fn try_from()

in uniffi_udl/src/attributes.rs [60:114]
53 lines of code
1 McCabe index (conditional complexity)

    fn try_from(
        weedle_attribute: &weedle::attribute::ExtendedAttribute<'_>,
    ) -> Result<Self, anyhow::Error> {
        match weedle_attribute {
            // Matches plain named attributes like "[ByRef"].
            weedle::attribute::ExtendedAttribute::NoArgs(attr) => match (attr.0).0 {
                "ByRef" => Ok(Attribute::ByRef),
                "Enum" => Ok(Attribute::Enum),
                "Error" => Ok(Attribute::Error),
                "Custom" => Ok(Attribute::Custom { crate_name: None }),
                "Trait" => Ok(Attribute::Trait),
                "WithForeign" => Ok(Attribute::WithForeign),
                "Async" => Ok(Attribute::Async),
                "NonExhaustive" => Ok(Attribute::NonExhaustive),
                "Remote" => Ok(Attribute::Remote),
                _ => anyhow::bail!("ExtendedAttributeNoArgs not supported: {:?}", (attr.0).0),
            },
            // Matches assignment-style attributes like ["Throws=Error"]
            weedle::attribute::ExtendedAttribute::Ident(identity) => {
                match identity.lhs_identifier.0 {
                    "Name" => Ok(Attribute::Name(name_from_id_or_string(&identity.rhs))),
                    "Throws" => Ok(Attribute::Throws(name_from_id_or_string(&identity.rhs))),
                    "Self" => Ok(Attribute::SelfType(SelfType::try_from(&identity.rhs)?)),
                    "External" => Ok(Attribute::External {
                        crate_name: name_from_id_or_string(&identity.rhs),
                    }),
                    "Custom" => Ok(Attribute::Custom {
                        crate_name: Some(name_from_id_or_string(&identity.rhs)),
                    }),
                    _ => anyhow::bail!(
                        "Attribute identity Identifier not supported: {:?}",
                        identity.lhs_identifier.0
                    ),
                }
            }
            weedle::attribute::ExtendedAttribute::IdentList(attr_list) => {
                match attr_list.identifier.0 {
                    "Traits" => Ok(Attribute::Traits(
                        attr_list
                            .list
                            .body
                            .list
                            .iter()
                            .map(|i| i.0.to_string())
                            .collect(),
                    )),
                    _ => anyhow::bail!(
                        "Attribute identity list not supported: {:?}",
                        attr_list.identifier.0
                    ),
                }
            }
            _ => anyhow::bail!("Attribute not supported: {:?}", weedle_attribute),
        }
    }