feat: add currency property and option

docs/readthedocs/reference/ecma-intl-locale-options.rst

@@ -38,6 +38,10 @@ Ecma\\Intl\\Locale\\Options
 
         The collation algorithm to set on the locale.
 
+    .. php:attr:: currency: string | null, readonly
+
+        The currency to set on the locale.
+
     .. php:attr:: hourCycle: string | null, readonly
 
         The hour cycle to set on the locale.
@@ -68,6 +72,7 @@ Ecma\\Intl\\Locale\\Options
         :param Stringable | string | null $calendar: The calendar to use with the locale.
         :param Stringable | string | false | null $caseFirst: The case sorting algorithm to use with the locale.
         :param Stringable | string | null $collation: The collation algorithm to use with the locale.
+        :param Stringable | string | null $currency: The currency to set on the locale.
         :param Stringable | string | null $hourCycle: The hour cycle to use with the locale.
         :param Stringable | string | null $language: The language to use with the locale.
         :param Stringable | string | null $numberingSystem: The numbering system to use with the locale.

docs/readthedocs/reference/ecma-intl-locale.rst

@@ -60,6 +60,24 @@ Ecma\\Intl\\Locale
 
         See :php:meth:`Ecma\\Intl\\Locale::getCollations()`.
 
+    .. php:attr:: currencies: string[], readonly
+
+        See :php:meth:`Ecma\\Intl\\Locale::getCurrencies()`.
+
+    .. php:attr:: currency: string | null, readonly
+
+        The ``currency`` property has the currency type for this locale.
+
+        The currency type is the 3-character ISO 4217 currency code.
+        If neither the ``cu`` key of the locale identifier nor the
+        :php:attr:`Ecma\\Intl\\Locale\\Options::$currency` option is set, this
+        value is `null`.
+
+        This property is not defined in ECMA-402 or in the `Intl Locale Info
+        Proposal <https://tc39.es/proposal-intl-locale-info/>`_. Instead, this
+        is unique to the PHP implementation and is inspired by the
+        Intl Locale Info Proposal.
+
     .. php:attr:: hourCycle: string | null, readonly
 
         The ``hourCycle`` property has the hour cycle type for this locale.
@@ -197,11 +215,14 @@ Ecma\\Intl\\Locale
         Returns a list of one or more currency types commonly used for this
         locale.
 
+        If the locale already includes a currency (e.g., ``en-u-cu-eur``) or
+        one was provided via the constructor's ``$options`` parameter, this
+        list will contain only that currency type.
+
         This method is not defined in ECMA-402 or in the `Intl Locale Info
         Proposal <https://tc39.es/proposal-intl-locale-info/>`_ in which other
         similar methods are described. Instead, this is unique to the PHP
-        implementation and draws its inspiration from the Intl Locale Info
-        Proposal.
+        implementation and is inspired by the Intl Locale Info Proposal.
 
     .. php:method:: getHourCycles(): string[]
 

src/common.h

@@ -16,6 +16,7 @@
 #define BCP47_KEYWORD_CALENDAR "ca"
 #define BCP47_KEYWORD_CASE_FIRST "kf"
 #define BCP47_KEYWORD_COLLATION "co"
+#define BCP47_KEYWORD_CURRENCY "cu"
 #define BCP47_KEYWORD_HOUR_CYCLE "hc"
 #define BCP47_KEYWORD_NUMBERING_SYSTEM "nu"
 #define BCP47_KEYWORD_NUMERIC "kn"

src/ecma402/language_tag.cpp

@@ -43,6 +43,10 @@ bool ecma402_isStructurallyValidLanguageTag(const char *tag) {
   return parser.parseUnicodeLocaleId();
 }
 
+bool ecma402_isUnicodeCurrencyType(const char *currency) {
+  return ecma402::isUnicodeCurrencyType(currency);
+}
+
 bool ecma402_isUnicodeLanguageSubtag(const char *language) {
   return ecma402::isUnicodeLanguageSubtag(language);
 }
@@ -77,6 +81,11 @@ bool ecma402_isUnicodeScriptSubtag(const char *script) {
   return ecma402::isUnicodeScriptSubtag(script);
 }
 
+bool ecma402::isUnicodeCurrencyType(const std::string &string) {
+  return string.length() == 3 &&
+         std::all_of(string.cbegin(), string.cend(), util::isAsciiAlpha);
+}
+
 bool ecma402::isUnicodeLanguageSubtag(const std::string &string) {
   auto length = string.length();
   return length >= 2 && length <= 8 && length != 4 &&

src/ecma402/language_tag.h

@@ -29,6 +29,11 @@ extern "C" {
  */
 bool ecma402_isStructurallyValidLanguageTag(const char *tag);
 
