Function find_word_at

src/text_input.rs:1788–1817

Find the word boundaries (start, end) at the given character position. Used for double-click word selection.

(text: &str, pos: usize)

/// Find the word boundaries (start, end) at the given character position.
/// Used for double-click word selection.
pub fn find_word_at(text: &str, pos: usize) -> (usize, usize) {
    let chars: Vec<char> = text.chars().collect();
    let len = chars.len();
    if len == 0 || pos >= len {
        return (pos, pos);
    }
    let is_word_char = |c: char| !c.is_whitespace();
    if !is_word_char(chars[pos]) {
        // On whitespace — select the whitespace run
        let mut start = pos;
        while start > 0 && !is_word_char(chars[start - 1]) {
            start -= 1;
        }
        let mut end = pos;
        while end < len && !is_word_char(chars[end]) {
            end += 1;
        }
        return (start, end);
    }
    // On a word char — find word boundaries
    let mut start = pos;
    while start > 0 && is_word_char(chars[start - 1]) {
        start -= 1;
    }
    let mut end = pos;
    while end < len && is_word_char(chars[end]) {
        end += 1;
    }
    (start, end)
}

/// Build the display text for rendering.
/// Returns the string that should be measured/drawn.