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/* ********************************************************************** * Copyright (C) 1998-2005, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** */ #ifndef UCHRITER_H #define UCHRITER_H #include "unicode/utypes.h" #include "unicode/chariter.h" /** * \file * \brief C++ API: UChar Character Iterator */ U_NAMESPACE_BEGIN /** * A concrete subclass of CharacterIterator that iterates over the * characters (code units or code points) in a UChar array. * It's possible not only to create an * iterator that iterates over an entire UChar array, but also to * create one that iterates over only a subrange of a UChar array * (iterators over different subranges of the same UChar array don't * compare equal). * @see CharacterIterator * @see ForwardCharacterIterator * @stable ICU 2.0 */ class U_COMMON_API UCharCharacterIterator : public CharacterIterator { public: /** * Create an iterator over the UChar array referred to by "textPtr". * The iteration range is 0 to <code>length-1</code>. * text is only aliased, not adopted (the * destructor will not delete it). * @param textPtr The UChar array to be iterated over * @param length The length of the UChar array * @stable ICU 2.0 */ UCharCharacterIterator(const UChar* textPtr, int32_t length); /** * Create an iterator over the UChar array referred to by "textPtr". * The iteration range is 0 to <code>length-1</code>. * text is only aliased, not adopted (the * destructor will not delete it). * The starting * position is specified by "position". If "position" is outside the valid * iteration range, the behavior of this object is undefined. * @param textPtr The UChar array to be iteratd over * @param length The length of the UChar array * @param position The starting position of the iteration * @stable ICU 2.0 */ UCharCharacterIterator(const UChar* textPtr, int32_t length, int32_t position); /** * Create an iterator over the UChar array referred to by "textPtr". * The iteration range is 0 to <code>end-1</code>. * text is only aliased, not adopted (the * destructor will not delete it). * The starting * position is specified by "position". If begin and end do not * form a valid iteration range or "position" is outside the valid * iteration range, the behavior of this object is undefined. * @param textPtr The UChar array to be iterated over * @param length The length of the UChar array * @param textBegin The begin position of the iteration range * @param textEnd The end position of the iteration range * @param position The starting position of the iteration * @stable ICU 2.0 */ UCharCharacterIterator(const UChar* textPtr, int32_t length, int32_t textBegin, int32_t textEnd, int32_t position); /** * Copy constructor. The new iterator iterates over the same range * of the same string as "that", and its initial position is the * same as "that"'s current position. * @param that The UCharCharacterIterator to be copied * @stable ICU 2.0 */ UCharCharacterIterator(const UCharCharacterIterator& that); /** * Destructor. * @stable ICU 2.0 */ virtual ~UCharCharacterIterator(); /** * Assignment operator. *this is altered to iterate over the sane * range of the same string as "that", and refers to the same * character within that string as "that" does. * @param that The object to be copied * @return the newly created object * @stable ICU 2.0 */ UCharCharacterIterator& operator=(const UCharCharacterIterator& that); /** * Returns true if the iterators iterate over the same range of the * same string and are pointing at the same character. * @param that The ForwardCharacterIterator used to be compared for equality * @return true if the iterators iterate over the same range of the * same string and are pointing at the same character. * @stable ICU 2.0 */ virtual UBool operator==(const ForwardCharacterIterator& that) const; /** * Generates a hash code for this iterator. * @return the hash code. * @stable ICU 2.0 */ virtual int32_t hashCode(void) const; /** * Returns a new UCharCharacterIterator referring to the same * character in the same range of the same string as this one. The * caller must delete the new iterator. * @return the CharacterIterator newly created * @stable ICU 2.0 */ virtual CharacterIterator* clone(void) const; /** * Sets the iterator to refer to the first code unit in its * iteration range, and returns that code unit. * This can be used to begin an iteration with next(). * @return the first code unit in its iteration range. * @stable ICU 2.0 */ virtual UChar first(void); /** * Sets the iterator to refer to the first code unit in its * iteration range, returns that code unit, and moves the position * to the second code unit. This is an alternative to setToStart() * for forward iteration with nextPostInc(). * @return the first code unit in its iteration range * @stable ICU 2.0 */ virtual UChar firstPostInc(void); /** * Sets the iterator to refer to the first code point in its * iteration range, and returns that code unit, * This can be used to begin an iteration with next32(). * Note that an iteration with next32PostInc(), beginning with, * e.g., setToStart() or firstPostInc(), is more efficient. * @return the first code point in its iteration range * @stable ICU 2.0 */ virtual UChar32 first32(void); /** * Sets the iterator to refer to the first code point in its * iteration range, returns that code point, and moves the position * to the second code point. This is an alternative to setToStart() * for forward iteration with next32PostInc(). * @return the first code point in its iteration range. * @stable ICU 2.0 */ virtual UChar32 first32PostInc(void); /** * Sets the iterator to refer to the last code unit in its * iteration range, and returns that code unit. * This can be used to begin an iteration with previous(). * @return the last code unit in its iteration range. * @stable ICU 2.0 */ virtual UChar last(void); /** * Sets the iterator to refer