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haiku/headers/libs/icu/unicode/smpdtfmt.h
Oliver Tappe 75f1522155 * reintegrated gsoc-locale-kit branch into trunk - there's more 
work to do, but it's about time to give this code more exposure.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33176 a95241bf-73f2-0310-859d-f6bbb57e9c96
2009-09-18 22:23:34 +00:00

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/*
* Copyright (C) 1997-2009, 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"
/**
* \file
* \brief C++ API: Format and parse dates in a language-independent manner.
*/
#if !UCONFIG_NO_FORMATTING
#include "unicode/datefmt.h"
U_NAMESPACE_BEGIN
class DateFormatSymbols;
class DateFormat;
class MessageFormat;
/**
*
* 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. 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>
* Date/Time format syntax:
* <P>
* The date/time format is specified by means of a string time pattern. In this
* pattern, all ASCII letters are reserved as pattern letters, which are defined
* as the following:
* <pre>
* \code
* Symbol Meaning Presentation Example
* ------ ------- ------------ -------
* G era designator (Text) AD
* y year (Number) 1996
* Y year (week of year) (Number) 1997
* u extended year (Number) 4601
* Q Quarter (Text & Number) Q2 & 02
* M month in year (Text & Number) July & 07
* d day in month (Number) 10
* h hour in am/pm (1~12) (Number) 12
* H hour in day (0~23) (Number) 0
* m minute in hour (Number) 30
* s second in minute (Number) 55
* S fractional second (Number) 978
* E day of week (Text) Tuesday
* e day of week (local 1~7) (Text & Number) Tues & 2
* D day in year (Number) 189
* F day of week in month (Number) 2 (2nd Wed in July)
* w week in year (Number) 27
* W week in month (Number) 2
* a am/pm marker (Text) PM
* k hour in day (1~24) (Number) 24
* K hour in am/pm (0~11) (Number) 0
* z time zone (Time) Pacific Standard Time
* Z time zone (RFC 822) (Number) -0800
* v time zone (generic) (Text) Pacific Time
* V time zone (abreviation) (Text) PT
* VVVV time zone (location) (Text) United States (Los Angeles)
* g Julian day (Number) 2451334
* A milliseconds in day (Number) 69540000
* q stand alone quarter (Text & Number) Q2 & 02
* L stand alone month (Text & Number) July & 07
* c stand alone day of week (Text & Number) Tuesday & 2
* ' escape for text (Delimiter) 'Date='
* '' single quote (Literal) 'o''clock'
* \endcode
* </pre>
* The count of pattern letters determine the format.
* <P>
* (Text): 4 or more, use full form, &lt;4, use short or abbreviated form if it
* exists. (e.g., "EEEE" produces "Monday", "EEE" produces "Mon")
* <P>
* (Number): the minimum number of digits. Shorter numbers are zero-padded to
* this amount (e.g. if "m" produces "6", "mm" produces "06"). Year is handled
* specially; that is, if the count of 'y' is 2, the Year will be truncated to 2 digits.
* (e.g., if "yyyy" produces "1997", "yy" produces "97".)
* Unlike other fields, fractional seconds are padded on the right with zero.
* <P>
* (Text & Number): 3 or over, use text, otherwise use number. (e.g., "M" produces "1",
* "MM" produces "01", "MMM" produces "Jan", and "MMMM" produces "January".)
* <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(0);
* 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, using the
* same pattern, as Jan 2, 3 AD. Likewise, "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 formattied 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.
* @draft 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 formattied 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.
* @draft 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 Format* clone(void) const;
/**
* 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 UBool operator==(const Format& other) const;
/**
* 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;
/**
* 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 obj A Formattable containing the date-time value to be formatted
* into a date-time string. If the type of the Formattable
* is a numeric type, it is treated as if it were an
* instance of Date.
* @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.
* @param status Output param set to success/faulure code.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
virtual UnicodeString& format( const Formattable& obj,
UnicodeString& appendTo,
FieldPosition& pos,
UErrorCode& status) const;
/**
* Redeclared DateFormat method.
* @param date the Date value to be formatted.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param fieldPosition 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
*/
UnicodeString& format(UDate date,
UnicodeString& appendTo,
FieldPosition& fieldPosition) const;
/**
* Redeclared DateFormat method.
* @param obj Object to be formatted.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @param status Input/output success/failure code.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
UnicodeString& format(const Formattable& obj,
UnicodeString& appendTo,
UErrorCode& status) const;
/**
* Redeclared DateFormat method.
* @param date Date value to be formatted.
* @param appendTo Output parameter to receive result.
* Result is appended to existing contents.
* @return Reference to 'appendTo' parameter.
* @stable ICU 2.0
*/
UnicodeString& format(UDate date, UnicodeString& appendTo) const;
/**
* 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).
*
* @param text The date/time string to be parsed
* @param cal a Calendar set to the date and time to be formatted
* into a date/time string.
* @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.
* @return A valid UDate if the input could be parsed.
* @stable ICU 2.1
*/
virtual void parse( const UnicodeString& text,
Calendar& cal,
ParsePosition& pos) const;
/**
* Parse a date/time string starting 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 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.
* @return A valid UDate if the input could be parsed.
* @stable ICU 2.0
*/
UDate parse( const UnicodeString& text,
ParsePosition& pos) const;
/**
* Parse a date/time string. For example, a time text "07/10/96 4:5 PM, PDT"
* will be parsed into a UDate that is equivalent to Date(837039928046).
* Parsing begins at the beginning of the string and proceeds as far as
* possible. Assuming no parse errors were encountered, this function
* doesn't return any information about how much of the string was consumed
* by the parsing. If you need that information, use the version of
* parse() that takes a ParsePosition.
*
* @param text The date/time string to be parsed
* @param status Filled in with U_ZERO_ERROR if the parse was successful, and with
* an error value if there was a parse error.
* @return A valid UDate if the input could be parsed.
* @stable ICU 2.0
*/
virtual UDate parse( const UnicodeString& text,
UErrorCode& status) const;
/**
* 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.
*
* @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(void) 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(void);
/**
* 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(void) const;
/**
* 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);
/**
* 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(void) const;
private:
friend class DateFormat;
void initializeDefaultCentury(void);
SimpleDateFormat(); // 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
/**
* 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 pos The FieldPosition being filled in by the format() call. If
* this function is formatting the field specfied by pos, it
* will fill in pos with the beginning and ending offsets of the
* field.
* @param status Receives a status code, which will be U_ZERO_ERROR if the operation
* succeeds.
*/
void subFormat( UnicodeString &appendTo,
UChar ch,
int32_t count,
FieldPosition& pos,
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 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( NumberFormat *currentNumberFormat,
UnicodeString &appendTo,
int32_t value,
int32_t minDigits,
int32_t maxDigits) const;
/**
* Return true if the given format character, occuring count
* times, represents a numeric field.
*/
static UBool isNumeric(UChar formatChar, int32_t count);
/**
* initializes fCalendar from parameters. Returns fCalendar as a convenience.
* @param adoptZone Zone to be adopted, or NULL 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);
/**
* initializes fSymbols from parameters.
* @param locale Locale of the symbols
* @param calendar Alias to Calendar that will be used.
* @param status Error code
*/
void initializeSymbols(const Locale& locale, Calendar* calendar, 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 statuc 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 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, 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;
/**
* 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 ambiguousYear If true then the two-digit year == the default start year.
