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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
* Copyright (C) 1997-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*
* File SMPDTFMT.H
*
* Modification History:
*
* Date Name Description
* 02/19/97 aliu Converted from java.
* 07/09/97 helena Make ParsePosition into a class.
* 07/21/98 stephen Added GMT_PLUS, GMT_MINUS
* Changed setTwoDigitStartDate to set2DigitYearStart
* Changed getTwoDigitStartDate to get2DigitYearStart
* Removed subParseLong
* Removed getZoneIndex (added in DateFormatSymbols)
* 06/14/99 stephen Removed fgTimeZoneDataSuffix
* 10/14/99 aliu Updated class doc to describe 2-digit year parsing
* {j28 4182066}.
*******************************************************************************
*/
#ifndef SMPDTFMT_H
#define SMPDTFMT_H
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
/**
* \file
* \brief C++ API: Format and parse dates in a language-independent manner.
*/
#if !UCONFIG_NO_FORMATTING
#include "unicode/datefmt.h"
#include "unicode/udisplaycontext.h"
#include "unicode/tzfmt.h" /* for UTimeZoneFormatTimeType */
#include "unicode/brkiter.h"
U_NAMESPACE_BEGIN
class DateFormatSymbols;
class DateFormat;
class MessageFormat;
class FieldPositionHandler;
class TimeZoneFormat;
class SharedNumberFormat;
class SimpleDateFormatMutableNFs;
class DateIntervalFormat;
namespace number {
class LocalizedNumberFormatter;
class SimpleNumberFormatter;
}
/**
*
* SimpleDateFormat is a concrete class for formatting and parsing dates in a
* language-independent manner. It allows for formatting (millis -> text),
* parsing (text -> millis), and normalization. Formats/Parses a date or time,
* which is the standard milliseconds since 24:00 GMT, Jan 1, 1970.
* <P>
* Clients are encouraged to create a date-time formatter using DateFormat::getInstance(),
* getDateInstance(), getDateInstance(), or getDateTimeInstance() rather than
* explicitly constructing an instance of SimpleDateFormat. This way, the client
* is guaranteed to get an appropriate formatting pattern for whatever locale the
* program is running in. If the client needs more control, they should consider using
* DateFormat::createInstanceForSkeleton(). However, if the client needs something more unusual than
* the default patterns in the locales, he can construct a SimpleDateFormat directly
* and give it an appropriate pattern (or use one of the factory methods on DateFormat
* and modify the pattern after the fact with toPattern() and applyPattern().
*
* <p><strong>Date and Time Patterns:</strong></p>
*
* <p>Date and time formats are specified by <em>date and time pattern</em> strings.
* The full syntax for date and time patterns can be found at
* <a href="https://unicode.org/reports/tr35/tr35-dates.html#Date_Format_Patterns">https://unicode.org/reports/tr35/tr35-dates.html#Date_Format_Patterns</a>.
*
* Within date and time pattern strings, all unquoted ASCII letters [A-Za-z] are reserved
* as pattern letters representing calendar fields. Some of the most commonly used pattern letters are:</p>
*
* <table border="1">
* <tr>
* <th style="text-align: center">Sym.</th>
* <th style="text-align: center">No.</th>
* <th>Example</th>
* <th>Description</th>
* </tr>
* <tr>
* <td style="text-align: center">G</td>
* <td style="text-align: center">1..3</td>
* <td>AD</td>
* <td>Era - Replaced with the Era string for the current date. One to three letters for the
* abbreviated form, four letters for the long (wide) form, five for the narrow form.</td>
* </tr>
* <tr>
* <td style="text-align: center">y</td>
* <td style="text-align: center">1..n</td>
* <td>1996</td>
* <td>Year. Normally the length specifies the padding, but for two letters it also specifies the maximum
* length. Example:<div style="text-align: center">
* <center>
* <table border="1" cellpadding="2" cellspacing="0">
* <tr>
* <th>Year</th>
* <th style="text-align: right">y</th>
* <th style="text-align: right">yy</th>
* <th style="text-align: right">yyy</th>
* <th style="text-align: right">yyyy</th>
* <th style="text-align: right">yyyyy</th>
* </tr>
* <tr>
* <td>AD 1</td>
* <td style="text-align: right">1</td>
* <td style="text-align: right">01</td>
* <td style="text-align: right">001</td>
* <td style="text-align: right">0001</td>
* <td style="text-align: right">00001</td>
* </tr>
* <tr>
* <td>AD 12</td>
* <td style="text-align: right">12</td>
* <td style="text-align: right">12</td>
* <td style="text-align: right">012</td>
* <td style="text-align: right">0012</td>
* <td style="text-align: right">00012</td>
* </tr>
* <tr>
* <td>AD 123</td>
* <td style="text-align: right">123</td>
* <td style="text-align: right">23</td>
* <td style="text-align: right">123</td>
* <td style="text-align: right">0123</td>
* <td style="text-align: right">00123</td>
* </tr>
* <tr>
* <td>AD 1234</td>
* <td style="text-align: right">1234</td>
* <td style="text-align: right">34</td>
* <td style="text-align: right">1234</td>
* <td style="text-align: right">1234</td>
* <td style="text-align: right">01234</td>
* </tr>
* <tr>
* <td>AD 12345</td>
* <td style="text-align: right">12345</td>
* <td style="text-align: right">45</td>
* <td style="text-align: right">12345</td>
* <td style="text-align: right">12345</td>
* <td style="text-align: right">12345</td>
* </tr>
* </table>
* </center></div>
* </td>
* </tr>
* <tr>
* <td rowspan="3" style="text-align: center">Q</td>
