ICU 70.1  70.1
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 
58 
59 private:
64  UText fText;
65 
66 #ifndef U_HIDE_INTERNAL_API
67 public:
68 #endif /* U_HIDE_INTERNAL_API */
74  RBBIDataWrapper *fData;
75 private:
76 
81  int32_t fPosition;
82 
86  int32_t fRuleStatusIndex;
87 
91  class BreakCache;
92  BreakCache *fBreakCache;
93 
98  class DictionaryCache;
99  DictionaryCache *fDictionaryCache;
100 
108  UStack *fLanguageBreakEngines;
109 
117  UnhandledEngine *fUnhandledBreakEngine;
118 
124  uint32_t fDictionaryCharCount;
125 
131  CharacterIterator *fCharIter;
132 
138  StringCharacterIterator fSCharIter;
139 
143  UBool fDone;
144 
148  int32_t *fLookAheadMatches;
149 
150  //=======================================================================
151  // constructors
152  //=======================================================================
153 
164  RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status);
165 
167  friend class RBBIRuleBuilder;
169  friend class BreakIterator;
170 
171 public:
172 
178 
186 
196  UParseError &parseError,
197  UErrorCode &status);
198 
222  RuleBasedBreakIterator(const uint8_t *compiledRules,
223  uint32_t ruleLength,
224  UErrorCode &status);
225 
239 
245 
254 
263  virtual bool operator==(const BreakIterator& that) const override;
264 
272  inline bool operator!=(const BreakIterator& that) const;
273 
284  virtual RuleBasedBreakIterator* clone() const override;
285 
291  virtual int32_t hashCode(void) const;
292 
298  virtual const UnicodeString& getRules(void) const;
299 
300  //=======================================================================
301  // BreakIterator overrides
302  //=======================================================================
303 
329  virtual CharacterIterator& getText(void) const override;
330 
331 
346  virtual UText *getUText(UText *fillIn, UErrorCode &status) const override;
347 
355  virtual void adoptText(CharacterIterator* newText) override;
356 
368  virtual void setText(const UnicodeString& newText) override;
369 
383  virtual void setText(UText *text, UErrorCode &status) override;
384 
390  virtual int32_t first(void) override;
391 
397  virtual int32_t last(void) override;
398 
409  virtual int32_t next(int32_t n) override;
410 
416  virtual int32_t next(void) override;
417 
423  virtual int32_t previous(void) override;
424 
432  virtual int32_t following(int32_t offset) override;
433 
441  virtual int32_t preceding(int32_t offset) override;
442 
451  virtual UBool isBoundary(int32_t offset) override;
452 
461  virtual int32_t current(void) const override;
462 
463 
495  virtual int32_t getRuleStatus() const override;
496 
520  virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status) override;
521 
533  virtual UClassID getDynamicClassID(void) const override;
534 
546  static UClassID U_EXPORT2 getStaticClassID(void);
547 
548 #ifndef U_FORCE_HIDE_DEPRECATED_API
575  virtual RuleBasedBreakIterator *createBufferClone(void *stackBuffer,
576  int32_t &BufferSize,
577  UErrorCode &status) override;
578 #endif // U_FORCE_HIDE_DEPRECATED_API
579 
597  virtual const uint8_t *getBinaryRules(uint32_t &length);
598 
624  virtual RuleBasedBreakIterator &refreshInputText(UText *input, UErrorCode &status) override;
625 
626 
627 private:
628  //=======================================================================
629  // implementation
630  //=======================================================================
636  void reset(void);
637 
642  void init(UErrorCode &status);
643 
653  int32_t handleSafePrevious(int32_t fromPosition);
654 
667  int32_t handleNext();
668 
669  /*
670  * Templatized version of handleNext() and handleSafePrevious().
671  *
672  * There will be exactly four instantiations, two each for 8 and 16 bit tables,
673  * two each for 8 and 16 bit trie.
674  * Having separate instantiations for the table types keeps conditional tests of
675  * the table type out of the inner loops, at the expense of replicated code.
676  *
677  * The template parameter for the Trie access function is a value, not a type.
678  * Doing it this way, the compiler will inline the Trie function in the
679  * expanded functions. (Both the 8 and 16 bit access functions have the same type
680  * signature)
681  */
682 
683  typedef uint16_t (*PTrieFunc)(const UCPTrie *, UChar32);
684 
685  template<typename RowType, PTrieFunc trieFunc>
686  int32_t handleSafePrevious(int32_t fromPosition);
687 
688  template<typename RowType, PTrieFunc trieFunc>
689  int32_t handleNext();
690 
691 
698  const LanguageBreakEngine *getLanguageBreakEngine(UChar32 c);
699 
700  public:
701 #ifndef U_HIDE_INTERNAL_API
706  void dumpCache();
707 
712  void dumpTables();
713 #endif /* U_HIDE_INTERNAL_API */
714 };
715 
716 //------------------------------------------------------------------------------
717 //
718 // Inline Functions Definitions ...
719 //
720 //------------------------------------------------------------------------------
721 
722 inline bool RuleBasedBreakIterator::operator!=(const BreakIterator& that) const {
723  return !operator==(that);
724 }
725 
726 U_NAMESPACE_END
727 
728 #endif /* #if !UCONFIG_NO_BREAK_ITERATION */
729 
730 #endif /* U_SHOW_CPLUSPLUS_API */
731 
732 #endif
C++ API: Break Iterator.
