1 /* 2 ******************************************************************************* 3 * Copyright (C) 1996-2011, 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 #ifndef U_HIDE_INTERNAL_API 120 /** 121 * Dumb recursive implementation of permutation. 122 * TODO: optimize 123 * @param source the string to find permutations for 124 * @param skipZeros determine if skip zeros 125 * @param result the results in a set. 126 * @param status Fill-in parameter which receives the status of this operation. 127 * @internal 128 */ 129 static void U_EXPORT2 permute(UnicodeString &source, UBool skipZeros, Hashtable *result, UErrorCode &status); 130 #endif /* U_HIDE_INTERNAL_API */ 131 132 /** 133 * ICU "poor man's RTTI", returns a UClassID for this class. 134 * 135 * @stable ICU 2.2 136 */ 137 static UClassID U_EXPORT2 getStaticClassID(); 138 139 /** 140 * ICU "poor man's RTTI", returns a UClassID for the actual class. 141 * 142 * @stable ICU 2.2 143 */ 144 virtual UClassID getDynamicClassID() const; 145 146 private: 147 // ===================== PRIVATES ============================== 148 // private default constructor 149 CanonicalIterator(); 150 151 152 /** 153 * Copy constructor. Private for now. 154 * @internal 155 */ 156 CanonicalIterator(const CanonicalIterator& other); 157 158 /** 159 * Assignment operator. Private for now. 160 * @internal 161 */ 162 CanonicalIterator& operator=(const CanonicalIterator& other); 163 164 // fields 165 UnicodeString source; 166 UBool done; 167 168 // 2 dimensional array holds the pieces of the string with 169 // their different canonically equivalent representations 170 UnicodeString **pieces; 171 int32_t pieces_length; 172 int32_t *pieces_lengths; 173 174 // current is used in iterating to combine pieces 175 int32_t *current; 176 int32_t current_length; 177 178 // transient fields 179 UnicodeString buffer; 180 181 const Normalizer2 &nfd; 182 const Normalizer2Impl &nfcImpl; 183 184 // we have a segment, in NFD. Find all the strings that are canonically equivalent to it. 185 UnicodeString *getEquivalents(const UnicodeString &segment, int32_t &result_len, UErrorCode &status); //private String[] getEquivalents(String segment) 186 187 //Set getEquivalents2(String segment); 188 Hashtable *getEquivalents2(Hashtable *fillinResult, const UChar *segment, int32_t segLen, UErrorCode &status); 189 //Hashtable *getEquivalents2(const UnicodeString &segment, int32_t segLen, UErrorCode &status); 190 191 /** 192 * See if the decomposition of cp2 is at segment starting at segmentPos 193 * (with canonical rearrangment!) 194 * If so, take the remainder, and return the equivalents 195 */ 196 //Set extract(int comp, String segment, int segmentPos, StringBuffer buffer); 197 Hashtable *extract(Hashtable *fillinResult, UChar32 comp, const UChar *segment, int32_t segLen, int32_t segmentPos, UErrorCode &status); 198 //Hashtable *extract(UChar32 comp, const UnicodeString &segment, int32_t segLen, int32_t segmentPos, UErrorCode &status); 199 200 void cleanPieces(); 201 202 }; 203 204 U_NAMESPACE_END 205 206 #endif /* #if !UCONFIG_NO_NORMALIZATION */ 207 208 #endif 209
