#$@%#$%!

Ngiler SH3LL 360
: / opt / alt / alt-nodejs18 / root / usr / include / unicode /

Information Server
MySQL : OFF Perl : OFF CURL : ON WGET : OFF PKEXEC : OFF

Directive	Local Value
IP Address	162.0.209.101
System	Linux premium169.web-hosting.com 4.18.0-553.50.1.lve.el8.x86_64 #1 SMP Thu Apr 17 19:10:24 UTC 2025 x86_64
User	luxeelil
PHP Version	8.0.30
Software	LiteSpeed
Doc root	Writable

Edit File : search.h \| Size : 22.24 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (C) 2001-2011 IBM and others. All rights reserved. ********************************************************************** * Date Name Description * 03/22/2000 helena Creation. ********************************************************************** / #ifndef SEARCH_H #define SEARCH_H #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /* * \file * \brief C++ API: SearchIterator object. / #if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION #include "unicode/uobject.h" #include "unicode/unistr.h" #include "unicode/chariter.h" #include "unicode/brkiter.h" #include "unicode/usearch.h" /* * @stable ICU 2.0 / struct USearch; /* * @stable ICU 2.0 / typedef struct USearch USearch; U_NAMESPACE_BEGIN /* * * <tt>SearchIterator</tt> is an abstract base class that provides * methods to search for a pattern within a text string. Instances of * <tt>SearchIterator</tt> maintain a current position and scans over the * target text, returning the indices the pattern is matched and the length * of each match. * <p> * <tt>SearchIterator</tt> defines a protocol for text searching. * Subclasses provide concrete implementations of various search algorithms. * For example, <tt>StringSearch</tt> implements language-sensitive pattern * matching based on the comparison rules defined in a * <tt>RuleBasedCollator</tt> object. * <p> * Other options for searching includes using a BreakIterator to restrict * the points at which matches are detected. * <p> * <tt>SearchIterator</tt> provides an API that is similar to that of * other text iteration classes such as <tt>BreakIterator</tt>. Using * this class, it is easy to scan through text looking for all occurrences of * a given pattern. The following example uses a <tt>StringSearch</tt> * object to find all instances of "fox" in the target string. Any other * subclass of <tt>SearchIterator</tt> can be used in an identical * manner. * <pre><code> * UnicodeString target("The quick brown fox jumped over the lazy fox"); * UnicodeString pattern("fox"); * * SearchIterator iter = new StringSearch(pattern, target); UErrorCode error = U_ZERO_ERROR; * for (int pos = iter->first(error); pos != USEARCH_DONE; * pos = iter->next(error)) { * printf("Found match at %d pos, length is %d\n", pos, iter.getMatchedLength()); * } * </code></pre> * * @see StringSearch * @see RuleBasedCollator / class U_I18N_API SearchIterator : public UObject { public: // public constructors and destructors ------------------------------- /* * Copy constructor that creates a SearchIterator instance with the same * behavior, and iterating over the same text. * @param other the SearchIterator instance to be copied. * @stable ICU 2.0 / SearchIterator(const SearchIterator &other); /* * Destructor. Cleans up the search iterator data struct. * @stable ICU 2.0 / virtual ~SearchIterator(); // public get and set methods ---------------------------------------- /* * Sets the index to point to the given position, and clears any state * that's affected. * <p> * This method takes the argument index and sets the position in the text * string accordingly without checking if the index is pointing to a * valid starting point to begin searching. * @param position within the text to be set. If position is less * than or greater than the text range for searching, * an U_INDEX_OUTOFBOUNDS_ERROR will be returned * @param status for errors if it occurs * @stable ICU 2.0 / virtual void setOffset(int32_t position, UErrorCode &status) = 0; /* * Return the current index in the text being searched. * If the iteration has gone past the end of the text * (or past the beginning for a backwards search), USEARCH_DONE * is returned. * @return current index in the text being searched. * @stable ICU 2.0 / virtual int32_t getOffset(void) const = 0; /* * Sets the text searching attributes located in the enum * USearchAttribute with values from the enum USearchAttributeValue. * USEARCH_DEFAULT can be used for all attributes for resetting. * @param attribute text attribute (enum USearchAttribute) to be set * @param value text attribute value * @param status for errors if it occurs * @stable ICU 2.0 / void setAttribute(USearchAttribute attribute, USearchAttributeValue value, UErrorCode &status); /* * Gets the text searching attributes * @param attribute text attribute (enum USearchAttribute) to be retrieve * @return text attribute value * @stable ICU 2.0 / USearchAttributeValue getAttribute(USearchAttribute