def parse_decimal_formats(data, tree):
    decimal_formats = data.setdefault('decimal_formats', {})
    for df_elem in tree.findall('.//decimalFormats'):
        if _should_skip_number_elem(data, df_elem):  # TODO: Support other number systems
            continue
        for elem in df_elem.findall('./decimalFormatLength'):
            length_type = elem.attrib.get('type')
            if _should_skip_elem(elem, length_type, decimal_formats):
                continue
            if elem.findall('./alias'):
                # TODO map the alias to its target
                continue
            for pattern_el in elem.findall('./decimalFormat/pattern'):
                pattern_type = pattern_el.attrib.get('type')
                pattern = numbers.parse_pattern(text_type(pattern_el.text))
                if pattern_type:
                    # This is a compact decimal format, see:
                    # https://www.unicode.org/reports/tr35/tr35-45/tr35-numbers.html#Compact_Number_Formats

                    # These are mapped into a `compact_decimal_formats` dictionary
                    # with the format {length: {count: {multiplier: pattern}}}.

                    # TODO: Add support for formatting them.
                    compact_decimal_formats = data.setdefault('compact_decimal_formats', {})
                    length_map = compact_decimal_formats.setdefault(length_type, {})
                    length_count_map = length_map.setdefault(pattern_el.attrib['count'], {})
                    length_count_map[pattern_type] = pattern
                else:
                    # Regular decimal format.
                    decimal_formats[length_type] = pattern

def parse_currency_formats(data, tree):
    currency_formats = data.setdefault('currency_formats', {})
    for currency_format in tree.findall('.//currencyFormats'):
        if _should_skip_number_elem(data, currency_format):  # TODO: Support other number systems
            continue

        for length_elem in currency_format.findall('./currencyFormatLength'):
            curr_length_type = length_elem.attrib.get('type')
            for elem in length_elem.findall('currencyFormat'):
                type = elem.attrib.get('type')
                if curr_length_type:
                    # Handle `<currencyFormatLength type="short">`, etc.
                    # TODO(3.x): use nested dicts instead of colon-separated madness
                    type = '%s:%s' % (type, curr_length_type)
                if _should_skip_elem(elem, type, currency_formats):
                    continue
                for child in elem.getiterator():
                    if child.tag == 'alias':
                        currency_formats[type] = Alias(
                            _translate_alias(['currency_formats', elem.attrib['type']],
                                             child.attrib['path'])
                        )
                    elif child.tag == 'pattern':
                        pattern = text_type(child.text)
                        currency_formats[type] = numbers.parse_pattern(pattern)

def test_parse_pattern_negative():

    # No negative format specified
    np = numbers.parse_pattern(u'¤#,##0.00')
    assert np.prefix == (u'¤', u'-¤')
    assert np.suffix == (u'', u'')

    # Negative format is specified
    np = numbers.parse_pattern(u'¤#,##0.00;(¤#,##0.00)')
    assert np.prefix == (u'¤', u'(¤')
    assert np.suffix == (u'', u')')

    # Negative sign is a suffix
    np = numbers.parse_pattern(u'¤ #,##0.00;¤ #,##0.00-')
    assert np.prefix == (u'¤ ', u'¤ ')
    assert np.suffix == (u'', u'-')

def load_i18n(project_root, tell_sentry):
    # Load the locales
    localeDir = os.path.join(project_root, 'i18n', 'core')
    locales = LOCALES
    for file in os.listdir(localeDir):
        try:
            parts = file.split(".")
            if not (len(parts) == 2 and parts[1] == "po"):
                continue
            lang = parts[0]
            with open(os.path.join(localeDir, file)) as f:
                l = locales[lang.lower()] = Locale(lang)
                c = l.catalog = read_po(f)
                c.plural_func = get_function_from_rule(c.plural_expr)
                try:
                    l.countries = make_sorted_dict(COUNTRIES, l.territories)
                except KeyError:
                    l.countries = COUNTRIES
                try:
                    l.languages_2 = make_sorted_dict(LANGUAGES_2, l.languages)
                except KeyError:
                    l.languages_2 = LANGUAGES_2
        except Exception as e:
            tell_sentry(e, {})

    # Add aliases
    for k, v in list(locales.items()):
        locales.setdefault(ALIASES.get(k, k), v)
        locales.setdefault(ALIASES_R.get(k, k), v)
    for k, v in list(locales.items()):
        locales.setdefault(k.split('_', 1)[0], v)

    # Patch the locales to look less formal
    locales['fr'].currency_formats[None] = parse_pattern('#,##0.00\u202f\xa4')
    locales['fr'].currency_symbols['USD'] = '$'

def format_scientific_field(spec, prec, number, locale):
    prec = SCIENTIFIC_DECIMAL_DIGITS if prec is None else int(prec)
    format_ = u'0.%sE+000' % (u'#' * prec)
    pattern = parse_pattern(format_)
    decimal_symbol = get_decimal_symbol(locale)
    string = pattern.apply(number, locale).replace(u'.', decimal_symbol)
    return string.lower() if spec.islower() else string

def test_parse_pattern():

    # Original pattern is preserved
    np = numbers.parse_pattern(u'¤#,##0.00')
    assert np.pattern == u'¤#,##0.00'

    np = numbers.parse_pattern(u'¤#,##0.00;(¤#,##0.00)')
    assert np.pattern == u'¤#,##0.00;(¤#,##0.00)'

    # Given a NumberPattern object, we don't return a new instance.
    # However, we don't cache NumberPattern objects, so calling
    # parse_pattern with the same format string will create new
    # instances
    np1 = numbers.parse_pattern(u'¤ #,##0.00')
    np2 = numbers.parse_pattern(u'¤ #,##0.00')
    assert np1 is not np2
    assert np1 is numbers.parse_pattern(np1)

def test_numberpattern_repr():
    """repr() outputs the pattern string"""

    # This implementation looks a bit funny, but that's cause strings are
    # repr'd differently in Python 2 vs 3 and this test runs under both.
    format = u'¤#,##0.00;(¤#,##0.00)'
    np = numbers.parse_pattern(format)
    assert repr(format) in repr(np)

def parse_percent_formats(data, tree):
    percent_formats = data.setdefault('percent_formats', {})
    for elem in tree.findall('.//percentFormats/percentFormatLength'):
        type = elem.attrib.get('type')
        if _should_skip_elem(elem, type, percent_formats):
            continue
        pattern = text_type(elem.findtext('percentFormat/pattern'))
        percent_formats[type] = numbers.parse_pattern(pattern)

def format_number(value, digits=None):
    locale = get_current_babel_locale()
    if digits is None:
        return format_decimal(value, locale=locale)
    (min_digits, max_digits) = (
        digits if isinstance(digits, tuple) else (digits, digits))
    format = locale.decimal_formats.get(None)
    pattern = parse_pattern(format)  # type: babel.numbers.NumberPattern
    return pattern.apply(value, locale, force_frac=(min_digits, max_digits))

def format_float_field(__, prec, number, locale):
    """Formats a fixed-point field."""
    format_ = u'0.'
    if prec is None:
        format_ += u'#' * NUMBER_DECIMAL_DIGITS
    else:
        format_ += u'0' * int(prec)
    pattern = parse_pattern(format_)
    return pattern.apply(number, locale)

def format_field(spec, arg, value, locale):
    if spec and isinstance(value, Number):
        if arg:
            spec += arg
        try:
            pattern = parse_pattern(spec)
        except ValueError:
            return spec
        else:
            return pattern.apply(value, locale)
    return str(value)

def parse_decimal_formats(data, tree):
    decimal_formats = data.setdefault('decimal_formats', {})
    for elem in tree.findall('.//decimalFormats/decimalFormatLength'):
        type = elem.attrib.get('type')
        if _should_skip_elem(elem, type, decimal_formats):
            continue
        if elem.findall('./alias'):
            # TODO map the alias to its target
            continue
        pattern = text_type(elem.findtext('./decimalFormat/pattern'))
        decimal_formats[type] = numbers.parse_pattern(pattern)

def parse_scientific_formats(data, tree):
    scientific_formats = data.setdefault('scientific_formats', {})
    for sf_elem in tree.findall('.//scientificFormats'):
        if _should_skip_number_elem(data, sf_elem):  # TODO: Support other number systems
            continue
        for elem in sf_elem.findall('./scientificFormatLength'):
            type = elem.attrib.get('type')
            if _should_skip_elem(elem, type, scientific_formats):
                continue
            pattern = text_type(elem.findtext('scientificFormat/pattern'))
            scientific_formats[type] = numbers.parse_pattern(pattern)

    def processFormats(self, locale, formats):
        '''
        Process the formats to a complete list of formats that will be used by conversion.
        '''
        assert isinstance(formats, dict), 'Invalid formats %s' % formats
        assert isinstance(locale, Locale), 'Invalid locale %s' % locale

        for clsTyp, format in formats.items():
            # In here we just check that the format is valid.
            try:
                if clsTyp in (Number, Percentage): bn.parse_pattern(format)
                elif format not in self.formats[clsTyp]: bd.parse_pattern(format)
            except Exception as e:
                raise FormatError('invalid %s format \'%s\' because: %s' % (clsTyp.__name__, format, str(e)))

        if Number not in formats: formats[Number] = locale.decimal_formats.get(None).pattern
        if Percentage not in formats: formats[Percentage] = locale.percent_formats.get(None).pattern

