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-rw-r--r--src/tokenizer/error.rs78
1 files changed, 78 insertions, 0 deletions
diff --git a/src/tokenizer/error.rs b/src/tokenizer/error.rs
new file mode 100644
index 0000000..89eed2a
--- /dev/null
+++ b/src/tokenizer/error.rs
@@ -0,0 +1,78 @@
+//! 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,
+ 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")
+ }
+ CharRefError::InvalidNamedCharRef => {
+ write!(f, "invalid named character reference")
+ }
+ }
+ }
+}