attribute) const; /* * Returns the index to the match in the text string that was searched. * This call returns a valid result only after a successful call to * <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>. * Just after construction, or after a searching method returns * <tt>USEARCH_DONE</tt>, this method will return <tt>USEARCH_DONE</tt>. * <p> * Use getMatchedLength to get the matched string length. * @return index of a substring within the text string that is being * searched. * @see #first * @see #next * @see #previous * @see #last * @stable ICU 2.0 / int32_t getMatchedStart(void) const; /* * Returns the length of text in the string which matches the search * pattern. This call returns a valid result only after a successful call * to <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>. * Just after construction, or after a searching method returns * <tt>USEARCH_DONE</tt>, this method will return 0. * @return The length of the match in the target text, or 0 if there * is no match currently. * @see #first * @see #next * @see #previous * @see #last * @stable ICU 2.0 / int32_t getMatchedLength(void) const; /* * Returns the text that was matched by the most recent call to * <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>. * If the iterator is not pointing at a valid match (e.g. just after * construction or after <tt>USEARCH_DONE</tt> has been returned, * returns an empty string. * @param result stores the matched string or an empty string if a match * is not found. * @see #first * @see #next * @see #previous * @see #last * @stable ICU 2.0 / void getMatchedText(UnicodeString &result) const; /* * Set the BreakIterator that will be used to restrict the points * at which matches are detected. The user is responsible for deleting * the breakiterator. * @param breakiter A BreakIterator that will be used to restrict the * points at which matches are detected. If a match is * found, but the match's start or end index is not a * boundary as determined by the <tt>BreakIterator</tt>, * the match will be rejected and another will be searched * for. If this parameter is <tt>nullptr</tt>, no break * detection is attempted. * @param status for errors if it occurs * @see BreakIterator * @stable ICU 2.0 / void setBreakIterator(BreakIterator breakiter, UErrorCode &status); /** * Returns the BreakIterator that is used to restrict the points at * which matches are detected. This will be the same object that was * passed to the constructor or to <tt>setBreakIterator</tt>. * Note that <tt>nullptr</tt> is a legal value; it means that break * detection should not be attempted. * @return BreakIterator used to restrict matchings. * @see #setBreakIterator * @stable ICU 2.0 / const BreakIterator getBreakIterator(void) const; /** * Set the string text to be searched. Text iteration will hence begin at * the start of the text string. This method is useful if you want to * re-use an iterator to search for the same pattern within a different * body of text. The user is responsible for deleting the text. * @param text string to be searched. * @param status for errors. If the text length is 0, * an U_ILLEGAL_ARGUMENT_ERROR is returned. * @stable ICU 2.0 / virtual void setText(const UnicodeString &text, UErrorCode &status); /* * Set the string text to be searched. Text iteration will hence begin at * the start of the text string. This method is useful if you want to * re-use an iterator to search for the same pattern within a different * body of text. * <p> * Note: No parsing of the text within the <tt>CharacterIterator</tt> * will be done during searching for this version. The block of text * in <tt>CharacterIterator</tt> will be used as it is. * The user is responsible for deleting the text. * @param text string iterator to be searched. * @param status for errors if any. If the text length is 0 then an * U_ILLEGAL_ARGUMENT_ERROR is returned. * @stable ICU 2.0 / virtual void setText(CharacterIterator &text, UErrorCode &status); /* * Return the string text to be searched. * @return text string to be searched. * @stable ICU 2.0 / const UnicodeString & getText(void) const; // operator overloading ---------------------------------------------- /* * Equality operator. * @param that SearchIterator instance to be compared. * @return true if both BreakIterators are of the same class, have the * same behavior, terates over the same text and have the same * attributes. false otherwise. * @stable ICU 2.0 / virtual bool operator==(const SearchIterator &that) const; /* * Not-equal operator. * @param that SearchIterator instance to be compared. * @return false if operator== returns true, and vice versa. * @stable ICU 2.0 / bool operator!