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Diffstat (limited to 'intl/icu/source/common/unicode/uchriter.h')
| -rw-r--r-- | intl/icu/source/common/unicode/uchriter.h | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/intl/icu/source/common/unicode/uchriter.h b/intl/icu/source/common/unicode/uchriter.h new file mode 100644 index 0000000000..9fae5e7de0 --- /dev/null +++ b/intl/icu/source/common/unicode/uchriter.h @@ -0,0 +1,393 @@ +// © 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" + +#if U_SHOW_CPLUSPLUS_API + +#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 iterated 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 bool operator==(const ForwardCharacterIterator& that) const override; + + /** + * Generates a hash code for this iterator. + * @return the hash code. + * @stable ICU 2.0 + */ + virtual int32_t hashCode(void) const override; + + /** + * 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 UCharCharacterIterator* clone() const override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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 override; + + /** + * 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 override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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() override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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() override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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) override; + + /** + * 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 override; + +protected: + /** + * Protected constructor + * @stable ICU 2.0 + */ + UCharCharacterIterator(); + /** + * Protected member text + * @stable ICU 2.0 + */ + const char16_t* text; + +}; + +U_NAMESPACE_END + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif |