mathlib-robots-rules

The groupant beside tools/mathlib/src/robots.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`
cost	partial	invariant-and-cost
descriptant	present	descriptant
invariant	partial	invariant-and-cost
tests	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.

id	type	label	where
`behavior_complement`	behavior_complement	partial source derived model	behavior_complement
`reverse_reconstruction`	reverse_reconstruction	partial source derived model	reverse_reconstruction
`specific_override`	specific_override	partial source derived model	specific_override
`wildcard_compilation`	wildcard_compilation	partial source derived model	wildcard_compilation
`delay_fold`	delay_fold	partial source derived model	delay_fold
`raw_length_specificity`	raw_length_specificity	partial source derived model	raw_length_specificity

Model text

descriptant

mathlib-robots-rules

Parse textual groups into allowed patterns and optional max crawl-delay; allowed chooses matching rule with greatest raw byte length and then allow on tie, default true.

Epoch 2026-10-31

Prospective model retained before changes. Existing production bytes are preserved; additions are bounded inline tests. Nine source groupants expose ingestion and routing boundaries; typed children bind exact source bytes and reuse their parent syntax projection. Native tests run twice per profile; behavior mutants run as compiled source changes and exact bytes are restored before positive checks.

Important retained observation: network-looking helpers are not all pure (DNS inside github_host and books build); selection deliberately excludes those effects. Mixed-format manifest order is not deterministic, and error paths do not imply rollback.

No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.

approximant

Forward relation

Parse textual groups into allowed patterns and optional max crawl-delay; allowed chooses matching rule with greatest raw byte length and then allow on tie, default true.

Model observations include returns, retained state and ordered partial effects; on external failures the successful-prefix relation replaces a total-function claim.

catalog

behavior_complement

Subject: mathlib-robots-rules, source SHA-256 84539710d111a1045385202e26b845b3894fbd8883804cbcbdf39135d6d22897; finite transition observation.

Disallow /a.b$ cannot match /axb because dot is escaped; it cannot match /a.b?x because end anchor requires termination. A tied Allow cannot be overridden by same-length Disallow.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.