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alphaindex.h
26.13
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appendable.h
8.25
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basictz.h
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brkiter.h
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bytestream.h
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bytestrie.h
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bytestriebuilder.h
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calendar.h
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caniter.h
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chariter.h
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choicfmt.h
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coleitr.h
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coll.h
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compactdecimalformat.h
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curramt.h
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currpinf.h
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currunit.h
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datefmt.h
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dbbi.h
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dcfmtsym.h
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decimfmt.h
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docmain.h
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dtfmtsym.h
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dtintrv.h
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dtitvfmt.h
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dtitvinf.h
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dtptngen.h
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dtrule.h
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enumset.h
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errorcode.h
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fieldpos.h
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filteredbrk.h
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fmtable.h
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format.h
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fpositer.h
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gender.h
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gregocal.h
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icudataver.h
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icuplug.h
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idna.h
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listformatter.h
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localpointer.h
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locdspnm.h
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locid.h
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measfmt.h
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measunit.h
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measure.h
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messagepattern.h
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msgfmt.h
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normalizer2.h
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normlzr.h
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numfmt.h
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numsys.h
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parseerr.h
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parsepos.h
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platform.h
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plurfmt.h
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plurrule.h
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ptypes.h
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putil.h
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rbbi.h
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rbnf.h
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rbtz.h
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regex.h
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region.h
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reldatefmt.h
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rep.h
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resbund.h
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schriter.h
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scientificnumberformatter.h
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search.h
22.1
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selfmt.h
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simpleformatter.h
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simpletz.h
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smpdtfmt.h
69.24
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sortkey.h
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std_string.h
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strenum.h
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stringpiece.h
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stringtriebuilder.h
14.56
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stsearch.h
21.18
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symtable.h
4.1
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tblcoll.h
36.24
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timezone.h
40.71
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tmunit.h
2.94
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tmutamt.h
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tmutfmt.h
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translit.h
54.41
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tzfmt.h
42.69
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tznames.h
16.25
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tzrule.h
35.21
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tztrans.h
5.96
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ubidi.h
88.57
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ubrk.h
20.05
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ucal.h
54.18
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ucasemap.h
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ucat.h
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uchar.h
122.74
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ucharstrie.h
20.8
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ucharstriebuilder.h
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uchriter.h
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uclean.h
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ucnv.h
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ucnv_cb.h
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ucnv_err.h
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ucnvsel.h
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ucol.h
60.51
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ucoleitr.h
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uconfig.h
11.76
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ucsdet.h
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ucurr.h
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udat.h
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udata.h
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udateintervalformat.h
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udatpg.h
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udisplaycontext.h
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uenum.h
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ufieldpositer.h
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uformattable.h
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ugender.h
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uidna.h
33.26
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uiter.h
22.67
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uldnames.h
10.34
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ulistformatter.h
4.43
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uloc.h
49.78
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ulocdata.h
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umachine.h
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umisc.h
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umsg.h
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unifilt.h
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unifunct.h
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unimatch.h
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unirepl.h
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uniset.h
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unistr.h
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unorm.h
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unorm2.h
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unum.h
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unumsys.h
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uobject.h
10.61
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upluralrules.h
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uregex.h
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uregion.h
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urename.h
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urep.h
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ures.h
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uscript.h
25.24
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usearch.h
37.71
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uset.h
39.67
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usetiter.h
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ushape.h
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ustring.h
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ustringtrie.h
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utext.h
57.97
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utf.h
7.64
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utf16.h
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utf32.h
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utf8.h
27.62
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utf_old.h
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utmscale.h
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utrace.h
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utrans.h
25.42
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utypes.h
31.05
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uvernum.h
5.62
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uversion.h
6.29
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vtzone.h
20.06
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/* ********************************************************************** * 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" /** * \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 occurances 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.getMatchLength()); * } * </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>NULL</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>NULL</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 UBool 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 */ UBool 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>NULL</tt>, no break detection is attempted. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 */ SearchIterator(const UnicodeString &text, BreakIterator *breakiter = NULL); /** * 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>NULL</tt>, no break detection is attempted. * @see #handleNext * @see #handlePrev * @stable ICU 2.0 */ SearchIterator(CharacterIterator &text, BreakIterator *breakiter = NULL); // 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 UBool SearchIterator::operator!=(const SearchIterator &that) const { return !operator==(that); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_COLLATION */ #endif