icuSources/common/dictbe.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /**
   4  *******************************************************************************
   5  * Copyright (C) 2006-2014, International Business Machines Corporation   *
   6  * and others. All Rights Reserved.                                            *
   7  *******************************************************************************
   8  */
   9
  10 #ifndef DICTBE_H
  11 #define DICTBE_H
  12
  13 #include "unicode/utypes.h"
  14 #include "unicode/uniset.h"
  15 #include "unicode/utext.h"
  16
  17 #include "brkeng.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 class DictionaryMatcher;
  22 class Normalizer2;
  23
  24 /*******************************************************************
  25  * DictionaryBreakEngine
  26  */
  27
  28 /**
  29  * <p>DictionaryBreakEngine is a kind of LanguageBreakEngine that uses a
  30  * dictionary to determine language-specific breaks.</p>
  31  *
  32  * <p>After it is constructed a DictionaryBreakEngine may be shared between
  33  * threads without synchronization.</p>
  34  */
  35 class DictionaryBreakEngine : public LanguageBreakEngine {
  36  private:
  37     /**
  38      * The set of characters handled by this engine
  39      * @internal
  40      */
  41
  42   UnicodeSet    fSet;
  43
  44     /**
  45      * The set of break types handled by this engine
  46      * @internal
  47      */
  48
  49   uint32_t      fTypes;
  50
  51   /**
  52    * <p>Default constructor.</p>
  53    *
  54    */
  55   DictionaryBreakEngine();
  56
  57  public:
  58
  59   /**
  60    * <p>Constructor setting the break types handled.</p>
  61    *
  62    * @param breakTypes A bitmap of types handled by the engine.
  63    */
  64   DictionaryBreakEngine( uint32_t breakTypes );
  65
  66   /**
  67    * <p>Virtual destructor.</p>
  68    */
  69   virtual ~DictionaryBreakEngine();
  70
  71   /**
  72    * <p>Indicate whether this engine handles a particular character for
  73    * a particular kind of break.</p>
  74    *
  75    * @param c A character which begins a run that the engine might handle
  76    * @param breakType The type of text break which the caller wants to determine
  77    * @return TRUE if this engine handles the particular character and break
  78    * type.
  79    */
  80   virtual UBool handles( UChar32 c, int32_t breakType ) const;
  81
  82   /**
  83    * <p>Find any breaks within a run in the supplied text.</p>
  84    *
  85    * @param text A UText representing the text. The iterator is left at
  86    * the end of the run of characters which the engine is capable of handling
  87    * that starts from the first (or last) character in the range.
  88    * @param startPos The start of the run within the supplied text.
  89    * @param endPos The end of the run within the supplied text.
  90    * @param reverse Whether the caller is looking for breaks in a reverse
  91    * direction.
  92    * @param breakType The type of break desired, or -1.
  93    * @param foundBreaks An allocated C array of the breaks found, if any
  94    * @return The number of breaks found.
  95    */
  96   virtual int32_t findBreaks( UText *text,
  97                               int32_t startPos,
  98                               int32_t endPos,
  99                               UBool reverse,
 100                               int32_t breakType,
 101                               UStack &foundBreaks ) const;
 102
 103  protected:
 104
 105  /**
 106   * <p>Set the character set handled by this engine.</p>
 107   *
 108   * @param set A UnicodeSet of the set of characters handled by the engine
 109   */
 110   virtual void setCharacters( const UnicodeSet &set );
 111
 112  /**
 113   * <p>Set the break types handled by this engine.</p>
 114   *
 115   * @param breakTypes A bitmap of types handled by the engine.
 116   */
 117 //  virtual void setBreakTypes( uint32_t breakTypes );
 118
 119  /**
 120   * <p>Divide up a range of known dictionary characters handled by this break engine.</p>
 121   *
 122   * @param text A UText representing the text
 123   * @param rangeStart The start of the range of dictionary characters
 124   * @param rangeEnd The end of the range of dictionary characters
 125   * @param foundBreaks Output of C array of int32_t break positions, or 0
 126   * @return The number of breaks found
 127   */
 128   virtual int32_t divideUpDictionaryRange( UText *text,
 129                                            int32_t rangeStart,
 130                                            int32_t rangeEnd,
 131                                            UStack &foundBreaks ) const = 0;
 132
 133 };
 134
 135 /*******************************************************************
 136  * ThaiBreakEngine
 137  */
 138
 139 /**
 140  * <p>ThaiBreakEngine is a kind of DictionaryBreakEngine that uses a
 141  * dictionary and heuristics to determine Thai-specific breaks.</p>
 142  *
 143  * <p>After it is constructed a ThaiBreakEngine may be shared between
 144  * threads without synchronization.</p>
 145  */
 146 class ThaiBreakEngine : public DictionaryBreakEngine {
 147  private:
 148     /**
 149      * The set of characters handled by this engine
 150      * @internal
 151      */
 152
 153   UnicodeSet                fThaiWordSet;
 154   UnicodeSet                fEndWordSet;
 155   UnicodeSet                fBeginWordSet;
 156   UnicodeSet                fSuffixSet;
 157   UnicodeSet                fMarkSet;
 158   DictionaryMatcher  *fDictionary;
 159
 160  public:
 161
 162   /**
 163    * <p>Default constructor.</p>
 164    *
 165    * @param adoptDictionary A DictionaryMatcher to adopt. Deleted when the
 166    * engine is deleted.
