Elamur Groupantsworld-schooltools-parsing-key-fields
The groupant beside world/src/schooltools.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 |
|---|---|---|---|
world-schooltools-parsing-key-fields-behavior-complement | behavior_complement | partial source model | behavior-complement |
world-schooltools-parsing-key-fields-reverse-reconstruction | reverse_reconstruction | partial source model | reverse-reconstruction |
world-schooltools-parsing-key-fields-first_colon | delimiter_relation | partial source model | first_colon |
world-schooltools-parsing-key-fields-empty_field_retention | shape_relation | partial source model | empty_field_retention |
world-schooltools-parsing-key-fields-key_case | domain_boundary | partial source model | key_case |
world-schooltools-parsing-key-fields-borrowed_projection | information_loss | partial source model | borrowed_projection |
Model text
Wave34, 2026-10-31. Source-bound helper model; no universal proof or approximation-error certificate. Historical parent epoch remains intact.
forward
Trim line, reject leading #, split at first colon, trim key, accept exactly exercise/test/exam. Split value at every | and trim each field, retaining empty fields and arbitrary width.
invariant
Recognized malformed option lines remain Some; this parser does not enforce five fields or one answer marker. Returned slices borrow original text.
cost
O(B+F) scanning/vector storage for B bytes and F fields; no copied field strings.
composition
Parsing precedes canon in tally/lint/edit. Lint separately emits tabs on all lines before recognizing option lines; parse refusal does not suppress that nonoption diagnostic.
behavior-complement
Exclude recognition of comments, uppercase Test and fact keys; exclude splitting key/value at a later colon; exclude dropping empty fields between adjacent bars. Recognition is not content validity.
reverse-reconstruction
For observed (key,fields), compatible lines include any surrounding/field whitespace with the same trimmed slices, plus colons within values. None includes no colon, comments and every unrecognized key. Whitespace and its byte positions are lost.
first_colon
Only first colon separates the kind; subsequent colons are ordinary value characters until bar splitting.
empty_field_retention
A recognized value with m bars returns m+1 fields, including leading/trailing/adjacent empty values; even no bar returns one field.
key_case
Three literal lowercase keys after trimming are admitted; case folding is absent. Comment recognition precedes colon lookup.
borrowed_projection
Field strings are trim-normalized borrowed slices; parser output cannot recover indentation or spacing around bars without retaining the original input.
checks
Exact world library selections: schooltools::wave9_models::parser_canonical_fibers_and_tally. Current repeated debug/release outcomes and compiled controls are in the root sidecar wave34-evidence.md. Only these supplied-input tests are current evidence; older parent module-wide receipts are historical. Macro bodies remain opaque.
epoch-memory
Prospective model saved before edits. This epoch deepens one existing node rather than renaming it. Production implementation unchanged; tests add helper-boundary observations where stated. No live lessons, frozen suites, model loading, teacher or network. Read-only symbolic relations are broader than the finite native domain.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/world/src/schooltools.rs.groupant/parsing.groupant/key-fields.groupant/