spell.c

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/*-------------------------------------------------------------------------
 *
 * spell.c
 *      Normalizing word with ISpell
 *
 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
 *
 *
 * IDENTIFICATION
 *    src/backend/tsearch/spell.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres.h"

#include "catalog/pg_collation.h"
#include "tsearch/dicts/spell.h"
#include "tsearch/ts_locale.h"
#include "utils/memutils.h"


/*
 * Initialization requires a lot of memory that's not needed
 * after the initialization is done.  During initialization,
 * CurrentMemoryContext is the long-lived memory context associated
 * with the dictionary cache entry.  We keep the short-lived stuff
 * in the Conf->buildCxt context.
 */
#define tmpalloc(sz)  MemoryContextAlloc(Conf->buildCxt, (sz))
#define tmpalloc0(sz)  MemoryContextAllocZero(Conf->buildCxt, (sz))

/*
 * Prepare for constructing an ISpell dictionary.
 *
 * The IspellDict struct is assumed to be zeroed when allocated.
 */
void
NIStartBuild(IspellDict *Conf)
{
    /*
     * The temp context is a child of CurTransactionContext, so that it will
     * go away automatically on error.
     */
    Conf->buildCxt = AllocSetContextCreate(CurTransactionContext,
                                           "Ispell dictionary init context",
                                           ALLOCSET_DEFAULT_MINSIZE,
                                           ALLOCSET_DEFAULT_INITSIZE,
                                           ALLOCSET_DEFAULT_MAXSIZE);
}

/*
 * Clean up when dictionary construction is complete.
 */
void
NIFinishBuild(IspellDict *Conf)
{
    /* Release no-longer-needed temp memory */
    MemoryContextDelete(Conf->buildCxt);
    /* Just for cleanliness, zero the now-dangling pointers */
    Conf->buildCxt = NULL;
    Conf->Spell = NULL;
    Conf->firstfree = NULL;
}


/*
 * "Compact" palloc: allocate without extra palloc overhead.
 *
 * Since we have no need to free the ispell data items individually, there's
 * not much value in the per-chunk overhead normally consumed by palloc.
 * Getting rid of it is helpful since ispell can allocate a lot of small nodes.
 *
 * We currently pre-zero all data allocated this way, even though some of it
 * doesn't need that.  The cpalloc and cpalloc0 macros are just documentation
 * to indicate which allocations actually require zeroing.
 */
#define COMPACT_ALLOC_CHUNK 8192    /* amount to get from palloc at once */
#define COMPACT_MAX_REQ     1024    /* must be < COMPACT_ALLOC_CHUNK */

static void *
compact_palloc0(IspellDict *Conf, size_t size)
{
    void       *result;

    /* Should only be called during init */
    Assert(Conf->buildCxt != NULL);

    /* No point in this for large chunks */
    if (size > COMPACT_MAX_REQ)
        return palloc0(size);

    /* Keep everything maxaligned */
    size = MAXALIGN(size);

    /* Need more space? */
    if (size > Conf->avail)
    {
        Conf->firstfree = palloc0(COMPACT_ALLOC_CHUNK);
        Conf->avail = COMPACT_ALLOC_CHUNK;
    }

    result = (void *) Conf->firstfree;
    Conf->firstfree += size;
    Conf->avail -= size;

    return result;
}

#define cpalloc(size) compact_palloc0(Conf, size)
#define cpalloc0(size) compact_palloc0(Conf, size)

static char *
cpstrdup(IspellDict *Conf, const char *str)
{
    char       *res = cpalloc(strlen(str) + 1);

    strcpy(res, str);
    return res;
}


/*
 * Apply lowerstr(), producing a temporary result (in the buildCxt).
 */
static char *
lowerstr_ctx(IspellDict *Conf, const char *src)
{
    MemoryContext saveCtx;
    char       *dst;

    saveCtx = MemoryContextSwitchTo(Conf->buildCxt);
    dst = lowerstr(src);
    MemoryContextSwitchTo(saveCtx);

    return dst;
}

#define MAX_NORM 1024
#define MAXNORMLEN 256

#define STRNCMP(s,p)    strncmp( (s), (p), strlen(p) )
#define GETWCHAR(W,L,N,T) ( ((const uint8*)(W))[ ((T)==FF_PREFIX) ? (N) : ( (L) - 1 - (N) ) ] )
#define GETCHAR(A,N,T)    GETWCHAR( (A)->repl, (A)->replen, N, T )

