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libphutil/src/internationalization/PhutilLocale.php
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PhutilLocale.php
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<?php
/**
* Defines a locale for translations.
*
* Examples might include "English (US)" or "Japanese".
*/
abstract class PhutilLocale extends Phobject {
/**
* Get the local identifier code, like "en_US".
*
* @return string Locale identifier code.
*/
abstract public function getLocaleCode();
/**
* Get the human-readable locale name, like "English (US)".
*
* @return string Human-readable locale name.
*/
abstract public function getLocaleName();
/**
* Set a fallback locale which can be used as a default if this locale is
* missing translations.
*
* For locales like "English (Great Britain)", missing translations can be
* sourced from "English (US)".
*
* @return string|null Locale code of fallback locale, or null if there is
* no fallback locale.
*/
public function getFallbackLocaleCode() {
return null;
}
/**
* Select a gender variant for this locale. By default, locales use a simple
* rule with two gender variants, listed in "<male, female>" order.
*
* @param const `PhutilPerson` gender constant.
* @param list<wild> List of variants.
* @return string Variant for use.
*/
public function selectGenderVariant($variant, array $translations) {
if ($variant == PhutilPerson::GENDER_FEMININE) {
return end($translations);
} else {
return reset($translations);
}
}
/**
* Select a plural variant for this locale. By default, locales use a simple
* rule with two plural variants, listed in "<singular, plural>" order.
*
* @param int Plurality of the value.
* @param list<wild> List of variants.
* @return string Variant for use.
*/
public function selectPluralVariant($variant, array $translations) {
if ($variant == 1) {
return reset($translations);
} else {
return end($translations);
}
}
/**
* Flags a locale as silly, like "English (Pirate)".
*
* These locales are fun but disastrously inappropriate for serious
* businesses.
*
* @return bool True if this locale is silly.
*/
public function isSillyLocale() {
return false;
}
/**
* Flags a locale as a testing locale, like "English (US, ALL CAPS)". These
* locales are useful for translation development, but not for normal users.
*
* @return bool True if this is a locale for testing or development.
*/
public function isTestLocale() {
return false;
}
/**
* Indicates that the translator should post-process translations in this
* locale by calling @{method:didTranslateString}.
*
* Doing this incurs a performance penalty, and is not useful for most
* languages. However, it can be used to implement test translations like
* "English (US, ALL CAPS)".
*
* @return bool True to postprocess strings.
*/
public function shouldPostProcessTranslations() {
return false;
}
/**
* Callback for post-processing translations.
*
* By default, this callback is not invoked. To activate it, return `true`
* from @{method:shouldPostProcessTranslations}. Activating this callback
* incurs a performance penalty.
*
* @param string The raw input pattern.
* @param string The selected translation pattern.
* @param list<wild> The raw input arguments.
* @param string The translated string.
* @return string Post-processed translation string.
*/
public function didTranslateString(
$raw_pattern,
$translated_pattern,
array $args,
$result_text) {
return $result_text;
}
/**
* Load all available locales.
*
* @return map<string, PhutilLocale> Map from codes to locale objects.
*/
public static function loadAllLocales() {
static $locales;
if ($locales === null) {
$objects = id(new PhutilClassMapQuery())
->setAncestorClass(__CLASS__)
->execute();
$locale_map = array();
foreach ($objects as $object) {
$locale_code = $object->getLocaleCode();
if (empty($locale_map[$locale_code])) {
$locale_map[$locale_code] = $object;
} else {
throw new Exception(
pht(
'Two subclasses of "%s" ("%s" and "%s") define '.
'locales with the same locale code ("%s"). Each locale must '.
'have a unique locale code.',
__CLASS__,
get_class($object),
get_class($locale_map[$locale_code]),
$locale_code));
}
}
foreach ($locale_map as $locale_code => $locale) {
$fallback_code = $locale->getFallbackLocaleCode();
if ($fallback_code !== null) {
if (empty($locale_map[$fallback_code])) {
throw new Exception(
pht(
'The locale "%s" has an invalid fallback locale code ("%s"). '.
'No locale class exists which defines this locale.',
get_class($locale),
$fallback_code));
}
}
}
foreach ($locale_map as $locale_code => $locale) {
$seen = array($locale_code => get_class($locale));
self::checkLocaleFallback($locale_map, $locale, $seen);
}
$locales = $locale_map;
}
return $locales;
}
/**
* Load a specific locale using a locale code.
*
* @param string Locale code.
* @return PhutilLocale Locale object.
*/
public static function loadLocale($locale_code) {
$all_locales = self::loadAllLocales();
$locale = idx($all_locales, $locale_code);
if (!$locale) {
throw new Exception(
pht(
'There is no locale with the locale code "%s".',
$locale_code));
}
return $locale;
}
/**
* Recursively check locale fallbacks for cycles.
*
* @param map<string, PhutilLocale> Map of locales.
* @param PhutilLocale Current locale.
* @param map<string, string> Map of visited locales.
* @return void
*/
private static function checkLocaleFallback(
array $map,
PhutilLocale $locale,
array $seen) {
$fallback_code = $locale->getFallbackLocaleCode();
if ($fallback_code === null) {
return;
}
if (isset($seen[$fallback_code])) {
$seen[] = get_class($locale);
$seen[] = pht('...');
throw new Exception(
pht(
'Locale "%s" is part of a cycle of locales which fall back on '.
'one another in a loop (%s). Locales which fall back on other '.
'locales must not loop.',
get_class($locale),
implode(' -> ', $seen)));
}
$seen[$fallback_code] = get_class($locale);
self::checkLocaleFallback($map, $map[$fallback_code], $seen);
}
}
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