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use crate::scanner::ScannerError;
use std::fmt;
#[derive(Debug)]
pub enum ErrorKind {
UnexpectedChar(char),
UnterminatedString,
ExpectedToken(&'static str),
InternalError(&'static str),
TypeError(String),
VariableShadowed(String),
}
#[derive(Debug)]
pub struct Error {
pub kind: ErrorKind,
pub line: usize,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "[line NYI] Error: {:?}", self.kind)
}
}
impl From<ScannerError> for Error {
fn from(err: ScannerError) -> Self {
match err {
ScannerError::UnexpectedChar { line, unexpected } => Error {
line,
kind: ErrorKind::UnexpectedChar(unexpected),
},
ScannerError::UnterminatedString { line } => Error {
line,
kind: ErrorKind::UnterminatedString,
},
}
}
}
// Convenience implementation as we're often dealing with vectors of
// errors (to report as many issues as possible before terminating)
impl From<Error> for Vec<Error> {
fn from(err: Error) -> Self {
vec![err]
}
}
pub type LoxResult<T> = Result<T, Error>;
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