ICU 78.1 78.1

rbbi.h
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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ***************************************************************************
5 * Copyright (C) 1999-2016 International Business Machines Corporation *
6 * and others. All rights reserved. *
7 ***************************************************************************
8
9 **********************************************************************
10 * Date Name Description
11 * 10/22/99 alan Creation.
12 * 11/11/99 rgillam Complete port from Java.
13 **********************************************************************
14 */
15
16 #ifndef RBBI_H
17 #define RBBI_H
18
19 #include "unicode/utypes.h"
20
21 #if U_SHOW_CPLUSPLUS_API
22
28 #if !UCONFIG_NO_BREAK_ITERATION
29
30 #include "unicode/brkiter.h"
31 #include "unicode/udata.h"
32 #include "unicode/parseerr.h"
33 #include "unicode/schriter.h"
34
35 struct UCPTrie;
36
37 U_NAMESPACE_BEGIN
38
40 class LanguageBreakEngine;
41 struct RBBIDataHeader;
42 class RBBIDataWrapper;
43 class UnhandledEngine;
44 class UStack;
45
46
47 #ifndef U_HIDE_INTERNAL_API
60 class ExternalBreakEngine : public UObject {
61 public:
66 virtual ~ExternalBreakEngine() {}
67
77 virtual bool isFor(UChar32 c, const char* locale) const = 0;
78
87 virtual bool handles(UChar32 c) const = 0;
88
102 virtual int32_t fillBreaks(UText* text, int32_t start, int32_t end,
103 int32_t* foundBreaks, int32_t foundBreaksCapacity,
104 UErrorCode& status) const = 0;
105 };
106 #endif /* U_HIDE_INTERNAL_API */
107
108
120 class U_COMMON_API RuleBasedBreakIterator /*final*/ : public BreakIterator {
121
122 private:
126 UText fText = UTEXT_INITIALIZER;
127
128 #ifndef U_HIDE_INTERNAL_API
129 public:
130 #endif /* U_HIDE_INTERNAL_API */
136 RBBIDataWrapper *fData = nullptr;
137
138 private:
143 UErrorCode fErrorCode = U_ZERO_ERROR;
144
149 int32_t fPosition = 0;
150
154 int32_t fRuleStatusIndex = 0;
155
159 class BreakCache;
160 BreakCache *fBreakCache = nullptr;
161
166 class DictionaryCache;
167 DictionaryCache *fDictionaryCache = nullptr;
168
175 UStack *fLanguageBreakEngines = nullptr;
176
183 UnhandledEngine *fUnhandledBreakEngine = nullptr;
184
189 uint32_t fDictionaryCharCount = 0;
190
196 CharacterIterator *fCharIter = &fSCharIter;
197
203 UCharCharacterIterator fSCharIter {u"", 0};
204
208 bool fDone = false;
209
213 int32_t *fLookAheadMatches = nullptr;
214
218 UBool fIsPhraseBreaking = false;
219
220 //=======================================================================
221 // constructors
222 //=======================================================================
223
233 RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status);
234
247 RuleBasedBreakIterator(UDataMemory* image, UBool isPhraseBreaking, UErrorCode &status);
248
249 friend class RBBIRuleBuilder;
250 friend class BreakIterator;
251
257 RuleBasedBreakIterator(UErrorCode *status);
258
259 public:
260
266 RuleBasedBreakIterator();
267
274 RuleBasedBreakIterator(const RuleBasedBreakIterator& that);
275
284 RuleBasedBreakIterator( const UnicodeString &rules,
285 UParseError &parseError,
286 UErrorCode &status);
287
311 RuleBasedBreakIterator(const uint8_t *compiledRules,
312 uint32_t ruleLength,
313 UErrorCode &status);
314
327 RuleBasedBreakIterator(UDataMemory* image, UErrorCode &status);
328
333 virtual ~RuleBasedBreakIterator();
334
342 RuleBasedBreakIterator& operator=(const RuleBasedBreakIterator& that);
343
352 virtual bool operator==(const BreakIterator& that) const override;
353
361 inline bool operator!=(const BreakIterator& that) const {
362 return !operator==(that);
363 }
364
375 virtual RuleBasedBreakIterator* clone() const override;
376
382 virtual int32_t hashCode() const;
383
389 virtual const UnicodeString& getRules() const;
390
391 //=======================================================================
