diff options
Diffstat (limited to 'intl/icu/source/i18n/unicode/unumberformatter.h')
| -rw-r--r-- | intl/icu/source/i18n/unicode/unumberformatter.h | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/unicode/unumberformatter.h b/intl/icu/source/i18n/unicode/unumberformatter.h new file mode 100644 index 0000000000..09fa000b82 --- /dev/null +++ b/intl/icu/source/i18n/unicode/unumberformatter.h @@ -0,0 +1,576 @@ +// © 2018 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html + +#ifndef __UNUMBERFORMATTER_H__ +#define __UNUMBERFORMATTER_H__ + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_FORMATTING + +#include "unicode/parseerr.h" +#include "unicode/unumberoptions.h" +#include "unicode/uformattednumber.h" + + +/** + * \file + * \brief C API: Localized number formatting; not recommended for C++. + * + * This is the C-compatible version of the NumberFormatter API introduced in ICU 60. C++ users should + * include unicode/numberformatter.h and use the proper C++ APIs. + * + * The C API accepts a number skeleton string for specifying the settings for formatting, which covers a + * very large subset of all possible number formatting features. For more information on number skeleton + * strings, see unicode/numberformatter.h. + * + * When using UNumberFormatter, which is treated as immutable, the results are exported to a mutable + * UFormattedNumber object, which you subsequently use for populating your string buffer or iterating over + * the fields. + * + * Example code: + * <pre> + * // Setup: + * UErrorCode ec = U_ZERO_ERROR; + * UNumberFormatter* uformatter = unumf_openForSkeletonAndLocale(u"precision-integer", -1, "en", &ec); + * UFormattedNumber* uresult = unumf_openResult(&ec); + * if (U_FAILURE(ec)) { return; } + * + * // Format a double: + * unumf_formatDouble(uformatter, 5142.3, uresult, &ec); + * if (U_FAILURE(ec)) { return; } + * + * // Export the string to a malloc'd buffer: + * int32_t len = unumf_resultToString(uresult, NULL, 0, &ec); + * // at this point, ec == U_BUFFER_OVERFLOW_ERROR + * ec = U_ZERO_ERROR; + * UChar* buffer = (UChar*) malloc((len+1)*sizeof(UChar)); + * unumf_resultToString(uresult, buffer, len+1, &ec); + * if (U_FAILURE(ec)) { return; } + * // buffer should equal "5,142" + * + * // Cleanup: + * unumf_close(uformatter); + * unumf_closeResult(uresult); + * free(buffer); + * </pre> + * + * If you are a C++ user linking against the C libraries, you can use the LocalPointer versions of these + * APIs. The following example uses LocalPointer with the decimal number and field position APIs: + * + * <pre> + * // Setup: + * LocalUNumberFormatterPointer uformatter(unumf_openForSkeletonAndLocale(u"percent", -1, "en", &ec)); + * LocalUFormattedNumberPointer uresult(unumf_openResult(&ec)); + * if (U_FAILURE(ec)) { return; } + * + * // Format a decimal number: + * unumf_formatDecimal(uformatter.getAlias(), "9.87E-3", -1, uresult.getAlias(), &ec); + * if (U_FAILURE(ec)) { return; } + * + * // Get the location of the percent sign: + * UFieldPosition ufpos = {UNUM_PERCENT_FIELD, 0, 0}; + * unumf_resultNextFieldPosition(uresult.getAlias(), &ufpos, &ec); + * // ufpos should contain beginIndex=7 and endIndex=8 since the string is "0.00987%" + * + * // No need to do any cleanup since we are using LocalPointer. + * </pre> + */ + +/** + * An enum declaring how to resolve conflicts between maximum fraction digits and maximum + * significant digits. + * + * There are two modes, RELAXED and STRICT: + * + * - RELAXED: Relax one of the two constraints (fraction digits or significant digits) in order + * to round the number to a higher level of precision. + * - STRICT: Enforce both constraints, resulting in the number being rounded to a lower + * level of precision. + * + * The default settings for compact notation rounding are Max-Fraction = 0 (round to the nearest + * integer), Max-Significant = 2 (round to 2 significant digits), and priority RELAXED (choose + * the constraint that results in more digits being displayed). + * + * Conflicting *minimum* fraction and significant digits are always resolved in the direction that + * results in more trailing zeros. + * + * Example 1: Consider the number 3.141, with various different settings: + * + * - Max-Fraction = 1: "3.1" + * - Max-Significant = 3: "3.14" + * + * The rounding priority determines how to resolve the conflict when both Max-Fraction and + * Max-Significant are set. With RELAXED, the less-strict setting (the one that causes more digits + * to be displayed) will be used; Max-Significant wins. With STRICT, the more-strict setting (the + * one that causes fewer digits to be displayed) will be used; Max-Fraction wins. + * + * Example 2: Consider the number 8317, with various different settings: + * + * - Max-Fraction = 1: "8317" + * - Max-Significant = 3: "8320" + * + * Here, RELAXED favors Max-Fraction and STRICT favors Max-Significant. Note that this larger + * number caused the two modes to favor the opposite result. + * + * @stable ICU 69 + */ +typedef enum UNumberRoundingPriority { + /** + * Favor greater precision by relaxing one of the rounding constraints. + * + * @stable ICU 69 + */ + UNUM_ROUNDING_PRIORITY_RELAXED, + + /** + * Favor adherence to all rounding constraints by producing lower precision. + * + * @stable ICU 69 + */ + UNUM_ROUNDING_PRIORITY_STRICT, +} UNumberRoundingPriority; + +/** + * An enum declaring how to render units, including currencies. Example outputs when formatting 123 USD and 123 + * meters in <em>en-CA</em>: + * + * <p> + * <ul> + * <li>NARROW*: "$123.00" and "123 m" + * <li>SHORT: "US$ 123.00" and "123 m" + * <li>FULL_NAME: "123.00 US dollars" and "123 meters" + * <li>ISO_CODE: "USD 123.00" and undefined behavior + * <li>HIDDEN: "123.00" and "123" + * </ul> + * + * <p> + * This enum is similar to {@link UMeasureFormatWidth}. + * + * @stable ICU 60 + */ +typedef enum UNumberUnitWidth { + /** + * Print an abbreviated version of the unit name. Similar to SHORT, but always use the shortest available + * abbreviation or symbol. This option can be used when the context hints at the identity of the unit. For more + * information on the difference between NARROW and SHORT, see SHORT. + * + * <p> + * In CLDR, this option corresponds to the "Narrow" format for measure units and the "¤¤¤¤¤" placeholder for + * currencies. + * + * @stable ICU 60 + */ + UNUM_UNIT_WIDTH_NARROW = 0, + + /** + * Print an abbreviated version of the unit name. Similar to NARROW, but use a slightly wider abbreviation or + * symbol when there may be ambiguity. This is the default behavior. + * + * <p> + * For example, in <em>es-US</em>, the SHORT form for Fahrenheit is "{0} °F", but the NARROW form is "{0}°", + * since Fahrenheit is the customary unit for temperature in that locale. + * + * <p> + * In CLDR, this option corresponds to the "Short" format for measure units and the "¤" placeholder for + * currencies. + * + * @stable ICU 60 + */ + UNUM_UNIT_WIDTH_SHORT = 1, + + /** + * Print the full name of the unit, without any abbreviations. + * + * <p> + * In CLDR, this option corresponds to the default format for measure units and the "¤¤¤" placeholder for + * currencies. + * + * @stable ICU 60 + */ + UNUM_UNIT_WIDTH_FULL_NAME = 2, + + /** + * Use the three-digit ISO XXX code in place of the symbol for displaying currencies. The behavior of this + * option is currently undefined for use with measure units. + * + * <p> + * In CLDR, this option corresponds to the "¤¤" placeholder for currencies. + * + * @stable ICU 60 + */ + UNUM_UNIT_WIDTH_ISO_CODE = 3, + + /** + * Use the formal variant of the currency symbol; for example, "NT$" for the New Taiwan + * dollar in zh-TW. + * + * <p> + * Behavior of this option with non-currency units is not defined at this time. + * + * @stable ICU 68 + */ + UNUM_UNIT_WIDTH_FORMAL = 4, + + /** + * Use the alternate variant of the currency symbol; for example, "TL" for the Turkish + * lira (TRY). + * + * <p> + * Behavior of this option