DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d38398e5144e)

VCS Links

DateIntervalInfo

IntervalPatternIndex

Macros

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *******************************************************************************
 * Copyright (C) 2008-2016, International Business Machines Corporation and
 * others. All Rights Reserved.
 *******************************************************************************
 *
 * File DTITVINF.H
 *
 *******************************************************************************
 */

#ifndef __DTITVINF_H__
#define __DTITVINF_H__

#include "unicode/utypes.h"

/**
 * \file
 * \brief C++ API: Date/Time interval patterns for formatting date/time interval
 */

#if !UCONFIG_NO_FORMATTING

#include "unicode/udat.h"
#include "unicode/locid.h"
#include "unicode/ucal.h"
#include "unicode/dtptngen.h"

U_NAMESPACE_BEGIN

/**
 * DateIntervalInfo is a public class for encapsulating localizable
 * date time interval patterns. It is used by DateIntervalFormat.
 *
 * <P>
 * For most users, ordinary use of DateIntervalFormat does not need to create
 * DateIntervalInfo object directly.
 * DateIntervalFormat will take care of it when creating a date interval
 * formatter when user pass in skeleton and locale.
 *
 * <P>
 * For power users, who want to create their own date interval patterns,
 * or want to re-set date interval patterns, they could do so by
 * directly creating DateIntervalInfo and manupulating it.
 *
 * <P>
 * Logically, the interval patterns are mappings
 * from (skeleton, the_largest_different_calendar_field)
 * to (date_interval_pattern).
 *
 * <P>
 * A skeleton
 * <ol>
 * <li>
 * only keeps the field pattern letter and ignores all other parts
 * in a pattern, such as space, punctuations, and string literals.
 * <li>
 * hides the order of fields.
 * <li>
 * might hide a field's pattern letter length.
 *
 * For those non-digit calendar fields, the pattern letter length is
 * important, such as MMM, MMMM, and MMMMM; EEE and EEEE,
 * and the field's pattern letter length is honored.
 *
 * For the digit calendar fields,  such as M or MM, d or dd, yy or yyyy,
 * the field pattern length is ignored and the best match, which is defined
 * in date time patterns, will be returned without honor the field pattern
 * letter length in skeleton.
 * </ol>
 *
 * <P>
 * The calendar fields we support for interval formatting are:
 * year, month, date, day-of-week, am-pm, hour, hour-of-day, and minute.
 * Those calendar fields can be defined in the following order:
 * year >  month > date > am-pm > hour >  minute
 *
 * The largest different calendar fields between 2 calendars is the
 * first different calendar field in above order.
 *
 * For example: the largest different calendar fields between &quot;Jan 10, 2007&quot;
 * and &quot;Feb 20, 2008&quot; is year.
 *
 * <P>
 * There is a set of pre-defined static skeleton strings.
 * There are pre-defined interval patterns for those pre-defined skeletons
 * in locales' resource files.
 * For example, for a skeleton UDAT_YEAR_ABBR_MONTH_DAY, which is  &quot;yMMMd&quot;,
 * in  en_US, if the largest different calendar field between date1 and date2
 * is &quot;year&quot;, the date interval pattern  is &quot;MMM d, yyyy - MMM d, yyyy&quot;,
 * such as &quot;Jan 10, 2007 - Jan 10, 2008&quot;.
 * If the largest different calendar field between date1 and date2 is &quot;month&quot;,
 * the date interval pattern is &quot;MMM d - MMM d, yyyy&quot;,
 * such as &quot;Jan 10 - Feb 10, 2007&quot;.
 * If the largest different calendar field between date1 and date2 is &quot;day&quot;,
 * the date interval pattern is &quot;MMM d-d, yyyy&quot;, such as &quot;Jan 10-20, 2007&quot;.
 *
 * For date skeleton, the interval patterns when year, or month, or date is
 * different are defined in resource files.
 * For time skeleton, the interval patterns when am/pm, or hour, or minute is
 * different are defined in resource files.
 *
 *
 * <P>
 * There are 2 dates in interval pattern. For most locales, the first date
 * in an interval pattern is the earlier date. There might be a locale in which
 * the first date in an interval pattern is the later date.
 * We use fallback format for the default order for the locale.
 * For example, if the fallback format is &quot;{0} - {1}&quot;, it means
 * the first date in the interval pattern for this locale is earlier date.
 * If the fallback format is &quot;{1} - {0}&quot;, it means the first date is the
 * later date.
 * For a particular interval pattern, the default order can be overriden
 * by prefixing &quot;latestFirst:&quot; or &quot;earliestFirst:&quot; to the interval pattern.
 * For example, if the fallback format is &quot;{0}-{1}&quot;,
 * but for skeleton &quot;yMMMd&quot;, the interval pattern when day is different is
 * &quot;latestFirst:d-d MMM yy&quot;, it means by default, the first date in interval
 * pattern is the earlier date. But for skeleton &quot;yMMMd&quot;, when day is different,
 * the first date in &quot;d-d MMM yy&quot; is the later date.
 *
 * <P>
 * The recommended way to create a DateIntervalFormat object is to pass in
 * the locale.
 * By using a Locale parameter, the DateIntervalFormat object is
 * initialized with the pre-defined interval patterns for a given or
 * default locale.
 * <P>
 * Users can also create DateIntervalFormat object
 * by supplying their own interval patterns.
 * It provides flexibility for power users.
 *
 * <P>
 * After a DateIntervalInfo object is created, clients may modify
 * the interval patterns using setIntervalPattern function as so desired.
 * Currently, users can only set interval patterns when the following
 * calendar fields are different: ERA, YEAR, MONTH, DATE,  DAY_OF_MONTH,
 * DAY_OF_WEEK, AM_PM,  HOUR, HOUR_OF_DAY, and MINUTE.
 * Interval patterns when other calendar fields are different is not supported.
 * <P>
 * DateIntervalInfo objects are cloneable.
 * When clients obtain a DateIntervalInfo object,
 * they can feel free to modify it as necessary.
 * <P>
 * DateIntervalInfo are not expected to be subclassed.
 * Data for a calendar is loaded out of resource bundles.
 * Through ICU 4.4, date interval patterns are only supported in the Gregorian
 * calendar; non-Gregorian calendars are supported from ICU 4.4.1.
 * @stable ICU 4.0
**/

