src/third_party/icu/source/i18n/cpdtrans.h

   1 /*
   2 **********************************************************************
   3 *   Copyright (C) 1999-2011, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 **********************************************************************
   6 *   Date        Name        Description
   7 *   11/17/99    aliu        Creation.
   8 **********************************************************************
   9 */
  10 #ifndef CPDTRANS_H
  11 #define CPDTRANS_H
  12
  13 #include "unicode/utypes.h"
  14
  15 #if !UCONFIG_NO_TRANSLITERATION
  16
  17 #include "unicode/translit.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 class U_COMMON_API UVector;
  22 class TransliteratorRegistry;
  23
  24 /**
  25  * A transliterator that is composed of two or more other
  26  * transliterator objects linked together.  For example, if one
  27  * transliterator transliterates from script A to script B, and
  28  * another transliterates from script B to script C, the two may be
  29  * combined to form a new transliterator from A to C.
  30  *
  31  * <p>Composed transliterators may not behave as expected.  For
  32  * example, inverses may not combine to form the identity
  33  * transliterator.  See the class documentation for {@link
  34  * Transliterator} for details.
  35  *
  36  * @author Alan Liu
  37  */
  38 class U_I18N_API CompoundTransliterator : public Transliterator {
  39
  40     Transliterator** trans;
  41
  42     int32_t count;
  43
  44     int32_t numAnonymousRBTs;
  45
  46 public:
  47
  48     /**
  49      * Constructs a new compound transliterator given an array of
  50      * transliterators.  The array of transliterators may be of any
  51      * length, including zero or one, however, useful compound
  52      * transliterators have at least two components.
  53      * @param transliterators array of <code>Transliterator</code>
  54      * objects
  55      * @param transliteratorCount The number of
  56      * <code>Transliterator</code> objects in transliterators.
  57      * @param adoptedFilter the filter.  Any character for which
  58      * <tt>filter.contains()</tt> returns <tt>false</tt> will not be
  59      * altered by this transliterator.  If <tt>filter</tt> is
  60      * <tt>null</tt> then no filtering is applied.
  61      */
  62     CompoundTransliterator(Transliterator* const transliterators[],
  63                            int32_t transliteratorCount,
  64                            UnicodeFilter* adoptedFilter = 0);
  65
  66     /**
  67      * Constructs a new compound transliterator.
  68      * @param id compound ID
  69      * @param dir either UTRANS_FORWARD or UTRANS_REVERSE
  70      * @param adoptedFilter a global filter for this compound transliterator
  71      * or NULL
  72      */
  73     CompoundTransliterator(const UnicodeString& id,
  74                            UTransDirection dir,
  75                            UnicodeFilter* adoptedFilter,
  76                            UParseError& parseError,
  77                            UErrorCode& status);
  78
  79     /**
  80      * Constructs a new compound transliterator in the FORWARD
  81      * direction with a NULL filter.
  82      */
  83     CompoundTransliterator(const UnicodeString& id,
  84                            UParseError& parseError,
  85                            UErrorCode& status);
  86     /**
  87      * Destructor.
  88      */
  89     virtual ~CompoundTransliterator();
  90
  91     /**
  92      * Copy constructor.
  93      */
  94     CompoundTransliterator(const CompoundTransliterator&);
  95
  96     /**
  97      * Transliterator API.
  98      */
  99     virtual Transliterator* clone(void) const;
 100
 101     /**
 102      * Returns the number of transliterators in this chain.
 103      * @return number of transliterators in this chain.
 104      */
 105     virtual int32_t getCount(void) const;
 106
 107     /**
 108      * Returns the transliterator at the given index in this chain.
 109      * @param idx index into chain, from 0 to <code>getCount() - 1</code>
 110      * @return transliterator at the given index
 111      */
 112     virtual const Transliterator& getTransliterator(int32_t idx) const;
 113
 114     /**
 115      * Sets the transliterators.
 116      */
 117     void setTransliterators(Transliterator* const transliterators[],
 118                             int32_t count);
 119
 120     /**
 121      * Adopts the transliterators.
 122      */
 123     void adoptTransliterators(Transliterator* adoptedTransliterators[],
 124                               int32_t count);
 125
 126     /**
 127      * Override Transliterator:
 128      * Create a rule string that can be passed to createFromRules()
 129      * to recreate this transliterator.
 130      * @param result the string to receive the rules.  Previous
 131      * contents will be deleted.
 132      * @param escapeUnprintable if TRUE then convert unprintable
 133      * character to their hex escape representations, \uxxxx or
 134      * \Uxxxxxxxx.  Unprintable characters are those other than
 135      * U+000A, U+0020..U+007E.
 136      */
 137     virtual UnicodeString& toRules(UnicodeString& result,
 138                                    UBool escapeUnprintable) const;
 139
 140  protected:
 141     /**
 142      * Implement Transliterator framework
 143      */
 144     virtual void handleGetSourceSet(UnicodeSet& result) const;
 145
 146  public:
 147     /**
 148      * Override Transliterator framework
 149      */
 150     virtual UnicodeSet& getTargetSet(UnicodeSet& result) const;
 151
 152 protected:
 153     /**
 154      * Implements {@link Transliterator#handleTransliterate}.
 155      */
 156     virtual void handleTransliterate(Replaceable& text, UTransPosition& idx,
 157                                      UBool incremental) const;
 158
 159 public:
 160
 161     /**
 162      * ICU "poor man's RTTI", returns a UClassID for the actual class.
 163      */
 164     virtual UClassID getDynamicClassID() const;
 165
 166     /**
 167      * ICU "poor man's RTTI", returns a UClassID for this class.
 168      */
 169     static UClassID U_EXPORT2 getStaticClassID();
 170
 171     /* @internal */
 172     static const UChar PASS_STRING[];
 173
 174 private:
 175
 176     friend class Transliterator;
 177     friend class TransliteratorAlias; // to access private ct
 178
 179     /**
 180      * Assignment operator.
 181      */
 182     CompoundTransliterator& operator=(const CompoundTransliterator&);
 183
 184     /**
 185      * Private constructor for Transliterator.
 186      */
 187     CompoundTransliterator(const UnicodeString& ID,
 188                            UVector& list,
 189                            UnicodeFilter* adoptedFilter,
 190                            int32_t numAnonymousRBTs,
 191                            UParseError& parseError,
 192                            UErrorCode& status);
 193
 194     CompoundTransliterator(UVector& list,
 195                            UParseError& parseError,
 196                            UErrorCode& status);
 197
 198     CompoundTransliterator(UVector& list,
 199                            int32_t anonymousRBTs,
 200                            UParseError& parseError,
 201                            UErrorCode& status);
 202
 203     void init(const UnicodeString& id,
 204               UTransDirection direction,
 205               UBool fixReverseID,
 206               UErrorCode& status);
 207
 208     void init(UVector& list,
 209               UTransDirection direction,
 210               UBool fixReverseID,
 211               UErrorCode& status);
 212
 213     /**
 214      * Return the IDs of the given list of transliterators, concatenated
 215      * with ';' delimiting them.  Equivalent to the perlish expression
 216      * join(';', map($_.getID(), transliterators).
 217      */
 218     UnicodeString joinIDs(Transliterator* const transliterators[],
 219                           int32_t transCount);
 220
 221     void freeTransliterators(void);
 222
 223     void computeMaximumContextLength(void);
 224 };
 225
 226 U_NAMESPACE_END
 227
 228 #endif /* #if !UCONFIG_NO_TRANSLITERATION */
 229
 230 #endif