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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*****************************************************************************
* Copyright (C) 2014-2016, International Business Machines Corporation and
* others.
* All Rights Reserved.
*****************************************************************************
*
* File RELDATEFMT.H
*****************************************************************************
*/
#ifndef __RELDATEFMT_H
#define __RELDATEFMT_H
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
#include "unicode/uobject.h"
#include "unicode/udisplaycontext.h"
#include "unicode/ureldatefmt.h"
#include "unicode/locid.h"
#include "unicode/formattedvalue.h"
/**
* \file
* \brief C++ API: Formats relative dates such as "1 day ago" or "tomorrow"
*/
#if !UCONFIG_NO_FORMATTING
/**
* Represents the unit for formatting a relative date. e.g "in 5 days"
* or "in 3 months"
* @stable ICU 53
*/
typedef enum UDateRelativeUnit {
/**
* Seconds
* @stable ICU 53
*/
UDAT_RELATIVE_SECONDS,
/**
* Minutes
* @stable ICU 53
*/
UDAT_RELATIVE_MINUTES,
/**
* Hours
* @stable ICU 53
*/
UDAT_RELATIVE_HOURS,
/**
* Days
* @stable ICU 53
*/
UDAT_RELATIVE_DAYS,
/**
* Weeks
* @stable ICU 53
*/
UDAT_RELATIVE_WEEKS,
/**
* Months
* @stable ICU 53
*/
UDAT_RELATIVE_MONTHS,
/**
* Years
* @stable ICU 53
*/
UDAT_RELATIVE_YEARS,
#ifndef U_HIDE_DEPRECATED_API
/**
* One more than the highest normal UDateRelativeUnit value.
* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
*/
UDAT_RELATIVE_UNIT_COUNT
#endif // U_HIDE_DEPRECATED_API
} UDateRelativeUnit;
/**
* Represents an absolute unit.
* @stable ICU 53
*/
typedef enum UDateAbsoluteUnit {
// Days of week have to remain together and in order from Sunday to
// Saturday.
/**
* Sunday
* @stable ICU 53
*/
UDAT_ABSOLUTE_SUNDAY,
/**
* Monday
* @stable ICU 53
*/
UDAT_ABSOLUTE_MONDAY,
/**
* Tuesday
* @stable ICU 53
*/
UDAT_ABSOLUTE_TUESDAY,
/**
* Wednesday
* @stable ICU 53
*/
UDAT_ABSOLUTE_WEDNESDAY,
/**
* Thursday
* @stable ICU 53
*/
UDAT_ABSOLUTE_THURSDAY,
/**
* Friday
* @stable ICU 53
*/
UDAT_ABSOLUTE_FRIDAY,
/**
* Saturday
* @stable ICU 53
*/
UDAT_ABSOLUTE_SATURDAY,
/**
* Day
* @stable ICU 53
*/
UDAT_ABSOLUTE_DAY,
/**
* Week
* @stable ICU 53
*/
UDAT_ABSOLUTE_WEEK,
/**
* Month
* @stable ICU 53
*/
UDAT_ABSOLUTE_MONTH,
/**
* Year
* @stable ICU 53
*/
UDAT_ABSOLUTE_YEAR,
/**
* Now
* @stable ICU 53
*/
UDAT_ABSOLUTE_NOW,
/**
* Quarter
* @stable ICU 63
*/
UDAT_ABSOLUTE_QUARTER,
/**
* Hour
* @stable ICU 65
*/
UDAT_ABSOLUTE_HOUR,
/**
* Minute
* @stable ICU 65
*/
UDAT_ABSOLUTE_MINUTE,
#ifndef U_HIDE_DEPRECATED_API
/**
* One more than the highest normal UDateAbsoluteUnit value.
* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
*/
UDAT_ABSOLUTE_UNIT_COUNT = UDAT_ABSOLUTE_NOW + 4
#endif // U_HIDE_DEPRECATED_API
} UDateAbsoluteUnit;
/**
* Represents a direction for an absolute unit e.g "Next Tuesday"
* or "Last Tuesday"
* @stable ICU 53
*/
typedef enum UDateDirection {
/**
* Two before. Not fully supported in every locale.
* @stable ICU 53
*/
UDAT_DIRECTION_LAST_2,
/**
* Last
* @stable ICU 53
*/
UDAT_DIRECTION_LAST,
/**
* This
* @stable ICU 53
*/
UDAT_DIRECTION_THIS,
/**
* Next
* @stable ICU 53
*/
UDAT_DIRECTION_NEXT,
/**
* Two after. Not fully supported in every locale.
* @stable ICU 53
*/
UDAT_DIRECTION_NEXT_2,
/**
* Plain, which means the absence of a qualifier.
* @stable ICU 53
*/
UDAT_DIRECTION_PLAIN,
#ifndef U_HIDE_DEPRECATED_API
/**
* One more than the highest normal UDateDirection value.
* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
*/
UDAT_DIRECTION_COUNT
#endif // U_HIDE_DEPRECATED_API
} UDateDirection;
U_NAMESPACE_BEGIN
class BreakIterator;
class RelativeDateTimeCacheData;
class SharedNumberFormat;
class SharedPluralRules;
class SharedBreakIterator;
class NumberFormat;
class UnicodeString;
class FormattedRelativeDateTime;
class FormattedRelativeDateTimeData;
/**
* An immutable class containing the result of a relative datetime formatting operation.
*
* Instances of this class are immutable and thread-safe.
*
* Not intended for public subclassing.
*
* @stable ICU 64
*/
class U_I18N_API FormattedRelativeDateTime : public UMemory, public FormattedValue {
public:
/**
* Default constructor; makes an empty FormattedRelativeDateTime.
* @stable ICU 64
*/
FormattedRelativeDateTime() : fData(nullptr), fErrorCode(U_INVALID_STATE_ERROR) {}
/**
* Move constructor: Leaves the source FormattedRelativeDateTime in an undefined state.
* @stable ICU 64
*/
FormattedRelativeDateTime(FormattedRelativeDateTime&& src) noexcept;
/**
* Destruct an instance of FormattedRelativeDateTime.
* @stable ICU 64
*/
virtual ~FormattedRelativeDateTime() override;
/** Copying not supported; use move constructor instead. */
FormattedRelativeDateTime(const FormattedRelativeDateTime&) = delete;
/** Copying not supported; use move assignment instead. */
FormattedRelativeDateTime& operator=(const FormattedRelativeDateTime&) = delete;
/**
* Move assignment: Leaves the source FormattedRelativeDateTime in an undefined state.
* @stable ICU 64
*/
FormattedRelativeDateTime& operator=(FormattedRelativeDateTime&& src) noexcept;
/** @copydoc FormattedValue::toString() */
UnicodeString toString(UErrorCode& status) const override;
/** @copydoc FormattedValue::toTempString() */
UnicodeString toTempString(UErrorCode& status) const override;
/** @copydoc FormattedValue::appendTo() */
Appendable &appendTo(Appendable& appendable, UErrorCode& status) const override;
/** @copydoc FormattedValue::nextPosition() */
UBool nextPosition(ConstrainedFieldPosition& cfpos, UErrorCode& status) const override;
private:
FormattedRelativeDateTimeData *fData;
UErrorCode fErrorCode;
explicit FormattedRelativeDateTime(FormattedRelativeDateTimeData *results)
: fData(results), fErrorCode(U_ZERO_ERROR) {}
explicit FormattedRelativeDateTime(UErrorCode errorCode)
: fData(nullptr), fErrorCode(errorCode) {}
friend class RelativeDateTimeFormatter;
};
/**
* Formats simple relative dates. There are two types of relative dates that
* it handles:
*
*
*
* This API is very basic and is intended to be a building block for more * fancy APIs. The caller tells it exactly what to display in a locale * independent way. While this class automatically provides the correct plural * forms, the grammatical form is otherwise as neutral as possible. It is the * caller's responsibility to handle cut-off logic such as deciding between * displaying "in 7 days" or "in 1 week." This API supports relative dates * involving one single unit. This API does not support relative dates * involving compound units, * e.g "in 5 days and 4 hours" nor does it support parsing. *
