rdfpipe.py 文件源码

def make_option_parser():
    parser_names = _get_plugin_names(Parser)
    serializer_names = _get_plugin_names(Serializer)
    kw_example = "FORMAT:(+)KW1,-KW2,KW3=VALUE"

    oparser = OptionParser(
        "%prog [-h] [-i INPUT_FORMAT] [-o OUTPUT_FORMAT] " +
        "[--ns=PFX=NS ...] [-] [FILE ...]",
        description=__doc__.strip() + (
        " Reads file system paths, URLs or from stdin if '-' is given."
        " The result is serialized to stdout."),
        version="%prog " + "(using rdflib %s)" % rdflib.__version__)

    oparser.add_option(
        '-i', '--input-format',
        type=str,  # default=DEFAULT_INPUT_FORMAT,
        help="Format of the input document(s)."
        " Available input formats are: %s." % parser_names +
        " If no format is given, it will be " +
        "guessed from the file name extension." +
        " Keywords to parser can be given after format like: %s." % kw_example,
        metavar="INPUT_FORMAT")

    oparser.add_option(
        '-o', '--output-format',
        type=str, default=DEFAULT_OUTPUT_FORMAT,
        help="Format of the graph serialization."
        " Available output formats are: %s."
        % serializer_names +
        " Default format is: '%default'." +
        " Keywords to serializer can be given after format like: %s." %
        kw_example,
        metavar="OUTPUT_FORMAT")

    oparser.add_option(
        '--ns',
        action="append", type=str,
        help="Register a namespace binding (QName prefix to a base URI). "
        "This can be used more than once.",
        metavar="PREFIX=NAMESPACE")

    oparser.add_option(
        '--no-guess', dest='guess',
        action='store_false', default=True,
        help="Don't guess format based on file suffix.")

    oparser.add_option(
        '--no-out',
        action='store_true', default=False,
        help="Don't output the resulting graph " +
             "(useful for checking validity of input).")

    oparser.add_option(
        '-w', '--warn',
        action='store_true', default=False,
        help="Output warnings to stderr (by default only critical errors).")

    return oparser