The BreakIterator class implements methods for finding the location of boundaries in text.
Definition: brkiter.h:106
bool operator!=(const BreakIterator &rhs) const
Returns the complement of the result of operator==.
Definition: brkiter.h:135
Abstract class that defines an API for iteration on text objects.
Definition: chariter.h:361
A subclass of BreakIterator whose behavior is specified using a list of rules.
Definition: rbbi.h:57
virtual int32_t current(void) const override
Returns the current iteration position.
virtual int32_t following(int32_t offset) override
Sets the iterator to refer to the first boundary position following the specified position.
virtual bool operator==(const BreakIterator &that) const override
Equality operator.
RBBIDataWrapper * fData
The rule data for this BreakIterator instance.
Definition: rbbi.h:74
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...
RuleBasedBreakIterator & operator=(const RuleBasedBreakIterator &that)
Assignment operator.
void dumpTables()
Debugging function only.
virtual UClassID getDynamicClassID(void) const override
Returns a unique class ID POLYMORPHICALLY.
virtual int32_t last(void) override
Sets the current iteration position to the end of the text.
virtual int32_t getRuleStatus() const override
Return the status tag from the break rule that determined the boundary at the current iteration posit...
virtual RuleBasedBreakIterator * createBufferClone(void *stackBuffer, int32_t &BufferSize, UErrorCode &status) override
Deprecated functionality.
virtual UBool isBoundary(int32_t offset) override
Returns true if the specified position is a boundary position.
virtual RuleBasedBreakIterator * clone() const override
Returns a newly-constructed RuleBasedBreakIterator with the same behavior, and iterating over the sam...
void dumpCache()
Debugging function only.
RuleBasedBreakIterator()
Default constructor.
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...
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...
virtual int32_t first(void) override
Sets the current iteration position to the beginning of the text, position zero.
static UClassID getStaticClassID(void)
Returns the class ID for this class.
virtual int32_t preceding(int32_t offset) override
Sets the iterator to refer to the last boundary position before the specified position.
RuleBasedBreakIterator(const RuleBasedBreakIterator &that)
Copy constructor.
virtual int32_t previous(void) override
Moves the iterator backwards, to the last boundary preceding this one.
virtual void adoptText(CharacterIterator *newText) override
Set the iterator to analyze a new piece of text.
virtual UText * getUText(UText *fillIn, UErrorCode &status) const override
Get a UText for the text being analyzed.
virtual const UnicodeString & getRules(void) const
Returns the description used to create this iterator.
RuleBasedBreakIterator(UDataMemory *image, UErrorCode &status)
This constructor uses the udata interface to create a BreakIterator whose internal tables live in a m...
virtual int32_t next(int32_t n) override
Advances the iterator either forward or backward the specified number of steps.
virtual void setText(UText *text, UErrorCode &status) override
Reset the break iterator to operate over the text represented by the UText.
virtual ~RuleBasedBreakIterator()
Destructor.
RuleBasedBreakIterator(const UnicodeString &rules, UParseError &parseError, UErrorCode &status)
Construct a RuleBasedBreakIterator from a set of rules supplied as a string.
virtual CharacterIterator & getText(void) const override
virtual int32_t hashCode(void) const
Compute a hash code for this BreakIterator.
virtual int32_t next(void) override
Advances the iterator to the next boundary position.
RuleBasedBreakIterator(const uint8_t *compiledRules, uint32_t ruleLength, UErrorCode &status)
Construct a RuleBasedBreakIterator from a set of precompiled binary rules.
virtual void setText(const UnicodeString &newText) override
Set the iterator to analyze a new piece of text.
A concrete subclass of CharacterIterator that iterates over the characters (code units or code points...
Definition: schriter.h:48
UnicodeString is a string class that stores Unicode characters directly and provides similar function...
Definition: unistr.h:296
U_EXPORT UBool operator==(const StringPiece &x, const StringPiece &y)
Global operator == for StringPiece.
bool operator!=(const StringPiece &x, const StringPiece &y)
Global operator != for StringPiece.
Definition: stringpiece.h:335
C API: Parse Error Information.
C++ API: String Character Iterator.
Immutable Unicode code point trie structure.
Definition: ucptrie.h:60
A UParseError struct is used to returned detailed information about parsing errors.
Definition: parseerr.h:58
UText struct.
Definition: utext.h:1328
C API: Data loading interface.
struct UDataMemory UDataMemory
Forward declaration of the data memory type.
Definition: udata.h:161
int32_t UChar32
Define UChar32 as a type for single Unicode code points.
Definition: umachine.h:467
int8_t UBool
The ICU boolean type, a signed-byte integer.
Definition: umachine.h:269
void * UClassID
UClassID is used to identify classes without using the compiler's RTTI.
Definition: uobject.h:96
Basic definitions for ICU, for both C and C++ APIs.
UErrorCode
Standard ICU4C error code type, a substitute for exceptions.
Definition: utypes.h:415
#define U_COMMON_API
Set to export library symbols from inside the common library, and to import them from outside.
Definition: utypes.h:300