Function codespan_reporting::files::column_index

pub fn column_index(
    source: &str,
    line_range: Range<usize>,
    byte_index: usize
) -> usize

The column index at the given byte index in the source file. This is the number of characters to the given byte index.

If the byte index is smaller than the start of the line, then 0 is returned. If the byte index is past the end of the line, the column index of the last character + 1 is returned.

Example

use codespan_reporting::files;

let source = "\n\n🗻∈🌏\n\n";

assert_eq!(files::column_index(source, 0..1, 0), 0);
assert_eq!(files::column_index(source, 2..13, 0), 0);
assert_eq!(files::column_index(source, 2..13, 2 + 0), 0);
assert_eq!(files::column_index(source, 2..13, 2 + 1), 0);
assert_eq!(files::column_index(source, 2..13, 2 + 4), 1);
assert_eq!(files::column_index(source, 2..13, 2 + 8), 2);
assert_eq!(files::column_index(source, 2..13, 2 + 10), 2);
assert_eq!(files::column_index(source, 2..13, 2 + 11), 3);
assert_eq!(files::column_index(source, 2..13, 2 + 12), 3);