Elamur Groupantsprag-rules-actions
The groupant beside prag/src/rules.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 source model | forward |
| ast | partial | ../syntax.json |
| composition | partial source model | composition |
| cost | partial source model | cost |
| descriptant | partial source model | epoch-memory |
| invariant | partial source model | invariant |
| tests | partial source model | checks |
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.
| id | type | label | where |
|---|---|---|---|
prag-rules-actions-behavior-complement | behavior_complement | partial source model | behavior-complement |
prag-rules-actions-reverse-reconstruction | reverse_reconstruction | partial source model | reverse-reconstruction |
prag-rules-actions-specialization | vacancy_transition | partial source model | specialization |
Model text
forward
PatientToTo exists iff patient=p is Some and recipient=None, then patient=None,recipient=p with remaining fields fixed. ToToPatient is symmetric. Oblique promotions consume first entry (first by for AgentFromBy) only if destination vacant. Swap exchanges unequal slots. KindEvent changes Say only; KindSay changes non-Bare unequal kinds. Links write frame coordinates, Resolve copies candidate with original pron, token actions append Event/predicate.
invariant
Promotion destinations are not overwritten. Surviving obliques retain order. AgentFromPatient intentionally overwrites agent. Drop is deferred. Not every action family is executed.
cost
Role moves O(1) except clones; oblique removal O(O) shifts; SaysRemove O(F+Q); ancestry adds bounded traversal. apply_at adds Read clone and frame index build.
behavior-complement
U=(patient,recipient,candidate outcome) over None,a,b. PatientToTo excludes success when recipient exists/patient absent, or resulting patient nonempty/recipient unequal to prior patient. For [(with,tool),(by,worker),(by,other)], AgentFromBy excludes choosing tool/other.
reverse-reconstruction
Successful PatientToTo is invertible when both slots/remainder observed: prior patient=result recipient, prior recipient=None. AgentNone loses alpha versus beta. Oblique promotion loses consumed preposition/position unless side information retained.
specialization
Nine patient/recipient states tested. Swap involution holds for successful unequal-slot domain; equal slots report no change. Compiled incorrect vacancy guard must fail the finite relation.
composition
Codec feeds selection without reordering. Sites and action-dependent atoms share the pre-rule Read; ordered action fold sees evolving state, then deletion remaps coordinates. Selection nested in codec retains status distinctions. Exact byte scopes constrain composition; no child alone proves the parent.
checks
Ten rules::wave15_models tests, tiny supplied fixtures only; two debug and two release passes with identical named outcomes. File-root receipts.md retains hashes. Finite catalogs, nine transfer states and sixteen deletion subsets; compiled production vacancy-guard mutant fails finite_transfer_and_drop_relations.
epoch-memory
2026-10-30: first rules tree. Review predicted unchanged valid-site transitions and O(1) validation before O(Read bytes) cloning. Old invalid_direct_sites_are_no_change failed because absent Drop returned Some; seven other initial tests passed. Repair rejects absent coordinates/unaligned reads. select_rules exposes the existing production filter; no selection policy change or speedup claimed.
limitations
Partial syntax, no expanded macros or semantic AST proof. No live parser, teacher, corpus, environment mutation, override or cache acquisition in tests. Empty verbs/entities avoid lexical matching acquisition; populated entity tests use direct actions. Token creation, full lexical/ancestry/action branches, IO/cache lifetime and all multi-site interactions remain unexecuted. Public atoms/drop_frames still require valid coordinates/alignment.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/prag/src/rules.rs.groupant/actions.groupant/