udatpg.h File Reference

C API: Wrapper for DateTimePatternGenerator (unicode/dtptngen.h). More...

#include "unicode/utypes.h"
#include "unicode/uenum.h"
#include "unicode/localpointer.h"

Go to the source code of this file.

Typedefs
typedef void *	UDateTimePatternGenerator
	Opaque type for a date/time pattern generator object. More...
typedef enum UDateTimePatternField	UDateTimePatternField
	Field number constants for udatpg_getAppendItemFormats() and similar functions. More...
typedef enum UDateTimePatternMatchOptions	UDateTimePatternMatchOptions
	Masks to control forcing the length of specified fields in the returned pattern to match those in the skeleton (when this would not happen otherwise). More...
typedef enum UDateTimePatternConflict	UDateTimePatternConflict
	Status return values from udatpg_addPattern(). More...

Enumerations
enum	UDateTimePatternField {   UDATPG_ERA_FIELD, UDATPG_YEAR_FIELD, UDATPG_QUARTER_FIELD, UDATPG_MONTH_FIELD,   UDATPG_WEEK_OF_YEAR_FIELD, UDATPG_WEEK_OF_MONTH_FIELD, UDATPG_WEEKDAY_FIELD, UDATPG_DAY_OF_YEAR_FIELD,   UDATPG_DAY_OF_WEEK_IN_MONTH_FIELD, UDATPG_DAY_FIELD, UDATPG_DAYPERIOD_FIELD, UDATPG_HOUR_FIELD,   UDATPG_MINUTE_FIELD, UDATPG_SECOND_FIELD, UDATPG_FRACTIONAL_SECOND_FIELD, UDATPG_ZONE_FIELD,   UDATPG_FIELD_COUNT }
	Field number constants for udatpg_getAppendItemFormats() and similar functions. More...
enum	UDateTimePatternMatchOptions {   UDATPG_MATCH_NO_OPTIONS = 0, UDATPG_MATCH_HOUR_FIELD_LENGTH = 1 << UDATPG_HOUR_FIELD, UDATPG_MATCH_MINUTE_FIELD_LENGTH = 1 << UDATPG_MINUTE_FIELD, UDATPG_MATCH_SECOND_FIELD_LENGTH = 1 << UDATPG_SECOND_FIELD,   UDATPG_MATCH_ALL_FIELDS_LENGTH = (1 << UDATPG_FIELD_COUNT) - 1 }
	Masks to control forcing the length of specified fields in the returned pattern to match those in the skeleton (when this would not happen otherwise). More...
enum	UDateTimePatternConflict { UDATPG_NO_CONFLICT, UDATPG_BASE_CONFLICT, UDATPG_CONFLICT, UDATPG_CONFLICT_COUNT }
	Status return values from udatpg_addPattern(). More...

