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// © 2017 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
#ifndef __NUMBERFORMATTER_H__
#define __NUMBERFORMATTER_H__
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
#if !UCONFIG_NO_FORMATTING
#include "unicode/appendable.h"
#include "unicode/bytestream.h"
#include "unicode/currunit.h"
#include "unicode/dcfmtsym.h"
#include "unicode/fieldpos.h"
#include "unicode/formattedvalue.h"
#include "unicode/fpositer.h"
#include "unicode/measunit.h"
#include "unicode/nounit.h"
#include "unicode/parseerr.h"
#include "unicode/plurrule.h"
#include "unicode/ucurr.h"
#include "unicode/unum.h"
#include "unicode/unumberformatter.h"
#include "unicode/uobject.h"
/**
* \file
* \brief C++ API: Library for localized number formatting introduced in ICU 60.
*
* This library was introduced in ICU 60 to simplify the process of formatting localized number strings.
* Basic usage examples:
*
* <pre>
* // Most basic usage:
* NumberFormatter::withLocale(...).format(123).toString(); // 1,234 in en-US
*
* // Custom notation, unit, and rounding precision:
* NumberFormatter::with()
* .notation(Notation::compactShort())
* .unit(CurrencyUnit("EUR", status))
* .precision(Precision::maxDigits(2))
* .locale(...)
* .format(1234)
* .toString(); // €1.2K in en-US
*
* // Create a formatter in a singleton by value for use later:
* static const LocalizedNumberFormatter formatter = NumberFormatter::withLocale(...)
* .unit(NoUnit::percent())
* .precision(Precision::fixedFraction(3));
* formatter.format(5.9831).toString(); // 5.983% in en-US
*
* // Create a "template" in a singleton unique_ptr but without setting a locale until the call site:
* std::unique_ptr<UnlocalizedNumberFormatter> template = NumberFormatter::with()
* .sign(UNumberSignDisplay::UNUM_SIGN_ALWAYS)
* .unit(MeasureUnit::getMeter())
* .unitWidth(UNumberUnitWidth::UNUM_UNIT_WIDTH_FULL_NAME)
* .clone();
* template->locale(...).format(1234).toString(); // +1,234 meters in en-US
* </pre>
*
* <p>
* This API offers more features than DecimalFormat and is geared toward new users of ICU.
*
* <p>
* NumberFormatter instances (i.e., LocalizedNumberFormatter and UnlocalizedNumberFormatter)
* are immutable and thread safe. This means that invoking a configuration method has no
* effect on the receiving instance; you must store and use the new number formatter instance it returns instead.
*
* <pre>
* UnlocalizedNumberFormatter formatter = UnlocalizedNumberFormatter::with().notation(Notation::scientific());
* formatter.precision(Precision.maxFraction(2)); // does nothing!
* formatter.locale(Locale.getEnglish()).format(9.8765).toString(); // prints "9.8765E0", not "9.88E0"
* </pre>
*
* <p>
* This API is based on the <em>fluent</em> design pattern popularized by libraries such as Google's Guava. For
* extensive details on the design of this API, read <a href="https://goo.gl/szi5VB">the design doc</a>.
*
* @author Shane Carr
*/
U_NAMESPACE_BEGIN
// Forward declarations:
class IFixedDecimal;
class FieldPositionIteratorHandler;
class FormattedStringBuilder;
namespace numparse {
namespace impl {
// Forward declarations:
class NumberParserImpl;
class MultiplierParseHandler;
}
}
namespace number { // icu::number
// Forward declarations:
class UnlocalizedNumberFormatter;
class LocalizedNumberFormatter;
class FormattedNumber;
class Notation;
class ScientificNotation;
class Precision;
class FractionPrecision;
class CurrencyPrecision;
class IncrementPrecision;
class IntegerWidth;
namespace impl {
// can't be #ifndef U_HIDE_INTERNAL_API; referenced throughout this file in public classes
/**
* Datatype for minimum/maximum fraction digits. Must be able to hold kMaxIntFracSig.
*
* @internal
*/
typedef int16_t digits_t;
// can't be #ifndef U_HIDE_INTERNAL_API; needed for struct initialization
/**
* Use a default threshold of 3. This means that the third time .format() is called, the data structures get built
* using the "safe" code path. The first two calls to .format() will trigger the unsafe code path.
*
* @internal
*/
static constexpr int32_t kInternalDefaultThreshold = 3;
// Forward declarations:
class Padder;
struct MacroProps;
struct MicroProps;
class DecimalQuantity;
class UFormattedNumberData;
class NumberFormatterImpl;
struct ParsedPatternInfo;
class ScientificModifier;
class MultiplierProducer;
class RoundingImpl;
class ScientificHandler;
class Modifier;
class AffixPatternProvider;
class NumberPropertyMapper;
struct DecimalFormatProperties;
class MultiplierFormatHandler;
class CurrencySymbols;
class GeneratorHelpers;
class DecNum;
class NumberRangeFormatterImpl;
struct RangeMacroProps;
struct UFormattedNumberImpl;
/**
* Used for NumberRangeFormatter and implemented in numrange_fluent.cpp.
* Declared here so it can be friended.
*
* @internal
*/
void touchRangeLocales(impl::RangeMacroProps& macros);
} // namespace impl
/**
* Extra name reserved in case it is needed in the future.
*
* @stable ICU 63
*/
typedef Notation CompactNotation;
/**
* Extra name reserved in case it is needed in the future.
*
* @stable ICU 63
*/
typedef Notation SimpleNotation;
/**
* A class that defines the notation style to be used when formatting numbers in NumberFormatter.
*
* @stable ICU 60
*/
class U_I18N_API Notation : public UMemory {
public:
/**
* Print the number using scientific notation (also known as scientific form, standard index form, or standard form
* in the UK). The format for scientific notation varies by locale; for example, many Western locales display the
* number in the form "#E0", where the number is displayed with one digit before the decimal separator, zero or more
* digits after the decimal separator, and the corresponding power of 10 displayed after the "E".
*
* <p>
* Example outputs in <em>en-US</em> when printing 8.765E4 through 8.765E-3:
*
* <pre>
* 8.765E4
* 8.765E3
* 8.765E2
* 8.765E1
* 8.765E0
* 8.765E-1
* 8.765E-2
* 8.765E-3
* 0E0
* </pre>
*
* @return A ScientificNotation for chaining or passing to the NumberFormatter notation() setter.
* @stable ICU 60
*/
static ScientificNotation scientific();
/**
* Print the number using engineering notation, a variant of scientific notation in which the exponent must be
* divisible by 3.
*
* <p>
* Example outputs in <em>en-US</em> when printing 8.765E4 through 8.765E-3:
*
* <pre>
* 87.65E3
* 8.765E3
* 876.5E0
* 87.65E0
* 8.765E0
* 876.5E-3
* 87.65E-3
* 8.765E-3
* 0E0
* </pre>
*
* @return A ScientificNotation for chaining or passing to the NumberFormatter notation() setter.
* @stable ICU 60
*/
static ScientificNotation engineering();
/**
* Print the number using short-form compact notation.
*
* <p>
* <em>Compact notation</em>, defined in Unicode Technical Standard #35 Part 3 Section 2.4.1, prints numbers with
* localized prefixes or suffixes corresponding to different powers of ten. Compact notation is similar to
* engineering notation in how it scales numbers.
*
* <p>
* Compact notation is ideal for displaying large numbers (over ~1000) to humans while at the same time minimizing
* screen real estate.
*
* <p>
* In short form, the powers of ten are abbreviated. In <em>en-US</em>, the abbreviations are "K" for thousands, "M"
* for millions, "B" for billions, and "T" for trillions. Example outputs in <em>en-US</em> when printing 8.765E7
* through 8.765E0:
*
* <pre>
* 88M
* 8.8M
* 876K
* 88K
* 8.8K
* 876
* 88
* 8.8
* </pre>
*
* <p>
* When compact notation is specified without an explicit rounding precision, numbers are rounded off to the closest
* integer after scaling the number by the corresponding power of 10, but with a digit shown after the decimal
* separator if there is only one digit before the decimal separator. The default compact notation rounding precision
* is equivalent to:
*
* <pre>
* Precision::integer().withMinDigits(2)
* </pre>
*
* @return A CompactNotation for passing to the NumberFormatter notation() setter.
* @stable ICU 60
*/
static CompactNotation compactShort();
/**
* Print the number using long-form compact notation. For more information on compact notation, see
* {@link #compactShort}.
*
* <p>
* In long form, the powers of ten are spelled out fully. Example outputs in <em>en-US</em> when printing 8.765E7
* through 8.765E0:
*
* <pre>
* 88 million
* 8.8 million
* 876 thousand
* 88 thousand
* 8.8 thousand
* 876
* 88
* 8.8
* </pre>
*
* @return A CompactNotation for passing to the NumberFormatter notation() setter.
* @stable ICU 60
*/
static CompactNotation compactLong();
/**
* Print the number using simple notation without any scaling by powers of ten. This is the default behavior.
*
* <p>
* Since this is the default behavior, this method needs to be called only when it is necessary to override a
* previous setting.
*
* <p>
* Example outputs in <em>en-US</em> when printing 8.765E7 through 8.765E0:
*
* <pre>
* 87,650,000
* 8,765,000
* 876,500
* 87,650
* 8,765
* 876.5
* 87.65
* 8.765
* </pre>
*
* @return A SimpleNotation for passing to the NumberFormatter notation() setter.
