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Remove 0 TextSize at front

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This commit is contained in:
Ariel Davis 2023-05-06 01:46:33 -07:00
parent 6500487735
commit e8a93306f0
1 changed files with 11 additions and 8 deletions
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19
lib/line-index/src/lib.rs
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@ -83,7 +83,7 @@ impl WideChar {
/// Maps flat [`TextSize`] offsets to/from `(line, column)` representation.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct LineIndex {
/// Offset the beginning of each line, zero-based.
/// Offset the beginning of each line (except the first, which always has offset 0).
newlines: Box<[TextSize]>,
/// List of non-ASCII characters on each line.
line_wide_chars: IntMap<u32, Box<[WideChar]>>,
@ -100,8 +100,6 @@ impl LineIndex {
let mut cur_col = TextSize::from(0);
let mut line = 0;
newlines.push(TextSize::from(0));
for c in text.chars() {
let c_len = TextSize::of(c);
cur_row += c_len;
@ -147,8 +145,8 @@ impl LineIndex {
/// Transforms the `TextSize` into a `LineCol`, or returns `None` if the `offset` was invalid,
/// e.g. if it points to the middle of a multi-byte character.
pub fn try_line_col(&self, offset: TextSize) -> Option<LineCol> {
let line = self.newlines.partition_point(|&it| it <= offset).checked_sub(1)?;
let start = self.newlines.get(line)?;
let line = self.newlines.partition_point(|&it| it <= offset);
let start = self.start_offset(line)?;
let col = offset - start;
let ret = LineCol { line: line as u32, col: col.into() };
self.line_wide_chars
@ -162,9 +160,14 @@ impl LineIndex {
/// Transforms the `LineCol` into a `TextSize`.
pub fn offset(&self, line_col: LineCol) -> Option<TextSize> {
self.newlines
.get(line_col.line as usize)
.map(|offset| offset + TextSize::from(line_col.col))
self.start_offset(line_col.line as usize).map(|start| start + TextSize::from(line_col.col))
}
fn start_offset(&self, line: usize) -> Option<TextSize> {
match line.checked_sub(1) {
None => Some(TextSize::from(0)),
Some(it) => self.newlines.get(it).copied(),
}
}
/// Transforms the `LineCol` with the given `WideEncoding` into a `WideLineCol`.