aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/icu/include/unicode/tblcoll.h
blob: 43cf35d1a81b4c391a0c4af211df44e1a2829aa4 (plain) (blame)
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
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
* Copyright (C) 1996-2016, International Business Machines Corporation and
* others. All Rights Reserved.
******************************************************************************
*/

/**
 * \file
 * \brief C++ API: The RuleBasedCollator class implements the Collator abstract base class.
 */

/**
* File tblcoll.h
*
* Created by: Helena Shih
*
* Modification History:
*
*  Date        Name        Description
*  2/5/97      aliu        Added streamIn and streamOut methods.  Added
*                          constructor which reads RuleBasedCollator object from
*                          a binary file.  Added writeToFile method which streams
*                          RuleBasedCollator out to a binary file.  The streamIn
*                          and streamOut methods use istream and ostream objects
*                          in binary mode.
*  2/12/97     aliu        Modified to use TableCollationData sub-object to
*                          hold invariant data.
*  2/13/97     aliu        Moved several methods into this class from Collation.
*                          Added a private RuleBasedCollator(Locale&) constructor,
*                          to be used by Collator::createDefault().  General
*                          clean up.
*  2/20/97     helena      Added clone, operator==, operator!=, operator=, and copy
*                          constructor and getDynamicClassID.
*  3/5/97      aliu        Modified constructFromFile() to add parameter
*                          specifying whether or not binary loading is to be
*                          attempted.  This is required for dynamic rule loading.
* 05/07/97     helena      Added memory allocation error detection.
*  6/17/97     helena      Added IDENTICAL strength for compare, changed getRules to
*                          use MergeCollation::getPattern.
*  6/20/97     helena      Java class name change.
*  8/18/97     helena      Added internal API documentation.
* 09/03/97     helena      Added createCollationKeyValues().
* 02/10/98     damiba      Added compare with "length" parameter
* 08/05/98     erm         Synched with 1.2 version of RuleBasedCollator.java
* 04/23/99     stephen     Removed EDecompositionMode, merged with
*                          Normalizer::EMode
* 06/14/99     stephen     Removed kResourceBundleSuffix
* 11/02/99     helena      Collator performance enhancements.  Eliminates the
*                          UnicodeString construction and special case for NO_OP.
* 11/23/99     srl         More performance enhancements. Updates to NormalizerIterator
*                          internal state management.
* 12/15/99     aliu        Update to support Thai collation.  Move NormalizerIterator
*                          to implementation file.
* 01/29/01     synwee      Modified into a C++ wrapper which calls C API
*                          (ucol.h)
* 2012-2014    markus      Rewritten in C++ again.
*/

#ifndef TBLCOLL_H
#define TBLCOLL_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#if !UCONFIG_NO_COLLATION

#include "unicode/coll.h"
#include "unicode/locid.h"
#include "unicode/uiter.h"
#include "unicode/ucol.h"

U_NAMESPACE_BEGIN

struct CollationCacheEntry;
struct CollationData;
struct CollationSettings;
struct CollationTailoring;
/**
* @stable ICU 2.0
*/
class StringSearch;
/**
* @stable ICU 2.0
*/
class CollationElementIterator;
class CollationKey;
class SortKeyByteSink;
class UnicodeSet;
class UnicodeString;
class UVector64;

/**
 * The RuleBasedCollator class provides the implementation of
 * Collator, using data-driven tables. The user can create a customized
 * table-based collation.
 * <p>
 * For more information about the collation service see
 * <a href="https://unicode-org.github.io/icu/userguide/collation">the User Guide</a>.
 * <p>
 * Collation service provides correct sorting orders for most locales supported in ICU.
 * If specific data for a locale is not available, the orders eventually falls back
 * to the <a href="http://www.unicode.org/reports/tr35/tr35-collation.html#Root_Collation">CLDR root sort order</a>.
 * <p>
 * Sort ordering may be customized by providing your own set of rules. For more on
 * this subject see the <a href="https://unicode-org.github.io/icu/userguide/collation/customization">
 * Collation Customization</a> section of the User Guide.
 * <p>
 * Note, RuleBasedCollator is not to be subclassed.
 * @see        Collator
 */
class U_I18N_API RuleBasedCollator final : public Collator {
public:
    /**
     * RuleBasedCollator constructor. This takes the table rules and builds a
     * collation table out of them. Please see RuleBasedCollator class
     * description for more details on the collation rule syntax.
     * @param rules the collation rules to build the collation table from.
     * @param status reporting a success or an error.
     * @stable ICU 2.0
     */
    RuleBasedCollator(const UnicodeString& rules, UErrorCode& status);

