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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def all_to_intermediary(filename_or_input, schema=None):
 """ Dispatch the filename_or_input to the different function to produce the intermediary syntax. All the supported classes names are in `swich_input_class_to_method`. The input can also be a list of strings in markdown format or a filename finishing by '.er' containing markdown format. """

    # Try to convert from the name of the class
    input_class_name = filename_or_input.__class__.__name__
    try:
        this_to_intermediary = switch_input_class_to_method[input_class_name]
        tables, relationships = this_to_intermediary(filename_or_input)
        return tables, relationships
    except KeyError:
        pass

    # try to read markdown file.
    if isinstance(filename_or_input, basestring):
        if filename_or_input.split('.')[-1] == 'er':
            return markdown_file_to_intermediary(filename_or_input)

    # try to read a markdown in a string
    if not isinstance(filename_or_input, basestring):
        if all(isinstance(e, basestring) for e in filename_or_input):
            return line_iterator_to_intermediary(filename_or_input)

    # try to read DB URI.
    try:
        make_url(filename_or_input)
        return database_to_intermediary(filename_or_input, schema=schema)
    except ArgumentError:
        pass

    msg = 'Cannot process filename_or_input {}'.format(input_class_name)
    raise ValueError(msg)