__init__.py 文件源码

def vtt_dump(infile, outfile=None, **kwargs):
    if not os.path.exists(infile):
        raise VTTLibArgumentError("'%s' not found" % infile)

    font = TTFont(infile)

    if font.sfntVersion not in ("\x00\x01\x00\x00", "true"):
        raise VTTLibArgumentError("Not a TrueType font (bad sfntVersion)")
    for table_tag in VTT_TABLES:
        if table_tag not in font:
            raise VTTLibArgumentError(
                "Table '%s' not found in input font" % table_tag)

    if not outfile:
        ufo = os.path.splitext(infile)[0] + ".ufo"
    else:
        ufo = outfile
    if not os.path.exists(ufo) or not os.path.isdir(ufo):
        raise VTTLibArgumentError("No such directory: '%s'" % ufo)

    check_ufo_version(ufo)

    folder = os.path.join(ufo, "data", TTX_DATA_FOLDER)
    # create data sub-folder if it doesn't exist already
    try:
        os.makedirs(folder)
    except OSError as e:
        if e.errno != errno.EEXIST or not os.path.isdir(folder):
            raise

    normalize_vtt_programs(font)

    ufo_contents = read_ufo_contents(ufo)
    subset_vtt_glyph_programs(font, list(ufo_contents))

    for tag in VTT_TABLES:
        # dump each table individually instead of using 'splitTables'
        # to avoid creating an extra index file
        outfile = os.path.join(folder, tagToIdentifier(tag) + '.ttx')
        # always use Unix LF newlines
        font.saveXML(outfile, tables=[tag], newlinestr='\n')

    write_maxp_data(font, ufo)