DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (31ec81b5d7bb)

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/*
**********************************************************************
*   Copyright (C) 2001-2011 IBM and others. All rights reserved.
**********************************************************************
*   Date        Name        Description
*  07/02/2001   synwee      Creation.
**********************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION

#include "unicode/usearch.h"
#include "unicode/ustring.h"
#include "unicode/uchar.h"
#include "unicode/utf16.h"
#include "normalizer2impl.h"
#include "ucol_imp.h"
#include "usrchimp.h"
#include "cmemory.h"
#include "ucln_in.h"
#include "uassert.h"
#include "ustr_imp.h"

U_NAMESPACE_USE

// don't use Boyer-Moore
// (and if we decide to turn this on again there are several new TODOs that will need to be addressed)
#define BOYER_MOORE 0

#define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))

// internal definition ---------------------------------------------------

#define LAST_BYTE_MASK_          0xFF
#define SECOND_LAST_BYTE_SHIFT_  8
#define SUPPLEMENTARY_MIN_VALUE_ 0x10000

static const Normalizer2Impl *g_nfcImpl = NULL;

// internal methods -------------------------------------------------

/**
* Fast collation element iterator setOffset.
* This function does not check for bounds.
* @param coleiter collation element iterator
* @param offset to set
*/
static
inline void setColEIterOffset(UCollationElements *elems,
                      int32_t             offset)
{
    collIterate *ci = &(elems->iteratordata_);
    ci->pos         = ci->string + offset;
    ci->CEpos       = ci->toReturn = ci->extendCEs ? ci->extendCEs : ci->CEs;
    if (ci->flags & UCOL_ITER_INNORMBUF) {
        ci->flags = ci->origFlags;
    }
    ci->fcdPosition = NULL;

    ci->offsetReturn = NULL;
    ci->offsetStore  = ci->offsetBuffer;
    ci->offsetRepeatCount = ci->offsetRepeatValue = 0;
}

/**
* Getting the mask for collation strength
* @param strength collation strength
* @return collation element mask
*/
static
inline uint32_t getMask(UCollationStrength strength)
{
    switch (strength)
    {
    case UCOL_PRIMARY:
        return UCOL_PRIMARYORDERMASK;
    case UCOL_SECONDARY:
        return UCOL_SECONDARYORDERMASK | UCOL_PRIMARYORDERMASK;
    default:
        return UCOL_TERTIARYORDERMASK | UCOL_SECONDARYORDERMASK |
               UCOL_PRIMARYORDERMASK;
    }
}

/**
* This is to squeeze the 21bit ces into a 256 table
* @param ce collation element
* @return collapsed version of the collation element
*/
static
inline int hash(uint32_t ce)
{
    // the old value UCOL_PRIMARYORDER(ce) % MAX_TABLE_SIZE_ does not work
    // well with the new collation where most of the latin 1 characters
    // are of the value xx000xxx. their hashes will most of the time be 0
    // to be discussed on the hash algo.
    return UCOL_PRIMARYORDER(ce) % MAX_TABLE_SIZE_;
}

U_CDECL_BEGIN
static UBool U_CALLCONV
usearch_cleanup(void) {
    g_nfcImpl = NULL;
    return TRUE;
}
U_CDECL_END

/**
* Initializing the fcd tables.
* Internal method, status assumed to be a success.
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
*/
static
inline void initializeFCD(UErrorCode *status)
{
    if (g_nfcImpl == NULL) {
        g_nfcImpl = Normalizer2Factory::getNFCImpl(*status);
        ucln_i18n_registerCleanup(UCLN_I18N_USEARCH, usearch_cleanup);
    }
}

/**
* Gets the fcd value for a character at the argument index.
* This method takes into accounts of the supplementary characters.
* @param str UTF16 string where character for fcd retrieval resides
* @param offset position of the character whose fcd is to be retrieved, to be
*               overwritten with the next character position, taking
*               surrogate characters into consideration.
* @param strlength length of the argument string
* @return fcd value
*/
static
uint16_t getFCD(const UChar   *str, int32_t *offset,
                             int32_t  strlength)
{
    const UChar *temp = str + *offset;
    uint16_t    result = g_nfcImpl->nextFCD16(temp, str + strlength);
    *offset = (int32_t)(temp - str);
    return result;
}

/**
* Getting the modified collation elements taking into account the collation
* attributes
* @param strsrch string search data
* @param sourcece
* @return the modified collation element
*/
static
inline int32_t getCE(const UStringSearch *strsrch, uint32_t sourcece)
{
    // note for tertiary we can't use the collator->tertiaryMask, that
    // is a preprocessed mask that takes into account case options. since
    // we are only concerned with exact matches, we don't need that.
    sourcece &= strsrch->ceMask;

    if (strsrch->toShift) {
        // alternate handling here, since only the 16 most significant digits
        // is only used, we can safely do a compare without masking
        // if the ce is a variable, we mask and get only the primary values
        // no shifting to quartenary is required since all primary values
        // less than variabletop will need to be masked off anyway.
        if (strsrch->variableTop > sourcece) {
            if (strsrch->strength >= UCOL_QUATERNARY) {
                sourcece &= UCOL_PRIMARYORDERMASK;
            }
            else {
                sourcece = UCOL_IGNORABLE;
            }
        }
    } else if (strsrch->strength >= UCOL_QUATERNARY && sourcece == UCOL_IGNORABLE) {
        sourcece = 0xFFFF;
    }

    return sourcece;
}

/**
* Allocate a memory and returns NULL if it failed.
* Internal method, status assumed to be a success.
* @param size to allocate
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return newly allocated array, NULL otherwise
*/
static
inline void * allocateMemory(uint32_t size, UErrorCode *status)
{
    uint32_t *result = (uint32_t *)uprv_malloc(size);
    if (result == NULL) {
        *status = U_MEMORY_ALLOCATION_ERROR;
    }
    return result;
}

/**
* Adds a uint32_t value to a destination array.
* Creates a new array if we run out of space. The caller will have to
* manually deallocate the newly allocated array.
* Internal method, status assumed to be success, caller has to check status
* before calling this method. destination not to be NULL and has at least
* size destinationlength.
* @param destination target array
* @param offset destination offset to add value
* @param destinationlength target array size, return value for the new size
* @param value to be added
* @param increments incremental size expected
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return new destination array, destination if there was no new allocation
*/
static
inline int32_t * addTouint32_tArray(int32_t    *destination,
                                    uint32_t    offset,
                                    uint32_t   *destinationlength,
                                    uint32_t    value,
                                    uint32_t    increments,
                                    UErrorCode *status)
{
    uint32_t newlength = *destinationlength;
    if (offset + 1 == newlength) {
        newlength += increments;
        int32_t *temp = (int32_t *)allocateMemory(
                                         sizeof(int32_t) * newlength, status);
        if (U_FAILURE(*status)) {
            return NULL;
        }
        uprv_memcpy(temp, destination, sizeof(int32_t) * offset);
        *destinationlength = newlength;
        destination        = temp;
    }
    destination[offset] = value;
    return destination;
}

/**
* Adds a uint64_t value to a destination array.
* Creates a new array if we run out of space. The caller will have to
* manually deallocate the newly allocated array.
* Internal method, status assumed to be success, caller has to check status
* before calling this method. destination not to be NULL and has at least
* size destinationlength.
* @param destination target array
* @param offset destination offset to add value
* @param destinationlength target array size, return value for the new size
* @param value to be added
* @param increments incremental size expected
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return new destination array, destination if there was no new allocation
*/
static
inline int64_t * addTouint64_tArray(int64_t    *destination,
                                    uint32_t    offset,
                                    uint32_t   *destinationlength,
                                    uint64_t    value,
                                    uint32_t    increments,
                                    UErrorCode *status)
{
    uint32_t newlength = *destinationlength;
    if (offset + 1 == newlength) {
        newlength += increments;
        int64_t *temp = (int64_t *)allocateMemory(
                                         sizeof(int64_t) * newlength, status);

        if (U_FAILURE(*status)) {
            return NULL;
        }

        uprv_memcpy(temp, destination, sizeof(int64_t) * offset);
        *destinationlength = newlength;
        destination        = temp;
    }

    destination[offset] = value;

    return destination;
}

/**
* Initializing the ce table for a pattern.
* Stores non-ignorable collation keys.
* Table size will be estimated by the size of the pattern text. Table
* expansion will be perform as we go along. Adding 1 to ensure that the table
* size definitely increases.
* Internal method, status assumed to be a success.
* @param strsrch string search data
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return total number of expansions
*/
static
inline uint16_t initializePatternCETable(UStringSearch *strsrch,
                                         UErrorCode    *status)
{
    UPattern *pattern            = &(strsrch->pattern);
    uint32_t  cetablesize        = INITIAL_ARRAY_SIZE_;
    int32_t  *cetable            = pattern->CEBuffer;
    uint32_t  patternlength      = pattern->textLength;
    UCollationElements *coleiter = strsrch->utilIter;

