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comparison: intl/icu/source/common/unicode/caniter.h

intl/icu/source/common/unicode/caniter.h

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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

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