=(const SearchIterator &that) const; // public methods ---------------------------------------------------- /* * Returns a copy of SearchIterator with the same behavior, and * iterating over the same text, as this one. Note that all data will be * replicated, except for the text string to be searched. * @return cloned object * @stable ICU 2.0 / virtual SearchIterator safeClone(void) const = 0; /** * Returns the first index at which the string text matches the search * pattern. The iterator is adjusted so that its current index (as * returned by <tt>getOffset</tt>) is the match position if one * was found. * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and * the iterator will be adjusted to the index USEARCH_DONE * @param status for errors if it occurs * @return The character index of the first match, or * <tt>USEARCH_DONE</tt> if there are no matches. * @see #getOffset * @stable ICU 2.0 / int32_t first(UErrorCode &status); /* * Returns the first index equal or greater than <tt>position</tt> at which the * string text matches the search pattern. The iterator is adjusted so * that its current index (as returned by <tt>getOffset</tt>) is the * match position if one was found. * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and the * iterator will be adjusted to the index <tt>USEARCH_DONE</tt>. * @param position where search if to start from. If position is less * than or greater than the text range for searching, * an U_INDEX_OUTOFBOUNDS_ERROR will be returned * @param status for errors if it occurs * @return The character index of the first match following * <tt>position</tt>, or <tt>USEARCH_DONE</tt> if there are no * matches. * @see #getOffset * @stable ICU 2.0 / int32_t following(int32_t position, UErrorCode &status); /* * Returns the last index in the target text at which it matches the * search pattern. The iterator is adjusted so that its current index * (as returned by <tt>getOffset</tt>) is the match position if one was * found. * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and * the iterator will be adjusted to the index USEARCH_DONE. * @param status for errors if it occurs * @return The index of the first match, or <tt>USEARCH_DONE</tt> if * there are no matches. * @see #getOffset * @stable ICU 2.0 / int32_t last(UErrorCode &status); /* * Returns the first index less than <tt>position</tt> at which the string * text matches the search pattern. The iterator is adjusted so that its * current index (as returned by <tt>getOffset</tt>) is the match * position if one was found. If a match is not found, * <tt>USEARCH_DONE</tt> will be returned and the iterator will be * adjusted to the index USEARCH_DONE * <p> * When <tt>USEARCH_OVERLAP</tt> option is off, the last index of the * result match is always less than <tt>position</tt>. * When <tt>USERARCH_OVERLAP</tt> is on, the result match may span across * <tt>position</tt>. * * @param position where search is to start from. If position is less * than or greater than the text range for searching, * an U_INDEX_OUTOFBOUNDS_ERROR will be returned * @param status for errors if it occurs * @return The character index of the first match preceding * <tt>position</tt>, or <tt>USEARCH_DONE</tt> if there are * no matches. * @see #getOffset * @stable ICU 2.0 / int32_t preceding(int32_t position, UErrorCode &status); /* * Returns the index of the next point at which the text matches the * search pattern, starting from the current position * The iterator is adjusted so that its current index (as returned by * <tt>getOffset</tt>) is the match position if one was found. * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and * the iterator will be adjusted to a position after the end of the text * string. * @param status for errors if it occurs * @return The index of the next match after the current position, * or <tt>USEARCH_DONE</tt> if there are no more matches. * @see #getOffset * @stable ICU 2.0 / int32_t next(UErrorCode &status); /* * Returns the index of the previous point at which the string text * matches the search pattern, starting at the current position. * The iterator is adjusted so that its current index (as returned by * <tt>getOffset</tt>) is the match position if one was found. * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and * the iterator will be adjusted to the index USEARCH_DONE * @param status for errors if it occurs * @return The index of the previous match before the current position, * or <tt>USEARCH_DONE</tt> if there are no more matches. * @see #getOffset * @stable ICU 2.0 / int32_t previous(UErrorCode &status); /* * Resets the iteration. * Search will begin at the start of the text string if a forward * iteration is initiated before a backwards iteration. Otherwise if a * backwards iteration is initiated before a forwards iteration, the * search will begin at the end of the text string. * @stable ICU 2.0 / virtual void reset(); protected: // protected data members --------------------------------------------- /* * C search data struct * @stable ICU 2.0 / USearch m_search_; /** * Break iterator. * Currently the C++ breakiterator does not have getRules etc to reproduce * another in C. Hence we keep the original around and do the verification * at the end of the match. The user is responsible for deleting this * break iterator. * @stable ICU 2.0 / BreakIterator m_breakiterator_; /** * Unicode string version of the search text * @stable ICU 2.0 / UnicodeString m_text_; // protected constructors and destructors ----------------------------- /* * Default constructor. * Initializes data to the default values. * @stable ICU 2.0 / SearchIterator(); /* * Constructor for use by subclasses. * @param text The target text to be searched. * @param breakiter A {@link BreakIterator} that is used to restrict the * points at which matches are detected. If * <tt>handleNext</tt> or <tt>handlePrev</tt> finds a * match, but the match's start or end index is not a * boundary as determined by the <tt>BreakIterator</tt>, * the match is rejected and <tt>handleNext</tt> or * <tt>handlePrev</tt> is called again. If this parameter * is <tt>nullptr</tt>, no break detection is attempted. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 / SearchIterator(const UnicodeString &text, BreakIterator breakiter = nullptr); /** * Constructor for use by subclasses. * <p> * Note: No parsing of the text within the <tt>CharacterIterator</tt> * will be done during searching for this version. The block of text * in <tt>CharacterIterator</tt> will be used as it is. * @param text The target text to be searched. * @param breakiter A {@link BreakIterator} that is used to restrict the * points at which matches are detected. If * <tt>handleNext</tt> or <tt>handlePrev</tt> finds a * match, but the match's start or end index is not a * boundary as determined by the <tt>BreakIterator</tt>, * the match is rejected and <tt>handleNext</tt> or * <tt>handlePrev</tt> is called again. If this parameter * is <tt>nullptr</tt>, no break detection is attempted. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 / SearchIterator(CharacterIterator &text, BreakIterator breakiter = nullptr); // protected methods -------------------------------------------------- /** * Assignment operator. Sets this iterator to have the same behavior, * and iterate over the same text, as the one passed in. * @param that instance to be copied. * @stable ICU 2.0 / SearchIterator & operator=(const SearchIterator &that); /* * Abstract method which subclasses override to provide the mechanism * for finding the next match in the target text. This allows different * subclasses to provide different search algorithms. * <p> * If a match is found, the implementation should return the index at * which the match starts and should call * <tt>setMatchLength</tt> with the number of characters * in the target text that make up the match. If no match is found, the * method should return USEARCH_DONE. * <p> * @param position The index in the target text at which the search * should start. * @param status for error codes if it occurs. * @return index at which the match starts, else if match is not found * USEARCH_DONE is returned * @see #setMatchLength * @stable ICU 2.0 / virtual int32_t handleNext(int32_t position, UErrorCode &status) = 0; /* * Abstract method which subclasses override to provide the mechanism for * finding the previous match in the target text. This allows different * subclasses to provide different search algorithms. * <p> * If a match is found, the implementation should return the index at * which the match starts and should call * <tt>setMatchLength</tt> with the number of characters * in the target text that make up the match. If no match is found, the * method should return USEARCH_DONE. * <p> * @param position The index in the target text at which the search * should start. * @param status for error codes if it occurs. * @return index at which the match starts, else if match is not found * USEARCH_DONE is returned * @see #setMatchLength * @stable ICU 2.0 / virtual int32_t handlePrev(int32_t position, UErrorCode &status) = 0; /* * Sets the length of the currently matched string in the text string to * be searched. * Subclasses' <tt>handleNext</tt> and <tt>handlePrev</tt> * methods should call this when they find a match in the target text. * @param length length of the matched text. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 / virtual void setMatchLength(int32_t length); /* * Sets the offset of the currently matched string in the text string to * be searched. * Subclasses' <tt>handleNext</tt> and <tt>handlePrev</tt> * methods should call this when they find a match in the target text. * @param position start offset of the matched text. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 / virtual void setMatchStart(int32_t position); /* * sets match not found * @stable ICU 2.0 / void setMatchNotFound(); }; inline bool SearchIterator::operator!=(const SearchIterator &that) const { return !operator==(that); } U_NAMESPACE_END #endif / #if !UCONFIG_NO_COLLATION / #endif / U_SHOW_CPLUSPLUS_API */ #endif Back

