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#[cfg(test)]
mod tests;
use {
crate::{
from_bytes::FromBytes,
xkb::{
code::Code,
code_map::CodeMap,
code_slice::CodeSlice,
diagnostic::{DiagnosticKind, DiagnosticSink},
interner::{Interned, Interner},
span::{Span, SpanExt, SpanUnit, Spanned},
},
},
bstr::ByteSlice,
hashbrown::{HashMap, hash_map::Entry},
std::sync::Arc,
thiserror::Error,
};
#[derive(Default)]
pub(crate) struct StringCooker {
cache: HashMap<Interned, Interned>,
}
#[derive(Debug, Error, Eq, PartialEq)]
pub(crate) enum StringCookerError {
#[error("The octal literal overflows u8")]
OctalOverflow,
#[error("Unknown escape sequence {:?}", *.0 as char)]
UnknownSequence(u8),
#[error("Unterminated unicode escape sequence {:?}", .0.as_bstr())]
UnterminatedUnicodeEscape(CodeSlice<'static>),
#[error("Unicode escape sequence doesn't start with a `{{`")]
UnopenedUnicodeEscape,
#[error("Unicode escape sequence contains invalid representation {:?}", .0.as_bstr())]
InvalidUnicodeEscapeRepresentation(CodeSlice<'static>),
#[error("Code point is not valid: U+{:X}", .0)]
InvalidUnicodeCodepoint(u32),
}
impl StringCooker {
pub(crate) fn cook(
&mut self,
map: &mut CodeMap,
diagnostics: &mut DiagnosticSink,
interner: &mut Interner,
interned: Spanned<Interned>,
) -> Interned {
let string = interned.val;
let entry = match self.cache.entry(string) {
Entry::Occupied(e) => return *e.into_mut(),
Entry::Vacant(e) => e,
};
let uncooked = interner.get(string);
if !uncooked.contains(&b'\\') {
return *entry.insert(string);
}
let lo = interned.span.lo + 1;
let mut res = Vec::with_capacity(uncooked.len());
let mut i = 0;
'outer: while i < uncooked.len() {
let mut b = uncooked[i];
if b != b'\\' {
res.push(b);
i += 1;
continue;
}
i += 1;
b = uncooked[i];
i += 1;
let c = match b {
b'\\' => b'\\',
b'n' => b'\n',
b't' => b'\t',
b'r' => b'\r',
b'b' => b'\x08',
b'f' => b'\x0c',
b'v' => b'\x0b',
b'e' => b'\x1b',
b'"' => b'"',
b'0'..=b'7' => {
let start = i - 1;
let mut c = b as u32 - b'0' as u32;
macro_rules! next {
() => {
'next: {
if i < uncooked.len() {
b = uncooked[i];
if matches!(b, b'0'..=b'7') {
c = c << 3 | (b as u32 - b'0' as u32);
i += 1;
break 'next true;
}
}
false
}
};
}
let _ = next!() && next!();
if c > 0xff {
let span = Span {
lo: lo + start as SpanUnit,
hi: lo + i as SpanUnit,
};
diagnostics.push(
map,
DiagnosticKind::OctalStringEscapeOverflow,
StringCookerError::OctalOverflow.spanned2(span),
);
continue;
}
c as u8
}
b'u' => {
let start = i - 1;
loop {
if i == uncooked.len() {
let span = Span {
lo: lo + start as SpanUnit - 1,
hi: lo + i as SpanUnit,
};
diagnostics.push(
map,
DiagnosticKind::UnterminatedUnicodeEscape,
StringCookerError::UnterminatedUnicodeEscape(
uncooked.slice(start - 1..i).to_owned(),
)
.spanned2(span),
);
continue 'outer;
}
let b = uncooked[i];
i += 1;
if b == b'}' {
break;
}
}
if uncooked[start + 1] != b'{' {
let span = Span {
lo: lo + start as SpanUnit + 1,
hi: lo + start as SpanUnit + 2,
};
diagnostics.push(
map,
DiagnosticKind::UnopenedUnicodeEscape,
StringCookerError::UnopenedUnicodeEscape.spanned2(span),
);
continue;
}
let start = start + 2;
let end = i - 1;
let bytes = &uncooked[start..end];
let span = Span {
lo: lo + start as SpanUnit,
hi: lo + end as SpanUnit,
};
let Some(codepoint) = u32::from_bytes_hex(bytes) else {
diagnostics.push(
map,
DiagnosticKind::InvalidUnicodeEscapeRepresentation,
StringCookerError::InvalidUnicodeEscapeRepresentation(
uncooked.slice(start..end).to_owned(),
)
.spanned2(span),
);
continue;
};
let Some(codepoint) = char::from_u32(codepoint) else {
diagnostics.push(
map,
DiagnosticKind::InvalidUnicodeCodepoint,
StringCookerError::InvalidUnicodeCodepoint(codepoint).spanned2(span),
);
continue;
};
let mut buf = [0; 4];
res.extend_from_slice(codepoint.encode_utf8(&mut buf).as_bytes());
continue;
}
_ => {
let span = Span {
lo: lo + i as SpanUnit - 1,
hi: lo + i as SpanUnit,
};
diagnostics.push(
map,
DiagnosticKind::UnknownEscapeSequence,
StringCookerError::UnknownSequence(b).spanned2(span),
);
continue;
}
};
res.push(c);
}
let code = Code::new(&Arc::new(res));
let slice = CodeSlice::new_owned(&code, 0..code.len());
let interned = interner.intern(&slice);
entry.insert(interned);
interned
}
}