lattice_text_core

Backend-agnostic grapheme and range helpers shared by lattice text CRDTs.

A text CRDT is a sequence CRDT of single-grapheme values plus a thin layer of grapheme/range bookkeeping: splitting inserted strings into graphemes, validating [start, end) ranges, slicing substrings, and folding multi-grapheme inserts and deletes into a single mergeable delta. That layer is identical regardless of which sequence CRDT stores the graphemes, so it lives here and is shared by lattice_text (backed by lattice_sequence) and lattice_text_fugue (backed by lattice_fugue).

This is an internal building block; most users want lattice_text or lattice_text_fugue directly.

Installation

gleam add lattice_text_core

What it provides

• RangeError / validate_range — validate 0 <= start <= end <= length.
• value — concatenate a grapheme list into a string.
• slice — extract the substring for a grapheme range.
• insert_graphemes / delete_graphemes — generic multi-grapheme fold helpers, parameterized over a backend's insert, delete, and merge functions, that thread a single merged delta across the whole edit.

License

MIT