    /**
     * RuleBasedCollator constructor. This takes the table rules and builds a
     * collation table out of them. Please see RuleBasedCollator class
     * description for more details on the collation rule syntax.
     * @param rules the collation rules to build the collation table from.
     * @param collationStrength strength for comparison
     * @param status reporting a success or an error.
     * @stable ICU 2.0
     */
    RuleBasedCollator(const UnicodeString& rules,
                       ECollationStrength collationStrength,
                       UErrorCode& status);

    /**
     * RuleBasedCollator constructor. This takes the table rules and builds a
     * collation table out of them. Please see RuleBasedCollator class
     * description for more details on the collation rule syntax.
     * @param rules the collation rules to build the collation table from.
     * @param decompositionMode the normalisation mode
     * @param status reporting a success or an error.
     * @stable ICU 2.0
     */
    RuleBasedCollator(const UnicodeString& rules,
                    UColAttributeValue decompositionMode,
                    UErrorCode& status);

    /**
     * RuleBasedCollator constructor. This takes the table rules and builds a
     * collation table out of them. Please see RuleBasedCollator class
     * description for more details on the collation rule syntax.
     * @param rules the collation rules to build the collation table from.
     * @param collationStrength strength for comparison
     * @param decompositionMode the normalisation mode
     * @param status reporting a success or an error.
     * @stable ICU 2.0
     */
    RuleBasedCollator(const UnicodeString& rules,
                    ECollationStrength collationStrength,
                    UColAttributeValue decompositionMode,
                    UErrorCode& status);

#ifndef U_HIDE_INTERNAL_API
    /**
     * TODO: document & propose as public API
     * @internal
     */
    RuleBasedCollator(const UnicodeString &rules,
                      UParseError &parseError, UnicodeString &reason,
                      UErrorCode &errorCode);
#endif  /* U_HIDE_INTERNAL_API */

    /**
     * Copy constructor.
     * @param other the RuleBasedCollator object to be copied
     * @stable ICU 2.0
     */
    RuleBasedCollator(const RuleBasedCollator& other);


    /** Opens a collator from a collator binary image created using
    *  cloneBinary. Binary image used in instantiation of the
    *  collator remains owned by the user and should stay around for
    *  the lifetime of the collator. The API also takes a base collator
    *  which must be the root collator.
    *  @param bin binary image owned by the user and required through the
    *             lifetime of the collator
    *  @param length size of the image. If negative, the API will try to
    *                figure out the length of the image
    *  @param base Base collator, for lookup of untailored characters.
    *              Must be the root collator, must not be nullptr.
    *              The base is required to be present through the lifetime of the collator.
    *  @param status for catching errors
    *  @return newly created collator
    *  @see cloneBinary
    *  @stable ICU 3.4
    */
    RuleBasedCollator(const uint8_t *bin, int32_t length,
                    const RuleBasedCollator *base,
                    UErrorCode &status);

    /**
     * Destructor.
     * @stable ICU 2.0
     */
    virtual ~RuleBasedCollator();

    /**
     * Assignment operator.
     * @param other other RuleBasedCollator object to copy from.
     * @stable ICU 2.0
     */
    RuleBasedCollator& operator=(const RuleBasedCollator& other);

    /**
     * Returns true if argument is the same as this object.
     * @param other Collator object to be compared.
     * @return true if arguments is the same as this object.
     * @stable ICU 2.0
     */
    virtual bool operator==(const Collator& other) const override;