+/**
+ * Returns true if the string is a valid Unicode currency type.
+ */
+bool ecma402_isUnicodeCurrencyType(const char *currency);
+
 /**
  * Returns true if the string is a valid Unicode language subtag.
  */
@@ -63,6 +68,18 @@ bool ecma402_isUnicodeScriptSubtag(const char *script);
 
 namespace ecma402 {
 
+/**
+ * Returns true if the string is a valid Unicode language subtag.
+ *
+ * <p>The currency type consists of:</p>
+ *
+ * <blockquote>
+ * Codes consisting of 3 ASCII letters that are or have been valid in ISO 4217,
+ * plus certain additional codes that are or have been in common use.
+ * </blockquote>
+ */
+bool isUnicodeCurrencyType(const std::string &string);
+
 /**
  * Returns true if the string is a valid Unicode language subtag.
  *

src/ecma402/locale.cpp

@@ -67,12 +67,11 @@ int getTimeZonesForLocale(char *localeId, const char **values);
 
 } // namespace
 
-ecma402_locale *
-ecma402_applyLocaleOptions(ecma402_locale *locale, const char *calendar,
-                           const char *caseFirst, const char *collation,
-                           const char *hourCycle, const char *language,
-                           const char *numberingSystem, int numeric,
-                           const char *region, const char *script) {
+ecma402_locale *ecma402_applyLocaleOptions(
+    ecma402_locale *locale, const char *calendar, const char *caseFirst,
+    const char *collation, const char *currency, const char *hourCycle,
+    const char *language, const char *numberingSystem, int numeric,
+    const char *region, const char *script) {
   icu::Locale icuLocale;
   icu::LocaleBuilder icuLocaleBuilder;
   UErrorCode icuStatus = U_ZERO_ERROR;
@@ -98,6 +97,10 @@ ecma402_applyLocaleOptions(ecma402_locale *locale, const char *calendar,
                                              collation);
   }
 
+  if (currency != nullptr) {
+    icuLocaleBuilder.setUnicodeLocaleKeyword(BCP47_KEYWORD_CURRENCY, currency);
+  }
+
   if (hourCycle != nullptr) {
     icuLocaleBuilder.setUnicodeLocaleKeyword(BCP47_KEYWORD_HOUR_CYCLE,
                                              hourCycle);
@@ -261,6 +264,7 @@ void ecma402_freeLocale(ecma402_locale *locale) {
   FREE_PROPERTY(canonical);
   FREE_PROPERTY(caseFirst);
   FREE_PROPERTY(collation);
+  FREE_PROPERTY(currency);
   FREE_PROPERTY(hourCycle);
   FREE_PROPERTY(language);
   FREE_PROPERTY(numberingSystem);
@@ -326,6 +330,70 @@ int ecma402_getCollation(const char *localeId, char *collation,
                          isCanonicalized);
 }
 