    if (coleiter == NULL) {
        coleiter = ucol_openElements(strsrch->collator, pattern->text,
                                     patternlength, status);
        // status will be checked in ucol_next(..) later and if it is an
        // error UCOL_NULLORDER the result of ucol_next(..) and 0 will be
        // returned.
        strsrch->utilIter = coleiter;
    }
    else {
        uprv_init_collIterate(strsrch->collator, pattern->text,
                         pattern->textLength,
                         &coleiter->iteratordata_,
                         status);
    }
    if(U_FAILURE(*status)) {
        return 0;
    }

    if (pattern->CE != cetable && pattern->CE) {
        uprv_free(pattern->CE);
    }

    uint16_t  offset      = 0;
    uint16_t  result      = 0;
    int32_t   ce;

    while ((ce = ucol_next(coleiter, status)) != UCOL_NULLORDER &&
           U_SUCCESS(*status)) {
        uint32_t newce = getCE(strsrch, ce);
        if (newce) {
            int32_t *temp = addTouint32_tArray(cetable, offset, &cetablesize,
                                  newce,
                                  patternlength - ucol_getOffset(coleiter) + 1,
                                  status);
            if (U_FAILURE(*status)) {
                return 0;
            }
            offset ++;
            if (cetable != temp && cetable != pattern->CEBuffer) {
                uprv_free(cetable);
            }
            cetable = temp;
        }
        result += (uint16_t)(ucol_getMaxExpansion(coleiter, ce) - 1);
    }

    cetable[offset]   = 0;
    pattern->CE       = cetable;
    pattern->CELength = offset;

    return result;
}

/**
* Initializing the pce table for a pattern.
* Stores non-ignorable collation keys.
* Table size will be estimated by the size of the pattern text. Table
* expansion will be perform as we go along. Adding 1 to ensure that the table
* size definitely increases.
* Internal method, status assumed to be a success.
* @param strsrch string search data
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return total number of expansions
*/
static
inline uint16_t initializePatternPCETable(UStringSearch *strsrch,
                                          UErrorCode    *status)
{
    UPattern *pattern            = &(strsrch->pattern);
    uint32_t  pcetablesize       = INITIAL_ARRAY_SIZE_;
    int64_t  *pcetable           = pattern->PCEBuffer;
    uint32_t  patternlength      = pattern->textLength;
    UCollationElements *coleiter = strsrch->utilIter;

    if (coleiter == NULL) {
        coleiter = ucol_openElements(strsrch->collator, pattern->text,
                                     patternlength, status);
        // status will be checked in ucol_next(..) later and if it is an
        // error UCOL_NULLORDER the result of ucol_next(..) and 0 will be
        // returned.
        strsrch->utilIter = coleiter;
    } else {
        uprv_init_collIterate(strsrch->collator, pattern->text,
                              pattern->textLength,
                              &coleiter->iteratordata_,
                              status);
    }
    if(U_FAILURE(*status)) {
        return 0;
    }

    if (pattern->PCE != pcetable && pattern->PCE != NULL) {
        uprv_free(pattern->PCE);
    }

    uint16_t  offset = 0;
    uint16_t  result = 0;
    int64_t   pce;

    uprv_init_pce(coleiter);

    // ** Should processed CEs be signed or unsigned?
    // ** (the rest of the code in this file seems to play fast-and-loose with
    // **  whether a CE is signed or unsigned. For example, look at routine above this one.)
    while ((pce = ucol_nextProcessed(coleiter, NULL, NULL, status)) != UCOL_PROCESSED_NULLORDER &&
           U_SUCCESS(*status)) {
        int64_t *temp = addTouint64_tArray(pcetable, offset, &pcetablesize,
                              pce,
                              patternlength - ucol_getOffset(coleiter) + 1,
                              status);

        if (U_FAILURE(*status)) {
            return 0;
        }

        offset += 1;

        if (pcetable != temp && pcetable != pattern->PCEBuffer) {
            uprv_free(pcetable);
        }

        pcetable = temp;
        //result += (uint16_t)(ucol_getMaxExpansion(coleiter, ce) - 1);
    }

    pcetable[offset]   = 0;
    pattern->PCE       = pcetable;
    pattern->PCELength = offset;

    return result;
}

/**
* Initializes the pattern struct.
* Internal method, status assumed to be success.
* @param strsrch UStringSearch data storage
* @param status output error if any, caller to check status before calling
*               method, status assumed to be success when passed in.
* @return expansionsize the total expansion size of the pattern
*/
static
inline int16_t initializePattern(UStringSearch *strsrch, UErrorCode *status)
{
          UPattern   *pattern     = &(strsrch->pattern);
    const UChar      *patterntext = pattern->text;
          int32_t     length      = pattern->textLength;
          int32_t index       = 0;

    // Since the strength is primary, accents are ignored in the pattern.
    if (strsrch->strength == UCOL_PRIMARY) {
        pattern->hasPrefixAccents = 0;
        pattern->hasSuffixAccents = 0;
    } else {
        pattern->hasPrefixAccents = getFCD(patterntext, &index, length) >>
                                                         SECOND_LAST_BYTE_SHIFT_;
        index = length;
        U16_BACK_1(patterntext, 0, index);
        pattern->hasSuffixAccents = getFCD(patterntext, &index, length) &
                                                                 LAST_BYTE_MASK_;
    }

    // ** HACK **
    if (strsrch->pattern.PCE != NULL) {
        if (strsrch->pattern.PCE != strsrch->pattern.PCEBuffer) {
            uprv_free(strsrch->pattern.PCE);
        }

        strsrch->pattern.PCE = NULL;
    }

    // since intializePattern is an internal method status is a success.
    return initializePatternCETable(strsrch, status);
}

/**
* Initializing shift tables, with the default values.
* If a corresponding default value is 0, the shift table is not set.
* @param shift table for forwards shift
* @param backshift table for backwards shift
* @param cetable table containing pattern ce
* @param cesize size of the pattern ces
* @param expansionsize total size of the expansions
* @param defaultforward the default forward value
* @param defaultbackward the default backward value
*/
static
inline void setShiftTable(int16_t   shift[], int16_t backshift[],
                          int32_t  *cetable, int32_t cesize,
                          int16_t   expansionsize,
                          int16_t   defaultforward,
                          int16_t   defaultbackward)
{
    // estimate the value to shift. to do that we estimate the smallest
    // number of characters to give the relevant ces, ie approximately
    // the number of ces minus their expansion, since expansions can come
    // from a character.
    int32_t count;
    for (count = 0; count < MAX_TABLE_SIZE_; count ++) {
        shift[count] = defaultforward;
    }
    cesize --; // down to the last index
    for (count = 0; count < cesize; count ++) {
        // number of ces from right of array to the count
        int temp = defaultforward - count - 1;
        shift[hash(cetable[count])] = temp > 1 ? temp : 1;
    }
    shift[hash(cetable[cesize])] = 1;
    // for ignorables we just shift by one. see test examples.
    shift[hash(0)] = 1;

    for (count = 0; count < MAX_TABLE_SIZE_; count ++) {
        backshift[count] = defaultbackward;
    }
    for (count = cesize; count > 0; count --) {
        // the original value count does not seem to work
        backshift[hash(cetable[count])] = count > expansionsize ?
                                          (int16_t)(count - expansionsize) : 1;
    }
    backshift[hash(cetable[0])] = 1;
    backshift[hash(0)] = 1;
}

/**
* Building of the pattern collation element list and the boyer moore strsrch
* table.
* The canonical match will only be performed after the default match fails.
* For both cases we need to remember the size of the composed and decomposed
* versions of the string. Since the Boyer-Moore shift calculations shifts by
* a number of characters in the text and tries to match the pattern from that
* offset, the shift value can not be too large in case we miss some
* characters. To choose a right shift size, we estimate the NFC form of the
* and use its size as a shift guide. The NFC form should be the small
* possible representation of the pattern. Anyways, we'll err on the smaller
* shift size. Hence the calculation for minlength.
* Canonical match will be performed slightly differently. We'll split the
* pattern into 3 parts, the prefix accents (PA), the middle string bounded by
* the first and last base character (MS), the ending accents (EA). Matches
* will be done on MS first, and only when we match MS then some processing
* will be required for the prefix and end accents in order to determine if
* they match PA and EA. Hence the default shift values
* for the canonical match will take the size of either end's accent into
* consideration. Forwards search will take the end accents into consideration
* for the default shift values and the backwards search will take the prefix
* accents into consideration.
* If pattern has no non-ignorable ce, we return a illegal argument error.
* Internal method, status assumed to be success.
* @param strsrch UStringSearch data storage
* @param status  for output errors if it occurs, status is assumed to be a
*                success when it is passed in.
*/
static
inline void initialize(UStringSearch *strsrch, UErrorCode *status)
{
    int16_t expandlength  = initializePattern(strsrch, status);
    if (U_SUCCESS(*status) && strsrch->pattern.CELength > 0) {
        UPattern *pattern = &strsrch->pattern;
        int32_t   cesize  = pattern->CELength;

        int16_t minlength = cesize > expandlength
                            ? (int16_t)cesize - expandlength : 1;
        pattern->defaultShiftSize    = minlength;
        setShiftTable(pattern->shift, pattern->backShift, pattern->CE,
                      cesize, expandlength, minlength, minlength);
        return;
    }
    strsrch->pattern.defaultShiftSize = 0;
}