        for clsTyp, default in self.defaults.items():
            if clsTyp not in formats: formats[clsTyp] = default

        return formats

def parse_currency_formats(data, tree):
    currency_formats = data.setdefault('currency_formats', {})
    for length_elem in tree.findall('.//currencyFormats/currencyFormatLength'):
        curr_length_type = length_elem.attrib.get('type')
        for elem in length_elem.findall('currencyFormat'):
            type = elem.attrib.get('type')
            if curr_length_type:
                # Handle `<currencyFormatLength type="short">`, etc.
                type = '%s:%s' % (type, curr_length_type)
            if _should_skip_elem(elem, type, currency_formats):
                continue
            for child in elem.getiterator():
                if child.tag == 'alias':
                    currency_formats[type] = Alias(
                        _translate_alias(['currency_formats', elem.attrib['type']],
                                         child.attrib['path'])
                    )
                elif child.tag == 'pattern':
                    pattern = text_type(child.text)
                    currency_formats[type] = numbers.parse_pattern(pattern)

def load_i18n(website):
    # Load the locales
    key = lambda t: strip_accents(t[1])
    localeDir = os.path.join(website.project_root, 'i18n', 'core')
    locales = website.locales = {}
    for file in os.listdir(localeDir):
        try:
            parts = file.split(".")
            if not (len(parts) == 2 and parts[1] == "po"):
                continue
            lang = parts[0]
            with open(os.path.join(localeDir, file)) as f:
                l = locales[lang.lower()] = Locale(lang)
                c = l.catalog = read_po(f)
                c.plural_func = get_function_from_rule(c.plural_expr)
                try:
                    l.countries_map = {k: l.territories[k] for k in COUNTRIES_MAP}
                    l.countries = sorted(l.countries_map.items(), key=key)
                except KeyError:
                    l.countries_map = COUNTRIES_MAP
                    l.countries = COUNTRIES
        except Exception as e:
            website.tell_sentry(e)

    # Add the default English locale
    locale_en = website.locale_en = locales['en'] = Locale('en')
    locale_en.catalog = Catalog('en')
    locale_en.catalog.plural_func = lambda n: n != 1
    locale_en.countries = COUNTRIES
    locale_en.countries_map = COUNTRIES_MAP

    # Add aliases
    for k, v in list(locales.items()):
        locales.setdefault(ALIASES.get(k, k), v)
        locales.setdefault(ALIASES_R.get(k, k), v)
    for k, v in list(locales.items()):
        locales.setdefault(k.split('_', 1)[0], v)

    # Patch the locales to look less formal
    locales['fr'].currency_formats[None] = parse_pattern('#,##0.00\u202f\xa4')
    locales['fr'].currency_symbols['USD'] = '$'

def test_parse_static_pattern():
    assert numbers.parse_pattern('Kun')  # in the So locale in CLDR 30

#.........这里部分代码省略.........
                            widths[int(elem.attrib["type"])] = text_type(elem.text)
                        elif elem.tag == "alias":
                            ctxts[width_type] = Alias(
                                _translate_alias(["quarters", ctxt_type, width_type], elem.attrib["path"])
                            )

            eras = data.setdefault("eras", {})
            for width in calendar.findall("eras/*"):
                width_type = NAME_MAP[width.tag]
                widths = eras.setdefault(width_type, {})
                for elem in width.getiterator():
                    if elem.tag == "era":
                        if ("draft" in elem.attrib or "alt" in elem.attrib) and int(elem.attrib["type"]) in widths:
                            continue
                        widths[int(elem.attrib.get("type"))] = text_type(elem.text)
                    elif elem.tag == "alias":
                        eras[width_type] = Alias(_translate_alias(["eras", width_type], elem.attrib["path"]))

            # AM/PM
            periods = data.setdefault("periods", {})
            for day_period_width in calendar.findall("dayPeriods/dayPeriodContext/dayPeriodWidth"):
                if day_period_width.attrib["type"] == "wide":
                    for day_period in day_period_width.findall("dayPeriod"):
                        if "alt" not in day_period.attrib:
                            periods[day_period.attrib["type"]] = text_type(day_period.text)

            date_formats = data.setdefault("date_formats", {})
            for format in calendar.findall("dateFormats"):
                for elem in format.getiterator():
                    if elem.tag == "dateFormatLength":
                        if "draft" in elem.attrib and elem.attrib.get("type") in date_formats:
                            continue
                        try:
                            date_formats[elem.attrib.get("type")] = dates.parse_pattern(
                                text_type(elem.findtext("dateFormat/pattern"))
                            )
                        except ValueError as e:
                            error(e)
                    elif elem.tag == "alias":
                        date_formats = Alias(_translate_alias(["date_formats"], elem.attrib["path"]))

