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// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
#ifndef __NUMBERRANGEFORMATTER_H__
#define __NUMBERRANGEFORMATTER_H__
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
#if !UCONFIG_NO_FORMATTING
#include <atomic>
#include "unicode/appendable.h"
#include "unicode/fieldpos.h"
#include "unicode/formattedvalue.h"
#include "unicode/fpositer.h"
#include "unicode/numberformatter.h"
#include "unicode/unumberrangeformatter.h"
/**
* \file
* \brief C++ API: Library for localized formatting of number, currency, and unit ranges.
*
* The main entrypoint to the formatting of ranges of numbers, including currencies and other units of measurement.
* <p>
* Usage example:
* <p>
* <pre>
* NumberRangeFormatter::with()
* .identityFallback(UNUM_IDENTITY_FALLBACK_APPROXIMATELY_OR_SINGLE_VALUE)
* .numberFormatterFirst(NumberFormatter::with().adoptUnit(MeasureUnit::createMeter()))
* .numberFormatterSecond(NumberFormatter::with().adoptUnit(MeasureUnit::createKilometer()))
* .locale("en-GB")
* .formatFormattableRange(750, 1.2, status)
* .toString(status);
* // => "750 m - 1.2 km"
* </pre>
* <p>
* Like NumberFormatter, NumberRangeFormatter instances (i.e., LocalizedNumberRangeFormatter
* and UnlocalizedNumberRangeFormatter) are immutable and thread-safe. This API is based on the
* <em>fluent</em> design pattern popularized by libraries such as Google's Guava.
*
* @author Shane Carr
*/
U_NAMESPACE_BEGIN
// Forward declarations:
class PluralRules;
namespace number { // icu::number
// Forward declarations:
class UnlocalizedNumberRangeFormatter;
class LocalizedNumberRangeFormatter;
class FormattedNumberRange;
namespace impl {
// Forward declarations:
struct RangeMacroProps;
class DecimalQuantity;
class UFormattedNumberRangeData;
class NumberRangeFormatterImpl;
struct UFormattedNumberRangeImpl;
} // namespace impl
/**
* \cond
* Export an explicit template instantiation. See datefmt.h
* (When building DLLs for Windows this is required.)
*/
#if U_PLATFORM == U_PF_WINDOWS && !defined(U_IN_DOXYGEN) && !defined(U_STATIC_IMPLEMENTATION)
} // namespace icu::number
U_NAMESPACE_END
template struct U_I18N_API std::atomic< U_NAMESPACE_QUALIFIER number::impl::NumberRangeFormatterImpl*>;
U_NAMESPACE_BEGIN
namespace number { // icu::number
#endif
/** \endcond */
// Other helper classes would go here, but there are none.
namespace impl { // icu::number::impl
// Do not enclose entire MacroProps with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
struct U_I18N_API RangeMacroProps : public UMemory {
/** @internal */
UnlocalizedNumberFormatter formatter1; // = NumberFormatter::with();
/** @internal */
UnlocalizedNumberFormatter formatter2; // = NumberFormatter::with();
/** @internal */
bool singleFormatter = true;
/** @internal */
UNumberRangeCollapse collapse = UNUM_RANGE_COLLAPSE_AUTO;
/** @internal */
UNumberRangeIdentityFallback identityFallback = UNUM_IDENTITY_FALLBACK_APPROXIMATELY;
/** @internal */
Locale locale;
// NOTE: Uses default copy and move constructors.
/**
* Check all members for errors.
* @internal
*/
bool copyErrorTo(UErrorCode &status) const {
return formatter1.copyErrorTo(status) || formatter2.copyErrorTo(status);
}
};
} // namespace impl
/**
* An abstract base class for specifying settings related to number formatting. This class is implemented by
* {@link UnlocalizedNumberRangeFormatter} and {@link LocalizedNumberRangeFormatter}. This class is not intended for
* public subclassing.
*/
template<typename Derived>
class U_I18N_API NumberRangeFormatterSettings {
public:
/**
* Sets the NumberFormatter instance to use for the numbers in the range. The same formatter is applied to both
* sides of the range.
* <p>
* The NumberFormatter instances must not have a locale applied yet; the locale specified on the
* NumberRangeFormatter will be used.
*
* @param formatter
* The formatter to use for both numbers in the range.
* @return The fluent chain.
* @stable ICU 63
*/
Derived numberFormatterBoth(const UnlocalizedNumberFormatter &formatter) const &;
/**
* Overload of numberFormatterBoth() for use on an rvalue reference.