with non-currency units is not defined at this time. + * + * @stable ICU 68 + */ + UNUM_UNIT_WIDTH_VARIANT = 5, + + /** + * Format the number according to the specified unit, but do not display the unit. For currencies, apply + * monetary symbols and formats as with SHORT, but omit the currency symbol. For measure units, the behavior is + * equivalent to not specifying the unit at all. + * + * @stable ICU 60 + */ + UNUM_UNIT_WIDTH_HIDDEN = 6, + + // Do not conditionalize the following with #ifndef U_HIDE_INTERNAL_API, + // needed for unconditionalized struct MacroProps + /** + * One more than the highest UNumberUnitWidth value. + * + * @internal ICU 60: The numeric value may change over time; see ICU ticket #12420. + */ + UNUM_UNIT_WIDTH_COUNT = 7 +} UNumberUnitWidth; + +/** + * An enum declaring how to denote positive and negative numbers. Example outputs when formatting + * 123, 0, and -123 in <em>en-US</em>: + * + * <ul> + * <li>AUTO: "123", "0", and "-123" + * <li>ALWAYS: "+123", "+0", and "-123" + * <li>NEVER: "123", "0", and "123" + * <li>ACCOUNTING: "$123", "$0", and "($123)" + * <li>ACCOUNTING_ALWAYS: "+$123", "+$0", and "($123)" + * <li>EXCEPT_ZERO: "+123", "0", and "-123" + * <li>ACCOUNTING_EXCEPT_ZERO: "+$123", "$0", and "($123)" + * </ul> + * + * <p> + * The exact format, including the position and the code point of the sign, differ by locale. + * + * @stable ICU 60 + */ +typedef enum UNumberSignDisplay { + /** + * Show the minus sign on negative numbers, and do not show the sign on positive numbers. This is the default + * behavior. + * + * If using this option, a sign will be displayed on negative zero, including negative numbers + * that round to zero. To hide the sign on negative zero, use the NEGATIVE option. + * + * @stable ICU 60 + */ + UNUM_SIGN_AUTO, + + /** + * Show the minus sign on negative numbers and the plus sign on positive numbers, including zero. + * To hide the sign on zero, see {@link UNUM_SIGN_EXCEPT_ZERO}. + * + * @stable ICU 60 + */ + UNUM_SIGN_ALWAYS, + + /** + * Do not show the sign on positive or negative numbers. + * + * @stable ICU 60 + */ + UNUM_SIGN_NEVER, + + /** + * Use the locale-dependent accounting format on negative numbers, and do not show the sign on positive numbers. + * + * <p> + * The accounting format is defined in CLDR and varies by locale; in many Western locales, the format is a pair + * of parentheses around the number. + * + * <p> + * Note: Since CLDR defines the accounting format in the monetary context only, this option falls back to the + * AUTO sign display strategy when formatting without a currency unit. This limitation may be lifted in the + * future. + * + * @stable ICU 60 + */ + UNUM_SIGN_ACCOUNTING, + + /** + * Use the locale-dependent accounting format on negative numbers, and show the plus sign on + * positive numbers, including zero. For more information on the accounting format, see the + * ACCOUNTING sign display strategy. To hide the sign on zero, see + * {@link UNUM_SIGN_ACCOUNTING_EXCEPT_ZERO}. + * + * @stable ICU 60 + */ + UNUM_SIGN_ACCOUNTING_ALWAYS, + + /** + * Show the minus sign on negative numbers and the plus sign on positive numbers. Do not show a + * sign on zero, numbers that round to zero, or NaN. + * + * @stable ICU 61 + */ + UNUM_SIGN_EXCEPT_ZERO, + + /** + * Use the locale-dependent accounting format on negative numbers, and show the plus sign on + * positive numbers. Do not show a sign on zero, numbers that round to zero, or NaN. For more + * information on the accounting format, see the ACCOUNTING sign display strategy. + * + * @stable ICU 61 + */ + UNUM_SIGN_ACCOUNTING_EXCEPT_ZERO, + + /** + * Same as AUTO, but do not show the sign on negative zero. + * + * @stable ICU 69 + */ + UNUM_SIGN_NEGATIVE, + + /** + * Same as ACCOUNTING, but do not show the sign on negative zero. + * + * @stable ICU 69 + */ + UNUM_SIGN_ACCOUNTING_NEGATIVE, + + // Do not conditionalize the following with #ifndef U_HIDE_INTERNAL_API, + // needed for