    /**
     * Makes a copy of this object.
     * @return a copy of this object, owned by the caller
     * @stable ICU 2.0
     */
    virtual RuleBasedCollator* clone() const override;

    /**
     * Creates a collation element iterator for the source string. The caller of
     * this method is responsible for the memory management of the return
     * pointer.
     * @param source the string over which the CollationElementIterator will
     *        iterate.
     * @return the collation element iterator of the source string using this as
     *         the based Collator.
     * @stable ICU 2.2
     */
    virtual CollationElementIterator* createCollationElementIterator(
                                           const UnicodeString& source) const;

    /**
     * Creates a collation element iterator for the source. The caller of this
     * method is responsible for the memory management of the returned pointer.
     * @param source the CharacterIterator which produces the characters over
     *        which the CollationElementItgerator will iterate.
     * @return the collation element iterator of the source using this as the
     *         based Collator.
     * @stable ICU 2.2
     */
    virtual CollationElementIterator* createCollationElementIterator(
                                         const CharacterIterator& source) const;

    // Make deprecated versions of Collator::compare() visible.
    using Collator::compare;

    /**
    * The comparison function compares the character data stored in two
    * different strings. Returns information about whether a string is less
    * than, greater than or equal to another string.
    * @param source the source string to be compared with.
    * @param target the string that is to be compared with the source string.
    * @param status possible error code
    * @return Returns an enum value. UCOL_GREATER if source is greater
    * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
    * than target
    * @stable ICU 2.6
    **/
    virtual UCollationResult compare(const UnicodeString& source,
                                     const UnicodeString& target,
                                     UErrorCode &status) const override;

    /**
    * Does the same thing as compare but limits the comparison to a specified
    * length
    * @param source the source string to be compared with.
    * @param target the string that is to be compared with the source string.
    * @param length the length the comparison is limited to
    * @param status possible error code
    * @return Returns an enum value. UCOL_GREATER if source (up to the specified
    *         length) is greater than target; UCOL_EQUAL if source (up to specified
    *         length) is equal to target; UCOL_LESS if source (up to the specified
    *         length) is less  than target.
    * @stable ICU 2.6
    */
    virtual UCollationResult compare(const UnicodeString& source,
                                     const UnicodeString& target,
                                     int32_t length,
                                     UErrorCode &status) const override;

    /**
    * The comparison function compares the character data stored in two
    * different string arrays. Returns information about whether a string array
    * is less than, greater than or equal to another string array.
    * @param source the source string array to be compared with.
    * @param sourceLength the length of the source string array.  If this value
    *        is equal to -1, the string array is null-terminated.
    * @param target the string that is to be compared with the source string.
    * @param targetLength the length of the target string array.  If this value
    *        is equal to -1, the string array is null-terminated.
    * @param status possible error code
    * @return Returns an enum value. UCOL_GREATER if source is greater
    * than target; UCOL_EQUAL if source is equal to target; UCOL_LESS if source is less
    * than target
    * @stable ICU 2.6
    */
    virtual UCollationResult compare(const char16_t* source, int32_t sourceLength,
                                     const char16_t* target, int32_t targetLength,
                                     UErrorCode &status) const override;

    /**
     * Compares two strings using the Collator.
     * Returns whether the first one compares less than/equal to/greater than
     * the second one.
     * This version takes UCharIterator input.
     * @param sIter the first ("source") string iterator
     * @param tIter the second ("target") string iterator
     * @param status ICU status
     * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
     * @stable ICU 4.2
     */
    virtual UCollationResult compare(UCharIterator &sIter,
                                     UCharIterator &tIter,
                                     UErrorCode &status) const override;

    /**
     * Compares two UTF-8 strings using the Collator.
     * Returns whether the first one compares less than/equal to/greater than
     * the second one.
     * This version takes UTF-8 input.
     * Note that a StringPiece can be implicitly constructed
     * from a std::string or a NUL-terminated const char * string.
     * @param source the first UTF-8 string
     * @param target the second UTF-8 string
     * @param status ICU status
     * @return UCOL_LESS, UCOL_EQUAL or UCOL_GREATER
     * @stable ICU 51
     */
    virtual UCollationResult compareUTF8(const StringPiece &source,
                                         const StringPiece &target,
                                         UErrorCode &status) const override;

    /**
     * Transforms the string into a series of characters
     * that can be compared with CollationKey.compare().
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source the source string.
     * @param key the transformed key of the source string.
     * @param status the error code status.
     * @return the transformed key.
     * @see CollationKey
     * @stable ICU 2.0
     */
    virtual CollationKey& getCollationKey(const UnicodeString& source,
                                          CollationKey& key,
                                          UErrorCode& status) const override;

    /**
     * Transforms a specified region of the string into a series of characters
     * that can be compared with CollationKey.compare.
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source the source string.
     * @param sourceLength the length of the source string.
     * @param key the transformed key of the source string.
     * @param status the error code status.
     * @return the transformed key.
     * @see CollationKey
     * @stable ICU 2.0
     */
    virtual CollationKey& getCollationKey(const char16_t *source,
                                          int32_t sourceLength,
                                          CollationKey& key,
                                          UErrorCode& status) const override;

    /**
     * Generates the hash code for the rule-based collation object.
     * @return the hash code.
     * @stable ICU 2.0
     */
    virtual int32_t hashCode() const override;

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
    * Gets the locale of the Collator
    * @param type can be either requested, valid or actual locale. For more
    *             information see the definition of ULocDataLocaleType in
    *             uloc.h
    * @param status the error code status.
    * @return locale where the collation data lives. If the collator
    *         was instantiated from rules, locale is empty.
    * @deprecated ICU 2.8 likely to change in ICU 3.0, based on feedback
    */
    virtual Locale getLocale(ULocDataLocaleType type, UErrorCode& status) const override;
#endif  // U_FORCE_HIDE_DEPRECATED_API

    /**
     * Gets the tailoring rules for this collator.
     * @return the collation tailoring from which this collator was created
     * @stable ICU 2.0
     */
    const UnicodeString& getRules() const;

    /**
     * Gets the version information for a Collator.
     * @param info the version # information, the result will be filled in
     * @stable ICU 2.0
     */
    virtual void getVersion(UVersionInfo info) const override;

#ifndef U_HIDE_DEPRECATED_API
    /**
     * Returns the maximum length of any expansion sequences that end with the
     * specified comparison order.
     *
     * This is specific to the kind of collation element values and sequences
     * returned by the CollationElementIterator.
     * Call CollationElementIterator::getMaxExpansion() instead.
     *
     * @param order a collation order returned by CollationElementIterator::previous
     *              or CollationElementIterator::next.
     * @return maximum size of the expansion sequences ending with the collation
     *         element, or 1 if the collation element does not occur at the end of
     *         any expansion sequence
     * @see CollationElementIterator#getMaxExpansion
     * @deprecated ICU 51 Use CollationElementIterator::getMaxExpansion() instead.
     */
    int32_t getMaxExpansion(int32_t order) const;
#endif  /* U_HIDE_DEPRECATED_API */

    /**
     * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This
     * method is to implement a simple version of RTTI, since not all C++
     * compilers support genuine RTTI. Polymorphic operator==() and clone()
     * methods call this method.
     * @return The class ID for this object. All objects of a given class have
     *         the same class ID. Objects of other classes have different class
     *         IDs.
     * @stable ICU 2.0
     */
    virtual UClassID getDynamicClassID(void) const override;

    /**
     * Returns the class ID for this class. This is useful only for comparing to
     * a return value from getDynamicClassID(). For example:
     * <pre>
     * Base* polymorphic_pointer = createPolymorphicObject();
     * if (polymorphic_pointer->getDynamicClassID() ==
     *                                          Derived::getStaticClassID()) ...
     * </pre>
     * @return The class ID for all objects of this class.
     * @stable ICU 2.0
     */
    static UClassID U_EXPORT2 getStaticClassID(void);

