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1 /* | |
2 *************************************************************************** | |
3 * Copyright (C) 1999-2008 International Business Machines Corporation * | |
4 * and others. All rights reserved. * | |
5 *************************************************************************** | |
6 | |
7 ********************************************************************** | |
8 * Date Name Description | |
9 * 10/22/99 alan Creation. | |
10 * 11/11/99 rgillam Complete port from Java. | |
11 ********************************************************************** | |
12 */ | |
13 | |
14 #ifndef RBBI_H | |
15 #define RBBI_H | |
16 | |
17 #include "unicode/utypes.h" | |
18 | |
19 /** | |
20 * \file | |
21 * \brief C++ API: Rule Based Break Iterator | |
22 */ | |
23 | |
24 #if !UCONFIG_NO_BREAK_ITERATION | |
25 | |
26 #include "unicode/brkiter.h" | |
27 #include "unicode/udata.h" | |
28 #include "unicode/parseerr.h" | |
29 #include "unicode/schriter.h" | |
30 #include "unicode/uchriter.h" | |
31 | |
32 | |
33 struct UTrie; | |
34 | |
35 U_NAMESPACE_BEGIN | |
36 | |
37 /** @internal */ | |
38 struct RBBIDataHeader; | |
39 class RuleBasedBreakIteratorTables; | |
40 class BreakIterator; | |
41 class RBBIDataWrapper; | |
42 class UStack; | |
43 class LanguageBreakEngine; | |
44 class UnhandledEngine; | |
45 struct RBBIStateTable; | |
46 | |
47 | |
48 | |
49 | |
50 /** | |
51 * | |
52 * A subclass of BreakIterator whose behavior is specified using a list of rules
. | |
53 * <p>Instances of this class are most commonly created by the factory methods o
f | |
54 * BreakIterator::createWordInstance(), BreakIterator::createLineInstance(), et
c., | |
55 * and then used via the abstract API in class BreakIterator</p> | |
56 * | |
57 * <p>See the ICU User Guide for information on Break Iterator Rules.</p> | |
58 * | |
59 * <p>This class is not intended to be subclassed. (Class DictionaryBasedBreakI
terator | |
60 * is a subclass, but that relationship is effectively internal to the ICU | |
61 * implementation. The subclassing interface to RulesBasedBreakIterator is | |
62 * not part of the ICU API, and may not remain stable.</p> | |
63 * | |
64 */ | |
65 class U_COMMON_API RuleBasedBreakIterator : public BreakIterator { | |
66 | |
67 protected: | |
68 /** | |
69 * The UText through which this BreakIterator accesses the text | |
70 * @internal | |
71 */ | |
72 UText *fText; | |
73 | |
74 /** | |
75 * A character iterator that refers to the same text as the UText, above. | |
76 * Only included for compatibility with old API, which was based on Charac
terIterators. | |
77 * Value may be adopted from outside, or one of fSCharIter or fDCharIter,
below. | |
78 */ | |
79 CharacterIterator *fCharIter; | |
80 | |
81 /** | |
82 * When the input text is provided by a UnicodeString, this will point to | |
83 * a characterIterator that wraps that data. Needed only for the | |
84 * implementation of getText(), a backwards compatibility issue. | |
85 */ | |
86 StringCharacterIterator *fSCharIter; | |
87 | |
88 /** | |
89 * When the input text is provided by a UText, this | |
90 * dummy CharacterIterator over an empty string will | |
91 * be returned from getText() | |
92 */ | |
93 UCharCharacterIterator *fDCharIter; | |
94 | |
95 /** | |
96 * The rule data for this BreakIterator instance | |
97 * @internal | |
98 */ | |
99 RBBIDataWrapper *fData; | |
100 | |
101 /** Index of the Rule {tag} values for the most recent match. | |
102 * @internal | |
103 */ | |
104 int32_t fLastRuleStatusIndex; | |
105 | |
106 /** | |
107 * Rule tag value valid flag. | |
108 * Some iterator operations don't intrinsically set the correct tag value. | |
109 * This flag lets us lazily compute the value if we are ever asked for it. | |
110 * @internal | |
111 */ | |
112 UBool fLastStatusIndexValid; | |
113 | |
114 /** | |
115 * Counter for the number of characters encountered with the "dictionary" | |
116 * flag set. | |
117 * @internal | |
118 */ | |
119 uint32_t fDictionaryCharCount; | |
120 | |
121 /** | |
122 * When a range of characters is divided up using the dictionary, the break | |
