514 lines
14 KiB
C++
514 lines
14 KiB
C++
/*
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*****************************************************************************
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* Copyright (C) 2014-2016, International Business Machines Corporation and
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* others.
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* All Rights Reserved.
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*****************************************************************************
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*
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* File RELDATEFMT.H
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*****************************************************************************
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*/
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#ifndef __RELDATEFMT_H
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#define __RELDATEFMT_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "unicode/udisplaycontext.h"
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#include "unicode/ureldatefmt.h"
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#include "unicode/locid.h"
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/**
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* \file
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* \brief C++ API: Formats relative dates such as "1 day ago" or "tomorrow"
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*/
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#if !UCONFIG_NO_FORMATTING && !UCONFIG_NO_BREAK_ITERATION
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/**
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* Represents the unit for formatting a relative date. e.g "in 5 days"
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* or "in 3 months"
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* @stable ICU 53
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*/
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typedef enum UDateRelativeUnit {
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/**
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* Seconds
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* @stable ICU 53
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*/
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UDAT_RELATIVE_SECONDS,
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/**
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* Minutes
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* @stable ICU 53
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*/
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UDAT_RELATIVE_MINUTES,
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/**
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* Hours
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* @stable ICU 53
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*/
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UDAT_RELATIVE_HOURS,
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/**
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* Days
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* @stable ICU 53
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*/
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UDAT_RELATIVE_DAYS,
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/**
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* Weeks
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* @stable ICU 53
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*/
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UDAT_RELATIVE_WEEKS,
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/**
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* Months
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* @stable ICU 53
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*/
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UDAT_RELATIVE_MONTHS,
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/**
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* Years
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* @stable ICU 53
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*/
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UDAT_RELATIVE_YEARS,
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/**
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* Count of items in this enum.
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* @stable ICU 53
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*/
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UDAT_RELATIVE_UNIT_COUNT
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} UDateRelativeUnit;
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/**
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* Represents an absolute unit.
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* @stable ICU 53
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*/
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typedef enum UDateAbsoluteUnit {
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// Days of week have to remain together and in order from Sunday to
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// Saturday.
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/**
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* Sunday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_SUNDAY,
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/**
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* Monday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_MONDAY,
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/**
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* Tuesday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_TUESDAY,
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/**
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* Wednesday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_WEDNESDAY,
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/**
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* Thursday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_THURSDAY,
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/**
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* Friday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_FRIDAY,
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/**
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* Saturday
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_SATURDAY,
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/**
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* Day
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_DAY,
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/**
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* Week
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_WEEK,
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/**
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* Month
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_MONTH,
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/**
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* Year
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_YEAR,
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/**
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* Now
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_NOW,
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/**
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* Count of items in this enum.
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* @stable ICU 53
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*/
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UDAT_ABSOLUTE_UNIT_COUNT
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} UDateAbsoluteUnit;
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/**
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* Represents a direction for an absolute unit e.g "Next Tuesday"
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* or "Last Tuesday"
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* @stable ICU 53
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*/
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typedef enum UDateDirection {
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/**
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* Two before. Not fully supported in every locale.
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* @stable ICU 53
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*/
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UDAT_DIRECTION_LAST_2,
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/**
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* Last
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* @stable ICU 53
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*/
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UDAT_DIRECTION_LAST,
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/**
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* This
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* @stable ICU 53
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*/
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UDAT_DIRECTION_THIS,
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/**
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* Next
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* @stable ICU 53
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*/
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UDAT_DIRECTION_NEXT,
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/**
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* Two after. Not fully supported in every locale.
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* @stable ICU 53
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*/
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UDAT_DIRECTION_NEXT_2,
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/**
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* Plain, which means the absence of a qualifier.
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* @stable ICU 53
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*/
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UDAT_DIRECTION_PLAIN,
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/**
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* Count of items in this enum.
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* @stable ICU 53
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*/
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UDAT_DIRECTION_COUNT
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} UDateDirection;
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U_NAMESPACE_BEGIN
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class RelativeDateTimeCacheData;
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class SharedNumberFormat;
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class SharedPluralRules;
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class SharedBreakIterator;
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class NumberFormat;
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class UnicodeString;
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/**
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* Formats simple relative dates. There are two types of relative dates that
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* it handles:
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* <ul>
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* <li>relative dates with a quantity e.g "in 5 days"</li>
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* <li>relative dates without a quantity e.g "next Tuesday"</li>
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* </ul>
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* <p>
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* This API is very basic and is intended to be a building block for more
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* fancy APIs. The caller tells it exactly what to display in a locale
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* independent way. While this class automatically provides the correct plural
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* forms, the grammatical form is otherwise as neutral as possible. It is the
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* caller's responsibility to handle cut-off logic such as deciding between
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* displaying "in 7 days" or "in 1 week." This API supports relative dates
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* involving one single unit. This API does not support relative dates
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* involving compound units,
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* e.g "in 5 days and 4 hours" nor does it support parsing.
