fn parse_enum()

in avro/src/schema.rs [1842:1914]
61 lines of code
9 McCabe index (conditional complexity)

    fn parse_enum(
        &mut self,
        complex: &Map<String, Value>,
        enclosing_namespace: &Namespace,
    ) -> AvroResult<Schema> {
        let symbols_opt = complex.get("symbols");

        if symbols_opt.is_none() {
            if let Some(seen) = self.get_already_seen_schema(complex, enclosing_namespace) {
                return Ok(seen.clone());
            }
        }

        let fully_qualified_name = Name::parse(complex, enclosing_namespace)?;
        let aliases = fix_aliases_namespace(complex.aliases(), &fully_qualified_name.namespace);

        let symbols: Vec<String> = symbols_opt
            .and_then(|v| v.as_array())
            .ok_or(Error::GetEnumSymbolsField)
            .and_then(|symbols| {
                symbols
                    .iter()
                    .map(|symbol| symbol.as_str().map(|s| s.to_string()))
                    .collect::<Option<_>>()
                    .ok_or(Error::GetEnumSymbols)
            })?;

        let mut existing_symbols: HashSet<&String> = HashSet::with_capacity(symbols.len());
        for symbol in symbols.iter() {
            validate_enum_symbol_name(symbol)?;

            // Ensure there are no duplicate symbols
            if existing_symbols.contains(&symbol) {
                return Err(Error::EnumSymbolDuplicate(symbol.to_string()));
            }

            existing_symbols.insert(symbol);
        }

        let mut default: Option<String> = None;
        if let Some(value) = complex.get("default") {
            if let Value::String(ref s) = *value {
                default = Some(s.clone());
            } else {
                return Err(Error::EnumDefaultWrongType(value.clone()));
            }
        }

        if let Some(ref value) = default {
            let resolved = types::Value::from(value.clone())
                .resolve_enum(&symbols, &Some(value.to_string()), &None)
                .is_ok();
            if !resolved {
                return Err(Error::GetEnumDefault {
                    symbol: value.to_string(),
                    symbols,
                });
            }
        }

        let schema = Schema::Enum(EnumSchema {
            name: fully_qualified_name.clone(),
            aliases: aliases.clone(),
            doc: complex.doc(),
            symbols,
            default,
            attributes: self.get_custom_attributes(complex, vec!["symbols"]),
        });

        self.register_parsed_schema(&fully_qualified_name, &schema, &aliases);

        Ok(schema)
    }