unconditionalized struct MacroProps + /** + * One more than the highest UNumberSignDisplay value. + * + * @internal ICU 60: The numeric value may change over time; see ICU ticket #12420. + */ + UNUM_SIGN_COUNT = 9, +} UNumberSignDisplay; + +/** + * An enum declaring how to render the decimal separator. + * + * <p> + * <ul> + * <li>UNUM_DECIMAL_SEPARATOR_AUTO: "1", "1.1" + * <li>UNUM_DECIMAL_SEPARATOR_ALWAYS: "1.", "1.1" + * </ul> + * + * @stable ICU 60 + */ +typedef enum UNumberDecimalSeparatorDisplay { + /** + * Show the decimal separator when there are one or more digits to display after the separator, and do not show + * it otherwise. This is the default behavior. + * + * @stable ICU 60 + */ + UNUM_DECIMAL_SEPARATOR_AUTO, + + /** + * Always show the decimal separator, even if there are no digits to display after the separator. + * + * @stable ICU 60 + */ + UNUM_DECIMAL_SEPARATOR_ALWAYS, + + // Do not conditionalize the following with #ifndef U_HIDE_INTERNAL_API, + // needed for unconditionalized struct MacroProps + /** + * One more than the highest UNumberDecimalSeparatorDisplay value. + * + * @internal ICU 60: The numeric value may change over time; see ICU ticket #12420. + */ + UNUM_DECIMAL_SEPARATOR_COUNT +} UNumberDecimalSeparatorDisplay; + +/** + * An enum declaring how to render trailing zeros. + * + * - UNUM_TRAILING_ZERO_AUTO: 0.90, 1.00, 1.10 + * - UNUM_TRAILING_ZERO_HIDE_IF_WHOLE: 0.90, 1, 1.10 + * + * @stable ICU 69 + */ +typedef enum UNumberTrailingZeroDisplay { + /** + * Display trailing zeros according to the settings for minimum fraction and significant digits. + * + * @stable ICU 69 + */ + UNUM_TRAILING_ZERO_AUTO, + + /** + * Same as AUTO, but hide trailing zeros after the decimal separator if they are all zero. + * + * @stable ICU 69 + */ + UNUM_TRAILING_ZERO_HIDE_IF_WHOLE, +} UNumberTrailingZeroDisplay; + +struct UNumberFormatter; +/** + * C-compatible version of icu::number::LocalizedNumberFormatter. + * + * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. + * + * @stable ICU 62 + */ +typedef struct UNumberFormatter UNumberFormatter; + + +/** + * Creates a new UNumberFormatter for the given skeleton string and locale. This is currently the only + * method for creating a new UNumberFormatter. + * + * Objects of type UNumberFormatter returned by this method are threadsafe. + * + * For more details on skeleton strings, see the documentation in numberformatter.h. For more details on + * the usage of this API, see the documentation at the top of unumberformatter.h. + * + * For more information on number skeleton strings, see: + * https://unicode-org.github.io/icu/userguide/format_parse/numbers/skeletons.html + * + * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. + * + * @param skeleton The skeleton string, like u"percent precision-integer" + * @param skeletonLen The number of UChars in the skeleton string, or -1 if it is NUL-terminated. + * @param locale The NUL-terminated locale ID. + * @param ec Set if an error occurs. + * @stable ICU 62 + */ +U_CAPI UNumberFormatter* U_EXPORT2 +unumf_openForSkeletonAndLocale(const UChar* skeleton, int32_t skeletonLen, const char* locale, + UErrorCode* ec); + + +/** + * Like unumf_openForSkeletonAndLocale, but accepts a UParseError, which will be populated with the + * location of a skeleton syntax error if such a syntax error exists. + * + * For more information on number skeleton strings, see: + * https://unicode-org.github.io/icu/userguide/format_parse/numbers/skeletons.html + * + * @param skeleton The skeleton string, like u"percent precision-integer" + * @param skeletonLen The number of UChars in the skeleton string, or -1 if it is NUL-terminated. + * @param locale The NUL-terminated locale ID. + * @param perror A parse error struct populated if an error occurs when parsing. Can be NULL. + * If no error occurs, perror->offset will be set to -1. + * @param ec Set if an error occurs. + * @stable ICU 64 + */ +U_CAPI UNumberFormatter* U_EXPORT2 +unumf_openForSkeletonAndLocaleWithError( + const UChar* skeleton, int32_t skeletonLen, const char* locale, UParseError* perror, UErrorCode* ec); + + + +/** + * Uses a UNumberFormatter to format an integer to a UFormattedNumber. A string, field position, and other + * information can be retrieved from the UFormattedNumber. + * + * The UNumberFormatter can be shared between threads. Each thread should have its own local + * UFormattedNumber, however, for storing the result of the formatting operation. + * + * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. + * + * @param uformatter A formatter object created by unumf_openForSkeletonAndLocale or similar. + * @param value The number to be formatted. + * @param uresult The object that will be mutated to store the result; see unumf_openResult. + * @param ec Set if an error occurs. + * @stable ICU 62 + */ +U_CAPI void U_EXPORT2 +unumf_formatInt(const UNumberFormatter* uformatter, int64_t value, UFormattedNumber* uresult, + UErrorCode* ec); + + +/** + * Uses a UNumberFormatter to format a double to a UFormattedNumber. A string, field position, and other + * information can be retrieved from the UFormattedNumber. + * + * The UNumberFormatter can be shared between threads. Each thread should have its own local + * UFormattedNumber, however, for storing the result of the formatting operation. + * + * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. + * + * @param uformatter A formatter object created by unumf_openForSkeletonAndLocale or similar. + * @param value The number to be formatted. + * @param uresult The object that will be mutated to store the result; see unumf_openResult. + * @param ec Set if an error occurs. + * @stable ICU 62 + */ +U_CAPI void U_EXPORT2 +unumf_formatDouble(const UNumberFormatter* uformatter, double value, UFormattedNumber* uresult, + UErrorCode* ec); + + +/** + * Uses a UNumberFormatter to format a decimal number to a UFormattedNumber. A string, field position, and + * other information can be retrieved from the UFormattedNumber. + * + * The UNumberFormatter can be shared between threads. Each thread should have its own local + * UFormattedNumber, however, for storing the result of the formatting operation. + * + * The syntax of the unformatted number is a "numeric string" as defined in the Decimal Arithmetic + * Specification, available at http://speleotrove.com/decimal + * + * NOTE: This is a C-compatible API; C++ users should build against numberformatter.h instead. + * + * @param uformatter A formatter object created by unumf_openForSkeletonAndLocale or similar. + * @param value The numeric string to be formatted. + * @param valueLen The length of the numeric string, or -1 if it is NUL-terminated. + * @param uresult The object that will be mutated to store the result; see unumf_openResult. + * @param ec Set if an error occurs. + * @stable ICU 62 + */ +U_CAPI void U_EXPORT2 +unumf_formatDecimal(const UNumberFormatter* uformatter, const char* value, int32_t valueLen, + UFormattedNumber* uresult, UErrorCode* ec); + + + +/** + * Releases the UNumberFormatter created by unumf_openForSkeletonAndLocale(). + * + * @param uformatter An object created by unumf_openForSkeletonAndLocale(). + * @stable ICU 62 + */ +U_CAPI void U_EXPORT2 +unumf_close(UNumberFormatter* uformatter); + + + +#if U_SHOW_CPLUSPLUS_API +U_NAMESPACE_BEGIN + +/** + * \class LocalUNumberFormatterPointer + * "Smart pointer" class; closes a UNumberFormatter via unumf_close(). + * For most methods see the LocalPointerBase base class. + * + * Usage: + * <pre> + * LocalUNumberFormatterPointer uformatter(unumf_openForSkeletonAndLocale(...)); + * // no need to explicitly call unumf_close() + * </pre> + * + * @see LocalPointerBase + * @see LocalPointer + * @stable ICU 62 + */ +U_DEFINE_LOCAL_OPEN_POINTER(LocalUNumberFormatterPointer, UNumberFormatter, unumf_close); + +U_NAMESPACE_END +#endif // U_SHOW_CPLUSPLUS_API + +#endif /* #if !UCONFIG_NO_FORMATTING */ +#endif //__UNUMBERFORMATTER_H__ |