* This class is mostly thread safe and immutable with the following caveats: * 1. The assignment operator violates Immutability. It must not be used * concurrently with other operations. * 2. Caller must not hold onto adopted pointers. *
* This class is not intended for public subclassing. *
* Here are some examples of use: *
*** UErrorCode status = U_ZERO_ERROR; * UnicodeString appendTo; * RelativeDateTimeFormatter fmt(status); * // Appends "in 1 day" * fmt.format( * 1, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status); * // Appends "in 3 days" * fmt.format( * 3, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status); * // Appends "3.2 years ago" * fmt.format( * 3.2, UDAT_DIRECTION_LAST, UDAT_RELATIVE_YEARS, appendTo, status); * // Appends "last Sunday" * fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_SUNDAY, appendTo, status); * // Appends "this Sunday" * fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_SUNDAY, appendTo, status); * // Appends "next Sunday" * fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_SUNDAY, appendTo, status); * // Appends "Sunday" * fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_SUNDAY, appendTo, status); * * // Appends "yesterday" * fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_DAY, appendTo, status); * // Appends "today" * fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_DAY, appendTo, status); * // Appends "tomorrow" * fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_DAY, appendTo, status); * // Appends "now" * fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_NOW, appendTo, status); * **
* The UDateRelativeDateTimeFormatterStyle parameter allows selection of
* different length styles: LONG ("3 seconds ago"), SHORT ("3 sec. ago"),
* NARROW ("3s ago"). In the future, we may add more forms, such as
* relative day periods ("yesterday afternoon"), etc.
*
* The RelativeDateTimeFormatter class is not intended for public subclassing.
*
* @stable ICU 53
*/
class U_I18N_API_CLASS RelativeDateTimeFormatter : public UObject {
public:
/**
* Create RelativeDateTimeFormatter with default locale.
* @stable ICU 53
*/
U_I18N_API RelativeDateTimeFormatter(UErrorCode& status);
/**
* Create RelativeDateTimeFormatter with given locale.
* @stable ICU 53
*/
U_I18N_API RelativeDateTimeFormatter(const Locale& locale, UErrorCode& status);
/**
* Create RelativeDateTimeFormatter with given locale and NumberFormat.
*
* @param locale the locale
* @param nfToAdopt Constructed object takes ownership of this pointer.
* It is an error for caller to delete this pointer or change its
* contents after calling this constructor.
* @param status Any error is returned here.
* @stable ICU 53
*/
U_I18N_API RelativeDateTimeFormatter(
const Locale& locale, NumberFormat *nfToAdopt, UErrorCode& status);
/**
* Create RelativeDateTimeFormatter with given locale, NumberFormat,
* and capitalization context.
*
* @param locale the locale
* @param nfToAdopt Constructed object takes ownership of this pointer.
* It is an error for caller to delete this pointer or change its
* contents after calling this constructor. Caller may pass nullptr for
* this argument if they want default number format behavior.
* @param style the format style. The UDAT_RELATIVE bit field has no effect.
* @param capitalizationContext A value from UDisplayContext that pertains to
* capitalization.
* @param status Any error is returned here.
* @stable ICU 54
*/
U_I18N_API RelativeDateTimeFormatter(
const Locale& locale,
NumberFormat *nfToAdopt,
UDateRelativeDateTimeFormatterStyle style,
UDisplayContext capitalizationContext,
UErrorCode& status);
/**
* Copy constructor.