static char *VoidString = "";

static int
cmpspell(const void *s1, const void *s2)
{
    return (strcmp((*(SPELL *const *) s1)->word, (*(SPELL *const *) s2)->word));
}
static int
cmpspellaffix(const void *s1, const void *s2)
{
    return (strncmp((*(SPELL *const *) s1)->p.flag, (*(SPELL *const *) s2)->p.flag, MAXFLAGLEN));
}

static char *
findchar(char *str, int c)
{
    while (*str)
    {
        if (t_iseq(str, c))
            return str;
        str += pg_mblen(str);
    }

    return NULL;
}


/* backward string compare for suffix tree operations */
static int
strbcmp(const unsigned char *s1, const unsigned char *s2)
{
    int         l1 = strlen((const char *) s1) - 1,
                l2 = strlen((const char *) s2) - 1;

    while (l1 >= 0 && l2 >= 0)
    {
        if (s1[l1] < s2[l2])
            return -1;
        if (s1[l1] > s2[l2])
            return 1;
        l1--;
        l2--;
    }
    if (l1 < l2)
        return -1;
    if (l1 > l2)
        return 1;

    return 0;
}

static int
strbncmp(const unsigned char *s1, const unsigned char *s2, size_t count)
{
    int         l1 = strlen((const char *) s1) - 1,
                l2 = strlen((const char *) s2) - 1,
                l = count;

    while (l1 >= 0 && l2 >= 0 && l > 0)
    {
        if (s1[l1] < s2[l2])
            return -1;
        if (s1[l1] > s2[l2])
            return 1;
        l1--;
        l2--;
        l--;
    }
    if (l == 0)
        return 0;
    if (l1 < l2)
        return -1;
    if (l1 > l2)
        return 1;
    return 0;
}

static int
cmpaffix(const void *s1, const void *s2)
{
    const AFFIX *a1 = (const AFFIX *) s1;
    const AFFIX *a2 = (const AFFIX *) s2;

    if (a1->type < a2->type)
        return -1;
    if (a1->type > a2->type)
        return 1;
    if (a1->type == FF_PREFIX)
        return strcmp(a1->repl, a2->repl);
    else
        return strbcmp((const unsigned char *) a1->repl,
                       (const unsigned char *) a2->repl);
}

static void
NIAddSpell(IspellDict *Conf, const char *word, const char *flag)
{
    if (Conf->nspell >= Conf->mspell)
    {
        if (Conf->mspell)
        {
            Conf->mspell *= 2;
            Conf->Spell = (SPELL **) repalloc(Conf->Spell, Conf->mspell * sizeof(SPELL *));
        }
        else
        {
            Conf->mspell = 1024 * 20;
            Conf->Spell = (SPELL **) tmpalloc(Conf->mspell * sizeof(SPELL *));
        }
    }
    Conf->Spell[Conf->nspell] = (SPELL *) tmpalloc(SPELLHDRSZ + strlen(word) + 1);
    strcpy(Conf->Spell[Conf->nspell]->word, word);
    strncpy(Conf->Spell[Conf->nspell]->p.flag, flag, MAXFLAGLEN);
    Conf->nspell++;
}

/*
 * import dictionary
 *
 * Note caller must already have applied get_tsearch_config_filename
 */
void
NIImportDictionary(IspellDict *Conf, const char *filename)
{
    tsearch_readline_state trst;
    char       *line;

    if (!tsearch_readline_begin(&trst, filename))
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("could not open dictionary file \"%s\": %m",
                        filename)));

    while ((line = tsearch_readline(&trst)) != NULL)
    {
        char       *s,
                   *pstr;
        const char *flag;

        /* Extract flag from the line */
        flag = NULL;
        if ((s = findchar(line, '/')))
        {
            *s++ = '\0';
            flag = s;
            while (*s)
            {
                /* we allow only single encoded flags for faster works */
                if (pg_mblen(s) == 1 && t_isprint(s) && !t_isspace(s))
                    s++;
                else
                {
                    *s = '\0';
                    break;
                }
            }
        }
        else
            flag = "";

        /* Remove trailing spaces */
        s = line;
        while (*s)
        {
            if (t_isspace(s))
            {
                *s = '\0';
                break;
            }
            s += pg_mblen(s);
        }
        pstr = lowerstr_ctx(Conf, line);