* <td style="text-align: center">1..2</td>
* <td>02</td>
* <td rowspan="3">Quarter - Use one or two for the numerical quarter, three for the abbreviation, or four
* for the full (wide) name (five for the narrow name is not yet supported).</td>
* </tr>
* <tr>
* <td style="text-align: center">3</td>
* <td>Q2</td>
* </tr>
* <tr>
* <td style="text-align: center">4</td>
* <td>2nd quarter</td>
* </tr>
* <tr>
* <td rowspan="4" style="text-align: center">M</td>
* <td style="text-align: center">1..2</td>
* <td>09</td>
* <td rowspan="4">Month - Use one or two for the numerical month, three for the abbreviation, four for
* the full (wide) name, or five for the narrow name. With two ("MM"), the month number is zero-padded
* if necessary (e.g. "08").</td>
* </tr>
* <tr>
* <td style="text-align: center">3</td>
* <td>Sep</td>
* </tr>
* <tr>
* <td style="text-align: center">4</td>
* <td>September</td>
* </tr>
* <tr>
* <td style="text-align: center">5</td>
* <td>S</td>
* </tr>
* <tr>
* <td style="text-align: center">d</td>
* <td style="text-align: center">1..2</td>
* <td>1</td>
* <td>Date - Day of the month. Use "d" to show the minimum number of digits, or "dd" to always show
* two digits (zero-padding if necessary, e.g. "08").</td>
* </tr>
* <tr>
* <td rowspan="4" style="text-align: center">E</td>
* <td style="text-align: center">1..3</td>
* <td>Tue</td>
* <td rowspan="4">Day of week - Use one through three letters for the short day, four for the full (wide) name,
* five for the narrow name, or six for the short name.</td>
* </tr>
* <tr>
* <td style="text-align: center">4</td>
* <td>Tuesday</td>
* </tr>
* <tr>
* <td style="text-align: center">5</td>
* <td>T</td>
* </tr>
* <tr>
* <td style="text-align: center">6</td>
* <td>Tu</td>
* </tr>
* <tr>
* <td style="text-align: center">a</td>
* <td style="text-align: center">1</td>
* <td>AM</td>
* <td>AM or PM</td>
* </tr>
* <tr>
* <td style="text-align: center">h</td>
* <td style="text-align: center">1..2</td>
* <td>11</td>
* <td>Hour [1-12]. When used in skeleton data or in a skeleton passed in an API for flexible data pattern
* generation, it should match the 12-hour-cycle format preferred by the locale (h or K); it should not match
* a 24-hour-cycle format (H or k). Use hh for zero padding.</td>
* </tr>
* <tr>
* <td style="text-align: center">H</td>
* <td style="text-align: center">1..2</td>
* <td>13</td>
* <td>Hour [0-23]. When used in skeleton data or in a skeleton passed in an API for flexible data pattern
* generation, it should match the 24-hour-cycle format preferred by the locale (H or k); it should not match a
* 12-hour-cycle format (h or K). Use HH for zero padding.</td>
* </tr>
* <tr>
* <td style="text-align: center">m</td>
* <td style="text-align: center">1..2</td>
* <td>59</td>
* <td>Minute. Use "m" to show the minimum number of digits, or "mm" to always show two digits
* (zero-padding if necessary, e.g. "08")..</td>
* </tr>
* <tr>
* <td style="text-align: center">s</td>
* <td style="text-align: center">1..2</td>
* <td>12</td>
* <td>Second. Use "s" to show the minimum number of digits, or "ss" to always show two digits
* (zero-padding if necessary, e.g. "08").</td>
* </tr>
* <tr>
* <td rowspan="2" style="text-align: center">z</td>
* <td style="text-align: center">1..3</td>
* <td>PDT</td>
* <td>Time zone. The <i>short specific non-location format</i>.
* Where that is unavailable, falls back to the <i>short localized GMT format</i> ("O").</td>
* </tr>
* <tr>
* <td style="text-align: center">4</td>
* <td>Pacific Daylight Time</td>
* <td>The <i>long specific non-location format</i>.
* Where that is unavailable, falls back to the <i>long localized GMT format</i> ("OOOO").</td>
* </tr>
* <tr>
* <td rowspan="2" style="text-align: center">v</td>
* <td style="text-align: center">1</td>
* <td>PT</td>
* <td>Time zone. The <i>short generic non-location format</i>.
* Where that is unavailable, falls back to the <i>generic location format</i> ("VVVV"),
* then the <i>short localized GMT format</i> as the final fallback.</td>
* </tr>
* <tr>
* <td style="text-align: center">4</td>
* <td>Pacific Time</td>
* <td>The <i>long generic non-location format</i>.
* Where that is unavailable, falls back to <i>generic location format</i> ("VVVV").
* </tr>
* </table>
*
* <P>
* Any characters in the pattern that are not in the ranges of ['a'..'z'] and
* ['A'..'Z'] will be treated as quoted text. For instance, characters
* like ':', '.', ' ', '#' and '@' will appear in the resulting time text
* even they are not embraced within single quotes.
* <P>
* A pattern containing any invalid pattern letter will result in a failing
* UErrorCode result during formatting or parsing.
* <P>
* Examples using the US locale:
* <pre>
* \code
* Format Pattern Result
* -------------- -------
* "yyyy.MM.dd G 'at' HH:mm:ss vvvv" ->> 1996.07.10 AD at 15:08:56 Pacific Time
* "EEE, MMM d, ''yy" ->> Wed, July 10, '96
* "h:mm a" ->> 12:08 PM
* "hh 'o''clock' a, zzzz" ->> 12 o'clock PM, Pacific Daylight Time
* "K:mm a, vvv" ->> 0:00 PM, PT
* "yyyyy.MMMMM.dd GGG hh:mm aaa" ->> 1996.July.10 AD 12:08 PM
* \endcode
* </pre>
* Code Sample:
* <pre>
* \code
* UErrorCode success = U_ZERO_ERROR;
* SimpleTimeZone* pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, "PST");
* pdt->setStartRule( Calendar::APRIL, 1, Calendar::SUNDAY, 2*60*60*1000);
* pdt->setEndRule( Calendar::OCTOBER, -1, Calendar::SUNDAY, 2*60*60*1000);
*
* // Format the current time.
* SimpleDateFormat* formatter
* = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mm:ss a zzz", success );
* GregorianCalendar cal(success);
* UDate currentTime_1 = cal.getTime(success);
* FieldPosition fp(FieldPosition::DONT_CARE);
* UnicodeString dateString;
* formatter->format( currentTime_1, dateString, fp );
* cout << "result: " << dateString << endl;
*
* // Parse the previous string back into a Date.
* ParsePosition pp(0);
* UDate currentTime_2 = formatter->parse(dateString, pp );
* \endcode
* </pre>
* In the above example, the time value "currentTime_2" obtained from parsing
* will be equal to currentTime_1. However, they may not be equal if the am/pm
* marker 'a' is left out from the format pattern while the "hour in am/pm"
* pattern symbol is used. This information loss can happen when formatting the
* time in PM.
*
* <p>
* When parsing a date string using the abbreviated year pattern ("y" or "yy"),
* SimpleDateFormat must interpret the abbreviated year
* relative to some century. It does this by adjusting dates to be
* within 80 years before and 20 years after the time the SimpleDateFormat
* instance is created. For example, using a pattern of "MM/dd/yy" and a
* SimpleDateFormat instance created on Jan 1, 1997, the string
* "01/11/12" would be interpreted as Jan 11, 2012 while the string "05/04/64"
* would be interpreted as May 4, 1964.
* During parsing, only strings consisting of exactly two digits, as defined by
* <code>Unicode::isDigit()</code>, will be parsed into the default century.
* Any other numeric string, such as a one digit string, a three or more digit
* string, or a two digit string that isn't all digits (for example, "-1"), is
* interpreted literally. So "01/02/3" or "01/02/003" are parsed (for the
* Gregorian calendar), using the same pattern, as Jan 2, 3 AD. Likewise (but
* only in lenient parse mode, the default) "01/02/-3" is parsed as Jan 2, 4 BC.
*
* <p>
* If the year pattern has more than two 'y' characters, the year is
* interpreted literally, regardless of the number of digits. So using the
* pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.
*
* <p>
* When numeric fields abut one another directly, with no intervening delimiter
* characters, they constitute a run of abutting numeric fields. Such runs are
* parsed specially. For example, the format "HHmmss" parses the input text
* "123456" to 12:34:56, parses the input text "12345" to 1:23:45, and fails to
* parse "1234". In other words, the leftmost field of the run is flexible,
* while the others keep a fixed width. If the parse fails anywhere in the run,
* then the leftmost field is shortened by one character, and the entire run is
* parsed again. This is repeated until either the parse succeeds or the
* leftmost field is one character in length. If the parse still fails at that
* point, the parse of the run fails.
*
* <P>
* For time zones that have no names, SimpleDateFormat uses strings GMT+hours:minutes or
* GMT-hours:minutes.
* <P>
* The calendar defines what is the first day of the week, the first week of the
* year, whether hours are zero based or not (0 vs 12 or 24), and the timezone.
* There is one common number format to handle all the numbers; the digit count
* is handled programmatically according to the pattern.
*
* <p><em>User subclasses are not supported.</em> While clients may write
* subclasses, such code will not necessarily work and will not be
* guaranteed to work stably from release to release.
*/
class U_I18N_API SimpleDateFormat: public DateFormat {
public:
/**
* Construct a SimpleDateFormat using the default pattern for the default
* locale.
* <P>
* [Note:] Not all locales support SimpleDateFormat; for full generality,
* use the factory methods in the DateFormat class.
* @param status Output param set to success/failure code.
* @stable ICU 2.0
*/
SimpleDateFormat(UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern and the default locale.
* The locale is used to obtain the symbols used in formatting (e.g., the
* names of the months), but not to provide the pattern.
* <P>
* [Note:] Not all locales support SimpleDateFormat; for full generality,
* use the factory methods in the DateFormat class.
* @param pattern the pattern for the format.
* @param status Output param set to success/failure code.
* @stable ICU 2.0
*/
SimpleDateFormat(const UnicodeString& pattern,
UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern, numbering system override, and the default locale.
* The locale is used to obtain the symbols used in formatting (e.g., the
* names of the months), but not to provide the pattern.
* <P>
* A numbering system override is a string containing either the name of a known numbering system,
* or a set of field and numbering system pairs that specify which fields are to be formatted with
* the alternate numbering system. For example, to specify that all numeric fields in the specified
* date or time pattern are to be rendered using Thai digits, simply specify the numbering system override
* as "thai". To specify that just the year portion of the date be formatted using Hebrew numbering,
* use the override string "y=hebrew". Numbering system overrides can be combined using a semi-colon
* character in the override string, such as "d=decimal;M=arabic;y=hebrew", etc.
*
* <P>
* [Note:] Not all locales support SimpleDateFormat; for full generality,
* use the factory methods in the DateFormat class.
* @param pattern the pattern for the format.
* @param override the override string.
* @param status Output param set to success/failure code.
* @stable ICU 4.2
*/
SimpleDateFormat(const UnicodeString& pattern,
const UnicodeString& override,
UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern and locale.
* The locale is used to obtain the symbols used in formatting (e.g., the
* names of the months), but not to provide the pattern.
* <P>
* [Note:] Not all locales support SimpleDateFormat; for full generality,
* use the factory methods in the DateFormat class.
* @param pattern the pattern for the format.
* @param locale the given locale.
* @param status Output param set to success/failure code.
* @stable ICU 2.0
*/
SimpleDateFormat(const UnicodeString& pattern,
const Locale& locale,
UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern, numbering system override, and locale.
* The locale is used to obtain the symbols used in formatting (e.g., the
* names of the months), but not to provide the pattern.
* <P>
* A numbering system override is a string containing either the name of a known numbering system,
* or a set of field and numbering system pairs that specify which fields are to be formatted with
* the alternate numbering system. For example, to specify that all numeric fields in the specified
* date or time pattern are to be rendered using Thai digits, simply specify the numbering system override
* as "thai". To specify that just the year portion of the date be formatted using Hebrew numbering,
* use the override string "y=hebrew". Numbering system overrides can be combined using a semi-colon
* character in the override string, such as "d=decimal;M=arabic;y=hebrew", etc.
* <P>
* [Note:] Not all locales support SimpleDateFormat; for full generality,
* use the factory methods in the DateFormat class.
* @param pattern the pattern for the format.
* @param override the numbering system override.
* @param locale the given locale.
* @param status Output param set to success/failure code.
* @stable ICU 4.2
*/
SimpleDateFormat(const UnicodeString& pattern,
const UnicodeString& override,
const Locale& locale,
UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern and locale-specific
* symbol data. The formatter takes ownership of the DateFormatSymbols object;
* the caller is no longer responsible for deleting it.
* @param pattern the given pattern for the format.
* @param formatDataToAdopt the symbols to be adopted.
* @param status Output param set to success/faulure code.
* @stable ICU 2.0
*/
SimpleDateFormat(const UnicodeString& pattern,
DateFormatSymbols* formatDataToAdopt,
UErrorCode& status);
/**
* Construct a SimpleDateFormat using the given pattern and locale-specific
* symbol data. The DateFormatSymbols object is NOT adopted; the caller
* remains responsible for deleting it.
* @param pattern the given pattern for the format.
* @param formatData the formatting symbols to be use.
* @param status Output param set to success/faulure code.
* @stable ICU 2.0
*/
SimpleDateFormat(const UnicodeString& pattern,
const DateFormatSymbols& formatData,
UErrorCode& status);
/**
* Copy constructor.
* @stable ICU 2.0
*/
SimpleDateFormat(const SimpleDateFormat&);
/**
* Assignment operator.
* @stable ICU 2.0
*/
SimpleDateFormat& operator=(const SimpleDateFormat&);
/**
* Destructor.
* @stable ICU 2.0
*/
virtual ~SimpleDateFormat();
/**
* Clone this Format object polymorphically. The caller owns the result and
* should delete it when done.
* @return A copy of the object.
* @stable ICU 2.0
*/
virtual SimpleDateFormat* clone() const override;
/**
* Return true if the given Format objects are semantically equal. Objects
* of different subclasses are considered unequal.
* @param other the object to be compared with.
* @return true if the given Format objects are semantically equal.
* @stable ICU 2.0
*/
virtual bool operator==(const Format& other) const override;
using DateFormat::format;
/**
* Format a date or time, which is the standard millis since 24:00 GMT, Jan
* 1, 1970. Overrides DateFormat pure virtual method.
* <P>
* Example: using the US locale: "yyyy.MM.dd e 'at' HH:mm:ss zzz" ->>
* 1996.07.10 AD at 15:08:56 PDT
*
* @param cal Calendar set to the date and time to be formatted
* into a date/time string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param pos The formatting position. On input: an alignment field,
* if desired. On output: the offsets of the alignment field.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.1
*/
virtual UnicodeString& format( Calendar& cal,
UnicodeString& appendTo,
FieldPosition& pos) const override;
/**
* Format a date or time, which is the standard millis since 24:00 GMT, Jan
* 1, 1970. Overrides DateFormat pure virtual method.
* <P>
* Example: using the US locale: "yyyy.MM.dd e 'at' HH:mm:ss zzz" ->>
* 1996.07.10 AD at 15:08:56 PDT
*
* @param cal Calendar set to the date and time to be formatted
* into a date/time string.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param posIter On return, can be used to iterate over positions
* of fields generated by this format call. Field values
* are defined in UDateFormatField.
* @param status Input/output param set to success/failure code.
* @return Reference to 'appendTo' parameter.
* @stable ICU 4.4
*/
virtual UnicodeString& format( Calendar& cal,
UnicodeString& appendTo,
FieldPositionIterator* posIter,
UErrorCode& status) const override;
using DateFormat::parse;
/**
* Parse a date/time string beginning at the given parse position. For
* example, a time text "07/10/96 4:5 PM, PDT" will be parsed into a Date
* that is equivalent to Date(837039928046).
* <P>
* By default, parsing is lenient: If the input is not in the form used by
* this object's format method but can still be parsed as a date, then the
* parse succeeds. Clients may insist on strict adherence to the format by
* calling setLenient(false).
* @see DateFormat::setLenient(boolean)
*
* @param text The date/time string to be parsed
* @param cal A Calendar set on input to the date and time to be used for
* missing values in the date/time string being parsed, and set
* on output to the parsed date/time. When the calendar type is
* different from the internal calendar held by this SimpleDateFormat
* instance, the internal calendar will be cloned to a work
* calendar set to the same milliseconds and time zone as the
* cal parameter, field values will be parsed based on the work
* calendar, then the result (milliseconds and time zone) will
* be set in this calendar.
* @param pos On input, the position at which to start parsing; on
* output, the position at which parsing terminated, or the
* start position if the parse failed.
* @stable ICU 2.1
*/
virtual void parse( const UnicodeString& text,
Calendar& cal,
ParsePosition& pos) const override;
/**
* Set the start UDate used to interpret two-digit year strings.
* When dates are parsed having 2-digit year strings, they are placed within
* a assumed range of 100 years starting on the two digit start date. For
* example, the string "24-Jan-17" may be in the year 1817, 1917, 2017, or
* some other year. SimpleDateFormat chooses a year so that the resultant
* date is on or after the two digit start date and within 100 years of the
* two digit start date.
* <P>
* By default, the two digit start date is set to 80 years before the current
* time at which a SimpleDateFormat object is created.
* @param d start UDate used to interpret two-digit year strings.
* @param status Filled in with U_ZERO_ERROR if the parse was successful, and with
* an error value if there was a parse error.
* @stable ICU 2.0
*/
virtual void set2DigitYearStart(UDate d, UErrorCode& status);
/**
* Get the start UDate used to interpret two-digit year strings.
* When dates are parsed having 2-digit year strings, they are placed within
* a assumed range of 100 years starting on the two digit start date. For
* example, the string "24-Jan-17" may be in the year 1817, 1917, 2017, or
* some other year. SimpleDateFormat chooses a year so that the resultant
* date is on or after the two digit start date and within 100 years of the
* two digit start date.
* <P>
* By default, the two digit start date is set to 80 years before the current
* time at which a SimpleDateFormat object is created.
* @param status Filled in with U_ZERO_ERROR if the parse was successful, and with
* an error value if there was a parse error.
* @stable ICU 2.0
*/
UDate get2DigitYearStart(UErrorCode& status) const;
/**
* Return a pattern string describing this date format.
* @param result Output param to receive the pattern.
* @return A reference to 'result'.
* @stable ICU 2.0
*/
virtual UnicodeString& toPattern(UnicodeString& result) const;
/**
* Return a localized pattern string describing this date format.
* In most cases, this will return the same thing as toPattern(),
* but a locale can specify characters to use in pattern descriptions
* in place of the ones described in this class's class documentation.
* (Presumably, letters that would be more mnemonic in that locale's
* language.) This function would produce a pattern using those
* letters.
* <p>
* <b>Note:</b> This implementation depends on DateFormatSymbols::getLocalPatternChars()
* to get localized format pattern characters. ICU does not include
* localized pattern character data, therefore, unless user sets localized
* pattern characters manually, this method returns the same result as
* toPattern().
*
* @param result Receives the localized pattern.
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @return A reference to 'result'.
* @stable ICU 2.0
*/
virtual UnicodeString& toLocalizedPattern(UnicodeString& result,
UErrorCode& status) const;
/**
* Apply the given unlocalized pattern string to this date format.
* (i.e., after this call, this formatter will format dates according to
* the new pattern)
*
* @param pattern The pattern to be applied.
* @stable ICU 2.0
*/
virtual void applyPattern(const UnicodeString& pattern);
/**
* Apply the given localized pattern string to this date format.
* (see toLocalizedPattern() for more information on localized patterns.)
*
* @param pattern The localized pattern to be applied.
* @param status Output param set to success/failure code on
* exit. If the pattern is invalid, this will be
* set to a failure result.
* @stable ICU 2.0
*/
virtual void applyLocalizedPattern(const UnicodeString& pattern,
UErrorCode& status);
/**
* Gets the date/time formatting symbols (this is an object carrying
* the various strings and other symbols used in formatting: e.g., month
* names and abbreviations, time zone names, AM/PM strings, etc.)
* @return a copy of the date-time formatting data associated
* with this date-time formatter.
* @stable ICU 2.0
*/
virtual const DateFormatSymbols* getDateFormatSymbols() const;
/**
* Set the date/time formatting symbols. The caller no longer owns the
* DateFormatSymbols object and should not delete it after making this call.
* @param newFormatSymbols the given date-time formatting symbols to copy.
* @stable ICU 2.0
*/
virtual void adoptDateFormatSymbols(DateFormatSymbols* newFormatSymbols);
/**
* Set the date/time formatting data.
* @param newFormatSymbols the given date-time formatting symbols to copy.
* @stable ICU 2.0
*/
virtual void setDateFormatSymbols(const DateFormatSymbols& newFormatSymbols);
/**
* Return the class ID for this class. This is useful only for comparing to
* a return value from getDynamicClassID(). For example:
* <pre>
* . Base* polymorphic_pointer = createPolymorphicObject();
* . if (polymorphic_pointer->getDynamicClassID() ==
* . erived::getStaticClassID()) ...
* </pre>
* @return The class ID for all objects of this class.
* @stable ICU 2.0
*/
static UClassID U_EXPORT2 getStaticClassID();
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
* method is to implement a simple version of RTTI, since not all C++
* compilers support genuine RTTI. Polymorphic operator==() and clone()
* methods call this method.
*
* @return The class ID for this object. All objects of a
* given class have the same class ID. Objects of
* other classes have different class IDs.
* @stable ICU 2.0
*/
virtual UClassID getDynamicClassID() const override;
/**
* Set the calendar to be used by this date format. Initially, the default
* calendar for the specified or default locale is used. The caller should
* not delete the Calendar object after it is adopted by this call.
* Adopting a new calendar will change to the default symbols.
*
* @param calendarToAdopt Calendar object to be adopted.
* @stable ICU 2.0
*/
virtual void adoptCalendar(Calendar* calendarToAdopt) override;
/* Cannot use #ifndef U_HIDE_INTERNAL_API for the following methods since they are virtual */
/**
* Sets the TimeZoneFormat to be used by this date/time formatter.
* The caller should not delete the TimeZoneFormat object after
* it is adopted by this call.
* @param timeZoneFormatToAdopt The TimeZoneFormat object to be adopted.
* @internal ICU 49 technology preview
*/
virtual void adoptTimeZoneFormat(TimeZoneFormat* timeZoneFormatToAdopt);
/**
* Sets the TimeZoneFormat to be used by this date/time formatter.
* @param newTimeZoneFormat The TimeZoneFormat object to copy.
* @internal ICU 49 technology preview
*/
virtual void setTimeZoneFormat(const TimeZoneFormat& newTimeZoneFormat);
/**
* Gets the time zone format object associated with this date/time formatter.
* @return the time zone format associated with this date/time formatter.
* @internal ICU 49 technology preview
*/
virtual const TimeZoneFormat* getTimeZoneFormat() const;
/**
* Set a particular UDisplayContext value in the formatter, such as
* UDISPCTX_CAPITALIZATION_FOR_STANDALONE. Note: For getContext, see
* DateFormat.
* @param value The UDisplayContext value to set.
* @param status Input/output status. If at entry this indicates a failure
* status, the function will do nothing; otherwise this will be
* updated with any new status from the function.
