ACIL FM

Nama	Ukuran	Aksi
alphaindex.h	26.48 MB	View DL Edit
appendable.h	8.49 MB	View DL Edit
basictz.h	9.27 MB	View DL Edit
brkiter.h	27.8 MB	View DL Edit
bytestream.h	10.78 MB	View DL Edit
bytestrie.h	20.77 MB	View DL Edit
bytestriebuilder.h	7.08 MB	View DL Edit
calendar.h	105.74 MB	View DL Edit
caniter.h	7.43 MB	View DL Edit
casemap.h	25.33 MB	View DL Edit
char16ptr.h	7.22 MB	View DL Edit
chariter.h	24.05 MB	View DL Edit
choicfmt.h	23.91 MB	View DL Edit
coleitr.h	13.76 MB	View DL Edit
coll.h	56.23 MB	View DL Edit
compactdecimalformat.h	6.88 MB	View DL Edit
curramt.h	3.76 MB	View DL Edit
currpinf.h	7.3 MB	View DL Edit
currunit.h	4 MB	View DL Edit
datefmt.h	40.67 MB	View DL Edit
dbbi.h	1.19 MB	View DL Edit
dcfmtsym.h	20.41 MB	View DL Edit
decimfmt.h	87.19 MB	View DL Edit
docmain.h	6.97 MB	View DL Edit
dtfmtsym.h	37.7 MB	View DL Edit
dtintrv.h	3.84 MB	View DL Edit
dtitvfmt.h	46.52 MB	View DL Edit
dtitvinf.h	18.62 MB	View DL Edit
dtptngen.h	25.8 MB	View DL Edit
dtrule.h	8.68 MB	View DL Edit
edits.h	20.74 MB	View DL Edit
enumset.h	2.08 MB	View DL Edit
errorcode.h	4.84 MB	View DL Edit
fieldpos.h	8.69 MB	View DL Edit
filteredbrk.h	5.37 MB	View DL Edit
fmtable.h	24.42 MB	View DL Edit
format.h	12.5 MB	View DL Edit
formattedvalue.h	9.75 MB	View DL Edit
fpositer.h	3.04 MB	View DL Edit
gender.h	3.33 MB	View DL Edit
gregocal.h	31.71 MB	View DL Edit
icudataver.h	1.03 MB	View DL Edit
icuplug.h	11.88 MB	View DL Edit
idna.h	12.7 MB	View DL Edit
listformatter.h	9.27 MB	View DL Edit
localebuilder.h	11.23 MB	View DL Edit
localematcher.h	24.56 MB	View DL Edit
localpointer.h	19.36 MB	View DL Edit
locdspnm.h	7.12 MB	View DL Edit
locid.h	47.68 MB	View DL Edit
measfmt.h	11.33 MB	View DL Edit
measunit.h	95.28 MB	View DL Edit
measure.h	4.32 MB	View DL Edit
messagepattern.h	33.71 MB	View DL Edit
msgfmt.h	44.11 MB	View DL Edit
normalizer2.h	34.03 MB	View DL Edit
normlzr.h	30.94 MB	View DL Edit
nounit.h	2.69 MB	View DL Edit
numberformatter.h	84.25 MB	View DL Edit
numberrangeformatter.h	27.95 MB	View DL Edit
numfmt.h	49.76 MB	View DL Edit
numsys.h	7.32 MB	View DL Edit
parseerr.h	3.08 MB	View DL Edit
parsepos.h	5.56 MB	View DL Edit
platform.h	28.08 MB	View DL Edit
plurfmt.h	25.2 MB	View DL Edit
plurrule.h	18.34 MB	View DL Edit
ptypes.h	3.49 MB	View DL Edit
putil.h	6.33 MB	View DL Edit
rbbi.h	26.58 MB	View DL Edit
rbnf.h	48.73 MB	View DL Edit
rbtz.h	15.6 MB	View DL Edit
regex.h	84.34 MB	View DL Edit
region.h	9.18 MB	View DL Edit
reldatefmt.h	22.27 MB	View DL Edit
rep.h	9.37 MB	View DL Edit
resbund.h	18.07 MB	View DL Edit
schriter.h	6.32 MB	View DL Edit
scientificnumberformatter.h	6.4 MB	View DL Edit
search.h	22.22 MB	View DL Edit
selfmt.h	14.3 MB	View DL Edit
simpleformatter.h	12.59 MB	View DL Edit
simpletz.h	45.44 MB	View DL Edit
smpdtfmt.h	71.01 MB	View DL Edit
sortkey.h	11.18 MB	View DL Edit
std_string.h	1.05 MB	View DL Edit
strenum.h	9.92 MB	View DL Edit
stringoptions.h	5.79 MB	View DL Edit
stringpiece.h	10.35 MB	View DL Edit
stringtriebuilder.h	15.33 MB	View DL Edit
stsearch.h	21.3 MB	View DL Edit
