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Merge #4325

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4325: Fix column conversion for supplementary plane characters r=matklad a=lnicola

Fixes https://github.com/rust-analyzer/rust-analyzer/pull/4276#issuecomment-623079855.

Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
This commit is contained in:
bors[bot] 2020-05-05 18:10:39 +00:00 committed by GitHub
commit a4778ddb7a
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1 changed files with 15 additions and 2 deletions
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17
crates/ra_ide_db/src/line_index.rs
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@ -31,9 +31,19 @@ pub(crate) struct Utf16Char {
}
impl Utf16Char {
/// Returns the length in 8-bit UTF-8 code units.
fn len(&self) -> TextSize {
self.end - self.start
}
/// Returns the length in 16-bit UTF-16 code units.
fn len_utf16(&self) -> usize {
if self.len() == TextSize::from(4) {
2
} else {
1
}
}
}
impl LineIndex {
@ -110,7 +120,7 @@ impl LineIndex {
if let Some(utf16_chars) = self.utf16_lines.get(&line) {
for c in utf16_chars {
if c.end <= col {
res -= usize::from(c.len()) - 1;
res -= usize::from(c.len()) - c.len_utf16();
} else {
// From here on, all utf16 characters come *after* the character we are mapping,
// so we don't need to take them into account
@ -125,7 +135,7 @@ impl LineIndex {
if let Some(utf16_chars) = self.utf16_lines.get(&line) {
for c in utf16_chars {
if col > u32::from(c.start) {
col += u32::from(c.len()) - 1;
col += u32::from(c.len()) - c.len_utf16() as u32;
} else {
// From here on, all utf16 characters come *after* the character we are mapping,
// so we don't need to take them into account
@ -204,6 +214,9 @@ const C: char = 'メ';
// UTF-16 to UTF-8
assert_eq!(col_index.utf16_to_utf8_col(1, 19), TextSize::from(21));
let col_index = LineIndex::new("a𐐏b");
assert_eq!(col_index.utf16_to_utf8_col(0, 3), TextSize::from(5));
}
#[test]