step-io 0.2.4

STEP (ISO 10303) file I/O for Rust.
Documentation 
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//! `read()` surfaces the identified source schema on the model's header —
//! `model.header().schema` — how a caller (e.g. a CAD kernel) learns the
//! file's precise AP / edition / stage. Inline STEP docs, not valid-CAD
//! fixtures.

use step_io::{ApFamily, Stage, read};

fn doc_with_schema(file_schema: &str) -> String {
    format!(
        "ISO-10303-21;\nHEADER;\n\
         FILE_DESCRIPTION((''),'2;1');\n\
         FILE_NAME('','',(''),(''),'','','');\n\
         FILE_SCHEMA(('{file_schema}'));\n\
         ENDSEC;\nDATA;\n#1=APPLICATION_CONTEXT('');\nENDSEC;\nEND-ISO-10303-21;\n"
    )
}

#[test]
fn read_reports_ap242_ed2() {
    let src =
        doc_with_schema("AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF { 1 0 10303 442 3 1 4 }");
    let (model, _report) = read(src.as_bytes()).expect("read ok");
    let schema = &model.header().schema;
    assert_eq!(schema.family, ApFamily::Ap242);
    assert_eq!(schema.edition, Some(2));
    assert_eq!(schema.stage, Stage::Is);
    assert_eq!(schema.to_string(), "AP242 ed2 (IS)");
    // Raw FILE_SCHEMA preserved verbatim for byte-exact round-trip.
    assert!(
        schema
            .raw()
            .is_some_and(|r| r.as_slice()[0].contains("442 3 1 4"))
    );
}

#[test]
fn read_reports_ap214_ed3() {
    let src = doc_with_schema("AUTOMOTIVE_DESIGN { 1 0 10303 214 3 1 1 }");
    let (model, _report) = read(src.as_bytes()).expect("read ok");
    let schema = &model.header().schema;
    assert_eq!(schema.family, ApFamily::Ap214);
    assert_eq!(schema.edition, Some(3));
    assert_eq!(schema.stage, Stage::Is);
}

#[test]
fn read_reports_unrecognized_schema() {
    let src = doc_with_schema("SOME_PRIVATE_SCHEMA");
    let (model, _report) = read(src.as_bytes()).expect("read ok");
    let schema = &model.header().schema;
    assert_eq!(schema.family, ApFamily::Other);
    assert!(!schema.is_recognized());
}