#if BOYER_MOORE
/**
* Check to make sure that the match length is at the end of the character by
* using the breakiterator.
* @param strsrch string search data
* @param start target text start offset
* @param end target text end offset
*/
static
void checkBreakBoundary(const UStringSearch *strsrch, int32_t * /*start*/,
                               int32_t *end)
{
#if !UCONFIG_NO_BREAK_ITERATION
    UBreakIterator *breakiterator = strsrch->search->internalBreakIter;
    if (breakiterator) {
        int32_t matchend = *end;
        //int32_t matchstart = *start;

        if (!ubrk_isBoundary(breakiterator, matchend)) {
            *end = ubrk_following(breakiterator, matchend);
        }

        /* Check the start of the matched text to make sure it doesn't have any accents
         * before it.  This code may not be necessary and so it is commented out */
        /*if (!ubrk_isBoundary(breakiterator, matchstart) && !ubrk_isBoundary(breakiterator, matchstart-1)) {
            *start = ubrk_preceding(breakiterator, matchstart);
        }*/
    }
#endif
}

/**
* Determine whether the target text in UStringSearch bounded by the offset
* start and end is one or more whole units of text as
* determined by the breakiterator in UStringSearch.
* @param strsrch string search data
* @param start target text start offset
* @param end target text end offset
*/
static
UBool isBreakUnit(const UStringSearch *strsrch, int32_t start,
                               int32_t    end)
{
#if !UCONFIG_NO_BREAK_ITERATION
    UBreakIterator *breakiterator = strsrch->search->breakIter;
    //TODO: Add here.
    if (breakiterator) {
        int32_t startindex = ubrk_first(breakiterator);
        int32_t endindex   = ubrk_last(breakiterator);

        // out-of-range indexes are never boundary positions
        if (start < startindex || start > endindex ||
            end < startindex || end > endindex) {
            return FALSE;
        }
        // otherwise, we can use following() on the position before the
        // specified one and return true of the position we get back is the
        // one the user specified
        UBool result = (start == startindex ||
                ubrk_following(breakiterator, start - 1) == start) &&
               (end == endindex ||
                ubrk_following(breakiterator, end - 1) == end);
        if (result) {
            // iterates the individual ces
                  UCollationElements *coleiter  = strsrch->utilIter;
            const UChar              *text      = strsrch->search->text +
                                                                      start;
                  UErrorCode          status    = U_ZERO_ERROR;
            ucol_setText(coleiter, text, end - start, &status);
            for (int32_t count = 0; count < strsrch->pattern.CELength;
                 count ++) {
                int32_t ce = getCE(strsrch, ucol_next(coleiter, &status));
                if (ce == UCOL_IGNORABLE) {
                    count --;
                    continue;
                }
                if (U_FAILURE(status) || ce != strsrch->pattern.CE[count]) {
                    return FALSE;
                }
            }
            int32_t nextce = ucol_next(coleiter, &status);
            while (ucol_getOffset(coleiter) == (end - start)
                   && getCE(strsrch, nextce) == UCOL_IGNORABLE) {
                nextce = ucol_next(coleiter, &status);
            }
            if (ucol_getOffset(coleiter) == (end - start)
                && nextce != UCOL_NULLORDER) {
                // extra collation elements at the end of the match
                return FALSE;
            }
        }
        return result;
    }
#endif
    return TRUE;
}

/**
* Getting the next base character offset if current offset is an accent,
* or the current offset if the current character contains a base character.
* accents the following base character will be returned
* @param text string
* @param textoffset current offset
* @param textlength length of text string
* @return the next base character or the current offset
*         if the current character is contains a base character.
*/
static
inline int32_t getNextBaseOffset(const UChar       *text,
                                           int32_t  textoffset,
                                           int32_t      textlength)
{
    if (textoffset < textlength) {
        int32_t temp = textoffset;
        if (getFCD(text, &temp, textlength) >> SECOND_LAST_BYTE_SHIFT_) {
            while (temp < textlength) {
                int32_t result = temp;
                if ((getFCD(text, &temp, textlength) >>
                     SECOND_LAST_BYTE_SHIFT_) == 0) {
                    return result;
                }
            }
            return textlength;
        }
    }
    return textoffset;
}

/**
* Gets the next base character offset depending on the string search pattern
* data
* @param strsrch string search data
* @param textoffset current offset, one offset away from the last character
*                   to search for.
* @return start index of the next base character or the current offset
*         if the current character is contains a base character.
*/
static
inline int32_t getNextUStringSearchBaseOffset(UStringSearch *strsrch,
                                                  int32_t    textoffset)
{
    int32_t textlength = strsrch->search->textLength;
    if (strsrch->pattern.hasSuffixAccents &&
        textoffset < textlength) {
              int32_t  temp       = textoffset;
        const UChar       *text       = strsrch->search->text;
        U16_BACK_1(text, 0, temp);
        if (getFCD(text, &temp, textlength) & LAST_BYTE_MASK_) {
            return getNextBaseOffset(text, textoffset, textlength);
        }
    }
    return textoffset;
}

/**
* Shifting the collation element iterator position forward to prepare for
* a following match. If the last character is a unsafe character, we'll only
* shift by 1 to capture contractions, normalization etc.
* Internal method, status assumed to be success.
* @param text strsrch string search data
* @param textoffset start text position to do search
* @param ce the text ce which failed the match.
* @param patternceindex index of the ce within the pattern ce buffer which
*        failed the match
* @return final offset
*/
static
inline int32_t shiftForward(UStringSearch *strsrch,
                                int32_t    textoffset,
                                int32_t       ce,
                                int32_t        patternceindex)
{
    UPattern *pattern = &(strsrch->pattern);
    if (ce != UCOL_NULLORDER) {
        int32_t shift = pattern->shift[hash(ce)];
        // this is to adjust for characters in the middle of the
        // substring for matching that failed.
        int32_t adjust = pattern->CELength - patternceindex;
        if (adjust > 1 && shift >= adjust) {
            shift -= adjust - 1;
        }
        textoffset += shift;
    }
    else {
        textoffset += pattern->defaultShiftSize;
    }

    textoffset = getNextUStringSearchBaseOffset(strsrch, textoffset);
    // check for unsafe characters
    // * if it is the start or middle of a contraction: to be done after
    //   a initial match is found
    // * thai or lao base consonant character: similar to contraction
    // * high surrogate character: similar to contraction
    // * next character is a accent: shift to the next base character
    return textoffset;
}
#endif // #if BOYER_MOORE

/**
* sets match not found
* @param strsrch string search data
*/
static
inline void setMatchNotFound(UStringSearch *strsrch)
{
    // this method resets the match result regardless of the error status.
    strsrch->search->matchedIndex = USEARCH_DONE;
    strsrch->search->matchedLength = 0;
    if (strsrch->search->isForwardSearching) {
        setColEIterOffset(strsrch->textIter, strsrch->search->textLength);
    }
    else {
        setColEIterOffset(strsrch->textIter, 0);
    }
}

#if BOYER_MOORE
/**
* Gets the offset to the next safe point in text.
* ie. not the middle of a contraction, swappable characters or supplementary
* characters.
* @param collator collation sata
* @param text string to work with
* @param textoffset offset in string
* @param textlength length of text string
* @return offset to the next safe character
*/
static
inline int32_t getNextSafeOffset(const UCollator   *collator,
                                     const UChar       *text,
                                           int32_t  textoffset,
                                           int32_t      textlength)
{
    int32_t result = textoffset; // first contraction character
    while (result != textlength && ucol_unsafeCP(text[result], collator)) {
        result ++;
    }
    return result;
}