*
* @param formatter
* The formatter to use for both numbers in the range.
* @return The fluent chain.
* @see #numberFormatterBoth
* @stable ICU 63
*/
Derived numberFormatterBoth(const UnlocalizedNumberFormatter &formatter) &&;
/**
* Overload of numberFormatterBoth() for use on an rvalue reference.
*
* @param formatter
* The formatter to use for both numbers in the range.
* @return The fluent chain.
* @see #numberFormatterBoth
* @stable ICU 63
*/
Derived numberFormatterBoth(UnlocalizedNumberFormatter &&formatter) const &;
/**
* Overload of numberFormatterBoth() for use on an rvalue reference.
*
* @param formatter
* The formatter to use for both numbers in the range.
* @return The fluent chain.
* @see #numberFormatterBoth
* @stable ICU 63
*/
Derived numberFormatterBoth(UnlocalizedNumberFormatter &&formatter) &&;
/**
* Sets the NumberFormatter instance to use for the first number in the range.
* <p>
* The NumberFormatter instances must not have a locale applied yet; the locale specified on the
* NumberRangeFormatter will be used.
*
* @param formatterFirst
* The formatter to use for the first number in the range.
* @return The fluent chain.
* @stable ICU 63
*/
Derived numberFormatterFirst(const UnlocalizedNumberFormatter &formatterFirst) const &;
/**
* Overload of numberFormatterFirst() for use on an rvalue reference.
*
* @param formatterFirst
* The formatter to use for the first number in the range.
* @return The fluent chain.
* @see #numberFormatterFirst
* @stable ICU 63
*/
Derived numberFormatterFirst(const UnlocalizedNumberFormatter &formatterFirst) &&;
/**
* Overload of numberFormatterFirst() for use on an rvalue reference.
*
* @param formatterFirst
* The formatter to use for the first number in the range.
* @return The fluent chain.
* @see #numberFormatterFirst
* @stable ICU 63
*/
Derived numberFormatterFirst(UnlocalizedNumberFormatter &&formatterFirst) const &;
/**
* Overload of numberFormatterFirst() for use on an rvalue reference.
*
* @param formatterFirst
* The formatter to use for the first number in the range.
* @return The fluent chain.
* @see #numberFormatterFirst
* @stable ICU 63
*/
Derived numberFormatterFirst(UnlocalizedNumberFormatter &&formatterFirst) &&;
/**
* Sets the NumberFormatter instance to use for the second number in the range.
* <p>
* The NumberFormatter instances must not have a locale applied yet; the locale specified on the
* NumberRangeFormatter will be used.
*
* @param formatterSecond
* The formatter to use for the second number in the range.
* @return The fluent chain.
* @stable ICU 63
*/
Derived numberFormatterSecond(const UnlocalizedNumberFormatter &formatterSecond) const &;
/**
* Overload of numberFormatterSecond() for use on an rvalue reference.
*
* @param formatterSecond
* The formatter to use for the second number in the range.
* @return The fluent chain.
* @see #numberFormatterSecond
* @stable ICU 63
*/
Derived numberFormatterSecond(const UnlocalizedNumberFormatter &formatterSecond) &&;
/**
* Overload of numberFormatterSecond() for use on an rvalue reference.
*
* @param formatterSecond
* The formatter to use for the second number in the range.
* @return The fluent chain.
* @see #numberFormatterSecond
* @stable ICU 63
*/
Derived numberFormatterSecond(UnlocalizedNumberFormatter &&formatterSecond) const &;
/**
* Overload of numberFormatterSecond() for use on an rvalue reference.
*
* @param formatterSecond
* The formatter to use for the second number in the range.
* @return The fluent chain.
* @see #numberFormatterSecond
* @stable ICU 63
*/
Derived numberFormatterSecond(UnlocalizedNumberFormatter &&formatterSecond) &&;
/**
* Sets the aggressiveness of "collapsing" fields across the range separator. Possible values:
* <p>
* <ul>
* <li>ALL: "3-5K miles"</li>
* <li>UNIT: "3K - 5K miles"</li>
* <li>NONE: "3K miles - 5K miles"</li>
* <li>AUTO: usually UNIT or NONE, depending on the locale and formatter settings</li>
* </ul>
* <p>
* The default value is AUTO.
*
* @param collapse
* The collapsing strategy to use for this range.
* @return The fluent chain.