 167    */
 168   ThaiBreakEngine(DictionaryMatcher *adoptDictionary, UErrorCode &status);
 169
 170   /**
 171    * <p>Virtual destructor.</p>
 172    */
 173   virtual ~ThaiBreakEngine();
 174
 175  protected:
 176  /**
 177   * <p>Divide up a range of known dictionary characters handled by this break engine.</p>
 178   *
 179   * @param text A UText representing the text
 180   * @param rangeStart The start of the range of dictionary characters
 181   * @param rangeEnd The end of the range of dictionary characters
 182   * @param foundBreaks Output of C array of int32_t break positions, or 0
 183   * @return The number of breaks found
 184   */
 185   virtual int32_t divideUpDictionaryRange( UText *text,
 186                                            int32_t rangeStart,
 187                                            int32_t rangeEnd,
 188                                            UStack &foundBreaks ) const;
 189
 190 };
 191
 192 /*******************************************************************
 193  * LaoBreakEngine
 194  */
 195
 196 /**
 197  * <p>LaoBreakEngine is a kind of DictionaryBreakEngine that uses a
 198  * dictionary and heuristics to determine Lao-specific breaks.</p>
 199  *
 200  * <p>After it is constructed a LaoBreakEngine may be shared between
 201  * threads without synchronization.</p>
 202  */
 203 class LaoBreakEngine : public DictionaryBreakEngine {
 204  private:
 205     /**
 206      * The set of characters handled by this engine
 207      * @internal
 208      */
 209
 210   UnicodeSet                fLaoWordSet;
 211   UnicodeSet                fEndWordSet;
 212   UnicodeSet                fBeginWordSet;
 213   UnicodeSet                fMarkSet;
 214   DictionaryMatcher  *fDictionary;
 215
 216  public:
 217
 218   /**
 219    * <p>Default constructor.</p>
 220    *
 221    * @param adoptDictionary A DictionaryMatcher to adopt. Deleted when the
 222    * engine is deleted.
 223    */
 224   LaoBreakEngine(DictionaryMatcher *adoptDictionary, UErrorCode &status);
 225
 226   /**
 227    * <p>Virtual destructor.</p>
 228    */
 229   virtual ~LaoBreakEngine();
 230
 231  protected:
 232  /**
 233   * <p>Divide up a range of known dictionary characters handled by this break engine.</p>
 234   *
 235   * @param text A UText representing the text
 236   * @param rangeStart The start of the range of dictionary characters
 237   * @param rangeEnd The end of the range of dictionary characters
 238   * @param foundBreaks Output of C array of int32_t break positions, or 0
 239   * @return The number of breaks found
 240   */
 241   virtual int32_t divideUpDictionaryRange( UText *text,
 242                                            int32_t rangeStart,
 243                                            int32_t rangeEnd,
 244                                            UStack &foundBreaks ) const;
 245
 246 };
 247
 248 /*******************************************************************
 249  * BurmeseBreakEngine
 250  */
 251
 252 /**
 253  * <p>BurmeseBreakEngine is a kind of DictionaryBreakEngine that uses a
 254  * DictionaryMatcher and heuristics to determine Burmese-specific breaks.</p>
 255  *
 256  * <p>After it is constructed a BurmeseBreakEngine may be shared between
 257  * threads without synchronization.</p>
 258  */
 259 class BurmeseBreakEngine : public DictionaryBreakEngine {
 260  private:
 261     /**
 262      * The set of characters handled by this engine
 263      * @internal
 264      */
 265
 266   UnicodeSet                fBurmeseWordSet;
 267   UnicodeSet                fEndWordSet;
 268   UnicodeSet                fBeginWordSet;
 269   UnicodeSet                fMarkSet;
 270   DictionaryMatcher  *fDictionary;
 271
 272  public:
 273
 274   /**
 275    * <p>Default constructor.</p>
 276    *
 277    * @param adoptDictionary A DictionaryMatcher to adopt. Deleted when the
 278    * engine is deleted.