/**
* This checks for accents in the potential match started with a .
* composite character.
* This is really painful... we have to check that composite character do not
* have any extra accents. We have to normalize the potential match and find
* the immediate decomposed character before the match.
* The first composite character would have been taken care of by the fcd
* checks in checkForwardExactMatch.
* This is the slow path after the fcd of the first character and
* the last character has been checked by checkForwardExactMatch and we
* determine that the potential match has extra non-ignorable preceding
* ces.
* E.g. looking for \u0301 acute in \u01FA A ring above and acute,
* checkExtraMatchAccent should fail since there is a middle ring in \u01FA
* Note here that accents checking are slow and cautioned in the API docs.
* Internal method, status assumed to be a success, caller should check status
* before calling this method
* @param strsrch string search data
* @param start index of the potential unfriendly composite character
* @param end index of the potential unfriendly composite character
* @param status output error status if any.
* @return TRUE if there is non-ignorable accents before at the beginning
*              of the match, FALSE otherwise.
*/

static
UBool checkExtraMatchAccents(const UStringSearch *strsrch, int32_t start,
                                   int32_t    end,
                                   UErrorCode    *status)
{
    UBool result = FALSE;
    if (strsrch->pattern.hasPrefixAccents) {
              int32_t  length = end - start;
              int32_t  offset = 0;
        const UChar       *text   = strsrch->search->text + start;

        U16_FWD_1(text, offset, length);
        // we are only concerned with the first composite character
        if (unorm_quickCheck(text, offset, UNORM_NFD, status) == UNORM_NO) {
            int32_t safeoffset = getNextSafeOffset(strsrch->collator,
                                                       text, 0, length);
            if (safeoffset != length) {
                safeoffset ++;
            }
            UChar   *norm = NULL;
            UChar    buffer[INITIAL_ARRAY_SIZE_];
            int32_t  size = unorm_normalize(text, safeoffset, UNORM_NFD, 0,
                                            buffer, INITIAL_ARRAY_SIZE_,
                                            status);
            if (U_FAILURE(*status)) {
                return FALSE;
            }
            if (size >= INITIAL_ARRAY_SIZE_) {
                norm = (UChar *)allocateMemory((size + 1) * sizeof(UChar),
                                               status);
                // if allocation failed, status will be set to
                // U_MEMORY_ALLOCATION_ERROR and unorm_normalize internally
                // checks for it.
                size = unorm_normalize(text, safeoffset, UNORM_NFD, 0, norm,
                                       size, status);
                if (U_FAILURE(*status) && norm != NULL) {
                    uprv_free(norm);
                    return FALSE;
                }
            }
            else {
                norm = buffer;
            }

            UCollationElements *coleiter  = strsrch->utilIter;
            ucol_setText(coleiter, norm, size, status);
            uint32_t            firstce   = strsrch->pattern.CE[0];
            UBool               ignorable = TRUE;
            uint32_t            ce        = UCOL_IGNORABLE;
            while (U_SUCCESS(*status) && ce != firstce && ce != (uint32_t)UCOL_NULLORDER) {
                offset = ucol_getOffset(coleiter);
                if (ce != firstce && ce != UCOL_IGNORABLE) {
                    ignorable = FALSE;
                }
                ce = ucol_next(coleiter, status);
            }
            UChar32 codepoint;
            U16_PREV(norm, 0, offset, codepoint);
            result = !ignorable && (u_getCombiningClass(codepoint) != 0);

            if (norm != buffer) {
                uprv_free(norm);
            }
        }
    }

    return result;
}

/**
* Used by exact matches, checks if there are accents before the match.
* This is really painful... we have to check that composite characters at
* the start of the matches have to not have any extra accents.
* We check the FCD of the character first, if it starts with an accent and
* the first pattern ce does not match the first ce of the character, we bail.
* Otherwise we try normalizing the first composite
* character and find the immediate decomposed character before the match to
* see if it is an non-ignorable accent.
* Now normalizing the first composite character is enough because we ensure
* that when the match is passed in here with extra beginning ces, the
* first or last ce that match has to occur within the first character.
* E.g. looking for \u0301 acute in \u01FA A ring above and acute,
* checkExtraMatchAccent should fail since there is a middle ring in \u01FA
* Note here that accents checking are slow and cautioned in the API docs.
* @param strsrch string search data
* @param start offset
* @param end offset
* @return TRUE if there are accents on either side of the match,
*         FALSE otherwise
*/
static
UBool hasAccentsBeforeMatch(const UStringSearch *strsrch, int32_t start,
                                  int32_t    end)
{
    if (strsrch->pattern.hasPrefixAccents) {
        UCollationElements *coleiter  = strsrch->textIter;
        UErrorCode          status    = U_ZERO_ERROR;
        // we have been iterating forwards previously
        uint32_t            ignorable = TRUE;
        int32_t             firstce   = strsrch->pattern.CE[0];

        setColEIterOffset(coleiter, start);
        int32_t ce  = getCE(strsrch, ucol_next(coleiter, &status));
        if (U_FAILURE(status)) {
            return TRUE;
        }
        while (ce != firstce) {
            if (ce != UCOL_IGNORABLE) {
                ignorable = FALSE;
            }
            ce = getCE(strsrch, ucol_next(coleiter, &status));
            if (U_FAILURE(status) || ce == UCOL_NULLORDER) {
                return TRUE;
            }
        }
        if (!ignorable && inNormBuf(coleiter)) {
            // within normalization buffer, discontiguous handled here
            return TRUE;
        }

        // within text
        int32_t temp = start;
        // original code
        // accent = (getFCD(strsrch->search->text, &temp,
        //                  strsrch->search->textLength)
        //            >> SECOND_LAST_BYTE_SHIFT_);
        // however this code does not work well with VC7 .net in release mode.
        // maybe the inlines for getFCD combined with shifting has bugs in
        // VC7. anyways this is a work around.
        UBool accent = getFCD(strsrch->search->text, &temp,
                              strsrch->search->textLength) > 0xFF;
        if (!accent) {
            return checkExtraMatchAccents(strsrch, start, end, &status);
        }
        if (!ignorable) {
            return TRUE;
        }
        if (start > 0) {
            temp = start;
            U16_BACK_1(strsrch->search->text, 0, temp);
            if (getFCD(strsrch->search->text, &temp,
                       strsrch->search->textLength) & LAST_BYTE_MASK_) {
                setColEIterOffset(coleiter, start);
                ce = ucol_previous(coleiter, &status);
                if (U_FAILURE(status) ||
                    (ce != UCOL_NULLORDER && ce != UCOL_IGNORABLE)) {
                    return TRUE;
                }
            }
        }
    }

    return FALSE;
}

/**
* Used by exact matches, checks if there are accents bounding the match.
* Note this is the initial boundary check. If the potential match
* starts or ends with composite characters, the accents in those
* characters will be determined later.
* Not doing backwards iteration here, since discontiguos contraction for
* backwards collation element iterator, use up too many characters.
* E.g. looking for \u030A ring in \u01FA A ring above and acute,
* should fail since there is a acute at the end of \u01FA
* Note here that accents checking are slow and cautioned in the API docs.
* @param strsrch string search data
* @param start offset of match
* @param end end offset of the match
* @return TRUE if there are accents on either side of the match,
*         FALSE otherwise
*/
static
UBool hasAccentsAfterMatch(const UStringSearch *strsrch, int32_t start,
                                 int32_t    end)
{
    if (strsrch->pattern.hasSuffixAccents) {
        const UChar       *text       = strsrch->search->text;
              int32_t  temp       = end;
              int32_t      textlength = strsrch->search->textLength;
        U16_BACK_1(text, 0, temp);
        if (getFCD(text, &temp, textlength) & LAST_BYTE_MASK_) {
            int32_t             firstce  = strsrch->pattern.CE[0];
            UCollationElements *coleiter = strsrch->textIter;
            UErrorCode          status   = U_ZERO_ERROR;
            int32_t ce;
            setColEIterOffset(coleiter, start);
            while ((ce = getCE(strsrch, ucol_next(coleiter, &status))) != firstce) {
                if (U_FAILURE(status) || ce == UCOL_NULLORDER) {
                    return TRUE;
                }
            }
            int32_t count = 1;
            while (count < strsrch->pattern.CELength) {
                if (getCE(strsrch, ucol_next(coleiter, &status))
                    == UCOL_IGNORABLE) {
                    // Thai can give an ignorable here.
                    count --;
                }
                if (U_FAILURE(status)) {
                    return TRUE;
                }
                count ++;
            }

            ce = ucol_next(coleiter, &status);
            if (U_FAILURE(status)) {
                return TRUE;
            }
            if (ce != UCOL_NULLORDER && ce != UCOL_IGNORABLE) {
                ce = getCE(strsrch, ce);
            }
            if (ce != UCOL_NULLORDER && ce != UCOL_IGNORABLE) {
                if (ucol_getOffset(coleiter) <= end) {
                    return TRUE;
                }
                if (getFCD(text, &end, textlength) >> SECOND_LAST_BYTE_SHIFT_) {
                    return TRUE;
                }
            }
        }
    }
    return FALSE;
}
#endif // #if BOYER_MOORE

/**
* Checks if the offset runs out of the text string
* @param offset
* @param textlength of the text string
* @return TRUE if offset is out of bounds, FALSE otherwise
*/
static
inline UBool isOutOfBounds(int32_t textlength, int32_t offset)
{
    return offset < 0 || offset > textlength;
}

