Elamur Groupantsprag-feats-quotes
The groupant beside prag/src/feats.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-feats-quotes-behavior-complement | behavior_complement | partial source model | behavior-complement |
prag-feats-quotes-reverse-reconstruction | reverse_reconstruction | partial source model | reverse-reconstruction |
prag-feats-quotes-coupling | constraint_relation | partial source model | coupling |
prag-feats-quotes-observation-fiber | information_loss | partial source model | observation-fiber |
Model text
One-delimiter quote automaton emits byte spans and persistent open state.
Source snapshot: 2a1a0bd6e43dd16f7284e993f30d0f4971c447c9e2080616033d19ac8693611f. All relations concern this snapshot on the stated admissible domain. Models are source-derived partial relations; finite fixtures are evidence, not general proofs. Complement is a conservative inner constraint model. Reverse reconstruction preserves all compatible antecedents conceptually; no enumerating solver is implemented.
forward
Scan char_indices; double open marks always start when closed; single open marks require nonword predecessor and alphanumeric successor. Matched straight/curly closers emit [start,byte); single apostrophes between alphanumerics do not close. If still open append [start,text.len). Filter empty and nonalphanumeric spans without changing final delimiter state.
behavior-complement
Universe: valid UTF-8 text and states None or one supported opening delimiter paired with intervals/state. Excluded intervals split Unicode codepoints, include their opening delimiter, have empty content, or consist solely of punctuation. A closing apostrophe inside don't cannot terminate a single-quoted span.
reverse-reconstruction
An observed empty span list permits unquoted text, punctuation-only quoted text or empty carried text. Retain all texts and opening states whose automaton ends in observed state and emits exact intervals; absent text content and delimiter style cannot be uniquely recovered from interval lengths.
invariant
Bounds increase and are valid UTF-8 boundaries; emitted content contains an alphanumeric. Open state may survive even when no span survives filtering. Nested quotation is not represented as a stack.
cost
O(B) time and O(B) temporary char-index storage plus spans for B bytes. No measured speedup or executable approximation error bound is claimed.
coupling
extract supplies carry only at adjacent same paragraph/source/doc ordinal. row applies a second direct-speech filter: quote_spans detects delimiters, not narrative intent.
observation-fiber
Straight and curly double closers may complete the same state; punctuation-only quotes disappear from span output but can affect carry. Filtering spans therefore cannot reconstruct raw delimiter events.
composition
extract supplies carry only at adjacent same paragraph/source/doc ordinal. row applies a second direct-speech filter: quote_spans detects delimiters, not narrative intent. No child fragments; this is one scoped relation.
checks
quote_unicode_state_and_content_bounds: six literal texts, mixed Unicode, apostrophe interior, adjacent spans, carried Unicode and empty carry. See the file-level evidence.md for exact log hashes and repeated run outcomes.
epoch-memory
2026-10-30 wave13: initial source-bound model. Prospective model preceded edits. Existing normalization and quote rules were retained; tests expose their information loss. Source identity witness justified qualifying predecessor keys by Src. Annotation is isolated behind a private closure used by the production row wrapper; fixtures do not call or certify tokenizer/parser. AST is a partial syntax projection, macro bodies opaque; semantic AST, live model/corpus and general proof remain absent.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/prag/src/feats.rs.groupant/quotes.groupant/