diff options
Diffstat (limited to 'helix-core/src/graphemes.rs')
| -rw-r--r-- | helix-core/src/graphemes.rs | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/helix-core/src/graphemes.rs b/helix-core/src/graphemes.rs index f71b6d5f..f7bf66c0 100644 --- a/helix-core/src/graphemes.rs +++ b/helix-core/src/graphemes.rs @@ -123,14 +123,24 @@ pub fn next_grapheme_boundary(slice: RopeSlice, char_idx: usize) -> usize { /// 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 { +pub fn ensure_grapheme_boundary_next(slice: RopeSlice, char_idx: usize) -> usize { if char_idx == 0 { - 0 + char_idx } else { next_grapheme_boundary(slice, char_idx - 1) } } +/// Returns the passed char index if it's already a grapheme boundary, +/// or the prev grapheme boundary char index if not. +pub fn ensure_grapheme_boundary_prev(slice: RopeSlice, char_idx: usize) -> usize { + if char_idx == slice.len_chars() { + char_idx + } else { + prev_grapheme_boundary(slice, char_idx + 1) + } +} + /// Returns whether the given char position is a grapheme boundary. pub fn is_grapheme_boundary(slice: RopeSlice, char_idx: usize) -> bool { // Bounds check |