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* <p>
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* This class is mostly thread safe and immutable with the following caveats:
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* 1. The assignment operator violates Immutability. It must not be used
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* concurrently with other operations.
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* 2. Caller must not hold onto adopted pointers.
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* <p>
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* This class is not intended for public subclassing.
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* <p>
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* Here are some examples of use:
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* <blockquote>
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* <pre>
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* UErrorCode status = U_ZERO_ERROR;
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* UnicodeString appendTo;
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* RelativeDateTimeFormatter fmt(status);
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* // Appends "in 1 day"
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* fmt.format(
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* 1, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status);
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* // Appends "in 3 days"
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* fmt.format(
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* 3, UDAT_DIRECTION_NEXT, UDAT_RELATIVE_DAYS, appendTo, status);
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* // Appends "3.2 years ago"
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* fmt.format(
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* 3.2, UDAT_DIRECTION_LAST, UDAT_RELATIVE_YEARS, appendTo, status);
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* // Appends "last Sunday"
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* fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
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* // Appends "this Sunday"
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* fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
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* // Appends "next Sunday"
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* fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
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* // Appends "Sunday"
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* fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_SUNDAY, appendTo, status);
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*
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* // Appends "yesterday"
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* fmt.format(UDAT_DIRECTION_LAST, UDAT_ABSOLUTE_DAY, appendTo, status);
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* // Appends "today"
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* fmt.format(UDAT_DIRECTION_THIS, UDAT_ABSOLUTE_DAY, appendTo, status);
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* // Appends "tomorrow"
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* fmt.format(UDAT_DIRECTION_NEXT, UDAT_ABSOLUTE_DAY, appendTo, status);
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* // Appends "now"
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* fmt.format(UDAT_DIRECTION_PLAIN, UDAT_ABSOLUTE_NOW, appendTo, status);
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*
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* </pre>
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* </blockquote>
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* <p>
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* In the future, we may add more forms, such as abbreviated/short forms
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* (3 secs ago), and relative day periods ("yesterday afternoon"), etc.
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*
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* The RelativeDateTimeFormatter class is not intended for public subclassing.
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*
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* @stable ICU 53
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*/
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class U_I18N_API RelativeDateTimeFormatter : public UObject {
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public:
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/**
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* Create RelativeDateTimeFormatter with default locale.
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* @stable ICU 53
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*/
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RelativeDateTimeFormatter(UErrorCode& status);
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/**
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* Create RelativeDateTimeFormatter with given locale.
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* @stable ICU 53
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*/
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RelativeDateTimeFormatter(const Locale& locale, UErrorCode& status);
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/**
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* Create RelativeDateTimeFormatter with given locale and NumberFormat.
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*
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* @param locale the locale
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* @param nfToAdopt Constructed object takes ownership of this pointer.
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* It is an error for caller to delete this pointer or change its
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* contents after calling this constructor.
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* @status Any error is returned here.
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* @stable ICU 53
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*/
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RelativeDateTimeFormatter(
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const Locale& locale, NumberFormat *nfToAdopt, UErrorCode& status);
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/**
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* Create RelativeDateTimeFormatter with given locale, NumberFormat,
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* and capitalization context.
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*
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* @param locale the locale
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* @param nfToAdopt Constructed object takes ownership of this pointer.
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* It is an error for caller to delete this pointer or change its
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* contents after calling this constructor. Caller may pass NULL for
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* this argument if they want default number format behavior.
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* @param style the format style. The UDAT_RELATIVE bit field has no effect.
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* @param capitalizationContext A value from UDisplayContext that pertains to
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* capitalization.
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* @status Any error is returned here.
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* @stable ICU 54
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*/
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RelativeDateTimeFormatter(
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const Locale& locale,
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NumberFormat *nfToAdopt,
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UDateRelativeDateTimeFormatterStyle style,
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UDisplayContext capitalizationContext,
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UErrorCode& status);
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/**
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* Copy constructor.
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* @stable ICU 53
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*/
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RelativeDateTimeFormatter(const RelativeDateTimeFormatter& other);
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/**
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* Assignment operator.
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* @stable ICU 53
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*/
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RelativeDateTimeFormatter& operator=(
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const RelativeDateTimeFormatter& other);
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/**
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* Destructor.
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* @stable ICU 53
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*/
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virtual ~RelativeDateTimeFormatter();
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/**
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* Formats a relative date with a quantity such as "in 5 days" or
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* "3 months ago"
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* @param quantity The numerical amount e.g 5. This value is formatted
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* according to this object's NumberFormat object.
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* @param direction NEXT means a future relative date; LAST means a past
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* relative date. If direction is anything else, this method sets
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* status to U_ILLEGAL_ARGUMENT_ERROR.
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* @param unit the unit e.g day? month? year?
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* @param appendTo The string to which the formatted result will be
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* appended
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* @param status ICU error code returned here.
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* @return appendTo
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* @stable ICU 53
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*/
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UnicodeString& format(
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double quantity,
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UDateDirection direction,
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UDateRelativeUnit unit,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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/**
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* Formats a relative date without a quantity.
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* @param direction NEXT, LAST, THIS, etc.
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* @param unit e.g SATURDAY, DAY, MONTH
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* @param appendTo The string to which the formatted result will be
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* appended. If the value of direction is documented as not being fully
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* supported in all locales then this method leaves appendTo unchanged if
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* no format string is available.
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* @param status ICU error code returned here.
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* @return appendTo
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* @stable ICU 53
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*/
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UnicodeString& format(
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UDateDirection direction,
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UDateAbsoluteUnit unit,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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#ifndef U_HIDE_DRAFT_API
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/**
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* Format a combination of URelativeDateTimeUnit and numeric offset
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* using a numeric style, e.g. "1 week ago", "in 1 week",
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* "5 weeks ago", "in 5 weeks".
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*
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* @param offset The signed offset for the specified unit. This
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* will be formatted according to this object's
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* NumberFormat object.
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* @param unit The unit to use when formatting the relative
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* date, e.g. UDAT_REL_UNIT_WEEK,
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* UDAT_REL_UNIT_FRIDAY.
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* @param appendTo The string to which the formatted result will be
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* appended.
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* @param status ICU error code returned here.
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* @return appendTo
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* @draft ICU 57
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*/
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UnicodeString& formatNumeric(
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double offset,
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URelativeDateTimeUnit unit,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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/**
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* Format a combination of URelativeDateTimeUnit and numeric offset
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* using a text style if possible, e.g. "last week", "this week",
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* "next week", "yesterday", "tomorrow". Falls back to numeric
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* style if no appropriate text term is available for the specified
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* offset in the object's locale.
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*
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* @param offset The signed offset for the specified unit.
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* @param unit The unit to use when formatting the relative
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* date, e.g. UDAT_REL_UNIT_WEEK,
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* UDAT_REL_UNIT_FRIDAY.
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* @param appendTo The string to which the formatted result will be
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* appended.
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* @param status ICU error code returned here.
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* @return appendTo
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* @draft ICU 57
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*/
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UnicodeString& format(
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double offset,
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URelativeDateTimeUnit unit,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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#endif /* U_HIDE_DRAFT_API */
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/**
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* Combines a relative date string and a time string in this object's
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* locale. This is done with the same date-time separator used for the
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* default calendar in this locale.
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*
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* @param relativeDateString the relative date, e.g 'yesterday'
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* @param timeString the time e.g '3:45'
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* @param appendTo concatenated date and time appended here
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* @param status ICU error code returned here.
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* @return appendTo
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* @stable ICU 53
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*/
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UnicodeString& combineDateAndTime(
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const UnicodeString& relativeDateString,
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const UnicodeString& timeString,
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UnicodeString& appendTo,
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UErrorCode& status) const;
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/**
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* Returns the NumberFormat this object is using.
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*
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* @stable ICU 53
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*/
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const NumberFormat& getNumberFormat() const;
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/**
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* Returns the capitalization context.
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*
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* @stable ICU 54
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*/
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UDisplayContext getCapitalizationContext() const;
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/**
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* Returns the format style.
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*
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* @stable ICU 54
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*/
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UDateRelativeDateTimeFormatterStyle getFormatStyle() const;
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private:
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const RelativeDateTimeCacheData* fCache;
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const SharedNumberFormat *fNumberFormat;
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const SharedPluralRules *fPluralRules;
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UDateRelativeDateTimeFormatterStyle fStyle;
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UDisplayContext fContext;
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const SharedBreakIterator *fOptBreakIterator;
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Locale fLocale;
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void init(
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NumberFormat *nfToAdopt,
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BreakIterator *brkIter,
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UErrorCode &status);
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void adjustForContext(UnicodeString &) const;
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};
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U_NAMESPACE_END
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#endif /* !UCONFIG_NO_FORMATTING && !UCONFIG_NO_BREAK_ITERATION*/
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#endif
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