#ifndef U_HIDE_DEPRECATED_API
    /**
     * Do not use this method: The caller and the ICU library might use different heaps.
     * Use cloneBinary() instead which writes to caller-provided memory.
     *
     * Returns a binary format of this collator.
     * @param length Returns the length of the data, in bytes
     * @param status the error code status.
     * @return memory, owned by the caller, of size 'length' bytes.
     * @deprecated ICU 52. Use cloneBinary() instead.
     */
    uint8_t *cloneRuleData(int32_t &length, UErrorCode &status) const;
#endif  /* U_HIDE_DEPRECATED_API */

    /** Creates a binary image of a collator. This binary image can be stored and
    *  later used to instantiate a collator using ucol_openBinary.
    *  This API supports preflighting.
    *  @param buffer a fill-in buffer to receive the binary image
    *  @param capacity capacity of the destination buffer
    *  @param status for catching errors
    *  @return size of the image
    *  @see ucol_openBinary
    *  @stable ICU 3.4
    */
    int32_t cloneBinary(uint8_t *buffer, int32_t capacity, UErrorCode &status) const;

    /**
     * Returns current rules. Delta defines whether full rules are returned or
     * just the tailoring.
     *
     * getRules(void) should normally be used instead.
     * See https://unicode-org.github.io/icu/userguide/collation/customization#building-on-existing-locales
     * @param delta one of UCOL_TAILORING_ONLY, UCOL_FULL_RULES.
     * @param buffer UnicodeString to store the result rules
     * @stable ICU 2.2
     * @see UCOL_FULL_RULES
     */
    void getRules(UColRuleOption delta, UnicodeString &buffer) const;

    /**
     * Universal attribute setter
     * @param attr attribute type
     * @param value attribute value
     * @param status to indicate whether the operation went on smoothly or there were errors
     * @stable ICU 2.2
     */
    virtual void setAttribute(UColAttribute attr, UColAttributeValue value,
                              UErrorCode &status) override;

    /**
     * Universal attribute getter.
     * @param attr attribute type
     * @param status to indicate whether the operation went on smoothly or there were errors
     * @return attribute value
     * @stable ICU 2.2
     */
    virtual UColAttributeValue getAttribute(UColAttribute attr,
                                            UErrorCode &status) const override;

    /**
     * Sets the variable top to the top of the specified reordering group.
     * The variable top determines the highest-sorting character
     * which is affected by UCOL_ALTERNATE_HANDLING.
     * If that attribute is set to UCOL_NON_IGNORABLE, then the variable top has no effect.
     * @param group one of UCOL_REORDER_CODE_SPACE, UCOL_REORDER_CODE_PUNCTUATION,
     *              UCOL_REORDER_CODE_SYMBOL, UCOL_REORDER_CODE_CURRENCY;
     *              or UCOL_REORDER_CODE_DEFAULT to restore the default max variable group
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @see getMaxVariable
     * @stable ICU 53
     */
    virtual Collator &setMaxVariable(UColReorderCode group, UErrorCode &errorCode) override;

    /**
     * Returns the maximum reordering group whose characters are affected by UCOL_ALTERNATE_HANDLING.
     * @return the maximum variable reordering group.
     * @see setMaxVariable
     * @stable ICU 53
     */
    virtual UColReorderCode getMaxVariable() const override;

#ifndef U_FORCE_HIDE_DEPRECATED_API
    /**
     * Sets the variable top to the primary weight of the specified string.
     *
     * Beginning with ICU 53, the variable top is pinned to
     * the top of one of the supported reordering groups,
     * and it must not be beyond the last of those groups.
     * See setMaxVariable().
     * @param varTop one or more (if contraction) char16_ts to which the variable top should be set
     * @param len length of variable top string. If -1 it is considered to be zero terminated.
     * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
     *    U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction<br>
     *    U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
     *    the last reordering group supported by setMaxVariable()
     * @return variable top primary weight
     * @deprecated ICU 53 Call setMaxVariable() instead.
     */
    virtual uint32_t setVariableTop(const char16_t *varTop, int32_t len, UErrorCode &status) override;

