Gecko [ dallasfobana2023.variationbd.com ]

Name	Size	Permission
alphaindex.h	26.54 KB	-rw-r--r--
appendable.h	8.54 KB	-rw-r--r--
basictz.h	9.99 KB	-rw-r--r--
brkiter.h	27.86 KB	-rw-r--r--
bytestream.h	10.75 KB	-rw-r--r--
bytestrie.h	20.8 KB	-rw-r--r--
bytestriebuilder.h	7.48 KB	-rw-r--r--
calendar.h	106.52 KB	-rw-r--r--
caniter.h	7.47 KB	-rw-r--r--
casemap.h	25.42 KB	-rw-r--r--
char16ptr.h	7.22 KB	-rw-r--r--
chariter.h	24.06 KB	-rw-r--r--
choicfmt.h	24 KB	-rw-r--r--
coleitr.h	13.78 KB	-rw-r--r--
coll.h	56.3 KB	-rw-r--r--
compactdecimalformat.h	6.88 KB	-rw-r--r--
curramt.h	3.67 KB	-rw-r--r--
currpinf.h	7.3 KB	-rw-r--r--
currunit.h	4.02 KB	-rw-r--r--
datefmt.h	40.72 KB	-rw-r--r--
dbbi.h	1.19 KB	-rw-r--r--
dcfmtsym.h	20.94 KB	-rw-r--r--
decimfmt.h	87.54 KB	-rw-r--r--
displayoptions.h	7.08 KB	-rw-r--r--
docmain.h	7.3 KB	-rw-r--r--
dtfmtsym.h	38.23 KB	-rw-r--r--
dtintrv.h	3.85 KB	-rw-r--r--
dtitvfmt.h	49.26 KB	-rw-r--r--
dtitvinf.h	18.63 KB	-rw-r--r--
dtptngen.h	28.64 KB	-rw-r--r--
dtrule.h	8.69 KB	-rw-r--r--
edits.h	20.73 KB	-rw-r--r--
enumset.h	2.08 KB	-rw-r--r--
errorcode.h	4.84 KB	-rw-r--r--
fieldpos.h	8.7 KB	-rw-r--r--
filteredbrk.h	5.37 KB	-rw-r--r--
fmtable.h	24.45 KB	-rw-r--r--
format.h	12.5 KB	-rw-r--r--
formattednumber.h	6.15 KB	-rw-r--r--
formattedvalue.h	9.75 KB	-rw-r--r--
fpositer.h	3.03 KB	-rw-r--r--
gender.h	3.35 KB	-rw-r--r--
gregocal.h	30.03 KB	-rw-r--r--
icudataver.h	1.02 KB	-rw-r--r--
icuplug.h	12.1 KB	-rw-r--r--
idna.h	12.71 KB	-rw-r--r--
listformatter.h	8.59 KB	-rw-r--r--
localebuilder.h	11.08 KB	-rw-r--r--
localematcher.h	26.83 KB	-rw-r--r--
localpointer.h	19.44 KB	-rw-r--r--
locdspnm.h	7.12 KB	-rw-r--r--
locid.h	48.27 KB	-rw-r--r--
measfmt.h	11.42 KB	-rw-r--r--
measunit.h	107.38 KB	-rw-r--r--
measure.h	4.69 KB	-rw-r--r--
messagepattern.h	33.72 KB	-rw-r--r--
msgfmt.h	44.21 KB	-rw-r--r--
normalizer2.h	34.73 KB	-rw-r--r--
normlzr.h	30.97 KB	-rw-r--r--
nounit.h	2.25 KB	-rw-r--r--
numberformatter.h	90.03 KB	-rw-r--r--
numberrangeformatter.h	25.32 KB	-rw-r--r--
numfmt.h	50.26 KB	-rw-r--r--
numsys.h	7.23 KB	-rw-r--r--
