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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+* Copyright (C) 2007-2015, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+*******************************************************************************
+* file name: udatpg.h
+* encoding: US-ASCII
+* tab size: 8 (not used)
+* indentation:4
+*
+* created on: 2007jul30
+* created by: Markus W. Scherer
+*/
+
+#ifndef __UDATPG_H__
+#define __UDATPG_H__
+
+#include "unicode/utypes.h"
+#include "unicode/uenum.h"
+#include "unicode/localpointer.h"
+
+/**
+ * \file
+ * \brief C API: Wrapper for icu::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.
+ * <p>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.
+ * <p><i>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.</i>
+ */
+
+/**
+ * Opaque type for a date/time pattern generator object.
+ * @stable ICU 3.8
+ */
+typedef void *UDateTimePatternGenerator;
+
+/**
+ * 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 enum UDateTimePatternField {
+ /** @stable ICU 3.8 */
+ 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,
+
+ // Do not conditionalize the following with #ifndef U_HIDE_DEPRECATED_API,
+ // it is needed for layout of DateTimePatternGenerator object.
+ /**
+ * One more than the highest normal UDateTimePatternField value.
+ * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+ */
+ UDATPG_FIELD_COUNT
+} UDateTimePatternField;
+
+/**
+ * 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
+ */
+typedef enum UDateTimePatternMatchOptions {
+ /** @stable ICU 4.4 */
+ UDATPG_MATCH_NO_OPTIONS = 0,
+ /** @stable ICU 4.4 */
+ UDATPG_MATCH_HOUR_FIELD_LENGTH = 1 << UDATPG_HOUR_FIELD,
+#ifndef U_HIDE_INTERNAL_API
+ /** @internal ICU 4.4 */
+ UDATPG_MATCH_MINUTE_FIELD_LENGTH = 1 << UDATPG_MINUTE_FIELD,
+ /** @internal ICU 4.4 */
+ UDATPG_MATCH_SECOND_FIELD_LENGTH = 1 << UDATPG_SECOND_FIELD,
+#endif /* U_HIDE_INTERNAL_API */
+ /** @stable ICU 4.4 */
+ UDATPG_MATCH_ALL_FIELDS_LENGTH = (1 << UDATPG_FIELD_COUNT) - 1
+} UDateTimePatternMatchOptions;
+
+/**
+ * Status return values from udatpg_addPattern().
+ * @stable ICU 3.8
+ */
+typedef enum UDateTimePatternConflict {
+ /** @stable ICU 3.8 */
+ UDATPG_NO_CONFLICT,
+ /** @stable ICU 3.8 */
+ UDATPG_BASE_CONFLICT,
+ /** @stable ICU 3.8 */
+ UDATPG_CONFLICT,
+#ifndef U_HIDE_DEPRECATED_API
+ /**
+ * One more than the highest normal UDateTimePatternConflict value.
+ * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+ */
+ UDATPG_CONFLICT_COUNT
+#endif // U_HIDE_DEPRECATED_API
+} UDateTimePatternConflict;
+
+/**
+ * Open a generator according to a given locale.
+ * @param locale
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return a pointer to UDateTimePatternGenerator.
+ * @stable ICU 3.8
+ */
+U_STABLE UDateTimePatternGenerator * U_EXPORT2
+udatpg_open(const char *locale, UErrorCode *pErrorCode);
+
+/**
+ * Open an empty generator, to be constructed with udatpg_addPattern(...) etc.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return a pointer to UDateTimePatternGenerator.
+ * @stable ICU 3.8
+ */
+U_STABLE UDateTimePatternGenerator * U_EXPORT2
+udatpg_openEmpty(UErrorCode *pErrorCode);
+
+/**
+ * Close a generator.
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @stable ICU 3.8
+ */
+U_STABLE void U_EXPORT2
+udatpg_close(UDateTimePatternGenerator *dtpg);
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalUDateTimePatternGeneratorPointer
+ * "Smart pointer" class, closes a UDateTimePatternGenerator via udatpg_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @stable ICU 4.4
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalUDateTimePatternGeneratorPointer, UDateTimePatternGenerator, udatpg_close);
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Create a copy pf a generator.
+ * @param dtpg a pointer to UDateTimePatternGenerator to be copied.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return a pointer to a new UDateTimePatternGenerator.
+ * @stable ICU 3.8
+ */
+U_STABLE UDateTimePatternGenerator * U_EXPORT2
+udatpg_clone(const UDateTimePatternGenerator *dtpg, 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.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param skeleton
+ * The skeleton is a pattern containing only the variable fields.
+ * For example, "MMMdd" and "mmhh" are skeletons.
+ * @param length the length of skeleton
+ * @param bestPattern
+ * The best pattern found from the given skeleton.
+ * @param capacity the capacity of bestPattern.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of bestPattern.