            time_formats = data.setdefault("time_formats", {})
            for format in calendar.findall("timeFormats"):
                for elem in format.getiterator():
                    if elem.tag == "timeFormatLength":
                        if ("draft" in elem.attrib or "alt" in elem.attrib) and elem.attrib.get("type") in time_formats:
                            continue
                        try:
                            time_formats[elem.attrib.get("type")] = dates.parse_pattern(
                                text_type(elem.findtext("timeFormat/pattern"))
                            )
                        except ValueError as e:
                            error(e)
                    elif elem.tag == "alias":
                        time_formats = Alias(_translate_alias(["time_formats"], elem.attrib["path"]))

            datetime_formats = data.setdefault("datetime_formats", {})
            for format in calendar.findall("dateTimeFormats"):
                for elem in format.getiterator():
                    if elem.tag == "dateTimeFormatLength":
                        if ("draft" in elem.attrib or "alt" in elem.attrib) and elem.attrib.get(
                            "type"
                        ) in datetime_formats:
                            continue
                        try:
                            datetime_formats[elem.attrib.get("type")] = text_type(

                    l.countries = COUNTRIES
    return langs


# Load the locales
LOCALES = load_langs("i18n")

# Add the default English locale
LOCALE_EN = LOCALES['en'] = Locale('en')
LOCALE_EN.catalog = Catalog('en')
LOCALE_EN.catalog.plural_func = lambda n: n != 1
LOCALE_EN.countries = COUNTRIES
LOCALE_EN.countries_map = COUNTRIES_MAP

# Patch the locales to look less formal
LOCALE_EN.currency_formats[None] = parse_pattern('\xa4#,##0.##')
LOCALES['fr'].currency_formats[None] = parse_pattern('#,##0.##\u202f\xa4')
LOCALES['fr'].currency_symbols['USD'] = '$'


def get_locale_for_request(request):
    accept_lang = request.headers.get("Accept-Language", "")
    languages = (lang.split(";", 1)[0] for lang in accept_lang.split(","))
    for lang in languages:
        lang = regularize_locale(lang)
        loc = LOCALES.get(lang)
        if loc:
            return loc
    return LOCALE_EN

#.........这里部分代码省略.........
                width_type = NAME_MAP[width.tag]
                widths = eras.setdefault(width_type, {})
                for elem in width.getiterator():
                    if elem.tag == 'era':
                        if ('draft' in elem.attrib or 'alt' in elem.attrib) \
                                and int(elem.attrib['type']) in widths:
                            continue
                        widths[int(elem.attrib.get('type'))] = text_type(elem.text)
                    elif elem.tag == 'alias':
                        eras[width_type] = Alias(
                            _translate_alias(['eras', width_type],
                                             elem.attrib['path'])
                        )

            # AM/PM
            periods = data.setdefault('periods', {})
            for day_period_width in calendar.findall(
                    'dayPeriods/dayPeriodContext/dayPeriodWidth'):
                if day_period_width.attrib['type'] == 'wide':
                    for day_period in day_period_width.findall('dayPeriod'):
                        if 'alt' not in day_period.attrib:
                            periods[day_period.attrib['type']] = text_type(
                                day_period.text)

            date_formats = data.setdefault('date_formats', {})
            for format in calendar.findall('dateFormats'):
                for elem in format.getiterator():
                    if elem.tag == 'dateFormatLength':
                        if 'draft' in elem.attrib and \
                                elem.attrib.get('type') in date_formats:
                            continue
                        try:
                            date_formats[elem.attrib.get('type')] = \
                                dates.parse_pattern(text_type(
                                    elem.findtext('dateFormat/pattern')))
                        except ValueError as e:
                            error(e)
                    elif elem.tag == 'alias':
                        date_formats = Alias(_translate_alias(
                            ['date_formats'], elem.attrib['path'])
                        )

            time_formats = data.setdefault('time_formats', {})
            for format in calendar.findall('timeFormats'):
                for elem in format.getiterator():
                    if elem.tag == 'timeFormatLength':
                        if ('draft' in elem.attrib or 'alt' in elem.attrib) \
                                and elem.attrib.get('type') in time_formats:
                            continue
                        try:
                            time_formats[elem.attrib.get('type')] = \
                                dates.parse_pattern(text_type(
                                    elem.findtext('timeFormat/pattern')))
                        except ValueError as e:
                            error(e)
                    elif elem.tag == 'alias':
                        time_formats = Alias(_translate_alias(
                            ['time_formats'], elem.attrib['path'])
                        )

            datetime_formats = data.setdefault('datetime_formats', {})
            for format in calendar.findall('dateTimeFormats'):
                for elem in format.getiterator():
                    if elem.tag == 'dateTimeFormatLength':
                        if ('draft' in elem.attrib or 'alt' in elem.attrib) \
                                and elem.attrib.get('type') in datetime_formats: