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 (b6d82b1a6b02)

VCS Links

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
***************************************************************************
*   Copyright (C) 1999-2016 International Business Machines Corporation   *
*   and others. All rights reserved.                                      *
***************************************************************************

**********************************************************************
*   Date        Name        Description
*   10/22/99    alan        Creation.
*   11/11/99    rgillam     Complete port from Java.
**********************************************************************
*/

#ifndef RBBI_H
#define RBBI_H

#include "unicode/utypes.h"

/**
 * \file
 * \brief C++ API: Rule Based Break Iterator
 */

#if !UCONFIG_NO_BREAK_ITERATION

#include "unicode/brkiter.h"
#include "unicode/udata.h"
#include "unicode/parseerr.h"
#include "unicode/schriter.h"

U_NAMESPACE_BEGIN

/** @internal */
class  LanguageBreakEngine;
struct RBBIDataHeader;
class  RBBIDataWrapper;
class  UnhandledEngine;
class  UStack;

/**
 *
 * A subclass of BreakIterator whose behavior is specified using a list of rules.
 * <p>Instances of this class are most commonly created by the factory methods of
 *  BreakIterator::createWordInstance(), BreakIterator::createLineInstance(), etc.,
 *  and then used via the abstract API in class BreakIterator</p>
 *
 * <p>See the ICU User Guide for information on Break Iterator Rules.</p>
 *
 * <p>This class is not intended to be subclassed.</p>
 */
class U_COMMON_API RuleBasedBreakIterator /*U_FINAL*/ : public BreakIterator {

private:
    /**
     * The UText through which this BreakIterator accesses the text
     * @internal (private)
     */
    UText  fText;

#ifndef U_HIDE_INTERNAL_API
public:
#endif /* U_HIDE_INTERNAL_API */
    /**
     * The rule data for this BreakIterator instance.
     * Not for general use; Public only for testing purposes.
     * @internal
     */
    RBBIDataWrapper    *fData;
private:

    /**
      * The current  position of the iterator. Pinned, 0 < fPosition <= text.length.
      * Never has the value UBRK_DONE (-1).
      */
    int32_t         fPosition;

    /**
      * TODO:
      */
    int32_t         fRuleStatusIndex;

    /**
     *   Cache of previously determined boundary positions.
     */
    class BreakCache;
    BreakCache         *fBreakCache;

    /**
     *  Cache of boundary positions within a region of text that has been
     *  sub-divided by dictionary based breaking.
     */
    class DictionaryCache;
    DictionaryCache *fDictionaryCache;

    /**
     *
     * If present, UStack of LanguageBreakEngine objects that might handle
     * dictionary characters. Searched from top to bottom to find an object to
     * handle a given character.
     * @internal (private)
     */
    UStack              *fLanguageBreakEngines;

    /**
     *
     * If present, the special LanguageBreakEngine used for handling
     * characters that are in the dictionary set, but not handled by any
     * LanguageBreakEngine.
     * @internal (private)
     */
    UnhandledEngine     *fUnhandledBreakEngine;

    /**
     * Counter for the number of characters encountered with the "dictionary"
     *   flag set.
     * @internal (private)
     */
    uint32_t            fDictionaryCharCount;

    /**
     *   A character iterator that refers to the same text as the UText, above.
     *   Only included for compatibility with old API, which was based on CharacterIterators.
     *   Value may be adopted from outside, or one of fSCharIter or fDCharIter, below.
     */
    CharacterIterator  *fCharIter;

    /**
     *   When the input text is provided by a UnicodeString, this will point to
     *    a characterIterator that wraps that data.  Needed only for the
     *    implementation of getText(), a backwards compatibility issue.
     */
    StringCharacterIterator fSCharIter;

    /**
      * True when iteration has run off the end, and iterator functions should return UBRK_DONE.
      */
    UBool           fDone;

    //=======================================================================
    // constructors
    //=======================================================================

    /**
     * Constructor from a flattened set of RBBI data in malloced memory.
     *             RulesBasedBreakIterators built from a custom set of rules
     *             are created via this constructor; the rules are compiled
     *             into memory, then the break iterator is constructed here.
     *
     *             The break iterator adopts the memory, and will
     *             free it when done.
     * @internal (private)
     */
    RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status);

    /** @internal */
    friend class RBBIRuleBuilder;
    /** @internal */
    friend class BreakIterator;

public:

    /** Default constructor.  Creates an empty shell of an iterator, with no
     *  rules or text to iterate over.   Object can subsequently be assigned to.
     *  @stable ICU 2.2
     */
    RuleBasedBreakIterator();

    /**
     * Copy constructor.  Will produce a break iterator with the same behavior,
     * and which iterates over the same text, as the one passed in.
     * @param that The RuleBasedBreakIterator passed to be copied
     * @stable ICU 2.0
     */
    RuleBasedBreakIterator(const RuleBasedBreakIterator& that);

    /**
     * Construct a RuleBasedBreakIterator from a set of rules supplied as a string.
     * @param rules The break rules to be used.
     * @param parseError  In the event of a syntax error in the rules, provides the location
     *                    within the rules of the problem.
     * @param status Information on any errors encountered.
     * @stable ICU 2.2
     */
    RuleBasedBreakIterator( const UnicodeString    &rules,
                             UParseError           &parseError,
                             UErrorCode            &status);

    /**
     * Construct a RuleBasedBreakIterator from a set of precompiled binary rules.
     * Binary rules are obtained from RulesBasedBreakIterator::getBinaryRules().
     * Construction of a break iterator in this way is substantially faster than
     * construction from source rules.
     *
     * Ownership of the storage containing the compiled rules remains with the
     * caller of this function.  The compiled rules must not be  modified or
     * deleted during the life of the break iterator.
     *
     * The compiled rules are not compatible across different major versions of ICU.
     * The compiled rules are compatible only between machines with the same
     * byte ordering (little or big endian) and the same base character set family
     * (ASCII or EBCDIC).
     *
     * @see #getBinaryRules
     * @param compiledRules A pointer to the compiled break rules to be used.
     * @param ruleLength The length of the compiled break rules, in bytes.  This
     *   corresponds to the length value produced by getBinaryRules().
     * @param status Information on any errors encountered, including invalid
     *   binary rules.
     * @stable ICU 4.8
     */
    RuleBasedBreakIterator(const uint8_t *compiledRules,
                           uint32_t       ruleLength,
                           UErrorCode    &status);

    /**
     * This constructor uses the udata interface to create a BreakIterator
     * whose internal tables live in a memory-mapped file.  "image" is an
     * ICU UDataMemory handle for the pre-compiled break iterator tables.
     * @param image handle to the memory image for the break iterator data.
     *        Ownership of the UDataMemory handle passes to the Break Iterator,
     *        which will be responsible for closing it when it is no longer needed.
     * @param status Information on any errors encountered.
     * @see udata_open
     * @see #getBinaryRules
     * @stable ICU 2.8
     */
    RuleBasedBreakIterator(UDataMemory* image, UErrorCode &status);

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

    /**
     * Assignment operator.  Sets this iterator to have the same behavior,
     * and iterate over the same text, as the one passed in.
     * @param that The RuleBasedBreakItertor passed in
     * @return the newly created RuleBasedBreakIterator
     *  @stable ICU 2.0
     */
    RuleBasedBreakIterator& operator=(const RuleBasedBreakIterator& that);

    /**
     * Equality operator.  Returns TRUE if both BreakIterators are of the
     * same class, have the same behavior, and iterate over the same text.
     * @param that The BreakIterator to be compared for equality
     * @return TRUE if both BreakIterators are of the
     * same class, have the same behavior, and iterate over the same text.
     *  @stable ICU 2.0
     */
    virtual UBool operator==(const BreakIterator& that) const;

    /**
     * Not-equal operator.  If operator== returns TRUE, this returns FALSE,
     * and vice versa.
     * @param that The BreakIterator to be compared for inequality
     * @return TRUE if both BreakIterators are not same.
     *  @stable ICU 2.0
     */
    inline UBool operator!=(const BreakIterator& that) const;

    /**
     * Returns a newly-constructed RuleBasedBreakIterator with the same
     * behavior, and iterating over the same text, as this one.
     * Differs from the copy constructor in that it is polymorphic, and
     * will correctly clone (copy) a derived class.
     * clone() is thread safe.  Multiple threads may simultaneously
     * clone the same source break iterator.
     * @return a newly-constructed RuleBasedBreakIterator
     * @stable ICU 2.0
     */
    virtual BreakIterator* clone() const;

