Module delta 

Delta operations: encoding, parsing, application, and diffing.

See docs/PROTOCOL.md § “Tree deltas”. Five operations:

Op	Wire
Add	+<ref>@<parent>[:<pos>] <role> <label> ...
Remove	-<ref>
Update	~<ref> <k>=<v> ...
Move	><ref>@<parent>[:<pos>]
Replace	*<ref> then indented subtree

The wire encoding is canonical (attributes sorted, ops in source order); the parser is tolerant.

Enums

DeltaOp

One delta operation.

Functions

apply

Apply ops to a clone of prev and return the resulting tree.

diff

Compute a delta that transforms a into b. apply(a, diff(a, b)) equals b (modulo position resolution; see the property tests).

encode

Encode a sequence of delta ops as the wire body.

parse

Parse a delta-op stream into a vector of ops.