* @stable ICU 63
*/
Derived collapse(UNumberRangeCollapse collapse) const &;
/**
* Overload of collapse() for use on an rvalue reference.
*
* @param collapse
* The collapsing strategy to use for this range.
* @return The fluent chain.
* @see #collapse
* @stable ICU 63
*/
Derived collapse(UNumberRangeCollapse collapse) &&;
/**
* Sets the behavior when the two sides of the range are the same. This could happen if the same two numbers are
* passed to the formatFormattableRange function, or if different numbers are passed to the function but they
* become the same after rounding rules are applied. Possible values:
* <p>
* <ul>
* <li>SINGLE_VALUE: "5 miles"</li>
* <li>APPROXIMATELY_OR_SINGLE_VALUE: "~5 miles" or "5 miles", depending on whether the number was the same before
* rounding was applied</li>
* <li>APPROXIMATELY: "~5 miles"</li>
* <li>RANGE: "5-5 miles" (with collapse=UNIT)</li>
* </ul>
* <p>
* The default value is APPROXIMATELY.
*
* @param identityFallback
* The strategy to use when formatting two numbers that end up being the same.
* @return The fluent chain.
* @stable ICU 63
*/
Derived identityFallback(UNumberRangeIdentityFallback identityFallback) const &;
/**
* Overload of identityFallback() for use on an rvalue reference.
*
* @param identityFallback
* The strategy to use when formatting two numbers that end up being the same.
* @return The fluent chain.
* @see #identityFallback
* @stable ICU 63
*/
Derived identityFallback(UNumberRangeIdentityFallback identityFallback) &&;
/**
* Returns the current (Un)LocalizedNumberRangeFormatter 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)LocalizedNumberRangeFormatter pointer, or a wrapped
* nullptr on failure.
* @stable ICU 64
*/
LocalPointer<Derived> clone() const &;
/**
* Overload of clone for use on an rvalue reference.
*
* @return A wrapped (Un)LocalizedNumberRangeFormatter pointer, or a wrapped
* nullptr on failure.
* @stable ICU 64
*/
LocalPointer<Derived> clone() &&;
/**
* 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 63
*/
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::RangeMacroProps fMacros;
// Don't construct me directly! Use (Un)LocalizedNumberFormatter.
NumberRangeFormatterSettings() = default;
friend class LocalizedNumberRangeFormatter;
friend class UnlocalizedNumberRangeFormatter;
};
// Explicit instantiations in source/i18n/numrange_fluent.cpp.
// (MSVC treats imports/exports of explicit instantiations differently.)
#ifndef _MSC_VER
extern template class NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>;
extern template class NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>;
#endif
/**
* A NumberRangeFormatter that does not yet have a locale. In order to format, a locale must be specified.
*
* Instances of this class are immutable and thread-safe.
*
* @see NumberRangeFormatter
* @stable ICU 63
*/
class U_I18N_API UnlocalizedNumberRangeFormatter
: public NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>, public UMemory {
public:
/**
* Associate the given locale with the number range 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 63
*/
LocalizedNumberRangeFormatter 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 63
*/
LocalizedNumberRangeFormatter locale(const icu::Locale &locale) &&;
/**
* Default constructor: puts the formatter into a valid but undefined state.
*
* @stable ICU 63
*/
UnlocalizedNumberRangeFormatter() = default;
/**
* Returns a copy of this UnlocalizedNumberRangeFormatter.
* @stable ICU 63
*/
UnlocalizedNumberRangeFormatter(const UnlocalizedNumberRangeFormatter &other);
/**
* Move constructor:
* The source UnlocalizedNumberRangeFormatter will be left in a valid but undefined state.
* @stable ICU 63
*/
UnlocalizedNumberRangeFormatter(UnlocalizedNumberRangeFormatter&& src) noexcept;
/**
* Copy assignment operator.
* @stable ICU 63
*/
UnlocalizedNumberRangeFormatter& operator=(const UnlocalizedNumberRangeFormatter& other);
/**
* Move assignment operator:
* The source UnlocalizedNumberRangeFormatter will be left in a valid but undefined state.
* @stable ICU 63
*/
UnlocalizedNumberRangeFormatter& operator=(UnlocalizedNumberRangeFormatter&& src) noexcept;
private:
explicit UnlocalizedNumberRangeFormatter(
const NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>& other);
explicit UnlocalizedNumberRangeFormatter(
NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>&& src) noexcept;
// To give the fluent setters access to this class's constructor:
friend class NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>;
// To give NumberRangeFormatter::with() access to this class's constructor:
friend class NumberRangeFormatter;
};
/**
* A NumberRangeFormatter that has a locale associated with it; this means .formatRange() methods are available.
