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Fix indexing within lines in BidiInfo::visual_runs #278

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Fix indexing within lines in BidiInfo::visual_runs #278

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18 changes: 15 additions & 3 deletions unic/bidi/src/bidi_info.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -292,10 +292,12 @@ impl<'text> BidiInfo<'text> {
// Reset some whitespace chars to paragraph level.
// <https://www.unicode.org/reports/tr9/#L1>
let line_str: &str = &self.text[line.clone()];
let line_classes = &self.original_classes[line.clone()];
let line_levels = &mut levels[line.clone()];
let mut reset_from: Option<usize> = Some(0);
let mut reset_to: Option<usize> = None;
for (i, c) in line_str.char_indices() {
match self.original_classes[i] {
match line_classes[i] {
// Ignored by X9
RLE | LRE | RLO | LRO | PDF | BN => {}
// Segment separator, Paragraph separator
Expand All @@ -318,15 +320,15 @@ impl<'text> BidiInfo<'text> {
}
if let (Some(from), Some(to)) = (reset_from, reset_to) {
for j in from..to {
levels[j] = para.level;
line_levels[j] = para.level;
}
reset_from = None;
reset_to = None;
}
}
if let Some(from) = reset_from {
for j in from..line_str.len() {
levels[j] = para.level;
line_levels[j] = para.level;
}
}

Expand Down Expand Up @@ -751,6 +753,16 @@ mod tests {
"2 paragraphs with a maximum bidirectional level of 1"
);
}

#[test]
fn test_reordered_levels_line() {
let text = "aa טֶ";
let bidi_info = BidiInfo::new(text, None);
assert_eq!(
bidi_info.reordered_levels(&bidi_info.paragraphs[0], 3..7),
Level::vec(&[0, 0, 0, 1, 1, 1, 1]),
);
}
}

#[cfg(all(feature = "serde", test))]
Expand Down