* Usage example: *
*
* 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")
* .formatRange(750, 1.2, status)
* .toString(status);
* // => "750 m - 1.2 km"
*
*
* Like NumberFormatter, NumberRangeFormatter instances (i.e., LocalizedNumberRangeFormatter
* and UnlocalizedNumberRangeFormatter) are immutable and thread-safe. This API is based on the
* fluent design pattern popularized by libraries such as Google's Guava.
*
* @author Shane Carr
*/
/**
* Defines how to merge fields that are identical across the range sign.
*
* @draft ICU 63
*/
typedef enum UNumberRangeCollapse {
/**
* Use locale data and heuristics to determine how much of the string to collapse. Could end up collapsing none,
* some, or all repeated pieces in a locale-sensitive way.
*
* The heuristics used for this option are subject to change over time.
*
* @draft ICU 63
*/
UNUM_RANGE_COLLAPSE_AUTO,
/**
* Do not collapse any part of the number. Example: "3.2 thousand kilograms – 5.3 thousand kilograms"
*
* @draft ICU 63
*/
UNUM_RANGE_COLLAPSE_NONE,
/**
* Collapse the unit part of the number, but not the notation, if present. Example: "3.2 thousand – 5.3 thousand
* kilograms"
*
* @draft ICU 63
*/
UNUM_RANGE_COLLAPSE_UNIT,
/**
* Collapse any field that is equal across the range sign. May introduce ambiguity on the magnitude of the
* number. Example: "3.2 – 5.3 thousand kilograms"
*
* @draft ICU 63
*/
UNUM_RANGE_COLLAPSE_ALL
} UNumberRangeCollapse;
/**
* Defines the behavior when the two numbers in the range are identical after rounding. To programmatically detect
* when the identity fallback is used, compare the lower and upper BigDecimals via FormattedNumber.
*
* @draft ICU 63
* @see NumberRangeFormatter
*/
typedef enum UNumberRangeIdentityFallback {
/**
* Show the number as a single value rather than a range. Example: "$5"
*
* @draft ICU 63
*/
UNUM_IDENTITY_FALLBACK_SINGLE_VALUE,
/**
* Show the number using a locale-sensitive approximation pattern. If the numbers were the same before rounding,
* show the single value. Example: "~$5" or "$5"
*
* @draft ICU 63
*/
UNUM_IDENTITY_FALLBACK_APPROXIMATELY_OR_SINGLE_VALUE,
/**
* Show the number using a locale-sensitive approximation pattern. Use the range pattern always, even if the
* inputs are the same. Example: "~$5"
*
* @draft ICU 63
*/
UNUM_IDENTITY_FALLBACK_APPROXIMATELY,
/**
* Show the number as the range of two equal values. Use the range pattern always, even if the inputs are the
* same. Example (with RangeCollapse.NONE): "$5 – $5"
*
* @draft ICU 63
*/
UNUM_IDENTITY_FALLBACK_RANGE
} UNumberRangeIdentityFallback;
/**
* Used in the result class FormattedNumberRange to indicate to the user whether the numbers formatted in the range
* were equal or not, and whether or not the identity fallback was applied.
*
* @draft ICU 63
* @see NumberRangeFormatter
*/
typedef enum UNumberRangeIdentityResult {
/**
* Used to indicate that the two numbers in the range were equal, even before any rounding rules were applied.
*
* @draft ICU 63
* @see NumberRangeFormatter
*/
UNUM_IDENTITY_RESULT_EQUAL_BEFORE_ROUNDING,
/**
* Used to indicate that the two numbers in the range were equal, but only after rounding rules were applied.
*
* @draft ICU 63
* @see NumberRangeFormatter
*/
UNUM_IDENTITY_RESULT_EQUAL_AFTER_ROUNDING,
/**
* Used to indicate that the two numbers in the range were not equal, even after rounding rules were applied.
*
* @draft ICU 63
* @see NumberRangeFormatter
*/
UNUM_IDENTITY_RESULT_NOT_EQUAL,
#ifndef U_HIDE_INTERNAL_API
/**
* The number of entries in this enum.
* @internal
*/
UNUM_IDENTITY_RESULT_COUNT
#endif
} UNumberRangeIdentityResult;
U_NAMESPACE_BEGIN
namespace number { // icu::number
// Forward declarations:
class UnlocalizedNumberRangeFormatter;
class LocalizedNumberRangeFormatter;
class FormattedNumberRange;
namespace impl {
// Forward declarations:
struct RangeMacroProps;
class DecimalQuantity;
class UFormattedNumberRangeData;
class NumberRangeFormatterImpl;
} // 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)
} // 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
* 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.
