Module features 

Feature-schema access + the feature-schema → FormField mapping.

The kernel OWNS the feature definitions (feature_pipeline/schema.rs; each features/<feat>.rs declares its own schema() with an inputParamsSchema). This module reaches that catalogue from native Rust (re-exported by the kernel as brep_kernel::feature_schema_catalogue) and maps ONE feature’s parameter schema into the general FormField list the shared egui form engine renders — the SAME FormFields the settings dialog uses.

The map classifies each kernel param type:

• number → FieldKind::Scalar (unbounded drag value)
• string → FieldKind::Text (id is read-only)
• transform → three FieldKind::Vec3 (position/rotation/scale)
• boolean_operation → an FieldKind::Enum (operation) + a FieldKind::Reference (tools) + a FieldKind::Bool (mergeCoplanarFaces)
• reference_selection→ FieldKind::Reference (the #42 seam)

REFERENCE-SELECTION field types (rendered as the disabled placeholder — the seam for the next slice’s real picker): the top-level reference_selection params, and the targets list inside a boolean_operation. (transform’s optional start reference is not surfaced here yet.)

Functions

feature_catalogue

The kernel-owned feature-schema catalogue ({ version, features: [...] }).

feature_default_params

A feature type’s DEFAULT inputParams, built from its schema: one entry per inputParamsSchema param seeded with that param’s default_value (missing → null). The caller assigns the unique id afterwards (the schema’s id default is null). Additive, engine-owned, and reusable by any “add feature” path so a new feature’s params always track the kernel schema. Unknown types yield an empty object.

feature_form_fields

Map a feature type’s inputParamsSchema into the general form fields, in schema (insertion) order — the kernel builds schemas with serde_json’s preserve_order, so grouped fields stay contiguous for the group headers.

feature_icon

The custom BrepIcons glyph for a feature type, if one exists. Every kernel feature type has a FreeCAD-inspired monoline glyph in the font’s Private-Use block starting at U+E030 (edited as tools/iconfont/glyphs/*.svg). The font is installed as family "brep_icons" at the HEAD of egui’s fallback chain (crate-side fonts.rs), so a bare returned char renders as the icon.

feature_long_name

Human display name for a feature type: the schema longName (else the type itself), with the feature’s BrepIcons glyph PREPENDED. Every consumer that shows a feature name (add-feature palette, history tree, context-bar offers, dialogs) reads it through here, so the icon appears everywhere with no per-caller wiring — see feature_icon.

feature_schema

One feature’s full schema entry, by its type / shortName (e.g. "P.CU", "B"). None if the type is not in the catalogue.

feature_short_name

A feature type’s SHORT name (shortName, e.g. P.CU, S, E), else the type code itself. This is the BASE for a new feature’s id: the engine appends the part history’s persistent global counter to it (P.CU → P.CU7, S → S8) in crate::history::History::next_feature_id.

form_fields_from_schema

Map ANY schema entry carrying an inputParamsSchema object into form fields — the shared engine behind feature_form_fields AND the assembly constraint dialogs (whose schemas come from the kernel’s constraint_schema_catalogue, same shape, different catalogue). One mapping, two catalogues (the schema-driven-dialog principle).