    /**
     * Sets the variable top to the primary weight of the specified string.
     *
     * Beginning with ICU 53, the variable top is pinned to
     * the top of one of the supported reordering groups,
     * and it must not be beyond the last of those groups.
     * See setMaxVariable().
     * @param varTop a UnicodeString size 1 or more (if contraction) of char16_ts to which the variable top should be set
     * @param status error code. If error code is set, the return value is undefined. Errors set by this function are: <br>
     *    U_CE_NOT_FOUND_ERROR if more than one character was passed and there is no such contraction<br>
     *    U_ILLEGAL_ARGUMENT_ERROR if the variable top is beyond
     *    the last reordering group supported by setMaxVariable()
     * @return variable top primary weight
     * @deprecated ICU 53 Call setMaxVariable() instead.
     */
    virtual uint32_t setVariableTop(const UnicodeString &varTop, UErrorCode &status) override;

    /**
     * Sets the variable top to the specified primary weight.
     *
     * Beginning with ICU 53, the variable top is pinned to
     * the top of one of the supported reordering groups,
     * and it must not be beyond the last of those groups.
     * See setMaxVariable().
     * @param varTop primary weight, as returned by setVariableTop or ucol_getVariableTop
     * @param status error code
     * @deprecated ICU 53 Call setMaxVariable() instead.
     */
    virtual void setVariableTop(uint32_t varTop, UErrorCode &status) override;
#endif  // U_FORCE_HIDE_DEPRECATED_API

    /**
     * Gets the variable top value of a Collator.
     * @param status error code (not changed by function). If error code is set, the return value is undefined.
     * @return the variable top primary weight
     * @see getMaxVariable
     * @stable ICU 2.0
     */
    virtual uint32_t getVariableTop(UErrorCode &status) const override;

    /**
     * Get a UnicodeSet that contains all the characters and sequences tailored in
     * this collator.
     * @param status      error code of the operation
     * @return a pointer to a UnicodeSet object containing all the
     *         code points and sequences that may sort differently than
     *         in the root collator. The object must be disposed of by using delete
     * @stable ICU 2.4
     */
    virtual UnicodeSet *getTailoredSet(UErrorCode &status) const override;

    /**
     * Get the sort key as an array of bytes from a UnicodeString.
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source string to be processed.
     * @param result buffer to store result in. If nullptr, number of bytes needed
     *        will be returned.
     * @param resultLength length of the result buffer. If if not enough the
     *        buffer will be filled to capacity.
     * @return Number of bytes needed for storing the sort key
     * @stable ICU 2.0
     */
    virtual int32_t getSortKey(const UnicodeString& source, uint8_t *result,
                               int32_t resultLength) const override;

    /**
     * Get the sort key as an array of bytes from a char16_t buffer.
     *
     * Note that sort keys are often less efficient than simply doing comparison.
     * For more details, see the ICU User Guide.
     *
     * @param source string to be processed.
     * @param sourceLength length of string to be processed. If -1, the string
     *        is 0 terminated and length will be decided by the function.
     * @param result buffer to store result in. If nullptr, number of bytes needed
     *        will be returned.
     * @param resultLength length of the result buffer. If if not enough the
     *        buffer will be filled to capacity.
     * @return Number of bytes needed for storing the sort key
     * @stable ICU 2.2
     */
    virtual int32_t getSortKey(const char16_t *source, int32_t sourceLength,
                               uint8_t *result, int32_t resultLength) const override;

    /**
     * Retrieves the reordering codes for this collator.
     * @param dest The array to fill with the script ordering.
     * @param destCapacity The length of dest. If it is 0, then dest may be nullptr and the function
     *  will only return the length of the result without writing any codes (pre-flighting).
     * @param status A reference to an error code value, which must not indicate
     * a failure before the function call.
     * @return The length of the script ordering array.
     * @see ucol_setReorderCodes
     * @see Collator#getEquivalentReorderCodes
     * @see Collator#setReorderCodes
     * @stable ICU 4.8
     */
     virtual int32_t getReorderCodes(int32_t *dest,
                                     int32_t destCapacity,
                                     UErrorCode& status) const override;