Functions
UDateTimePatternGenerator *	udatpg_open (const char *locale, UErrorCode *pErrorCode)
	Open a generator according to a given locale. More...
UDateTimePatternGenerator *	udatpg_openEmpty (UErrorCode *pErrorCode)
	Open an empty generator, to be constructed with udatpg_addPattern(...) etc. More...
void	udatpg_close (UDateTimePatternGenerator *dtpg)
	Close a generator. More...
UDateTimePatternGenerator *	udatpg_clone (const UDateTimePatternGenerator *dtpg, UErrorCode *pErrorCode)
	Create a copy pf a generator. More...
int32_t	udatpg_getBestPattern (UDateTimePatternGenerator *dtpg, const UChar *skeleton, int32_t length, UChar *bestPattern, int32_t capacity, UErrorCode *pErrorCode)
	Get the best pattern matching the input skeleton. More...
int32_t	udatpg_getBestPatternWithOptions (UDateTimePatternGenerator *dtpg, const UChar *skeleton, int32_t length, UDateTimePatternMatchOptions options, UChar *bestPattern, int32_t capacity, UErrorCode *pErrorCode)
	Get the best pattern matching the input skeleton. More...
int32_t	udatpg_getSkeleton (UDateTimePatternGenerator *dtpg, const UChar *pattern, int32_t length, UChar *skeleton, int32_t capacity, UErrorCode *pErrorCode)
	Get a unique skeleton from a given pattern. More...
int32_t	udatpg_getBaseSkeleton (UDateTimePatternGenerator *dtpg, const UChar *pattern, int32_t length, UChar *baseSkeleton, int32_t capacity, UErrorCode *pErrorCode)
	Get a unique base skeleton from a given pattern. More...
UDateTimePatternConflict	udatpg_addPattern (UDateTimePatternGenerator *dtpg, const UChar *pattern, int32_t patternLength, UBool override, UChar *conflictingPattern, int32_t capacity, int32_t *pLength, UErrorCode *pErrorCode)
	Adds a pattern to the generator. More...
void	udatpg_setAppendItemFormat (UDateTimePatternGenerator *dtpg, UDateTimePatternField field, const UChar *value, int32_t length)
	An AppendItem format is a pattern used to append a field if there is no good match. More...
const UChar *	udatpg_getAppendItemFormat (const UDateTimePatternGenerator *dtpg, UDateTimePatternField field, int32_t *pLength)
	Getter corresponding to setAppendItemFormat. More...
void	udatpg_setAppendItemName (UDateTimePatternGenerator *dtpg, UDateTimePatternField field, const UChar *value, int32_t length)
	Set the name of field, eg "era" in English for ERA. More...
const UChar *	udatpg_getAppendItemName (const UDateTimePatternGenerator *dtpg, UDateTimePatternField field, int32_t *pLength)
	Getter corresponding to setAppendItemNames. More...
void	udatpg_setDateTimeFormat (const UDateTimePatternGenerator *dtpg, const UChar *dtFormat, int32_t length)
	The date time format is a message format pattern used to compose date and time patterns. More...
const UChar *	udatpg_getDateTimeFormat (const UDateTimePatternGenerator *dtpg, int32_t *pLength)
	Getter corresponding to setDateTimeFormat. More...
void	udatpg_setDecimal (UDateTimePatternGenerator *dtpg, const UChar *decimal, int32_t length)
	The decimal value is used in formatting fractions of seconds. More...
const UChar *	udatpg_getDecimal (const UDateTimePatternGenerator *dtpg, int32_t *pLength)
	Getter corresponding to setDecimal. More...
int32_t	udatpg_replaceFieldTypes (UDateTimePatternGenerator *dtpg, const UChar *pattern, int32_t patternLength, const UChar *skeleton, int32_t skeletonLength, UChar *dest, int32_t destCapacity, UErrorCode *pErrorCode)
	Adjusts the field types (width and subtype) of a pattern to match what is in a skeleton. More...
int32_t	udatpg_replaceFieldTypesWithOptions (UDateTimePatternGenerator *dtpg, const UChar *pattern, int32_t patternLength, const UChar *skeleton, int32_t skeletonLength, UDateTimePatternMatchOptions options, UChar *dest, int32_t destCapacity, UErrorCode *pErrorCode)
	Adjusts the field types (width and subtype) of a pattern to match what is in a skeleton. More...
UEnumeration *	udatpg_openSkeletons (const UDateTimePatternGenerator *dtpg, UErrorCode *pErrorCode)
	Return a UEnumeration list of all the skeletons in canonical form. More...
UEnumeration *	udatpg_openBaseSkeletons (const UDateTimePatternGenerator *dtpg, UErrorCode *pErrorCode)
	Return a UEnumeration list of all the base skeletons in canonical form. More...
const UChar *	udatpg_getPatternForSkeleton (const UDateTimePatternGenerator *dtpg, const UChar *skeleton, int32_t skeletonLength, int32_t *pLength)
	Get the pattern corresponding to a given skeleton. More...

Detailed Description

C API: Wrapper for DateTimePatternGenerator (unicode/dtptngen.h).

UDateTimePatternGenerator provides flexible generation of date format patterns, like "yy-MM-dd". The user can build up the generator by adding successive patterns. Once that is done, a query can be made using a "skeleton", which is a pattern which just includes the desired fields and lengths. The generator will return the "best fit" pattern corresponding to that skeleton.

The main method people will use is udatpg_getBestPattern, since normally UDateTimePatternGenerator is pre-built with data from a particular locale. However, generators can be built directly from other data as well.

Issue: may be useful to also have a function that returns the list of fields in a pattern, in order, since we have that internally. That would be useful for getting the UI order of field elements.