123 * positions that are discovered are stored here, preventing us from having | |
124 * to use either the dictionary or the state table again until the iterator | |
125 * leaves this range of text. Has the most impact for line breaking. | |
126 * @internal | |
127 */ | |
128 int32_t* fCachedBreakPositions; | |
129 | |
130 /** | |
131 * The number of elements in fCachedBreakPositions | |
132 * @internal | |
133 */ | |
134 int32_t fNumCachedBreakPositions; | |
135 | |
136 /** | |
137 * if fCachedBreakPositions is not null, this indicates which item in the | |
138 * cache the current iteration position refers to | |
139 * @internal | |
140 */ | |
141 int32_t fPositionInCache; | |
142 | |
143 /** | |
144 * | |
145 * If present, UStack of LanguageBreakEngine objects that might handle | |
146 * dictionary characters. Searched from top to bottom to find an object to | |
147 * handle a given character. | |
148 * @internal | |
149 */ | |
150 UStack *fLanguageBreakEngines; | |
151 | |
152 /** | |
153 * | |
154 * If present, the special LanguageBreakEngine used for handling | |
155 * characters that are in the dictionary set, but not handled by any | |
156 * LangugageBreakEngine. | |
157 * @internal | |
158 */ | |
159 UnhandledEngine *fUnhandledBreakEngine; | |
160 | |
161 /** | |
162 * | |
163 * The type of the break iterator, or -1 if it has not been set. | |
164 * @internal | |
165 */ | |
166 int32_t fBreakType; | |
167 | |
168 protected: | |
169 //======================================================================= | |
170 // constructors | |
171 //======================================================================= | |
172 | |
173 /** | |
174 * Constant to be used in the constructor | |
175 * RuleBasedBreakIterator(RBBIDataHeader*, EDontAdopt, UErrorCode &); | |
176 * which does not adopt the memory indicated by the RBBIDataHeader* | |
177 * parameter. | |
178 * | |
179 * @internal | |
180 */ | |
181 enum EDontAdopt { | |
182 kDontAdopt | |
183 }; | |
184 | |
185 /** | |
186 * Constructor from a flattened set of RBBI data in malloced memory. | |
187 * RulesBasedBreakIterators built from a custom set of rules | |
188 * are created via this constructor; the rules are compiled | |
189 * into memory, then the break iterator is constructed here. | |
190 * | |
191 * The break iterator adopts the memory, and will | |
192 * free it when done. | |
193 * @internal | |
194 */ | |
195 RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status); | |
196 | |
197 /** | |
198 * Constructor from a flattened set of RBBI data in memory which need not | |
199 * be malloced (e.g. it may be a memory-mapped file, etc.). | |
200 * | |
201 * This version does not adopt the memory, and does not | |
202 * free it when done. | |
203 * @internal | |
204 */ | |
205 RuleBasedBreakIterator(const RBBIDataHeader* data, enum EDontAdopt dontAdopt
, UErrorCode &status); | |
206 | |
207 | |
208 friend class RBBIRuleBuilder; | |
209 /** @internal */ | |
210 friend class BreakIterator; | |
211 | |
212 | |
213 | |
214 public: | |
215 | |
216 /** Default constructor. Creates an empty shell of an iterator, with no | |
217 * rules or text to iterate over. Object can subsequently be assigned to. | |
218 * @stable ICU 2.2 | |
219 */ | |
220 RuleBasedBreakIterator(); | |
221 | |
222 /** | |
223 * Copy constructor. Will produce a break iterator with the same behavior, | |
224 * and which iterates over the same text, as the one passed in. | |
225 * @param that The RuleBasedBreakIterator passed to be copied | |
226 * @stable ICU 2.0 | |
227 */ | |
228 RuleBasedBreakIterator(const RuleBasedBreakIterator& that); | |
229 | |
230 /** | |
231 * Construct a RuleBasedBreakIterator from a set of rules supplied as a stri
ng. | |
232 * @param rules The break rules to be used. | |
233 * @param parseError In the event of a syntax error in the rules, provides
the location | |
234 * within the rules of the problem. | |
235 * @param status Information on any errors encountered. | |
236 * @stable ICU 2.2 | |
237 */ | |
238 RuleBasedBreakIterator( const UnicodeString &rules, | |