    /**
     * Compute a hash code for this BreakIterator
     * @return A hash code
     *  @stable ICU 2.0
     */
    virtual int32_t hashCode(void) const;

    /**
     * Returns the description used to create this iterator
     * @return the description used to create this iterator
     *  @stable ICU 2.0
     */
    virtual const UnicodeString& getRules(void) const;

    //=======================================================================
    // BreakIterator overrides
    //=======================================================================

    /**
     * <p>
     * Return a CharacterIterator over the text being analyzed.
     * The returned character iterator is owned by the break iterator, and must
     * not be deleted by the caller.  Repeated calls to this function may
     * return the same CharacterIterator.
     * </p>
     * <p>
     * The returned character iterator must not be used concurrently with
     * the break iterator.  If concurrent operation is needed, clone the
     * returned character iterator first and operate on the clone.
     * </p>
     * <p>
     * When the break iterator is operating on text supplied via a UText,
     * this function will fail.  Lacking any way to signal failures, it
     * returns an CharacterIterator containing no text.
     * The function getUText() provides similar functionality,
     * is reliable, and is more efficient.
     * </p>
     *
     * TODO:  deprecate this function?
     *
     * @return An iterator over the text being analyzed.
     * @stable ICU 2.0
     */
    virtual  CharacterIterator& getText(void) const;


    /**
      *  Get a UText for the text being analyzed.
      *  The returned UText is a shallow clone of the UText used internally
      *  by the break iterator implementation.  It can safely be used to
      *  access the text without impacting any break iterator operations,
      *  but the underlying text itself must not be altered.
      *
      * @param fillIn A UText to be filled in.  If NULL, a new UText will be
      *           allocated to hold the result.
      * @param status receives any error codes.
      * @return   The current UText for this break iterator.  If an input
      *           UText was provided, it will always be returned.
      * @stable ICU 3.4
      */
     virtual UText *getUText(UText *fillIn, UErrorCode &status) const;

    /**
     * Set the iterator to analyze a new piece of text.  This function resets
     * the current iteration position to the beginning of the text.
     * @param newText An iterator over the text to analyze.  The BreakIterator
     * takes ownership of the character iterator.  The caller MUST NOT delete it!
     *  @stable ICU 2.0
     */
    virtual void adoptText(CharacterIterator* newText);

    /**
     * Set the iterator to analyze a new piece of text.  This function resets
     * the current iteration position to the beginning of the text.
     *
     * The BreakIterator will retain a reference to the supplied string.
     * The caller must not modify or delete the text while the BreakIterator
     * retains the reference.
     *
     * @param newText The text to analyze.
     *  @stable ICU 2.0
     */
    virtual void setText(const UnicodeString& newText);

    /**
     * Reset the break iterator to operate over the text represented by
     * the UText.  The iterator position is reset to the start.
     *
     * This function makes a shallow clone of the supplied UText.  This means
     * that the caller is free to immediately close or otherwise reuse the
     * Utext that was passed as a parameter, but that the underlying text itself
     * must not be altered while being referenced by the break iterator.
     *
     * @param text    The UText used to change the text.
     * @param status  Receives any error codes.
     * @stable ICU 3.4
     */
    virtual void  setText(UText *text, UErrorCode &status);

    /**
     * Sets the current iteration position to the beginning of the text, position zero.
     * @return The offset of the beginning of the text, zero.
     *  @stable ICU 2.0
     */
    virtual int32_t first(void);

    /**
     * Sets the current iteration position to the end of the text.
     * @return The text's past-the-end offset.
     *  @stable ICU 2.0
     */
    virtual int32_t last(void);

    /**
     * Advances the iterator either forward or backward the specified number of steps.
     * Negative values move backward, and positive values move forward.  This is
     * equivalent to repeatedly calling next() or previous().
     * @param n The number of steps to move.  The sign indicates the direction
     * (negative is backwards, and positive is forwards).
     * @return The character offset of the boundary position n boundaries away from
     * the current one.
     *  @stable ICU 2.0
     */
    virtual int32_t next(int32_t n);

    /**
     * Advances the iterator to the next boundary position.
     * @return The position of the first boundary after this one.
     *  @stable ICU 2.0
     */
    virtual int32_t next(void);

    /**
     * Moves the iterator backwards, to the last boundary preceding this one.
     * @return The position of the last boundary position preceding this one.
     *  @stable ICU 2.0
     */
    virtual int32_t previous(void);

