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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2008-2016, International Business Machines Corporation and
6 * others. All Rights Reserved.
7 *******************************************************************************
8 *
9 * File DTITVINF.H
10 *
11 *******************************************************************************
12 */
13
14 #ifndef __DTITVINF_H__
15 #define __DTITVINF_H__
16
17 #include "unicode/utypes.h"
18
19 #if U_SHOW_CPLUSPLUS_API
20
21 /**
22 * \file
23 * \brief C++ API: Date/Time interval patterns for formatting date/time interval
24 */
25
26 #if !UCONFIG_NO_FORMATTING
27
28 #include "unicode/udat.h"
29 #include "unicode/locid.h"
30 #include "unicode/ucal.h"
31 #include "unicode/dtptngen.h"
32
33 U_NAMESPACE_BEGIN
34
35 /**
36 * DateIntervalInfo is a public class for encapsulating localizable
37 * date time interval patterns. It is used by DateIntervalFormat.
38 *
39 * <P>
40 * For most users, ordinary use of DateIntervalFormat does not need to create
41 * DateIntervalInfo object directly.
42 * DateIntervalFormat will take care of it when creating a date interval
43 * formatter when user pass in skeleton and locale.
44 *
45 * <P>
46 * For power users, who want to create their own date interval patterns,
47 * or want to re-set date interval patterns, they could do so by
48 * directly creating DateIntervalInfo and manupulating it.
49 *
50 * <P>
51 * Logically, the interval patterns are mappings
52 * from (skeleton, the_largest_different_calendar_field)
53 * to (date_interval_pattern).
54 *
55 * <P>
56 * A skeleton
57 * <ol>
58 * <li>
59 * only keeps the field pattern letter and ignores all other parts
60 * in a pattern, such as space, punctuations, and string literals.
61 * <li>
62 * hides the order of fields.
63 * <li>
64 * might hide a field's pattern letter length.
65 *
66 * For those non-digit calendar fields, the pattern letter length is
67 * important, such as MMM, MMMM, and MMMMM; EEE and EEEE,
68 * and the field's pattern letter length is honored.
69 *
70 * For the digit calendar fields, such as M or MM, d or dd, yy or yyyy,
71 * the field pattern length is ignored and the best match, which is defined
72 * in date time patterns, will be returned without honor the field pattern
73 * letter length in skeleton.
74 * </ol>
75 *
76 * <P>
77 * The calendar fields we support for interval formatting are:
78 * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
79 * Those calendar fields can be defined in the following order:
80 * year > month > date > am-pm > hour > minute
81 *
82 * The largest different calendar fields between 2 calendars is the
83 * first different calendar field in above order.
84 *
85 * For example: the largest different calendar fields between &quot;Jan 10, 2007&quot;
86 * and &quot;Feb 20, 2008&quot; is year.
87 *
88 * <P>
89 * There is a set of pre-defined static skeleton strings.
90 * There are pre-defined interval patterns for those pre-defined skeletons
91 * in locales' resource files.
92 * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is &quot;yMMMd&quot;,
93 * in en_US, if the largest different calendar field between date1 and date2
94 * is &quot;year&quot;, the date interval pattern is &quot;MMM d, yyyy - MMM d, yyyy&quot;,
95 * such as &quot;Jan 10, 2007 - Jan 10, 2008&quot;.
96 * If the largest different calendar field between date1 and date2 is &quot;month&quot;,
97 * the date interval pattern is &quot;MMM d - MMM d, yyyy&quot;,
98 * such as &quot;Jan 10 - Feb 10, 2007&quot;.
99 * If the largest different calendar field between date1 and date2 is &quot;day&quot;,
100 * the date interval pattern is &quot;MMM d-d, yyyy&quot;, such as &quot;Jan 10-20, 2007&quot;.
101 *
102 * For date skeleton, the interval patterns when year, or month, or date is
103 * different are defined in resource files.
104 * For time skeleton, the interval patterns when am/pm, or hour, or minute is
105 * different are defined in resource files.
106 *
107 *
108 * <P>
109 * There are 2 dates in interval pattern. For most locales, the first date
110 * in an interval pattern is the earlier date. There might be a locale in which
111 * the first date in an interval pattern is the later date.
112 * We use fallback format for the default order for the locale.
113 * For example, if the fallback format is &quot;{0} - {1}&quot;, it means
114 * the first date in the interval pattern for this locale is earlier date.
115 * If the fallback format is &quot;{1} - {0}&quot;, it means the first date is the
116 * later date.
