oxigraph/lib/oxrdfio/src/error.rs

use std::error::Error;
use std::{fmt, io};

/// Error returned during RDF format parsing.
#[derive(Debug)]
pub enum ParseError {
    /// I/O error during parsing (file not found...).
    Io(io::Error),
    /// An error in the file syntax.
    Syntax(SyntaxError),
}

impl ParseError {
    pub(crate) fn msg(msg: &'static str) -> Self {
        Self::Syntax(SyntaxError {
            inner: SyntaxErrorKind::Msg { msg },
        })
    }
}

impl fmt::Display for ParseError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Io(e) => e.fmt(f),
            Self::Syntax(e) => e.fmt(f),
        }
    }
}

impl Error for ParseError {
    #[inline]
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        match self {
            Self::Io(e) => Some(e),
            Self::Syntax(e) => Some(e),
        }
    }
}

impl From<oxttl::SyntaxError> for SyntaxError {
    #[inline]
    fn from(error: oxttl::SyntaxError) -> Self {
        SyntaxError {
            inner: SyntaxErrorKind::Turtle(error),
        }
    }
}

impl From<oxttl::ParseError> for ParseError {
    #[inline]
    fn from(error: oxttl::ParseError) -> Self {
        match error {
            oxttl::ParseError::Syntax(e) => Self::Syntax(e.into()),
            oxttl::ParseError::Io(e) => Self::Io(e),
        }
    }
}

impl From<oxrdfxml::SyntaxError> for SyntaxError {
    #[inline]
    fn from(error: oxrdfxml::SyntaxError) -> Self {
        SyntaxError {
            inner: SyntaxErrorKind::RdfXml(error),
        }
    }
}

impl From<oxrdfxml::ParseError> for ParseError {
    #[inline]
    fn from(error: oxrdfxml::ParseError) -> Self {
        match error {
            oxrdfxml::ParseError::Syntax(e) => Self::Syntax(e.into()),
            oxrdfxml::ParseError::Io(e) => Self::Io(e),
        }
    }
}

impl From<io::Error> for ParseError {
    #[inline]
    fn from(error: io::Error) -> Self {
        Self::Io(error)
    }
}

impl From<SyntaxError> for ParseError {
    #[inline]
    fn from(error: SyntaxError) -> Self {
        Self::Syntax(error)
    }
}

impl From<ParseError> for io::Error {
    #[inline]
    fn from(error: ParseError) -> Self {
        match error {
            ParseError::Io(error) => error,
            ParseError::Syntax(error) => error.into(),
        }
    }
}

/// An error in the syntax of the parsed file.
#[derive(Debug)]
pub struct SyntaxError {
    inner: SyntaxErrorKind,
}

#[derive(Debug)]
enum SyntaxErrorKind {
    Turtle(oxttl::SyntaxError),
    RdfXml(oxrdfxml::SyntaxError),

    Msg { msg: &'static str },
}

impl fmt::Display for SyntaxError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.inner {
            SyntaxErrorKind::Turtle(e) => e.fmt(f),
            SyntaxErrorKind::RdfXml(e) => e.fmt(f),
            SyntaxErrorKind::Msg { msg } => write!(f, "{msg}"),
        }
    }
}

impl Error for SyntaxError {
    #[inline]
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        match &self.inner {
            SyntaxErrorKind::Turtle(e) => Some(e),
            SyntaxErrorKind::RdfXml(e) => Some(e),
            SyntaxErrorKind::Msg { .. } => None,
        }
    }
}

impl From<SyntaxError> for io::Error {
    #[inline]
    fn from(error: SyntaxError) -> Self {
        match error.inner {
            SyntaxErrorKind::Turtle(error) => error.into(),
            SyntaxErrorKind::RdfXml(error) => error.into(),
            SyntaxErrorKind::Msg { msg } => io::Error::new(io::ErrorKind::InvalidData, msg),
        }
    }
}