fn new()

in guppy/src/graph/build.rs [681:724]

• 38 lines of code
• 5 McCabe index (conditional complexity)

    fn new<'a>(
        from_id: &PackageId,
        name: &str,
        resolved_name: &str,
        deps: impl IntoIterator<Item = &'a Dependency>,
    ) -> Result<Self, Error> {
        let mut version_req = None;
        let mut normal = DependencyReqImpl::default();
        let mut build = DependencyReqImpl::default();
        let mut dev = DependencyReqImpl::default();
        for dep in deps {
            // Dev dependencies cannot be optional.
            if dep.kind == DependencyKind::Development && dep.optional {
                return Err(Error::PackageGraphConstructError(format!(
                    "for package '{}': dev-dependency '{}' marked optional",
                    from_id, name,
                )));
            }

            // Pick the first version req that this come across.
            if version_req.is_none() {
                version_req = Some(dep.req.clone());
            }

            match dep.kind {
                DependencyKind::Normal => normal.add_instance(from_id, dep)?,
                DependencyKind::Build => build.add_instance(from_id, dep)?,
                DependencyKind::Development => dev.add_instance(from_id, dep)?,
                _ => {
                    // unknown dependency kind -- can't do much with this!
                    continue;
                }
            };
        }

        Ok(Self {
            dep_name: name.into(),
            resolved_name: resolved_name.into(),
            version_req: version_req.expect("at least one dependency instance"),
            normal,
            build,
            dev,
        })
    }