private static String basedir()

in maven-resolver-api/src/main/java/org/eclipse/aether/repository/RepositoryUriUtils.java [66:107]
30 lines of code
13 McCabe index (conditional complexity)

    private static String basedir(String url) {
        String protocol = protocol(url);

        String retValue;

        if (!protocol.isEmpty()) {
            retValue = url.substring(protocol.length() + 1);
        } else {
            retValue = url;
        }
        retValue = decode(retValue);
        // special case: if omitted // on protocol, keep path as is
        if (retValue.startsWith("//")) {
            retValue = retValue.substring(2);

            if (retValue.length() >= 2 && (retValue.charAt(1) == '|' || retValue.charAt(1) == ':')) {
                // special case: if there is a windows drive letter, then keep the original return value
                retValue = retValue.charAt(0) + ":" + retValue.substring(2);
            } else {
                // Now we expect the host
                int index = retValue.indexOf("/");
                if (index >= 0) {
                    retValue = retValue.substring(index + 1);
                }

                // special case: if there is a windows drive letter, then keep the original return value
                if (retValue.length() >= 2 && (retValue.charAt(1) == '|' || retValue.charAt(1) == ':')) {
                    retValue = retValue.charAt(0) + ":" + retValue.substring(2);
                } else if (index >= 0) {
                    // leading / was previously stripped
                    retValue = "/" + retValue;
                }
            }
        }

        // special case: if there is a windows drive letter using |, switch to :
        if (retValue.length() >= 2 && retValue.charAt(1) == '|') {
            retValue = retValue.charAt(0) + ":" + retValue.substring(2);
        }

        return retValue.trim();
    }