symtable.h	4.27 MB	View DL Edit
tblcoll.h	36.61 MB	View DL Edit
timezone.h	41.02 MB	View DL Edit
tmunit.h	3.38 MB	View DL Edit
tmutamt.h	4.9 MB	View DL Edit
tmutfmt.h	7.85 MB	View DL Edit
translit.h	65.82 MB	View DL Edit
tzfmt.h	42.89 MB	View DL Edit
tznames.h	16.85 MB	View DL Edit
tzrule.h	35.37 MB	View DL Edit
tztrans.h	6.12 MB	View DL Edit
ubidi.h	89.56 MB	View DL Edit
ubiditransform.h	12.65 MB	View DL Edit
ubrk.h	23.97 MB	View DL Edit
ucal.h	56.9 MB	View DL Edit
ucasemap.h	15.18 MB	View DL Edit
ucat.h	5.36 MB	View DL Edit
uchar.h	141.24 MB	View DL Edit
ucharstrie.h	22.58 MB	View DL Edit
ucharstriebuilder.h	7.21 MB	View DL Edit
uchriter.h	13.2 MB	View DL Edit
uclean.h	11.21 MB	View DL Edit
ucnv.h	83.09 MB	View DL Edit
ucnvsel.h	6.14 MB	View DL Edit
ucnv_cb.h	6.59 MB	View DL Edit
ucnv_err.h	20.99 MB	View DL Edit
ucol.h	61.46 MB	View DL Edit
ucoleitr.h	9.46 MB	View DL Edit
uconfig.h	12.07 MB	View DL Edit
ucpmap.h	5.53 MB	View DL Edit
ucptrie.h	22.46 MB	View DL Edit
ucsdet.h	14.67 MB	View DL Edit
ucurr.h	16.12 MB	View DL Edit
udat.h	61.38 MB	View DL Edit
udata.h	15.56 MB	View DL Edit
udateintervalformat.h	10.74 MB	View DL Edit
udatpg.h	26.8 MB	View DL Edit
udisplaycontext.h	5.89 MB	View DL Edit
uenum.h	7.78 MB	View DL Edit
ufieldpositer.h	4.36 MB	View DL Edit
uformattable.h	10.94 MB	View DL Edit
uformattedvalue.h	12.12 MB	View DL Edit
ugender.h	2 MB	View DL Edit
uidna.h	33.37 MB	View DL Edit
uiter.h	22.77 MB	View DL Edit
uldnames.h	10.45 MB	View DL Edit
ulistformatter.h	10.83 MB	View DL Edit
uloc.h	53.16 MB	View DL Edit
ulocdata.h	11.26 MB	View DL Edit
umachine.h	14.54 MB	View DL Edit
umisc.h	1.33 MB	View DL Edit
umsg.h	24.23 MB	View DL Edit
umutablecptrie.h	8.24 MB	View DL Edit
unifilt.h	3.96 MB	View DL Edit
unifunct.h	4.04 MB	View DL Edit
unimatch.h	6.1 MB	View DL Edit
unirepl.h	3.38 MB	View DL Edit
uniset.h	64.9 MB	View DL Edit
unistr.h	170.43 MB	View DL Edit
unorm.h	20.52 MB	View DL Edit
unorm2.h	24.66 MB	View DL Edit
unum.h	53.46 MB	View DL Edit
unumberformatter.h	25.22 MB	View DL Edit
unumsys.h	7.21 MB	View DL Edit
uobject.h	10.68 MB	View DL Edit
upluralrules.h	7.83 MB	View DL Edit
uregex.h	72.05 MB	View DL Edit
uregion.h	9.84 MB	View DL Edit
ureldatefmt.h	17 MB	View DL Edit
urename.h	131.3 MB	View DL Edit
urep.h	5.38 MB	View DL Edit
ures.h	36.54 MB	View DL Edit
uscript.h	27.21 MB	View DL Edit
usearch.h	38.12 MB	View DL Edit
uset.h	40 MB	View DL Edit
usetiter.h	9.55 MB	View DL Edit
ushape.h	18 MB	View DL Edit
uspoof.h	65.9 MB	View DL Edit
usprep.h	8.14 MB	View DL Edit
ustdio.h	38.54 MB	View DL Edit
ustream.h	1.89 MB	View DL Edit
ustring.h	72.47 MB	View DL Edit
ustringtrie.h	3.15 MB	View DL Edit
utext.h	58.13 MB	View DL Edit
utf.h	7.86 MB	View DL Edit
utf8.h	30.96 MB	View DL Edit
utf16.h	23.32 MB	View DL Edit
utf32.h	763 B	View DL Edit
utf_old.h	45.83 MB	View DL Edit
utmscale.h	13.78 MB	View DL Edit
utrace.h	17.29 MB	View DL Edit
utrans.h	25.52 MB	View DL Edit
utypes.h	30.74 MB	View DL Edit
uvernum.h	6.67 MB	View DL Edit
uversion.h	6 MB	View DL Edit
vtzone.h	20.3 MB	View DL Edit