* @stable ICU 60
*/
static SimpleNotation simple();
private:
enum NotationType {
NTN_SCIENTIFIC, NTN_COMPACT, NTN_SIMPLE, NTN_ERROR
} fType;
union NotationUnion {
// For NTN_SCIENTIFIC
/** @internal */
struct ScientificSettings {
/** @internal */
int8_t fEngineeringInterval;
/** @internal */
bool fRequireMinInt;
/** @internal */
impl::digits_t fMinExponentDigits;
/** @internal */
UNumberSignDisplay fExponentSignDisplay;
} scientific;
// For NTN_COMPACT
UNumberCompactStyle compactStyle;
// For NTN_ERROR
UErrorCode errorCode;
} fUnion;
typedef NotationUnion::ScientificSettings ScientificSettings;
Notation(const NotationType &type, const NotationUnion &union_) : fType(type), fUnion(union_) {}
Notation(UErrorCode errorCode) : fType(NTN_ERROR) {
fUnion.errorCode = errorCode;
}
Notation() : fType(NTN_SIMPLE), fUnion() {}
UBool copyErrorTo(UErrorCode &status) const {
if (fType == NTN_ERROR) {
status = fUnion.errorCode;
return TRUE;
}
return FALSE;
}
// To allow MacroProps to initialize empty instances:
friend struct impl::MacroProps;
friend class ScientificNotation;
// To allow implementation to access internal types:
friend class impl::NumberFormatterImpl;
friend class impl::ScientificModifier;
friend class impl::ScientificHandler;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
};
/**
* A class that defines the scientific notation style to be used when formatting numbers in NumberFormatter.
*
* <p>
* To create a ScientificNotation, use one of the factory methods in {@link Notation}.
*
* @stable ICU 60
*/
class U_I18N_API ScientificNotation : public Notation {
public:
/**
* Sets the minimum number of digits to show in the exponent of scientific notation, padding with zeros if
* necessary. Useful for fixed-width display.
*
* <p>
* For example, with minExponentDigits=2, the number 123 will be printed as "1.23E02" in <em>en-US</em> instead of
* the default "1.23E2".
*
* @param minExponentDigits
* The minimum number of digits to show in the exponent.
* @return A ScientificNotation, for chaining.
* @stable ICU 60
*/
ScientificNotation withMinExponentDigits(int32_t minExponentDigits) const;
/**
* Sets whether to show the sign on positive and negative exponents in scientific notation. The default is AUTO,
* showing the minus sign but not the plus sign.
*
* <p>
* For example, with exponentSignDisplay=ALWAYS, the number 123 will be printed as "1.23E+2" in <em>en-US</em>
* instead of the default "1.23E2".
*
* @param exponentSignDisplay
* The strategy for displaying the sign in the exponent.
* @return A ScientificNotation, for chaining.
* @stable ICU 60
*/
ScientificNotation withExponentSignDisplay(UNumberSignDisplay exponentSignDisplay) const;
private:
// Inherit constructor
using Notation::Notation;
// Raw constructor for NumberPropertyMapper
ScientificNotation(int8_t fEngineeringInterval, bool fRequireMinInt, impl::digits_t fMinExponentDigits,
UNumberSignDisplay fExponentSignDisplay);
friend class Notation;
// So that NumberPropertyMapper can create instances
friend class impl::NumberPropertyMapper;
};
/**
* Extra name reserved in case it is needed in the future.
*
* @stable ICU 63
*/
typedef Precision SignificantDigitsPrecision;
/**
* A class that defines the rounding precision to be used when formatting numbers in NumberFormatter.
*
* <p>
* To create a Precision, use one of the factory methods.
*
* @stable ICU 60
*/
class U_I18N_API Precision : public UMemory {
public:
/**
* Show all available digits to full precision.
*
* <p>
* <strong>NOTE:</strong> When formatting a <em>double</em>, this method, along with {@link #minFraction} and
* {@link #minSignificantDigits}, will trigger complex algorithm similar to <em>Dragon4</em> to determine the
* low-order digits and the number of digits to display based on the value of the double.
* If the number of fraction places or significant digits can be bounded, consider using {@link #maxFraction}
* or {@link #maxSignificantDigits} instead to maximize performance.
* For more information, read the following blog post.
*
* <p>
* http://www.serpentine.com/blog/2011/06/29/here-be-dragons-advances-in-problems-you-didnt-even-know-you-had/
*
* @return A Precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static Precision unlimited();
/**
* Show numbers rounded if necessary to the nearest integer.
*
* @return A FractionPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static FractionPrecision integer();
/**
* Show numbers rounded if necessary to a certain number of fraction places (numerals after the decimal separator).
* Additionally, pad with zeros to ensure that this number of places are always shown.
*
* <p>
* Example output with minMaxFractionPlaces = 3:
*
* <p>
* 87,650.000<br>
* 8,765.000<br>
* 876.500<br>
* 87.650<br>
* 8.765<br>
* 0.876<br>
* 0.088<br>
* 0.009<br>
* 0.000 (zero)
*
* <p>
* This method is equivalent to {@link #minMaxFraction} with both arguments equal.
*
* @param minMaxFractionPlaces
* The minimum and maximum number of numerals to display after the decimal separator (rounding if too
* long or padding with zeros if too short).
* @return A FractionPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static FractionPrecision fixedFraction(int32_t minMaxFractionPlaces);
/**
* Always show at least a certain number of fraction places after the decimal separator, padding with zeros if
* necessary. Do not perform rounding (display numbers to their full precision).
*
* <p>
* <strong>NOTE:</strong> If you are formatting <em>doubles</em>, see the performance note in {@link #unlimited}.
*
* @param minFractionPlaces
* The minimum number of numerals to display after the decimal separator (padding with zeros if
* necessary).
* @return A FractionPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static FractionPrecision minFraction(int32_t minFractionPlaces);
/**
* Show numbers rounded if necessary to a certain number of fraction places (numerals after the decimal separator).
* Unlike the other fraction rounding strategies, this strategy does <em>not</em> pad zeros to the end of the
* number.
*
* @param maxFractionPlaces
* The maximum number of numerals to display after the decimal mark (rounding if necessary).
* @return A FractionPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static FractionPrecision maxFraction(int32_t maxFractionPlaces);
/**
* Show numbers rounded if necessary to a certain number of fraction places (numerals after the decimal separator);
* in addition, always show at least a certain number of places after the decimal separator, padding with zeros if
* necessary.
*
* @param minFractionPlaces
* The minimum number of numerals to display after the decimal separator (padding with zeros if
* necessary).
* @param maxFractionPlaces
* The maximum number of numerals to display after the decimal separator (rounding if necessary).
* @return A FractionPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static FractionPrecision minMaxFraction(int32_t minFractionPlaces, int32_t maxFractionPlaces);
/**
* Show numbers rounded if necessary to a certain number of significant digits or significant figures. Additionally,
* pad with zeros to ensure that this number of significant digits/figures are always shown.
*
* <p>
* This method is equivalent to {@link #minMaxSignificantDigits} with both arguments equal.
*
* @param minMaxSignificantDigits
* The minimum and maximum number of significant digits to display (rounding if too long or padding with
* zeros if too short).
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 62
*/
static SignificantDigitsPrecision fixedSignificantDigits(int32_t minMaxSignificantDigits);
/**
* Always show at least a certain number of significant digits/figures, padding with zeros if necessary. Do not
* perform rounding (display numbers to their full precision).
*
* <p>
* <strong>NOTE:</strong> If you are formatting <em>doubles</em>, see the performance note in {@link #unlimited}.
*
* @param minSignificantDigits
* The minimum number of significant digits to display (padding with zeros if too short).
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 62
*/
static SignificantDigitsPrecision minSignificantDigits(int32_t minSignificantDigits);
/**
* Show numbers rounded if necessary to a certain number of significant digits/figures.
*
* @param maxSignificantDigits
* The maximum number of significant digits to display (rounding if too long).
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 62
*/
static SignificantDigitsPrecision maxSignificantDigits(int32_t maxSignificantDigits);
/**
* Show numbers rounded if necessary to a certain number of significant digits/figures; in addition, always show at
* least a certain number of significant digits, padding with zeros if necessary.
*
* @param minSignificantDigits
* The minimum number of significant digits to display (padding with zeros if necessary).
* @param maxSignificantDigits
* The maximum number of significant digits to display (rounding if necessary).
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 62
*/
static SignificantDigitsPrecision minMaxSignificantDigits(int32_t minSignificantDigits,
int32_t maxSignificantDigits);
/**
* Show numbers rounded if necessary to the closest multiple of a certain rounding increment. For example, if the
* rounding increment is 0.5, then round 1.2 to 1 and round 1.3 to 1.5.
*
* <p>
* In order to ensure that numbers are padded to the appropriate number of fraction places, call
* withMinFraction() on the return value of this method.
* For example, to round to the nearest 0.5 and always display 2 numerals after the
* decimal separator (to display 1.2 as "1.00" and 1.3 as "1.50"), you can run:
*
* <pre>
* Precision::increment(0.5).withMinFraction(2)
* </pre>
*
* @param roundingIncrement
* The increment to which to round numbers.
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static IncrementPrecision increment(double roundingIncrement);
/**
* Show numbers rounded and padded according to the rules for the currency unit. The most common
* rounding precision settings for currencies include <code>Precision::fixedFraction(2)</code>,
* <code>Precision::integer()</code>, and <code>Precision::increment(0.05)</code> for cash transactions
* ("nickel rounding").
*
* <p>
* The exact rounding details will be resolved at runtime based on the currency unit specified in the
* NumberFormatter chain. To round according to the rules for one currency while displaying the symbol for another
* currency, the withCurrency() method can be called on the return value of this method.
*
* @param currencyUsage
* Either STANDARD (for digital transactions) or CASH (for transactions where the rounding increment may
* be limited by the available denominations of cash or coins).