class U_I18N_API DateIntervalInfo U_FINAL : public UObject {
public:
    // Do not enclose the protected default constructor with #ifndef U_HIDE_INTERNAL_API
    // or else the compiler will create a public default constructor.
    /**
     * Default constructor.
     * It does not initialize any interval patterns except
     * that it initialize default fall-back pattern as "{0} - {1}",
     * which can be reset by setFallbackIntervalPattern().
     * It should be followed by setFallbackIntervalPattern() and
     * setIntervalPattern(),
     * and is recommended to be used only for power users who
     * wants to create their own interval patterns and use them to create
     * date interval formatter.
     * @param status   output param set to success/failure code on exit
     * @internal ICU 4.0
     */
    DateIntervalInfo(UErrorCode& status);


    /**
     * Construct DateIntervalInfo for the given locale,
     * @param locale  the interval patterns are loaded from the appropriate calendar
     *                data (specified calendar or default calendar) in this locale.
     * @param status  output param set to success/failure code on exit
     * @stable ICU 4.0
     */
    DateIntervalInfo(const Locale& locale, UErrorCode& status);


    /**
     * Copy constructor.
     * @stable ICU 4.0
     */
    DateIntervalInfo(const DateIntervalInfo&);

    /**
     * Assignment operator
     * @stable ICU 4.0
     */
    DateIntervalInfo& operator=(const DateIntervalInfo&);

    /**
     * Clone this object polymorphically.
     * The caller owns the result and should delete it when done.
     * @return   a copy of the object
     * @stable ICU 4.0
     */
    virtual DateIntervalInfo* clone(void) const;

    /**
     * Destructor.
     * It is virtual to be safe, but it is not designed to be subclassed.
     * @stable ICU 4.0
     */
    virtual ~DateIntervalInfo();


    /**
     * Return true if another object is semantically equal to this one.
     *
     * @param other    the DateIntervalInfo object to be compared with.
     * @return         true if other is semantically equal to this.
     * @stable ICU 4.0
     */
    virtual UBool operator==(const DateIntervalInfo& other) const;

    /**
     * Return true if another object is semantically unequal to this one.
     *
     * @param other    the DateIntervalInfo object to be compared with.
     * @return         true if other is semantically unequal to this.
     * @stable ICU 4.0
     */
    UBool operator!=(const DateIntervalInfo& other) const;