Definition in file udatpg.h.

Typedef Documentation

typedef enum UDateTimePatternConflict UDateTimePatternConflict

Status return values from udatpg_addPattern().

Stable:

ICU 3.8

typedef enum UDateTimePatternField UDateTimePatternField

Field number constants for udatpg_getAppendItemFormats() and similar functions.

These constants are separate from UDateFormatField despite semantic overlap because some fields are merged for the date/time pattern generator.

Stable:

ICU 3.8

typedef void* UDateTimePatternGenerator

Opaque type for a date/time pattern generator object.

Stable:

ICU 3.8

Definition at line 45 of file udatpg.h.

typedef enum UDateTimePatternMatchOptions UDateTimePatternMatchOptions

Masks to control forcing the length of specified fields in the returned pattern to match those in the skeleton (when this would not happen otherwise).

These may be combined to force the length of multiple fields. Used with udatpg_getBestPatternWithOptions, udatpg_replaceFieldTypesWithOptions.

Stable:

ICU 4.4

Enumeration Type Documentation

enum UDateTimePatternConflict

Status return values from udatpg_addPattern().

Stable:

ICU 3.8

Enumerator
UDATPG_NO_CONFLICT	Stable: ICU 3.8
UDATPG_BASE_CONFLICT	Stable: ICU 3.8
UDATPG_CONFLICT	Stable: ICU 3.8
UDATPG_CONFLICT_COUNT	Stable: ICU 3.8

Definition at line 114 of file udatpg.h.

enum UDateTimePatternField

Field number constants for udatpg_getAppendItemFormats() and similar functions.

These constants are separate from UDateFormatField despite semantic overlap because some fields are merged for the date/time pattern generator.

Stable:

ICU 3.8

Enumerator
UDATPG_ERA_FIELD	Stable: ICU 3.8
UDATPG_YEAR_FIELD	Stable: ICU 3.8
UDATPG_QUARTER_FIELD	Stable: ICU 3.8
UDATPG_MONTH_FIELD	Stable: ICU 3.8
UDATPG_WEEK_OF_YEAR_FIELD	Stable: ICU 3.8
UDATPG_WEEK_OF_MONTH_FIELD	Stable: ICU 3.8
UDATPG_WEEKDAY_FIELD	Stable: ICU 3.8
UDATPG_DAY_OF_YEAR_FIELD	Stable: ICU 3.8
UDATPG_DAY_OF_WEEK_IN_MONTH_FIELD	Stable: ICU 3.8
UDATPG_DAY_FIELD	Stable: ICU 3.8
UDATPG_DAYPERIOD_FIELD	Stable: ICU 3.8
UDATPG_HOUR_FIELD	Stable: ICU 3.8
UDATPG_MINUTE_FIELD	Stable: ICU 3.8
UDATPG_SECOND_FIELD	Stable: ICU 3.8
UDATPG_FRACTIONAL_SECOND_FIELD	Stable: ICU 3.8
UDATPG_ZONE_FIELD	Stable: ICU 3.8
UDATPG_FIELD_COUNT	Stable: ICU 3.8

Definition at line 53 of file udatpg.h.

enum UDateTimePatternMatchOptions

Masks to control forcing the length of specified fields in the returned pattern to match those in the skeleton (when this would not happen otherwise).

These may be combined to force the length of multiple fields. Used with udatpg_getBestPatternWithOptions, udatpg_replaceFieldTypesWithOptions.

Stable:

ICU 4.4

Enumerator
UDATPG_MATCH_NO_OPTIONS	Stable: ICU 4.4
UDATPG_MATCH_HOUR_FIELD_LENGTH	Stable: ICU 4.4
UDATPG_MATCH_MINUTE_FIELD_LENGTH	Internal: Do not use. This API is for internal use only. ICU 4.4
UDATPG_MATCH_SECOND_FIELD_LENGTH	Internal: Do not use. This API is for internal use only. ICU 4.4
UDATPG_MATCH_ALL_FIELDS_LENGTH	Stable: ICU 4.4

Definition at line 97 of file udatpg.h.

Function Documentation

UDateTimePatternConflict udatpg_addPattern	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	pattern,
		int32_t	patternLength,
		UBool	override,
		UChar *	conflictingPattern,
		int32_t	capacity,
		int32_t *	pLength,
		UErrorCode *	pErrorCode
	)

Adds a pattern to the generator.

