51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
use super::{token::{FileRegion, TokenInstance}, FilePos};
|
|
|
|
#[derive(Debug)]
|
|
pub struct ParserError {
|
|
pub msg: String,
|
|
pub regions: Vec<FileRegion>,
|
|
}
|
|
|
|
impl ParserError {
|
|
pub fn from_instances(instances: &[&TokenInstance], msg: String) -> Self {
|
|
ParserError {
|
|
msg,
|
|
regions: instances.iter().map(|i| i.region).collect(),
|
|
}
|
|
}
|
|
pub fn from_msg(msg: String) -> Self {
|
|
Self {
|
|
msg,
|
|
regions: Vec::new(),
|
|
}
|
|
}
|
|
pub fn at(pos: FilePos, msg: String) -> Self {
|
|
Self {
|
|
msg,
|
|
regions: vec![FileRegion {
|
|
start: pos,
|
|
end: pos,
|
|
}],
|
|
}
|
|
}
|
|
pub fn unexpected_end() -> Self {
|
|
Self::from_msg("unexpected end of input".to_string())
|
|
}
|
|
pub fn unexpected_token(inst: &TokenInstance, expected: &str) -> Self {
|
|
let t = &inst.token;
|
|
ParserError::from_instances(
|
|
&[inst],
|
|
format!("Unexpected token {t:?}; expected {expected}"),
|
|
)
|
|
}
|
|
pub fn write_for(&self, writer: &mut impl std::io::Write, file: &str) -> std::io::Result<()> {
|
|
let after = if self.regions.is_empty() { "" } else { ":" };
|
|
writeln!(writer, "error: {}{}", self.msg, after)?;
|
|
for reg in &self.regions {
|
|
reg.write_for(writer, file)?;
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|