* @stable ICU 53
*/
virtual void setContext(UDisplayContext value, UErrorCode& status) override;
/**
* Overrides base class method and
* This method clears per field NumberFormat instances
* previously set by {@see adoptNumberFormat(const UnicodeString&, NumberFormat*, UErrorCode)}
* @param formatToAdopt the NumbeferFormat used
* @stable ICU 54
*/
void adoptNumberFormat(NumberFormat *formatToAdopt) override;
/**
* Allow the user to set the NumberFormat for several fields
* It can be a single field like: "y"(year) or "M"(month)
* It can be several field combined together: "yM"(year and month)
* Note:
* 1 symbol field is enough for multiple symbol field (so "y" will override "yy", "yyy")
* If the field is not numeric, then override has no effect (like "MMM" will use abbreviation, not numerical field)
* Per field NumberFormat can also be cleared in {@see DateFormat::setNumberFormat(const NumberFormat& newNumberFormat)}
*
* @param fields the fields to override(like y)
* @param formatToAdopt the NumbeferFormat used
* @param status Receives a status code, which will be U_ZERO_ERROR
* if the operation succeeds.
* @stable ICU 54
*/
void adoptNumberFormat(const UnicodeString& fields, NumberFormat *formatToAdopt, UErrorCode &status);
/**
* Get the numbering system to be used for a particular field.
* @param field The UDateFormatField to get
* @stable ICU 54
*/
const NumberFormat * getNumberFormatForField(char16_t field) const;
#ifndef U_HIDE_INTERNAL_API
/**
* This is for ICU internal use only. Please do not use.
* Check whether the 'field' is smaller than all the fields covered in
* pattern, return true if it is. The sequence of calendar field,
* from large to small is: ERA, YEAR, MONTH, DATE, AM_PM, HOUR, MINUTE,...
* @param field the calendar field need to check against
* @return true if the 'field' is smaller than all the fields
* covered in pattern. false otherwise.
* @internal ICU 4.0
*/
UBool isFieldUnitIgnored(UCalendarDateFields field) const;
/**
* This is for ICU internal use only. Please do not use.
* Check whether the 'field' is smaller than all the fields covered in
* pattern, return true if it is. The sequence of calendar field,
* from large to small is: ERA, YEAR, MONTH, DATE, AM_PM, HOUR, MINUTE,...
* @param pattern the pattern to check against
* @param field the calendar field need to check against
* @return true if the 'field' is smaller than all the fields
* covered in pattern. false otherwise.
* @internal ICU 4.0
*/
static UBool isFieldUnitIgnored(const UnicodeString& pattern,
UCalendarDateFields field);
/**
* This is for ICU internal use only. Please do not use.
* Get the locale of this simple date formatter.
* It is used in DateIntervalFormat.
*
* @return locale in this simple date formatter
* @internal ICU 4.0
*/
const Locale& getSmpFmtLocale() const;
#endif /* U_HIDE_INTERNAL_API */
private:
friend class DateFormat;
friend class DateIntervalFormat;
void initializeDefaultCentury();
void initializeBooleanAttributes();
SimpleDateFormat() = delete; // default constructor not implemented
/**
* Used by the DateFormat factory methods to construct a SimpleDateFormat.
* @param timeStyle the time style.
* @param dateStyle the date style.
* @param locale the given locale.
* @param status Output param set to success/failure code on
* exit.
*/
SimpleDateFormat(EStyle timeStyle, EStyle dateStyle, const Locale& locale, UErrorCode& status);
/**
* Construct a SimpleDateFormat for the given locale. If no resource data
* is available, create an object of last resort, using hard-coded strings.
* This is an internal method, called by DateFormat. It should never fail.
* @param locale the given locale.
* @param status Output param set to success/failure code on
* exit.
*/
SimpleDateFormat(const Locale& locale, UErrorCode& status); // Use default pattern
/**
* Hook called by format(... FieldPosition& ...) and format(...FieldPositionIterator&...)
*/
UnicodeString& _format(Calendar& cal, UnicodeString& appendTo, FieldPositionHandler& handler, UErrorCode& status) const;
/**
* Called by format() to format a single field.
*
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param ch The format character we encountered in the pattern.
* @param count Number of characters in the current pattern symbol (e.g.,
* "yyyy" in the pattern would result in a call to this function
* with ch equal to 'y' and count equal to 4)
* @param capitalizationContext Capitalization context for this date format.
* @param fieldNum Zero-based numbering of current field within the overall format.
* @param handler Records information about field positions.
* @param cal Calendar to use
* @param status Receives a status code, which will be U_ZERO_ERROR if the operation
* succeeds.
*/
void subFormat(UnicodeString &appendTo,
char16_t ch,
int32_t count,
UDisplayContext capitalizationContext,
int32_t fieldNum,
char16_t fieldToOutput,
FieldPositionHandler& handler,
Calendar& cal,
UErrorCode& status) const; // in case of illegal argument
/**
* Used by subFormat() to format a numeric value.
* Appends to toAppendTo a string representation of "value"
* having a number of digits between "minDigits" and
* "maxDigits". Uses the DateFormat's NumberFormat.
*
* @param currentNumberFormat
* @param appendTo Output parameter to receive result.
* Formatted number is appended to existing contents.
* @param value Value to format.
* @param minDigits Minimum number of digits the result should have
* @param maxDigits Maximum number of digits the result should have
*/
void zeroPaddingNumber(const NumberFormat *currentNumberFormat,
UnicodeString &appendTo,
int32_t value,
int32_t minDigits,
int32_t maxDigits) const;
/**
* Return true if the given format character, occurring count
* times, represents a numeric field.
*/
static UBool isNumeric(char16_t formatChar, int32_t count);
/**
* Returns true if the patternOffset is at the start of a numeric field.
*/
static UBool isAtNumericField(const UnicodeString &pattern, int32_t patternOffset);
/**
* Returns true if the patternOffset is right after a non-numeric field.
*/
static UBool isAfterNonNumericField(const UnicodeString &pattern, int32_t patternOffset);
/**
* initializes fCalendar from parameters. Returns fCalendar as a convenience.
* @param adoptZone Zone to be adopted, or nullptr for TimeZone::createDefault().
* @param locale Locale of the calendar
* @param status Error code
* @return the newly constructed fCalendar
*/
Calendar *initializeCalendar(TimeZone* adoptZone, const Locale& locale, UErrorCode& status);
/**
* Called by several of the constructors to load pattern data and formatting symbols
* out of a resource bundle and initialize the locale based on it.
* @param timeStyle The time style, as passed to DateFormat::createDateInstance().
* @param dateStyle The date style, as passed to DateFormat::createTimeInstance().
* @param locale The locale to load the patterns from.
* @param status Filled in with an error code if loading the data from the
* resources fails.
*/
void construct(EStyle timeStyle, EStyle dateStyle, const Locale& locale, UErrorCode& status);
/**
* Called by construct() and the various constructors to set up the SimpleDateFormat's
* Calendar and NumberFormat objects.
* @param locale The locale for which we want a Calendar and a NumberFormat.
* @param status Filled in with an error code if creating either subobject fails.
*/
void initialize(const Locale& locale, UErrorCode& status);
/**
* Private code-size reduction function used by subParse.
* @param text the time text being parsed.
* @param start where to start parsing.
* @param field the date field being parsed.
* @param stringArray the string array to parsed.
* @param stringArrayCount the size of the array.
* @param monthPattern pointer to leap month pattern, or nullptr if none.
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @return the new start position if matching succeeded; a negative number
* indicating matching failure, otherwise.
*/
int32_t matchString(const UnicodeString& text, int32_t start, UCalendarDateFields field,
const UnicodeString* stringArray, int32_t stringArrayCount,
const UnicodeString* monthPattern, Calendar& cal) const;
/**
* Private code-size reduction function used by subParse. Only for UCAL_MONTH
* @param text the time text being parsed.
* @param start where to start parsing.
* @param wideStringArray the wide string array to parsed.
* @param shortStringArray the short string array to parsed.
* @param stringArrayCount the size of the string arrays.
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @return the new start position if matching succeeded; a negative number
* indicating matching failure, otherwise.
*/
int32_t matchAlphaMonthStrings(const UnicodeString& text, int32_t start,
const UnicodeString* wideStringArray, const UnicodeString* shortStringArray,
int32_t stringArrayCount, Calendar& cal) const;
/**
* Private code-size reduction function used by subParse.
* @param text the time text being parsed.
* @param start where to start parsing.
* @param field the date field being parsed.
* @param stringArray the string array to parsed.
* @param stringArrayCount the size of the array.
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @return the new start position if matching succeeded; a negative number
* indicating matching failure, otherwise.
*/
int32_t matchQuarterString(const UnicodeString& text, int32_t start, UCalendarDateFields field,
const UnicodeString* stringArray, int32_t stringArrayCount, Calendar& cal) const;
/**
* Used by subParse() to match localized day period strings.
*/
int32_t matchDayPeriodStrings(const UnicodeString& text, int32_t start,
const UnicodeString* stringArray, int32_t stringArrayCount,
int32_t &dayPeriod) const;
/**
* Private function used by subParse to match literal pattern text.
*
* @param pattern the pattern string
* @param patternOffset the starting offset into the pattern text. On
* output will be set the offset of the first non-literal character in the pattern
* @param text the text being parsed
* @param textOffset the starting offset into the text. On output
* will be set to the offset of the character after the match
* @param whitespaceLenient <code>true</code> if whitespace parse is lenient, <code>false</code> otherwise.
* @param partialMatchLenient <code>true</code> if partial match parse is lenient, <code>false</code> otherwise.
* @param oldLeniency <code>true</code> if old leniency control is lenient, <code>false</code> otherwise.
*
* @return <code>true</code> if the literal text could be matched, <code>false</code> otherwise.
*/
static UBool matchLiterals(const UnicodeString &pattern, int32_t &patternOffset,
const UnicodeString &text, int32_t &textOffset,
UBool whitespaceLenient, UBool partialMatchLenient, UBool oldLeniency);
/**
* Private member function that converts the parsed date strings into
* timeFields. Returns -start (for ParsePosition) if failed.
* @param text the time text to be parsed.
* @param start where to start parsing.
* @param ch the pattern character for the date field text to be parsed.
* @param count the count of a pattern character.
* @param obeyCount if true then the count is strictly obeyed.
* @param allowNegative
* @param ambiguousYear If true then the two-digit year == the default start year.
* @param saveHebrewMonth Used to hang onto month until year is known.
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @param patLoc
* @param numericLeapMonthFormatter If non-null, used to parse numeric leap months.
* @param tzTimeType the type of parsed time zone - standard, daylight or unknown (output).
* This parameter can be nullptr if caller does not need the information.
* @return the new start position if matching succeeded; a negative number
* indicating matching failure, otherwise.
*/
int32_t subParse(const UnicodeString& text, int32_t& start, char16_t ch, int32_t count,
UBool obeyCount, UBool allowNegative, UBool ambiguousYear[], int32_t& saveHebrewMonth, Calendar& cal,
int32_t patLoc, MessageFormat * numericLeapMonthFormatter, UTimeZoneFormatTimeType *tzTimeType,
int32_t *dayPeriod=nullptr) const;
void parseInt(const UnicodeString& text,
Formattable& number,
ParsePosition& pos,
UBool allowNegative,
const NumberFormat *fmt) const;
void parseInt(const UnicodeString& text,
Formattable& number,
int32_t maxDigits,
ParsePosition& pos,
UBool allowNegative,
const NumberFormat *fmt) const;
int32_t checkIntSuffix(const UnicodeString& text, int32_t start,
int32_t patLoc, UBool isNegative) const;
/**
* Counts number of digit code points in the specified text.