239 UParseError &parseError, | |
240 UErrorCode &status); | |
241 | |
242 | |
243 /** | |
244 * This constructor uses the udata interface to create a BreakIterator | |
245 * whose internal tables live in a memory-mapped file. "image" is an | |
246 * ICU UDataMemory handle for the pre-compiled break iterator tables. | |
247 * @param image handle to the memory image for the break iterator data. | |
248 * Ownership of the UDataMemory handle passes to the Break Iterator, | |
249 * which will be responsible for closing it when it is no longer need
ed. | |
250 * @param status Information on any errors encountered. | |
251 * @see udata_open | |
252 * @see #getBinaryRules | |
253 * @stable ICU 2.8 | |
254 */ | |
255 RuleBasedBreakIterator(UDataMemory* image, UErrorCode &status); | |
256 | |
257 /** | |
258 * Destructor | |
259 * @stable ICU 2.0 | |
260 */ | |
261 virtual ~RuleBasedBreakIterator(); | |
262 | |
263 /** | |
264 * Assignment operator. Sets this iterator to have the same behavior, | |
265 * and iterate over the same text, as the one passed in. | |
266 * @param that The RuleBasedBreakItertor passed in | |
267 * @return the newly created RuleBasedBreakIterator | |
268 * @stable ICU 2.0 | |
269 */ | |
270 RuleBasedBreakIterator& operator=(const RuleBasedBreakIterator& that); | |
271 | |
272 /** | |
273 * Equality operator. Returns TRUE if both BreakIterators are of the | |
274 * same class, have the same behavior, and iterate over the same text. | |
275 * @param that The BreakIterator to be compared for equality | |
276 * @return TRUE if both BreakIterators are of the | |
277 * same class, have the same behavior, and iterate over the same text. | |
278 * @stable ICU 2.0 | |
279 */ | |
280 virtual UBool operator==(const BreakIterator& that) const; | |
281 | |
282 /** | |
283 * Not-equal operator. If operator== returns TRUE, this returns FALSE, | |
284 * and vice versa. | |
285 * @param that The BreakIterator to be compared for inequality | |
286 * @return TRUE if both BreakIterators are not same. | |
287 * @stable ICU 2.0 | |
288 */ | |
289 UBool operator!=(const BreakIterator& that) const; | |
290 | |
291 /** | |
292 * Returns a newly-constructed RuleBasedBreakIterator with the same | |
293 * behavior, and iterating over the same text, as this one. | |
294 * Differs from the copy constructor in that it is polymorphic, and | |
295 * will correctly clone (copy) a derived class. | |
296 * clone() is thread safe. Multiple threads may simultaeneously | |
297 * clone the same source break iterator. | |
298 * @return a newly-constructed RuleBasedBreakIterator | |
299 * @stable ICU 2.0 | |
300 */ | |
301 virtual BreakIterator* clone() const; | |
302 | |
303 /** | |
304 * Compute a hash code for this BreakIterator | |
305 * @return A hash code | |
306 * @stable ICU 2.0 | |
307 */ | |
308 virtual int32_t hashCode(void) const; | |
309 | |
310 /** | |
311 * Returns the description used to create this iterator | |
312 * @return the description used to create this iterator | |
313 * @stable ICU 2.0 | |
314 */ | |
315 virtual const UnicodeString& getRules(void) const; | |
316 | |
317 //======================================================================= | |
318 // BreakIterator overrides | |
319 //======================================================================= | |
320 | |
321 /** | |
322 * <p> | |
323 * Return a CharacterIterator over the text being analyzed. | |
324 * The returned character iterator is owned by the break iterator, and must | |
325 * not be deleted by the caller. Repeated calls to this function may | |
326 * return the same CharacterIterator. | |
327 * </p> | |
328 * <p> | |
329 * The returned character iterator must not be used concurrently with | |
330 * the break iterator. If concurrent operation is needed, clone the | |
331 * returned character iterator first and operate on the clone. | |
332 * </p> | |
333 * <p> | |
334 * When the break iterator is operating on text supplied via a UText, | |
335 * this function will fail. Lacking any way to signal failures, it | |
336 * returns an CharacterIterator containing no text. | |
