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scuffed-code/icu4c/source/i18n/unicode/udat.h

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ICU-12 all public include files are now in unicode dir, all private icu_ functions renamed to uprv_ X-SVN-Rev: 473
1999-12-28 23:57:50 +00:00
/*
*******************************************************************************
* Copyright <EFBFBD> {1996-1999}, International Business Machines Corporation and others. All Rights Reserved.
*******************************************************************************
*/
#ifndef UDAT_H
#define UDAT_H
#include "unicode/utypes.h"
#include "unicode/ucal.h"
#include "unicode/unum.h"
/**
* @name Date Format C API
*
* Date Format C API consists of functions that convert dates and
* times from their internal representations to textual form and back again in a
* language-independent manner. Converting from the internal representation (milliseconds
* since midnight, January 1, 1970) to text is known as "formatting," and converting
* from text to millis is known as "parsing." We currently define only one concrete
* structure UDateFormat, which can handle pretty much all normal
* date formatting and parsing actions.
* <P>
* Date Format helps you to format and parse dates for any locale. Your code can
* be completely independent of the locale conventions for months, days of the
* week, or even the calendar format: lunar vs. solar.
* <P>
* To format a date for the current Locale with default time and date style,
* use one of the static factory methods:
* <pre>
* . UErrorCode status;
* . UFieldPosition pos;
* . UChar *myString;
* . t_int32 myStrlen=0;
* . UDateFormat* dfmt = udat_open(UCAL_DEFAULT, UCAL_DEFAULT, NULL, "PST", &status);
* . myStrlen = udat_format(dfmt, myDate, NULL, myStrlen, &pos, &status);
* . if(status==U_BUFFER_OVERFLOW_ERROR){
* . status=U_ZERO_ERROR;
* . myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
* . udat_format(dfmt, myDate, myString, myStrlen+1, &pos, &status);
* . }
* </pre>
* If you are formatting multiple numbers, it is more efficient to get the
* format and use it multiple times so that the system doesn't have to fetch the
* information about the local language and country conventions multiple times.
* <pre>
* . t_int32 i, myStrlen=0;
* . UChar* myString;
* . UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
* . UDateFormat* df = udat_open(UCAL_DEFAULT, UCAL_DEFAULT, NULL, "GMT", &status);
* . for (i = 0; i < 3; ++i) {
* . myStrlen = udat_format(df, myDate, NULL, myStrlen, &pos, &status);
* . if(status==U_BUFFER_OVERFLOW_ERROR){
* . status=U_ZERO_ERROR;
* . myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
* . udat_format(df, myDate, myString, myStrlen+1, &pos, &status);
* . }
* . printf("%s \n", austrdup(myString) ); //austrdup( a function used to convert UChar* to char*)
* . free(myString);
* . }
* </pre>
* To format a date for a different Locale, specify it in the call to
* udat_open()
* <pre>
* . UDateFormat* df = udat_open(UDAT_SHORT, UDAT_SHORT, "fr_FR", "GMT", &status);
* </pre>
* You can use a DateFormat API udat_parse() to parse.
* <pre>
* . UErrorCode status = U_ZERO_ERROR;
* . t_int32 parsepos=0;
* . UDate myDate = udat_parse(df, myString, u_strlen(myString), &parsepos, &status);
* </pre>
* . You can pass in different options for the arguments for date and time style
* . to control the length of the result; from SHORT to MEDIUM to LONG to FULL.
* . The exact result depends on the locale, but generally:
* . see UDateFormatStyle for more details
* <ul type=round>
* <li> UDAT_SHORT is completely numeric, such as 12/13/52 or 3:30pm
* <li> UDAT_MEDIUM is longer, such as Jan 12, 1952
* <li> UDAT_LONG is longer, such as January 12, 1952 or 3:30:32pm
* <li> UDAT_FULL is pretty completely specified, such as
* Tuesday, April 12, 1952 AD or 3:30:42pm PST.
* </ul>
* You can also set the time zone on the format if you wish.
* <P>
* You can also use forms of the parse and format methods with Parse Position and
* UFieldPosition to allow you to
* <ul type=round>
* <li> Progressively parse through pieces of a string.
* <li> Align any particular field, or find out where it is for selection
* on the screen.
* </ul>
*/
/** A date formatter.
* For usage in C programs.
*/
typedef void* UDateFormat;
/** The possible date/time format styles */
enum UDateFormatStyle {
/** Full style */
UDAT_FULL,
/** Long style */
UDAT_LONG,
/** Medium style */
UDAT_MEDIUM,
/** Short style */
UDAT_SHORT,
/** Default style */
UDAT_DEFAULT = UDAT_MEDIUM,
/** No style */
UDAT_NONE = -1
};
typedef enum UDateFormatStyle UDateFormatStyle;
/**
* Open a new UDateFormat for formatting and parsing dates and times.
* A UDateFormat may be used to format dates in calls to \Ref{udat_format},
* and to parse dates in calls to \Ref{udat_parse}.
* @param timeStyle The style used to format times; one of UDAT_FULL_STYLE, UDAT_LONG_STYLE,
* UDAT_MEDIUM_STYLE, UDAT_SHORT_STYLE, or UDAT_DEFAULT_STYLE
* @param dateStyle The style used to format dates; one of UDAT_FULL_STYLE, UDAT_LONG_STYLE,
* UDAT_MEDIUM_STYLE, UDAT_SHORT_STYLE, or UDAT_DEFAULT_STYLE
* @param locale The locale specifying the formatting conventions
* @param tzID A timezone ID specifying the timezone to use. If 0, use
* the default timezone.
* @param tzIDLength The length of tzID, or -1 if null-terminated.
* @param status A pointer to an UErrorCode to receive any errors
* @return A pointer to a UDateFormat to use for formatting dates and times, or 0 if
* an error occurred.
* @see udat_openPattern
*/
U_CAPI UDateFormat*
udat_open(UDateFormatStyle timeStyle,
UDateFormatStyle dateStyle,
const char *locale,
const UChar *tzID,
int32_t tzIDLength,
UErrorCode *status);
/**
* Open a new UDateFormat for formatting dates and times.
* A UDateFormat may be used to format dates in calls to \Ref{udat_format},
* and to parse dates in calls to \Ref{udat_parse}.
* @param pattern A pattern specifying the format to use.
* @param patternLength The number of characters in the pattern, or -1 if null-terminated.
* @param locale The locale specifying the formatting conventions
* @param status A pointer to an UErrorCode to receive any errors
* @return A pointer to a UDateFormat to use for formatting dates and times, or 0 if
* an error occurred.
* @see udat_open
*/
U_CAPI UDateFormat*
udat_openPattern( const UChar *pattern,
int32_t patternLength,
const char *locale,
UErrorCode *status);
/**
* Close a UDateFormat.
* Once closed, a UDateFormat may no longer be used.
* @param fmt The formatter to close.
*/
U_CAPI void
udat_close(UDateFormat* format);
/**
* Open a copy of a UDateFormat.
* This function performs a deep copy.
* @param fmt The format to copy
* @param status A pointer to an UErrorCode to receive any errors.
* @return A pointer to a UDateFormat identical to fmt.
*/
U_CAPI UDateFormat*
udat_clone(const UDateFormat *fmt,
UErrorCode *status);
/**
* Format a date using an UDateFormat.
* The date will be formatted using the conventions specified in \Ref{udat_open}
* or \Ref{udat_openPattern}
* @param format The formatter to use
* @param dateToFormat The date to format
* @param result A pointer to a buffer to receive the formatted number.
* @param resultLength The maximum size of result.
* @param pos If not 0, a UFieldPosition which will receive the information on a specific field.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_parse
*/
U_CAPI int32_t
udat_format( const UDateFormat* format,
UDate dateToFormat,
UChar* result,
int32_t resultLength,
UFieldPosition* position,
UErrorCode* status);
/**
* Parse a string into an date/time using a UDateFormat.
* The date will be parsed using the conventions specified in \Ref{udat_open}
* or \Ref{udat_openPattern}
* @param fmt The formatter to use.
* @param text The text to parse.
* @param textLength The length of text, or -1 if null-terminated.
* @param parsePos If not 0, on input a pointer to an integer specifying the offset at which
* to begin parsing. If not 0, on output the offset at which parsing ended.
* @param status A pointer to an UErrorCode to receive any errors
* @return The value of the parsed date/time
* @see udat_format
*/
U_CAPI UDate
udat_parse( const UDateFormat* format,
const UChar* text,
int32_t textLength,
int32_t *parsePos,
UErrorCode *status);
/**
* Determine if an UDateFormat will perform lenient parsing.
* With lenient parsing, the parser may use heuristics to interpret inputs that do not
* precisely match the pattern. With strict parsing, inputs must match the pattern.
* @param fmt The formatter to query
* @return TRUE if fmt is set to perform lenient parsing, FALSE otherwise.
* @see udat_setLenient
*/
U_CAPI bool_t
udat_isLenient(const UDateFormat* fmt);
/**
* Specify whether an UDateFormat will perform lenient parsing.
* With lenient parsing, the parser may use heuristics to interpret inputs that do not
* precisely match the pattern. With strict parsing, inputs must match the pattern.
* @param fmt The formatter to set
* @param isLenient TRUE if fmt should perform lenient parsing, FALSE otherwise.
* @see dat_isLenient
*/
U_CAPI void
udat_setLenient( UDateFormat* fmt,
bool_t isLenient);
/**
* Get the UCalendar associated with an UDateFormat.
* A UDateFormat uses a UCalendar to convert a raw value to, for example,
* the day of the week.
* @param fmt The formatter to query.
* @return A pointer to the UCalendar used by fmt.
* @see udat_setCalendar
*/
U_CAPI const UCalendar*
udat_getCalendar(const UDateFormat* fmt);
/**
* Set the UCalendar associated with an UDateFormat.
* A UDateFormat uses a UCalendar to convert a raw value to, for example,
* the day of the week.
* @param fmt The formatter to set.
* @param calendarToSet A pointer to an UCalendar to be used by fmt.
* @see udat_setCalendar
*/
U_CAPI void
udat_setCalendar( UDateFormat* fmt,
const UCalendar* calendarToSet);
/**
* Get the UNumberFormat associated with an UDateFormat.
* A UDateFormat uses a UNumberFormat to format numbers within a date,
* for example the day number.
* @param fmt The formatter to query.
* @return A pointer to the UNumberFormat used by fmt to format numbers.
* @see udat_setNumberFormat
*/
U_CAPI const UNumberFormat*
udat_getNumberFormat(const UDateFormat* fmt);
/**
* Set the UNumberFormat associated with an UDateFormat.
* A UDateFormat uses a UNumberFormat to format numbers within a date,
* for example the day number.
* @param fmt The formatter to set.
* @param numberFormatToSet A pointer to the UNumberFormat to be used by fmt to format numbers.
* @see udat_getNumberFormat
*/
U_CAPI void
udat_setNumberFormat( UDateFormat* fmt,
const UNumberFormat* numberFormatToSet);
/**
* Get a locale for which date/time formatting patterns are available.
* A UDateFormat in a locale returned by this function will perform the correct
* formatting and parsing for the locale.
* @param index The index of the desired locale.
* @return A locale for which date/time formatting patterns are available, or 0 if none.
* @see udat_countAvailable
*/
U_CAPI const char*
udat_getAvailable(int32_t index);
/**
* Determine how many locales have date/time formatting patterns available.
* This function is most useful as determining the loop ending condition for
* calls to \Ref{udat_getAvailable}.
* @return The number of locales for which date/time formatting patterns are available.
* @see udat_getAvailable
*/
U_CAPI int32_t
udat_countAvailable(void);
/**
* Get the year relative to which all 2-digit years are interpreted.
* For example, if the 2-digit start year is 2100, the year 99 will be
* interpreted as 2199.
* @param fmt The formatter to query.
* @param status A pointer to an UErrorCode to receive any errors
* @return The year relative to which all 2-digit years are interpreted.
* @see udat_Set2DigitYearStart
*/
U_CAPI UDate
udat_get2DigitYearStart( const UDateFormat *fmt,
UErrorCode *status);
/**
* Set the year relative to which all 2-digit years will be interpreted.
