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"""Utilities for handling prefix dictionaries""" from .util import U_EMPTY_STRING, U_PLUS from .phonenumberutil import format_number, PhoneNumberFormat _LOCALE_NORMALIZATION_MAP = {"zh_TW": "zh_Hant", "zh_HK": "zh_Hant", "zh_MO": "zh_Hant"} def _may_fall_back_to_english(lang): # Don't fall back to English if the requested language is among the following: # - Chinese # - Japanese # - Korean return lang != "zh" and lang != "ja" and lang != "ko" def _full_locale(lang, script, region): if script is not None: if region is not None: return "%s_%s_%s" % (lang, script, region) else: return "%s_%s" % (lang, script) elif region is not None: return "%s_%s" % (lang, region) else: return lang def _find_lang(langdict, lang, script, region): """Return the entry in the dictionary for the given language information.""" # Check if we should map this to a different locale. full_locale = _full_locale(lang, script, region) if (full_locale in _LOCALE_NORMALIZATION_MAP and _LOCALE_NORMALIZATION_MAP[full_locale] in langdict): return langdict[_LOCALE_NORMALIZATION_MAP[full_locale]] # First look for the full locale if full_locale in langdict: return langdict[full_locale] # Then look for lang, script as a combination if script is not None: lang_script = "%s_%s" % (lang, script) if lang_script in langdict: return langdict[lang_script] # Next look for lang, region as a combination if region is not None: lang_region = "%s_%s" % (lang, region) if lang_region in langdict: return langdict[lang_region] # Fall back to bare language code lookup if lang in langdict: return langdict[lang] # Possibly fall back to english if _may_fall_back_to_english(lang): return langdict.get("en", None) else: return None def _prefix_description_for_number(data, longest_prefix, numobj, lang, script=None, region=None): """Return a text description of a PhoneNumber for the given language. Arguments: data -- Prefix dictionary to lookup up number in. longest_prefix -- Length of the longest key in data. numobj -- The PhoneNumber object for which we want to get a text description. lang -- A 2-letter lowercase ISO 639-1 language code for the language in which the description should be returned (e.g. "en") script -- A 4-letter titlecase (first letter uppercase, rest lowercase) ISO script code as defined in ISO 15924, separated by an underscore (e.g. "Hant") region -- A 2-letter uppercase ISO 3166-1 country code (e.g. "GB") Returns a text description in the given language code, for the given phone number's area, or an empty string if no description is available.""" e164_num = format_number(numobj, PhoneNumberFormat.E164) if not e164_num.startswith(U_PLUS): # pragma no cover # Can only hit this arm if there's an internal error in the rest of # the library raise Exception("Expect E164 number to start with +") for prefix_len in range(longest_prefix, 0, -1): prefix = e164_num[1:(1 + prefix_len)] if prefix in data: # This prefix is present in the geocoding data, as a dictionary # mapping language info to location name. name = _find_lang(data[prefix], lang, script, region) if name is not None: return name else: return U_EMPTY_STRING return U_EMPTY_STRING