337 * The function getUText() provides similar functionality, | |
338 * is reliable, and is more efficient. | |
339 * </p> | |
340 * | |
341 * TODO: deprecate this function? | |
342 * | |
343 * @return An iterator over the text being analyzed. | |
344 * @stable ICU 2.0 | |
345 */ | |
346 virtual CharacterIterator& getText(void) const; | |
347 | |
348 | |
349 /** | |
350 * Get a UText for the text being analyzed. | |
351 * The returned UText is a shallow clone of the UText used internally | |
352 * by the break iterator implementation. It can safely be used to | |
353 * access the text without impacting any break iterator operations, | |
354 * but the underlying text itself must not be altered. | |
355 * | |
356 * @param fillIn A UText to be filled in. If NULL, a new UText will be | |
357 * allocated to hold the result. | |
358 * @param status receives any error codes. | |
359 * @return The current UText for this break iterator. If an input | |
360 * UText was provided, it will always be returned. | |
361 * @stable ICU 3.4 | |
362 */ | |
363 virtual UText *getUText(UText *fillIn, UErrorCode &status) const; | |
364 | |
365 /** | |
366 * Set the iterator to analyze a new piece of text. This function resets | |
367 * the current iteration position to the beginning of the text. | |
368 * @param newText An iterator over the text to analyze. The BreakIterator | |
369 * takes ownership of the character iterator. The caller MUST NOT delete it
! | |
370 * @stable ICU 2.0 | |
371 */ | |
372 virtual void adoptText(CharacterIterator* newText); | |
373 | |
374 /** | |
375 * Set the iterator to analyze a new piece of text. This function resets | |
376 * the current iteration position to the beginning of the text. | |
377 * @param newText The text to analyze. | |
378 * @stable ICU 2.0 | |
379 */ | |
380 virtual void setText(const UnicodeString& newText); | |
381 | |
382 /** | |
383 * Reset the break iterator to operate over the text represented by | |
384 * the UText. The iterator position is reset to the start. | |
385 * | |
386 * This function makes a shallow clone of the supplied UText. This means | |
387 * that the caller is free to immediately close or otherwise reuse the | |
388 * Utext that was passed as a parameter, but that the underlying text itself | |
389 * must not be altered while being referenced by the break iterator. | |
390 * | |
391 * @param text The UText used to change the text. | |
392 * @param status Receives any error codes. | |
393 * @stable ICU 3.4 | |
394 */ | |
395 virtual void setText(UText *text, UErrorCode &status); | |
396 | |
397 /** | |
398 * Sets the current iteration position to the beginning of the text. | |
399 * @return The offset of the beginning of the text. | |
400 * @stable ICU 2.0 | |
401 */ | |
402 virtual int32_t first(void); | |
403 | |
404 /** | |
405 * Sets the current iteration position to the end of the text. | |
406 * @return The text's past-the-end offset. | |
407 * @stable ICU 2.0 | |
408 */ | |
409 virtual int32_t last(void); | |
410 | |
411 /** | |
412 * Advances the iterator either forward or backward the specified number of
steps. | |
413 * Negative values move backward, and positive values move forward. This is | |
414 * equivalent to repeatedly calling next() or previous(). | |
415 * @param n The number of steps to move. The sign indicates the direction | |
416 * (negative is backwards, and positive is forwards). | |
417 * @return The character offset of the boundary position n boundaries away f
rom | |
418 * the current one. | |
419 * @stable ICU 2.0 | |
420 */ | |
421 virtual int32_t next(int32_t n); | |
422 | |
423 /** | |
424 * Advances the iterator to the next boundary position. | |
425 * @return The position of the first boundary after this one. | |
426 * @stable ICU 2.0 | |
427 */ | |
428 virtual int32_t next(void); | |
429 | |
430 /** | |
431 * Moves the iterator backwards, to the last boundary preceding this one. | |
432 * @return The position of the last boundary position preceding this one. | |
433 * @stable ICU 2.0 | |
434 */ | |
435 virtual int32_t previous(void); | |
436 | |
437 /** | |
438 * Sets the iterator to refer to the first boundary position following | |