* For example, if the 2-digit start year is 2100, the year 99 will be
* interpreted as 2199.
* @param fmt The formatter to set.
* @param d The year relative to which all 2-digit years will be interpreted.
* @param status A pointer to an UErrorCode to receive any errors
* @see udat_Set2DigitYearStart
*/
U_CAPI void
udat_set2DigitYearStart( UDateFormat *fmt,
UDate d,
UErrorCode *status);
/**
* Extract the pattern from a UDateFormat.
* The pattern will follow the pattern syntax rules.
* @param fmt The formatter to query.
* @param localized TRUE if the pattern should be localized, FALSE otherwise.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_applyPattern
*/
U_CAPI int32_t
udat_toPattern( const UDateFormat *fmt,
bool_t localized,
UChar *result,
int32_t resultLength,
UErrorCode *status);
/**
* Set the pattern used by an UDateFormat.
* The pattern should follow the pattern syntax rules.
* @param fmt The formatter to set.
* @param localized TRUE if the pattern is localized, FALSE otherwise.
* @param pattern The new pattern
* @param patternLength The length of pattern, or -1 if null-terminated.
* @see udat_toPattern
*/
U_CAPI void
udat_applyPattern( UDateFormat *format,
bool_t localized,
const UChar *pattern,
int32_t patternLength);
/** The possible types of date format symbols */
enum UDateFormatSymbolType {
/** The era names, for example AD */
UDAT_ERAS,
/** The month names, for example February */
UDAT_MONTHS,
/** The short month names, for example Feb. */
UDAT_SHORT_MONTHS,
/** The weekday names, for example Monday */
UDAT_WEEKDAYS,
/** The short weekday names, for example Mon. */
UDAT_SHORT_WEEKDAYS,
/** The AM/PM names, for example AM */
UDAT_AM_PMS,
/** The localized characters */
UDAT_LOCALIZED_CHARS
};
typedef enum UDateFormatSymbolType UDateFormatSymbolType;
/** Date format symbols.
* For usage in C programs.
*/
struct UDateFormatSymbols;
typedef struct UDateFormatSymbols UDateFormatSymbols;
/**
* Get the symbols associated with an UDateFormat.
* The symbols are what a UDateFormat uses to represent locale-specific data,
* for example month or day names.
* @param fmt The formatter to query.
* @param type The type of symbols to get. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @param index The desired symbol of type type.
* @param result A pointer to a buffer to receive the pattern.
* @param resultLength The maximum size of result.
* @param status A pointer to an UErrorCode to receive any errors
* @return The total buffer size needed; if greater than resultLength, the output was truncated.
* @see udat_countSymbols
* @see udat_setSymbols
*/
U_CAPI int32_t
udat_getSymbols(const UDateFormat *fmt,
UDateFormatSymbolType type,
int32_t index,
UChar *result,
int32_t resultLength,
UErrorCode *status);
/**
* Count the number of particular symbols for an UDateFormat.
* This function is most useful as for detemining the loop termination condition
* for calls to \Ref{udat_getSymbols}.
* @param fmt The formatter to query.
* @param type The type of symbols to count. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @return The number of symbols of type type.
* @see udat_getSymbols
* @see udat_setSymbols
*/
U_CAPI int32_t
udat_countSymbols( const UDateFormat *fmt,
UDateFormatSymbolType type);
/**
* Set the symbols associated with an UDateFormat.
* The symbols are what a UDateFormat uses to represent locale-specific data,
* for example month or day names.
* @param fmt The formatter to set
* @param type The type of symbols to set. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
* @param index The index of the symbol to set of type type.
* @param value The new value
* @param valueLength The length of value, or -1 if null-terminated
* @param status A pointer to an UErrorCode to receive any errors
* @return A pointer to result.
* @see udat_getSymbols
* @see udat_countSymbols
*/
U_CAPI void
udat_setSymbols( UDateFormat *format,
UDateFormatSymbolType type,
int32_t index,
UChar *value,
int32_t valueLength,
UErrorCode *status);
#endif
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