##### Old-style format support

def unescape_table(table):

    '''Currently only works with PostgreSQL.'''

    if table == None: return table

    assert table.count('.') <= 1

    parts = tuple((v.replace('"', '') for v in table.split('"."', 2)))

    if len(parts) == 1: parts, = parts

    return parts

def table2sql_gen(table, table_is_esc=False):

    '''Converts old-style (tuple-based) tables to sql_gen-compatible values.

    @param table_is_esc If False, assumes any table name is not escaped or that

        re-escaping it will produce the same value.

    '''

    if util.is_str(table) and table_is_esc: table = unescape_table(table)

    return as_Table(table)