439 * the specified position. | |
440 * @param offset The position from which to begin searching for a break posi
tion. | |
441 * @return The position of the first break after the current position. | |
442 * @stable ICU 2.0 | |
443 */ | |
444 virtual int32_t following(int32_t offset); | |
445 | |
446 /** | |
447 * Sets the iterator to refer to the last boundary position before the | |
448 * specified position. | |
449 * @param offset The position to begin searching for a break from. | |
450 * @return The position of the last boundary before the starting position. | |
451 * @stable ICU 2.0 | |
452 */ | |
453 virtual int32_t preceding(int32_t offset); | |
454 | |
455 /** | |
456 * Returns true if the specfied position is a boundary position. As a side | |
457 * effect, leaves the iterator pointing to the first boundary position at | |
458 * or after "offset". | |
459 * @param offset the offset to check. | |
460 * @return True if "offset" is a boundary position. | |
461 * @stable ICU 2.0 | |
462 */ | |
463 virtual UBool isBoundary(int32_t offset); | |
464 | |
465 /** | |
466 * Returns the current iteration position. | |
467 * @return The current iteration position. | |
468 * @stable ICU 2.0 | |
469 */ | |
470 virtual int32_t current(void) const; | |
471 | |
472 | |
473 /** | |
474 * Return the status tag from the break rule that determined the most recent
ly | |
475 * returned break position. For break rules that do not specify a | |
476 * status, a default value of 0 is returned. If more than one break rule | |
477 * would cause a boundary to be located at some position in the text, | |
478 * the numerically largest of the applicable status values is returned. | |
479 * <p> | |
480 * Of the standard types of ICU break iterators, only word break and | |
481 * line break provide status values. The values are defined in | |
482 * the header file ubrk.h. For Word breaks, the status allows distinguishin
g between words | |
483 * that contain alphabetic letters, "words" that appear to be numbers, | |
484 * punctuation and spaces, words containing ideographic characters, and | |
485 * more. For Line Break, the status distinguishes between hard (mandatory)
breaks | |
486 * and soft (potential) break positions. | |
487 * <p> | |
488 * <code>getRuleStatus()</code> can be called after obtaining a boundary | |
489 * position from <code>next()</code>, <code>previous()</code>, or | |
490 * any other break iterator functions that returns a boundary position. | |
491 * <p> | |
492 * When creating custom break rules, one is free to define whatever | |
493 * status values may be convenient for the application. | |
494 * <p> | |
495 * Note: this function is not thread safe. It should not have been | |
496 * declared const, and the const remains only for compatibility | |
497 * reasons. (The function is logically const, but not bit-wise const)
. | |
498 * <p> | |
499 * @return the status from the break rule that determined the most recently | |
500 * returned break position. | |
501 * | |
502 * @see UWordBreak | |
503 * @stable ICU 2.2 | |
504 */ | |
505 virtual int32_t getRuleStatus() const; | |
506 | |
507 /** | |
508 * Get the status (tag) values from the break rule(s) that determined the mos
t | |
509 * recently returned break position. | |
510 * <p> | |
511 * The returned status value(s) are stored into an array provided by the call
er. | |
512 * The values are stored in sorted (ascending) order. | |
513 * If the capacity of the output array is insufficient to hold the data, | |
514 * the output will be truncated to the available length, and a | |
515 * U_BUFFER_OVERFLOW_ERROR will be signaled. | |
516 * | |
517 * @param fillInVec an array to be filled in with the status values. | |
518 * @param capacity the length of the supplied vector. A length of zero caus
es | |
519 * the function to return the number of status values, in th
e | |
520 * normal way, without attemtping to store any values. | |
521 * @param status receives error codes. | |
522 * @return The number of rule status values from rules that determin
ed | |
