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Fix highlight code splitting graphemes.

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This resulted in phantom blank lines in files with CRLF line
endings, but could potentially have manifested with other
graphemes as well.
This commit is contained in:
Nathan Vegdahl 2021-06-25 10:13:51 -07:00 committed by Blaž Hrastnik
parent eb6fb63e74
commit 2dba228c76
2 changed files with 29 additions and 3 deletions
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24
helix-core/src/graphemes.rs
View File

@ -121,6 +121,30 @@ pub fn next_grapheme_boundary(slice: RopeSlice, char_idx: usize) -> usize {
nth_next_grapheme_boundary(slice, char_idx, 1)
}
/// Returns the passed char index if it's already a grapheme boundary,
/// or the next grapheme boundary char index if not.
pub fn ensure_grapheme_boundary(slice: RopeSlice, char_idx: usize) -> usize {
if char_idx == 0 {
0
} else {
next_grapheme_boundary(slice, char_idx - 1)
}
}
/// Returns the passed byte index if it's already a grapheme boundary,
/// or the next grapheme boundary byte index if not.
pub fn ensure_grapheme_boundary_byte(slice: RopeSlice, byte_idx: usize) -> usize {
// TODO: we can avoid the byte/char conversions entirely
// if we also make byte versions of the other functions.
let char_idx = slice.byte_to_char(byte_idx);
let fixed_char_idx = ensure_grapheme_boundary(slice, char_idx);
if fixed_char_idx == char_idx {
byte_idx
} else {
slice.char_to_byte(fixed_char_idx)
}
}
/// Returns whether the given char position is a grapheme boundary.
pub fn is_grapheme_boundary(slice: RopeSlice, char_idx: usize) -> bool {
// Bounds check

8
helix-term/src/ui/editor.rs
View File

@ -8,6 +8,7 @@
use helix_core::{
coords_at_pos,
graphemes::{ensure_grapheme_boundary, ensure_grapheme_boundary_byte},
syntax::{self, HighlightEvent},
LineEnding, Position, Range,
};
@ -141,7 +142,8 @@ pub fn render_buffer(
'outer: for event in highlights {
match event.unwrap() {
HighlightEvent::HighlightStart(span) => {
HighlightEvent::HighlightStart(mut span) => {
span.0 = ensure_grapheme_boundary_byte(text, span.0);
spans.push(span);
}
HighlightEvent::HighlightEnd => {
@ -151,8 +153,8 @@ pub fn render_buffer(
// TODO: filter out spans out of viewport for now..
// TODO: do these before iterating
let start = text.byte_to_char(start);
let end = text.byte_to_char(end);
let start = ensure_grapheme_boundary(text, text.byte_to_char(start));
let end = ensure_grapheme_boundary(text, text.byte_to_char(end));
let text = text.slice(start..end);