    /**
     * Sets the ordering of scripts for this collator.
     * @param reorderCodes An array of script codes in the new order. This can be nullptr if the
     * length is also set to 0. An empty array will clear any reordering codes on the collator.
     * @param reorderCodesLength The length of reorderCodes.
     * @param status error code
     * @see ucol_setReorderCodes
     * @see Collator#getReorderCodes
     * @see Collator#getEquivalentReorderCodes
     * @stable ICU 4.8
     */
     virtual void setReorderCodes(const int32_t* reorderCodes,
                                  int32_t reorderCodesLength,
                                  UErrorCode& status) override;

    /**
     * Implements ucol_strcollUTF8().
     * @internal
     */
    virtual UCollationResult internalCompareUTF8(
            const char *left, int32_t leftLength,
            const char *right, int32_t rightLength,
            UErrorCode &errorCode) const override;

    /** Get the short definition string for a collator. This internal API harvests the collator's
     *  locale and the attribute set and produces a string that can be used for opening
     *  a collator with the same attributes using the ucol_openFromShortString API.
     *  This string will be normalized.
     *  The structure and the syntax of the string is defined in the "Naming collators"
     *  section of the users guide:
     *  https://unicode-org.github.io/icu/userguide/collation/concepts#collator-naming-scheme
     *  This function supports preflighting.
     *
     *  This is internal, and intended to be used with delegate converters.
     *
     *  @param locale a locale that will appear as a collators locale in the resulting
     *                short string definition. If nullptr, the locale will be harvested
     *                from the collator.
     *  @param buffer space to hold the resulting string
     *  @param capacity capacity of the buffer
     *  @param status for returning errors. All the preflighting errors are featured
     *  @return length of the resulting string
     *  @see ucol_openFromShortString
     *  @see ucol_normalizeShortDefinitionString
     *  @see ucol_getShortDefinitionString
     *  @internal
     */
    virtual int32_t internalGetShortDefinitionString(const char *locale,
                                                     char *buffer,
                                                     int32_t capacity,
                                                     UErrorCode &status) const override;

    /**
     * Implements ucol_nextSortKeyPart().
     * @internal
     */
    virtual int32_t internalNextSortKeyPart(
            UCharIterator *iter, uint32_t state[2],
            uint8_t *dest, int32_t count, UErrorCode &errorCode) const override;

    // Do not enclose the default constructor with #ifndef U_HIDE_INTERNAL_API
    /**
     * Only for use in ucol_openRules().
     * @internal
     */
    RuleBasedCollator();

#ifndef U_HIDE_INTERNAL_API
    /**
     * Implements ucol_getLocaleByType().
     * Needed because the lifetime of the locale ID string must match that of the collator.
     * getLocale() returns a copy of a Locale, with minimal lifetime in a C wrapper.
     * @internal
     */
    const char *internalGetLocaleID(ULocDataLocaleType type, UErrorCode &errorCode) const;

    /**
     * Implements ucol_getContractionsAndExpansions().
     * Gets this collator's sets of contraction strings and/or
     * characters and strings that map to multiple collation elements (expansions).
     * If addPrefixes is true, then contractions that are expressed as
     * prefix/pre-context rules are included.
     * @param contractions if not nullptr, the set to hold the contractions
     * @param expansions if not nullptr, the set to hold the expansions
     * @param addPrefixes include prefix contextual mappings
     * @param errorCode in/out ICU error code
     * @internal
     */
    void internalGetContractionsAndExpansions(
            UnicodeSet *contractions, UnicodeSet *expansions,
            UBool addPrefixes, UErrorCode &errorCode) const;

    /**
     * Adds the contractions that start with character c to the set.
     * Ignores prefixes. Used by AlphabeticIndex.
     * @internal
     */
    void internalAddContractions(UChar32 c, UnicodeSet &set, UErrorCode &errorCode) const;