523 * the most recent boundary returned by the break iterator. | |
524 * In the event of a U_BUFFER_OVERFLOW_ERROR, the return val
ue | |
525 * is the total number of status values that were available, | |
526 * not the reduced number that were actually returned. | |
527 * @see getRuleStatus | |
528 * @stable ICU 3.0 | |
529 */ | |
530 virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErro
rCode &status); | |
531 | |
532 /** | |
533 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. | |
534 * This method is to implement a simple version of RTTI, since not all | |
535 * C++ compilers support genuine RTTI. Polymorphic operator==() and | |
536 * clone() methods call this method. | |
537 * | |
538 * @return The class ID for this object. All objects of a | |
539 * given class have the same class ID. Objects of | |
540 * other classes have different class IDs. | |
541 * @stable ICU 2.0 | |
542 */ | |
543 virtual UClassID getDynamicClassID(void) const; | |
544 | |
545 /** | |
546 * Returns the class ID for this class. This is useful only for | |
547 * comparing to a return value from getDynamicClassID(). For example: | |
548 * | |
549 * Base* polymorphic_pointer = createPolymorphicObject(); | |
550 * if (polymorphic_pointer->getDynamicClassID() == | |
551 * Derived::getStaticClassID()) ... | |
552 * | |
553 * @return The class ID for all objects of this class. | |
554 * @stable ICU 2.0 | |
555 */ | |
556 static UClassID U_EXPORT2 getStaticClassID(void); | |
557 | |
558 /* | |
559 * Create a clone (copy) of this break iterator in memory provided | |
560 * by the caller. The idea is to increase performance by avoiding | |
561 * a storage allocation. Use of this functoin is NOT RECOMMENDED. | |
562 * Performance gains are minimal, and correct buffer management is | |
563 * tricky. Use clone() instead. | |
564 * | |
565 * @param stackBuffer The pointer to the memory into which the cloned objec
t | |
566 * should be placed. If NULL, allocate heap memory | |
567 * for the cloned object. | |
568 * @param BufferSize The size of the buffer. If zero, return the required | |
569 * buffer size, but do not clone the object. If the | |
570 * size was too small (but not zero), allocate heap | |
571 * storage for the cloned object. | |
572 * | |
573 * @param status Error status. U_SAFECLONE_ALLOCATED_WARNING will be | |
574 * returned if the the provided buffer was too small, an
d | |
575 * the clone was therefore put on the heap. | |
576 * | |
577 * @return Pointer to the clone object. This may differ from the stackBuff
er | |
578 * address if the byte alignment of the stack buffer was not suitab
le | |
579 * or if the stackBuffer was too small to hold the clone. | |
580 * @stable ICU 2.0 | |
581 */ | |
582 virtual BreakIterator * createBufferClone(void *stackBuffer, | |
583 int32_t &BufferSize, | |
584 UErrorCode &status); | |
585 | |
586 | |
587 /** | |
588 * Return the binary form of compiled break rules, | |
589 * which can then be used to create a new break iterator at some | |
590 * time in the future. Creating a break iterator from pre-compiled rules | |
591 * is much faster than building one from the source form of the | |
592 * break rules. | |
593 * | |
594 * The binary data can only be used with the same version of ICU | |
595 * and on the same platform type (processor endian-ness) | |
596 * | |
597 * @param length Returns the length of the binary data. (Out paramter.) | |
598 * | |
599 * @return A pointer to the binary (compiled) rule data. The storage | |
600 * belongs to the RulesBasedBreakIterator object, not the | |
601 * caller, and must not be modified or deleted. | |
602 * @internal | |
603 */ | |
604 virtual const uint8_t *getBinaryRules(uint32_t &length); | |
605 | |
606 | |
607 protected: | |
608 //======================================================================= | |
609 // implementation | |
610 //======================================================================= | |
611 /** | |
612 * Dumps caches and performs other actions associated with a complete change | |
613 * in text or iteration position. | |
614 * @internal | |
615 */ | |
616 virtual void reset(void); | |
