step-io 0.2.4

STEP (ISO 10303) file I/O for Rust.
Documentation 
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//! `RefGraph` (reverse-reference index) spike: a `CARTESIAN_POINT` referenced by a
//! `LINE` (via `pnt`) and a `VERTEX_POINT` (via `vertex_geometry`) should report
//! both as its referrers — built mechanically over every entity type.

use step_io::EntityKey;
use step_io::generated::model::CartesianPointId;
use step_io::read;

const HEADER: &str = "ISO-10303-21;\nHEADER;\nFILE_DESCRIPTION((''),'2;1');\n\
FILE_NAME('','',(''),(''),'','','');\n\
FILE_SCHEMA(('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF { 1 0 10303 442 3 1 4 }'));\n\
ENDSEC;\nDATA;\n";
const FOOTER: &str = "ENDSEC;\nEND-ISO-10303-21;\n";

const BODY: &str = "\
#1=CARTESIAN_POINT('',(0.0,0.0,0.0));\n\
#2=DIRECTION('',(1.0,0.0,0.0));\n\
#3=VECTOR('',#2,1.0);\n\
#4=LINE('',#1,#3);\n\
#5=VERTEX_POINT('',#1);\n";

#[test]
fn reverse_index_reports_referrers() {
    let src = format!("{HEADER}{BODY}{FOOTER}");
    let (model, _rep) = read(src.as_bytes()).expect("read");

    // The lone cartesian point is arena index 0.
    let cp = EntityKey::CartesianPoint(CartesianPointId(0));
    let graph = model.ref_graph();
    let refs = graph.referrers(cp);

    assert!(
        refs.iter().any(|a| matches!(a, EntityKey::Line(_))),
        "LINE.pnt references the point: {refs:?}"
    );
    assert!(
        refs.iter().any(|a| matches!(a, EntityKey::VertexPoint(_))),
        "VERTEX_POINT.vertex_geometry references the point: {refs:?}"
    );

    // An unreferenced entity has no referrers (the line is a leaf here).
    // (Sanity: a target with no referrers returns an empty slice.)
    assert!(
        graph
            .referrers(EntityKey::CartesianPoint(CartesianPointId(999)))
            .is_empty(),
        "out-of-range / unreferenced target yields empty"
    );
}