---
title: "langseg-corpus-clean — Mova code model"
description: "Mova code model of tools/langseg/src/corpus.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/tools/langseg/src/corpus.rs.groupant/clean.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# langseg-corpus-clean

The groupant beside tools/langseg/src/corpus.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

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`tools/langseg/src/corpus.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/langseg/src/corpus.rs)
- **source SHA-256:** `ab5927cbc959808c…`
- **covers:** Tag-depth suppression/entity replacement then bracket closer lookahead then whitespace join. (bytes 2174–3471)
- **part of:** [langseg-corpus](https://md.groupants.elamur.ai/free/en/mova/tools/langseg/src/corpus.rs.groupant/)
- **repository folder:** [`tools/langseg/src/corpus.rs.groupant/clean.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/langseg/src/corpus.rs.groupant/clean.groupant)
- **repository commit:** `855da7bd4a7b`

> **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](#approximant) |
| **ast** | partial | `../syntax.json` |
| **cost** | symbolic source derived | [invariant](#invariant) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | executed bounded checks | [tests](#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.

| id | type | label | where |
|---|---|---|---|
| `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `tag_depth` | tag_depth | partial source derived model | [tag_depth](#tag-depth) |
| `closer_window` | closer_window | partial source derived model | [closer_window](#closer-window) |
| `entity_sequence` | entity_sequence | partial source derived model | [entity_sequence](#entity-sequence) |
| `whitespace_quotient` | whitespace_quotient | partial source derived model | [whitespace_quotient](#whitespace-quotient) |

## Model text


### descriptant

#### Descriptant

##### Prospective epoch

2026-10-31 source review predicted: Tag-depth suppression/entity replacement then bracket closer lookahead then whitespace join. Resource model: O(B) with60 lookahead cap; O(B) buffers. External prospective.md predates test additions and preserves APIs, effect order, hazards and interaction hypotheses.

##### Observed epoch

Bounded real helper checks in tests.md constrain these models; syntax is a partial lexical projection with no macro expansion, name resolution or proof. Production expressions unchanged; five inline test modules added. Compiled mutants are temporary and exactly restored. Existing malformed-input and nonfinite domains remain explicit, not silently repaired. Parent composes this scope with siblings without adding overlapping costs twice.

Exact byte scope; finite correspondence only. Untested branches source-derived.

### approximant

#### Forward relation

Tag-depth suppression/entity replacement then bracket closer lookahead then whitespace join.

Domain: Closer within60 chars triggers skip; nesting not balanced; unmatched tag suppresses tail.

### invariant

#### Invariant and cost

##### Invariant

Closer within60 chars triggers skip; nesting not balanced; unmatched tag suppresses tail.

##### Cost

O(B) with60 lookahead cap; O(B) buffers.

##### Limits

Exact byte scope; finite correspondence only. Untested branches source-derived. No percentage surrogate is implemented: categorical parsing/effect observations lack an admitted numerical error metric. Any future profile must define its metric/domain and use only1/2/5/10 percent caps.

### models

## Typed source-bound relations

Subject: exact source SHA-256 in manifest. Domain and resource premises are in invariant.md. Each model is partial, source-derived, over a single helper invocation or the described finite trace. Complements are proposed inner exclusions under those premises; reverse relations retain all compatible antecedents, with no unique inverse claim. The oracle is the named checks in tests.md; unexecuted cases remain hypotheses. No numerical approximation certificate.

### behavior_complement

Completed tag syntax absent, between-tag text retained; no far unmatched bracket removal.

### reverse_reconstruction

Preimage includes arbitrary erased tags/references and whitespace.

### tag_depth

< increments, > at positive depth decrements/inserts space; > outside copied.

### closer_window

take(60) includes opener; closer offset59 admitted,60 excluded.

### entity_sequence

Only nbsp/thinsp/amp recognized; no general decoder.

### whitespace_quotient

Split/join loses leading/trailing spaces and run widths.

### tests

#### Checks and evidence

Named source/helper checks: corpus::wave31::cleaning_chunk_and_split_boundaries.

Wave31 on2026-10-31:30 distinct exact tests passed twice debug and twice release, with equal sorted named outcomes. This node claims only its listed subset; empty subset means source review only. Six actual source-behavior mutants compiled, failed assertions, restored exact bytes/hash, and passed focused green reruns. No assertion-only mutants; existing swapped-input controls are separate. Receipt bundle: $MOVA_DATA/runs/octopus-wave31-corpus-2026-10-31 (native-commands.json, source-test-map.json, mutation-results.json, *.status/*.log). No live corpus, teacher, frozen assessment, download or production data used.

Exact byte scope; finite correspondence only. Untested branches source-derived.