Elamur Groupantstreestore-dir
The groupant beside tools/treestore/src/dir.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 | Approximant |
| Ast | partial | syntax.json |
| Composition | partial | Composition |
| Cost | symbolic source derived | Invariant |
| Descriptant | present | Descriptant |
| Invariant | partial | Invariant |
| Tests | executed bounded checks | 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
A store directory: model.bin, .mts files and index.tsv (title, file stem, article number, sorted by the title's
bytes and searched in place), with get-by-title and sentence-by-number; also the readers of the sources (wikicorpus
shards listed by their .tsv, or a directory of per-article .zst records). Epoch 2026-11-06.
Approximant
get(title) = binary search of index.tsv (O(log size) seeks) → Shard (opened once, cached) → article. sentence(title, n) = get + store::sentences.
Invariant
index.tsv lists every article of every file exactly once, sorted by bytes; files are opened with the directory's model id.
Composition
Uses store::Shard and model::Model; used by main.rs.
Behavior complement
No title normalisation (exact bytes), no redirect resolution, no duplicate-title handling beyond returning the first match found by the search.
Reverse reconstruction
From the index row the file and position are recovered; from a title not in the index nothing.
Tests
Exercised by treestore get/sent/index on the tier-1 store (README measurements); the sorted search mirrors
wikicorpus's tested sorted_get.
Provenance
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/treestore/src/dir.rs.groupant/