If the pattern has the same skeleton as an existing pattern, and the override parameter is set, then the previous value is overriden. Otherwise, the previous value is retained. In either case, the conflicting status is set and previous vale is stored in conflicting pattern.

Note that single-field patterns (like "MMM") are automatically added, and don't need to be added explicitly!

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pattern	input pattern, such as "dd/MMM"
patternLength	the length of pattern.
override	When existing values are to be overridden use true, otherwise use false.
conflictingPattern	Previous pattern with the same skeleton.
capacity	the capacity of conflictingPattern.
pLength	a pointer to the length of conflictingPattern.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

conflicting status. The value could be UDATPG_NO_CONFLICT, UDATPG_BASE_CONFLICT or UDATPG_CONFLICT.

Stable:

ICU 3.8

UDateTimePatternGenerator* udatpg_clone	(	const UDateTimePatternGenerator *	dtpg,
		UErrorCode *	pErrorCode
	)

Create a copy pf a generator.

Parameters

dtpg	a pointer to UDateTimePatternGenerator to be copied.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

a pointer to a new UDateTimePatternGenerator.

Stable:

ICU 3.8

void udatpg_close

(

UDateTimePatternGenerator *

dtpg)

Close a generator.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.

Stable:

ICU 3.8

const UChar* udatpg_getAppendItemFormat	(	const UDateTimePatternGenerator *	dtpg,
		UDateTimePatternField	field,
		int32_t *	pLength
	)

Getter corresponding to setAppendItemFormat.

Values below 0 or at or above UDATPG_FIELD_COUNT are illegal arguments.

Parameters

dtpg	A pointer to UDateTimePatternGenerator.
field	UDateTimePatternField, such as UDATPG_ERA_FIELD
pLength	A pointer that will receive the length of appendItemFormat.

Returns

appendItemFormat for field.

Stable:

ICU 3.8

const UChar* udatpg_getAppendItemName	(	const UDateTimePatternGenerator *	dtpg,
		UDateTimePatternField	field,
		int32_t *	pLength
	)

Getter corresponding to setAppendItemNames.

Values below 0 or at or above UDATPG_FIELD_COUNT are illegal arguments.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
field	UDateTimePatternField, such as UDATPG_ERA_FIELD
pLength	A pointer that will receive the length of the name for field.

Returns

name for field

Stable:

ICU 3.8

int32_t udatpg_getBaseSkeleton	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	pattern,
		int32_t	length,
		UChar *	baseSkeleton,
		int32_t	capacity,
		UErrorCode *	pErrorCode
	)

Get a unique base skeleton from a given pattern.

This is the same as the skeleton, except that differences in length are minimized so as to only preserve the difference between string and numeric form. So for example, both "MMM-dd" and "d/MMM" produce the skeleton "MMMd" (notice the single d).

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pattern	input pattern, such as "dd/MMM".
length	the length of pattern.
baseSkeleton	such as "Md"
capacity	the capacity of base skeleton.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of baseSkeleton.

Stable:

ICU 3.8

int32_t udatpg_getBestPattern	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	skeleton,
		int32_t	length,
		UChar *	bestPattern,
		int32_t	capacity,
		UErrorCode *	pErrorCode
	)

Get the best pattern matching the input skeleton.

It is guaranteed to have all of the fields in the skeleton.

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
skeleton	The skeleton is a pattern containing only the variable fields. For example, "MMMdd" and "mmhh" are skeletons.
length	the length of skeleton
bestPattern	The best pattern found from the given skeleton.
capacity	the capacity of bestPattern.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of bestPattern.

Stable:

ICU 3.8

int32_t udatpg_getBestPatternWithOptions	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	skeleton,
		int32_t	length,
		UDateTimePatternMatchOptions	options,
		UChar *	bestPattern,
		int32_t	capacity,
		UErrorCode *	pErrorCode
	)

Get the best pattern matching the input skeleton.

It is guaranteed to have all of the fields in the skeleton.

