--- /dev/null
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+ *******************************************************************************
+ * Copyright (C) 1996-2014, International Business Machines Corporation and
+ * others. All Rights Reserved.
+ *******************************************************************************
+ */
+
+#ifndef CANITER_H
+#define CANITER_H
+
+#include "unicode/utypes.h"
+
+#if U_SHOW_CPLUSPLUS_API
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#include "unicode/uobject.h"
+#include "unicode/unistr.h"
+
+/**
+ * \file
+ * \brief C++ API: Canonical Iterator
+ */
+
+/** Should permutation skip characters with combining class zero
+ * Should be either true or false. This is a compile time option
+ * @stable ICU 2.4
+ */
+#ifndef CANITER_SKIP_ZEROES
+#define CANITER_SKIP_ZEROES true
+#endif
+
+U_NAMESPACE_BEGIN
+
+class Hashtable;
+class Normalizer2;
+class Normalizer2Impl;
+
+/**
+ * This class allows one to iterate through all the strings that are canonically equivalent to a given
+ * string. For example, here are some sample results:
+Results for: {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
+1: \\u0041\\u030A\\u0064\\u0307\\u0327
+ = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
+2: \\u0041\\u030A\\u0064\\u0327\\u0307
+ = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
+3: \\u0041\\u030A\\u1E0B\\u0327
+ = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
+4: \\u0041\\u030A\\u1E11\\u0307
+ = {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
+5: \\u00C5\\u0064\\u0307\\u0327
+ = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
+6: \\u00C5\\u0064\\u0327\\u0307
+ = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
+7: \\u00C5\\u1E0B\\u0327
+ = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
+8: \\u00C5\\u1E11\\u0307
+ = {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
+9: \\u212B\\u0064\\u0307\\u0327
+ = {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
+10: \\u212B\\u0064\\u0327\\u0307
+ = {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
+11: \\u212B\\u1E0B\\u0327
+ = {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
+12: \\u212B\\u1E11\\u0307
+ = {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
+ *<br>Note: the code is intended for use with small strings, and is not suitable for larger ones,
+ * since it has not been optimized for that situation.
+ * Note, CanonicalIterator is not intended to be subclassed.
+ * @author M. Davis
+ * @author C++ port by V. Weinstein
+ * @stable ICU 2.4
+ */
+class U_COMMON_API CanonicalIterator U_FINAL : public UObject {
+public:
+ /**
+ * Construct a CanonicalIterator object
+ * @param source string to get results for
+ * @param status Fill-in parameter which receives the status of this operation.
+ * @stable ICU 2.4
+ */
+ CanonicalIterator(const UnicodeString &source, UErrorCode &status);
+
+ /** Destructor
+ * Cleans pieces
+ * @stable ICU 2.4
+ */
+ virtual ~CanonicalIterator();
+
+ /**
+ * Gets the NFD form of the current source we are iterating over.
+ * @return gets the source: NOTE: it is the NFD form of source
+ * @stable ICU 2.4
+ */
+ UnicodeString getSource();
+
+ /**
+ * Resets the iterator so that one can start again from the beginning.
+ * @stable ICU 2.4
+ */
+ void reset();
+
+ /**
+ * Get the next canonically equivalent string.
+ * <br><b>Warning: The strings are not guaranteed to be in any particular order.</b>
+ * @return the next string that is canonically equivalent. A bogus string is returned when
+ * the iteration is done.
+ * @stable ICU 2.4
+ */
+ UnicodeString next();
+
+ /**
+ * Set a new source for this iterator. Allows object reuse.
+ * @param newSource the source string to iterate against. This allows the same iterator to be used
+ * while changing the source string, saving object creation.
+ * @param status Fill-in parameter which receives the status of this operation.
+ * @stable ICU 2.4
+ */
+ void setSource(const UnicodeString &newSource, UErrorCode &status);
+
+#ifndef U_HIDE_INTERNAL_API
+ /**
+ * Dumb recursive implementation of permutation.
+ * TODO: optimize
+ * @param source the string to find permutations for
+ * @param skipZeros determine if skip zeros
+ * @param result the results in a set.
+ * @param status Fill-in parameter which receives the status of this operation.
+ * @internal
+ */
+ static void U_EXPORT2 permute(UnicodeString &source, UBool skipZeros, Hashtable *result, UErrorCode &status);
+#endif /* U_HIDE_INTERNAL_API */
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for this class.
+ *
+ * @stable ICU 2.2
+ */
+ static UClassID U_EXPORT2 getStaticClassID();
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for the actual class.
+ *
+ * @stable ICU 2.2
+ */
+ virtual UClassID getDynamicClassID() const override;
+
+private:
+ // ===================== PRIVATES ==============================
+ // private default constructor
+ CanonicalIterator();
+
+
+ /**
+ * Copy constructor. Private for now.
+ * @internal (private)
+ */
+ CanonicalIterator(const CanonicalIterator& other);
+
+ /**
+ * Assignment operator. Private for now.
+ * @internal (private)
+ */
+ CanonicalIterator& operator=(const CanonicalIterator& other);
+
+ // fields
+ UnicodeString source;
+ UBool done;
+
+ // 2 dimensional array holds the pieces of the string with
+ // their different canonically equivalent representations
+ UnicodeString **pieces;
+ int32_t pieces_length;
+ int32_t *pieces_lengths;
+
+ // current is used in iterating to combine pieces
+ int32_t *current;
+ int32_t current_length;
+
+ // transient fields
+ UnicodeString buffer;
+
+ const Normalizer2 &nfd;
+ const Normalizer2Impl &nfcImpl;
+
+ // we have a segment, in NFD. Find all the strings that are canonically equivalent to it.
+ UnicodeString *getEquivalents(const UnicodeString &segment, int32_t &result_len, UErrorCode &status); //private String[] getEquivalents(String segment)
+
+ //Set getEquivalents2(String segment);
+ Hashtable *getEquivalents2(Hashtable *fillinResult, const char16_t *segment, int32_t segLen, UErrorCode &status);
+ //Hashtable *getEquivalents2(const UnicodeString &segment, int32_t segLen, UErrorCode &status);
+
+ /**
+ * See if the decomposition of cp2 is at segment starting at segmentPos
+ * (with canonical rearrangement!)
+ * If so, take the remainder, and return the equivalents
+ */
+ //Set extract(int comp, String segment, int segmentPos, StringBuffer buffer);
+ Hashtable *extract(Hashtable *fillinResult, UChar32 comp, const char16_t *segment, int32_t segLen, int32_t segmentPos, UErrorCode &status);
+ //Hashtable *extract(UChar32 comp, const UnicodeString &segment, int32_t segLen, int32_t segmentPos, UErrorCode &status);
+
+ void cleanPieces();
+
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_NORMALIZATION */
+
+#endif /* U_SHOW_CPLUSPLUS_API */
+
+#endif
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