Edit File : search.h | Size : 22.24 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (C) 2001-2011 IBM and others. All rights reserved.
**********************************************************************
*   Date        Name        Description
*  03/22/2000   helena      Creation.
**********************************************************************
*/

#ifndef SEARCH_H
#define SEARCH_H

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

/**
 * \file 
 * \brief C++ API: SearchIterator object.
 */
 
#if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION

#include "unicode/uobject.h"
#include "unicode/unistr.h"
#include "unicode/chariter.h"
#include "unicode/brkiter.h"
#include "unicode/usearch.h"

/**
* @stable ICU 2.0
*/
struct USearch;
/**
* @stable ICU 2.0
*/
typedef struct USearch USearch;

U_NAMESPACE_BEGIN

/**
 *
 * <tt>SearchIterator</tt> is an abstract base class that provides 
 * methods to search for a pattern within a text string. Instances of
 * <tt>SearchIterator</tt> maintain a current position and scans over the 
 * target text, returning the indices the pattern is matched and the length 
 * of each match.
 * 
 * <tt>SearchIterator</tt> defines a protocol for text searching. 
 * Subclasses provide concrete implementations of various search algorithms. 
 * For example, <tt>StringSearch</tt> implements language-sensitive pattern 
 * matching based on the comparison rules defined in a 
 * <tt>RuleBasedCollator</tt> object. 
 * 
 * Other options for searching includes using a BreakIterator to restrict 
 * the points at which matches are detected.
 * 
 * <tt>SearchIterator</tt> provides an API that is similar to that of
 * other text iteration classes such as <tt>BreakIterator</tt>. Using 
 * this class, it is easy to scan through text looking for all occurrences of 
 * a given pattern. The following example uses a <tt>StringSearch</tt> 
 * object to find all instances of "fox" in the target string. Any other 
 * subclass of <tt>SearchIterator</tt> can be used in an identical 
 * manner.
 * <pre><code>
 * UnicodeString target("The quick brown fox jumped over the lazy fox");
 * UnicodeString pattern("fox");
 *
 * SearchIterator *iter = new StringSearch(pattern, target);
 * UErrorCode error = U_ZERO_ERROR;
 * for (int pos = iter->first(error); pos != USEARCH_DONE; 
 * pos = iter->next(error)) {
 * printf("Found match at %d pos, length is %d\n", pos, iter.getMatchedLength());
 * }
 * </code></pre>
 *
 * @see StringSearch
 * @see RuleBasedCollator
 */
class U_I18N_API SearchIterator : public UObject {

public:

// public constructors and destructors -------------------------------

/** 
    * Copy constructor that creates a SearchIterator instance with the same 
    * behavior, and iterating over the same text. 
    * @param other the SearchIterator instance to be copied.
    * @stable ICU 2.0
    */
    SearchIterator(const SearchIterator &other);

/**
     * Destructor. Cleans up the search iterator data struct.
     * @stable ICU 2.0
     */
    virtual ~SearchIterator();

// public get and set methods ----------------------------------------

/**
 * Sets the index to point to the given position, and clears any state 
 * that's affected.
 * 
 * This method takes the argument index and sets the position in the text 
 * string accordingly without checking if the index is pointing to a 
 * valid starting point to begin searching. 
 * @param position within the text to be set. If position is less
 * than or greater than the text range for searching, 
 * an U_INDEX_OUTOFBOUNDS_ERROR will be returned
 * @param status for errors if it occurs
 * @stable ICU 2.0
 */
 virtual void setOffset(int32_t position, UErrorCode &status) = 0;

/**
     * Return the current index in the text being searched.
     * If the iteration has gone past the end of the text
     * (or past the beginning for a backwards search), USEARCH_DONE
     * is returned.
     * @return current index in the text being searched.
     * @stable ICU 2.0
     */
    virtual int32_t getOffset(void) const = 0;

/**
    * Sets the text searching attributes located in the enum 
    * USearchAttribute with values from the enum USearchAttributeValue.
    * USEARCH_DEFAULT can be used for all attributes for resetting.
    * @param attribute text attribute (enum USearchAttribute) to be set
    * @param value text attribute value
    * @param status for errors if it occurs
    * @stable ICU 2.0
    */
    void setAttribute(USearchAttribute       attribute,
                      USearchAttributeValue  value,
                      UErrorCode            &status);

/** 
 * Gets the text searching attributes
 * @param attribute text attribute (enum USearchAttribute) to be retrieve
 * @return text attribute value
 * @stable ICU 2.0
 */
 USearchAttributeValue getAttribute(USearchAttribute attribute) const;
 
 /**
 * Returns the index to the match in the text string that was searched.
 * This call returns a valid result only after a successful call to 
 * <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>.
 * Just after construction, or after a searching method returns 
 * <tt>USEARCH_DONE</tt>, this method will return <tt>USEARCH_DONE</tt>.
 * 
 * Use getMatchedLength to get the matched string length.
 * @return index of a substring within the text string that is being 
 * searched.
 * @see #first
 * @see #next
 * @see #previous
 * @see #last
 * @stable ICU 2.0
 */
 int32_t getMatchedStart(void) const;

/**
 * Returns the length of text in the string which matches the search 
 * pattern. This call returns a valid result only after a successful call 
 * to <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>.
 * Just after construction, or after a searching method returns 
 * <tt>USEARCH_DONE</tt>, this method will return 0.
 * @return The length of the match in the target text, or 0 if there
 * is no match currently.
 * @see #first
 * @see #next
 * @see #previous
 * @see #last
 * @stable ICU 2.0
 */
 int32_t getMatchedLength(void) const;
 