* @draft 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
* @draft 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
* @draft 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
* @draft ICU 63
*/
Derived numberFormatterBoth(UnlocalizedNumberFormatter &&formatter) &&;
/**
* Sets the NumberFormatter instance to use for the first number in the range.
*
* 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.
* @draft 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
* @draft 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
* @draft 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
* @draft ICU 63
*/
Derived numberFormatterFirst(UnlocalizedNumberFormatter &&formatterFirst) &&;
/**
* Sets the NumberFormatter instance to use for the second number in the range.
*
* 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.
* @draft 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
* @draft 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
* @draft 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
* @draft ICU 63
*/
Derived numberFormatterSecond(UnlocalizedNumberFormatter &&formatterSecond) &&;
/**
* Sets the aggressiveness of "collapsing" fields across the range separator. Possible values:
*
*
* The default value is AUTO.
*
* @param collapse
* The collapsing strategy to use for this range.
* @return The fluent chain.
* @draft 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
* @draft 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 formatRange function, or if different numbers are passed to the function but they become the same
* after rounding rules are applied. Possible values:
*
*
* 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.
* @draft 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
* @draft 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.
* @draft ICU 64
*/
LocalPointer
*
*
*
*
* FieldPosition fpos(UNUM_INTEGER_FIELD);
* while (formattedNumberRange.nextFieldPosition(fpos, status)) {
* // do something with fpos.
* }
*
*
* This method is useful if you know which field to query. If you want all available field position
* information, use #getAllFieldPositions().
*
* @param fieldPosition
* Input+output variable. See {@link FormattedNumber#nextFieldPosition}.
* @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 63
* @see UNumberFormatFields
*/
UBool nextFieldPosition(FieldPosition& fieldPosition, UErrorCode& status) const;
/**
* Export the formatted number range to a FieldPositionIterator. This allows you to determine which characters in
* the output string correspond to which fields, such as the integer part, fraction part, and sign.
*
* If information on only one field is needed, use #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 63
* @see UNumberFormatFields
*/
void getAllFieldPositions(FieldPositionIterator &iterator, UErrorCode &status) const;
/**
* Export the first formatted number as a decimal number. 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 number is a "numeric string"
* as defined in the Decimal Arithmetic Specification, available at
* http://speleotrove.com/decimal
*
* @return A decimal representation of the first formatted number.
* @draft ICU 63
* @see NumberRangeFormatter
* @see #getSecondDecimal
*/
UnicodeString getFirstDecimal(UErrorCode& status) const;
/**
* Export the second formatted number as a decimal number. 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 number is a "numeric string"
* as defined in the Decimal Arithmetic Specification, available at
* http://speleotrove.com/decimal
*
* @return A decimal representation of the second formatted number.
* @draft ICU 63
* @see NumberRangeFormatter
* @see #getFirstDecimal
*/
UnicodeString getSecondDecimal(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.
* @draft ICU 63
* @see UNumberRangeIdentityFallback
*/
UNumberRangeIdentityResult getIdentityResult(UErrorCode& status) const;
/**
* 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.
* @draft ICU 63
*/
FormattedNumberRange(FormattedNumberRange&& src) U_NOEXCEPT;
/**
* Move assignment:
* Leaves the source FormattedNumberRange in an undefined state.
* @draft ICU 63
*/
FormattedNumberRange& operator=(FormattedNumberRange&& src) U_NOEXCEPT;
/**
* Destruct an instance of FormattedNumberRange, cleaning up any memory it might own.
* @draft 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.
* @internal
*/
explicit FormattedNumberRange(impl::UFormattedNumberRangeData *results)
: fData(results), fErrorCode(U_ZERO_ERROR) {}
explicit FormattedNumberRange(UErrorCode errorCode)
: fData(nullptr), fErrorCode(errorCode) {}
void getAllFieldPositionsImpl(FieldPositionIteratorHandler& fpih, UErrorCode& status) const;
// To give LocalizedNumberRangeFormatter format methods access to this class's constructor:
friend class LocalizedNumberRangeFormatter;
};
/**
* See the main description in numberrangeformatter.h for documentation and examples.
*
* @draft 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.
* @draft 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.
* @draft 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 // U_HIDE_DRAFT_API
#endif // __NUMBERRANGEFORMATTER_H__
#endif /* #if !UCONFIG_NO_FORMATTING */