* @return A CurrencyPrecision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
static CurrencyPrecision currency(UCurrencyUsage currencyUsage);
private:
enum PrecisionType {
RND_BOGUS,
RND_NONE,
RND_FRACTION,
RND_SIGNIFICANT,
RND_FRACTION_SIGNIFICANT,
// Used for strange increments like 3.14.
RND_INCREMENT,
// Used for increments with 1 as the only digit. This is different than fraction
// rounding because it supports having additional trailing zeros. For example, this
// class is used to round with the increment 0.010.
RND_INCREMENT_ONE,
// Used for increments with 5 as the only digit (nickel rounding).
RND_INCREMENT_FIVE,
RND_CURRENCY,
RND_ERROR
} fType;
union PrecisionUnion {
/** @internal */
struct FractionSignificantSettings {
// For RND_FRACTION, RND_SIGNIFICANT, and RND_FRACTION_SIGNIFICANT
/** @internal */
impl::digits_t fMinFrac;
/** @internal */
impl::digits_t fMaxFrac;
/** @internal */
impl::digits_t fMinSig;
/** @internal */
impl::digits_t fMaxSig;
} fracSig;
/** @internal */
struct IncrementSettings {
// For RND_INCREMENT, RND_INCREMENT_ONE, and RND_INCREMENT_FIVE
/** @internal */
double fIncrement;
/** @internal */
impl::digits_t fMinFrac;
/** @internal */
impl::digits_t fMaxFrac;
} increment;
UCurrencyUsage currencyUsage; // For RND_CURRENCY
UErrorCode errorCode; // For RND_ERROR
} fUnion;
typedef PrecisionUnion::FractionSignificantSettings FractionSignificantSettings;
typedef PrecisionUnion::IncrementSettings IncrementSettings;
/** The Precision encapsulates the RoundingMode when used within the implementation. */
UNumberFormatRoundingMode fRoundingMode;
Precision(const PrecisionType& type, const PrecisionUnion& union_,
UNumberFormatRoundingMode roundingMode)
: fType(type), fUnion(union_), fRoundingMode(roundingMode) {}
Precision(UErrorCode errorCode) : fType(RND_ERROR) {
fUnion.errorCode = errorCode;
}
Precision() : fType(RND_BOGUS) {}
bool isBogus() const {
return fType == RND_BOGUS;
}
UBool copyErrorTo(UErrorCode &status) const {
if (fType == RND_ERROR) {
status = fUnion.errorCode;
return TRUE;
}
return FALSE;
}
// On the parent type so that this method can be called internally on Precision instances.
Precision withCurrency(const CurrencyUnit ¤cy, UErrorCode &status) const;
static FractionPrecision constructFraction(int32_t minFrac, int32_t maxFrac);
static Precision constructSignificant(int32_t minSig, int32_t maxSig);
static Precision
constructFractionSignificant(const FractionPrecision &base, int32_t minSig, int32_t maxSig);
static IncrementPrecision constructIncrement(double increment, int32_t minFrac);
static CurrencyPrecision constructCurrency(UCurrencyUsage usage);
static Precision constructPassThrough();
// To allow MacroProps/MicroProps to initialize bogus instances:
friend struct impl::MacroProps;
friend struct impl::MicroProps;
// To allow NumberFormatterImpl to access isBogus() and other internal methods:
friend class impl::NumberFormatterImpl;
// To allow NumberPropertyMapper to create instances from DecimalFormatProperties:
friend class impl::NumberPropertyMapper;
// To allow access to the main implementation class:
friend class impl::RoundingImpl;
// To allow child classes to call private methods:
friend class FractionPrecision;
friend class CurrencyPrecision;
friend class IncrementPrecision;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
};
/**
* A class that defines a rounding precision based on a number of fraction places and optionally significant digits to be
* used when formatting numbers in NumberFormatter.
*
* <p>
* To create a FractionPrecision, use one of the factory methods on Precision.
*
* @stable ICU 60
*/
class U_I18N_API FractionPrecision : public Precision {
public:
/**
* Ensure that no less than this number of significant digits are retained when rounding according to fraction
* rules.
*
* <p>
* For example, with integer rounding, the number 3.141 becomes "3". However, with minimum figures set to 2, 3.141
* becomes "3.1" instead.
*
* <p>
* This setting does not affect the number of trailing zeros. For example, 3.01 would print as "3", not "3.0".
*
* @param minSignificantDigits
* The number of significant figures to guarantee.
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
Precision withMinDigits(int32_t minSignificantDigits) const;
/**
* Ensure that no more than this number of significant digits are retained when rounding according to fraction
* rules.
*
* <p>
* For example, with integer rounding, the number 123.4 becomes "123". However, with maximum figures set to 2, 123.4
* becomes "120" instead.
*
* <p>
* This setting does not affect the number of trailing zeros. For example, with fixed fraction of 2, 123.4 would
* become "120.00".
*
* @param maxSignificantDigits
* Round the number to no more than this number of significant figures.
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
Precision withMaxDigits(int32_t maxSignificantDigits) const;
private:
// Inherit constructor
using Precision::Precision;
// To allow parent class to call this class's constructor:
friend class Precision;
};
/**
* A class that defines a rounding precision parameterized by a currency to be used when formatting numbers in
* NumberFormatter.
*
* <p>
* To create a CurrencyPrecision, use one of the factory methods on Precision.
*
* @stable ICU 60
*/
class U_I18N_API CurrencyPrecision : public Precision {
public:
/**
* Associates a currency with this rounding precision.
*
* <p>
* <strong>Calling this method is <em>not required</em></strong>, because the currency specified in unit()
* is automatically applied to currency rounding precisions. However,
* this method enables you to override that automatic association.
*
* <p>
* This method also enables numbers to be formatted using currency rounding rules without explicitly using a
* currency format.
*
* @param currency
* The currency to associate with this rounding precision.
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
Precision withCurrency(const CurrencyUnit ¤cy) const;
private:
// Inherit constructor
using Precision::Precision;
// To allow parent class to call this class's constructor:
friend class Precision;
};
/**
* A class that defines a rounding precision parameterized by a rounding increment to be used when formatting numbers in
* NumberFormatter.
*
* <p>
* To create an IncrementPrecision, use one of the factory methods on Precision.
*
* @stable ICU 60
*/
class U_I18N_API IncrementPrecision : public Precision {
public:
/**
* Specifies the minimum number of fraction digits to render after the decimal separator, padding with zeros if
* necessary. By default, no trailing zeros are added.
*
* <p>
* For example, if the rounding increment is 0.5 and minFrac is 2, then the resulting strings include "0.00",
* "0.50", "1.00", and "1.50".
*
* <p>
* Note: In ICU4J, this functionality is accomplished via the scale of the BigDecimal rounding increment.
*
* @param minFrac The minimum number of digits after the decimal separator.
* @return A precision for chaining or passing to the NumberFormatter precision() setter.
* @stable ICU 60
*/
Precision withMinFraction(int32_t minFrac) const;
private:
// Inherit constructor
using Precision::Precision;
// To allow parent class to call this class's constructor:
friend class Precision;
};
/**
* A class that defines the strategy for padding and truncating integers before the decimal separator.
*
* <p>
* To create an IntegerWidth, use one of the factory methods.
*
* @stable ICU 60
* @see NumberFormatter
*/
class U_I18N_API IntegerWidth : public UMemory {
public:
/**
* Pad numbers at the beginning with zeros to guarantee a certain number of numerals before the decimal separator.
*
* <p>
* For example, with minInt=3, the number 55 will get printed as "055".
*
* @param minInt
* The minimum number of places before the decimal separator.
* @return An IntegerWidth for chaining or passing to the NumberFormatter integerWidth() setter.
* @stable ICU 60
*/
static IntegerWidth zeroFillTo(int32_t minInt);
/**
* Truncate numbers exceeding a certain number of numerals before the decimal separator.
*
* For example, with maxInt=3, the number 1234 will get printed as "234".
*
* @param maxInt
* The maximum number of places before the decimal separator. maxInt == -1 means no
* truncation.
* @return An IntegerWidth for passing to the NumberFormatter integerWidth() setter.
* @stable ICU 60
*/
IntegerWidth truncateAt(int32_t maxInt);
private:
union {
struct {
impl::digits_t fMinInt;
impl::digits_t fMaxInt;
bool fFormatFailIfMoreThanMaxDigits;
} minMaxInt;
UErrorCode errorCode;
} fUnion;
bool fHasError = false;
IntegerWidth(impl::digits_t minInt, impl::digits_t maxInt, bool formatFailIfMoreThanMaxDigits);
IntegerWidth(UErrorCode errorCode) { // NOLINT
fUnion.errorCode = errorCode;
fHasError = true;
}
IntegerWidth() { // NOLINT
fUnion.minMaxInt.fMinInt = -1;
}
/** Returns the default instance. */
static IntegerWidth standard() {
return IntegerWidth::zeroFillTo(1);
}
bool isBogus() const {
return !fHasError && fUnion.minMaxInt.fMinInt == -1;
}
UBool copyErrorTo(UErrorCode &status) const {
if (fHasError) {
status = fUnion.errorCode;
return TRUE;
}
return FALSE;
}
void apply(impl::DecimalQuantity &quantity, UErrorCode &status) const;
bool operator==(const IntegerWidth& other) const;
// To allow MacroProps/MicroProps to initialize empty instances:
friend struct impl::MacroProps;
friend struct impl::MicroProps;
// To allow NumberFormatterImpl to access isBogus() and perform other operations:
friend class impl::NumberFormatterImpl;
// So that NumberPropertyMapper can create instances
friend class impl::NumberPropertyMapper;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
};
/**
* A class that defines a quantity by which a number should be multiplied when formatting.
*
* <p>
* To create a Scale, use one of the factory methods.