 279    */
 280   BurmeseBreakEngine(DictionaryMatcher *adoptDictionary, UErrorCode &status);
 281
 282   /**
 283    * <p>Virtual destructor.</p>
 284    */
 285   virtual ~BurmeseBreakEngine();
 286
 287  protected:
 288  /**
 289   * <p>Divide up a range of known dictionary characters.</p>
 290   *
 291   * @param text A UText representing the text
 292   * @param rangeStart The start of the range of dictionary characters
 293   * @param rangeEnd The end of the range of dictionary characters
 294   * @param foundBreaks Output of C array of int32_t break positions, or 0
 295   * @return The number of breaks found
 296   */
 297   virtual int32_t divideUpDictionaryRange( UText *text,
 298                                            int32_t rangeStart,
 299                                            int32_t rangeEnd,
 300                                            UStack &foundBreaks ) const;
 301
 302 };
 303
 304 /*******************************************************************
 305  * KhmerBreakEngine
 306  */
 307
 308 /**
 309  * <p>KhmerBreakEngine is a kind of DictionaryBreakEngine that uses a
 310  * DictionaryMatcher and heuristics to determine Khmer-specific breaks.</p>
 311  *
 312  * <p>After it is constructed a KhmerBreakEngine may be shared between
 313  * threads without synchronization.</p>
 314  */
 315 class KhmerBreakEngine : public DictionaryBreakEngine {
 316  private:
 317     /**
 318      * The set of characters handled by this engine
 319      * @internal
 320      */
 321
 322   UnicodeSet                fKhmerWordSet;
 323   UnicodeSet                fEndWordSet;
 324   UnicodeSet                fBeginWordSet;
 325   UnicodeSet                fMarkSet;
 326   DictionaryMatcher  *fDictionary;
 327
 328  public:
 329
 330   /**
 331    * <p>Default constructor.</p>
 332    *
 333    * @param adoptDictionary A DictionaryMatcher to adopt. Deleted when the
 334    * engine is deleted.
 335    */
 336   KhmerBreakEngine(DictionaryMatcher *adoptDictionary, UErrorCode &status);
 337
 338   /**
 339    * <p>Virtual destructor.</p>
 340    */
 341   virtual ~KhmerBreakEngine();
 342
 343  protected:
 344  /**
 345   * <p>Divide up a range of known dictionary characters.</p>
 346   *
 347   * @param text A UText representing the text
 348   * @param rangeStart The start of the range of dictionary characters
 349   * @param rangeEnd The end of the range of dictionary characters
 350   * @param foundBreaks Output of C array of int32_t break positions, or 0
 351   * @return The number of breaks found
 352   */
 353   virtual int32_t divideUpDictionaryRange( UText *text,
 354                                            int32_t rangeStart,
 355                                            int32_t rangeEnd,
 356                                            UStack &foundBreaks ) const;
 357
 358 };
 359
 360 #if !UCONFIG_NO_NORMALIZATION
 361
 362 /*******************************************************************
 363  * CjkBreakEngine
 364  */
 365
 366 //indicates language/script that the CjkBreakEngine will handle
 367 enum LanguageType {
 368     kKorean,
 369     kChineseJapanese
 370 };
 371
 372 /**
 373  * <p>CjkBreakEngine is a kind of DictionaryBreakEngine that uses a
 374  * dictionary with costs associated with each word and
 375  * Viterbi decoding to determine CJK-specific breaks.</p>
 376  */
 377 class CjkBreakEngine : public DictionaryBreakEngine {
 378  protected:
 379     /**
 380      * The set of characters handled by this engine
 381      * @internal
 382      */
 383   UnicodeSet                fHangulWordSet;
 384   UnicodeSet                fHanWordSet;
 385   UnicodeSet                fKatakanaWordSet;
 386   UnicodeSet                fHiraganaWordSet;
 387
 388   DictionaryMatcher        *fDictionary;
 389   const Normalizer2        *nfkcNorm2;
 390
 391  public:
 392
 393     /**
 394      * <p>Default constructor.</p>
 395      *
 396      * @param adoptDictionary A DictionaryMatcher to adopt. Deleted when the
 397      * engine is deleted. The DictionaryMatcher must contain costs for each word
 398      * in order for the dictionary to work properly.
 399      */
 400   CjkBreakEngine(DictionaryMatcher *adoptDictionary, LanguageType type, UErrorCode &status);
 401
 402     /**
 403      * <p>Virtual destructor.</p>
 404      */
 405   virtual ~CjkBreakEngine();
 406
 407  protected:
 408     /**
 409      * <p>Divide up a range of known dictionary characters handled by this break engine.</p>
 410      *
 411      * @param text A UText representing the text
 412      * @param rangeStart The start of the range of dictionary characters
 413      * @param rangeEnd The end of the range of dictionary characters
 414      * @param foundBreaks Output of C array of int32_t break positions, or 0
 415      * @return The number of breaks found
 416      */
 417   virtual int32_t divideUpDictionaryRange( UText *text,
 418           int32_t rangeStart,
 419           int32_t rangeEnd,
 420           UStack &foundBreaks ) const;
 421
 422 };
 423
 424 #endif
 425
 426 U_NAMESPACE_END
 427
 428     /* DICTBE_H */
 429 #endif