392 // BreakIterator overrides
393 //=======================================================================
394
419 virtual CharacterIterator& getText() const override;
420
435 virtual UText *getUText(UText *fillIn, UErrorCode &status) const override;
436
444 virtual void adoptText(CharacterIterator* newText) override;
445
457 virtual void setText(const UnicodeString& newText) override;
458
472 virtual void setText(UText *text, UErrorCode &status) override;
473
479 virtual int32_t first() override;
480
486 virtual int32_t last() override;
487
498 virtual int32_t next(int32_t n) override;
499
505 virtual int32_t next() override;
506
512 virtual int32_t previous() override;
513
521 virtual int32_t following(int32_t offset) override;
522
530 virtual int32_t preceding(int32_t offset) override;
531
540 virtual UBool isBoundary(int32_t offset) override;
541
550 virtual int32_t current() const override;
551
583 virtual int32_t getRuleStatus() const override;
584
608 virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status) override;
609
621 virtual UClassID getDynamicClassID() const override;
622
634 static UClassID U_EXPORT2 getStaticClassID();
635
636 #ifndef U_FORCE_HIDE_DEPRECATED_API
663 virtual RuleBasedBreakIterator *createBufferClone(void *stackBuffer,
664 int32_t &BufferSize,
665 UErrorCode &status) override;
666 #endif // U_FORCE_HIDE_DEPRECATED_API
667
685 virtual const uint8_t *getBinaryRules(uint32_t &length);
686
712 virtual RuleBasedBreakIterator &refreshInputText(UText *input, UErrorCode &status) override;
713
714
715 private:
716 //=======================================================================
717 // implementation
718 //=======================================================================
727 int32_t handleSafePrevious(int32_t fromPosition);
728
739 int32_t handleNext();
740
741 /*
742 * Templatized version of handleNext() and handleSafePrevious().
743 *
744 * There will be exactly four instantiations, two each for 8 and 16 bit tables,
745 * two each for 8 and 16 bit trie.
746 * Having separate instantiations for the table types keeps conditional tests of
747 * the table type out of the inner loops, at the expense of replicated code.
748 *
749 * The template parameter for the Trie access function is a value, not a type.
750 * Doing it this way, the compiler will inline the Trie function in the
751 * expanded functions. (Both the 8 and 16 bit access functions have the same type
752 * signature)
753 */
754
755 typedef uint16_t (*PTrieFunc)(const UCPTrie *, UChar32);
756
757 template<typename RowType, PTrieFunc trieFunc>
758 int32_t handleSafePrevious(int32_t fromPosition);
759
760 template<typename RowType, PTrieFunc trieFunc>
761 int32_t handleNext();
762
763
770 const LanguageBreakEngine *getLanguageBreakEngine(UChar32 c, const char* locale);
771
772 public:
773 #ifndef U_HIDE_INTERNAL_API
778 void dumpCache();
779
784 void dumpTables();
785 #endif /* U_HIDE_INTERNAL_API */
786
787 #ifndef U_HIDE_INTERNAL_API
797 static void U_EXPORT2 registerExternalBreakEngine(
798 ExternalBreakEngine* toAdopt, UErrorCode& status);
799 #endif /* U_HIDE_INTERNAL_API */
800
801 };
802
803
804 U_NAMESPACE_END
805
806 #endif /* #if !UCONFIG_NO_BREAK_ITERATION */
807
808 #endif /* U_SHOW_CPLUSPLUS_API */
809
810 #endif
brkiter.h
C++ API: Break Iterator.
icu::BreakIterator
The BreakIterator class implements methods for finding the location of boundaries in text.
Definition: brkiter.h:106
icu::BreakIterator::operator==
virtual U_COMMON_API bool operator==(const BreakIterator &) const =0
Return true if another object is semantically equal to this one.
icu::CharacterIterator
Abstract class that defines an API for iteration on text objects.
Definition: chariter.h:361
icu::ExternalBreakEngine
The ExternalBreakEngine class define an abstract interface for the host environment to provide a low ...
