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Improve WidthDb documentation

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This commit is contained in:
Joscha 2023-02-17 13:35:18 +01:00
parent 2dee39c03c
commit e3365fdc02
1 changed files with 12 additions and 4 deletions
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16
src/widthdb.rs
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@ -40,8 +40,8 @@ impl WidthDb {
///
/// If the grapheme is a tab, the column is used to determine its width.
///
/// If the width has not been measured yet, it is estimated using the
/// Unicode Standard Annex #11.
/// If the width has not been measured yet or measurements are turned off,
/// it is estimated using the Unicode Standard Annex #11.
pub fn grapheme_width(&mut self, grapheme: &str, col: usize) -> u8 {
assert_eq!(Some(grapheme), grapheme.graphemes(true).next());
if grapheme == "\t" {
@ -62,8 +62,8 @@ impl WidthDb {
///
/// If a grapheme is a tab, its column is used to determine its width.
///
/// If the width of a grapheme has not been measured yet, it is estimated
/// using the Unicode Standard Annex #11.
/// If the width of a grapheme has not been measured yet or measurements are
/// turned off, it is estimated using the Unicode Standard Annex #11.
pub fn width(&mut self, s: &str) -> usize {
let mut total: usize = 0;
for grapheme in s.graphemes(true) {
@ -72,6 +72,14 @@ impl WidthDb {
total
}
/// Perform primitive word wrapping with the specified maximum width.
///
/// Returns the byte offsets at which the string should be split into lines.
/// An offset of 1 would mean the first line contains only a single byte.
/// These offsets lie on grapheme boundaries.
///
/// This function does not support bidirectional script. It assumes the
/// entire text has the same direction.
pub fn wrap(&mut self, text: &str, width: usize) -> Vec<usize> {
wrap::wrap(self, text, width)
}