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improving parser error messages

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This commit is contained in:
mlokr 2024-09-18 09:47:52 +02:00
parent ece9bb8bf2
commit 98dfd6b09c
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GPG key ID: DEA147DDEE644993
3 changed files with 52 additions and 39 deletions
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2
hblang/README.md
View file

@ -241,7 +241,7 @@ main := fn(): int {
return @inline(foo.foo)
}
// in module: foo.hb
// in module: fooasd.hb
Type := struct {
brah: int,

8
hblang/src/lexer.rs
View file

@ -371,6 +371,10 @@ impl<'a> Lexer<'a> {
Self { pos, bytes: input.as_bytes() }
}
pub fn source(&self) -> &'a str {
unsafe { std::str::from_utf8_unchecked(self.bytes) }
}
pub fn slice(&self, tok: std::ops::Range<usize>) -> &'a str {
unsafe { std::str::from_utf8_unchecked(&self.bytes[tok]) }
}
@ -511,10 +515,6 @@ impl<'a> Lexer<'a> {
false
}
}
pub fn line_col(&self, pos: u32) -> (usize, usize) {
line_col(self.bytes, pos)
}
}
pub fn line_col(bytes: &[u8], pos: u32) -> (usize, usize) {

81
hblang/src/parser.rs
View file

@ -95,20 +95,20 @@ impl<'a, 'b> Parser<'a, 'b> {
let f = self.collect_list(TokenKind::Semi, TokenKind::Eof, |s| s.expr_low(true));
self.pop_scope(0);
let has_undeclared = !self.idents.is_empty();
let mut errors = String::new();
for id in self.idents.drain(..) {
let (line, col) = self.lexer.line_col(ident::pos(id.ident));
eprintln!(
"{}:{}:{} => undeclared identifier: {}",
report_to(
self.lexer.source(),
self.path,
line,
col,
self.lexer.slice(ident::range(id.ident))
id.ident,
format_args!("undeclared identifier: {}", self.lexer.slice(ident::range(id.ident))),
&mut errors,
);
}
if has_undeclared {
if !errors.is_empty() {
// TODO: we need error recovery
eprintln!("{errors}");
unreachable!();
}
@ -193,7 +193,7 @@ impl<'a, 'b> Parser<'a, 'b> {
self.declare_rec(value, top_level)
}
}
_ => self.report_pos(expr.pos(), "cant declare this shit (yet)"),
_ => self.report(expr.pos(), "cant declare this shit (yet)"),
}
}
@ -201,7 +201,7 @@ impl<'a, 'b> Parser<'a, 'b> {
if let Some(index) = index_to_check
&& index != 0
{
self.report_pos(
self.report(
pos,
format_args!(
"out of order declaration not allowed: {}",
@ -212,7 +212,7 @@ impl<'a, 'b> Parser<'a, 'b> {
let index = self.idents.binary_search_by_key(&id, |s| s.ident).expect("fck up");
if std::mem::replace(&mut self.idents[index].declared, true) {
self.report_pos(
self.report(
pos,
format_args!("redeclaration of identifier: {}", self.lexer.slice(ident::range(id))),
)
@ -276,7 +276,9 @@ impl<'a, 'b> Parser<'a, 'b> {
path: self.arena.alloc_str(path),
id: match (self.loader)(path, self.path) {
Ok(id) => id,
Err(e) => self.report(format_args!("error loading dependency: {e:#}")),
Err(e) => {
self.report(str.start, format_args!("error loading dependency: {e:#}"))
}
},
}
}
@ -408,7 +410,7 @@ impl<'a, 'b> Parser<'a, 'b> {
pos,
value: match u64::from_str_radix(slice, radix as u32) {
Ok(value) => value,
Err(e) => self.report(format_args!("invalid number: {e}")),
Err(e) => self.report(token.start, format_args!("invalid number: {e}")),
} as i64,
radix,
}
@ -419,7 +421,7 @@ impl<'a, 'b> Parser<'a, 'b> {
expr
}
T::Comment => Expr::Comment { pos, literal: self.move_str(token) },
tok => self.report(format_args!("unexpected token: {tok:?}")),
tok => self.report(token.start, format_args!("unexpected token: {tok:?}")),
};
loop {
@ -497,7 +499,10 @@ impl<'a, 'b> Parser<'a, 'b> {
if matches!(self.token.kind, TokenKind::Ident | TokenKind::CtIdent) {
self.next()
} else {
self.report(format_args!("expected identifier, found {:?}", self.token.kind))
self.report(
self.token.start,
format_args!("expected identifier, found {:?}", self.token.kind),
)
}
}
@ -552,20 +557,19 @@ impl<'a, 'b> Parser<'a, 'b> {
fn expect_advance(&mut self, kind: TokenKind) -> Token {
if self.token.kind != kind {
self.report(format_args!("expected {:?}, found {:?}", kind, self.token.kind));
self.report(
self.token.start,
format_args!("expected {:?}, found {:?}", kind, self.token.kind),
);
}
self.next()
}
#[track_caller]
fn report(&self, msg: impl fmt::Display) -> ! {
self.report_pos(self.token.start, msg)
}
#[track_caller]
fn report_pos(&self, pos: Pos, msg: impl fmt::Display) -> ! {
let (line, col) = self.lexer.line_col(pos);
eprintln!("{}:{}:{} => {}", self.path, line, col, msg);
fn report(&self, pos: Pos, msg: impl fmt::Display) -> ! {
let mut str = String::new();
report_to(self.lexer.source(), self.path, pos, msg, &mut str);
eprintln!("{str}");
unreachable!();
}
@ -1231,19 +1235,28 @@ impl AstInner<[Symbol]> {
}
pub fn report_to(&self, pos: Pos, msg: impl fmt::Display, out: &mut impl fmt::Write) {
let str = &self.file;
let (line, mut col) = lexer::line_col(str.as_bytes(), pos);
_ = writeln!(out, "{}:{}:{}: {}", self.path, line, col, msg);
let line = &str[str[..pos as usize].rfind('\n').map_or(0, |i| i + 1)
..str[pos as usize..].find('\n').unwrap_or(str.len()) + pos as usize];
col += line.matches('\t').count() * 3;
_ = writeln!(out, "{}", line.replace("\t", " "));
_ = writeln!(out, "{}^", " ".repeat(col - 1));
report_to(&self.file, &self.path, pos, msg, out);
}
}
pub fn report_to(
file: &str,
path: &str,
pos: Pos,
msg: impl fmt::Display,
out: &mut impl fmt::Write,
) {
let (line, mut col) = lexer::line_col(file.as_bytes(), pos);
_ = writeln!(out, "{}:{}:{}: {}", path, line, col, msg);
let line = &file[file[..pos as usize].rfind('\n').map_or(0, |i| i + 1)
..file[pos as usize..].find('\n').unwrap_or(file.len()) + pos as usize];
col += line.matches('\t').count() * 3;
_ = writeln!(out, "{}", line.replace("\t", " "));
_ = writeln!(out, "{}^", " ".repeat(col - 1));
}
#[derive(PartialEq, Eq, Hash)]
pub struct Ast(NonNull<AstInner<[Symbol]>>);