Function hash_source_info

crates/common/src/env.rs:622–642

(si: &SourceInfo, hasher: &mut blake3::Hasher)

fn hash_substring(ss: &Substring, hasher: &mut blake3::Hasher) {
  hasher.update(&[MSSTR]);
  hasher.update(ss.str.as_bytes());
  hasher.update(&ss.start_pos.to_le_bytes());
  hasher.update(&ss.stop_pos.to_le_bytes());
}

/// Source location metadata attached to syntax nodes.
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub enum SourceInfo {
  /// Original source with leading whitespace, leading position, trailing whitespace, trailing position.
  Original(Substring, Nat, Substring, Nat),
  /// Synthetic source span with start position, stop position, and canonical flag.
  Synthetic(Nat, Nat, bool),
  /// No source information available.
  None,
}

fn hash_source_info(si: &SourceInfo, hasher: &mut blake3::Hasher) {
  hasher.update(&[MSINFO]);
  match si {
    SourceInfo::Original(leading, leading_pos, trailing, trailing_pos) => {
      hasher.update(&[0]);
      hash_substring(leading, hasher);
      hasher.update(&leading_pos.to_le_bytes());
      hash_substring(trailing, hasher);