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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 generate(basename, xml):
    '''generate complete javascript implementation'''

    if basename.endswith('.js'):
        filename = basename
    else:
        filename = basename + '.js'

    msgs = []
    enums = []
    filelist = []
    for x in xml:
        msgs.extend(x.message)
        enums.extend(x.enum)
        filelist.append(os.path.basename(x.filename))

    for m in msgs:
        if xml[0].little_endian:
            m.fmtstr = '<'
        else:
            m.fmtstr = '>'
        for f in m.ordered_fields:
            m.fmtstr += mavfmt(f)
        m.order_map = [ 0 ] * len(m.fieldnames)
        for i in range(0, len(m.fieldnames)):
            m.order_map[i] = m.ordered_fieldnames.index(m.fieldnames[i])

    print("Generating %s" % filename)
    outf = open(filename, "w")
    generate_preamble(outf, msgs, filelist, xml[0])
    generate_enums(outf, enums)
    generate_message_ids(outf, msgs)
    generate_classes(outf, msgs)
    generate_mavlink_class(outf, msgs, xml[0])
    generate_footer(outf)
    outf.close()
    print("Generated %s OK" % filename)