*
* @param text input text
* @param start start index, inclusive
* @param end end index, exclusive
* @return number of digits found in the text in the specified range.
*/
int32_t countDigits(const UnicodeString& text, int32_t start, int32_t end) const;
/**
* Translate a pattern, mapping each character in the from string to the
* corresponding character in the to string. Return an error if the original
* pattern contains an unmapped character, or if a quote is unmatched.
* Quoted (single quotes only) material is not translated.
* @param originalPattern the original pattern.
* @param translatedPattern Output param to receive the translited pattern.
* @param from the characters to be translited from.
* @param to the characters to be translited to.
* @param status Receives a status code, which will be U_ZERO_ERROR
* if the operation succeeds.
*/
static void translatePattern(const UnicodeString& originalPattern,
UnicodeString& translatedPattern,
const UnicodeString& from,
const UnicodeString& to,
UErrorCode& status);
/**
* Sets the starting date of the 100-year window that dates with 2-digit years
* are considered to fall within.
* @param startDate the start date
* @param status Receives a status code, which will be U_ZERO_ERROR
* if the operation succeeds.
*/
void parseAmbiguousDatesAsAfter(UDate startDate, UErrorCode& status);
/**
* Return the length matched by the given affix, or -1 if none.
* Runs of white space in the affix, match runs of white space in
* the input.
* @param affix pattern string, taken as a literal
* @param input input text
* @param pos offset into input at which to begin matching
* @return length of input that matches, or -1 if match failure
*/
int32_t compareSimpleAffix(const UnicodeString& affix,
const UnicodeString& input,
int32_t pos) const;
/**
* Skip over a run of zero or more Pattern_White_Space characters at
* pos in text.
*/
int32_t skipPatternWhiteSpace(const UnicodeString& text, int32_t pos) const;
/**
* Skip over a run of zero or more isUWhiteSpace() characters at pos
* in text.
*/
int32_t skipUWhiteSpace(const UnicodeString& text, int32_t pos) const;
/**
* Initialize SimpleNumberFormat instance
*/
void initSimpleNumberFormatter(UErrorCode &status);
/**
* Initialize NumberFormat instances used for numbering system overrides.
*/
void initNumberFormatters(const Locale &locale,UErrorCode &status);
/**
* Parse the given override string and set up structures for number formats
*/
void processOverrideString(const Locale &locale, const UnicodeString &str, int8_t type, UErrorCode &status);
/**
* Used to map pattern characters to Calendar field identifiers.
*/
static const UCalendarDateFields fgPatternIndexToCalendarField[];
/**
* Map index into pattern character string to DateFormat field number
*/
static const UDateFormatField fgPatternIndexToDateFormatField[];
/**
* Lazy TimeZoneFormat instantiation, semantically const
*/
TimeZoneFormat *tzFormat(UErrorCode &status) const;
const NumberFormat* getNumberFormatByIndex(UDateFormatField index) const;
/**
* Used to map Calendar field to field level.
* The larger the level, the smaller the field unit.
* For example, UCAL_ERA level is 0, UCAL_YEAR level is 10,
* UCAL_MONTH level is 20.
*/
static const int32_t fgCalendarFieldToLevel[];
/**
* Map calendar field letter into calendar field level.
*/
static int32_t getLevelFromChar(char16_t ch);
/**
* Tell if a character can be used to define a field in a format string.
*/
static UBool isSyntaxChar(char16_t ch);
/**
* The formatting pattern for this formatter.
*/
UnicodeString fPattern;
/**
* The numbering system override for dates.
*/
UnicodeString fDateOverride;
/**
* The numbering system override for times.
*/
UnicodeString fTimeOverride;
/**
* The original locale used (for reloading symbols)
*/
Locale fLocale;
/**
* A pointer to an object containing the strings to use in formatting (e.g.,
* month and day names, AM and PM strings, time zone names, etc.)
*/
DateFormatSymbols* fSymbols = nullptr; // Owned
/**
* The time zone formatter
*/
TimeZoneFormat* fTimeZoneFormat = nullptr;
/**
* If dates have ambiguous years, we map them into the century starting
* at defaultCenturyStart, which may be any date. If defaultCenturyStart is
* set to SYSTEM_DEFAULT_CENTURY, which it is by default, then the system
* values are used. The instance values defaultCenturyStart and
* defaultCenturyStartYear are only used if explicitly set by the user
* through the API method parseAmbiguousDatesAsAfter().
*/
UDate fDefaultCenturyStart;
UBool fHasMinute;
UBool fHasSecond;
UBool fHasHanYearChar; // pattern contains the Han year character \u5E74
/**
* Sets fHasMinutes and fHasSeconds.
*/
void parsePattern();
/**
* See documentation for defaultCenturyStart.
*/
/*transient*/ int32_t fDefaultCenturyStartYear;
struct NSOverride : public UMemory {
const SharedNumberFormat *snf;
int32_t hash;
NSOverride *next;
void free();
NSOverride() : snf(nullptr), hash(0), next(nullptr) {
}
~NSOverride();
};
/**
* The number format in use for each date field. nullptr means fall back
* to fNumberFormat in DateFormat.
*/
const SharedNumberFormat **fSharedNumberFormatters = nullptr;
/**
* Number formatter pre-allocated for fast performance
*
* This references the decimal symbols from fNumberFormatter if it is an instance
* of DecimalFormat (and is otherwise null). This should always be cleaned up before
* destroying fNumberFormatter.
*/
const number::SimpleNumberFormatter* fSimpleNumberFormatter = nullptr;
UBool fHaveDefaultCentury;
const BreakIterator* fCapitalizationBrkIter = nullptr;
};
inline UDate
SimpleDateFormat::get2DigitYearStart(UErrorCode& /*status*/) const
{
return fDefaultCenturyStart;
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // _SMPDTFMT
//eof