to the last code point in its * iteration range, and returns that code unit. * This can be used to begin an iteration with previous32(). * @return the last code point in its iteration range. * @stable ICU 2.0 */ virtual UChar32 last32(void); /** * Sets the iterator to refer to the "position"-th code unit * in the text-storage object the iterator refers to, and * returns that code unit. * @param position the position within the text-storage object * @return the code unit * @stable ICU 2.0 */ virtual UChar setIndex(int32_t position); /** * Sets the iterator to refer to the beginning of the code point * that contains the "position"-th code unit * in the text-storage object the iterator refers to, and * returns that code point. * The current position is adjusted to the beginning of the code point * (its first code unit). * @param position the position within the text-storage object * @return the code unit * @stable ICU 2.0 */ virtual UChar32 setIndex32(int32_t position); /** * Returns the code unit the iterator currently refers to. * @return the code unit the iterator currently refers to. * @stable ICU 2.0 */ virtual UChar current(void) const; /** * Returns the code point the iterator currently refers to. * @return the code point the iterator currently refers to. * @stable ICU 2.0 */ virtual UChar32 current32(void) const; /** * Advances to the next code unit in the iteration range (toward * endIndex()), and returns that code unit. If there are no more * code units to return, returns DONE. * @return the next code unit in the iteration range. * @stable ICU 2.0 */ virtual UChar next(void); /** * Gets the current code unit for returning and advances to the next code unit * in the iteration range * (toward endIndex()). If there are * no more code units to return, returns DONE. * @return the current code unit. * @stable ICU 2.0 */ virtual UChar nextPostInc(void); /** * Advances to the next code point in the iteration range (toward * endIndex()), and returns that code point. If there are no more * code points to return, returns DONE. * Note that iteration with "pre-increment" semantics is less * efficient than iteration with "post-increment" semantics * that is provided by next32PostInc(). * @return the next code point in the iteration range. * @stable ICU 2.0 */ virtual UChar32 next32(void); /** * Gets the current code point for returning and advances to the next code point * in the iteration range * (toward endIndex()). If there are * no more code points to return, returns DONE. * @return the current point. * @stable ICU 2.0 */ virtual UChar32 next32PostInc(void); /** * Returns FALSE if there are no more code units or code points * at or after the current position in the iteration range. * This is used with nextPostInc() or next32PostInc() in forward * iteration. * @return FALSE if there are no more code units or code points * at or after the current position in the iteration range. * @stable ICU 2.0 */ virtual UBool hasNext(); /** * Advances to the previous code unit in the iteration range (toward * startIndex()), and returns that code unit. If there are no more * code units to return, returns DONE. * @return the previous code unit in the iteration range. * @stable ICU 2.0 */ virtual UChar previous(void); /** * Advances to the previous code point in the iteration range (toward * startIndex()), and returns that code point. If there are no more * code points to return, returns DONE. * @return the previous code point in the iteration range. * @stable ICU 2.0 */ virtual UChar32 previous32(void); /** * Returns FALSE if there are no more code units or code points * before the current position in the iteration range. * This is used with previous() or previous32() in backward * iteration. * @return FALSE if there are no more code units or code points * before the current position in the iteration range. * @stable ICU 2.0 */ virtual UBool hasPrevious(); /** * Moves the current position relative to the start or end of the * iteration range, or relative to the current position itself. * The movement is expressed in numbers of code units forward * or backward by specifying a positive or negative delta. * @param delta the position relative to origin. A positive delta means forward; * a negative delta means backward. * @param origin Origin enumeration {kStart, kCurrent, kEnd} * @return the new position * @stable ICU 2.0 */ virtual int32_t move(int32_t delta, EOrigin origin); /** * Moves the current position relative to the start or end of the * iteration range, or relative to the current position itself. * The movement is expressed in numbers of code points forward * or backward by specifying a positive or negative delta. * @param delta the position relative to origin. A positive delta means forward; * a negative delta means backward. * @param origin Origin enumeration {kStart, kCurrent, kEnd} * @return the new position * @stable ICU 2.0 */ virtual int32_t move32(int32_t delta, EOrigin origin); /** * Sets the iterator to iterate over a new range of text * @stable ICU 2.0 */ void setText(const UChar* newText, int32_t newTextLength); /** * Copies the UChar array under iteration into the UnicodeString * referred to by "result". Even if this iterator iterates across * only a part of this string, the whole string is copied. * @param result Receives a copy of the text under iteration. * @stable ICU 2.0 */ virtual void getText(UnicodeString& result); /** * Return a class ID for this class (not really public) * @return a class ID for this class * @stable ICU 2.0 */ static UClassID U_EXPORT2 getStaticClassID(void); /** * Return a class ID for this object (not really public) * @return a class ID for this object. * @stable ICU 2.0 */ virtual UClassID getDynamicClassID(void) const; protected: /** * Protected constructor * @stable ICU 2.0 */ UCharCharacterIterator(); /** * Protected member text * @stable ICU 2.0 */ const UChar* text; }; U_NAMESPACE_END #endif