initial commit, 4.5 stable

thirdparty/icu4c/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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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() 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();
+
+  /**
+   * Return a class ID for this object (not really public)
+   * @return a class ID for this object.
+   * @stable ICU 2.0
+   */
+  virtual UClassID getDynamicClassID() 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