    /**
     * Implements from-rule constructors, and ucol_openRules().
     * @internal
     */
    void internalBuildTailoring(
            const UnicodeString &rules,
            int32_t strength,
            UColAttributeValue decompositionMode,
            UParseError *outParseError, UnicodeString *outReason,
            UErrorCode &errorCode);

    /** @internal */
    static inline RuleBasedCollator *rbcFromUCollator(UCollator *uc) {
        return dynamic_cast<RuleBasedCollator *>(fromUCollator(uc));
    }
    /** @internal */
    static inline const RuleBasedCollator *rbcFromUCollator(const UCollator *uc) {
        return dynamic_cast<const RuleBasedCollator *>(fromUCollator(uc));
    }

    /**
     * Appends the CEs for the string to the vector.
     * @internal for tests & tools
     */
    void internalGetCEs(const UnicodeString &str, UVector64 &ces, UErrorCode &errorCode) const;
#endif  // U_HIDE_INTERNAL_API

protected:
   /**
    * Used internally by registration to define the requested and valid locales.
    * @param requestedLocale the requested locale
    * @param validLocale the valid locale
    * @param actualLocale the actual locale
    * @internal
    */
    virtual void setLocales(const Locale& requestedLocale, const Locale& validLocale, const Locale& actualLocale) override;

private:
    friend class CollationElementIterator;
    friend class Collator;

    RuleBasedCollator(const CollationCacheEntry *entry);

    /**
     * Enumeration of attributes that are relevant for short definition strings
     * (e.g., ucol_getShortDefinitionString()).
     * Effectively extends UColAttribute.
     */
    enum Attributes {
        ATTR_VARIABLE_TOP = UCOL_ATTRIBUTE_COUNT,
        ATTR_LIMIT
    };

    void adoptTailoring(CollationTailoring *t, UErrorCode &errorCode);

    // Both lengths must be <0 or else both must be >=0.
    UCollationResult doCompare(const char16_t *left, int32_t leftLength,
                               const char16_t *right, int32_t rightLength,
                               UErrorCode &errorCode) const;
    UCollationResult doCompare(const uint8_t *left, int32_t leftLength,
                               const uint8_t *right, int32_t rightLength,
                               UErrorCode &errorCode) const;

    void writeSortKey(const char16_t *s, int32_t length,
                      SortKeyByteSink &sink, UErrorCode &errorCode) const;

    void writeIdenticalLevel(const char16_t *s, const char16_t *limit,
                             SortKeyByteSink &sink, UErrorCode &errorCode) const;

    const CollationSettings &getDefaultSettings() const;

    void setAttributeDefault(int32_t attribute) {
        explicitlySetAttributes &= ~((uint32_t)1 << attribute);
    }
    void setAttributeExplicitly(int32_t attribute) {
        explicitlySetAttributes |= (uint32_t)1 << attribute;
    }
    UBool attributeHasBeenSetExplicitly(int32_t attribute) const {
        // assert(0 <= attribute < ATTR_LIMIT);
        return (UBool)((explicitlySetAttributes & ((uint32_t)1 << attribute)) != 0);
    }

    /**
     * Tests whether a character is "unsafe" for use as a collation starting point.
     *
     * @param c code point or code unit
     * @return true if c is unsafe
     * @see CollationElementIterator#setOffset(int)
     */
    UBool isUnsafe(UChar32 c) const;

    static void U_CALLCONV computeMaxExpansions(const CollationTailoring *t, UErrorCode &errorCode);
    UBool initMaxExpansions(UErrorCode &errorCode) const;

    void setFastLatinOptions(CollationSettings &ownedSettings) const;

    const CollationData *data;
    const CollationSettings *settings;  // reference-counted
    const CollationTailoring *tailoring;  // alias of cacheEntry->tailoring
    const CollationCacheEntry *cacheEntry;  // reference-counted
    Locale validLocale;
    uint32_t explicitlySetAttributes;

    UBool actualLocaleIsSameAsValid;
};

U_NAMESPACE_END

#endif  // !UCONFIG_NO_COLLATION

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // TBLCOLL_H