icuSources/common/unicode/caniter.h

   1 /*
   2  *******************************************************************************
   3  * Copyright (C) 1996-2010, International Business Machines Corporation and    *
   4  * others. All Rights Reserved.                                                *
   5  *******************************************************************************
   6  */
   7
   8 #ifndef CANITER_H
   9 #define CANITER_H
  10
  11 #include "unicode/utypes.h"
  12
  13 #if !UCONFIG_NO_NORMALIZATION
  14
  15 #include "unicode/uobject.h"
  16 #include "unicode/unistr.h"
  17
  18 /**
  19  * \file
  20  * \brief C++ API: Canonical Iterator
  21  */
  22
  23 /** Should permutation skip characters with combining class zero
  24  *  Should be either TRUE or FALSE. This is a compile time option
  25  *  @stable ICU 2.4
  26  */
  27 #ifndef CANITER_SKIP_ZEROES
  28 #define CANITER_SKIP_ZEROES TRUE
  29 #endif
  30
  31 U_NAMESPACE_BEGIN
  32
  33 class Hashtable;
  34 class Normalizer2;
  35 class Normalizer2Impl;
  36
  37 /**
  38  * This class allows one to iterate through all the strings that are canonically equivalent to a given
  39  * string. For example, here are some sample results:
  40 Results for: {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
  41 1: \\u0041\\u030A\\u0064\\u0307\\u0327
  42  = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
  43 2: \\u0041\\u030A\\u0064\\u0327\\u0307
  44  = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
  45 3: \\u0041\\u030A\\u1E0B\\u0327
  46  = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
  47 4: \\u0041\\u030A\\u1E11\\u0307
  48  = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
  49 5: \\u00C5\\u0064\\u0307\\u0327
  50  = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
  51 6: \\u00C5\\u0064\\u0327\\u0307
  52  = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
  53 7: \\u00C5\\u1E0B\\u0327
  54  = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
  55 8: \\u00C5\\u1E11\\u0307
  56  = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
  57 9: \\u212B\\u0064\\u0307\\u0327
  58  = {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
  59 10: \\u212B\\u0064\\u0327\\u0307
  60  = {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
  61 11: \\u212B\\u1E0B\\u0327
  62  = {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
  63 12: \\u212B\\u1E11\\u0307
  64  = {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
  65  *<br>Note: the code is intended for use with small strings, and is not suitable for larger ones,
  66  * since it has not been optimized for that situation.
  67  * Note, CanonicalIterator is not intended to be subclassed.
  68  * @author M. Davis
  69  * @author C++ port by V. Weinstein
  70  * @stable ICU 2.4
  71  */
  72 class U_COMMON_API CanonicalIterator : public UObject {
  73 public:
  74     /**
  75      * Construct a CanonicalIterator object
  76      * @param source    string to get results for
  77      * @param status    Fill-in parameter which receives the status of this operation.
  78      * @stable ICU 2.4
  79      */
  80     CanonicalIterator(const UnicodeString &source, UErrorCode &status);
  81
  82     /** Destructor
  83      *  Cleans pieces
  84      * @stable ICU 2.4
  85      */
  86     virtual ~CanonicalIterator();
  87
  88     /**
  89      * Gets the NFD form of the current source we are iterating over.
  90      * @return gets the source: NOTE: it is the NFD form of source
  91      * @stable ICU 2.4
  92      */
  93     UnicodeString getSource();
  94
  95     /**
  96      * Resets the iterator so that one can start again from the beginning.
  97      * @stable ICU 2.4
  98      */
  99     void reset();
 100
 101     /**
 102      * Get the next canonically equivalent string.
 103      * <br><b>Warning: The strings are not guaranteed to be in any particular order.</b>
 104      * @return the next string that is canonically equivalent. A bogus string is returned when
 105      * the iteration is done.
 106      * @stable ICU 2.4
 107      */
 108     UnicodeString next();
 109
 110     /**
 111      * Set a new source for this iterator. Allows object reuse.
 112      * @param newSource     the source string to iterate against. This allows the same iterator to be used
 113      *                     while changing the source string, saving object creation.
 114      * @param status        Fill-in parameter which receives the status of this operation.
 115      * @stable ICU 2.4
 116      */
 117     void setSource(const UnicodeString &newSource, UErrorCode &status);
 118
 119     /**
 120      * Dumb recursive implementation of permutation.
 121      * TODO: optimize
 122      * @param source     the string to find permutations for
 123      * @param skipZeros  determine if skip zeros
 124      * @param result     the results in a set.
 125      * @param status       Fill-in parameter which receives the status of this operation.
 126      * @internal
 127      */
 128     static void U_EXPORT2 permute(UnicodeString &source, UBool skipZeros, Hashtable *result, UErrorCode &status);
 129
 130     /**
 131      * ICU "poor man's RTTI", returns a UClassID for this class.
 132      *
 133      * @stable ICU 2.2
 134      */
 135     static UClassID U_EXPORT2 getStaticClassID();
 136
 137     /**
 138      * ICU "poor man's RTTI", returns a UClassID for the actual class.
 139      *
 140      * @stable ICU 2.2
 141      */
 142     virtual UClassID getDynamicClassID() const;
 143
 144 private:
 145     // ===================== PRIVATES ==============================
 146     // private default constructor
 147     CanonicalIterator();
 148
 149
 150     /**
 151      * Copy constructor. Private for now.
 152      * @internal
 153      */
 154     CanonicalIterator(const CanonicalIterator& other);
 155
 156     /**
 157      * Assignment operator. Private for now.
 158      * @internal
 159      */
 160     CanonicalIterator& operator=(const CanonicalIterator& other);
 161
 162     // fields
 163     UnicodeString source;
 164     UBool done;
 165
 166     // 2 dimensional array holds the pieces of the string with
 167     // their different canonically equivalent representations
 168     UnicodeString **pieces;
 169     int32_t pieces_length;
 170     int32_t *pieces_lengths;
 171
 172     // current is used in iterating to combine pieces
 173     int32_t *current;
 174     int32_t current_length;
 175
 176     // transient fields
 177     UnicodeString buffer;
 178
 179     const Normalizer2 &nfd;
 180     const Normalizer2Impl &nfcImpl;
 181
 182     // we have a segment, in NFD. Find all the strings that are canonically equivalent to it.
 183     UnicodeString *getEquivalents(const UnicodeString &segment, int32_t &result_len, UErrorCode &status); //private String[] getEquivalents(String segment)
 184
 185     //Set getEquivalents2(String segment);
 186     Hashtable *getEquivalents2(Hashtable *fillinResult, const UChar *segment, int32_t segLen, UErrorCode &status);
 187     //Hashtable *getEquivalents2(const UnicodeString &segment, int32_t segLen, UErrorCode &status);
 188
 189     /**
 190      * See if the decomposition of cp2 is at segment starting at segmentPos
 191      * (with canonical rearrangment!)
 192      * If so, take the remainder, and return the equivalents
 193      */
 194     //Set extract(int comp, String segment, int segmentPos, StringBuffer buffer);
 195     Hashtable *extract(Hashtable *fillinResult, UChar32 comp, const UChar *segment, int32_t segLen, int32_t segmentPos, UErrorCode &status);
 196     //Hashtable *extract(UChar32 comp, const UnicodeString &segment, int32_t segLen, int32_t segmentPos, UErrorCode &status);
 197
 198     void cleanPieces();
 199
 200 };
 201
 202 U_NAMESPACE_END
 203
 204 #endif /* #if !UCONFIG_NO_NORMALIZATION */
 205
 206 #endif