117 * For a particular interval pattern, the default order can be overriden
118 * by prefixing &quot;latestFirst:&quot; or &quot;earliestFirst:&quot; to the interval pattern.
119 * For example, if the fallback format is &quot;{0}-{1}&quot;,
120 * but for skeleton &quot;yMMMd&quot;, the interval pattern when day is different is
121 * &quot;latestFirst:d-d MMM yy&quot;, it means by default, the first date in interval
122 * pattern is the earlier date. But for skeleton &quot;yMMMd&quot;, when day is different,
123 * the first date in &quot;d-d MMM yy&quot; is the later date.
124 *
125 * <P>
126 * The recommended way to create a DateIntervalFormat object is to pass in
127 * the locale.
128 * By using a Locale parameter, the DateIntervalFormat object is
129 * initialized with the pre-defined interval patterns for a given or
130 * default locale.
131 * <P>
132 * Users can also create DateIntervalFormat object
133 * by supplying their own interval patterns.
134 * It provides flexibility for power users.
135 *
136 * <P>
137 * After a DateIntervalInfo object is created, clients may modify
138 * the interval patterns using setIntervalPattern function as so desired.
139 * Currently, users can only set interval patterns when the following
140 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
141 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND.
142 * Interval patterns when other calendar fields are different is not supported.
143 * <P>
144 * DateIntervalInfo objects are cloneable.
145 * When clients obtain a DateIntervalInfo object,
146 * they can feel free to modify it as necessary.
147 * <P>
148 * DateIntervalInfo are not expected to be subclassed.
149 * Data for a calendar is loaded out of resource bundles.
150 * Through ICU 4.4, date interval patterns are only supported in the Gregorian
151 * calendar; non-Gregorian calendars are supported from ICU 4.4.1.
152 * @stable ICU 4.0
153 **/
154 class U_I18N_API DateIntervalInfo U_FINAL : public UObject {
155 public:
156 /**
157 * Default constructor.
158 * It does not initialize any interval patterns except
159 * that it initialize default fall-back pattern as "{0} - {1}",
160 * which can be reset by setFallbackIntervalPattern().
161 * It should be followed by setFallbackIntervalPattern() and
162 * setIntervalPattern(),
163 * and is recommended to be used only for power users who
164 * wants to create their own interval patterns and use them to create
165 * date interval formatter.
166 * @param status output param set to success/failure code on exit
167 * @internal ICU 4.0
168 */
169 DateIntervalInfo(UErrorCode& status);
170
171
172 /**
173 * Construct DateIntervalInfo for the given locale,
174 * @param locale the interval patterns are loaded from the appropriate calendar
175 * data (specified calendar or default calendar) in this locale.
176 * @param status output param set to success/failure code on exit
177 * @stable ICU 4.0
178 */
179 DateIntervalInfo(const Locale& locale, UErrorCode& status);
180
181
182 /**
183 * Copy constructor.
184 * @stable ICU 4.0
185 */
186 DateIntervalInfo(const DateIntervalInfo&);
187
188 /**
189 * Assignment operator
190 * @stable ICU 4.0
191 */
192 DateIntervalInfo& operator=(const DateIntervalInfo&);
193
194 /**
195 * Clone this object polymorphically.
196 * The caller owns the result and should delete it when done.
197 * @return a copy of the object
198 * @stable ICU 4.0
199 */
200 virtual DateIntervalInfo* clone() const;
201
202 /**
203 * Destructor.
204 * It is virtual to be safe, but it is not designed to be subclassed.
205 * @stable ICU 4.0
206 */
207 virtual ~DateIntervalInfo();
208
209
210 /**
211 * Return true if another object is semantically equal to this one.
212 *
213 * @param other the DateIntervalInfo object to be compared with.
214 * @return true if other is semantically equal to this.
215 * @stable ICU 4.0
216 */
217 virtual UBool operator==(const DateIntervalInfo& other) const;
218
219 /**
220 * Return true if another object is semantically unequal to this one.
221 *
222 * @param other the DateIntervalInfo object to be compared with.
223 * @return true if other is semantically unequal to this.
224 * @stable ICU 4.0
225 */
226 UBool operator!=(const DateIntervalInfo& other) const;
227
228
229
230 /**
231 * Provides a way for client to build interval patterns.
232 * User could construct DateIntervalInfo by providing a list of skeletons
233 * and their patterns.