+ * @stable ICU 3.8
+ */
+U_STABLE int32_t U_EXPORT2
+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.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param skeleton
+ * The skeleton is a pattern containing only the variable fields.
+ * For example, "MMMdd" and "mmhh" are skeletons.
+ * @param length the length of skeleton
+ * @param 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.
+ * @param bestPattern
+ * The best pattern found from the given skeleton.
+ * @param capacity
+ * the capacity of bestPattern.
+ * @param pErrorCode
+ * a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of bestPattern.
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+udatpg_getBestPatternWithOptions(UDateTimePatternGenerator *dtpg,
+ const UChar *skeleton, int32_t length,
+ UDateTimePatternMatchOptions options,
+ UChar *bestPattern, 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.
+ *
+ * @param unusedDtpg a pointer to UDateTimePatternGenerator.
+ * This parameter is no longer used. Callers may pass NULL.
+ * @param pattern input pattern, such as "dd/MMM".
+ * @param length the length of pattern.
+ * @param skeleton such as "MMMdd"
+ * @param capacity the capacity of skeleton.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of skeleton.
+ * @stable ICU 3.8
+ */
+U_STABLE int32_t U_EXPORT2
+udatpg_getSkeleton(UDateTimePatternGenerator *unusedDtpg,
+ const UChar *pattern, int32_t length,
+ UChar *skeleton, 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.
+ *
+ * @param unusedDtpg a pointer to UDateTimePatternGenerator.
+ * This parameter is no longer used. Callers may pass NULL.
+ * @param pattern input pattern, such as "dd/MMM".
+ * @param length the length of pattern.
+ * @param baseSkeleton such as "Md"
+ * @param capacity the capacity of base skeleton.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of baseSkeleton.
+ * @stable ICU 3.8
+ */
+U_STABLE int32_t U_EXPORT2
+udatpg_getBaseSkeleton(UDateTimePatternGenerator *unusedDtpg,
+ const UChar *pattern, int32_t length,
+ UChar *baseSkeleton, int32_t capacity,
+ 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.
+ * <p>
+ * Note that single-field patterns (like "MMM") are automatically added, and
+ * don't need to be added explicitly!
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pattern input pattern, such as "dd/MMM"
+ * @param patternLength the length of pattern.
+ * @param override When existing values are to be overridden use true,
+ * otherwise use false.
+ * @param conflictingPattern Previous pattern with the same skeleton.
+ * @param capacity the capacity of conflictingPattern.
+ * @param pLength a pointer to the length of conflictingPattern.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return conflicting status. The value could be UDATPG_NO_CONFLICT,
+ * UDATPG_BASE_CONFLICT or UDATPG_CONFLICT.
+ * @stable ICU 3.8
+ */
+U_STABLE UDateTimePatternConflict U_EXPORT2
+udatpg_addPattern(UDateTimePatternGenerator *dtpg,
+ const UChar *pattern, int32_t patternLength,
+ UBool override,
+ UChar *conflictingPattern, int32_t capacity, int32_t *pLength,
+ UErrorCode *pErrorCode);
+
+/**
+ * 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".
+ * <p>
+ * 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.
+ * <p>
+ * This reflects the way that the CLDR data is organized.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param field UDateTimePatternField, such as UDATPG_ERA_FIELD
+ * @param value pattern, such as "{0}, {1}"
+ * @param length the length of value.
+ * @stable ICU 3.8
+ */
+U_STABLE void U_EXPORT2
+udatpg_setAppendItemFormat(UDateTimePatternGenerator *dtpg,
+ UDateTimePatternField field,
+ const UChar *value, int32_t length);
+
+/**
+ * Getter corresponding to setAppendItemFormat. Values below 0 or at or
+ * above UDATPG_FIELD_COUNT are illegal arguments.
+ *
+ * @param dtpg A pointer to UDateTimePatternGenerator.
+ * @param field UDateTimePatternField, such as UDATPG_ERA_FIELD
+ * @param pLength A pointer that will receive the length of appendItemFormat.
+ * @return appendItemFormat for field.
+ * @stable ICU 3.8
+ */
+U_STABLE const UChar * U_EXPORT2
+udatpg_getAppendItemFormat(const UDateTimePatternGenerator *dtpg,
+ UDateTimePatternField field,
+ int32_t *pLength);
+
+/**
+ * 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.
+ * <p>
+ * This reflects the way that the CLDR data is organized.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param field UDateTimePatternField
+ * @param value name for the field.
+ * @param length the length of value.
+ * @stable ICU 3.8
+ */
+U_STABLE void U_EXPORT2
+udatpg_setAppendItemName(UDateTimePatternGenerator *dtpg,
+ UDateTimePatternField field,
+ const UChar *value, int32_t length);
+
+/**
+ * Getter corresponding to setAppendItemNames. Values below 0 or at or above
+ * UDATPG_FIELD_COUNT are illegal arguments.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param field UDateTimePatternField, such as UDATPG_ERA_FIELD
+ * @param pLength A pointer that will receive the length of the name for field.
