check_path

# File lib/uri/generic.rb, line 748
    def check_path(v)
      # raise if both hier and opaque are not nil, because:
      # absoluteURI   = scheme ":" ( hier_part | opaque_part )
      # hier_part     = ( net_path | abs_path ) [ "?" query ]
      if v && @opaque
        raise InvalidURIError,
          "path conflicts with opaque"
      end

      # If scheme is ftp, path may be relative.
      # See RFC 1738 section 3.2.2, and RFC 2396.
      if @scheme && @scheme != "ftp"
        if v && v != '' && parser.regexp[:ABS_PATH] !~ v
          raise InvalidComponentError,
            "bad component(expected absolute path component): #{v}"
        end
      else
        if v && v != '' && parser.regexp[:ABS_PATH] !~ v &&
           parser.regexp[:REL_PATH] !~ v
          raise InvalidComponentError,
            "bad component(expected relative path component): #{v}"
        end
      end

      return true
    end