+int ecma402_getCurrency(const char *localeId, char *currency,
+                        ecma402_errorStatus *status, bool isCanonicalized) {
+  char *canonicalized;
+  UChar buffer[4];
+  UErrorCode icuStatus = U_ZERO_ERROR;
+  std::string icuValue;
+  int icuValueLength;
+
+  if (localeId == nullptr) {
+    return -1;
+  }
+
+  if (isCanonicalized) {
+    canonicalized = strdup(localeId);
+  } else {
+    canonicalized = (char *)malloc(sizeof(char) * ULOC_FULLNAME_CAPACITY);
+    ecma402_canonicalizeUnicodeLocaleId(localeId, canonicalized, status);
+
+    if (ecma402_hasError(status)) {
+      free(canonicalized);
+      return -1;
+    }
+  }
+
+  // If given a locale like "en-US-u-cu-foobar," ucurr_forLocale() will return
+  // the default currency for the locale (e.g., "USD"), and if given a locale
+  // like "en-US-u-cu-fo," it will return "YES," but we would prefer it to
+  // indicate it couldn't find a default currency, since the user provided one,
+  // so we do this check here to see if the "cu" user-provided value is exactly
+  // 3 alphanumeric characters. If it is not, we return -1.
+  std::string const canonicalStr(canonicalized);
+  free(canonicalized);
+
+  size_t const cuPos = canonicalStr.find("-cu-");
+  if (cuPos != std::string::npos) {
+    size_t const startPos = cuPos + 4;
+    size_t const endPos = canonicalStr.find('-', startPos);
+    size_t const cuLen =
+        (endPos == std::string::npos) ? std::string::npos : endPos - startPos;
+
+    std::string const cuStr = canonicalStr.substr(startPos, cuLen);
+    if (cuStr.length() != 3) {
+      return -1;
+    }
+  } else {
+    // The locale does not specify a currency.
+    return -1;
+  }
+
+  icuValueLength = ucurr_forLocale(canonicalStr.c_str(), buffer, 4, &icuStatus);
+
+  if (U_FAILURE(icuStatus) != U_ZERO_ERROR) {
+    return -1;
+  }
+
+  for (int i = 0; i < icuValueLength; i++) {
+    icuValue.push_back(buffer[i]);
+  }
+
+  memcpy(currency, icuValue.c_str(), icuValue.length() + 1);
+
+  return icuValue.length();
+}
+
 int ecma402_getHourCycle(const char *localeId, char *hourCycle,
                          ecma402_errorStatus *status, bool isCanonicalized) {
   return getKeywordValue(ICU_KEYWORD_HOUR_CYCLE, localeId, hourCycle, status,
@@ -371,6 +439,7 @@ ecma402_locale *ecma402_initEmptyLocale(void) {
   locale->canonical = nullptr;
   locale->caseFirst = nullptr;
   locale->collation = nullptr;
+  locale->currency = nullptr;
   locale->hourCycle = nullptr;
   locale->language = nullptr;
   locale->numberingSystem = nullptr;
@@ -412,6 +481,7 @@ ecma402_locale *ecma402_initLocale(const char *localeId) {
   INIT_PROPERTY(canonical, calendar, ULOC_KEYWORDS_CAPACITY, getCalendar);
   INIT_PROPERTY(canonical, caseFirst, ULOC_KEYWORDS_CAPACITY, getCaseFirst);
   INIT_PROPERTY(canonical, collation, ULOC_KEYWORDS_CAPACITY, getCollation);
+  INIT_PROPERTY(canonical, currency, 4, getCurrency);
   INIT_PROPERTY(canonical, hourCycle, ULOC_KEYWORDS_CAPACITY, getHourCycle);
   INIT_PROPERTY(canonical, language, ULOC_LANG_CAPACITY, getLanguage);
   INIT_PROPERTY(canonical, numberingSystem, ULOC_KEYWORDS_CAPACITY,
@@ -468,8 +538,7 @@ int ecma402_keywordsOfLocale(ecma402_locale *locale, const char *keyword,
 
   canonical = locale->canonical;
 
-  if (strcmp(keyword, ICU_KEYWORD_TIME_ZONE) == 0 ||
-      strcmp(keyword, ICU_KEYWORD_CURRENCY) == 0) {
+  if (strcmp(keyword, ICU_KEYWORD_TIME_ZONE) == 0) {
     // Skip checking for a "preferred" identifier for these keywords.
   } else {
     // Check to see whether the localeId already has the keyword value set on
@@ -483,7 +552,14 @@ int ecma402_keywordsOfLocale(ecma402_locale *locale, const char *keyword,
       return 0;
     }
 
-    if (preferredLength > 0) {
+    // If the keyword is "currency," there's some special handling: it must have
+    // a length of exactly 3, and it must not have a value of "YES" (which
+    // implies the length was actually less than 3 and ICU converted that to a
+    // truthy string "YES").
+    // If the keyword is not "currency," then the length must be greater than 0.
+    if ((strcmp(keyword, ICU_KEYWORD_CURRENCY) == 0 && preferredLength == 3 &&
+         strcasecmp(preferred, "YES") != 0) ||
+        (strcmp(keyword, ICU_KEYWORD_CURRENCY) != 0 && preferredLength > 0)) {
       values[0] = strdup(uloc_toUnicodeLocaleType(keyword, preferred));
       free(preferred);
       return 1;

src/ecma402/locale.h

@@ -53,6 +53,11 @@ typedef struct ecma402_locale {
    */
   char *collation;
 
+  /**
+   * The currency (cu) property of the locale identifier, if available.
+   */
+  char *currency;
+
   /**
    * The hours (hc) property of the locale identifier, if available.
    */
@@ -107,6 +112,7 @@ typedef struct ecma402_locale {
  * @param calendar The calendar (ca) type to set; use NULL to ignore.
  * @param caseFirst The colcasefirst (kf) type to set; use NULL to ignore.
  * @param collation The collation (co) type to set; use NULL to ignore.
+ * @param currency The currency (cu) type to set; use NULL to ignore.
  * @param hourCycle The hours (hc) type to set; use NULL to ignore.
  * @param language The language type to set; use NULL to ignore.
  * @param numberingSystem The numbers (nu) type to set; use NULL to ignore.
@@ -117,9 +123,9 @@ typedef struct ecma402_locale {
 ecma402_locale *
 ecma402_applyLocaleOptions(ecma402_locale *locale, const char *calendar,
                            const char *caseFirst, const char *collation,
-                           const char *hourCycle, const char *language,
-                           const char *numberingSystem, int numeric,
-                           const char *region, const char *script);
+                           const char *currency, const char *hourCycle,
+                           const char *language, const char *numberingSystem,
+                           int numeric, const char *region, const char *script);
 