Definition: rbbi.h:60
icu::ExternalBreakEngine::isFor
virtual bool isFor(UChar32 c, const char *locale) const =0
icu::ExternalBreakEngine::fillBreaks
virtual int32_t fillBreaks(UText *text, int32_t start, int32_t end, int32_t *foundBreaks, int32_t foundBreaksCapacity, UErrorCode &status) const =0
icu::ExternalBreakEngine::handles
virtual bool handles(UChar32 c) const =0
icu::ExternalBreakEngine::~ExternalBreakEngine
virtual ~ExternalBreakEngine()
destructor
Definition: rbbi.h:66
icu::RuleBasedBreakIterator
A subclass of BreakIterator whose behavior is specified using a list of rules.
Definition: rbbi.h:120
icu::RuleBasedBreakIterator::first
virtual int32_t first() override
Sets the current iteration position to the beginning of the text, position zero.
icu::RuleBasedBreakIterator::hashCode
virtual int32_t hashCode() const
Compute a hash code for this BreakIterator.
icu::RuleBasedBreakIterator::following
virtual int32_t following(int32_t offset) override
Sets the iterator to refer to the first boundary position following the specified position.
icu::RuleBasedBreakIterator::operator==
virtual bool operator==(const BreakIterator &that) const override
Equality operator.
icu::RuleBasedBreakIterator::current
virtual int32_t current() const override
Returns the current iteration position.
icu::RuleBasedBreakIterator::getStaticClassID
static UClassID getStaticClassID()
Returns the class ID for this class.
icu::RuleBasedBreakIterator::refreshInputText
virtual RuleBasedBreakIterator & refreshInputText(UText *input, UErrorCode &status) override
Set the subject text string upon which the break iterator is operating without changing any other asp...
icu::RuleBasedBreakIterator::operator=
RuleBasedBreakIterator & operator=(const RuleBasedBreakIterator &that)
Assignment operator.
icu::RuleBasedBreakIterator::getDynamicClassID
virtual UClassID getDynamicClassID() const override
Returns a unique class ID POLYMORPHICALLY.
icu::RuleBasedBreakIterator::dumpTables
void dumpTables()
Debugging function only.
icu::RuleBasedBreakIterator::next
virtual int32_t next() override
Advances the iterator to the next boundary position.
icu::RuleBasedBreakIterator::getRuleStatus
virtual int32_t getRuleStatus() const override
Return the status tag from the break rule that determined the boundary at the current iteration posit...
icu::RuleBasedBreakIterator::createBufferClone
virtual RuleBasedBreakIterator * createBufferClone(void *stackBuffer, int32_t &BufferSize, UErrorCode &status) override
Deprecated functionality.
icu::RuleBasedBreakIterator::isBoundary
virtual UBool isBoundary(int32_t offset) override
Returns true if the specified position is a boundary position.
icu::RuleBasedBreakIterator::operator!=
bool operator!=(const BreakIterator &that) const
Not-equal operator.
Definition: rbbi.h:361
icu::RuleBasedBreakIterator::clone
virtual RuleBasedBreakIterator * clone() const override
Returns a newly-constructed RuleBasedBreakIterator with the same behavior, and iterating over the sam...
icu::RuleBasedBreakIterator::dumpCache
void dumpCache()
Debugging function only.
icu::RuleBasedBreakIterator::registerExternalBreakEngine
static void registerExternalBreakEngine(ExternalBreakEngine *toAdopt, UErrorCode &status)
Register a new external break engine.
icu::RuleBasedBreakIterator::RuleBasedBreakIterator
RuleBasedBreakIterator()
Default constructor.
icu::RuleBasedBreakIterator::getRuleStatusVec
virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status) override
Get the status (tag) values from the break rule(s) that determined the boundary at the current iterat...
icu::RuleBasedBreakIterator::getBinaryRules
virtual const uint8_t * getBinaryRules(uint32_t &length)
Return the binary form of compiled break rules, which can then be used to create a new break iterator...
icu::RuleBasedBreakIterator::last
virtual int32_t last() override
Sets the current iteration position to the end of the text.
