icuSources/i18n/unicode/ucurr.h

   1 /*
   2 **********************************************************************
   3 * Copyright (c) 2002-2006, International Business Machines
   4 * Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 */
   7 #ifndef _UCURR_H_
   8 #define _UCURR_H_
   9
  10 #include "unicode/utypes.h"
  11 #include "unicode/uenum.h"
  12
  13 /**
  14  * \file
  15  * \brief C API: Encapsulates information about a currency.
  16  */
  17
  18 #if !UCONFIG_NO_FORMATTING
  19
  20 /**
  21  * The ucurr API encapsulates information about a currency, as defined by
  22  * ISO 4217.  A currency is represented by a 3-character string
  23  * containing its ISO 4217 code.  This API can return various data
  24  * necessary the proper display of a currency:
  25  *
  26  * <ul><li>A display symbol, for a specific locale
  27  * <li>The number of fraction digits to display
  28  * <li>A rounding increment
  29  * </ul>
  30  *
  31  * The <tt>DecimalFormat</tt> class uses these data to display
  32  * currencies.
  33  * @author Alan Liu
  34  * @since ICU 2.2
  35  */
  36
  37 /**
  38  * Finds a currency code for the given locale.
  39  * @param locale the locale for which to retrieve a currency code.
  40  *               Currency can be specified by the "currency" keyword
  41  *               in which case it overrides the default currency code
  42  * @param buff   fill in buffer. Can be NULL for preflighting.
  43  * @param buffCapacity capacity of the fill in buffer. Can be 0 for
  44  *               preflighting. If it is non-zero, the buff parameter
  45  *               must not be NULL.
  46  * @param ec error code
  47  * @return length of the currency string. It should always be 3. If 0,
  48  *                currency couldn't be found or the input values are
  49  *                invalid.
  50  * @stable ICU 2.8
  51  */
  52 U_STABLE int32_t U_EXPORT2
  53 ucurr_forLocale(const char* locale,
  54                 UChar* buff,
  55                 int32_t buffCapacity,
  56                 UErrorCode* ec);
  57
  58 /**
  59  * Selector constants for ucurr_getName().
  60  *
  61  * @see ucurr_getName
  62  * @stable ICU 2.6
  63  */
  64 typedef enum UCurrNameStyle {
  65     /**
  66      * Selector for ucurr_getName indicating a symbolic name for a
  67      * currency, such as "$" for USD.
  68      * @stable ICU 2.6
  69      */
  70     UCURR_SYMBOL_NAME,
  71
  72     /**
  73      * Selector for ucurr_getName indicating the long name for a
  74      * currency, such as "US Dollar" for USD.
  75      * @stable ICU 2.6
  76      */
  77     UCURR_LONG_NAME
  78 } UCurrNameStyle;
  79
  80 #if !UCONFIG_NO_SERVICE
  81 /**
  82  * @stable ICU 2.6
  83  */
  84 typedef const void* UCurrRegistryKey;
  85
  86 /**
  87  * Register an (existing) ISO 4217 currency code for the given locale.
  88  * Only the country code and the two variants EURO and PRE_EURO are
  89  * recognized.
  90  * @param isoCode the three-letter ISO 4217 currency code
  91  * @param locale  the locale for which to register this currency code
  92  * @param status the in/out status code
  93  * @return a registry key that can be used to unregister this currency code, or NULL
  94  * if there was an error.
  95  * @stable ICU 2.6
  96  */
  97 U_STABLE UCurrRegistryKey U_EXPORT2
  98 ucurr_register(const UChar* isoCode,
  99                    const char* locale,
 100                    UErrorCode* status);
 101 /**
 102  * Unregister the previously-registered currency definitions using the
 103  * URegistryKey returned from ucurr_register.  Key becomes invalid after
 104  * a successful call and should not be used again.  Any currency
 105  * that might have been hidden by the original ucurr_register call is
 106  * restored.
 107  * @param key the registry key returned by a previous call to ucurr_register
 108  * @param status the in/out status code, no special meanings are assigned
 109  * @return TRUE if the currency for this key was successfully unregistered
 110  * @stable ICU 2.6
 111  */
 112 U_STABLE UBool U_EXPORT2
 113 ucurr_unregister(UCurrRegistryKey key, UErrorCode* status);
 114 #endif /* UCONFIG_NO_SERVICE */
 115
 116 /**
 117  * Returns the display name for the given currency in the
 118  * given locale.  For example, the display name for the USD
 119  * currency object in the en_US locale is "$".
 120  * @param currency null-terminated 3-letter ISO 4217 code
 121  * @param locale locale in which to display currency
 122  * @param nameStyle selector for which kind of name to return
 123  * @param isChoiceFormat fill-in set to TRUE if the returned value
 124  * is a ChoiceFormat pattern; otherwise it is a static string
 125  * @param len fill-in parameter to receive length of result
 126  * @param ec error code
 127  * @return pointer to display string of 'len' UChars.  If the resource
 128  * data contains no entry for 'currency', then 'currency' itself is
 129  * returned.  If *isChoiceFormat is TRUE, then the result is a
 130  * ChoiceFormat pattern.  Otherwise it is a static string.