*
* @stable ICU 62
*/
class U_I18N_API Scale : public UMemory {
public:
/**
* Do not change the value of numbers when formatting or parsing.
*
* @return A Scale to prevent any multiplication.
* @stable ICU 62
*/
static Scale none();
/**
* Multiply numbers by a power of ten before formatting. Useful for combining with a percent unit:
*
* <pre>
* NumberFormatter::with().unit(NoUnit::percent()).multiplier(Scale::powerOfTen(2))
* </pre>
*
* @return A Scale for passing to the setter in NumberFormatter.
* @stable ICU 62
*/
static Scale powerOfTen(int32_t power);
/**
* Multiply numbers by an arbitrary value before formatting. Useful for unit conversions.
*
* This method takes a string in a decimal number format with syntax
* as defined in the Decimal Arithmetic Specification, available at
* http://speleotrove.com/decimal
*
* Also see the version of this method that takes a double.
*
* @return A Scale for passing to the setter in NumberFormatter.
* @stable ICU 62
*/
static Scale byDecimal(StringPiece multiplicand);
/**
* Multiply numbers by an arbitrary value before formatting. Useful for unit conversions.
*
* This method takes a double; also see the version of this method that takes an exact decimal.
*
* @return A Scale for passing to the setter in NumberFormatter.
* @stable ICU 62
*/
static Scale byDouble(double multiplicand);
/**
* Multiply a number by both a power of ten and by an arbitrary double value.
*
* @return A Scale for passing to the setter in NumberFormatter.
* @stable ICU 62
*/
static Scale byDoubleAndPowerOfTen(double multiplicand, int32_t power);
// We need a custom destructor for the DecNum, which means we need to declare
// the copy/move constructor/assignment quartet.
/** @stable ICU 62 */
Scale(const Scale& other);
/** @stable ICU 62 */
Scale& operator=(const Scale& other);
/** @stable ICU 62 */
Scale(Scale&& src) U_NOEXCEPT;
/** @stable ICU 62 */
Scale& operator=(Scale&& src) U_NOEXCEPT;
/** @stable ICU 62 */
~Scale();
#ifndef U_HIDE_INTERNAL_API
/** @internal */
Scale(int32_t magnitude, impl::DecNum* arbitraryToAdopt);
#endif /* U_HIDE_INTERNAL_API */
private:
int32_t fMagnitude;
impl::DecNum* fArbitrary;
UErrorCode fError;
Scale(UErrorCode error) : fMagnitude(0), fArbitrary(nullptr), fError(error) {}
Scale() : fMagnitude(0), fArbitrary(nullptr), fError(U_ZERO_ERROR) {}
bool isValid() const {
return fMagnitude != 0 || fArbitrary != nullptr;
}
UBool copyErrorTo(UErrorCode &status) const {
if (fError != U_ZERO_ERROR) {
status = fError;
return TRUE;
}
return FALSE;
}
void applyTo(impl::DecimalQuantity& quantity) const;
void applyReciprocalTo(impl::DecimalQuantity& quantity) const;
// To allow MacroProps/MicroProps to initialize empty instances:
friend struct impl::MacroProps;
friend struct impl::MicroProps;
// To allow NumberFormatterImpl to access isBogus() and perform other operations:
friend class impl::NumberFormatterImpl;
// To allow the helper class MultiplierFormatHandler access to private fields:
friend class impl::MultiplierFormatHandler;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
// To allow access to parsing code:
friend class ::icu::numparse::impl::NumberParserImpl;
friend class ::icu::numparse::impl::MultiplierParseHandler;
};
namespace impl {
// Do not enclose entire SymbolsWrapper with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
class U_I18N_API SymbolsWrapper : public UMemory {
public:
/** @internal */
SymbolsWrapper() : fType(SYMPTR_NONE), fPtr{nullptr} {}
/** @internal */
SymbolsWrapper(const SymbolsWrapper &other);
/** @internal */
SymbolsWrapper &operator=(const SymbolsWrapper &other);
/** @internal */
SymbolsWrapper(SymbolsWrapper&& src) U_NOEXCEPT;
/** @internal */
SymbolsWrapper &operator=(SymbolsWrapper&& src) U_NOEXCEPT;
/** @internal */
~SymbolsWrapper();
#ifndef U_HIDE_INTERNAL_API
/**
* The provided object is copied, but we do not adopt it.
* @internal
*/
void setTo(const DecimalFormatSymbols &dfs);
/**
* Adopt the provided object.
* @internal
*/
void setTo(const NumberingSystem *ns);
/**
* Whether the object is currently holding a DecimalFormatSymbols.
* @internal
*/
bool isDecimalFormatSymbols() const;
/**
* Whether the object is currently holding a NumberingSystem.
* @internal
*/
bool isNumberingSystem() const;
/**
* Get the DecimalFormatSymbols pointer. No ownership change.
* @internal
*/
const DecimalFormatSymbols *getDecimalFormatSymbols() const;
/**
* Get the NumberingSystem pointer. No ownership change.
* @internal
*/
const NumberingSystem *getNumberingSystem() const;
#endif // U_HIDE_INTERNAL_API
/** @internal */
UBool copyErrorTo(UErrorCode &status) const {
if (fType == SYMPTR_DFS && fPtr.dfs == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return TRUE;
} else if (fType == SYMPTR_NS && fPtr.ns == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
return TRUE;
}
return FALSE;
}
private:
enum SymbolsPointerType {
SYMPTR_NONE, SYMPTR_DFS, SYMPTR_NS
} fType;
union {
const DecimalFormatSymbols *dfs;
const NumberingSystem *ns;
} fPtr;
void doCopyFrom(const SymbolsWrapper &other);
void doMoveFrom(SymbolsWrapper&& src);
void doCleanup();
};
// Do not enclose entire Grouper with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
class U_I18N_API Grouper : public UMemory {
public:
#ifndef U_HIDE_INTERNAL_API
/** @internal */
static Grouper forStrategy(UNumberGroupingStrategy grouping);
/**
* Resolve the values in Properties to a Grouper object.
* @internal
*/
static Grouper forProperties(const DecimalFormatProperties& properties);
// Future: static Grouper forProperties(DecimalFormatProperties& properties);
/** @internal */
Grouper(int16_t grouping1, int16_t grouping2, int16_t minGrouping, UNumberGroupingStrategy strategy)
: fGrouping1(grouping1),
fGrouping2(grouping2),
fMinGrouping(minGrouping),
fStrategy(strategy) {}
#endif // U_HIDE_INTERNAL_API
/** @internal */
int16_t getPrimary() const;
/** @internal */
int16_t getSecondary() const;
private:
/**
* The grouping sizes, with the following special values:
* <ul>
* <li>-1 = no grouping
* <li>-2 = needs locale data
* <li>-4 = fall back to Western grouping if not in locale
* </ul>
*/
int16_t fGrouping1;
int16_t fGrouping2;
/**
* The minimum grouping size, with the following special values:
* <ul>
* <li>-2 = needs locale data
* <li>-3 = no less than 2
* </ul>
*/
int16_t fMinGrouping;
/**
* The UNumberGroupingStrategy that was used to create this Grouper, or UNUM_GROUPING_COUNT if this
* was not created from a UNumberGroupingStrategy.
*/
UNumberGroupingStrategy fStrategy;
Grouper() : fGrouping1(-3) {}
bool isBogus() const {
return fGrouping1 == -3;
}
/** NON-CONST: mutates the current instance. */
void setLocaleData(const impl::ParsedPatternInfo &patternInfo, const Locale& locale);
bool groupAtPosition(int32_t position, const impl::DecimalQuantity &value) const;
// To allow MacroProps/MicroProps to initialize empty instances:
friend struct MacroProps;
friend struct MicroProps;
// To allow NumberFormatterImpl to access isBogus() and perform other operations:
friend class NumberFormatterImpl;
// To allow NumberParserImpl to perform setLocaleData():
friend class ::icu::numparse::impl::NumberParserImpl;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
};
// Do not enclose entire Padder with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
class U_I18N_API Padder : public UMemory {
public:
#ifndef U_HIDE_INTERNAL_API
/** @internal */
static Padder none();
/** @internal */
static Padder codePoints(UChar32 cp, int32_t targetWidth, UNumberFormatPadPosition position);
#endif // U_HIDE_INTERNAL_API
/** @internal */
static Padder forProperties(const DecimalFormatProperties& properties);
private:
UChar32 fWidth; // -3 = error; -2 = bogus; -1 = no padding
union {
struct {
int32_t fCp;
UNumberFormatPadPosition fPosition;
} padding;
UErrorCode errorCode;
} fUnion;
Padder(UChar32 cp, int32_t width, UNumberFormatPadPosition position);
Padder(int32_t width);
Padder(UErrorCode errorCode) : fWidth(-3) { // NOLINT
fUnion.errorCode = errorCode;
}
Padder() : fWidth(-2) {} // NOLINT
bool isBogus() const {
return fWidth == -2;
}
UBool copyErrorTo(UErrorCode &status) const {
if (fWidth == -3) {
status = fUnion.errorCode;
return TRUE;
}
return FALSE;
}
bool isValid() const {
return fWidth > 0;
}
int32_t padAndApply(const impl::Modifier &mod1, const impl::Modifier &mod2,
FormattedStringBuilder &string, int32_t leftIndex, int32_t rightIndex,
UErrorCode &status) const;
// To allow MacroProps/MicroProps to initialize empty instances:
friend struct MacroProps;
friend struct MicroProps;
// To allow NumberFormatterImpl to access isBogus() and perform other operations:
friend class impl::NumberFormatterImpl;
// To allow access to the skeleton generation code:
friend class impl::GeneratorHelpers;
};
// Do not enclose entire MacroProps with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
struct U_I18N_API MacroProps : public UMemory {
/** @internal */
Notation notation;
/** @internal */
MeasureUnit unit; // = NoUnit::base();
/** @internal */
MeasureUnit perUnit; // = NoUnit::base();
/** @internal */
Precision precision; // = Precision(); (bogus)
/** @internal */
UNumberFormatRoundingMode roundingMode = UNUM_ROUND_HALFEVEN;
/** @internal */
Grouper grouper; // = Grouper(); (bogus)
/** @internal */
Padder padder; // = Padder(); (bogus)
/** @internal */
IntegerWidth integerWidth; // = IntegerWidth(); (bogus)
/** @internal */
SymbolsWrapper symbols;
// UNUM_XYZ_COUNT denotes null (bogus) values.