    /**
     * Sets the iterator to refer to the first boundary position following
     * the specified position.
     * @param offset The position from which to begin searching for a break position.
     * @return The position of the first break after the current position.
     *  @stable ICU 2.0
     */
    virtual int32_t following(int32_t offset);

    /**
     * Sets the iterator to refer to the last boundary position before the
     * specified position.
     * @param offset The position to begin searching for a break from.
     * @return The position of the last boundary before the starting position.
     *  @stable ICU 2.0
     */
    virtual int32_t preceding(int32_t offset);

    /**
     * Returns true if the specified position is a boundary position.  As a side
     * effect, leaves the iterator pointing to the first boundary position at
     * or after "offset".
     * @param offset the offset to check.
     * @return True if "offset" is a boundary position.
     *  @stable ICU 2.0
     */
    virtual UBool isBoundary(int32_t offset);

    /**
     * Returns the current iteration position. Note that UBRK_DONE is never
     * returned from this function; if iteration has run to the end of a
     * string, current() will return the length of the string while
     * next() will return UBRK_DONE).
     * @return The current iteration position.
     * @stable ICU 2.0
     */
    virtual int32_t current(void) const;


    /**
     * Return the status tag from the break rule that determined the boundary at
     * the current iteration position.  For break rules that do not specify a
     * status, a default value of 0 is returned.  If more than one break rule
     * would cause a boundary to be located at some position in the text,
     * the numerically largest of the applicable status values is returned.
     * <p>
     * Of the standard types of ICU break iterators, only word break and
     * line break provide status values.  The values are defined in
     * the header file ubrk.h.  For Word breaks, the status allows distinguishing between words
     * that contain alphabetic letters, "words" that appear to be numbers,
     * punctuation and spaces, words containing ideographic characters, and
     * more.  For Line Break, the status distinguishes between hard (mandatory) breaks
     * and soft (potential) break positions.
     * <p>
     * <code>getRuleStatus()</code> can be called after obtaining a boundary
     * position from <code>next()</code>, <code>previous()</code>, or
     * any other break iterator functions that returns a boundary position.
     * <p>
     * Note that <code>getRuleStatus()</code> returns the value corresponding to
     * <code>current()</code> index even after <code>next()</code> has returned DONE.
     * <p>
     * When creating custom break rules, one is free to define whatever
     * status values may be convenient for the application.
     * <p>
     * @return the status from the break rule that determined the boundary
     * at the current iteration position.
     *
     * @see UWordBreak
     * @stable ICU 2.2
     */
    virtual int32_t getRuleStatus() const;

   /**
    * Get the status (tag) values from the break rule(s) that determined the boundary
    * at the current iteration position.
    * <p>
    * The returned status value(s) are stored into an array provided by the caller.
    * The values are stored in sorted (ascending) order.
    * If the capacity of the output array is insufficient to hold the data,
    *  the output will be truncated to the available length, and a
    *  U_BUFFER_OVERFLOW_ERROR will be signaled.
    *
    * @param fillInVec an array to be filled in with the status values.
    * @param capacity  the length of the supplied vector.  A length of zero causes
    *                  the function to return the number of status values, in the
    *                  normal way, without attempting to store any values.
    * @param status    receives error codes.
    * @return          The number of rule status values from the rules that determined
    *                  the boundary at the current iteration position.
    *                  In the event of a U_BUFFER_OVERFLOW_ERROR, the return value
    *                  is the total number of status values that were available,
    *                  not the reduced number that were actually returned.
    * @see getRuleStatus
    * @stable ICU 3.0
    */
    virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status);

    /**
     * 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;

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

    /**
     * Deprecated functionality. Use clone() instead.
     *
     * Create a clone (copy) of this break iterator in memory provided
     *  by the caller.  The idea is to increase performance by avoiding
     *  a storage allocation.  Use of this function is NOT RECOMMENDED.
     *  Performance gains are minimal, and correct buffer management is
     *  tricky.  Use clone() instead.
     *
     * @param stackBuffer  The pointer to the memory into which the cloned object
     *                     should be placed.  If NULL,  allocate heap memory
     *                     for the cloned object.
     * @param BufferSize   The size of the buffer.  If zero, return the required
     *                     buffer size, but do not clone the object.  If the
     *                     size was too small (but not zero), allocate heap
     *                     storage for the cloned object.
     *
     * @param status       Error status.  U_SAFECLONE_ALLOCATED_WARNING will be
     *                     returned if the provided buffer was too small, and
     *                     the clone was therefore put on the heap.
     *
     * @return  Pointer to the clone object.  This may differ from the stackBuffer
     *          address if the byte alignment of the stack buffer was not suitable
     *          or if the stackBuffer was too small to hold the clone.
     * @deprecated ICU 52. Use clone() instead.
     */
    virtual BreakIterator *  createBufferClone(void *stackBuffer,
                                               int32_t &BufferSize,
                                               UErrorCode &status);


