Status: accepted. P5_071 completes the bounded native schematic producer by appending hierarchical sheet records after every placed-symbol overplot. It retains the Python authority's sheet box, pin, visible-field, DNP, identity, and source-order behavior while preserving all earlier foundation, annotation, graphics, and symbol entry points.
Core selects only direct top-level (sheet ...) spans and
parses each selected carrier under the existing aggregate source, depth,
node, and selected-form ceilings. Connectivity-oriented sheet models are
not reused because they deliberately omit plot styling and quantize pin
positions. Sheet records retain source order but are emitted only after all
symbol instances and overlap records.
An opaque authored background emits a filled rectangle followed by the
border. A missing or transparent background emits the same no-fill border
twice, preserving KiCad's two plotting passes. Every identified sheet pin
is enclosed by a typed StartBlock/EndBlock pair
containing its Text. Input, output, bidirectional, tri-state, and passive
shapes append their exact decoration; dot, round, diamond, and rectangle
preserve Python's text-only block with no decoration. UUIDs win; otherwise
a bounded parent-and-name identity is synthesized. Pins without a valid
identity remain ungrouped.
Visible properties follow all pins in authored order. Sheetname, Sheetfile, custom-field, show-name, justification, font, and hyperlink behavior remains exact; sheet field and pin text deliberately do not expand project variables. DNP sheets preserve an opaque background, dim every subsequent colored operation, and append the two canonical diagonal marker strokes over bounds that include pin and property text.
Project variables, drawing settings, worksheet bytes, occurrence context, and font bytes remain explicit caller-owned sidecars. DNP text measurement reuses the document's single authenticated font session; core performs no filesystem, project, or platform-font discovery.
Independent ceilings bound sheets, authored sheet properties, and sheet pins in addition to aggregate records, operations, input/output points, retained text and metadata, parse work, and font work. Coordinate sums, text offsets, decoration points, bounds, DNP margins, and marker endpoints are checked for finite JavaScript-safe results before publication. Malformed or resource-exhausted inputs return no partial document.
Native geometry deliberately fails closed where Python's permissive model would publish a contract-incoherent result: positive dimensions must remain positive after nanometre rounding, independently rounded position, size, and far corner must agree, and pin angles must fit the exact JavaScript-safe conversion range. Authored negative sheet strokes are not rejected because Python defines them as a zero-width border; the native record and strict semantic contract preserve that result.
The strict schematic contract gains one terminal sheet
record and a producer-local six-kind operation union for Rect, Text,
PlotPoly, ThickSegment, and typed sheet-pin block markers. Semantic
validation enforces record identity, positive size, exact local indexes,
body-pass ordering, block ownership, parent linkage, layerless state, and
terminal DNP marker state. Generated Rust, Python, TypeScript, and JSON
Schema projections regenerate atomically during the pre-freeze a0 window.
The hermetic Python vectors declare sheets before symbols in source yet
prove their terminal output phase. They cover an opaque DNP sheet, a
transparent duplicate-border sheet, all nine pin shapes, five exact
decorations, four decoration-free directive shapes, cardinal and fallback
rotations, bus and slash display rules, authored and synthesized pin IDs,
hyperlinks, visible/hidden/custom fields, literal project tokens, ignored
instance metadata, zero-width negative-stroke authority, dimming, and exact
DNP bounds with the checked-in fixture font. Rack L1_036,
focused resource tests, semantic mutations, and generation checks own
executable evidence. No WASM or Cruncher endpoint is added by this
native-first slice.