Edit file: /usr/include/unicode/usearch.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (C) 2001-2011,2014 IBM and others. All rights reserved.
**********************************************************************
*   Date        Name        Description
*  06/28/2001   synwee      Creation.
**********************************************************************
*/
#ifndef USEARCH_H
#define USEARCH_H

#include "unicode/utypes.h"

#if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION

#include "unicode/localpointer.h"
#include "unicode/ucol.h"
#include "unicode/ucoleitr.h"
#include "unicode/ubrk.h"

/**
 * \file
 * \brief C API: StringSearch
 *
 * C APIs for an engine that provides language-sensitive text searching based 
 * on the comparison rules defined in a <tt>UCollator</tt> data struct,
 * see <tt>ucol.h</tt>. This ensures that language eccentricity can be 
 * handled, e.g. for the German collator, characters &szlig; and SS will be matched 
 * if case is chosen to be ignored. 
 * See the <a href="http://source.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm">
 * "ICU Collation Design Document"</a> for more information.
 * 
 * The implementation may use a linear search or a modified form of the Boyer-Moore
 * search; for more information on the latter see 
 * <a href="http://icu-project.org/docs/papers/efficient_text_searching_in_java.html">
 * "Efficient Text Searching in Java"</a>, published in Java Report 
 * in February, 1999.
 * 
 * There are 2 match options for selection: 
 * Let S' be the sub-string of a text string S between the offsets start and 
 * end <start, end>.
 * 
 * A pattern string P matches a text string S at the offsets <start, end> 
 * if
 * <pre> 
 * option 1. Some canonical equivalent of P matches some canonical equivalent 
 * of S'
 * option 2. P matches S' and if P starts or ends with a combining mark, 
 * there exists no non-ignorable combining mark before or after S' 
 * in S respectively. 
 * </pre>
 * Option 2. will be the default.
 * 
 * This search has APIs similar to that of other text iteration mechanisms 
 * such as the break iterators in <tt>ubrk.h</tt>. Using these 
 * APIs, it is easy to scan through text looking for all occurrences of 
 * a given pattern. This search iterator allows changing of direction by 
 * calling a <tt>reset</tt> followed by a <tt>next</tt> or <tt>previous</tt>. 
 * Though a direction change can occur without calling <tt>reset</tt> first, 
 * this operation comes with some speed penalty.
 * Generally, match results in the forward direction will match the result 
 * matches in the backwards direction in the reverse order
 * 
 * <tt>usearch.h</tt> provides APIs to specify the starting position 
 * within the text string to be searched, e.g. <tt>usearch_setOffset</tt>,
 * <tt>usearch_preceding</tt> and <tt>usearch_following</tt>. Since the 
 * starting position will be set as it is specified, please take note that 
 * there are some dangerous positions which the search may render incorrect 
 * results:
 * <ul>
 * <li> The midst of a substring that requires normalization.
 * <li> If the following match is to be found, the position should not be the
 * second character which requires to be swapped with the preceding 
 * character. Vice versa, if the preceding match is to be found, 
 * position to search from should not be the first character which 
 * requires to be swapped with the next character. E.g certain Thai and
 * Lao characters require swapping.
 * <li> If a following pattern match is to be found, any position within a 
 * contracting sequence except the first will fail. Vice versa if a 
 * preceding pattern match is to be found, a invalid starting point 
 * would be any character within a contracting sequence except the last.
 * </ul>
 * 
 * A breakiterator can be used if only matches at logical breaks are desired.
 * Using a breakiterator will only give you results that exactly matches the
 * boundaries given by the breakiterator. For instance the pattern "e" will
 * not be found in the string "\u00e9" if a character break iterator is used.
 * 
 * Options are provided to handle overlapping matches. 
 * E.g. In English, overlapping matches produces the result 0 and 2 
 * for the pattern "abab" in the text "ababab", where else mutually 
 * exclusive matches only produce the result of 0.
 * 
 * Options are also provided to implement "asymmetric search" as described in
 * <a href="http://www.unicode.org/reports/tr10/#Asymmetric_Search">
 * UTS #10 Unicode Collation Algorithm</a>, specifically the USearchAttribute
 * USEARCH_ELEMENT_COMPARISON and its values.
 * 
 * Though collator attributes will be taken into consideration while 
 * performing matches, there are no APIs here for setting and getting the 
 * attributes. These attributes can be set by getting the collator
 * from <tt>usearch_getCollator</tt> and using the APIs in <tt>ucol.h</tt>.
 * Lastly to update String Search to the new collator attributes, 
 * usearch_reset() has to be called.
 * 
 * Restriction: 
 * Currently there are no composite characters that consists of a
 * character with combining class > 0 before a character with combining 
 * class == 0. However, if such a character exists in the future, the 
 * search mechanism does not guarantee the results for option 1.
 * 
 * 
 * Example of use: 
 * <pre><code>
 * char *tgtstr = "The quick brown fox jumped over the lazy fox";
 * char *patstr = "fox";
 * UChar target[64];
 * UChar pattern[16];
 * UErrorCode status = U_ZERO_ERROR;
 * u_uastrcpy(target, tgtstr);
 * u_uastrcpy(pattern, patstr);
 *
 * UStringSearch *search = usearch_open(pattern, -1, target, -1, "en_US", 
 * NULL, &status);
 * if (U_SUCCESS(status)) {
 * for (int pos = usearch_first(search, &status); 
 * pos != USEARCH_DONE; 
 * pos = usearch_next(search, &status))
 * {
 * printf("Found match at %d pos, length is %d\n", pos, 
 * usearch_getMatchedLength(search));
 * }
 * }
 *
 * usearch_close(search);
 * </code></pre>
 * @stable ICU 2.4
 */