/** @internal */
UNumberUnitWidth unitWidth = UNUM_UNIT_WIDTH_COUNT;
/** @internal */
UNumberSignDisplay sign = UNUM_SIGN_COUNT;
/** @internal */
UNumberDecimalSeparatorDisplay decimal = UNUM_DECIMAL_SEPARATOR_COUNT;
/** @internal */
Scale scale; // = Scale(); (benign value)
/** @internal */
const AffixPatternProvider* affixProvider = nullptr; // no ownership
/** @internal */
const PluralRules* rules = nullptr; // no ownership
/** @internal */
const CurrencySymbols* currencySymbols = nullptr; // no ownership
/** @internal */
int32_t threshold = kInternalDefaultThreshold;
/** @internal */
Locale locale;
// NOTE: Uses default copy and move constructors.
/**
* Check all members for errors.
* @internal
*/
bool copyErrorTo(UErrorCode &status) const {
return notation.copyErrorTo(status) || precision.copyErrorTo(status) ||
padder.copyErrorTo(status) || integerWidth.copyErrorTo(status) ||
symbols.copyErrorTo(status) || scale.copyErrorTo(status);
}
};
} // namespace impl
/**
* An abstract base class for specifying settings related to number formatting. This class is implemented by
* {@link UnlocalizedNumberFormatter} and {@link LocalizedNumberFormatter}. This class is not intended for
* public subclassing.
*/
template<typename Derived>
class U_I18N_API NumberFormatterSettings {
public:
/**
* Specifies the notation style (simple, scientific, or compact) for rendering numbers.
*
* <ul>
* <li>Simple notation: "12,300"
* <li>Scientific notation: "1.23E4"
* <li>Compact notation: "12K"
* </ul>
*
* <p>
* All notation styles will be properly localized with locale data, and all notation styles are compatible with
* units, rounding precisions, and other number formatter settings.
*
* <p>
* Pass this method the return value of a {@link Notation} factory method. For example:
*
* <pre>
* NumberFormatter::with().notation(Notation::compactShort())
* </pre>
*
* The default is to use simple notation.
*
* @param notation
* The notation strategy to use.
* @return The fluent chain.
* @see Notation
* @stable ICU 60
*/
Derived notation(const Notation ¬ation) const &;
/**
* Overload of notation() for use on an rvalue reference.
*
* @param notation
* The notation strategy to use.
* @return The fluent chain.
* @see #notation
* @stable ICU 62
*/
Derived notation(const Notation ¬ation) &&;
/**
* Specifies the unit (unit of measure, currency, or percent) to associate with rendered numbers.
*
* <ul>
* <li>Unit of measure: "12.3 meters"
* <li>Currency: "$12.30"
* <li>Percent: "12.3%"
* </ul>
*
* All units will be properly localized with locale data, and all units are compatible with notation styles,
* rounding precisions, and other number formatter settings.
*
* Pass this method any instance of {@link MeasureUnit}. For units of measure:
*
* <pre>
* NumberFormatter::with().unit(MeasureUnit::getMeter())
* </pre>
*
* Currency:
*
* <pre>
* NumberFormatter::with().unit(CurrencyUnit(u"USD", status))
* </pre>
*
* Percent:
*
* <pre>
* NumberFormatter::with().unit(NoUnit.percent())
* </pre>
*
* See {@link #perUnit} for information on how to format strings like "5 meters per second".
*
* The default is to render without units (equivalent to NoUnit.base()).
*
* @param unit
* The unit to render.
* @return The fluent chain.
* @see MeasureUnit
* @see Currency
* @see NoUnit
* @see #perUnit
* @stable ICU 60
*/
Derived unit(const icu::MeasureUnit &unit) const &;
/**
* Overload of unit() for use on an rvalue reference.
*
* @param unit
* The unit to render.
* @return The fluent chain.
* @see #unit
* @stable ICU 62
*/
Derived unit(const icu::MeasureUnit &unit) &&;
/**
* Like unit(), but takes ownership of a pointer. Convenient for use with the MeasureFormat factory
* methods that return pointers that need ownership.
*
* Note: consider using the MeasureFormat factory methods that return by value.
*
* @param unit
* The unit to render.
* @return The fluent chain.
* @see #unit
* @see MeasureUnit
* @stable ICU 60
*/
Derived adoptUnit(icu::MeasureUnit *unit) const &;
/**
* Overload of adoptUnit() for use on an rvalue reference.
*
* @param unit
* The unit to render.
* @return The fluent chain.
* @see #adoptUnit
* @stable ICU 62
*/
Derived adoptUnit(icu::MeasureUnit *unit) &&;
/**
* Sets a unit to be used in the denominator. For example, to format "3 m/s", pass METER to the unit and SECOND to
* the perUnit.
*
* Pass this method any instance of {@link MeasureUnit}. Example:
*
* <pre>
* NumberFormatter::with()
* .unit(MeasureUnit::getMeter())
* .perUnit(MeasureUnit::getSecond())
* </pre>
*
* The default is not to display any unit in the denominator.
*
* If a per-unit is specified without a primary unit via {@link #unit}, the behavior is undefined.
*
* @param perUnit
* The unit to render in the denominator.
* @return The fluent chain
* @see #unit
* @stable ICU 61
*/
Derived perUnit(const icu::MeasureUnit &perUnit) const &;
/**
* Overload of perUnit() for use on an rvalue reference.
*
* @param perUnit
* The unit to render in the denominator.
* @return The fluent chain.
* @see #perUnit
* @stable ICU 62
*/
Derived perUnit(const icu::MeasureUnit &perUnit) &&;
/**
* Like perUnit(), but takes ownership of a pointer. Convenient for use with the MeasureFormat factory
* methods that return pointers that need ownership.
*
* Note: consider using the MeasureFormat factory methods that return by value.
*
* @param perUnit
* The unit to render in the denominator.
* @return The fluent chain.
* @see #perUnit
* @see MeasureUnit
* @stable ICU 61
*/
Derived adoptPerUnit(icu::MeasureUnit *perUnit) const &;
/**
* Overload of adoptPerUnit() for use on an rvalue reference.
*
* @param perUnit
* The unit to render in the denominator.
* @return The fluent chain.
* @see #adoptPerUnit
* @stable ICU 62
*/
Derived adoptPerUnit(icu::MeasureUnit *perUnit) &&;
/**
* Specifies the rounding precision to use when formatting numbers.
*
* <ul>
* <li>Round to 3 decimal places: "3.142"
* <li>Round to 3 significant figures: "3.14"
* <li>Round to the closest nickel: "3.15"
* <li>Do not perform rounding: "3.1415926..."
* </ul>
*
* <p>
* Pass this method the return value of one of the factory methods on {@link Precision}. For example:
*
* <pre>
* NumberFormatter::with().precision(Precision::fixedFraction(2))
* </pre>
*
* <p>
* In most cases, the default rounding strategy is to round to 6 fraction places; i.e.,
* <code>Precision.maxFraction(6)</code>. The exceptions are if compact notation is being used, then the compact
* notation rounding strategy is used (see {@link Notation#compactShort} for details), or if the unit is a currency,
* then standard currency rounding is used, which varies from currency to currency (see {@link Precision#currency} for
* details).
*
* @param precision
* The rounding precision to use.
* @return The fluent chain.
* @see Precision
* @stable ICU 62
*/
Derived precision(const Precision& precision) const &;
/**
* Overload of precision() for use on an rvalue reference.
*
* @param precision
* The rounding precision to use.
* @return The fluent chain.
* @see #precision
* @stable ICU 62
*/
Derived precision(const Precision& precision) &&;
/**
* Specifies how to determine the direction to round a number when it has more digits than fit in the
* desired precision. When formatting 1.235:
*
* <ul>
* <li>Ceiling rounding mode with integer precision: "2"
* <li>Half-down rounding mode with 2 fixed fraction digits: "1.23"
* <li>Half-up rounding mode with 2 fixed fraction digits: "1.24"
* </ul>
*
* The default is HALF_EVEN. For more information on rounding mode, see the ICU userguide here:
*
* http://userguide.icu-project.org/formatparse/numbers/rounding-modes
*
* @param roundingMode The rounding mode to use.
* @return The fluent chain.
* @stable ICU 62
*/
Derived roundingMode(UNumberFormatRoundingMode roundingMode) const &;
/**
* Overload of roundingMode() for use on an rvalue reference.
*
* @param roundingMode The rounding mode to use.
* @return The fluent chain.
* @see #roundingMode
* @stable ICU 62
*/
Derived roundingMode(UNumberFormatRoundingMode roundingMode) &&;
/**
* Specifies the grouping strategy to use when formatting numbers.
*
* <ul>
* <li>Default grouping: "12,300" and "1,230"
* <li>Grouping with at least 2 digits: "12,300" and "1230"
* <li>No grouping: "12300" and "1230"
* </ul>
*
* <p>
* The exact grouping widths will be chosen based on the locale.