*
* Instances of this class are immutable and thread-safe.
*
* @see NumberFormatter
* @stable ICU 63
*/
class U_I18N_API LocalizedNumberRangeFormatter
: public NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>, public UMemory {
public:
/**
* Format the given Formattables to a string using the settings specified in the NumberRangeFormatter fluent setting
* chain.
*
* @param first
* The first number in the range, usually to the left in LTR locales.
* @param second
* The second number in the range, usually to the right in LTR locales.
* @param status
* Set if an error occurs while formatting.
* @return A FormattedNumberRange object; call .toString() to get the string.
* @stable ICU 63
*/
FormattedNumberRange formatFormattableRange(
const Formattable& first, const Formattable& second, UErrorCode& status) const;
/**
* Default constructor: puts the formatter into a valid but undefined state.
*
* @stable ICU 63
*/
LocalizedNumberRangeFormatter() = default;
/**
* Returns a copy of this LocalizedNumberRangeFormatter.
* @stable ICU 63
*/
LocalizedNumberRangeFormatter(const LocalizedNumberRangeFormatter &other);
/**
* Move constructor:
* The source LocalizedNumberRangeFormatter will be left in a valid but undefined state.
* @stable ICU 63
*/
LocalizedNumberRangeFormatter(LocalizedNumberRangeFormatter&& src) noexcept;
/**
* Copy assignment operator.
* @stable ICU 63
*/
LocalizedNumberRangeFormatter& operator=(const LocalizedNumberRangeFormatter& other);
/**
* Move assignment operator:
* The source LocalizedNumberRangeFormatter will be left in a valid but undefined state.
* @stable ICU 63
*/
LocalizedNumberRangeFormatter& operator=(LocalizedNumberRangeFormatter&& src) noexcept;
#ifndef U_HIDE_INTERNAL_API
/**
* @param results
* The results object. This method will mutate it to save the results.
* @param equalBeforeRounding
* Whether the number was equal before copying it into a DecimalQuantity.
* Used for determining the identity fallback behavior.
* @param status
* Set if an error occurs while formatting.
* @internal
*/
void formatImpl(impl::UFormattedNumberRangeData& results, bool equalBeforeRounding,
UErrorCode& status) const;
#endif /* U_HIDE_INTERNAL_API */
/**
* Destruct this LocalizedNumberRangeFormatter, cleaning up any memory it might own.
* @stable ICU 63
*/
~LocalizedNumberRangeFormatter();
private:
std::atomic<impl::NumberRangeFormatterImpl*> fAtomicFormatter = {};
const impl::NumberRangeFormatterImpl* getFormatter(UErrorCode& stauts) const;
explicit LocalizedNumberRangeFormatter(
const NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>& other);
explicit LocalizedNumberRangeFormatter(
NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>&& src) noexcept;
LocalizedNumberRangeFormatter(const impl::RangeMacroProps ¯os, const Locale &locale);
LocalizedNumberRangeFormatter(impl::RangeMacroProps &¯os, const Locale &locale);
// To give the fluent setters access to this class's constructor:
friend class NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>;
friend class NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>;
// To give UnlocalizedNumberRangeFormatter::locale() access to this class's constructor:
friend class UnlocalizedNumberRangeFormatter;
};
/**
* The result of a number range 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 63
*/
class U_I18N_API FormattedNumberRange : public UMemory, public FormattedValue {
public:
// Copybrief: this method is older than the parent method
/**
* @copybrief FormattedValue::toString()
*
* For more information, see FormattedValue::toString()
*
* @stable ICU 63
*/
UnicodeString toString(UErrorCode& status) const override;
// Copydoc: this method is new in ICU 64
/** @copydoc FormattedValue::toTempString() */
UnicodeString toTempString(UErrorCode& status) const override;
// Copybrief: this method is older than the parent method
/**
* @copybrief FormattedValue::appendTo()
*
* For more information, see FormattedValue::appendTo()
*
* @stable ICU 63
*/
Appendable &appendTo(Appendable &appendable, UErrorCode& status) const override;
// Copydoc: this method is new in ICU 64
/** @copydoc FormattedValue::nextPosition() */
UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const override;
/**
* Extracts the formatted range as a pair of decimal numbers. This endpoint
* is useful for obtaining the exact number being printed after scaling
* and rounding have been applied by the number range formatting pipeline.