/**
* Checks for identical match
* @param strsrch string search data
* @param start offset of possible match
* @param end offset of possible match
* @return TRUE if identical match is found
*/
static
inline UBool checkIdentical(const UStringSearch *strsrch, int32_t start,
                                  int32_t    end)
{
    if (strsrch->strength != UCOL_IDENTICAL) {
        return TRUE;
    }

    // Note: We could use Normalizer::compare() or similar, but for short strings
    // which may not be in FCD it might be faster to just NFD them.
    UErrorCode status = U_ZERO_ERROR;
    UnicodeString t2, p2;
    strsrch->nfd->normalize(
        UnicodeString(FALSE, strsrch->search->text + start, end - start), t2, status);
    strsrch->nfd->normalize(
        UnicodeString(FALSE, strsrch->pattern.text, strsrch->pattern.textLength), p2, status);
    // return FALSE if NFD failed
    return U_SUCCESS(status) && t2 == p2;
}

#if BOYER_MOORE
/**
* Checks to see if the match is repeated
* @param strsrch string search data
* @param start new match start index
* @param end new match end index
* @return TRUE if the the match is repeated, FALSE otherwise
*/
static
inline UBool checkRepeatedMatch(UStringSearch *strsrch,
                                int32_t    start,
                                int32_t    end)
{
    int32_t lastmatchindex = strsrch->search->matchedIndex;
    UBool       result;
    if (lastmatchindex == USEARCH_DONE) {
        return FALSE;
    }
    if (strsrch->search->isForwardSearching) {
        result = start <= lastmatchindex;
    }
    else {
        result = start >= lastmatchindex;
    }
    if (!result && !strsrch->search->isOverlap) {
        if (strsrch->search->isForwardSearching) {
            result = start < lastmatchindex + strsrch->search->matchedLength;
        }
        else {
            result = end > lastmatchindex;
        }
    }
    return result;
}

/**
* Gets the collation element iterator's current offset.
* @param coleiter collation element iterator
* @param forwards flag TRUE if we are moving in th forwards direction
* @return current offset
*/
static
inline int32_t getColElemIterOffset(const UCollationElements *coleiter,
                                              UBool               forwards)
{
    int32_t result = ucol_getOffset(coleiter);
    // intricacies of the the backwards collation element iterator
    if (FALSE && !forwards && inNormBuf(coleiter) && !isFCDPointerNull(coleiter)) {
        result ++;
    }
    return result;
}

/**
* Checks match for contraction.
* If the match ends with a partial contraction we fail.
* If the match starts too far off (because of backwards iteration) we try to
* chip off the extra characters depending on whether a breakiterator has
* been used.
* Internal method, error assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param start offset of potential match, to be modified if necessary
* @param end offset of potential match, to be modified if necessary
* @param status output error status if any
* @return TRUE if match passes the contraction test, FALSE otherwise
*/

static
UBool checkNextExactContractionMatch(UStringSearch *strsrch,
                                     int32_t   *start,
                                     int32_t   *end, UErrorCode  *status)
{
          UCollationElements *coleiter   = strsrch->textIter;
          int32_t             textlength = strsrch->search->textLength;
          int32_t             temp       = *start;
    const UCollator          *collator   = strsrch->collator;
    const UChar              *text       = strsrch->search->text;
    // This part checks if either ends of the match contains potential
    // contraction. If so we'll have to iterate through them
    // The start contraction needs to be checked since ucol_previous dumps
    // all characters till the first safe character into the buffer.
    // *start + 1 is used to test for the unsafe characters instead of *start
    // because ucol_prev takes all unsafe characters till the first safe
    // character ie *start. so by testing *start + 1, we can estimate if
    // excess prefix characters has been included in the potential search
    // results.
    if ((*end < textlength && ucol_unsafeCP(text[*end], collator)) ||
        (*start + 1 < textlength
         && ucol_unsafeCP(text[*start + 1], collator))) {
        int32_t expansion  = getExpansionPrefix(coleiter);
        UBool   expandflag = expansion > 0;
        setColEIterOffset(coleiter, *start);
        while (expansion > 0) {
            // getting rid of the redundant ce, caused by setOffset.
            // since backward contraction/expansion may have extra ces if we
            // are in the normalization buffer, hasAccentsBeforeMatch would
            // have taken care of it.
            // E.g. the character \u01FA will have an expansion of 3, but if
            // we are only looking for acute and ring \u030A and \u0301, we'll
            // have to skip the first ce in the expansion buffer.
            ucol_next(coleiter, status);
            if (U_FAILURE(*status)) {
                return FALSE;
            }
            if (ucol_getOffset(coleiter) != temp) {
                *start = temp;
                temp  = ucol_getOffset(coleiter);
            }
            expansion --;
        }

        int32_t  *patternce       = strsrch->pattern.CE;
        int32_t   patterncelength = strsrch->pattern.CELength;
        int32_t   count           = 0;
        while (count < patterncelength) {
            int32_t ce = getCE(strsrch, ucol_next(coleiter, status));
            if (ce == UCOL_IGNORABLE) {
                continue;
            }
            if (expandflag && count == 0 && ucol_getOffset(coleiter) != temp) {
                *start = temp;
                temp   = ucol_getOffset(coleiter);
            }
            if (U_FAILURE(*status) || ce != patternce[count]) {
                (*end) ++;
                *end = getNextUStringSearchBaseOffset(strsrch, *end);
                return FALSE;
            }
            count ++;
        }
    }
    return TRUE;
}

/**
* Checks and sets the match information if found.
* Checks
* <ul>
* <li> the potential match does not repeat the previous match
* <li> boundaries are correct
* <li> exact matches has no extra accents
* <li> identical matchesb
* <li> potential match does not end in the middle of a contraction
* <\ul>
* Otherwise the offset will be shifted to the next character.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param textoffset offset in the collation element text. the returned value
*        will be the truncated end offset of the match or the new start
*        search offset.
* @param status output error status if any
* @return TRUE if the match is valid, FALSE otherwise
*/
static
inline UBool checkNextExactMatch(UStringSearch *strsrch,
                                 int32_t   *textoffset, UErrorCode *status)
{
    UCollationElements *coleiter = strsrch->textIter;
    int32_t         start    = getColElemIterOffset(coleiter, FALSE);

    if (!checkNextExactContractionMatch(strsrch, &start, textoffset, status)) {
        return FALSE;
    }

    // this totally matches, however we need to check if it is repeating
    if (!isBreakUnit(strsrch, start, *textoffset) ||
        checkRepeatedMatch(strsrch, start, *textoffset) ||
        hasAccentsBeforeMatch(strsrch, start, *textoffset) ||
        !checkIdentical(strsrch, start, *textoffset) ||
        hasAccentsAfterMatch(strsrch, start, *textoffset)) {

        (*textoffset) ++;
        *textoffset = getNextUStringSearchBaseOffset(strsrch, *textoffset);
        return FALSE;
    }

    //Add breakiterator boundary check for primary strength search.
    if (!strsrch->search->breakIter && strsrch->strength == UCOL_PRIMARY) {
        checkBreakBoundary(strsrch, &start, textoffset);
    }

    // totally match, we will get rid of the ending ignorables.
    strsrch->search->matchedIndex  = start;
    strsrch->search->matchedLength = *textoffset - start;
    return TRUE;
}

/**
* Getting the previous base character offset, or the current offset if the
* current character is a base character
* @param text string
* @param textoffset one offset after the current character
* @return the offset of the next character after the base character or the first
*         composed character with accents
*/
static
inline int32_t getPreviousBaseOffset(const UChar       *text,
                                               int32_t  textoffset)
{
    if (textoffset > 0) {
        for (;;) {
            int32_t result = textoffset;
            U16_BACK_1(text, 0, textoffset);
            int32_t temp = textoffset;
            uint16_t fcd = getFCD(text, &temp, result);
            if ((fcd >> SECOND_LAST_BYTE_SHIFT_) == 0) {
                if (fcd & LAST_BYTE_MASK_) {
                    return textoffset;
                }
                return result;
            }
            if (textoffset == 0) {
                return 0;
            }
        }
    }
    return textoffset;
}

/**
* Getting the indexes of the accents that are not blocked in the argument
* accent array
* @param accents array of accents in nfd terminated by a 0.
* @param accentsindex array of indexes of the accents that are not blocked
*/
static
inline int getUnblockedAccentIndex(UChar *accents, int32_t *accentsindex)
{
    int32_t index     = 0;
    int32_t     length    = u_strlen(accents);
    UChar32     codepoint = 0;
    int         cclass    = 0;
    int         result    = 0;
    int32_t temp;
    while (index < length) {
        temp = index;
        U16_NEXT(accents, index, length, codepoint);
        if (u_getCombiningClass(codepoint) != cclass) {
            cclass        = u_getCombiningClass(codepoint);
            accentsindex[result] = temp;
            result ++;
        }
    }
    accentsindex[result] = length;
    return result;
}

