Function byte_offset_to_utf16_col

src/util.rs:402–411

Convert a byte offset within a single line to a UTF-16 column offset. This is the inverse of [`utf16_col_to_byte_offset`]. It counts UTF-16 code units for all characters before `byte_offset` and returns the result. Returns the total UTF-16 length of the line if `byte_offset` is past the end.

(line: &str, byte_offset: usize)

/// Returns the total UTF-16 length of the line if `byte_offset` is past
/// the end.
pub(crate) fn byte_offset_to_utf16_col(line: &str, byte_offset: usize) -> u32 {
    let mut col = 0u32;
    for (i, ch) in line.char_indices() {
        if i >= byte_offset {
            return col;
        }
        col += ch.len_utf16() as u32;
    }
    col
}

/// Extract the short (unqualified) class name from a potentially
/// fully-qualified name.