*
* <p>
* Pass this method an element from the {@link UNumberGroupingStrategy} enum. For example:
*
* <pre>
* NumberFormatter::with().grouping(UNUM_GROUPING_MIN2)
* </pre>
*
* The default is to perform grouping according to locale data; most locales, but not all locales,
* enable it by default.
*
* @param strategy
* The grouping strategy to use.
* @return The fluent chain.
* @stable ICU 61
*/
Derived grouping(UNumberGroupingStrategy strategy) const &;
/**
* Overload of grouping() for use on an rvalue reference.
*
* @param strategy
* The grouping strategy to use.
* @return The fluent chain.
* @see #grouping
* @stable ICU 62
*/
Derived grouping(UNumberGroupingStrategy strategy) &&;
/**
* Specifies the minimum and maximum number of digits to render before the decimal mark.
*
* <ul>
* <li>Zero minimum integer digits: ".08"
* <li>One minimum integer digit: "0.08"
* <li>Two minimum integer digits: "00.08"
* </ul>
*
* <p>
* Pass this method the return value of {@link IntegerWidth#zeroFillTo}. For example:
*
* <pre>
* NumberFormatter::with().integerWidth(IntegerWidth::zeroFillTo(2))
* </pre>
*
* The default is to have one minimum integer digit.
*
* @param style
* The integer width to use.
* @return The fluent chain.
* @see IntegerWidth
* @stable ICU 60
*/
Derived integerWidth(const IntegerWidth &style) const &;
/**
* Overload of integerWidth() for use on an rvalue reference.
*
* @param style
* The integer width to use.
* @return The fluent chain.
* @see #integerWidth
* @stable ICU 62
*/
Derived integerWidth(const IntegerWidth &style) &&;
/**
* Specifies the symbols (decimal separator, grouping separator, percent sign, numerals, etc.) to use when rendering
* numbers.
*
* <ul>
* <li><em>en_US</em> symbols: "12,345.67"
* <li><em>fr_FR</em> symbols: "12 345,67"
* <li><em>de_CH</em> symbols: "12’345.67"
* <li><em>my_MY</em> symbols: "၁၂,၃၄၅.၆၇"
* </ul>
*
* <p>
* Pass this method an instance of {@link DecimalFormatSymbols}. For example:
*
* <pre>
* NumberFormatter::with().symbols(DecimalFormatSymbols(Locale("de_CH"), status))
* </pre>
*
* <p>
* <strong>Note:</strong> DecimalFormatSymbols automatically chooses the best numbering system based on the locale.
* In the examples above, the first three are using the Latin numbering system, and the fourth is using the Myanmar
* numbering system.
*
* <p>
* <strong>Note:</strong> The instance of DecimalFormatSymbols will be copied: changes made to the symbols object
* after passing it into the fluent chain will not be seen.
*
* <p>
* <strong>Note:</strong> Calling this method will override any previously specified DecimalFormatSymbols
* or NumberingSystem.
*
* <p>
* The default is to choose the symbols based on the locale specified in the fluent chain.
*
* @param symbols
* The DecimalFormatSymbols to use.
* @return The fluent chain.
* @see DecimalFormatSymbols
* @stable ICU 60
*/
Derived symbols(const DecimalFormatSymbols &symbols) const &;
/**
* Overload of symbols() for use on an rvalue reference.
*
* @param symbols
* The DecimalFormatSymbols to use.
* @return The fluent chain.
* @see #symbols
* @stable ICU 62
*/
Derived symbols(const DecimalFormatSymbols &symbols) &&;
/**
* Specifies that the given numbering system should be used when fetching symbols.
*
* <ul>
* <li>Latin numbering system: "12,345"
* <li>Myanmar numbering system: "၁၂,၃၄၅"
* <li>Math Sans Bold numbering system: "𝟭𝟮,𝟯𝟰𝟱"
* </ul>
*
* <p>
* Pass this method an instance of {@link NumberingSystem}. For example, to force the locale to always use the Latin
* alphabet numbering system (ASCII digits):
*
* <pre>
* NumberFormatter::with().adoptSymbols(NumberingSystem::createInstanceByName("latn", status))
* </pre>
*
* <p>
* <strong>Note:</strong> Calling this method will override any previously specified DecimalFormatSymbols
* or NumberingSystem.
*
* <p>
* The default is to choose the best numbering system for the locale.
*
* <p>
* This method takes ownership of a pointer in order to work nicely with the NumberingSystem factory methods.
*
* @param symbols
* The NumberingSystem to use.
* @return The fluent chain.
* @see NumberingSystem
* @stable ICU 60
*/
Derived adoptSymbols(NumberingSystem *symbols) const &;
/**
* Overload of adoptSymbols() for use on an rvalue reference.
*
* @param symbols
* The NumberingSystem to use.
* @return The fluent chain.
* @see #adoptSymbols
* @stable ICU 62
*/
Derived adoptSymbols(NumberingSystem *symbols) &&;
/**
* Sets the width of the unit (measure unit or currency). Most common values:
*
* <ul>
* <li>Short: "$12.00", "12 m"
* <li>ISO Code: "USD 12.00"
* <li>Full name: "12.00 US dollars", "12 meters"
* </ul>
*
* <p>
* Pass an element from the {@link UNumberUnitWidth} enum to this setter. For example:
*
* <pre>
* NumberFormatter::with().unitWidth(UNumberUnitWidth::UNUM_UNIT_WIDTH_FULL_NAME)
* </pre>
*
* <p>
* The default is the SHORT width.
*
* @param width
* The width to use when rendering numbers.
* @return The fluent chain
* @see UNumberUnitWidth
* @stable ICU 60
*/
Derived unitWidth(UNumberUnitWidth width) const &;
/**
* Overload of unitWidth() for use on an rvalue reference.
*
* @param width
* The width to use when rendering numbers.
* @return The fluent chain.
* @see #unitWidth
* @stable ICU 62
*/
Derived unitWidth(UNumberUnitWidth width) &&;
/**
* Sets the plus/minus sign display strategy. Most common values:
*
* <ul>
* <li>Auto: "123", "-123"
* <li>Always: "+123", "-123"
* <li>Accounting: "$123", "($123)"
* </ul>
*
* <p>
* Pass an element from the {@link UNumberSignDisplay} enum to this setter. For example:
*
* <pre>
* NumberFormatter::with().sign(UNumberSignDisplay::UNUM_SIGN_ALWAYS)
* </pre>
*
* <p>
* The default is AUTO sign display.
*
* @param style
* The sign display strategy to use when rendering numbers.
* @return The fluent chain
* @see UNumberSignDisplay
* @stable ICU 60
*/
Derived sign(UNumberSignDisplay style) const &;
/**
* Overload of sign() for use on an rvalue reference.
*
* @param style
* The sign display strategy to use when rendering numbers.
* @return The fluent chain.
* @see #sign
* @stable ICU 62
*/
Derived sign(UNumberSignDisplay style) &&;
/**
* Sets the decimal separator display strategy. This affects integer numbers with no fraction part. Most common
* values:
*
* <ul>
* <li>Auto: "1"
* <li>Always: "1."
* </ul>
*
* <p>
* Pass an element from the {@link UNumberDecimalSeparatorDisplay} enum to this setter. For example:
*
* <pre>
* NumberFormatter::with().decimal(UNumberDecimalSeparatorDisplay::UNUM_DECIMAL_SEPARATOR_ALWAYS)
* </pre>
*
* <p>
* The default is AUTO decimal separator display.
*
* @param style
* The decimal separator display strategy to use when rendering numbers.
* @return The fluent chain
* @see UNumberDecimalSeparatorDisplay
* @stable ICU 60
*/
Derived decimal(UNumberDecimalSeparatorDisplay style) const &;
/**
* Overload of decimal() for use on an rvalue reference.
*
* @param style
* The decimal separator display strategy to use when rendering numbers.
* @return The fluent chain.
* @see #decimal
* @stable ICU 62
*/
Derived decimal(UNumberDecimalSeparatorDisplay style) &&;
/**
* Sets a scale (multiplier) to be used to scale the number by an arbitrary amount before formatting.
* Most common values:
*
* <ul>
* <li>Multiply by 100: useful for percentages.
* <li>Multiply by an arbitrary value: useful for unit conversions.
* </ul>
*
* <p>
* Pass an element from a {@link Scale} factory method to this setter. For example:
*
* <pre>
* NumberFormatter::with().scale(Scale::powerOfTen(2))
* </pre>
*
* <p>
* The default is to not apply any multiplier.
*
* @param scale
* The scale to apply when rendering numbers.
* @return The fluent chain
* @stable ICU 62
*/
Derived scale(const Scale &scale) const &;
/**
* Overload of scale() for use on an rvalue reference.
*
* @param scale
* The scale to apply when rendering numbers.
* @return The fluent chain.
* @see #scale
* @stable ICU 62
*/
Derived scale(const Scale &scale) &&;
#ifndef U_HIDE_INTERNAL_API
/**
* Set the padding strategy. May be added in the future; see #13338.
*
* @internal ICU 60: This API is ICU internal only.
*/
Derived padding(const impl::Padder &padder) const &;
/** @internal */
Derived padding(const impl::Padder &padder) &&;
/**
* Internal fluent setter to support a custom regulation threshold. A threshold of 1 causes the data structures to
* be built right away. A threshold of 0 prevents the data structures from being built.
*
* @internal ICU 60: This API is ICU internal only.
*/
Derived threshold(int32_t threshold) const &;
/** @internal */
Derived threshold(int32_t threshold) &&;
/**
* Internal fluent setter to overwrite the entire macros object.
*
* @internal ICU 60: This API is ICU internal only.
