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use std::{error::Error, io::Error as IOError, str::Utf8Error, string::FromUtf8Error};
use xmlparser::Error as ParserError;
#[derive(Debug)]
pub enum XmlError {
IO(IOError),
Parser(ParserError),
Utf8(Utf8Error),
UnexpectedEof,
UnexpectedToken { token: String },
TagMismatch { expected: String, found: String },
MissingField { name: String, field: String },
UnterminatedEntity { entity: String },
UnrecognizedSymbol { symbol: String },
FromStr(Box<dyn Error + Send + Sync>),
}
impl From<IOError> for XmlError {
fn from(err: IOError) -> Self {
XmlError::IO(err)
}
}
impl From<Utf8Error> for XmlError {
fn from(err: Utf8Error) -> Self {
XmlError::Utf8(err)
}
}
impl From<FromUtf8Error> for XmlError {
fn from(err: FromUtf8Error) -> Self {
XmlError::Utf8(err.utf8_error())
}
}
impl From<ParserError> for XmlError {
fn from(err: ParserError) -> Self {
XmlError::Parser(err)
}
}
pub type XmlResult<T> = Result<T, XmlError>;
impl Error for XmlError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
use XmlError::*;
match self {
IO(e) => Some(e),
Parser(e) => Some(e),
Utf8(e) => Some(e),
FromStr(e) => Some(e.as_ref()),
_ => None,
}
}
}
impl std::fmt::Display for XmlError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use XmlError::*;
match self {
IO(e) => write!(f, "I/O error: {}", e),
Parser(e) => write!(f, "XML parser error: {}", e),
Utf8(e) => write!(f, "invalid UTF-8: {}", e),
UnexpectedEof => f.write_str("unexpected end of file"),
UnexpectedToken { token } => write!(f, "unexpected token in XML: {:?}", token),
TagMismatch { expected, found } => write!(
f,
"mismatched XML tag; expected {:?}, found {:?}",
expected, found
),
MissingField { name, field } => {
write!(f, "missing field in XML of {:?}: {:?}", name, field)
}
UnterminatedEntity { entity } => write!(f, "unterminated XML entity: {}", entity),
UnrecognizedSymbol { symbol } => write!(f, "unrecognized XML symbol: {}", symbol),
FromStr(e) => write!(f, "error parsing XML value: {}", e),
}
}
}