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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* 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: char16_t Character Iterator
*/
U_NAMESPACE_BEGIN
/**
* A concrete subclass of CharacterIterator that iterates over the
* characters (code units or code points) in a char16_t array.
* It's possible not only to create an
* iterator that iterates over an entire char16_t array, but also to
* create one that iterates over only a subrange of a char16_t array
* (iterators over different subranges of the same char16_t 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 char16_t 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 char16_t array to be iterated over
* @param length The length of the char16_t array
* @stable ICU 2.0
*/
UCharCharacterIterator(ConstChar16Ptr textPtr, int32_t length);
/**
* Create an iterator over the char16_t 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 char16_t array to be iteratd over
* @param length The length of the char16_t array
* @param position The starting position of the iteration
* @stable ICU 2.0
*/
UCharCharacterIterator(ConstChar16Ptr textPtr, int32_t length,
int32_t position);
/**
* Create an iterator over the char16_t 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 char16_t array to be iterated over
* @param length The length of the char16_t 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(ConstChar16Ptr 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 char16_t 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 char16_t 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 char16_t 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 char16_t 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 char16_t 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 char16_t 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 char16_t 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 char16_t 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
*/
#ifdef move32
// One of the system headers right now is sometimes defining a conflicting macro we don't use
#undef move32
#endif
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(ConstChar16Ptr newText, int32_t newTextLength);
/**
* Copies the char16_t 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 char16_t* text;
};
U_NAMESPACE_END
#endif