 /**
 * Returns the text that was matched by the most recent call to 
 * <tt>first</tt>, <tt>next</tt>, <tt>previous</tt>, or <tt>last</tt>.
 * If the iterator is not pointing at a valid match (e.g. just after 
 * construction or after <tt>USEARCH_DONE</tt> has been returned, 
 * returns an empty string. 
 * @param result stores the matched string or an empty string if a match
 * is not found.
 * @see #first
 * @see #next
 * @see #previous
 * @see #last
 * @stable ICU 2.0
 */
 void getMatchedText(UnicodeString &result) const;
 
 /**
 * Set the BreakIterator that will be used to restrict the points
 * at which matches are detected. The user is responsible for deleting 
 * the breakiterator.
 * @param breakiter A BreakIterator that will be used to restrict the 
 * points at which matches are detected. If a match is 
 * found, but the match's start or end index is not a 
 * boundary as determined by the <tt>BreakIterator</tt>, 
 * the match will be rejected and another will be searched 
 * for. If this parameter is <tt>nullptr</tt>, no break
 * detection is attempted.
 * @param status for errors if it occurs
 * @see BreakIterator
 * @stable ICU 2.0
 */
 void setBreakIterator(BreakIterator *breakiter, UErrorCode &status);
 
 /**
 * Returns the BreakIterator that is used to restrict the points at 
 * which matches are detected. This will be the same object that was 
 * passed to the constructor or to <tt>setBreakIterator</tt>.
 * Note that <tt>nullptr</tt> is a legal value; it means that break
 * detection should not be attempted.
 * @return BreakIterator used to restrict matchings.
 * @see #setBreakIterator
 * @stable ICU 2.0
 */
 const BreakIterator * getBreakIterator(void) const;

/**
     * Set the string text to be searched. Text iteration will hence begin at 
     * the start of the text string. This method is useful if you want to 
     * re-use an iterator to search for the same pattern within a different 
     * body of text. The user is responsible for deleting the text.
     * @param text string to be searched.
     * @param status for errors. If the text length is 0, 
     *        an U_ILLEGAL_ARGUMENT_ERROR is returned.
     * @stable ICU 2.0
     */
    virtual void setText(const UnicodeString &text, UErrorCode &status);

/**
 * Set the string text to be searched. Text iteration will hence begin at 
 * the start of the text string. This method is useful if you want to 
 * re-use an iterator to search for the same pattern within a different 
 * body of text.
 * 
 * Note: No parsing of the text within the <tt>CharacterIterator</tt> 
 * will be done during searching for this version. The block of text 
 * in <tt>CharacterIterator</tt> will be used as it is.
 * The user is responsible for deleting the text.
 * @param text string iterator to be searched.
 * @param status for errors if any. If the text length is 0 then an 
 * U_ILLEGAL_ARGUMENT_ERROR is returned.
 * @stable ICU 2.0
 */
 virtual void setText(CharacterIterator &text, UErrorCode &status);
 
 /**
 * Return the string text to be searched.
 * @return text string to be searched.
 * @stable ICU 2.0
 */
 const UnicodeString & getText(void) const;

// operator overloading ----------------------------------------------

/**
     * Equality operator. 
     * @param that SearchIterator instance to be compared.
     * @return true if both BreakIterators are of the same class, have the 
     *         same behavior, terates over the same text and have the same
     *         attributes. false otherwise.
     * @stable ICU 2.0
     */
    virtual bool operator==(const SearchIterator &that) const;

/**
     * Not-equal operator. 
     * @param that SearchIterator instance to be compared.
     * @return false if operator== returns true, and vice versa.
     * @stable ICU 2.0
     */
    bool operator!=(const SearchIterator &that) const;

// public methods ----------------------------------------------------

/**
     * Returns a copy of SearchIterator with the same behavior, and 
     * iterating over the same text, as this one. Note that all data will be
     * replicated, except for the text string to be searched.
     * @return cloned object
     * @stable ICU 2.0
     */
    virtual SearchIterator* safeClone(void) const = 0;

/**
 * Returns the first index at which the string text matches the search 
 * pattern. The iterator is adjusted so that its current index (as 
 * returned by <tt>getOffset</tt>) is the match position if one 
 * was found.
 * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
 * the iterator will be adjusted to the index USEARCH_DONE
 * @param status for errors if it occurs
 * @return The character index of the first match, or 
 * <tt>USEARCH_DONE</tt> if there are no matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t first(UErrorCode &status);