 131  * @stable ICU 2.6
 132  */
 133 U_STABLE const UChar* U_EXPORT2
 134 ucurr_getName(const UChar* currency,
 135               const char* locale,
 136               UCurrNameStyle nameStyle,
 137               UBool* isChoiceFormat,
 138               int32_t* len,
 139               UErrorCode* ec);
 140
 141 /**
 142  * Returns the number of the number of fraction digits that should
 143  * be displayed for the given currency.
 144  * @param currency null-terminated 3-letter ISO 4217 code
 145  * @param ec input-output error code
 146  * @return a non-negative number of fraction digits to be
 147  * displayed, or 0 if there is an error
 148  * @stable ICU 3.0
 149  */
 150 U_STABLE int32_t U_EXPORT2
 151 ucurr_getDefaultFractionDigits(const UChar* currency,
 152                                UErrorCode* ec);
 153
 154 /**
 155  * Returns the rounding increment for the given currency, or 0.0 if no
 156  * rounding is done by the currency.
 157  * @param currency null-terminated 3-letter ISO 4217 code
 158  * @param ec input-output error code
 159  * @return the non-negative rounding increment, or 0.0 if none,
 160  * or 0.0 if there is an error
 161  * @stable ICU 3.0
 162  */
 163 U_STABLE double U_EXPORT2
 164 ucurr_getRoundingIncrement(const UChar* currency,
 165                            UErrorCode* ec);
 166
 167 /**
 168  * Selector constants for ucurr_openCurrencies().
 169  *
 170  * @see ucurr_openCurrencies
 171  * @stable ICU 3.2
 172  */
 173 typedef enum UCurrCurrencyType {
 174     /**
 175      * Select all ISO-4217 currency codes.
 176      * @stable ICU 3.2
 177      */
 178     UCURR_ALL = INT32_MAX,
 179     /**
 180      * Select only ISO-4217 commonly used currency codes.
 181      * These currencies can be found in common use, and they usually have
 182      * bank notes or coins associated with the currency code.
 183      * This does not include fund codes, precious metals and other
 184      * various ISO-4217 codes limited to special financial products.
 185      * @stable ICU 3.2
 186      */
 187     UCURR_COMMON = 1,
 188     /**
 189      * Select ISO-4217 uncommon currency codes.
 190      * These codes respresent fund codes, precious metals and other
 191      * various ISO-4217 codes limited to special financial products.
 192      * A fund code is a monetary resource associated with a currency.
 193      * @stable ICU 3.2
 194      */
 195     UCURR_UNCOMMON = 2,
 196     /**
 197      * Select only deprecated ISO-4217 codes.
 198      * These codes are no longer in general public use.
 199      * @stable ICU 3.2
 200      */
 201     UCURR_DEPRECATED = 4,
 202     /**
 203      * Select only non-deprecated ISO-4217 codes.
 204      * These codes are in general public use.
 205      * @stable ICU 3.2
 206      */
 207     UCURR_NON_DEPRECATED = 8
 208 } UCurrCurrencyType;
 209
 210 /**
 211  * Provides a UEnumeration object for listing ISO-4217 codes.
 212  * @param currType You can use one of several UCurrCurrencyType values for this
 213  *      variable. You can also | (or) them together to get a specific list of
 214  *      currencies. Most people will want to use the (UCURR_CURRENCY|UCURR_NON_DEPRECATED) value to
 215  *      get a list of current currencies.
 216  * @param pErrorCode Error code
 217  * @stable ICU 3.2
 218  */
 219 U_STABLE UEnumeration * U_EXPORT2
 220 ucurr_openISOCurrencies(uint32_t currType, UErrorCode *pErrorCode);
 221
 222
 223 #ifdef XP_CPLUSPLUS
 224 #include "unicode/unistr.h"
 225 #include "unicode/parsepos.h"
 226 U_NAMESPACE_BEGIN
 227
 228 /**
 229  * Attempt to parse the given string as a currency, either as a
 230  * display name in the given locale, or as a 3-letter ISO 4217
 231  * code.  If multiple display names match, then the longest one is
 232  * selected.  If both a display name and a 3-letter ISO code
 233  * match, then the display name is preferred, unless it's length
 234  * is less than 3.
 235  *
 236  * @param locale the locale of the display names to match
 237  * @param text the text to parse
 238  * @param pos input-output position; on input, the position within
 239  * text to match; must have 0 <= pos.getIndex() < text.length();
 240  * on output, the position after the last matched character. If
 241  * the parse fails, the position in unchanged upon output.
 242  * @return the ISO 4217 code, as a string, of the best match, or
 243  * null if there is no match
 244  *
 245  * @internal
 246  */
 247 U_INTERNAL void
 248 uprv_parseCurrency(const char* locale,
 249                    const UnicodeString& text,
 250                    ParsePosition& pos,
 251                    UChar* result,
 252                    UErrorCode& ec);
 253
 254 U_NAMESPACE_END
 255 #endif
 256
 257 #endif /* #if !UCONFIG_NO_FORMATTING */
 258
 259 #endif