
pub struct InternalState(pub(crate) crate::tokenizer::states::State);
impl Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Error::AttributesOnEndTag => write!(f, "attributes on an end tag"),
Error::SelfClosingEndTag => write!(f, "self-closing end tag"),
Error::DuplicateAttribute => write!(f, "duplicate attribute"),
Error::BadCharacter(char) => write!(f, "bad character {:?}", char),
Error::UnexpectedCharacter(char, state) => {
write!(
f,
"unexpected character: saw {:?} in state {:?}",
char, state.0
)
}
Error::UnexpectedEOF(state) => write!(f, "unexpected EOF in state {:?}", state.0),
Error::CharRef(error) => error.fmt(f),
}
}
}
#[derive(PartialEq, Eq, Debug)]
#[non_exhaustive]
pub enum CharRefError {
MissingSemicolon,
NumericCharRefWithoutDigits,
NumericCharRefInvalid(u32),
EofInNumericCharRef,
EofAfterNumberSign,
EqualsSignAfterCharRefInAttr,
#[cfg(feature = "named-entities")]
#[cfg_attr(docsrs, doc(cfg(feature = "named-entities")))]
InvalidNamedCharRef,
}
impl Display for CharRefError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
CharRefError::NumericCharRefWithoutDigits => {
write!(f, "numeric character reference without digits")
}
CharRefError::MissingSemicolon => {
write!(f, "semicolon missing after character reference")
}
CharRefError::NumericCharRefInvalid(num) => {
write!(f, "invalid numeric character reference value 0x{:06X}", num)
}
CharRefError::EofInNumericCharRef => {
write!(f, "EOF in numeric character reference")
}
CharRefError::EofAfterNumberSign => {
write!(f, "EOF after '#' in character reference")
}
CharRefError::EqualsSignAfterCharRefInAttr => {
write!(f, "equals sign after character reference in attribute")
}
#[cfg(feature = "named-entities")]
CharRefError::InvalidNamedCharRef => {
write!(f, "invalid named character reference")
}
}
}
}
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