* @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 subParse(const UnicodeString& text, int32_t& start, UChar ch, int32_t count,
UBool obeyCount, UBool allowNegative, UBool ambiguousYear[], Calendar& cal,
int32_t patLoc) const;
void parseInt(const UnicodeString& text,
Formattable& number,
ParsePosition& pos,
UBool allowNegative,
NumberFormat *fmt) const;
void parseInt(const UnicodeString& text,
Formattable& number,
int32_t maxDigits,
ParsePosition& pos,
UBool allowNegative,
NumberFormat *fmt) const;
int32_t checkIntSuffix(const UnicodeString& text, int32_t start,
int32_t patLoc, UBool isNegative) 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 isRuleWhiteSpace() characters at
* pos in text.
*/
int32_t skipRuleWhiteSpace(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;
/**
* Private methods for formatting/parsing GMT string
*/
void appendGMT(NumberFormat *currentNumberFormat,UnicodeString &appendTo, Calendar& cal, UErrorCode& status) const;
void formatGMTDefault(NumberFormat *currentNumberFormat,UnicodeString &appendTo, int32_t offset) const;
int32_t parseGMT(const UnicodeString &text, ParsePosition &pos) const;
int32_t parseGMTDefault(const UnicodeString &text, ParsePosition &pos) const;
UBool isDefaultGMTFormat() const;
void formatRFC822TZ(UnicodeString &appendTo, int32_t offset) const;
/**
* Initialize MessageFormat instances used for GMT formatting/parsing
*/
void initGMTFormatters(UErrorCode &status);
/**
* Initialize NumberFormat instances used for numbering system overrides.
*/
void initNumberFormatters(const Locale &locale,UErrorCode &status);
/**
* Get the numbering system to be used for a particular field.
*/
NumberFormat * getNumberFormatByIndex(UDateFormatField index) const;
/**
* 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[];
/**
* 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[];
static const int32_t fgPatternCharToLevel[];
/**
* 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; // Owned
/**
* 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;
/**
* See documentation for defaultCenturyStart.
*/
/*transient*/ int32_t fDefaultCenturyStartYear;
enum ParsedTZType {
TZTYPE_UNK,
TZTYPE_STD,
TZTYPE_DST
};
ParsedTZType tztype; // here to avoid api change
typedef struct NSOverride {
NumberFormat *nf;
int32_t hash;
NSOverride *next;
} NSOverride;
/*
* MessageFormat instances used for localized GMT format
*/
enum {
kGMTNegativeHMS = 0,
kGMTNegativeHM,
kGMTPositiveHMS,
kGMTPositiveHM,
kNumGMTFormatters
};
enum {
kGMTNegativeHMSMinLenIdx = 0,
kGMTPositiveHMSMinLenIdx,
kNumGMTFormatMinLengths
};
MessageFormat **fGMTFormatters;
// If a GMT hour format has a second field, we need to make sure
// the length of input localized GMT string must match the expected
// length. Otherwise, sub DateForamt handling offset format may
// unexpectedly success parsing input GMT string without second field.
// See #6880 about this issue.
// TODO: SimpleDateFormat should provide an option to invalidate
//
int32_t fGMTFormatHmsMinLen[kNumGMTFormatMinLengths];
NumberFormat **fNumberFormatters;
NSOverride *fOverrideList;
UBool fHaveDefaultCentury;
};
inline UDate
SimpleDateFormat::get2DigitYearStart(UErrorCode& /*status*/) const
{
return fDefaultCenturyStart;
}
inline UnicodeString&
SimpleDateFormat::format(const Formattable& obj,
UnicodeString& appendTo,
UErrorCode& status) const {
// Don't use Format:: - use immediate base class only,
// in case immediate base modifies behavior later.
return DateFormat::format(obj, appendTo, status);
}
inline UnicodeString&
SimpleDateFormat::format(UDate date,
UnicodeString& appendTo,
FieldPosition& fieldPosition) const {
// Don't use Format:: - use immediate base class only,
// in case immediate base modifies behavior later.
return DateFormat::format(date, appendTo, fieldPosition);
}
inline UnicodeString&
SimpleDateFormat::format(UDate date, UnicodeString& appendTo) const {
return DateFormat::format(date, appendTo);
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // _SMPDTFMT
//eof
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