    /**
     * Provides a way for client to build interval patterns.
     * User could construct DateIntervalInfo by providing a list of skeletons
     * and their patterns.
     * <P>
     * For example:
     * <pre>
     * UErrorCode status = U_ZERO_ERROR;
     * DateIntervalInfo dIntervalInfo = new DateIntervalInfo();
     * dIntervalInfo->setFallbackIntervalPattern("{0} ~ {1}");
     * dIntervalInfo->setIntervalPattern("yMd", UCAL_YEAR, "'from' yyyy-M-d 'to' yyyy-M-d", status);
     * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_MONTH, "'from' yyyy MMM d 'to' MMM d", status);
     * dIntervalInfo->setIntervalPattern("yMMMd", UCAL_DAY, "yyyy MMM d-d", status, status);
     * </pre>
     *
     * Restriction:
     * Currently, users can only set interval patterns when the following
     * calendar fields are different: ERA, YEAR, MONTH, DATE,  DAY_OF_MONTH,
     * DAY_OF_WEEK, AM_PM,  HOUR, HOUR_OF_DAY, and MINUTE.
     * Interval patterns when other calendar fields are different are
     * not supported.
     *
     * @param skeleton         the skeleton on which interval pattern based
     * @param lrgDiffCalUnit   the largest different calendar unit.
     * @param intervalPattern  the interval pattern on the largest different
     *                         calendar unit.
     *                         For example, if lrgDiffCalUnit is
     *                         "year", the interval pattern for en_US when year
     *                         is different could be "'from' yyyy 'to' yyyy".
     * @param status           output param set to success/failure code on exit
     * @stable ICU 4.0
     */
    void setIntervalPattern(const UnicodeString& skeleton,
                            UCalendarDateFields lrgDiffCalUnit,
                            const UnicodeString& intervalPattern,
                            UErrorCode& status);

    /**
     * Get the interval pattern given skeleton and
     * the largest different calendar field.
     * @param skeleton   the skeleton
     * @param field      the largest different calendar field
     * @param result     output param to receive the pattern
     * @param status     output param set to success/failure code on exit
     * @return a reference to 'result'
     * @stable ICU 4.0
     */
    UnicodeString& getIntervalPattern(const UnicodeString& skeleton,
                                      UCalendarDateFields field,
                                      UnicodeString& result,
                                      UErrorCode& status) const;

    /**
     * Get the fallback interval pattern.
     * @param  result   output param to receive the pattern
     * @return a reference to 'result'
     * @stable ICU 4.0
     */
    UnicodeString& getFallbackIntervalPattern(UnicodeString& result) const;


    /**
     * Re-set the fallback interval pattern.
     *
     * In construction, default fallback pattern is set as "{0} - {1}".
     * And constructor taking locale as parameter will set the
     * fallback pattern as what defined in the locale resource file.
     *
     * This method provides a way for user to replace the fallback pattern.
     *
     * @param fallbackPattern  fall-back interval pattern.
     * @param status           output param set to success/failure code on exit
     * @stable ICU 4.0
     */
    void setFallbackIntervalPattern(const UnicodeString& fallbackPattern,
                                    UErrorCode& status);


    /** Get default order -- whether the first date in pattern is later date
                             or not.
     * return default date ordering in interval pattern. TRUE if the first date
     *        in pattern is later date, FALSE otherwise.
     * @stable ICU 4.0
     */
    UBool getDefaultOrder() const;


    /**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @stable ICU 4.0
     */
    virtual UClassID getDynamicClassID() const;

    /**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @stable ICU 4.0
     */
    static UClassID U_EXPORT2 getStaticClassID();


private:
    /**
     * DateIntervalFormat will need access to
     * getBestSkeleton(), parseSkeleton(), enum IntervalPatternIndex,
     * and calendarFieldToPatternIndex().
     *
     * Instead of making above public,
     * make DateIntervalFormat a friend of DateIntervalInfo.
     */
    friend class DateIntervalFormat;

    /**
     * Internal struct used to load resource bundle data.
     */
    struct DateIntervalSink;

    /**
     * Following is for saving the interval patterns.
     * We only support interval patterns on
     * ERA, YEAR, MONTH, DAY, AM_PM, HOUR, and MINUTE
     */
    enum IntervalPatternIndex
    {
        kIPI_ERA,
        kIPI_YEAR,
        kIPI_MONTH,
        kIPI_DATE,
        kIPI_AM_PM,
        kIPI_HOUR,
        kIPI_MINUTE,
        kIPI_SECOND,
        kIPI_MAX_INDEX
    };
public:
#ifndef U_HIDE_INTERNAL_API
    /**
     * Max index for stored interval patterns
     * @internal ICU 4.4
     */
     enum {
         kMaxIntervalPatternIndex = kIPI_MAX_INDEX
     };
#endif  /* U_HIDE_INTERNAL_API */
private:


    /**
     * Initialize the DateIntervalInfo from locale
     * @param locale   the given locale.
     * @param status   output param set to success/failure code on exit
     */
    void initializeData(const Locale& locale, UErrorCode& status);


    /* Set Interval pattern.
     *
     * It sets interval pattern into the hash map.
     *
     * @param skeleton         skeleton on which the interval pattern based
     * @param lrgDiffCalUnit   the largest different calendar unit.
     * @param intervalPattern  the interval pattern on the largest different
     *                         calendar unit.
     * @param status           output param set to success/failure code on exit
     */
    void setIntervalPatternInternally(const UnicodeString& skeleton,
                                      UCalendarDateFields lrgDiffCalUnit,
                                      const UnicodeString& intervalPattern,
                                      UErrorCode& status);


    /**given an input skeleton, get the best match skeleton
     * which has pre-defined interval pattern in resource file.
     * Also return the difference between the input skeleton
     * and the best match skeleton.
     *
     * TODO (xji): set field weight or
     *             isolate the funtionality in DateTimePatternGenerator
     * @param  skeleton               input skeleton
     * @param  bestMatchDistanceInfo  the difference between input skeleton
     *                                and best match skeleton.
     *         0, if there is exact match for input skeleton
     *         1, if there is only field width difference between
     *            the best match and the input skeleton
     *         2, the only field difference is 'v' and 'z'
     *        -1, if there is calendar field difference between
     *            the best match and the input skeleton
     * @return                        best match skeleton
     */
    const UnicodeString* getBestSkeleton(const UnicodeString& skeleton,
                                         int8_t& bestMatchDistanceInfo) const;


    /**
     * Parse skeleton, save each field's width.
     * It is used for looking for best match skeleton,
     * and adjust pattern field width.
     * @param skeleton            skeleton to be parsed
     * @param skeletonFieldWidth  parsed skeleton field width
     */
    static void U_EXPORT2 parseSkeleton(const UnicodeString& skeleton,
                                        int32_t* skeletonFieldWidth);


    /**
     * Check whether one field width is numeric while the other is string.
     *
     * TODO (xji): make it general
     *
     * @param fieldWidth          one field width
     * @param anotherFieldWidth   another field width
     * @param patternLetter       pattern letter char
     * @return true if one field width is numeric and the other is string,
     *         false otherwise.
     */
    static UBool U_EXPORT2 stringNumeric(int32_t fieldWidth,
                                         int32_t anotherFieldWidth,
                                         char patternLetter);


    /**
     * Convert calendar field to the interval pattern index in
     * hash table.
     *
     * Since we only support the following calendar fields:
     * ERA, YEAR, MONTH, DATE,  DAY_OF_MONTH, DAY_OF_WEEK,
     * AM_PM,  HOUR, HOUR_OF_DAY, and MINUTE,
     * We reserve only 4 interval patterns for a skeleton.
     *
     * @param field    calendar field
     * @param status   output param set to success/failure code on exit
     * @return  interval pattern index in hash table
     */
    static IntervalPatternIndex U_EXPORT2 calendarFieldToIntervalIndex(
                                                      UCalendarDateFields field,
                                                      UErrorCode& status);


    /**
     * delete hash table (of type fIntervalPatterns).
     *
     * @param hTable  hash table to be deleted
     */
    void deleteHash(Hashtable* hTable);


    /**
     * initialize hash table (of type fIntervalPatterns).
     *
     * @param status   output param set to success/failure code on exit
     * @return         hash table initialized
     */
    Hashtable* initHash(UErrorCode& status);



    /**
     * copy hash table (of type fIntervalPatterns).
     *
     * @param source   the source to copy from
     * @param target   the target to copy to
     * @param status   output param set to success/failure code on exit
     */
    void copyHash(const Hashtable* source, Hashtable* target, UErrorCode& status);


    // data members
    // fallback interval pattern
    UnicodeString fFallbackIntervalPattern;
    // default order
    UBool fFirstDateInPtnIsLaterDate;

    // HashMap<UnicodeString, UnicodeString[kIPI_MAX_INDEX]>
    // HashMap( skeleton, pattern[largest_different_field] )
    Hashtable* fIntervalPatterns;

};// end class DateIntervalInfo


inline UBool
DateIntervalInfo::operator!=(const DateIntervalInfo& other) const {
    return !operator==(other);
}


U_NAMESPACE_END

#endif

#endif