/**
 * Returns the first index equal or greater than <tt>position</tt> at which the 
 * string text matches the search pattern. The iterator is adjusted so 
 * that its current index (as returned by <tt>getOffset</tt>) is the 
 * match position if one was found.
 * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and the
 * iterator will be adjusted to the index <tt>USEARCH_DONE</tt>.
 * @param position where search if to start from. If position is less
 * than or greater than the text range for searching, 
 * an U_INDEX_OUTOFBOUNDS_ERROR will be returned
 * @param status for errors if it occurs
 * @return The character index of the first match following 
 * <tt>position</tt>, or <tt>USEARCH_DONE</tt> if there are no 
 * matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t following(int32_t position, UErrorCode &status);
 
 /**
 * Returns the last index in the target text at which it matches the 
 * search pattern. The iterator is adjusted so that its current index 
 * (as returned by <tt>getOffset</tt>) is the match position if one was 
 * found.
 * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
 * the iterator will be adjusted to the index USEARCH_DONE.
 * @param status for errors if it occurs
 * @return The index of the first match, or <tt>USEARCH_DONE</tt> if 
 * there are no matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t last(UErrorCode &status);

/**
 * Returns the first index less than <tt>position</tt> at which the string 
 * text matches the search pattern. The iterator is adjusted so that its 
 * current index (as returned by <tt>getOffset</tt>) is the match 
 * position if one was found. If a match is not found, 
 * <tt>USEARCH_DONE</tt> will be returned and the iterator will be 
 * adjusted to the index USEARCH_DONE
 * 
 * When <tt>USEARCH_OVERLAP</tt> option is off, the last index of the
 * result match is always less than <tt>position</tt>.
 * When <tt>USERARCH_OVERLAP</tt> is on, the result match may span across
 * <tt>position</tt>.
 *
 * @param position where search is to start from. If position is less
 * than or greater than the text range for searching, 
 * an U_INDEX_OUTOFBOUNDS_ERROR will be returned
 * @param status for errors if it occurs
 * @return The character index of the first match preceding 
 * <tt>position</tt>, or <tt>USEARCH_DONE</tt> if there are 
 * no matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t preceding(int32_t position, UErrorCode &status);

/**
 * Returns the index of the next point at which the text matches the
 * search pattern, starting from the current position
 * The iterator is adjusted so that its current index (as returned by 
 * <tt>getOffset</tt>) is the match position if one was found.
 * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
 * the iterator will be adjusted to a position after the end of the text 
 * string.
 * @param status for errors if it occurs
 * @return The index of the next match after the current position,
 * or <tt>USEARCH_DONE</tt> if there are no more matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t next(UErrorCode &status);

/**
 * Returns the index of the previous point at which the string text 
 * matches the search pattern, starting at the current position.
 * The iterator is adjusted so that its current index (as returned by 
 * <tt>getOffset</tt>) is the match position if one was found.
 * If a match is not found, <tt>USEARCH_DONE</tt> will be returned and
 * the iterator will be adjusted to the index USEARCH_DONE
 * @param status for errors if it occurs
 * @return The index of the previous match before the current position,
 * or <tt>USEARCH_DONE</tt> if there are no more matches.
 * @see #getOffset
 * @stable ICU 2.0
 */
 int32_t previous(UErrorCode &status);

/** 
    * Resets the iteration.
    * Search will begin at the start of the text string if a forward 
    * iteration is initiated before a backwards iteration. Otherwise if a 
    * backwards iteration is initiated before a forwards iteration, the 
    * search will begin at the end of the text string.    
    * @stable ICU 2.0
    */
    virtual void reset();

protected:
    // protected data members ---------------------------------------------

/**
    * C search data struct
    * @stable ICU 2.0
    */
    USearch *m_search_;

/**
    * Break iterator.
    * Currently the C++ breakiterator does not have getRules etc to reproduce
    * another in C. Hence we keep the original around and do the verification
    * at the end of the match. The user is responsible for deleting this
    * break iterator.
    * @stable ICU 2.0
    */
    BreakIterator *m_breakiterator_;
    
    /**
    * Unicode string version of the search text
    * @stable ICU 2.0
    */
    UnicodeString  m_text_;

// protected constructors and destructors -----------------------------

/**
    * Default constructor.
    * Initializes data to the default values.
    * @stable ICU 2.0
    */
    SearchIterator();