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
skeleton	The skeleton is a pattern containing only the variable fields. For example, "MMMdd" and "mmhh" are skeletons.
length	the length of skeleton
options	Options for forcing the length of specified fields in the returned pattern to match those in the skeleton (when this would not happen otherwise). For default behavior, use UDATPG_MATCH_NO_OPTIONS.
bestPattern	The best pattern found from the given skeleton.
capacity	the capacity of bestPattern.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of bestPattern.

Stable:

ICU 4.4

const UChar* udatpg_getDateTimeFormat	(	const UDateTimePatternGenerator *	dtpg,
		int32_t *	pLength
	)

Getter corresponding to setDateTimeFormat.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pLength	A pointer that will receive the length of the format

Returns

dateTimeFormat.

Stable:

ICU 3.8

const UChar* udatpg_getDecimal	(	const UDateTimePatternGenerator *	dtpg,
		int32_t *	pLength
	)

Getter corresponding to setDecimal.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pLength	A pointer that will receive the length of the decimal string.

Returns

corresponding to the decimal point.

Stable:

ICU 3.8

const UChar* udatpg_getPatternForSkeleton	(	const UDateTimePatternGenerator *	dtpg,
		const UChar *	skeleton,
		int32_t	skeletonLength,
		int32_t *	pLength
	)

Get the pattern corresponding to a given skeleton.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
skeleton
skeletonLength	pointer to the length of skeleton.
pLength	pointer to the length of return pattern.

Returns

pattern corresponding to a given skeleton.

Stable:

ICU 3.8

int32_t udatpg_getSkeleton	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	pattern,
		int32_t	length,
		UChar *	skeleton,
		int32_t	capacity,
		UErrorCode *	pErrorCode
	)

Get a unique skeleton from a given pattern.

For example, both "MMM-dd" and "dd/MMM" produce the skeleton "MMMdd".

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pattern	input pattern, such as "dd/MMM".
length	the length of pattern.
skeleton	such as "MMMdd"
capacity	the capacity of skeleton.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of skeleton.

Stable:

ICU 3.8

UDateTimePatternGenerator* udatpg_open	(	const char *	locale,
		UErrorCode *	pErrorCode
	)

Open a generator according to a given locale.

Parameters

locale
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

a pointer to UDateTimePatternGenerator.

Stable:

ICU 3.8

UEnumeration* udatpg_openBaseSkeletons	(	const UDateTimePatternGenerator *	dtpg,
		UErrorCode *	pErrorCode
	)

Return a UEnumeration list of all the base skeletons in canonical form.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

a UEnumeration list of all the base skeletons The caller must close the object.

Stable:

ICU 3.8

UDateTimePatternGenerator* udatpg_openEmpty

(

UErrorCode *

pErrorCode)

Open an empty generator, to be constructed with udatpg_addPattern(...) etc.

Parameters

pErrorCode

a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

a pointer to UDateTimePatternGenerator.

Stable:

ICU 3.8

UEnumeration* udatpg_openSkeletons	(	const UDateTimePatternGenerator *	dtpg,
		UErrorCode *	pErrorCode
	)

Return a UEnumeration list of all the skeletons in canonical form.

Call udatpg_getPatternForSkeleton() to get the corresponding pattern.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call

Returns

a UEnumeration list of all the skeletons The caller must close the object.

Stable:

ICU 3.8

int32_t udatpg_replaceFieldTypes	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	pattern,
		int32_t	patternLength,
		const UChar *	skeleton,
		int32_t	skeletonLength,
		UChar *	dest,
		int32_t	destCapacity,
		UErrorCode *	pErrorCode
	)

Adjusts the field types (width and subtype) of a pattern to match what is in a skeleton.

That is, if you supply a pattern like "d-M H:m", and a skeleton of "MMMMddhhmm", then the input pattern is adjusted to be "dd-MMMM hh:mm". This is used internally to get the best match for the input skeleton, but can also be used externally.

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pattern	Input pattern
patternLength	the length of input pattern.
skeleton
skeletonLength	the length of input skeleton.
dest	pattern adjusted to match the skeleton fields widths and subtypes.
destCapacity	the capacity of dest.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of dest.