/**
* Appends 3 UChar arrays to a destination array.
* Creates a new array if we run out of space. The caller will have to
* manually deallocate the newly allocated array.
* Internal method, status assumed to be success, caller has to check status
* before calling this method. destination not to be NULL and has at least
* size destinationlength.
* @param destination target array
* @param destinationlength target array size, returning the appended length
* @param source1 null-terminated first array
* @param source2 second array
* @param source2length length of seond array
* @param source3 null-terminated third array
* @param status error status if any
* @return new destination array, destination if there was no new allocation
*/
static
inline UChar * addToUCharArray(      UChar      *destination,
                                     int32_t    *destinationlength,
                               const UChar      *source1,
                               const UChar      *source2,
                                     int32_t     source2length,
                               const UChar      *source3,
                                     UErrorCode *status)
{
    int32_t source1length = source1 ? u_strlen(source1) : 0;
    int32_t source3length = source3 ? u_strlen(source3) : 0;
    if (*destinationlength < source1length + source2length + source3length +
                                                                           1)
    {
        destination = (UChar *)allocateMemory(
          (source1length + source2length + source3length + 1) * sizeof(UChar),
          status);
        // if error allocating memory, status will be
        // U_MEMORY_ALLOCATION_ERROR
        if (U_FAILURE(*status)) {
            *destinationlength = 0;
            return NULL;
        }
    }
    if (source1length != 0) {
        uprv_memcpy(destination, source1, sizeof(UChar) * source1length);
    }
    if (source2length != 0) {
        uprv_memcpy(destination + source1length, source2,
                    sizeof(UChar) * source2length);
    }
    if (source3length != 0) {
        uprv_memcpy(destination + source1length + source2length, source3,
                    sizeof(UChar) * source3length);
    }
    *destinationlength = source1length + source2length + source3length;
    return destination;
}

/**
* Running through a collation element iterator to see if the contents matches
* pattern in string search data
* @param strsrch string search data
* @param coleiter collation element iterator
* @return TRUE if a match if found, FALSE otherwise
*/
static
inline UBool checkCollationMatch(const UStringSearch      *strsrch,
                                       UCollationElements *coleiter)
{
    int         patternceindex = strsrch->pattern.CELength;
    int32_t    *patternce      = strsrch->pattern.CE;
    UErrorCode  status = U_ZERO_ERROR;
    while (patternceindex > 0) {
        int32_t ce = getCE(strsrch, ucol_next(coleiter, &status));
        if (ce == UCOL_IGNORABLE) {
            continue;
        }
        if (U_FAILURE(status) || ce != *patternce) {
            return FALSE;
        }
        patternce ++;
        patternceindex --;
    }
    return TRUE;
}

/**
* Rearranges the front accents to try matching.
* Prefix accents in the text will be grouped according to their combining
* class and the groups will be mixed and matched to try find the perfect
* match with the pattern.
* So for instance looking for "\u0301" in "\u030A\u0301\u0325"
* step 1: split "\u030A\u0301" into 6 other type of potential accent substrings
*         "\u030A", "\u0301", "\u0325", "\u030A\u0301", "\u030A\u0325",
*         "\u0301\u0325".
* step 2: check if any of the generated substrings matches the pattern.
* Internal method, status is assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search match
* @param start first offset of the accents to start searching
* @param end start of the last accent set
* @param status output error status if any
* @return USEARCH_DONE if a match is not found, otherwise return the starting
*         offset of the match. Note this start includes all preceding accents.
*/
static
int32_t doNextCanonicalPrefixMatch(UStringSearch *strsrch,
                                       int32_t    start,
                                       int32_t    end,
                                       UErrorCode    *status)
{
    const UChar       *text       = strsrch->search->text;
          int32_t      textlength = strsrch->search->textLength;
          int32_t  tempstart  = start;

    if ((getFCD(text, &tempstart, textlength) & LAST_BYTE_MASK_) == 0) {
        // die... failed at a base character
        return USEARCH_DONE;
    }

    int32_t offset = getNextBaseOffset(text, tempstart, textlength);
    start = getPreviousBaseOffset(text, tempstart);

    UChar       accents[INITIAL_ARRAY_SIZE_];
    // normalizing the offensive string
    unorm_normalize(text + start, offset - start, UNORM_NFD, 0, accents,
                    INITIAL_ARRAY_SIZE_, status);
    if (U_FAILURE(*status)) {
        return USEARCH_DONE;
    }

    int32_t         accentsindex[INITIAL_ARRAY_SIZE_];
    int32_t         accentsize = getUnblockedAccentIndex(accents,
                                                                 accentsindex);
    int32_t         count      = (2 << (accentsize - 1)) - 1;
    UChar               buffer[INITIAL_ARRAY_SIZE_];
    UCollationElements *coleiter   = strsrch->utilIter;
    while (U_SUCCESS(*status) && count > 0) {
        UChar *rearrange = strsrch->canonicalPrefixAccents;
        // copy the base characters
        for (int k = 0; k < accentsindex[0]; k ++) {
            *rearrange ++ = accents[k];
        }
        // forming all possible canonical rearrangement by dropping
        // sets of accents
        for (int i = 0; i <= accentsize - 1; i ++) {
            int32_t mask = 1 << (accentsize - i - 1);
            if (count & mask) {
                for (int j = accentsindex[i]; j < accentsindex[i + 1]; j ++) {
                    *rearrange ++ = accents[j];
                }
            }
        }
        *rearrange = 0;
        int32_t  matchsize = INITIAL_ARRAY_SIZE_;
        UChar   *match     = addToUCharArray(buffer, &matchsize,
                                           strsrch->canonicalPrefixAccents,
                                           strsrch->search->text + offset,
                                           end - offset,
                                           strsrch->canonicalSuffixAccents,
                                           status);

        // if status is a failure, ucol_setText does nothing.
        // run the collator iterator through this match
        ucol_setText(coleiter, match, matchsize, status);
        if (U_SUCCESS(*status)) {
            if (checkCollationMatch(strsrch, coleiter)) {
                if (match != buffer) {
                    uprv_free(match);
                }
                return start;
            }
        }
        count --;
    }
    return USEARCH_DONE;
}

/**
* Gets the offset to the safe point in text before textoffset.
* ie. not the middle of a contraction, swappable characters or supplementary
* characters.
* @param collator collation sata
* @param text string to work with
* @param textoffset offset in string
* @param textlength length of text string
* @return offset to the previous safe character
*/
static
inline uint32_t getPreviousSafeOffset(const UCollator   *collator,
                                      const UChar       *text,
                                            int32_t  textoffset)
{
    int32_t result = textoffset; // first contraction character
    while (result != 0 && ucol_unsafeCP(text[result - 1], collator)) {
        result --;
    }
    if (result != 0) {
        // the first contraction character is consider unsafe here
        result --;
    }
    return result;
}

/**
* Cleaning up after we passed the safe zone
* @param strsrch string search data
* @param safetext safe text array
* @param safebuffer safe text buffer
* @param coleiter collation element iterator for safe text
*/
static
inline void cleanUpSafeText(const UStringSearch *strsrch, UChar *safetext,
                                  UChar         *safebuffer)
{
    if (safetext != safebuffer && safetext != strsrch->canonicalSuffixAccents)
    {
       uprv_free(safetext);
    }
}

/**
* Take the rearranged end accents and tries matching. If match failed at
* a seperate preceding set of accents (seperated from the rearranged on by
* at least a base character) then we rearrange the preceding accents and
* tries matching again.
* We allow skipping of the ends of the accent set if the ces do not match.
* However if the failure is found before the accent set, it fails.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param textoffset of the start of the rearranged accent
* @param status output error status if any
* @return USEARCH_DONE if a match is not found, otherwise return the starting
*         offset of the match. Note this start includes all preceding accents.
*/
static
int32_t doNextCanonicalSuffixMatch(UStringSearch *strsrch,
                                       int32_t    textoffset,
                                       UErrorCode    *status)
{
    const UChar              *text           = strsrch->search->text;
    const UCollator          *collator       = strsrch->collator;
          int32_t             safelength     = 0;
          UChar              *safetext;
          int32_t             safetextlength;
          UChar               safebuffer[INITIAL_ARRAY_SIZE_];
          UCollationElements *coleiter       = strsrch->utilIter;
          int32_t         safeoffset     = textoffset;

    if (textoffset != 0 && ucol_unsafeCP(strsrch->canonicalSuffixAccents[0],
                                         collator)) {
        safeoffset     = getPreviousSafeOffset(collator, text, textoffset);
        safelength     = textoffset - safeoffset;
        safetextlength = INITIAL_ARRAY_SIZE_;
        safetext       = addToUCharArray(safebuffer, &safetextlength, NULL,
                                         text + safeoffset, safelength,
                                         strsrch->canonicalSuffixAccents,
                                         status);
    }
    else {
        safetextlength = u_strlen(strsrch->canonicalSuffixAccents);
        safetext       = strsrch->canonicalSuffixAccents;
    }