 /**
  * Canonicalizes a list of locales.
@@ -256,6 +262,9 @@ int ecma402_getCaseFirst(const char *localeId, char *caseFirst,
 int ecma402_getCollation(const char *localeId, char *collation,
                          ecma402_errorStatus *status, bool isCanonicalized);
 
+int ecma402_getCurrency(const char *localeId, char *currency,
+                        ecma402_errorStatus *status, bool isCanonicalized);
+
 /**
  * Returns the value of the hours (hc) keyword for the given locale ID.
  *

src/php/classes/locale.c

@@ -164,6 +164,7 @@ PHP_METHOD(Ecma_Intl_Locale, __construct) {
     SET_PROPERTY_STRING(collation);
     SET_PROPERTY_ARRAY(collations, ECMA402_LOCALE_COLLATION_CAPACITY);
     SET_PROPERTY_ARRAY(currencies, ECMA402_LOCALE_CURRENCY_CAPACITY);
+    SET_PROPERTY_STRING(currency);
     SET_PROPERTY_STRING(hourCycle);
     SET_PROPERTY_ARRAY(hourCycles, ECMA402_LOCALE_HOUR_CYCLE_CAPACITY);
     SET_PROPERTY_STRING(language);
@@ -223,6 +224,7 @@ PHP_METHOD(Ecma_Intl_Locale, jsonSerialize) {
   ADD_TO_JSON(collation);
   ADD_TO_JSON(collations);
   ADD_TO_JSON(currencies);
+  ADD_TO_JSON(currency);
   ADD_TO_JSON(hourCycle);
   ADD_TO_JSON(hourCycles);
   ADD_TO_JSON(language);
@@ -276,6 +278,7 @@ static ecma402_locale *applyOptions(ecma402_locale *locale,
   const char *calendar = getOption(options, "calendar");
   const char *caseFirst = getOption(options, "caseFirst");
   const char *collation = getOption(options, "collation");
+  const char *currency = getOption(options, "currency");
   const char *hourCycle = getOption(options, "hourCycle");
   const char *language = getOption(options, "language");
   const char *numberingSystem = getOption(options, "numberingSystem");
@@ -284,8 +287,8 @@ static ecma402_locale *applyOptions(ecma402_locale *locale,
   const char *script = getOption(options, "script");
 
   return ecma402_applyLocaleOptions(locale, calendar, caseFirst, collation,
-                                    hourCycle, language, numberingSystem,
-                                    numeric, region, script);
+                                    currency, hourCycle, language,
+                                    numberingSystem, numeric, region, script);
 }
 
 static void freeLocaleObj(zend_object *object) {

src/php/classes/locale.stub.php

@@ -92,6 +92,21 @@
          */
         public readonly array $currencies;
 
+        /**
+         * The `currency` property has the currency type for this locale.
+         *
+         * The currency type is the 3-character ISO 4217 currency code. If
+         * neither the `cu` key of the locale identifier nor the `currency`
+         * property of the {@see Locale\Options} is set, this value is `null`.
+         *
+         * This property is not defined in ECMA-402 or in the Intl Locale Info
+         * Proposal. Instead, this is unique to the PHP implementation and is
+         * inspired by the Intl Locale Info Proposal.
+         *
+         * @link https://tc39.es/proposal-intl-locale-info/ Intl Locale Info Proposal
+         */
+        public readonly ?string $currency;
+
         /**
          * The `hourCycle` property has the hour cycle type for this locale.
          *
@@ -264,10 +279,14 @@ public function getCollations(): array
          * Returns a list of one or more currency types commonly used for this
          * locale.
          *
+         * If the locale already includes a currency (e.g., `en-u-cu-eur`) or
+         * one was provided via the constructor's `$options` parameter, this
+         * list will contain only that currency type.
+         *
          * This method is not defined in ECMA-402 or in the Intl Locale Info
          * Proposal in which other similar methods are described. Instead, this
-         * is unique to the PHP implementation and draws its inspiration from
-         * the Intl Locale Info Proposal.
+         * is unique to the PHP implementation and is inspired by the Intl
+         * Locale Info Proposal.
          *
          * @link https://tc39.es/proposal-intl-locale-info/ Intl Locale Info Proposal
          * @link https://github.com/tc39/proposal-intl-locale-info/issues/75 Possible of addition of Intl.Locale.prototype.getCurrencies()?