*/
Derived macros(const impl::MacroProps& macros) const &;
/** @internal */
Derived macros(const impl::MacroProps& macros) &&;
/** @internal */
Derived macros(impl::MacroProps&& macros) const &;
/** @internal */
Derived macros(impl::MacroProps&& macros) &&;
#endif /* U_HIDE_INTERNAL_API */
/**
* Creates a skeleton string representation of this number formatter. A skeleton string is a
* locale-agnostic serialized form of a number formatter.
*
* Not all options are capable of being represented in the skeleton string; for example, a
* DecimalFormatSymbols object. If any such option is encountered, the error code is set to
* U_UNSUPPORTED_ERROR.
*
* The returned skeleton is in normalized form, such that two number formatters with equivalent
* behavior should produce the same skeleton.
*
* @return A number skeleton string with behavior corresponding to this number formatter.
* @stable ICU 62
*/
UnicodeString toSkeleton(UErrorCode& status) const;
#ifndef U_HIDE_DRAFT_API
/**
* Returns the current (Un)LocalizedNumberFormatter as a LocalPointer
* wrapping a heap-allocated copy of the current object.
*
* This is equivalent to new-ing the move constructor with a value object
* as the argument.
*
* @return A wrapped (Un)LocalizedNumberFormatter pointer, or a wrapped
* nullptr on failure.
* @draft ICU 64
*/
LocalPointer<Derived> clone() const &;
/**
* Overload of clone for use on an rvalue reference.
*
* @return A wrapped (Un)LocalizedNumberFormatter pointer, or a wrapped
* nullptr on failure.
* @draft ICU 64
*/
LocalPointer<Derived> clone() &&;
#endif /* U_HIDE_DRAFT_API */
/**
* Sets the UErrorCode if an error occurred in the fluent chain.
* Preserves older error codes in the outErrorCode.
* @return TRUE if U_FAILURE(outErrorCode)
* @stable ICU 60
*/
UBool copyErrorTo(UErrorCode &outErrorCode) const {
if (U_FAILURE(outErrorCode)) {
// Do not overwrite the older error code
return TRUE;
}
fMacros.copyErrorTo(outErrorCode);
return U_FAILURE(outErrorCode);
}
// NOTE: Uses default copy and move constructors.
private:
impl::MacroProps fMacros;
// Don't construct me directly! Use (Un)LocalizedNumberFormatter.
NumberFormatterSettings() = default;
friend class LocalizedNumberFormatter;
friend class UnlocalizedNumberFormatter;
// Give NumberRangeFormatter access to the MacroProps
friend void impl::touchRangeLocales(impl::RangeMacroProps& macros);
friend class impl::NumberRangeFormatterImpl;
};
/**
* A NumberFormatter that does not yet have a locale. In order to format numbers, a locale must be specified.
*
* Instances of this class are immutable and thread-safe.
*
* @see NumberFormatter
* @stable ICU 60
*/
class U_I18N_API UnlocalizedNumberFormatter
: public NumberFormatterSettings<UnlocalizedNumberFormatter>, public UMemory {
public:
/**
* Associate the given locale with the number formatter. The locale is used for picking the appropriate symbols,
* formats, and other data for number display.
*
* @param locale
* The locale to use when loading data for number formatting.
* @return The fluent chain.
* @stable ICU 60
*/
LocalizedNumberFormatter locale(const icu::Locale &locale) const &;
/**
* Overload of locale() for use on an rvalue reference.
*
* @param locale
* The locale to use when loading data for number formatting.
* @return The fluent chain.
* @see #locale
* @stable ICU 62
*/
LocalizedNumberFormatter locale(const icu::Locale &locale) &&;
/**
* Default constructor: puts the formatter into a valid but undefined state.
*
* @stable ICU 62
*/
UnlocalizedNumberFormatter() = default;
/**
* Returns a copy of this UnlocalizedNumberFormatter.
* @stable ICU 60
*/
UnlocalizedNumberFormatter(const UnlocalizedNumberFormatter &other);
/**
* Move constructor:
* The source UnlocalizedNumberFormatter will be left in a valid but undefined state.
* @stable ICU 62
*/
UnlocalizedNumberFormatter(UnlocalizedNumberFormatter&& src) U_NOEXCEPT;
/**
* Copy assignment operator.
* @stable ICU 62
*/
UnlocalizedNumberFormatter& operator=(const UnlocalizedNumberFormatter& other);
/**
* Move assignment operator:
* The source UnlocalizedNumberFormatter will be left in a valid but undefined state.
* @stable ICU 62
*/
UnlocalizedNumberFormatter& operator=(UnlocalizedNumberFormatter&& src) U_NOEXCEPT;
private:
explicit UnlocalizedNumberFormatter(const NumberFormatterSettings<UnlocalizedNumberFormatter>& other);
explicit UnlocalizedNumberFormatter(
NumberFormatterSettings<UnlocalizedNumberFormatter>&& src) U_NOEXCEPT;
// To give the fluent setters access to this class's constructor:
friend class NumberFormatterSettings<UnlocalizedNumberFormatter>;
// To give NumberFormatter::with() access to this class's constructor:
friend class NumberFormatter;
};
/**
* A NumberFormatter that has a locale associated with it; this means .format() methods are available.
*
* Instances of this class are immutable and thread-safe.
*
* @see NumberFormatter
* @stable ICU 60
*/
class U_I18N_API LocalizedNumberFormatter
: public NumberFormatterSettings<LocalizedNumberFormatter>, public UMemory {
public:
/**
* Format the given integer number to a string using the settings specified in the NumberFormatter fluent
* setting chain.
*
* @param value
* The number to format.
* @param status
* Set to an ErrorCode if one occurred in the setter chain or during formatting.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
*/
FormattedNumber formatInt(int64_t value, UErrorCode &status) const;
/**
* Format the given float or double to a string using the settings specified in the NumberFormatter fluent setting
* chain.
*
* @param value
* The number to format.
* @param status
* Set to an ErrorCode if one occurred in the setter chain or during formatting.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
*/
FormattedNumber formatDouble(double value, UErrorCode &status) const;
/**
* Format the given decimal number to a string using the settings
* specified in the NumberFormatter fluent setting chain.
* The syntax of the unformatted number is a "numeric string"
* as defined in the Decimal Arithmetic Specification, available at
* http://speleotrove.com/decimal
*
* @param value
* The number to format.
* @param status
* Set to an ErrorCode if one occurred in the setter chain or during formatting.
* @return A FormattedNumber object; call .toString() to get the string.
* @stable ICU 60
*/
FormattedNumber formatDecimal(StringPiece value, UErrorCode& status) const;
#ifndef U_HIDE_INTERNAL_API
/** Internal method.
* @internal
*/
FormattedNumber formatDecimalQuantity(const impl::DecimalQuantity& dq, UErrorCode& status) const;
/** Internal method for DecimalFormat compatibility.
* @internal
*/
void getAffixImpl(bool isPrefix, bool isNegative, UnicodeString& result, UErrorCode& status) const;
/**
* Internal method for testing.
* @internal
*/
const impl::NumberFormatterImpl* getCompiled() const;
/**
* Internal method for testing.
* @internal
*/
int32_t getCallCount() const;
#endif /* U_HIDE_INTERNAL_API */
/**
* Creates a representation of this LocalizedNumberFormat as an icu::Format, enabling the use
* of this number formatter with APIs that need an object of that type, such as MessageFormat.
*
* This API is not intended to be used other than for enabling API compatibility. The formatDouble,
* formatInt, and formatDecimal methods should normally be used when formatting numbers, not the Format
* object returned by this method.
*
* The caller owns the returned object and must delete it when finished.
*
* @return A Format wrapping this LocalizedNumberFormatter.
* @stable ICU 62
*/
Format* toFormat(UErrorCode& status) const;
/**
* Default constructor: puts the formatter into a valid but undefined state.
*
* @stable ICU 62
*/
LocalizedNumberFormatter() = default;
/**
* Returns a copy of this LocalizedNumberFormatter.
* @stable ICU 60
*/
LocalizedNumberFormatter(const LocalizedNumberFormatter &other);
/**
* Move constructor:
* The source LocalizedNumberFormatter will be left in a valid but undefined state.
* @stable ICU 62
*/
LocalizedNumberFormatter(LocalizedNumberFormatter&& src) U_NOEXCEPT;
/**
* Copy assignment operator.
* @stable ICU 62
*/
LocalizedNumberFormatter& operator=(const LocalizedNumberFormatter& other);
/**
* Move assignment operator:
* The source LocalizedNumberFormatter will be left in a valid but undefined state.
* @stable ICU 62
*/
LocalizedNumberFormatter& operator=(LocalizedNumberFormatter&& src) U_NOEXCEPT;
#ifndef U_HIDE_INTERNAL_API
/**
* This is the core entrypoint to the number formatting pipeline. It performs self-regulation: a static code path
* for the first few calls, and compiling a more efficient data structure if called repeatedly.
*
* <p>
* This function is very hot, being called in every call to the number formatting pipeline.
*
* @param results
* The results object. This method will mutate it to save the results.
* @param status
* @internal
*/
void formatImpl(impl::UFormattedNumberData *results, UErrorCode &status) const;
#endif /* U_HIDE_INTERNAL_API */
/**
* Destruct this LocalizedNumberFormatter, cleaning up any memory it might own.