* @stable ICU 53
*/
U_I18N_API RelativeDateTimeFormatter(const RelativeDateTimeFormatter& other);
/**
* Assignment operator.
* @stable ICU 53
*/
U_I18N_API RelativeDateTimeFormatter& operator=(
const RelativeDateTimeFormatter& other);
/**
* Destructor.
* @stable ICU 53
*/
U_I18N_API virtual ~RelativeDateTimeFormatter();
/**
* Formats a relative date with a quantity such as "in 5 days" or
* "3 months ago"
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param quantity The numerical amount e.g 5. This value is formatted
* according to this object's NumberFormat object.
* @param direction NEXT means a future relative date; LAST means a past
* relative date. If direction is anything else, this method sets
* status to U_ILLEGAL_ARGUMENT_ERROR.
* @param unit the unit e.g day? month? year?
* @param appendTo The string to which the formatted result will be
* appended
* @param status ICU error code returned here.
* @return appendTo
* @stable ICU 53
*/
U_I18N_API UnicodeString& format(
double quantity,
UDateDirection direction,
UDateRelativeUnit unit,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Formats a relative date with a quantity such as "in 5 days" or
* "3 months ago"
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* @param quantity The numerical amount e.g 5. This value is formatted
* according to this object's NumberFormat object.
* @param direction NEXT means a future relative date; LAST means a past
* relative date. If direction is anything else, this method sets
* status to U_ILLEGAL_ARGUMENT_ERROR.
* @param unit the unit e.g day? month? year?
* @param status ICU error code returned here.
* @return The formatted relative datetime
* @stable ICU 64
*/
U_I18N_API FormattedRelativeDateTime formatToValue(
double quantity,
UDateDirection direction,
UDateRelativeUnit unit,
UErrorCode& status) const;
/**
* Formats a relative date without a quantity.
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param direction NEXT, LAST, THIS, etc.
* @param unit e.g SATURDAY, DAY, MONTH
* @param appendTo The string to which the formatted result will be
* appended. If the value of direction is documented as not being fully
* supported in all locales then this method leaves appendTo unchanged if
* no format string is available.
* @param status ICU error code returned here.
* @return appendTo
* @stable ICU 53
*/
U_I18N_API UnicodeString& format(
UDateDirection direction,
UDateAbsoluteUnit unit,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Formats a relative date without a quantity.
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* If the string is not available in the requested locale, the return
* value will be empty (calling toString will give an empty string).
*
* @param direction NEXT, LAST, THIS, etc.
* @param unit e.g SATURDAY, DAY, MONTH
* @param status ICU error code returned here.
* @return The formatted relative datetime
* @stable ICU 64
*/
U_I18N_API FormattedRelativeDateTime formatToValue(
UDateDirection direction,
UDateAbsoluteUnit unit,
UErrorCode& status) const;
/**
* Format a combination of URelativeDateTimeUnit and numeric offset
* using a numeric style, e.g. "1 week ago", "in 1 week",
* "5 weeks ago", "in 5 weeks".
*
* This method returns a String. To get more information about the
* formatting result, use formatNumericToValue().
*
* @param offset The signed offset for the specified unit. This
* will be formatted according to this object's
* NumberFormat object.
* @param unit The unit to use when formatting the relative
* date, e.g. UDAT_REL_UNIT_WEEK,
* UDAT_REL_UNIT_FRIDAY.
* @param appendTo The string to which the formatted result will be
* appended.
* @param status ICU error code returned here.
* @return appendTo
* @stable ICU 57
*/
U_I18N_API UnicodeString& formatNumeric(
double offset,
URelativeDateTimeUnit unit,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Format a combination of URelativeDateTimeUnit and numeric offset
* using a numeric style, e.g. "1 week ago", "in 1 week",
* "5 weeks ago", "in 5 weeks".
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by formatNumeric().
*
* @param offset The signed offset for the specified unit. This
* will be formatted according to this object's
* NumberFormat object.
