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use std::fmt::Display;
use crate::parse::Error;
/// A list of parsers that parsing can fail on. This is used for pretty-printing errors
#[derive(PartialEq, Debug, Clone, Copy)]
pub(crate) enum ParseNode {
SectionHeader,
Name,
Value,
}
impl Display for ParseNode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::SectionHeader => write!(f, "section header"),
Self::Name => write!(f, "name"),
Self::Value => write!(f, "value"),
}
}
}
impl Error {
/// The one-indexed line number where the error occurred. This is determined
/// by the number of newlines that were successfully parsed.
#[must_use]
pub const fn line_number(&self) -> usize {
self.line_number + 1
}
/// The data that was left unparsed, which contains the cause of the parse error.
#[must_use]
pub fn remaining_data(&self) -> &[u8] {
&self.parsed_until
}
}
impl Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"Got an unexpected token on line {} while trying to parse a {}: ",
self.line_number + 1,
self.last_attempted_parser,
)?;
let data_size = self.parsed_until.len();
let data = std::str::from_utf8(&self.parsed_until);
match (data, data_size) {
(Ok(data), _) if data_size > 10 => {
write!(
f,
"'{}' ... ({} characters omitted)",
&data.chars().take(10).collect::<String>(),
data_size - 10
)
}
(Ok(data), _) => write!(f, "'{data}'"),
(Err(_), _) => self.parsed_until.fmt(f),
}
}
}
impl std::error::Error for Error {}
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