Byte-oriented line/column indexing helpers.

This crate has one responsibility: map byte offsets to (line, column) and back using cached line starts.

perl-line-index

A tiny microcrate that provides a byte-oriented line index used by incremental parsing paths.

API

• LineIndex::new(&str) builds a line-start cache.
• LineIndex::byte_to_position(usize) maps byte offset to (line, column).
• LineIndex::position_to_byte(line, column) maps back to byte offsets.
• LineIndex::position_to_byte_checked(line, column) returns None if the column crosses the addressed line's byte boundary.