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use std::{
error, fmt,
num::{ParseFloatError, ParseIntError},
rc::Rc,
};
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Error {
// Number
InvalidFloatLiteral(Rc<str>, ParseFloatError),
InvalidIntegerLiteral(Rc<str>, ParseIntError),
// String
UnclosedString(Rc<str>),
UnexpectedEscapeChar(char),
// Par
UnexpectedRightPar,
UnclosedLeftPar,
UnexpectedEof,
RecursionLimit,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Error::InvalidFloatLiteral(number, err) => {
write!(f, "invalid float literal {number}: {err}")
}
Error::InvalidIntegerLiteral(number, err) => {
write!(f, "invalid integer literal {number}: {err}")
}
Error::UnclosedString(string) => write!(f, "unclosed string {string:?}"),
Error::UnexpectedEscapeChar(ch) => write!(f, "unexpected escape char {ch:?}"),
Error::UnexpectedRightPar => write!(f, "unexpected right par"),
Error::UnclosedLeftPar => write!(f, "unclosed left par"),
Error::UnexpectedEof => write!(f, "unexpected eof"),
Error::RecursionLimit => write!(f, "recursion limit"),
}
}
}
impl error::Error for Error {}
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