234 * <P>
235 * For example:
236 * <pre>
237 * UErrorCode status = U_ZERO_ERROR;
238 * DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
239 * dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}");
240 * dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status);
241 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status);
242 * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status);
243 * </pre>
244 *
245 * Restriction:
246 * Currently, users can only set interval patterns when the following
247 * calendar fields are different: ERA, YEAR, MONTH, DATE, DAY_OF_MONTH,
248 * DAY_OF_WEEK, AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND and MILLISECOND.
249 * Interval patterns when other calendar fields are different are
250 * not supported.
251 *
252 * @param skeleton the skeleton on which interval pattern based
253 * @param lrgDiffCalUnit the largest different calendar unit.
254 * @param intervalPattern the interval pattern on the largest different
255 * calendar unit.
256 * For example, if lrgDiffCalUnit is
257 * "year", the interval pattern for en_US when year
258 * is different could be "'from' yyyy 'to' yyyy".
259 * @param status output param set to success/failure code on exit
260 * @stable ICU 4.0
261 */
262 void setIntervalPattern(const UnicodeString& skeleton,
263 UCalendarDateFields lrgDiffCalUnit,
264 const UnicodeString& intervalPattern,
265 UErrorCode& status);
266
267 /**
268 * Get the interval pattern given skeleton and
269 * the largest different calendar field.
270 * @param skeleton the skeleton
271 * @param field the largest different calendar field
272 * @param result output param to receive the pattern
273 * @param status output param set to success/failure code on exit
274 * @return a reference to 'result'
275 * @stable ICU 4.0
276 */
277 UnicodeString& getIntervalPattern(const UnicodeString& skeleton,
278 UCalendarDateFields field,
279 UnicodeString& result,
280 UErrorCode& status) const;
281
282 /**
283 * Get the fallback interval pattern.
284 * @param result output param to receive the pattern
285 * @return a reference to 'result'
286 * @stable ICU 4.0
287 */
288 UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const;
289
290
291 /**
292 * Re-set the fallback interval pattern.
293 *
294 * In construction, default fallback pattern is set as "{0} - {1}".
295 * And constructor taking locale as parameter will set the
296 * fallback pattern as what defined in the locale resource file.
297 *
298 * This method provides a way for user to replace the fallback pattern.
299 *
300 * @param fallbackPattern fall-back interval pattern.
301 * @param status output param set to success/failure code on exit
302 * @stable ICU 4.0
303 */
304 void setFallbackIntervalPattern(const UnicodeString& fallbackPattern,
305 UErrorCode& status);
306
307
308 /** Get default order -- whether the first date in pattern is later date
309 or not.
310 * return default date ordering in interval pattern. TRUE if the first date
311 * in pattern is later date, FALSE otherwise.
312 * @stable ICU 4.0
313 */
314 UBool getDefaultOrder() const;
315
316
317 /**
318 * ICU "poor man's RTTI", returns a UClassID for the actual class.
319 *
320 * @stable ICU 4.0
321 */
322 virtual UClassID getDynamicClassID() const;
323
324 /**
325 * ICU "poor man's RTTI", returns a UClassID for this class.
326 *
327 * @stable ICU 4.0
328 */
329 static UClassID U_EXPORT2 getStaticClassID();
330
331
332 private:
333 /**
334 * DateIntervalFormat will need access to
335 * getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex,
336 * and calendarFieldToPatternIndex().
337 *
338 * Instead of making above public,
339 * make DateIntervalFormat a friend of DateIntervalInfo.
340 */
341 friend class DateIntervalFormat;
342
343 /**
344 * Internal struct used to load resource bundle data.
345 */
346 struct DateIntervalSink;
347
348 /**
349 * Following is for saving the interval patterns.
350 * We only support interval patterns on
351 * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, MINUTE, SECOND and MILLISECOND.
352 */
353 enum IntervalPatternIndex
354 {
355 kIPI_ERA,
356 kIPI_YEAR,
357 kIPI_MONTH,
358 kIPI_DATE,
359 kIPI_AM_PM,
360 kIPI_HOUR,
361 kIPI_MINUTE,
362 kIPI_SECOND,
363 kIPI_MILLISECOND,
364 kIPI_MAX_INDEX
365 };
366 public:
367 #ifndef U_HIDE_INTERNAL_API
368 /**
369 * Max index for stored interval patterns
370 * @internal ICU 4.4
371 */
372 enum {
373 kMaxIntervalPatternIndex = kIPI_MAX_INDEX
374 };
375 #endif /* U_HIDE_INTERNAL_API */
376 private:
377
378
379 /**
380 * Initialize the DateIntervalInfo from locale
381 * @param locale the given locale.
