Elamur Groupantsmova-elephant-key
The groupant beside tools/elephant/src/key.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| Approximant | partial | Forward approximant |
| Ast | partial | syntax.json |
| Composition | partial | Composition |
| Cost | partial | Cost |
| Descriptant | present | Descriptant |
| Invariant | partial | Invariant |
| Tests | finite evidence | Tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| relation | type | label | where |
|---|---|---|---|
| Behavior complement | behavior complement | partial source derived model | Behavior complement |
| Reverse reconstruction | reverse reconstruction | partial source derived model | Reverse reconstruction |
Model text
Descriptant
Compatibility of parts: the key that decides a part's records (format, rules version, hand-list fingerprint, models, language, dictionary), the change between two hand-list versions, and whether a part is affected by it. Source: tools/elephant/src/key.rs.
Forward approximant
Key::of(sidecar JSON, format, dict); list_change(old, new) -> compound_reading entries added and removed, other kinds counted as query-only; affected(part, sidecar, change): a removed entry with suppressed:<phrase> > 0 in the sidecar -> affected; an added entry (h, r, d) whose triple has a record in the part under any UPOS -> affected; else unaffected.
Invariant
affected = None implies the part's records are the same under the new lists: suppression acts only when the listed triple is emitted, and the role swaps it removes derive from that emission; other list kinds act at query time.
Cost
One scan of the part's records when compound entries were added; O(1) otherwise.
Composition
Parent: elephant. Used by store (admission) and reprogram (plan).
Behavior complement
Does not read text again; never attests a change of rules, model, format or language (those always recount). Evidence status: source-derived model with finite checks, not a proof.
Reverse reconstruction
With the list snapshots and both keys, a plan is recomputable; the attestation records keep the reason.
Tests
Checks
key::tests: keys from both sidecar versions, list changes in both directions, fingerprints; lsm reprogramming test: 3 of 4 parts attested, the part holding the new compound's edge recounted; red control: an entry on an edge every part holds attests none. These are finite fixtures and measurements; not a proof.
History
2026-11-06 · document
Epoch 2026-11-06
First model, written with the source (the Elephant made incremental and an animal on Mova).
Provenance
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/elephant/src/key.rs.groupant/