Stable:

ICU 3.8

int32_t udatpg_replaceFieldTypesWithOptions	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	pattern,
		int32_t	patternLength,
		const UChar *	skeleton,
		int32_t	skeletonLength,
		UDateTimePatternMatchOptions	options,
		UChar *	dest,
		int32_t	destCapacity,
		UErrorCode *	pErrorCode
	)

Adjusts the field types (width and subtype) of a pattern to match what is in a skeleton.

That is, if you supply a pattern like "d-M H:m", and a skeleton of "MMMMddhhmm", then the input pattern is adjusted to be "dd-MMMM hh:mm". This is used internally to get the best match for the input skeleton, but can also be used externally.

Note that this function uses a non-const UDateTimePatternGenerator: It uses a stateful pattern parser which is set up for each generator object, rather than creating one for each function call. Consecutive calls to this function do not affect each other, but this function cannot be used concurrently on a single generator object.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
pattern	Input pattern
patternLength	the length of input pattern.
skeleton
skeletonLength	the length of input skeleton.
options	Options controlling whether the length of specified fields in the pattern are adjusted to match those in the skeleton (when this would not happen otherwise). For default behavior, use UDATPG_MATCH_NO_OPTIONS.
dest	pattern adjusted to match the skeleton fields widths and subtypes.
destCapacity	the capacity of dest.
pErrorCode	a pointer to the UErrorCode which must not indicate a failure before the function call.

Returns

the length of dest.

Stable:

ICU 4.4

void udatpg_setAppendItemFormat	(	UDateTimePatternGenerator *	dtpg,
		UDateTimePatternField	field,
		const UChar *	value,
		int32_t	length
	)

An AppendItem format is a pattern used to append a field if there is no good match.

For example, suppose that the input skeleton is "GyyyyMMMd", and there is no matching pattern internally, but there is a pattern matching "yyyyMMMd", say "d-MM-yyyy". Then that pattern is used, plus the G. The way these two are conjoined is by using the AppendItemFormat for G (era). So if that value is, say "{0}, {1}" then the final resulting pattern is "d-MM-yyyy, G".

There are actually three available variables: {0} is the pattern so far, {1} is the element we are adding, and {2} is the name of the element.

This reflects the way that the CLDR data is organized.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
field	UDateTimePatternField, such as UDATPG_ERA_FIELD
value	pattern, such as "{0}, {1}"
length	the length of value.

Stable:

ICU 3.8

void udatpg_setAppendItemName	(	UDateTimePatternGenerator *	dtpg,
		UDateTimePatternField	field,
		const UChar *	value,
		int32_t	length
	)

Set the name of field, eg "era" in English for ERA.

These are only used if the corresponding AppendItemFormat is used, and if it contains a {2} variable.

This reflects the way that the CLDR data is organized.

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
field	UDateTimePatternField
value	name for the field.
length	the length of value.

Stable:

ICU 3.8

void udatpg_setDateTimeFormat	(	const UDateTimePatternGenerator *	dtpg,
		const UChar *	dtFormat,
		int32_t	length
	)

The date time format is a message format pattern used to compose date and time patterns.

The default value is "{0} {1}", where {0} will be replaced by the date pattern and {1} will be replaced by the time pattern.

This is used when the input skeleton contains both date and time fields, but there is not a close match among the added patterns. For example, suppose that this object was created by adding "dd-MMM" and "hh:mm", and its datetimeFormat is the default "{0} {1}". Then if the input skeleton is "MMMdhmm", there is not an exact match, so the input skeleton is broken up into two components "MMMd" and "hmm". There are close matches for those two skeletons, so the result is put together with this pattern, resulting in "d-MMM h:mm".

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
dtFormat	message format pattern, here {0} will be replaced by the date pattern and {1} will be replaced by the time pattern.
length	the length of dtFormat.

Stable:

ICU 3.8

void udatpg_setDecimal	(	UDateTimePatternGenerator *	dtpg,
		const UChar *	decimal,
		int32_t	length
	)

The decimal value is used in formatting fractions of seconds.

If the skeleton contains fractional seconds, then this is used with the fractional seconds. For example, suppose that the input pattern is "hhmmssSSSS", and the best matching pattern internally is "H:mm:ss", and the decimal string is ",". Then the resulting pattern is modified to be "H:mm:ss,SSSS"

Parameters

dtpg	a pointer to UDateTimePatternGenerator.
decimal
length	the length of decimal.

Stable:

ICU 3.8