        NIAddSpell(Conf, pstr, flag);
        pfree(pstr);

        pfree(line);
    }
    tsearch_readline_end(&trst);
}


static int
FindWord(IspellDict *Conf, const char *word, int affixflag, int flag)
{
    SPNode     *node = Conf->Dictionary;
    SPNodeData *StopLow,
               *StopHigh,
               *StopMiddle;
    const uint8 *ptr = (const uint8 *) word;

    flag &= FF_DICTFLAGMASK;

    while (node && *ptr)
    {
        StopLow = node->data;
        StopHigh = node->data + node->length;
        while (StopLow < StopHigh)
        {
            StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
            if (StopMiddle->val == *ptr)
            {
                if (*(ptr + 1) == '\0' && StopMiddle->isword)
                {
                    if (flag == 0)
                    {
                        if (StopMiddle->compoundflag & FF_COMPOUNDONLY)
                            return 0;
                    }
                    else if ((flag & StopMiddle->compoundflag) == 0)
                        return 0;

                    if ((affixflag == 0) || (strchr(Conf->AffixData[StopMiddle->affix], affixflag) != NULL))
                        return 1;
                }
                node = StopMiddle->node;
                ptr++;
                break;
            }
            else if (StopMiddle->val < *ptr)
                StopLow = StopMiddle + 1;
            else
                StopHigh = StopMiddle;
        }
        if (StopLow >= StopHigh)
            break;
    }
    return 0;
}

static void
NIAddAffix(IspellDict *Conf, int flag, char flagflags, const char *mask, const char *find, const char *repl, int type)
{
    AFFIX      *Affix;

    if (Conf->naffixes >= Conf->maffixes)
    {
        if (Conf->maffixes)
        {
            Conf->maffixes *= 2;
            Conf->Affix = (AFFIX *) repalloc((void *) Conf->Affix, Conf->maffixes * sizeof(AFFIX));
        }
        else
        {
            Conf->maffixes = 16;
            Conf->Affix = (AFFIX *) palloc(Conf->maffixes * sizeof(AFFIX));
        }
    }

    Affix = Conf->Affix + Conf->naffixes;

    if (strcmp(mask, ".") == 0)
    {
        Affix->issimple = 1;
        Affix->isregis = 0;
    }
    else if (RS_isRegis(mask))
    {
        Affix->issimple = 0;
        Affix->isregis = 1;
        RS_compile(&(Affix->reg.regis), (type == FF_SUFFIX) ? true : false,
                   (mask && *mask) ? mask : VoidString);
    }
    else
    {
        int         masklen;
        int         wmasklen;
        int         err;
        pg_wchar   *wmask;
        char       *tmask;

        Affix->issimple = 0;
        Affix->isregis = 0;
        tmask = (char *) tmpalloc(strlen(mask) + 3);
        if (type == FF_SUFFIX)
            sprintf(tmask, "%s$", mask);
        else
            sprintf(tmask, "^%s", mask);

        masklen = strlen(tmask);
        wmask = (pg_wchar *) tmpalloc((masklen + 1) * sizeof(pg_wchar));
        wmasklen = pg_mb2wchar_with_len(tmask, wmask, masklen);

        err = pg_regcomp(&(Affix->reg.regex), wmask, wmasklen,
                         REG_ADVANCED | REG_NOSUB,
                         DEFAULT_COLLATION_OID);
        if (err)
        {
            char        errstr[100];

            pg_regerror(err, &(Affix->reg.regex), errstr, sizeof(errstr));
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
                     errmsg("invalid regular expression: %s", errstr)));
        }
    }

    Affix->flagflags = flagflags;
    if ((Affix->flagflags & FF_COMPOUNDONLY) || (Affix->flagflags & FF_COMPOUNDPERMITFLAG))
    {
        if ((Affix->flagflags & FF_COMPOUNDFLAG) == 0)
            Affix->flagflags |= FF_COMPOUNDFLAG;
    }
    Affix->flag = flag;
    Affix->type = type;

    Affix->find = (find && *find) ? cpstrdup(Conf, find) : VoidString;
    if ((Affix->replen = strlen(repl)) > 0)
        Affix->repl = cpstrdup(Conf, repl);
    else
        Affix->repl = VoidString;
    Conf->naffixes++;
}

#define PAE_WAIT_MASK   0
#define PAE_INMASK  1
#define PAE_WAIT_FIND   2
#define PAE_INFIND  3
#define PAE_WAIT_REPL   4
#define PAE_INREPL  5

static bool
parse_affentry(char *str, char *mask, char *find, char *repl)
{
    int         state = PAE_WAIT_MASK;
    char       *pmask = mask,
               *pfind = find,
               *prepl = repl;