icu::RuleBasedBreakIterator::preceding
virtual int32_t preceding(int32_t offset) override
Sets the iterator to refer to the last boundary position before the specified position.
icu::RuleBasedBreakIterator::RuleBasedBreakIterator
RuleBasedBreakIterator(const RuleBasedBreakIterator &that)
Copy constructor.
icu::RuleBasedBreakIterator::adoptText
virtual void adoptText(CharacterIterator *newText) override
Set the iterator to analyze a new piece of text.
icu::RuleBasedBreakIterator::getUText
virtual UText * getUText(UText *fillIn, UErrorCode &status) const override
Get a UText for the text being analyzed.
icu::RuleBasedBreakIterator::previous
virtual int32_t previous() override
Moves the iterator backwards, to the last boundary preceding this one.
icu::RuleBasedBreakIterator::RuleBasedBreakIterator
RuleBasedBreakIterator(UDataMemory *image, UErrorCode &status)
This constructor uses the udata interface to create a BreakIterator whose internal tables live in a m...
icu::RuleBasedBreakIterator::next
virtual int32_t next(int32_t n) override
Advances the iterator either forward or backward the specified number of steps.
icu::RuleBasedBreakIterator::getText
virtual CharacterIterator & getText() const override
icu::RuleBasedBreakIterator::getRules
virtual const UnicodeString & getRules() const
Returns the description used to create this iterator.
icu::RuleBasedBreakIterator::setText
virtual void setText(UText *text, UErrorCode &status) override
Reset the break iterator to operate over the text represented by the UText.
icu::RuleBasedBreakIterator::~RuleBasedBreakIterator
virtual ~RuleBasedBreakIterator()
Destructor.
icu::RuleBasedBreakIterator::RuleBasedBreakIterator
RuleBasedBreakIterator(const UnicodeString &rules, UParseError &parseError, UErrorCode &status)
Construct a RuleBasedBreakIterator from a set of rules supplied as a string.
icu::RuleBasedBreakIterator::RuleBasedBreakIterator
RuleBasedBreakIterator(const uint8_t *compiledRules, uint32_t ruleLength, UErrorCode &status)
Construct a RuleBasedBreakIterator from a set of precompiled binary rules.
icu::RuleBasedBreakIterator::setText
virtual void setText(const UnicodeString &newText) override
Set the iterator to analyze a new piece of text.
icu::UCharCharacterIterator
A concrete subclass of CharacterIterator that iterates over the characters (code units or code points...
Definition: uchriter.h:38
icu::UObject
UObject is the common ICU "boilerplate" class.
Definition: uobject.h:222
icu::UnicodeString
UnicodeString is a string class that stores Unicode characters directly and provides similar function...
Definition: unistr.h:303
parseerr.h
C API: Parse Error Information.
schriter.h
C++ API: String Character Iterator.
UCPTrie
Immutable Unicode code point trie structure.
Definition: ucptrie.h:59
UParseError
A UParseError struct is used to returned detailed information about parsing errors.
Definition: parseerr.h:58
UText
UText struct.
Definition: utext.h:1328
udata.h
C API: Data loading interface.
UDataMemory
struct UDataMemory UDataMemory
Forward declaration of the data memory type.
Definition: udata.h:161
UChar32
int32_t UChar32
Define UChar32 as a type for single Unicode code points.
Definition: umachine.h:449
UBool
int8_t UBool
The ICU boolean type, a signed-byte integer.
Definition: umachine.h:269
UClassID
void * UClassID
UClassID is used to identify classes without using the compiler's RTTI.
Definition: uobject.h:96
UTEXT_INITIALIZER
#define UTEXT_INITIALIZER
initializer to be used with local (stack) instances of a UText struct.
Definition: utext.h:1558
utypes.h
Basic definitions for ICU, for both C and C++ APIs.
UErrorCode
UErrorCode
Standard ICU4C error code type, a substitute for exceptions.
Definition: utypes.h:509
U_ZERO_ERROR
@ U_ZERO_ERROR
No error, no warning.
Definition: utypes.h:544
U_COMMON_API
#define U_COMMON_API
Set to export library symbols from inside the common library, and to import them from outside.
Definition: utypes.h:315