* @stable ICU 60
*/
~LocalizedNumberFormatter();
private:
// Note: fCompiled can't be a LocalPointer because impl::NumberFormatterImpl is defined in an internal
// header, and LocalPointer needs the full class definition in order to delete the instance.
const impl::NumberFormatterImpl* fCompiled {nullptr};
char fUnsafeCallCount[8] {}; // internally cast to u_atomic_int32_t
explicit LocalizedNumberFormatter(const NumberFormatterSettings<LocalizedNumberFormatter>& other);
explicit LocalizedNumberFormatter(NumberFormatterSettings<LocalizedNumberFormatter>&& src) U_NOEXCEPT;
LocalizedNumberFormatter(const impl::MacroProps ¯os, const Locale &locale);
LocalizedNumberFormatter(impl::MacroProps &¯os, const Locale &locale);
void clear();
void lnfMoveHelper(LocalizedNumberFormatter&& src);
/**
* @return true if the compiled formatter is available.
*/
bool computeCompiled(UErrorCode& status) const;
// To give the fluent setters access to this class's constructor:
friend class NumberFormatterSettings<UnlocalizedNumberFormatter>;
friend class NumberFormatterSettings<LocalizedNumberFormatter>;
// To give UnlocalizedNumberFormatter::locale() access to this class's constructor:
friend class UnlocalizedNumberFormatter;
};
/**
* The result of a number formatting operation. This class allows the result to be exported in several data types,
* including a UnicodeString and a FieldPositionIterator.
*
* Instances of this class are immutable and thread-safe.
*
* @stable ICU 60
*/
class U_I18N_API FormattedNumber : public UMemory, public FormattedValue {
public:
// Default constructor cannot have #ifndef U_HIDE_DRAFT_API
#ifndef U_FORCE_HIDE_DRAFT_API
/**
* Default constructor; makes an empty FormattedNumber.
* @draft ICU 64
*/
FormattedNumber()
: fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}
#endif // U_FORCE_HIDE_DRAFT_API
/**
* Move constructor: Leaves the source FormattedNumber in an undefined state.
* @stable ICU 62
*/
FormattedNumber(FormattedNumber&& src) U_NOEXCEPT;
/**
* Destruct an instance of FormattedNumber.
* @stable ICU 60
*/
virtual ~FormattedNumber() U_OVERRIDE;
/** Copying not supported; use move constructor instead. */
FormattedNumber(const FormattedNumber&) = delete;
/** Copying not supported; use move assignment instead. */
FormattedNumber& operator=(const FormattedNumber&) = delete;
/**
* Move assignment: Leaves the source FormattedNumber in an undefined state.
* @stable ICU 62
*/
FormattedNumber& operator=(FormattedNumber&& src) U_NOEXCEPT;
// Copybrief: this method is older than the parent method
/**
* @copybrief FormattedValue::toString()
*
* For more information, see FormattedValue::toString()
*
* @stable ICU 62
*/
UnicodeString toString(UErrorCode& status) const U_OVERRIDE;
// Copydoc: this method is new in ICU 64
/** @copydoc FormattedValue::toTempString() */
UnicodeString toTempString(UErrorCode& status) const U_OVERRIDE;
// Copybrief: this method is older than the parent method
/**
* @copybrief FormattedValue::appendTo()
*
* For more information, see FormattedValue::appendTo()
*
* @stable ICU 62
*/
Appendable &appendTo(Appendable& appendable, UErrorCode& status) const U_OVERRIDE;
// Copydoc: this method is new in ICU 64
/** @copydoc FormattedValue::nextPosition() */
UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const U_OVERRIDE;
#ifndef U_HIDE_DRAFT_API
/**
* Determines the start (inclusive) and end (exclusive) 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 #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>
* FieldPosition fpos(UNUM_GROUPING_SEPARATOR_FIELD);
* while (formattedNumber.nextFieldPosition(fpos, status)) {
* // do something with fpos.
* }
* </pre>
*
* This method is useful if you know which field to query. If you want all available field position
* information, use {@link #nextPosition} or {@link #getAllFieldPositions}.
*
* @param fieldPosition
* Input+output variable. On input, the "field" property determines which field to look
* up, and the "beginIndex" and "endIndex" properties determine where to begin the search.
* On output, the "beginIndex" is set to the beginning of the first occurrence of the
* field with either begin or end indices after the input indices; "endIndex" is set to
* the end of that occurrence of the field (exclusive index). If a field position is not
* found, the method returns FALSE and the FieldPosition may or may not be changed.
* @param status
* Set if an error occurs while populating the FieldPosition.
* @return TRUE if a new occurrence of the field was found; FALSE otherwise.
* @draft ICU 62
* @see UNumberFormatFields
*/
UBool nextFieldPosition(FieldPosition& fieldPosition, UErrorCode& status) const;
/**
* Export the formatted number to a FieldPositionIterator. This allows you to determine which characters in
* the output string correspond to which <em>fields</em>, such as the integer part, fraction part, and sign.
*
* This is an alternative to the more powerful #nextPosition() API.
*
* If information on only one field is needed, use #nextPosition() or #nextFieldPosition() instead.
*
* @param iterator
* The FieldPositionIterator to populate with all of the fields present in the formatted number.
* @param status
* Set if an error occurs while populating the FieldPositionIterator.
* @draft ICU 62
* @see UNumberFormatFields
*/
void getAllFieldPositions(FieldPositionIterator &iterator, UErrorCode &status) const;
#endif /* U_HIDE_DRAFT_API */
#ifndef U_HIDE_DRAFT_API
/**
* Export 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.
*
* Example call site:
*
* auto decimalNumber = fn.toDecimalNumber<std::string>(status);
*
* @tparam StringClass A string class compatible with StringByteSink;
* for example, std::string.
* @param status Set if an error occurs.
* @return A StringClass containing the numeric string.
* @draft ICU 65
*/
template<typename StringClass>
inline StringClass toDecimalNumber(UErrorCode& status) const;
#endif // U_HIDE_DRAFT_API
#ifndef U_HIDE_INTERNAL_API
/**
* Gets the raw DecimalQuantity for plural rule selection.
* @internal
*/
void getDecimalQuantity(impl::DecimalQuantity& output, UErrorCode& status) const;
/**
* Populates the mutable builder type FieldPositionIteratorHandler.
* @internal
*/
void getAllFieldPositionsImpl(FieldPositionIteratorHandler& fpih, UErrorCode& status) const;
#endif /* U_HIDE_INTERNAL_API */
private:
// Can't use LocalPointer because UFormattedNumberData is forward-declared
const impl::UFormattedNumberData *fData;
// Error code for the terminal methods
UErrorCode fErrorCode;
/**
* Internal constructor from data type. Adopts the data pointer.
* @internal
*/
explicit FormattedNumber(impl::UFormattedNumberData *results)
: fData(results), fErrorCode(U_ZERO_ERROR) {}
explicit FormattedNumber(UErrorCode errorCode)
: fData(nullptr), fErrorCode(errorCode) {}
// TODO(ICU-20775): Propose this as API.
void toDecimalNumber(ByteSink& sink, UErrorCode& status) const;
// To give LocalizedNumberFormatter format methods access to this class's constructor:
friend class LocalizedNumberFormatter;
// To give C API access to internals
friend struct impl::UFormattedNumberImpl;
};
#ifndef U_HIDE_DRAFT_API
// Note: This is draft ICU 65
template<typename StringClass>
StringClass FormattedNumber::toDecimalNumber(UErrorCode& status) const {
StringClass result;
StringByteSink<StringClass> sink(&result);
toDecimalNumber(sink, status);
return result;
};
#endif // U_HIDE_DRAFT_API
/**
* See the main description in numberformatter.h for documentation and examples.
*
* @stable ICU 60
*/
class U_I18N_API NumberFormatter final {
public:
/**
* Call this method at the beginning of a NumberFormatter fluent chain in which the locale is not currently known at
* the call site.
*
* @return An {@link UnlocalizedNumberFormatter}, to be used for chaining.
* @stable ICU 60
*/
static UnlocalizedNumberFormatter with();
/**
* Call this method at the beginning of a NumberFormatter fluent chain in which the locale is known at the call
* site.
*
* @param locale
* The locale from which to load formats and symbols for number formatting.
* @return A {@link LocalizedNumberFormatter}, to be used for chaining.
* @stable ICU 60
*/
static LocalizedNumberFormatter withLocale(const Locale &locale);
/**
* Call this method at the beginning of a NumberFormatter fluent chain to create an instance based
* on a given number skeleton string.
*
* It is possible for an error to occur while parsing. See the overload of this method if you are
* interested in the location of a possible parse error.
*
* @param skeleton
* The skeleton string off of which to base this NumberFormatter.
* @param status
* Set to U_NUMBER_SKELETON_SYNTAX_ERROR if the skeleton was invalid.
* @return An UnlocalizedNumberFormatter, to be used for chaining.
* @stable ICU 62
*/
static UnlocalizedNumberFormatter forSkeleton(const UnicodeString& skeleton, UErrorCode& status);
#ifndef U_HIDE_DRAFT_API
/**
* Call this method at the beginning of a NumberFormatter fluent chain to create an instance based
* on a given number skeleton string.
*
* If an error occurs while parsing the skeleton string, the offset into the skeleton string at
* which the error occurred will be saved into the UParseError, if provided.
*
* @param skeleton
* The skeleton string off of which to base this NumberFormatter.
* @param perror
* A parse error struct populated if an error occurs when parsing.
* If no error occurs, perror.offset will be set to -1.
* @param status
* Set to U_NUMBER_SKELETON_SYNTAX_ERROR if the skeleton was invalid.
* @return An UnlocalizedNumberFormatter, to be used for chaining.
* @draft ICU 64
*/
static UnlocalizedNumberFormatter forSkeleton(const UnicodeString& skeleton,
UParseError& perror, UErrorCode& status);
#endif
/**
* Use factory methods instead of the constructor to create a NumberFormatter.
*/
NumberFormatter() = delete;
};
} // namespace number
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // __NUMBERFORMATTER_H__