// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ***************************************************************************************** * Copyright (C) 2016, International Business Machines * Corporation and others. All Rights Reserved. ***************************************************************************************** */ #ifndef URELDATEFMT_H #define URELDATEFMT_H #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING #include "unicode/unum.h" #include "unicode/udisplaycontext.h" #include "unicode/uformattedvalue.h" #if U_SHOW_CPLUSPLUS_API #include "unicode/localpointer.h" #endif // U_SHOW_CPLUSPLUS_API /** * \file * \brief C API: URelativeDateTimeFormatter, relative date formatting of unit + numeric offset. * * Provides simple formatting of relative dates, in two ways * <ul> * <li>relative dates with a quantity e.g "in 5 days"</li> * <li>relative dates without a quantity e.g "next Tuesday"</li> * </ul> * <p> * This does not provide compound formatting for multiple units, * other than the ability to combine a time string with a relative date, * as in "next Tuesday at 3:45 PM". It also does not provide support * for determining which unit to use, such as deciding between "in 7 days" * and "in 1 week". * * @stable ICU 57 */ /** * The formatting style * @stable ICU 54 */ UDateRelativeDateTimeFormatterStyle; /** * Represents the unit for formatting a relative date. e.g "in 5 days" * or "next year" * @stable ICU 57 */ URelativeDateTimeUnit; /** * FieldPosition and UFieldPosition selectors for format fields * defined by RelativeDateTimeFormatter. * @stable ICU 64 */ URelativeDateTimeFormatterField; /** * Opaque URelativeDateTimeFormatter object for use in C programs. * @stable ICU 57 */ struct URelativeDateTimeFormatter; URelativeDateTimeFormatter; /**< C typedef for struct URelativeDateTimeFormatter. @stable ICU 57 */ /** * Open a new URelativeDateTimeFormatter object for a given locale using the * specified width and capitalizationContext, along with a number formatter * (if desired) to override the default formatter that would be used for * display of numeric field offsets. The default formatter typically rounds * toward 0 and has a minimum of 0 fraction digits and a maximum of 3 * fraction digits (i.e. it will show as many decimal places as necessary * up to 3, without showing trailing 0s). * * @param locale * The locale * @param nfToAdopt * A number formatter to set for this URelativeDateTimeFormatter * object (instead of the default decimal formatter). Ownership of * this UNumberFormat object will pass to the URelativeDateTimeFormatter * object (the URelativeDateTimeFormatter adopts the UNumberFormat), * which becomes responsible for closing it. If the caller wishes to * retain ownership of the UNumberFormat object, the caller must clone * it (with unum_clone) and pass the clone to ureldatefmt_open. May be * NULL to use the default decimal formatter. * @param width * The width - wide, short, narrow, etc. * @param capitalizationContext * A value from UDisplayContext that pertains to capitalization, e.g. * UDISPCTX_CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE. * @param status * A pointer to a UErrorCode to receive any errors. * @return * A pointer to a URelativeDateTimeFormatter object for the specified locale, * or NULL if an error occurred. * @stable ICU 57 */ U_CAPI URelativeDateTimeFormatter* U_EXPORT2 ureldatefmt_open( const char* locale, UNumberFormat* nfToAdopt, UDateRelativeDateTimeFormatterStyle width, UDisplayContext capitalizationContext, UErrorCode* status ); /** * Close a URelativeDateTimeFormatter object. Once closed it may no longer be used. * @param reldatefmt * The URelativeDateTimeFormatter object to close. * @stable ICU 57 */ U_CAPI void U_EXPORT2 ureldatefmt_close(URelativeDateTimeFormatter *reldatefmt); struct UFormattedRelativeDateTime; /** * Opaque struct to contain the results of a URelativeDateTimeFormatter operation. * @stable ICU 64 */ UFormattedRelativeDateTime; /** * Creates an object to hold the result of a URelativeDateTimeFormatter * operation. The object can be used repeatedly; it is cleared whenever * passed to a format function. * * @param ec Set if an error occurs. * @return A pointer needing ownership. * @stable ICU 64 */ U_CAPI UFormattedRelativeDateTime* U_EXPORT2 ureldatefmt_openResult(UErrorCode* ec); /** * Returns a representation of a UFormattedRelativeDateTime as a UFormattedValue, * which can be subsequently passed to any API requiring that type. * * The returned object is owned by the UFormattedRelativeDateTime and is valid * only as long as the UFormattedRelativeDateTime is present and unchanged in memory. * * You can think of this method as a cast between types. * * @param ufrdt The object containing the formatted string. * @param ec Set if an error occurs. * @return A UFormattedValue owned by the input object. * @stable ICU 64 */ U_CAPI const UFormattedValue* U_EXPORT2 ureldatefmt_resultAsValue(const UFormattedRelativeDateTime* ufrdt, UErrorCode* ec); /** * Releases the UFormattedRelativeDateTime created by ureldatefmt_openResult. * * @param ufrdt The object to release. * @stable ICU 64 */ U_CAPI void U_EXPORT2 ureldatefmt_closeResult(UFormattedRelativeDateTime* ufrdt); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalURelativeDateTimeFormatterPointer * "Smart pointer" class, closes a URelativeDateTimeFormatter via ureldatefmt_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 57 */ U_DEFINE_LOCAL_OPEN_POINTER(…); /** * \class LocalUFormattedRelativeDateTimePointer * "Smart pointer" class, closes a UFormattedRelativeDateTime via ureldatefmt_closeResult(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 64 */ U_DEFINE_LOCAL_OPEN_POINTER(…); U_NAMESPACE_END #endif /** * Format a