/**
* DONE is returned by previous() and next() after all valid matches have 
* been returned, and by first() and last() if there are no matches at all.
* @stable ICU 2.4
*/
#define USEARCH_DONE -1

/**
* Data structure for searching
* @stable ICU 2.4
*/
struct UStringSearch;
/**
* Data structure for searching
* @stable ICU 2.4
*/
typedef struct UStringSearch UStringSearch;

/**
* @stable ICU 2.4
*/
typedef enum {
    /**
     * Option for overlapping matches
     * @stable ICU 2.4
     */
    USEARCH_OVERLAP = 0,
#ifndef U_HIDE_DEPRECATED_API
    /** 
     * Option for canonical matches; option 1 in header documentation.
     * The default value will be USEARCH_OFF.
     * Note: Setting this option to USEARCH_ON currently has no effect on
     * search behavior, and this option is deprecated. Instead, to control
     * canonical match behavior, you must set UCOL_NORMALIZATION_MODE
     * appropriately (to UCOL_OFF or UCOL_ON) in the UCollator used by
     * the UStringSearch object.
     * @see usearch_openFromCollator 
     * @see usearch_getCollator
     * @see usearch_setCollator
     * @see ucol_getAttribute
     * @deprecated ICU 53
     */
    USEARCH_CANONICAL_MATCH = 1,
#endif  /* U_HIDE_DEPRECATED_API */
    /** 
     * Option to control how collation elements are compared.
     * The default value will be USEARCH_STANDARD_ELEMENT_COMPARISON.
     * @stable ICU 4.4
     */
    USEARCH_ELEMENT_COMPARISON = 2,

#ifndef U_HIDE_DEPRECATED_API
    /**
     * One more than the highest normal USearchAttribute value.
     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
     */
    USEARCH_ATTRIBUTE_COUNT = 3
#endif  /* U_HIDE_DEPRECATED_API */
} USearchAttribute;

/**
* @stable ICU 2.4
*/
typedef enum {
 /** 
 * Default value for any USearchAttribute
 * @stable ICU 2.4
 */
 USEARCH_DEFAULT = -1,
 /**
 * Value for USEARCH_OVERLAP and USEARCH_CANONICAL_MATCH
 * @stable ICU 2.4
 */
 USEARCH_OFF, 
 /**
 * Value for USEARCH_OVERLAP and USEARCH_CANONICAL_MATCH
 * @stable ICU 2.4
 */
 USEARCH_ON,
 /** 
 * Value (default) for USEARCH_ELEMENT_COMPARISON;
 * standard collation element comparison at the specified collator
 * strength.
 * @stable ICU 4.4
 */
 USEARCH_STANDARD_ELEMENT_COMPARISON,
 /** 
 * Value for USEARCH_ELEMENT_COMPARISON;
 * collation element comparison is modified to effectively provide
 * behavior between the specified strength and strength - 1. Collation
 * elements in the pattern that have the base weight for the specified
 * strength are treated as "wildcards" that match an element with any
 * other weight at that collation level in the searched text. For
 * example, with a secondary-strength English collator, a plain 'e' in
 * the pattern will match a plain e or an e with any diacritic in the
 * searched text, but an e with diacritic in the pattern will only
 * match an e with the same diacritic in the searched text.
 *
 * This supports "asymmetric search" as described in
 * <a href="http://www.unicode.org/reports/tr10/#Asymmetric_Search">
 * UTS #10 Unicode Collation Algorithm</a>.
 *
 * @stable ICU 4.4
 */
 USEARCH_PATTERN_BASE_WEIGHT_IS_WILDCARD,
 /** 
 * Value for USEARCH_ELEMENT_COMPARISON.
 * collation element comparison is modified to effectively provide
 * behavior between the specified strength and strength - 1. Collation
 * elements in either the pattern or the searched text that have the
 * base weight for the specified strength are treated as "wildcards"
 * that match an element with any other weight at that collation level.
 * For example, with a secondary-strength English collator, a plain 'e'
 * in the pattern will match a plain e or an e with any diacritic in the
 * searched text, but an e with diacritic in the pattern will only
 * match an e with the same diacritic or a plain e in the searched text.
 *
 * This option is similar to "asymmetric search" as described in
 * [UTS #10 Unicode Collation Algorithm](http://www.unicode.org/reports/tr10/#Asymmetric_Search),
 * but also allows unmarked characters in the searched text to match
 * marked or unmarked versions of that character in the pattern.
 *
 * @stable ICU 4.4
 */
 USEARCH_ANY_BASE_WEIGHT_IS_WILDCARD,