* @param unit The unit to use when formatting the relative
* date, e.g. UDAT_REL_UNIT_WEEK,
* UDAT_REL_UNIT_FRIDAY.
* @param status ICU error code returned here.
* @return The formatted relative datetime
* @stable ICU 64
*/
U_I18N_API FormattedRelativeDateTime formatNumericToValue(
double offset,
URelativeDateTimeUnit unit,
UErrorCode& status) const;
/**
* Format a combination of URelativeDateTimeUnit and numeric offset
* using a text style if possible, e.g. "last week", "this week",
* "next week", "yesterday", "tomorrow". Falls back to numeric
* style if no appropriate text term is available for the specified
* offset in the object's locale.
*
* This method returns a String. To get more information about the
* formatting result, use formatToValue().
*
* @param offset The signed offset for the specified unit.
* @param unit The unit to use when formatting the relative
* date, e.g. UDAT_REL_UNIT_WEEK,
* UDAT_REL_UNIT_FRIDAY.
* @param appendTo The string to which the formatted result will be
* appended.
* @param status ICU error code returned here.
* @return appendTo
* @stable ICU 57
*/
U_I18N_API UnicodeString& format(
double offset,
URelativeDateTimeUnit unit,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Format a combination of URelativeDateTimeUnit and numeric offset
* using a text style if possible, e.g. "last week", "this week",
* "next week", "yesterday", "tomorrow". Falls back to numeric
* style if no appropriate text term is available for the specified
* offset in the object's locale.
*
* This method returns a FormattedRelativeDateTime, which exposes more
* information than the String returned by format().
*
* @param offset The signed offset for the specified unit.
* @param unit The unit to use when formatting the relative
* date, e.g. UDAT_REL_UNIT_WEEK,
* UDAT_REL_UNIT_FRIDAY.
* @param status ICU error code returned here.
* @return The formatted relative datetime
* @stable ICU 64
*/
U_I18N_API FormattedRelativeDateTime formatToValue(
double offset,
URelativeDateTimeUnit unit,
UErrorCode& status) const;
/**
* Combines a relative date string and a time string in this object's
* locale. This is done with the same date-time separator used for the
* default calendar in this locale.
*
* @param relativeDateString the relative date, e.g 'yesterday'
* @param timeString the time e.g '3:45'
* @param appendTo concatenated date and time appended here
* @param status ICU error code returned here.
* @return appendTo
* @stable ICU 53
*/
U_I18N_API UnicodeString& combineDateAndTime(
const UnicodeString& relativeDateString,
const UnicodeString& timeString,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Returns the NumberFormat this object is using.
*
* @stable ICU 53
*/
U_I18N_API const NumberFormat& getNumberFormat() const;
/**
* Returns the capitalization context.
*
* @stable ICU 54
*/
U_I18N_API UDisplayContext getCapitalizationContext() const;
/**
* Returns the format style.
*
* @stable ICU 54
*/
U_I18N_API UDateRelativeDateTimeFormatterStyle getFormatStyle() const;
private:
const RelativeDateTimeCacheData* fCache;
const SharedNumberFormat *fNumberFormat;
const SharedPluralRules *fPluralRules;
UDateRelativeDateTimeFormatterStyle fStyle;
UDisplayContext fContext;
#if !UCONFIG_NO_BREAK_ITERATION
const SharedBreakIterator *fOptBreakIterator;
#else
std::nullptr_t fOptBreakIterator = nullptr;
#endif // !UCONFIG_NO_BREAK_ITERATION
Locale fLocale;
void init(
NumberFormat *nfToAdopt,
#if !UCONFIG_NO_BREAK_ITERATION
BreakIterator *brkIter,
#else
std::nullptr_t,
#endif // !UCONFIG_NO_BREAK_ITERATION
UErrorCode &status);
UnicodeString& adjustForContext(UnicodeString &) const;
UBool checkNoAdjustForContext(UErrorCode& status) const;
template