    /**
     * Return the binary form of compiled break rules,
     * which can then be used to create a new break iterator at some
     * time in the future.  Creating a break iterator from pre-compiled rules
     * is much faster than building one from the source form of the
     * break rules.
     *
     * The binary data can only be used with the same version of ICU
     *  and on the same platform type (processor endian-ness)
     *
     * @param length Returns the length of the binary data.  (Out parameter.)
     *
     * @return   A pointer to the binary (compiled) rule data.  The storage
     *           belongs to the RulesBasedBreakIterator object, not the
     *           caller, and must not be modified or deleted.
     * @stable ICU 4.8
     */
    virtual const uint8_t *getBinaryRules(uint32_t &length);

    /**
     *  Set the subject text string upon which the break iterator is operating
     *  without changing any other aspect of the matching state.
     *  The new and previous text strings must have the same content.
     *
     *  This function is intended for use in environments where ICU is operating on
     *  strings that may move around in memory.  It provides a mechanism for notifying
     *  ICU that the string has been relocated, and providing a new UText to access the
     *  string in its new position.
     *
     *  Note that the break iterator implementation never copies the underlying text
     *  of a string being processed, but always operates directly on the original text
     *  provided by the user. Refreshing simply drops the references to the old text
     *  and replaces them with references to the new.
     *
     *  Caution:  this function is normally used only by very specialized,
     *  system-level code.  One example use case is with garbage collection that moves
     *  the text in memory.
     *
     * @param input      The new (moved) text string.
     * @param status     Receives errors detected by this function.
     * @return           *this
     *
     * @stable ICU 49
     */
    virtual RuleBasedBreakIterator &refreshInputText(UText *input, UErrorCode &status);


private:
    //=======================================================================
    // implementation
    //=======================================================================
    /**
     * Dumps caches and performs other actions associated with a complete change
     * in text or iteration position.
     * @internal (private)
     */
    void reset(void);

    /**
      * Common initialization function, used by constructors and bufferClone.
      * @internal (private)
      */
    void init(UErrorCode &status);

    /**
     * Iterate backwards from an arbitrary position in the input text using the
     * synthesized Safe Reverse rules.
     * This locates a "Safe Position" from which the forward break rules
     * will operate correctly. A Safe Position is not necessarily a boundary itself.
     *
     * @param fromPosition the position in the input text to begin the iteration.
     * @internal (private)
     */
    int32_t handleSafePrevious(int32_t fromPosition);

    /**
     * Find a rule-based boundary by running the state machine.
     * Input
     *    fPosition, the position in the text to begin from.
     * Output
     *    fPosition:           the boundary following the starting position.
     *    fDictionaryCharCount the number of dictionary characters encountered.
     *                         If > 0, the segment will be further subdivided
     *    fRuleStatusIndex     Info from the state table indicating which rules caused the boundary.
     *
     * @internal (private)
     */
    int32_t handleNext();


    /**
     * This function returns the appropriate LanguageBreakEngine for a
     * given character c.
     * @param c         A character in the dictionary set
     * @internal (private)
     */
    const LanguageBreakEngine *getLanguageBreakEngine(UChar32 c);

  public:
#ifndef U_HIDE_INTERNAL_API
    /**
     *   Debugging function only.
     *   @internal
     */
     void dumpCache();

    /**
     * Debugging function only.
     * @internal
     */
    void dumpTables();

#endif  /* U_HIDE_INTERNAL_API */
};

//------------------------------------------------------------------------------
//
//   Inline Functions Definitions ...
//
//------------------------------------------------------------------------------

inline UBool RuleBasedBreakIterator::operator!=(const BreakIterator& that) const {
    return !operator==(that);
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_BREAK_ITERATION */

#endif