#ifndef U_HIDE_DEPRECATED_API
    /**
     * One more than the highest normal USearchAttributeValue value.
     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
     */
    USEARCH_ATTRIBUTE_VALUE_COUNT
#endif  /* U_HIDE_DEPRECATED_API */
} USearchAttributeValue;

/* open and close ------------------------------------------------------ */

/**
* Creating a search iterator data struct using the argument locale language
* rule set. A collator will be created in the process, which will be owned by
* this search and will be deleted in <tt>usearch_close</tt>.
* @param pattern for matching
* @param patternlength length of the pattern, -1 for null-termination
* @param text text string
* @param textlength length of the text string, -1 for null-termination
* @param locale name of locale for the rules to be used
* @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. If pattern or text is NULL, or if
* patternlength or textlength is 0 then an 
* U_ILLEGAL_ARGUMENT_ERROR is returned.
* @return search iterator data structure, or NULL if there is an error.
* @stable ICU 2.4
*/
U_STABLE UStringSearch * U_EXPORT2 usearch_open(const UChar *pattern, 
 int32_t patternlength, 
 const UChar *text, 
 int32_t textlength,
 const char *locale,
 UBreakIterator *breakiter,
 UErrorCode *status);

/**
* Creating a search iterator data struct using the argument collator language
* rule set. Note, user retains the ownership of this collator, thus the 
* responsibility of deletion lies with the user.
* NOTE: string search cannot be instantiated from a collator that has 
* collate digits as numbers (CODAN) turned on.
* @param pattern for matching
* @param patternlength length of the pattern, -1 for null-termination
* @param text text string
* @param textlength length of the text string, -1 for null-termination
* @param collator used for the language rules
* @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. If collator, pattern or text is NULL, 
* or if patternlength or textlength is 0 then an 
* U_ILLEGAL_ARGUMENT_ERROR is returned.
* @return search iterator data structure, or NULL if there is an error.
* @stable ICU 2.4
*/
U_STABLE UStringSearch * U_EXPORT2 usearch_openFromCollator(
 const UChar *pattern, 
 int32_t patternlength,
 const UChar *text, 
 int32_t textlength,
 const UCollator *collator,
 UBreakIterator *breakiter,
 UErrorCode *status);

/**
* Destroying and cleaning up the search iterator data struct.
* If a collator is created in <tt>usearch_open</tt>, it will be destroyed here.
* @param searchiter data struct to clean up
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_close(UStringSearch *searchiter);

#if U_SHOW_CPLUSPLUS_API

U_NAMESPACE_BEGIN

/**
 * \class LocalUStringSearchPointer
 * "Smart pointer" class, closes a UStringSearch via usearch_close().
 * For most methods see the LocalPointerBase base class.
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @stable ICU 4.4
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUStringSearchPointer, UStringSearch, usearch_close);

U_NAMESPACE_END

#endif

/* get and set methods -------------------------------------------------- */

/**
* Sets the current position in the text string which the next search will 
* start from. Clears previous states. 
* 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. 
* Search positions that may render incorrect results are highlighted in the
* header comments
* @param strsrch search iterator data struct
* @param position position to start next search from. If position is less
*          than or greater than the text range for searching, 
*          an U_INDEX_OUTOFBOUNDS_ERROR will be returned
* @param status error status if any.
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setOffset(UStringSearch *strsrch, 
                                        int32_t    position,
                                        UErrorCode    *status);

