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Editing: uformattednumber.h
// © 2022 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html #ifndef __UFORMATTEDNUMBER_H__ #define __UFORMATTEDNUMBER_H__ #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING #include "unicode/ufieldpositer.h" #include "unicode/uformattedvalue.h" #include "unicode/umisc.h" /** * \file * \brief C API: Formatted number result from various number formatting functions. * * Create a `UFormattedNumber` to hold the result of a number formatting operation. The same * `UFormattedNumber` can be reused multiple times. * * <pre> * LocalUFormattedNumberPointer uresult(unumf_openResult(status)); * * // pass uresult.getAlias() to your number formatter * * int32_t length; * const UChar* s = ufmtval_getString(unumf_resultAsValue(uresult.getAlias(), status), &length, status)); * * // The string result is in `s` with the given `length` (it is also NUL-terminated). * </pre> */ struct UFormattedNumber; /** * C-compatible version of icu::number::FormattedNumber. * * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. * * @stable ICU 62 */ typedef struct UFormattedNumber UFormattedNumber; /** * Creates an object to hold the result of a UNumberFormatter * operation. The object can be used repeatedly; it is cleared whenever * passed to a format function. * * @param ec Set if an error occurs. * @stable ICU 62 */ U_CAPI UFormattedNumber* U_EXPORT2 unumf_openResult(UErrorCode* ec); /** * Returns a representation of a UFormattedNumber as a UFormattedValue, * which can be subsequently passed to any API requiring that type. * * The returned object is owned by the UFormattedNumber and is valid * only as long as the UFormattedNumber is present and unchanged in memory. * * You can think of this method as a cast between types. * * @param uresult 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 unumf_resultAsValue(const UFormattedNumber* uresult, UErrorCode* ec); /** * Extracts the result number string out of a UFormattedNumber to a UChar buffer if possible. * If bufferCapacity is greater than the required length, a terminating NUL is written. * If bufferCapacity is less than the required length, an error code is set. * * Also see ufmtval_getString, which returns a NUL-terminated string: * * int32_t len; * const UChar* str = ufmtval_getString(unumf_resultAsValue(uresult, &ec), &len, &ec); * * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. * * @param uresult The object containing the formatted number. * @param buffer Where to save the string output. * @param bufferCapacity The number of UChars available in the buffer. * @param ec Set if an error occurs. * @return The required length. * @stable ICU 62 */ U_CAPI int32_t U_EXPORT2 unumf_resultToString(const UFormattedNumber* uresult, UChar* buffer, int32_t bufferCapacity, UErrorCode* ec); /** * Determines the start and end indices of the next occurrence of the given <em>field</em> in the * output string. This allows you to determine the locations of, for example, the integer part, * fraction part, or symbols. * * This is a simpler but less powerful alternative to {@link ufmtval_nextPosition}. * * If a field occurs just once, calling this method will find that occurrence and return it. If a * field occurs multiple times, this method may be called repeatedly with the following pattern: * * <pre> * UFieldPosition ufpos = {UNUM_GROUPING_SEPARATOR_FIELD, 0, 0}; * while (unumf_resultNextFieldPosition(uresult, ufpos, &ec)) { * // do something with ufpos. * } * </pre> * * This method is useful if you know which field to query. If you want all available field position * information, use unumf_resultGetAllFieldPositions(). * * NOTE: All fields of the UFieldPosition must be initialized before calling this method. * * @param uresult The object containing the formatted number. * @param ufpos * Input+output variable. On input, the "field" property determines which field to look up, * and the "endIndex" property determines where to begin the search. On output, the * "beginIndex" field is set to the beginning of the first occurrence of the field after the * input "endIndex", and "endIndex" is set to the end of that occurrence of the field * (exclusive index). If a field position is not found, the FieldPosition is not changed and * the method returns false. * @param ec Set if an error occurs. * @stable ICU 62 */ U_CAPI UBool U_EXPORT2 unumf_resultNextFieldPosition(const UFormattedNumber* uresult, UFieldPosition* ufpos, UErrorCode* ec); /** * Populates the given iterator with all fields in the formatted output string. This allows you to * determine the locations of the integer part, fraction part, and sign. * * This is an alternative to the more powerful {@link ufmtval_nextPosition} API. * * If you need information on only one field, use {@link ufmtval_nextPosition} or * {@link unumf_resultNextFieldPosition}. * * @param uresult The object containing the formatted number. * @param ufpositer * A pointer to a UFieldPositionIterator created by {@link #ufieldpositer_open}. Iteration * information already present in the UFieldPositionIterator is deleted, and the iterator is reset * to apply to the fields in the formatted string created by this function call. The field values * and indexes returned by {@link #ufieldpositer_next} represent fields denoted by * the UNumberFormatFields enum. Fields are not returned in a guaranteed order. Fields cannot * overlap, but they may nest. For example, 1234 could format as "1,234" which might consist of a * grouping separator field for ',' and an integer field encompassing the entire string. * @param ec Set if an error occurs. * @stable ICU 62 */ U_CAPI void U_EXPORT2 unumf_resultGetAllFieldPositions(const UFormattedNumber* uresult, UFieldPositionIterator* ufpositer, UErrorCode* ec); /** * Extracts the formatted number as a "numeric string" conforming to the * syntax defined in the Decimal Arithmetic Specification, available at * http://speleotrove.com/decimal * * This endpoint is useful for obtaining the exact number being printed * after scaling and rounding have been applied by the number formatter. * * @param uresult The input object containing the formatted number. * @param dest the 8-bit char buffer into which the decimal number is placed * @param destCapacity The size, in chars, of the destination buffer. May be zero * for precomputing the required size. * @param ec receives any error status. * If U_BUFFER_OVERFLOW_ERROR: Returns number of chars for * preflighting. * @return Number of chars in the data. Does not include a trailing NUL. * @stable ICU 68 */ U_CAPI int32_t U_EXPORT2 unumf_resultToDecimalNumber( const UFormattedNumber* uresult, char* dest, int32_t destCapacity, UErrorCode* ec); /** * Releases the UFormattedNumber created by unumf_openResult(). * * @param uresult An object created by unumf_openResult(). * @stable ICU 62 */ U_CAPI void U_EXPORT2 unumf_closeResult(UFormattedNumber* uresult); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUFormattedNumberPointer * "Smart pointer" class; closes a UFormattedNumber via unumf_closeResult(). * For most methods see the LocalPointerBase base class. * * Usage: * <pre> * LocalUFormattedNumberPointer uformatter(unumf_openResult(...)); * // no need to explicitly call unumf_closeResult() * </pre> * * @see LocalPointerBase * @see LocalPointer * @stable ICU 62 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUFormattedNumberPointer, UFormattedNumber, unumf_closeResult); U_NAMESPACE_END #endif // U_SHOW_CPLUSPLUS_API #endif /* #if !UCONFIG_NO_FORMATTING */ #endif //__UFORMATTEDNUMBER_H__
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