+ * @return name for field
+ * @stable ICU 3.8
+ */
+U_STABLE const UChar * U_EXPORT2
+udatpg_getAppendItemName(const UDateTimePatternGenerator *dtpg,
+ UDateTimePatternField field,
+ int32_t *pLength);
+
+/**
+ * The DateTimeFormat is a message format pattern used to compose date and
+ * time patterns. The default pattern in the root locale is "{1} {0}", where
+ * {1} will be replaced by the date pattern and {0} will be replaced by the
+ * time pattern; however, other locales may specify patterns such as
+ * "{1}, {0}" or "{1} 'at' {0}", etc.
+ * <p>
+ * 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 "{1} {0}". 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".
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param dtFormat
+ * message format pattern, here {1} will be replaced by the date
+ * pattern and {0} will be replaced by the time pattern.
+ * @param length the length of dtFormat.
+ * @stable ICU 3.8
+ */
+U_STABLE void U_EXPORT2
+udatpg_setDateTimeFormat(const UDateTimePatternGenerator *dtpg,
+ const UChar *dtFormat, int32_t length);
+
+/**
+ * Getter corresponding to setDateTimeFormat.
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pLength A pointer that will receive the length of the format
+ * @return dateTimeFormat.
+ * @stable ICU 3.8
+ */
+U_STABLE const UChar * U_EXPORT2
+udatpg_getDateTimeFormat(const UDateTimePatternGenerator *dtpg,
+ int32_t *pLength);
+
+/**
+ * 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"
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param decimal
+ * @param length the length of decimal.
+ * @stable ICU 3.8
+ */
+U_STABLE void U_EXPORT2
+udatpg_setDecimal(UDateTimePatternGenerator *dtpg,
+ const UChar *decimal, int32_t length);
+
+/**
+ * Getter corresponding to setDecimal.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pLength A pointer that will receive the length of the decimal string.
+ * @return corresponding to the decimal point.
+ * @stable ICU 3.8
+ */
+U_STABLE const UChar * U_EXPORT2
+udatpg_getDecimal(const UDateTimePatternGenerator *dtpg,
+ int32_t *pLength);
+
+/**
+ * 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.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pattern Input pattern
+ * @param patternLength the length of input pattern.
+ * @param skeleton
+ * @param skeletonLength the length of input skeleton.
+ * @param dest pattern adjusted to match the skeleton fields widths and subtypes.
+ * @param destCapacity the capacity of dest.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of dest.
+ * @stable ICU 3.8
+ */
+U_STABLE int32_t U_EXPORT2
+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.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pattern Input pattern
+ * @param patternLength the length of input pattern.
+ * @param skeleton
+ * @param skeletonLength the length of input skeleton.
+ * @param 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.
+ * @param dest pattern adjusted to match the skeleton fields widths and subtypes.
+ * @param destCapacity the capacity of dest.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return the length of dest.
+ * @stable ICU 4.4
+ */
+U_STABLE int32_t U_EXPORT2
+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);
+
+/**
+ * Return a UEnumeration list of all the skeletons in canonical form.
+ * Call udatpg_getPatternForSkeleton() to get the corresponding pattern.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call
+ * @return a UEnumeration list of all the skeletons
+ * The caller must close the object.
+ * @stable ICU 3.8
+ */
+U_STABLE UEnumeration * U_EXPORT2
+udatpg_openSkeletons(const UDateTimePatternGenerator *dtpg, UErrorCode *pErrorCode);
+
+/**
+ * Return a UEnumeration list of all the base skeletons in canonical form.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param pErrorCode a pointer to the UErrorCode which must not indicate a
+ * failure before the function call.
+ * @return a UEnumeration list of all the base skeletons
+ * The caller must close the object.
+ * @stable ICU 3.8
+ */
+U_STABLE UEnumeration * U_EXPORT2
+udatpg_openBaseSkeletons(const UDateTimePatternGenerator *dtpg, UErrorCode *pErrorCode);
+
+/**
+ * Get the pattern corresponding to a given skeleton.
+ *
+ * @param dtpg a pointer to UDateTimePatternGenerator.
+ * @param skeleton
+ * @param skeletonLength pointer to the length of skeleton.
+ * @param pLength pointer to the length of return pattern.
+ * @return pattern corresponding to a given skeleton.
+ * @stable ICU 3.8
+ */
+U_STABLE const UChar * U_EXPORT2
+udatpg_getPatternForSkeleton(const UDateTimePatternGenerator *dtpg,
+ const UChar *skeleton, int32_t skeletonLength,
+ int32_t *pLength);
+
+#endif