parseerr.h	3.08 KB	-rw-r--r--
parsepos.h	5.57 KB	-rw-r--r--
platform.h	27.8 KB	-rw-r--r--
plurfmt.h	25.25 KB	-rw-r--r--
plurrule.h	20.64 KB	-rw-r--r--
ptypes.h	3.49 KB	-rw-r--r--
putil.h	6.32 KB	-rw-r--r--
rbbi.h	32.07 KB	-rw-r--r--
rbnf.h	49.92 KB	-rw-r--r--
rbtz.h	15.77 KB	-rw-r--r--
regex.h	84.45 KB	-rw-r--r--
region.h	9.2 KB	-rw-r--r--
reldatefmt.h	22.36 KB	-rw-r--r--
rep.h	9.38 KB	-rw-r--r--
resbund.h	18.11 KB	-rw-r--r--
schriter.h	6.1 KB	-rw-r--r--
scientificnumberformatter.h	6.44 KB	-rw-r--r--
search.h	22.24 KB	-rw-r--r--
selfmt.h	14.35 KB	-rw-r--r--
simpleformatter.h	12.6 KB	-rw-r--r--
simplenumberformatter.h	8.88 KB	-rw-r--r--
simpletz.h	45.65 KB	-rw-r--r--
smpdtfmt.h	71.85 KB	-rw-r--r--
sortkey.h	11.19 KB	-rw-r--r--
std_string.h	1.05 KB	-rw-r--r--
strenum.h	9.96 KB	-rw-r--r--
stringoptions.h	5.79 KB	-rw-r--r--
stringpiece.h	10.05 KB	-rw-r--r--
stringtriebuilder.h	15.5 KB	-rw-r--r--
stsearch.h	21.44 KB	-rw-r--r--
symtable.h	4.28 KB	-rw-r--r--
tblcoll.h	36.94 KB	-rw-r--r--
timezone.h	45.67 KB	-rw-r--r--
tmunit.h	3.4 KB	-rw-r--r--
tmutamt.h	4.91 KB	-rw-r--r--
tmutfmt.h	7.42 KB	-rw-r--r--
translit.h	65.83 KB	-rw-r--r--
tzfmt.h	42.96 KB	-rw-r--r--
tznames.h	16.85 KB	-rw-r--r--
tzrule.h	34.86 KB	-rw-r--r--
tztrans.h	6.13 KB	-rw-r--r--
ubidi.h	89.61 KB	-rw-r--r--
ubiditransform.h	12.71 KB	-rw-r--r--
ubrk.h	24.43 KB	-rw-r--r--
ucal.h	64.28 KB	-rw-r--r--
ucasemap.h	15.21 KB	-rw-r--r--
ucat.h	5.35 KB	-rw-r--r--
uchar.h	145.7 KB	-rw-r--r--
ucharstrie.h	22.56 KB	-rw-r--r--
ucharstriebuilder.h	7.48 KB	-rw-r--r--
uchriter.h	13.42 KB	-rw-r--r--
uclean.h	11.21 KB	-rw-r--r--
ucnv.h	83.46 KB	-rw-r--r--
ucnv_cb.h	6.58 KB	-rw-r--r--
ucnv_err.h	20.98 KB	-rw-r--r--
ucnvsel.h	6.24 KB	-rw-r--r--
ucol.h	62.7 KB	-rw-r--r--
ucoleitr.h	9.82 KB	-rw-r--r--
uconfig.h	12.31 KB	-rw-r--r--
ucpmap.h	5.54 KB	-rw-r--r--
ucptrie.h	22.51 KB	-rw-r--r--
ucsdet.h	14.69 KB	-rw-r--r--
ucurr.h	16.72 KB	-rw-r--r--
udat.h	62.36 KB	-rw-r--r--
udata.h	15.63 KB	-rw-r--r--
udateintervalformat.h	11.93 KB	-rw-r--r--
udatpg.h	30.13 KB	-rw-r--r--
udisplaycontext.h	5.94 KB	-rw-r--r--
udisplayoptions.h	8.86 KB	-rw-r--r--
uenum.h	7.79 KB	-rw-r--r--
ufieldpositer.h	4.41 KB	-rw-r--r--
uformattable.h	10.97 KB	-rw-r--r--
uformattednumber.h	8.09 KB	-rw-r--r--
uformattedvalue.h	12.25 KB	-rw-r--r--
ugender.h	2.06 KB	-rw-r--r--
uidna.h	33.43 KB	-rw-r--r--
uiter.h	22.75 KB	-rw-r--r--
uldnames.h	10.48 KB	-rw-r--r--
ulistformatter.h	10.78 KB	-rw-r--r--
uloc.h	54.66 KB	-rw-r--r--
ulocale.h	6.35 KB	-rw-r--r--
ulocbuilder.h	16.72 KB	-rw-r--r--
ulocdata.h	11.3 KB	-rw-r--r--
umachine.h	15 KB	-rw-r--r--
umisc.h	1.34 KB	-rw-r--r--
umsg.h	24.25 KB	-rw-r--r--
umutablecptrie.h	8.3 KB	-rw-r--r--
unifilt.h	4 KB	-rw-r--r--
unifunct.h	4.05 KB	-rw-r--r--
unimatch.h	6.1 KB	-rw-r--r--
unirepl.h	3.38 KB	-rw-r--r--
uniset.h	66.85 KB	-rw-r--r--
unistr.h	171.35 KB	-rw-r--r--
unorm.h	20.55 KB	-rw-r--r--
unorm2.h	25.71 KB	-rw-r--r--
unum.h	55.16 KB	-rw-r--r--
unumberformatter.h	19.68 KB	-rw-r--r--
unumberoptions.h	5.23 KB	-rw-r--r--
unumberrangeformatter.h	15.35 KB	-rw-r--r--
unumsys.h	7.26 KB	-rw-r--r--
uobject.h	10.66 KB	-rw-r--r--
upluralrules.h	8.79 KB	-rw-r--r--
uregex.h	71.99 KB	-rw-r--r--
uregion.h	9.81 KB	-rw-r--r--
ureldatefmt.h	16.98 KB	-rw-r--r--
urename.h	140.82 KB	-rw-r--r--
urep.h	5.38 KB	-rw-r--r--
ures.h	36.65 KB	-rw-r--r--
uscript.h	27.8 KB	-rw-r--r--
usearch.h	39.21 KB	-rw-r--r--
uset.h	45.61 KB	-rw-r--r--
usetiter.h	9.63 KB	-rw-r--r--
ushape.h	18 KB	-rw-r--r--
usimplenumberformatter.h	7.46 KB	-rw-r--r--
uspoof.h	80.32 KB	-rw-r--r--
usprep.h	8.19 KB	-rw-r--r--
ustdio.h	38.56 KB	-rw-r--r--
ustream.h	1.89 KB	-rw-r--r--
ustring.h	72.13 KB	-rw-r--r--
ustringtrie.h	3.15 KB	-rw-r--r--
utext.h	58.1 KB	-rw-r--r--
utf.h	7.87 KB	-rw-r--r--
utf16.h	23.35 KB	-rw-r--r--
utf32.h	763 B	-rw-r--r--
utf8.h	30.83 KB	-rw-r--r--
utf_old.h	45.8 KB	-rw-r--r--
utmscale.h	13.78 KB	-rw-r--r--
utrace.h	17.18 KB	-rw-r--r--
utrans.h	25.54 KB	-rw-r--r--
utypes.h	31.06 KB	-rw-r--r--
uvernum.h	6.33 KB	-rw-r--r--
uversion.h	5.99 KB	-rw-r--r--
vtzone.h	20.69 KB	-rw-r--r--

Code Editor : search.h

// © 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

${this.title}

Code Editor : search.h