    // if status is a failure, ucol_setText does nothing
    ucol_setText(coleiter, safetext, safetextlength, status);
    // status checked in loop below

    int32_t  *ce        = strsrch->pattern.CE;
    int32_t   celength  = strsrch->pattern.CELength;
    int       ceindex   = celength - 1;
    UBool     isSafe    = TRUE; // indication flag for position in safe zone

    while (ceindex >= 0) {
        int32_t textce = ucol_previous(coleiter, status);
        if (U_FAILURE(*status)) {
            if (isSafe) {
                cleanUpSafeText(strsrch, safetext, safebuffer);
            }
            return USEARCH_DONE;
        }
        if (textce == UCOL_NULLORDER) {
            // check if we have passed the safe buffer
            if (coleiter == strsrch->textIter) {
                cleanUpSafeText(strsrch, safetext, safebuffer);
                return USEARCH_DONE;
            }
            cleanUpSafeText(strsrch, safetext, safebuffer);
            safetext = safebuffer;
            coleiter = strsrch->textIter;
            setColEIterOffset(coleiter, safeoffset);
            // status checked at the start of the loop
            isSafe = FALSE;
            continue;
        }
        textce = getCE(strsrch, textce);
        if (textce != UCOL_IGNORABLE && textce != ce[ceindex]) {
            // do the beginning stuff
            int32_t failedoffset = getColElemIterOffset(coleiter, FALSE);
            if (isSafe && failedoffset >= safelength) {
                // alas... no hope. failed at rearranged accent set
                cleanUpSafeText(strsrch, safetext, safebuffer);
                return USEARCH_DONE;
            }
            else {
                if (isSafe) {
                    failedoffset += safeoffset;
                    cleanUpSafeText(strsrch, safetext, safebuffer);
                }

                // try rearranging the front accents
                int32_t result = doNextCanonicalPrefixMatch(strsrch,
                                        failedoffset, textoffset, status);
                if (result != USEARCH_DONE) {
                    // if status is a failure, ucol_setOffset does nothing
                    setColEIterOffset(strsrch->textIter, result);
                }
                if (U_FAILURE(*status)) {
                    return USEARCH_DONE;
                }
                return result;
            }
        }
        if (textce == ce[ceindex]) {
            ceindex --;
        }
    }
    // set offset here
    if (isSafe) {
        int32_t result     = getColElemIterOffset(coleiter, FALSE);
        // sets the text iterator here with the correct expansion and offset
        int32_t    leftoverces = getExpansionPrefix(coleiter);
        cleanUpSafeText(strsrch, safetext, safebuffer);
        if (result >= safelength) {
            result = textoffset;
        }
        else {
            result += safeoffset;
        }
        setColEIterOffset(strsrch->textIter, result);
        strsrch->textIter->iteratordata_.toReturn =
                       setExpansionPrefix(strsrch->textIter, leftoverces);
        return result;
    }

    return ucol_getOffset(coleiter);
}

/**
* Trying out the substring and sees if it can be a canonical match.
* This will try normalizing the end accents and arranging them into canonical
* equivalents and check their corresponding ces with the pattern ce.
* Suffix accents in the text will be grouped according to their combining
* class and the groups will be mixed and matched to try find the perfect
* match with the pattern.
* So for instance looking for "\u0301" in "\u030A\u0301\u0325"
* step 1: split "\u030A\u0301" into 6 other type of potential accent substrings
*         "\u030A", "\u0301", "\u0325", "\u030A\u0301", "\u030A\u0325",
*         "\u0301\u0325".
* step 2: check if any of the generated substrings matches the pattern.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param textoffset end offset in the collation element text that ends with
*                   the accents to be rearranged
* @param status error status if any
* @return TRUE if the match is valid, FALSE otherwise
*/
static
UBool doNextCanonicalMatch(UStringSearch *strsrch,
                           int32_t    textoffset,
                           UErrorCode    *status)
{
    const UChar       *text = strsrch->search->text;
          int32_t  temp = textoffset;
    U16_BACK_1(text, 0, temp);
    if ((getFCD(text, &temp, textoffset) & LAST_BYTE_MASK_) == 0) {
        UCollationElements *coleiter = strsrch->textIter;
        int32_t         offset   = getColElemIterOffset(coleiter, FALSE);
        if (strsrch->pattern.hasPrefixAccents) {
            offset = doNextCanonicalPrefixMatch(strsrch, offset, textoffset,
                                                status);
            if (U_SUCCESS(*status) && offset != USEARCH_DONE) {
                setColEIterOffset(coleiter, offset);
                return TRUE;
            }
        }
        return FALSE;
    }

    if (!strsrch->pattern.hasSuffixAccents) {
        return FALSE;
    }

    UChar       accents[INITIAL_ARRAY_SIZE_];
    // offset to the last base character in substring to search
    int32_t baseoffset = getPreviousBaseOffset(text, textoffset);
    // normalizing the offensive string
    unorm_normalize(text + baseoffset, textoffset - baseoffset, UNORM_NFD,
                               0, accents, INITIAL_ARRAY_SIZE_, status);
    // status checked in loop below

    int32_t accentsindex[INITIAL_ARRAY_SIZE_];
    int32_t size = getUnblockedAccentIndex(accents, accentsindex);

    // 2 power n - 1 plus the full set of accents
    int32_t  count = (2 << (size - 1)) - 1;
    while (U_SUCCESS(*status) && count > 0) {
        UChar *rearrange = strsrch->canonicalSuffixAccents;
        // copy the base characters
        for (int k = 0; k < accentsindex[0]; k ++) {
            *rearrange ++ = accents[k];
        }
        // forming all possible canonical rearrangement by dropping
        // sets of accents
        for (int i = 0; i <= size - 1; i ++) {
            int32_t mask = 1 << (size - i - 1);
            if (count & mask) {
                for (int j = accentsindex[i]; j < accentsindex[i + 1]; j ++) {
                    *rearrange ++ = accents[j];
                }
            }
        }
        *rearrange = 0;
        int32_t offset = doNextCanonicalSuffixMatch(strsrch, baseoffset,
                                                        status);
        if (offset != USEARCH_DONE) {
            return TRUE; // match found
        }
        count --;
    }
    return FALSE;
}

/**
* Gets the previous base character offset depending on the string search
* pattern data
* @param strsrch string search data
* @param textoffset current offset, current character
* @return the offset of the next character after this base character or itself
*         if it is a composed character with accents
*/
static
inline int32_t getPreviousUStringSearchBaseOffset(UStringSearch *strsrch,
                                                      int32_t textoffset)
{
    if (strsrch->pattern.hasPrefixAccents && textoffset > 0) {
        const UChar       *text = strsrch->search->text;
              int32_t  offset = textoffset;
        if (getFCD(text, &offset, strsrch->search->textLength) >>
                                                   SECOND_LAST_BYTE_SHIFT_) {
            return getPreviousBaseOffset(text, textoffset);
        }
    }
    return textoffset;
}

/**
* Checks match for contraction.
* If the match ends with a partial contraction we fail.
* If the match starts too far off (because of backwards iteration) we try to
* chip off the extra characters
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param start offset of potential match, to be modified if necessary
* @param end offset of potential match, to be modified if necessary
* @param status output error status if any
* @return TRUE if match passes the contraction test, FALSE otherwise
*/
static
UBool checkNextCanonicalContractionMatch(UStringSearch *strsrch,
                                         int32_t   *start,
                                         int32_t   *end,
                                         UErrorCode    *status)
{
          UCollationElements *coleiter   = strsrch->textIter;
          int32_t             textlength = strsrch->search->textLength;
          int32_t         temp       = *start;
    const UCollator          *collator   = strsrch->collator;
    const UChar              *text       = strsrch->search->text;
    // This part checks if either ends of the match contains potential
    // contraction. If so we'll have to iterate through them
    if ((*end < textlength && ucol_unsafeCP(text[*end], collator)) ||
        (*start + 1 < textlength
         && ucol_unsafeCP(text[*start + 1], collator))) {
        int32_t expansion  = getExpansionPrefix(coleiter);
        UBool   expandflag = expansion > 0;
        setColEIterOffset(coleiter, *start);
        while (expansion > 0) {
            // getting rid of the redundant ce, caused by setOffset.
            // since backward contraction/expansion may have extra ces if we
            // are in the normalization buffer, hasAccentsBeforeMatch would
            // have taken care of it.
            // E.g. the character \u01FA will have an expansion of 3, but if
            // we are only looking for acute and ring \u030A and \u0301, we'll
            // have to skip the first ce in the expansion buffer.
            ucol_next(coleiter, status);
            if (U_FAILURE(*status)) {
                return FALSE;
            }
            if (ucol_getOffset(coleiter) != temp) {
                *start = temp;
                temp  = ucol_getOffset(coleiter);
            }
            expansion --;
        }