/**
* Return the current index in the string text being searched.
* If the iteration has gone past the end of the text (or past the beginning 
* for a backwards search), <tt>USEARCH_DONE</tt> is returned.
* @param strsrch search iterator data struct
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getOffset(const UStringSearch *strsrch);
 
/**
* Sets the text searching attributes located in the enum USearchAttribute
* with values from the enum USearchAttributeValue.
* <tt>USEARCH_DEFAULT</tt> can be used for all attributes for resetting.
* @param strsrch search iterator data struct
* @param attribute text attribute to be set
* @param value text attribute value
* @param status for errors if it occurs
* @see #usearch_getAttribute
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setAttribute(UStringSearch *strsrch, 
 USearchAttribute attribute,
 USearchAttributeValue value,
 UErrorCode *status);

/**    
* Gets the text searching attributes.
* @param strsrch search iterator data struct
* @param attribute text attribute to be retrieve
* @return text attribute value
* @see #usearch_setAttribute
* @stable ICU 2.4
*/
U_STABLE USearchAttributeValue U_EXPORT2 usearch_getAttribute(
                                         const UStringSearch    *strsrch,
                                               USearchAttribute  attribute);

/**
* 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>usearch_first</tt>, <tt>usearch_next</tt>, <tt>usearch_previous</tt>, 
* or <tt>usearch_last</tt>.
* Just after construction, or after a searching method returns 
* <tt>USEARCH_DONE</tt>, this method will return <tt>USEARCH_DONE</tt>.
* 
* Use <tt>usearch_getMatchedLength</tt> to get the matched string length.
* @param strsrch search iterator data struct
* @return index to a substring within the text string that is being 
* searched.
* @see #usearch_first
* @see #usearch_next
* @see #usearch_previous
* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedStart(
 const UStringSearch *strsrch);
 
/**
* 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>usearch_first</tt>, <tt>usearch_next</tt>, <tt>usearch_previous</tt>, 
* or <tt>usearch_last</tt>.
* Just after construction, or after a searching method returns 
* <tt>USEARCH_DONE</tt>, this method will return 0.
* @param strsrch search iterator data struct
* @return The length of the match in the string text, or 0 if there is no 
* match currently.
* @see #usearch_first
* @see #usearch_next
* @see #usearch_previous
* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedLength(
 const UStringSearch *strsrch);

/**
* Returns the text that was matched by the most recent call to 
* <tt>usearch_first</tt>, <tt>usearch_next</tt>, <tt>usearch_previous</tt>, 
* or <tt>usearch_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. If result is not large enough to store the matched text,
* result will be filled with the partial text and an U_BUFFER_OVERFLOW_ERROR 
* will be returned in status. result will be null-terminated whenever 
* possible. If the buffer fits the matched text exactly, a null-termination 
* is not possible, then a U_STRING_NOT_TERMINATED_ERROR set in status.
* Pre-flighting can be either done with length = 0 or the API 
* <tt>usearch_getMatchedLength</tt>.
* @param strsrch search iterator data struct
* @param result UChar buffer to store the matched string
* @param resultCapacity length of the result buffer
* @param status error returned if result is not large enough
* @return exact length of the matched text, not counting the null-termination
* @see #usearch_first
* @see #usearch_next
* @see #usearch_previous
* @see #usearch_last
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_getMatchedText(const UStringSearch *strsrch, 
 UChar *result, 
 int32_t resultCapacity, 
 UErrorCode *status);

#if !UCONFIG_NO_BREAK_ITERATION

/**
* Set the BreakIterator that will be used to restrict the points at which 
* matches are detected.
* @param strsrch search iterator data struct
* @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 #usearch_getBreakIterator
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setBreakIterator(UStringSearch *strsrch, 
 UBreakIterator *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>usearch_setBreakIterator</tt>. Note that 
* <tt>NULL</tt> 
* is a legal value; it means that break detection should not be attempted.
* @param strsrch search iterator data struct
* @return break iterator used
* @see #usearch_setBreakIterator
* @stable ICU 2.4
*/
U_STABLE const UBreakIterator * U_EXPORT2 usearch_getBreakIterator(
 const UStringSearch *strsrch);
 
#endif
 
/**
* 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.
* @param strsrch search iterator data struct
* @param text new string to look for match
* @param textlength length of the new string, -1 for null-termination
* @param status for errors if it occurs. If text is NULL, or textlength is 0 
* then an U_ILLEGAL_ARGUMENT_ERROR is returned with no change
* done to strsrch.
* @see #usearch_getText
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setText( UStringSearch *strsrch, 
 const UChar *text,
 int32_t textlength,
 UErrorCode *status);