combination of URelativeDateTimeUnit and numeric * offset using a numeric style, e.g. "1 week ago", "in 1 week", * "5 weeks ago", "in 5 weeks". * * @param reldatefmt * The URelativeDateTimeFormatter object specifying the * format conventions. * @param offset * The signed offset for the specified unit. This will * be formatted according to this object's UNumberFormat * object. * @param unit * The unit to use when formatting the relative * date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY. * @param result * A pointer to a buffer to receive the formatted result. * @param resultCapacity * The maximum size of result. * @param status * A pointer to a UErrorCode to receive any errors. In * case of error status, the contents of result are * undefined. * @return * The length of the formatted result; may be greater * than resultCapacity, in which case an error is returned. * @stable ICU 57 */ U_CAPI int32_t U_EXPORT2 ureldatefmt_formatNumeric( const URelativeDateTimeFormatter* reldatefmt, double offset, URelativeDateTimeUnit unit, UChar* result, int32_t resultCapacity, UErrorCode* status); /** * Format a combination of URelativeDateTimeUnit and numeric * offset using a numeric style, e.g. "1 week ago", "in 1 week", * "5 weeks ago", "in 5 weeks". * * @param reldatefmt * The URelativeDateTimeFormatter object specifying the * format conventions. * @param offset * The signed offset for the specified unit. This will * be formatted according to this object's UNumberFormat * object. * @param unit * The unit to use when formatting the relative * date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY. * @param result * A pointer to a UFormattedRelativeDateTime to populate. * @param status * A pointer to a UErrorCode to receive any errors. In * case of error status, the contents of result are * undefined. * @stable ICU 64 */ U_CAPI void U_EXPORT2 ureldatefmt_formatNumericToResult( const URelativeDateTimeFormatter* reldatefmt, double offset, URelativeDateTimeUnit unit, UFormattedRelativeDateTime* result, UErrorCode* status); /** * Format a combination of URelativeDateTimeUnit and numeric offset * using a text style if possible, e.g. "last week", "this week", * "next week", "yesterday", "tomorrow". Falls back to numeric * style if no appropriate text term is available for the specified * offset in the object's locale. * * @param reldatefmt * The URelativeDateTimeFormatter object specifying the * format conventions. * @param offset * The signed offset for the specified unit. * @param unit * The unit to use when formatting the relative * date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY. * @param result * A pointer to a buffer to receive the formatted result. * @param resultCapacity * The maximum size of result. * @param status * A pointer to a UErrorCode to receive any errors. In * case of error status, the contents of result are * undefined. * @return * The length of the formatted result; may be greater * than resultCapacity, in which case an error is returned. * @stable ICU 57 */ U_CAPI int32_t U_EXPORT2 ureldatefmt_format( const URelativeDateTimeFormatter* reldatefmt, double offset, URelativeDateTimeUnit unit, UChar* result, int32_t resultCapacity, UErrorCode* status); /** * Format a combination of URelativeDateTimeUnit and numeric offset * using a text style if possible, e.g. "last week", "this week", * "next week", "yesterday", "tomorrow". Falls back to numeric * style if no appropriate text term is available for the specified * offset in the object's locale. * * This method populates a UFormattedRelativeDateTime, which exposes more * information than the string populated by format(). * * @param reldatefmt * The URelativeDateTimeFormatter object specifying the * format conventions. * @param offset * The signed offset for the specified unit. * @param unit * The unit to use when formatting the relative * date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY. * @param result * A pointer to a UFormattedRelativeDateTime to populate. * @param status * A pointer to a UErrorCode to receive any errors. In * case of error status, the contents of result are * undefined. * @stable ICU 64 */ U_CAPI void U_EXPORT2 ureldatefmt_formatToResult( const URelativeDateTimeFormatter* reldatefmt, double offset, URelativeDateTimeUnit unit, UFormattedRelativeDateTime* result, UErrorCode* status); /** * Combines a relative date string and a time string in this object's * locale. This is done with the same date-time separator used for the * default calendar in this locale to produce a result such as * "yesterday at 3:45 PM". * * @param reldatefmt * The URelativeDateTimeFormatter object specifying the format conventions. * @param relativeDateString * The relative date string. * @param relativeDateStringLen * The length of relativeDateString; may be -1 if relativeDateString * is zero-terminated. * @param timeString * The time string. * @param timeStringLen * The length of timeString; may be -1 if timeString is zero-terminated. * @param result * A pointer to a buffer to receive the formatted result. * @param resultCapacity * The maximum size of result. * @param status * A pointer to a UErrorCode to receive any errors. In case of error status, * the contents of result are undefined. * @return * The length of the formatted result; may be greater than resultCapacity, * in which case an error is returned. * @stable ICU 57 */ U_CAPI int32_t U_EXPORT2 ureldatefmt_combineDateAndTime( const URelativeDateTimeFormatter* reldatefmt, const UChar * relativeDateString, int32_t relativeDateStringLen, const UChar * timeString, int32_t timeStringLen, UChar* result, int32_t resultCapacity, UErrorCode* status ); #endif /* !UCONFIG_NO_FORMATTING */ #endif
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