Module change 

ChangeSet — the position-composable change representation (ADR-0006 §1).

A changeset is a complete traversal of a document: every character of the input is either retained or deleted, and new text is inserted between. That totality is what makes the two operations we actually care about possible — ChangeSet::compose (fold two changes into one) and ChangeSet::map_pos (where does this position end up?). The Phase-00 stub stored absolute from/to offsets, which cannot express either, which is why its rebase_onto was a hardcoded Err.

All lengths are char counts, matching ropey’s native indexing — never bytes, never graphemes (ADR-0006 §1).

Structs

ChangeSet

An ordered, position-composable set of changes.

ChangeSetBuilder

Builds a ChangeSet in canonical form.

ChangedSpan

The minimal span this change set replaces, in pre-image and post-image char offsets. None for an identity change set.

Enums

Assoc

Which side of an insertion a mapped position lands on (ADR-0006 §2).

Operation

One step of a document traversal.

RangeEffect

What an applied change did to a range something else was anchored to.