*
* The syntax of the unformatted numbers is a "numeric string"
* as defined in the Decimal Arithmetic Specification, available at
* http://speleotrove.com/decimal
*
* Example C++17 call site:
*
* auto [ first, second ] = range.getDecimalNumbers<std::string>(status);
*
* @tparam StringClass A string class compatible with StringByteSink;
* for example, std::string.
* @param status Set if an error occurs.
* @return A pair of StringClasses containing the numeric strings.
* @stable ICU 68
*/
template<typename StringClass>
inline std::pair<StringClass, StringClass> getDecimalNumbers(UErrorCode& status) const;
/**
* Returns whether the pair of numbers was successfully formatted as a range or whether an identity fallback was
* used. For example, if the first and second number were the same either before or after rounding occurred, an
* identity fallback was used.
*
* @return An indication the resulting identity situation in the formatted number range.
* @stable ICU 63
* @see UNumberRangeIdentityFallback
*/
UNumberRangeIdentityResult getIdentityResult(UErrorCode& status) const;
/**
* Default constructor; makes an empty FormattedNumberRange.
* @stable ICU 70
*/
FormattedNumberRange()
: fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}
/**
* Copying not supported; use move constructor instead.
*/
FormattedNumberRange(const FormattedNumberRange&) = delete;
/**
* Copying not supported; use move assignment instead.
*/
FormattedNumberRange& operator=(const FormattedNumberRange&) = delete;
/**
* Move constructor:
* Leaves the source FormattedNumberRange in an undefined state.
* @stable ICU 63
*/
FormattedNumberRange(FormattedNumberRange&& src) noexcept;
/**
* Move assignment:
* Leaves the source FormattedNumberRange in an undefined state.
* @stable ICU 63
*/
FormattedNumberRange& operator=(FormattedNumberRange&& src) noexcept;
/**
* Destruct an instance of FormattedNumberRange, cleaning up any memory it might own.
* @stable ICU 63
*/
~FormattedNumberRange();
private:
// Can't use LocalPointer because UFormattedNumberRangeData is forward-declared
const impl::UFormattedNumberRangeData *fData;
// Error code for the terminal methods
UErrorCode fErrorCode;
/**
* Internal constructor from data type. Adopts the data pointer.
*/
explicit FormattedNumberRange(impl::UFormattedNumberRangeData *results)
: fData(results), fErrorCode(U_ZERO_ERROR) {}
explicit FormattedNumberRange(UErrorCode errorCode)
: fData(nullptr), fErrorCode(errorCode) {}
void getDecimalNumbers(ByteSink& sink1, ByteSink& sink2, UErrorCode& status) const;
const impl::UFormattedNumberRangeData* getData(UErrorCode& status) const;
// To allow PluralRules to access the underlying data
friend class ::icu::PluralRules;
// To give LocalizedNumberRangeFormatter format methods access to this class's constructor:
friend class LocalizedNumberRangeFormatter;
// To give C API access to internals
friend struct impl::UFormattedNumberRangeImpl;
};
// inline impl of @stable ICU 68 method
template<typename StringClass>
std::pair<StringClass, StringClass> FormattedNumberRange::getDecimalNumbers(UErrorCode& status) const {
StringClass str1;
StringClass str2;
StringByteSink<StringClass> sink1(&str1);
StringByteSink<StringClass> sink2(&str2);
getDecimalNumbers(sink1, sink2, status);
return std::make_pair(str1, str2);
}
/**
* See the main description in numberrangeformatter.h for documentation and examples.
*
* @stable ICU 63
*/
class U_I18N_API NumberRangeFormatter final {
public:
/**
* Call this method at the beginning of a NumberRangeFormatter fluent chain in which the locale is not currently
* known at the call site.
*
* @return An {@link UnlocalizedNumberRangeFormatter}, to be used for chaining.
* @stable ICU 63
*/
static UnlocalizedNumberRangeFormatter with();
/**
* Call this method at the beginning of a NumberRangeFormatter 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 range formatting.
* @return A {@link LocalizedNumberRangeFormatter}, to be used for chaining.
* @stable ICU 63
*/
static LocalizedNumberRangeFormatter withLocale(const Locale &locale);
/**
* Use factory methods instead of the constructor to create a NumberFormatter.
*/
NumberRangeFormatter() = delete;
};
} // namespace number
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // __NUMBERRANGEFORMATTER_H__