/**
 * Constructor for use by subclasses.
 * @param text The target text to be searched.
 * @param breakiter A {@link BreakIterator} that is used to restrict the 
 * points at which matches are detected. If 
 * <tt>handleNext</tt> or <tt>handlePrev</tt> finds a 
 * match, but the match's start or end index is not a 
 * boundary as determined by the <tt>BreakIterator</tt>, 
 * the match is rejected and <tt>handleNext</tt> or 
 * <tt>handlePrev</tt> is called again. If this parameter 
 * is <tt>nullptr</tt>, no break detection is attempted.
 * @see #handleNext
 * @see #handlePrev
 * @stable ICU 2.0
 */
 SearchIterator(const UnicodeString &text, 
 BreakIterator *breakiter = nullptr);

/**
 * Constructor for use by subclasses.
 * 
 * Note: No parsing of the text within the <tt>CharacterIterator</tt> 
 * will be done during searching for this version. The block of text 
 * in <tt>CharacterIterator</tt> will be used as it is.
 * @param text The target text to be searched.
 * @param breakiter A {@link BreakIterator} that is used to restrict the 
 * points at which matches are detected. If 
 * <tt>handleNext</tt> or <tt>handlePrev</tt> finds a 
 * match, but the match's start or end index is not a 
 * boundary as determined by the <tt>BreakIterator</tt>, 
 * the match is rejected and <tt>handleNext</tt> or 
 * <tt>handlePrev</tt> is called again. If this parameter 
 * is <tt>nullptr</tt>, no break detection is attempted.
 * @see #handleNext
 * @see #handlePrev
 * @stable ICU 2.0
 */
 SearchIterator(CharacterIterator &text, BreakIterator *breakiter = nullptr);

// protected methods --------------------------------------------------

/**
     * Assignment operator. Sets this iterator to have the same behavior,
     * and iterate over the same text, as the one passed in.
     * @param that instance to be copied.
     * @stable ICU 2.0
     */
    SearchIterator & operator=(const SearchIterator &that);

/**
 * Abstract method which subclasses override to provide the mechanism
 * for finding the next match in the target text. This allows different
 * subclasses to provide different search algorithms.
 * 
 * If a match is found, the implementation should return the index at
 * which the match starts and should call 
 * <tt>setMatchLength</tt> with the number of characters 
 * in the target text that make up the match. If no match is found, the 
 * method should return USEARCH_DONE.
 * 
 * @param position The index in the target text at which the search 
 * should start.
 * @param status for error codes if it occurs.
 * @return index at which the match starts, else if match is not found 
 * USEARCH_DONE is returned
 * @see #setMatchLength
 * @stable ICU 2.0
 */
 virtual int32_t handleNext(int32_t position, UErrorCode &status) 
 = 0;

/**
 * Abstract method which subclasses override to provide the mechanism for
 * finding the previous match in the target text. This allows different
 * subclasses to provide different search algorithms.
 * 
 * If a match is found, the implementation should return the index at
 * which the match starts and should call 
 * <tt>setMatchLength</tt> with the number of characters 
 * in the target text that make up the match. If no match is found, the 
 * method should return USEARCH_DONE.
 * 
 * @param position The index in the target text at which the search 
 * should start.
 * @param status for error codes if it occurs.
 * @return index at which the match starts, else if match is not found 
 * USEARCH_DONE is returned
 * @see #setMatchLength
 * @stable ICU 2.0
 */
 virtual int32_t handlePrev(int32_t position, UErrorCode &status) 
 = 0;

/**
 * Sets the length of the currently matched string in the text string to
 * be searched.
 * Subclasses' <tt>handleNext</tt> and <tt>handlePrev</tt>
 * methods should call this when they find a match in the target text.
 * @param length length of the matched text.
 * @see #handleNext
 * @see #handlePrev
 * @stable ICU 2.0
 */
 virtual void setMatchLength(int32_t length);

/**
 * Sets the offset of the currently matched string in the text string to
 * be searched.
 * Subclasses' <tt>handleNext</tt> and <tt>handlePrev</tt>
 * methods should call this when they find a match in the target text.
 * @param position start offset of the matched text.
 * @see #handleNext
 * @see #handlePrev
 * @stable ICU 2.0
 */
 virtual void setMatchStart(int32_t position);

/**
    * sets match not found 
    * @stable ICU 2.0
    */
    void setMatchNotFound();
};

inline bool SearchIterator::operator!=(const SearchIterator &that) const
{
   return !operator==(that); 
}
U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_COLLATION */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif

Back