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Fix parse error returning the token after the error

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This commit is contained in:
Sofia 2025-07-17 20:16:37 +03:00
parent 6dfd98eba3
commit 0f782dcb96
4 changed files with 67 additions and 52 deletions
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13
reid/src/ast/parse.rs
View File

@ -128,7 +128,7 @@ impl Parse for PrimaryExpression {
stream.expect(Token::BracketClose)?;
Expression(Kind::Array(expressions), stream.get_range().unwrap())
}
_ => Err(stream.expected_err("identifier, constant, parentheses or brackets")?)?,
_ => Err(stream.expected_err("expression")?)?,
}
} else {
Err(stream.expected_err("expression")?)?
@ -391,7 +391,8 @@ impl Parse for Block {
// Special list of expressions that are simply not warned about,
// if semicolon is missing.
if !matches!(e, Expression(ExpressionKind::IfExpr(_), _)) {
println!("Oh no, does this statement lack ;");
// In theory could ignore the missing semicolon..
return Err(stream.expected_err("expected semicolon to complete statement")?);
}
statements.push(BlockLevelStatement::Expression(e));
@ -445,7 +446,7 @@ impl<T: Parse + std::fmt::Debug> Parse for NamedFieldList<T> {
stream.next();
} // Consume comma
Some(Token::BraceClose) => break,
Some(_) | None => Err(stream.expected_err("another field or closing brace")?)?,
Some(_) | None => Err(stream.expecting_err("another field or closing brace")?)?,
}
}
Ok(NamedFieldList(fields))
@ -478,7 +479,7 @@ impl Parse for ValueIndex {
match stream.peek() {
Some(Token::BracketOpen) => Ok(ValueIndex::Array(stream.parse()?)),
Some(Token::Dot) => Ok(ValueIndex::Struct(stream.parse()?)),
_ => Err(stream.expected_err("value or struct index")?),
_ => Err(stream.expecting_err("value or struct index")?),
}
}
}
@ -534,7 +535,7 @@ impl Parse for BlockLevelStatement {
Stmt::Return(ReturnType::Soft, e)
}
} else {
Err(stream.expected_err("expression")?)?
Err(stream.expecting_err("expression")?)?
}
}
}
@ -605,7 +606,7 @@ impl Parse for TopLevelStatement {
range,
})
}
_ => Err(stream.expected_err("import or fn")?)?,
_ => Err(stream.expecting_err("import or fn")?)?,
})
}
}

60
reid/src/error_raporting.rs
View File

@ -156,8 +156,8 @@ impl ReidError {
let pass_err = pass::Error {
metadata: Metadata {
source_module_id: module,
range: Default::default(),
position: error.get_position().copied(),
range: *error.get_range().unwrap_or(&Default::default()),
position: None,
},
kind: error,
};
@ -185,24 +185,16 @@ impl std::fmt::Display for ReidError {
for error in sorted_errors {
let meta = error.get_meta();
let module = self.map.get_module(&meta.source_module_id).unwrap();
let (position_fmt, line_fmt) = if let Some(tokens) = &module.tokens {
let position = if let Some(tokens) = &module.tokens {
let range_tokens = meta.range.into_tokens(&tokens);
let highlight_position = get_position(&range_tokens).unwrap();
let full_lines = get_full_lines(&tokens, highlight_position);
let lines_position = get_position(&full_lines).unwrap();
(
fmt_positions(highlight_position),
Some(fmt_lines(
module.source.as_ref().unwrap(),
lines_position,
highlight_position,
8,
)?),
)
dbg!(&error);
dbg!(&meta.range, &tokens[meta.range.start]);
get_position(&range_tokens).or(meta.position.map(|p| (p, p)))
} else if let Some(position) = meta.position {
(fmt_positions((position, position)), None)
Some((position, position))
} else {
("unknown".to_owned(), None)
None
};
if curr_module != Some(meta.source_module_id) {
@ -223,9 +215,16 @@ impl std::fmt::Display for ReidError {
writeln!(f)?;
write!(f, " Error: ")?;
writeln!(f, "{}", color_err(format!("{}", error))?)?;
write!(f, "{:>20}{}", color_warn("At: ")?, position_fmt)?;
if let Some(line_fmt) = line_fmt {
writeln!(f, "{}", line_fmt)?;
write!(
f,
"{:>20}{}",
color_warn("At: ")?,
position
.map(|p| fmt_positions(p))
.unwrap_or(String::from("{unknown}")),
)?;
if let (Some(position), Some(source)) = (position, &module.source) {
writeln!(f, "{}", fmt_lines(source, position, 6)?)?;
}
}
Ok(())
@ -238,7 +237,7 @@ impl TokenRange {
.iter()
.skip(self.start)
.by_ref()
.take(self.end - self.start)
.take(self.end + 1 - self.start)
.collect::<Vec<_>>()
}
}
@ -252,29 +251,16 @@ fn get_position(tokens: &Vec<&FullToken>) -> Option<(Position, Position)> {
}
}
fn get_full_lines<'v>(
tokens: &'v Vec<FullToken>,
(start, end): (Position, Position),
) -> Vec<&'v FullToken> {
let (first_token_pos, _) = tokens
.iter()
.enumerate()
.find(|(_, token)| token.position.1 == start.1)
.unwrap();
tokens
.iter()
.skip(first_token_pos)
.by_ref()
.take_while(|token| token.position.1 <= end.1)
.collect::<Vec<_>>()
fn into_full_lines<'v>((start, end): (Position, Position)) -> (Position, Position) {
(Position(0, start.1), Position(u32::MAX, end.1))
}
fn fmt_lines(
source: &String,
(line_start, line_end): (Position, Position),
(highlight_start, highlight_end): (Position, Position),
ident: usize,
) -> Result<String, std::fmt::Error> {
let (line_start, line_end) = into_full_lines((highlight_start, highlight_end));
let mut cursor = Cursor {
position: Position(0, 1),
char_stream: source.chars(),