        int32_t  *patternce       = strsrch->pattern.CE;
        int32_t   patterncelength = strsrch->pattern.CELength;
        int32_t   count           = 0;
        int32_t   textlength      = strsrch->search->textLength;
        while (count < patterncelength) {
            int32_t ce = getCE(strsrch, ucol_next(coleiter, status));
            // status checked below, note that if status is a failure
            // ucol_next returns UCOL_NULLORDER
            if (ce == UCOL_IGNORABLE) {
                continue;
            }
            if (expandflag && count == 0 && ucol_getOffset(coleiter) != temp) {
                *start = temp;
                temp   = ucol_getOffset(coleiter);
            }

            if (count == 0 && ce != patternce[0]) {
                // accents may have extra starting ces, this occurs when a
                // pure accent pattern is matched without rearrangement
                // text \u0325\u0300 and looking for \u0300
                int32_t expected = patternce[0];
                if (getFCD(text, start, textlength) & LAST_BYTE_MASK_) {
                    ce = getCE(strsrch, ucol_next(coleiter, status));
                    while (U_SUCCESS(*status) && ce != expected &&
                           ce != UCOL_NULLORDER &&
                           ucol_getOffset(coleiter) <= *end) {
                        ce = getCE(strsrch, ucol_next(coleiter, status));
                    }
                }
            }
            if (U_FAILURE(*status) || ce != patternce[count]) {
                (*end) ++;
                *end = getNextUStringSearchBaseOffset(strsrch, *end);
                return FALSE;
            }
            count ++;
        }
    }
    return TRUE;
}

/**
* Checks and sets the match information if found.
* Checks
* <ul>
* <li> the potential match does not repeat the previous match
* <li> boundaries are correct
* <li> potential match does not end in the middle of a contraction
* <li> identical matches
* <\ul>
* Otherwise the offset will be shifted to the next character.
* Internal method, status assumed to be success, caller has to check the
* status before calling this method.
* @param strsrch string search data
* @param textoffset offset in the collation element text. the returned value
*        will be the truncated end offset of the match or the new start
*        search offset.
* @param status output error status if any
* @return TRUE if the match is valid, FALSE otherwise
*/
static
inline UBool checkNextCanonicalMatch(UStringSearch *strsrch,
                                     int32_t   *textoffset,
                                     UErrorCode    *status)
{
    // to ensure that the start and ends are not composite characters
    UCollationElements *coleiter = strsrch->textIter;
    // if we have a canonical accent match
    if ((strsrch->pattern.hasSuffixAccents &&
        strsrch->canonicalSuffixAccents[0]) ||
        (strsrch->pattern.hasPrefixAccents &&
        strsrch->canonicalPrefixAccents[0])) {
        strsrch->search->matchedIndex  = getPreviousUStringSearchBaseOffset(
                                                    strsrch,
                                                    ucol_getOffset(coleiter));
        strsrch->search->matchedLength = *textoffset -
                                                strsrch->search->matchedIndex;
        return TRUE;
    }

    int32_t start = getColElemIterOffset(coleiter, FALSE);
    if (!checkNextCanonicalContractionMatch(strsrch, &start, textoffset,
                                            status) || U_FAILURE(*status)) {
        return FALSE;
    }

    start = getPreviousUStringSearchBaseOffset(strsrch, start);
    // this totally matches, however we need to check if it is repeating
    if (checkRepeatedMatch(strsrch, start, *textoffset) ||
        !isBreakUnit(strsrch, start, *textoffset) ||
        !checkIdentical(strsrch, start, *textoffset)) {
        (*textoffset) ++;
        *textoffset = getNextBaseOffset(strsrch->search->text, *textoffset,
                                        strsrch->search->textLength);
        return FALSE;
    }

    strsrch->search->matchedIndex  = start;
    strsrch->search->matchedLength = *textoffset - start;
    return TRUE;
}

/**
* Shifting the collation element iterator position forward to prepare for
* a preceding match. If the first character is a unsafe character, we'll only
* shift by 1 to capture contractions, normalization etc.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param text strsrch string search data
* @param textoffset start text position to do search
* @param ce the text ce which failed the match.
* @param patternceindex index of the ce within the pattern ce buffer which
*        failed the match
* @return final offset
*/
static
inline int32_t reverseShift(UStringSearch *strsrch,
                                int32_t    textoffset,
                                int32_t       ce,
                                int32_t        patternceindex)
{
    if (strsrch->search->isOverlap) {
        if (textoffset != strsrch->search->textLength) {
            textoffset --;
        }
        else {
            textoffset -= strsrch->pattern.defaultShiftSize;
        }
    }
    else {
        if (ce != UCOL_NULLORDER) {
            int32_t shift = strsrch->pattern.backShift[hash(ce)];

            // this is to adjust for characters in the middle of the substring
            // for matching that failed.
            int32_t adjust = patternceindex;
            if (adjust > 1 && shift > adjust) {
                shift -= adjust - 1;
            }
            textoffset -= shift;
        }
        else {
            textoffset -= strsrch->pattern.defaultShiftSize;
        }
    }
    textoffset = getPreviousUStringSearchBaseOffset(strsrch, textoffset);
    return textoffset;
}

/**
* Checks match for contraction.
* If the match starts with a partial contraction we fail.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param start offset of potential match, to be modified if necessary
* @param end offset of potential match, to be modified if necessary
* @param status output error status if any
* @return TRUE if match passes the contraction test, FALSE otherwise
*/
static
UBool checkPreviousExactContractionMatch(UStringSearch *strsrch,
                                     int32_t   *start,
                                     int32_t   *end, UErrorCode  *status)
{
          UCollationElements *coleiter   = strsrch->textIter;
          int32_t             textlength = strsrch->search->textLength;
          int32_t             temp       = *end;
    const UCollator          *collator   = strsrch->collator;
    const UChar              *text       = strsrch->search->text;
    // This part checks if either if the start of the match contains potential
    // contraction. If so we'll have to iterate through them
    // Since we used ucol_next while previously looking for the potential
    // match, this guarantees that our end will not be a partial contraction,
    // or a partial supplementary character.
    if (*start < textlength && ucol_unsafeCP(text[*start], collator)) {
        int32_t expansion  = getExpansionSuffix(coleiter);
        UBool   expandflag = expansion > 0;
        setColEIterOffset(coleiter, *end);
        while (U_SUCCESS(*status) && expansion > 0) {
            // getting rid of the redundant ce
            // since forward contraction/expansion may have extra ces
            // if we are in the normalization buffer, hasAccentsBeforeMatch
            // would have taken care of it.
            // E.g. the character \u01FA will have an expansion of 3, but if
            // we are only looking for A ring A\u030A, we'll have to skip the
            // last ce in the expansion buffer
            ucol_previous(coleiter, status);
            if (U_FAILURE(*status)) {
                return FALSE;
            }
            if (ucol_getOffset(coleiter) != temp) {
                *end = temp;
                temp  = ucol_getOffset(coleiter);
            }
            expansion --;
        }

        int32_t  *patternce       = strsrch->pattern.CE;
        int32_t   patterncelength = strsrch->pattern.CELength;
        int32_t   count           = patterncelength;
        while (count > 0) {
            int32_t ce = getCE(strsrch, ucol_previous(coleiter, status));
            // status checked below, note that if status is a failure
            // ucol_previous returns UCOL_NULLORDER
            if (ce == UCOL_IGNORABLE) {
                continue;
            }
            if (expandflag && count == 0 &&
                getColElemIterOffset(coleiter, FALSE) != temp) {
                *end = temp;
                temp  = ucol_getOffset(coleiter);
            }
            if (U_FAILURE(*status) || ce != patternce[count - 1]) {
                (*start) --;
                *start = getPreviousBaseOffset(text, *start);
                return FALSE;
            }
            count --;
        }
    }
    return TRUE;
}

/**
* Checks and sets the match information if found.
* Checks
* <ul>
* <li> the current match does not repeat the last match
* <li> boundaries are correct
* <li> exact matches has no extra accents
* <li> identical matches
* <\ul>
* Otherwise the offset will be shifted to the preceding character.
* Internal method, status assumed to be success, caller has to check status
* before calling this method.
* @param strsrch string search data
* @param collator
* @param coleiter collation element iterator
* @param text string
* @param textoffset offset in the collation element text. the returned value
*        will be the truncated start offset of the match or the new start
*        search offset.
* @param status output error status if any
* @return TRUE if the match is valid, FALSE otherwise
*/
static
inline UBool checkPreviousExactMatch(UStringSearch *strsrch,
                                     int32_t   *textoffset,
                                     UErrorCode    *status)
{
    // to ensure that the start and ends are not composite characters
    int32_t end = ucol_getOffset(strsrch->textIter);