382 * @param status output param set to success/failure code on exit
383 */
384 void initializeData(const Locale& locale, UErrorCode& status);
385
386
387 /* Set Interval pattern.
388 *
389 * It sets interval pattern into the hash map.
390 *
391 * @param skeleton skeleton on which the interval pattern based
392 * @param lrgDiffCalUnit the largest different calendar unit.
393 * @param intervalPattern the interval pattern on the largest different
394 * calendar unit.
395 * @param status output param set to success/failure code on exit
396 */
397 void setIntervalPatternInternally(const UnicodeString& skeleton,
398 UCalendarDateFields lrgDiffCalUnit,
399 const UnicodeString& intervalPattern,
400 UErrorCode& status);
401
402
403 /**given an input skeleton, get the best match skeleton
404 * which has pre-defined interval pattern in resource file.
405 * Also return the difference between the input skeleton
406 * and the best match skeleton.
407 *
408 * TODO (xji): set field weight or
409 * isolate the funtionality in DateTimePatternGenerator
410 * @param skeleton input skeleton
411 * @param bestMatchDistanceInfo the difference between input skeleton
412 * and best match skeleton.
413 * 0, if there is exact match for input skeleton
414 * 1, if there is only field width difference between
415 * the best match and the input skeleton
416 * 2, the only field difference is 'v' and 'z'
417 * -1, if there is calendar field difference between
418 * the best match and the input skeleton
419 * @return best match skeleton
420 */
421 const UnicodeString* getBestSkeleton(const UnicodeString& skeleton,
422 int8_t& bestMatchDistanceInfo) const;
423
424
425 /**
426 * Parse skeleton, save each field's width.
427 * It is used for looking for best match skeleton,
428 * and adjust pattern field width.
429 * @param skeleton skeleton to be parsed
430 * @param skeletonFieldWidth parsed skeleton field width
431 */
432 static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton,
433 int32_t* skeletonFieldWidth);
434
435
436 /**
437 * Check whether one field width is numeric while the other is string.
438 *
439 * TODO (xji): make it general
440 *
441 * @param fieldWidth one field width
442 * @param anotherFieldWidth another field width
443 * @param patternLetter pattern letter char
444 * @return true if one field width is numeric and the other is string,
445 * false otherwise.
446 */
447 static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth,
448 int32_t anotherFieldWidth,
449 char patternLetter);
450
451
452 /**
453 * Convert calendar field to the interval pattern index in
454 * hash table.
455 *
456 * Since we only support the following calendar fields:
457 * ERA, YEAR, MONTH, DATE, DAY_OF_MONTH, DAY_OF_WEEK,
458 * AM_PM, HOUR, HOUR_OF_DAY, MINUTE, SECOND, and MILLISECOND.
459 * We reserve only 4 interval patterns for a skeleton.
460 *
461 * @param field calendar field
462 * @param status output param set to success/failure code on exit
463 * @return interval pattern index in hash table
464 */
465 static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex(
466 UCalendarDateFields field,
467 UErrorCode& status);
468
469
470 /**
471 * delete hash table (of type fIntervalPatterns).
472 *
473 * @param hTable hash table to be deleted
474 */
475 void deleteHash(Hashtable* hTable);
476
477
478 /**
479 * initialize hash table (of type fIntervalPatterns).
480 *
481 * @param status output param set to success/failure code on exit
482 * @return hash table initialized
483 */
484 Hashtable* initHash(UErrorCode& status);
485
486
487
488 /**
489 * copy hash table (of type fIntervalPatterns).
490 *
491 * @param source the source to copy from
492 * @param target the target to copy to
493 * @param status output param set to success/failure code on exit
494 */
495 void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status);
496
497
498 // data members
499 // fallback interval pattern
500 UnicodeString fFallbackIntervalPattern;
501 // default order
502 UBool fFirstDateInPtnIsLaterDate;
503
504 // HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]>
505 // HashMap( skeleton, pattern[largest_different_field] )
506 Hashtable* fIntervalPatterns;
507
508 };// end class DateIntervalInfo
509
510
511 inline UBool
512 DateIntervalInfo::operator!=(const DateIntervalInfo& other) const {
513 return !operator==(other);
514 }
515
516
517 U_NAMESPACE_END
518
519 #endif
520
521 #endif /* U_SHOW_CPLUSPLUS_API */
522
523 #endif
524