44
reid/src/token_stream.rs
View File

@ -24,11 +24,31 @@ impl<'a, 'b> TokenStream<'a, 'b> {
}
}
/// Returns expected-error for the next token in-line. Useful in conjunction
/// with [`TokenStream::peek`]
pub fn expected_err<T: Into<String>>(&mut self, expected: T) -> Result<Error, Error> {
let next_token = self.previous().unwrap_or(Token::Eof);
Ok(Error::Expected(
expected.into(),
self.peek().unwrap_or(Token::Eof),
self.get_next_position()?,
next_token,
TokenRange {
start: self.position - 1,
end: self.position - 1,
},
))
}
/// Returns expected-error for the previous token that was already consumed.
/// Useful in conjunction with [`TokenStream::next`]
pub fn expecting_err<T: Into<String>>(&mut self, expected: T) -> Result<Error, Error> {
let next_token = self.peek().unwrap_or(Token::Eof);
Ok(Error::Expected(
expected.into(),
next_token,
TokenRange {
start: self.position,
end: self.position,
},
))
}
@ -38,10 +58,10 @@ impl<'a, 'b> TokenStream<'a, 'b> {
self.position += 1;
Ok(())
} else {
Err(self.expected_err(token)?)
Err(self.expecting_err(token)?)
}
} else {
Err(self.expected_err(token)?)
Err(self.expecting_err(token)?)
}
}
@ -55,6 +75,14 @@ impl<'a, 'b> TokenStream<'a, 'b> {
value
}
pub fn previous(&mut self) -> Option<Token> {
if (self.position as i32 - 1) < 0 {
None
} else {
Some(self.tokens[self.position - 1].token.clone())
}
}
pub fn peek(&mut self) -> Option<Token> {
if self.tokens.len() < self.position {
None
@ -147,11 +175,11 @@ impl<'a, 'b> TokenStream<'a, 'b> {
}
}
fn get_next_position(&self) -> Result<Position, Error> {
fn get_position(&self, offset: usize) -> Result<Position, Error> {
if self.tokens.is_empty() {
Err(Error::FileEmpty)
} else {
let token_idx = self.position.min(self.tokens.len() - 1);
let token_idx = (self.position - 1).min(self.tokens.len() - 1);
Ok(self.tokens[token_idx].position)
}
}
@ -210,7 +238,7 @@ impl std::iter::Sum for TokenRange {
#[derive(thiserror::Error, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum Error {
#[error("Expected {} got {:?}", .0, .1)]
Expected(String, Token, Position),
Expected(String, Token, TokenRange),
#[error("Source file contains no tokens")]
FileEmpty,
/// Only use this error in situations where the error never ends up for the end-user!
@ -222,7 +250,7 @@ pub enum Error {
}
impl Error {
pub fn get_position(&self) -> Option<&Position> {
pub fn get_range(&self) -> Option<&TokenRange> {
match self {
Error::Expected(_, _, pos) => Some(pos),
Error::FileEmpty => None,

2
reid_src/array_structs.reid
View File

@ -5,7 +5,7 @@ struct Test {
second: [u32; 4]
}
fn main() -> u32 {
fn main() -> v u32 {
let mut value = [Test {
field: 5,
second: [6, 3, "hello", 8],