617 | |
618 #if 0 | |
619 /** | |
620 * Return true if the category lookup for this char | |
621 * indicates that it is in the set of dictionary lookup chars. | |
622 * This function is intended for use by dictionary based break iterators. | |
623 * @return true if the category lookup for this char | |
624 * indicates that it is in the set of dictionary lookup chars. | |
625 * @internal | |
626 */ | |
627 virtual UBool isDictionaryChar(UChar32); | |
628 | |
629 /** | |
630 * Get the type of the break iterator. | |
631 * @internal | |
632 */ | |
633 virtual int32_t getBreakType() const; | |
634 #endif | |
635 | |
636 /** | |
637 * Set the type of the break iterator. | |
638 * @internal | |
639 */ | |
640 virtual void setBreakType(int32_t type); | |
641 | |
642 /** | |
643 * Common initialization function, used by constructors and bufferClone. | |
644 * (Also used by DictionaryBasedBreakIterator::createBufferClone().) | |
645 * @internal | |
646 */ | |
647 void init(); | |
648 | |
649 private: | |
650 | |
651 /** | |
652 * This method backs the iterator back up to a "safe position" in the text. | |
653 * This is a position that we know, without any context, must be a break pos
ition. | |
654 * The various calling methods then iterate forward from this safe position
to | |
655 * the appropriate position to return. (For more information, see the descr
iption | |
656 * of buildBackwardsStateTable() in RuleBasedBreakIterator.Builder.) | |
657 * @param statetable state table used of moving backwards | |
658 * @internal | |
659 */ | |
660 int32_t handlePrevious(const RBBIStateTable *statetable); | |
661 | |
662 /** | |
663 * This method is the actual implementation of the next() method. All itera
tion | |
664 * vectors through here. This method initializes the state machine to state
1 | |
665 * and advances through the text character by character until we reach the e
nd | |
666 * of the text or the state machine transitions to state 0. We update our r
eturn | |
667 * value every time the state machine passes through a possible end state. | |
668 * @param statetable state table used of moving forwards | |
669 * @internal | |
670 */ | |
671 int32_t handleNext(const RBBIStateTable *statetable); | |
672 | |
673 protected: | |
674 | |
675 /** | |
676 * This is the function that actually implements dictionary-based | |
677 * breaking. Covering at least the range from startPos to endPos, | |
678 * it checks for dictionary characters, and if it finds them determines | |
679 * the appropriate object to deal with them. It may cache found breaks in | |
680 * fCachedBreakPositions as it goes. It may well also look at text outside | |
681 * the range startPos to endPos. | |
682 * If going forward, endPos is the normal Unicode break result, and | |
683 * if goind in reverse, startPos is the normal Unicode break result | |
684 * @param startPos The start position of a range of text | |
685 * @param endPos The end position of a range of text | |
686 * @param reverse The call is for the reverse direction | |
687 * @internal | |
688 */ | |
689 int32_t checkDictionary(int32_t startPos, int32_t endPos, UBool reverse); | |
690 | |
691 private: | |
692 | |
693 /** | |
694 * This function returns the appropriate LanguageBreakEngine for a | |
695 * given character c. | |
696 * @param c A character in the dictionary set | |
697 * @internal | |
698 */ | |
699 const LanguageBreakEngine *getLanguageBreakEngine(UChar32 c); | |
700 | |
701 /** | |
702 * @internal | |
703 */ | |
704 void makeRuleStatusValid(); | |
705 | |
706 }; | |
707 | |
708 //------------------------------------------------------------------------------ | |
709 // | |
710 // Inline Functions Definitions ... | |
711 // | |
712 //------------------------------------------------------------------------------ | |
713 | |
714 inline UBool RuleBasedBreakIterator::operator!=(const BreakIterator& that) const
{ | |
715 return !operator==(that); | |
716 } | |
717 | |
718 U_NAMESPACE_END | |
719 | |
720 #endif /* #if !UCONFIG_NO_BREAK_ITERATION */ | |
721 | |
722 #endif | |
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