gix_config/parse/
error.rs

1use std::fmt::Display;
2
3use crate::parse::Error;
4
5/// A list of parsers that parsing can fail on. This is used for pretty-printing errors
6#[derive(PartialEq, Debug, Clone, Copy)]
7pub(crate) enum ParseNode {
8    SectionHeader,
9    Name,
10    Value,
11}
12
13impl Display for ParseNode {
14    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
15        match self {
16            Self::SectionHeader => write!(f, "section header"),
17            Self::Name => write!(f, "name"),
18            Self::Value => write!(f, "value"),
19        }
20    }
21}
22
23impl Error {
24    /// The one-indexed line number where the error occurred. This is determined
25    /// by the number of newlines that were successfully parsed.
26    #[must_use]
27    pub const fn line_number(&self) -> usize {
28        self.line_number + 1
29    }
30
31    /// The data that was left unparsed, which contains the cause of the parse error.
32    #[must_use]
33    pub fn remaining_data(&self) -> &[u8] {
34        &self.parsed_until
35    }
36}
37
38impl Display for Error {
39    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
40        write!(
41            f,
42            "Got an unexpected token on line {} while trying to parse a {}: ",
43            self.line_number + 1,
44            self.last_attempted_parser,
45        )?;
46
47        let data_size = self.parsed_until.len();
48        let data = std::str::from_utf8(&self.parsed_until);
49        match (data, data_size) {
50            (Ok(data), _) if data_size > 10 => {
51                write!(
52                    f,
53                    "'{}' ... ({} characters omitted)",
54                    &data.chars().take(10).collect::<String>(),
55                    data_size - 10
56                )
57            }
58            (Ok(data), _) => write!(f, "'{data}'"),
59            (Err(_), _) => self.parsed_until.fmt(f),
60        }
61    }
62}
63
64impl std::error::Error for Error {}
gix_config/parse/error.rs

gix_config/parse/
error.rs