/**
* Return the string text to be searched.
* @param strsrch search iterator data struct
* @param length returned string text length
* @return string text 
* @see #usearch_setText
* @stable ICU 2.4
*/
U_STABLE const UChar * U_EXPORT2 usearch_getText(const UStringSearch *strsrch, 
                                               int32_t       *length);

/**
* Gets the collator used for the language rules. 
* 
* Deleting the returned <tt>UCollator</tt> before calling 
* <tt>usearch_close</tt> would cause the string search to fail.
* <tt>usearch_close</tt> will delete the collator if this search owns it.
* @param strsrch search iterator data struct
* @return collator
* @stable ICU 2.4
*/
U_STABLE UCollator * U_EXPORT2 usearch_getCollator(
 const UStringSearch *strsrch);

/**
* Sets the collator used for the language rules. User retains the ownership 
* of this collator, thus the responsibility of deletion lies with the user.
* This method causes internal data such as Boyer-Moore shift tables to  
* be recalculated, but the iterator's position is unchanged.
* @param strsrch search iterator data struct
* @param collator to be used
* @param status for errors if it occurs
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setCollator(      UStringSearch *strsrch, 
                                          const UCollator     *collator,
                                                UErrorCode    *status);

/**
* Sets the pattern used for matching.
* Internal data like the Boyer Moore table will be recalculated, but the 
* iterator's position is unchanged.
* @param strsrch search iterator data struct
* @param pattern string
* @param patternlength pattern length, -1 for null-terminated string
* @param status for errors if it occurs. If text is NULL, or textlength is 0 
*               then an U_ILLEGAL_ARGUMENT_ERROR is returned with no change
*               done to strsrch.
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_setPattern(      UStringSearch *strsrch, 
                                         const UChar         *pattern,
                                               int32_t        patternlength,
                                               UErrorCode    *status);

/**
* Gets the search pattern
* @param strsrch search iterator data struct
* @param length return length of the pattern, -1 indicates that the pattern 
*               is null-terminated
* @return pattern string
* @stable ICU 2.4
*/
U_STABLE const UChar * U_EXPORT2 usearch_getPattern(
                                               const UStringSearch *strsrch, 
                                                     int32_t       *length);

/* methods ------------------------------------------------------------- */

/**
* 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>usearch_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 strsrch search iterator data struct
* @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 #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_first(UStringSearch *strsrch, 
 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>usearch_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>
* 
* Search positions that may render incorrect results are highlighted in the
* header comments. If position is less than or greater than the text range 
* for searching, an U_INDEX_OUTOFBOUNDS_ERROR will be returned
* @param strsrch search iterator data struct
* @param position to start the search at
* @param status for errors if it occurs
* @return The character index of the first match following <tt>pos</tt>,
* or <tt>USEARCH_DONE</tt> if there are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_following(UStringSearch *strsrch, 
 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>usearch_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 strsrch search iterator data struct
* @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 #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_last(UStringSearch *strsrch, 
 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>usearch_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>
* 
* Search positions that may render incorrect results are highlighted in the
* header comments. If position is less than or greater than the text range 
* for searching, an U_INDEX_OUTOFBOUNDS_ERROR will be returned.
* 
* 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 strsrch search iterator data struct
* @param position index position the search is to begin at
* @param status for errors if it occurs
* @return The character index of the first match preceding <tt>pos</tt>,
* or <tt>USEARCH_DONE</tt> if there are no matches.
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_preceding(UStringSearch *strsrch, 
 int32_t position, 
 UErrorCode *status);
 
/**
* Returns the index of the next point at which the string text matches the
* search pattern, starting from the current position.
* The iterator is adjusted so that its current 
* index (as returned by <tt>usearch_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 strsrch search iterator data struct
* @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 #usearch_first
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_next(UStringSearch *strsrch, 
 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>usearch_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 strsrch search iterator data struct
* @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 #usearch_last
* @see #usearch_getOffset
* @see #USEARCH_DONE
* @stable ICU 2.4
*/
U_STABLE int32_t U_EXPORT2 usearch_previous(UStringSearch *strsrch, 
 UErrorCode *status);
 
/** 
* Reset 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.
* @param strsrch search iterator data struct
* @see #usearch_first
* @stable ICU 2.4
*/
U_STABLE void U_EXPORT2 usearch_reset(UStringSearch *strsrch);

#ifndef U_HIDE_INTERNAL_API
/**
  *  Simple forward search for the pattern, starting at a specified index,
  *     and using a default set search options.
  *
  *  This is an experimental function, and is not an official part of the
  *      ICU API.
  *
  *  The collator options, such as UCOL_STRENGTH and UCOL_NORMALIZTION, are honored.
  *
  *  The UStringSearch options USEARCH_CANONICAL_MATCH, USEARCH_OVERLAP and
  *  any Break Iterator are ignored.
  *
  *  Matches obey the following constraints:
  *
  *      Characters at the start or end positions of a match that are ignorable
  *      for collation are not included as part of the match, unless they
  *      are part of a combining sequence, as described below.
  *
  *      A match will not include a partial combining sequence.  Combining
  *      character sequences  are considered to be  inseparable units,
  *      and either match the pattern completely, or are considered to not match
  *      at all.  Thus, for example, an A followed a combining accent mark will 
  *      not be found when searching for a plain (unaccented) A.   (unless
  *      the collation strength has been set to ignore all accents).
  *
  *      When beginning a search, the initial starting position, startIdx,
  *      is assumed to be an acceptable match boundary with respect to
  *      combining characters.  A combining sequence that spans across the
  *      starting point will not suppress a match beginning at startIdx.
  *
  *      Characters that expand to multiple collation elements
  *      (German sharp-S becoming 'ss', or the composed forms of accented
  *      characters, for example) also must match completely.
  *      Searching for a single 's' in a string containing only a sharp-s will 
  *      find no match.
  *
  *
  *  @param strsrch    the UStringSearch struct, which references both
  *                    the text to be searched  and the pattern being sought.
  *  @param startIdx   The index into the text to begin the search.
  *  @param matchStart An out parameter, the starting index of the matched text.
  *                    This parameter may be NULL.
  *                    A value of -1 will be returned if no match was found.
  *  @param matchLimit Out parameter, the index of the first position following the matched text.
  *                    The matchLimit will be at a suitable position for beginning a subsequent search
  *                    in the input text.
  *                    This parameter may be NULL.
  *                    A value of -1 will be returned if no match was found.
  *          
  *  @param status     Report any errors.  Note that no match found is not an error.
  *  @return           TRUE if a match was found, FALSE otherwise.
  *
  *  @internal
  */
U_INTERNAL UBool U_EXPORT2 usearch_search(UStringSearch *strsrch,
                                          int32_t        startIdx,
                                          int32_t        *matchStart,
                                          int32_t        *matchLimit,
                                          UErrorCode     *status);

/**
  *  Simple backwards search for the pattern, starting at a specified index,
  *     and using using a default set search options.
  *
  *  This is an experimental function, and is not an official part of the
  *      ICU API.
  *
  *  The collator options, such as UCOL_STRENGTH and UCOL_NORMALIZTION, are honored.
  *
  *  The UStringSearch options USEARCH_CANONICAL_MATCH, USEARCH_OVERLAP and
  *  any Break Iterator are ignored.
  *
  *  Matches obey the following constraints:
  *
  *      Characters at the start or end positions of a match that are ignorable
  *      for collation are not included as part of the match, unless they
  *      are part of a combining sequence, as described below.
  *
  *      A match will not include a partial combining sequence.  Combining
  *      character sequences  are considered to be  inseparable units,
  *      and either match the pattern completely, or are considered to not match
  *      at all.  Thus, for example, an A followed a combining accent mark will 
  *      not be found when searching for a plain (unaccented) A.   (unless
  *      the collation strength has been set to ignore all accents).
  *
  *      When beginning a search, the initial starting position, startIdx,
  *      is assumed to be an acceptable match boundary with respect to
  *      combining characters.  A combining sequence that spans across the
  *      starting point will not suppress a match beginning at startIdx.
  *
  *      Characters that expand to multiple collation elements
  *      (German sharp-S becoming 'ss', or the composed forms of accented
  *      characters, for example) also must match completely.
  *      Searching for a single 's' in a string containing only a sharp-s will 
  *      find no match.
  *
  *
  *  @param strsrch    the UStringSearch struct, which references both
  *                    the text to be searched  and the pattern being sought.
  *  @param startIdx   The index into the text to begin the search.
  *  @param matchStart An out parameter, the starting index of the matched text.
  *                    This parameter may be NULL.
  *                    A value of -1 will be returned if no match was found.
  *  @param matchLimit Out parameter, the index of the first position following the matched text.
  *                    The matchLimit will be at a suitable position for beginning a subsequent search
  *                    in the input text.
  *                    This parameter may be NULL.
  *                    A value of -1 will be returned if no match was found.
  *          
  *  @param status     Report any errors.  Note that no match found is not an error.
  *  @return           TRUE if a match was found, FALSE otherwise.
  *
  *  @internal
  */
U_INTERNAL UBool U_EXPORT2 usearch_searchBackwards(UStringSearch *strsrch,
                                                   int32_t        startIdx,
                                                   int32_t        *matchStart,
                                                   int32_t        *matchLimit,
                                                   UErrorCode     *status);
#endif  /* U_HIDE_INTERNAL_API */

#endif /* #if !UCONFIG_NO_COLLATION  && !UCONFIG_NO_BREAK_ITERATION */

#endif

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