    *mask = *find = *repl = '\0';

    while (*str)
    {
        if (state == PAE_WAIT_MASK)
        {
            if (t_iseq(str, '#'))
                return false;
            else if (!t_isspace(str))
            {
                COPYCHAR(pmask, str);
                pmask += pg_mblen(str);
                state = PAE_INMASK;
            }
        }
        else if (state == PAE_INMASK)
        {
            if (t_iseq(str, '>'))
            {
                *pmask = '\0';
                state = PAE_WAIT_FIND;
            }
            else if (!t_isspace(str))
            {
                COPYCHAR(pmask, str);
                pmask += pg_mblen(str);
            }
        }
        else if (state == PAE_WAIT_FIND)
        {
            if (t_iseq(str, '-'))
            {
                state = PAE_INFIND;
            }
            else if (t_isalpha(str) || t_iseq(str, '\'') /* english 's */ )
            {
                COPYCHAR(prepl, str);
                prepl += pg_mblen(str);
                state = PAE_INREPL;
            }
            else if (!t_isspace(str))
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("syntax error")));
        }
        else if (state == PAE_INFIND)
        {
            if (t_iseq(str, ','))
            {
                *pfind = '\0';
                state = PAE_WAIT_REPL;
            }
            else if (t_isalpha(str))
            {
                COPYCHAR(pfind, str);
                pfind += pg_mblen(str);
            }
            else if (!t_isspace(str))
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("syntax error")));
        }
        else if (state == PAE_WAIT_REPL)
        {
            if (t_iseq(str, '-'))
            {
                break;          /* void repl */
            }
            else if (t_isalpha(str))
            {
                COPYCHAR(prepl, str);
                prepl += pg_mblen(str);
                state = PAE_INREPL;
            }
            else if (!t_isspace(str))
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("syntax error")));
        }
        else if (state == PAE_INREPL)
        {
            if (t_iseq(str, '#'))
            {
                *prepl = '\0';
                break;
            }
            else if (t_isalpha(str))
            {
                COPYCHAR(prepl, str);
                prepl += pg_mblen(str);
            }
            else if (!t_isspace(str))
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("syntax error")));
        }
        else
            elog(ERROR, "unrecognized state in parse_affentry: %d", state);

        str += pg_mblen(str);
    }

    *pmask = *pfind = *prepl = '\0';

    return (*mask && (*find || *repl)) ? true : false;
}

static void
addFlagValue(IspellDict *Conf, char *s, uint32 val)
{
    while (*s && t_isspace(s))
        s += pg_mblen(s);

    if (!*s)
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("syntax error")));

    if (pg_mblen(s) != 1)
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("multibyte flag character is not allowed")));

    Conf->flagval[*(unsigned char *) s] = (unsigned char) val;
    Conf->usecompound = true;
}

static void
NIImportOOAffixes(IspellDict *Conf, const char *filename)
{
    char        type[BUFSIZ],
               *ptype = NULL;
    char        sflag[BUFSIZ];
    char        mask[BUFSIZ],
               *pmask;
    char        find[BUFSIZ],
               *pfind;
    char        repl[BUFSIZ],
               *prepl;
    bool        isSuffix = false;
    int         flag = 0;
    char        flagflags = 0;
    tsearch_readline_state trst;
    int         scanread = 0;
    char        scanbuf[BUFSIZ];
    char       *recoded;

    /* read file to find any flag */
    memset(Conf->flagval, 0, sizeof(Conf->flagval));
    Conf->usecompound = false;

    if (!tsearch_readline_begin(&trst, filename))
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("could not open affix file \"%s\": %m",
                        filename)));

    while ((recoded = tsearch_readline(&trst)) != NULL)
    {
        if (*recoded == '\0' || t_isspace(recoded) || t_iseq(recoded, '#'))
        {
            pfree(recoded);
            continue;
        }

        if (STRNCMP(recoded, "COMPOUNDFLAG") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDFLAG"),
                         FF_COMPOUNDFLAG);
        else if (STRNCMP(recoded, "COMPOUNDBEGIN") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDBEGIN"),
                         FF_COMPOUNDBEGIN);
        else if (STRNCMP(recoded, "COMPOUNDLAST") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDLAST"),
                         FF_COMPOUNDLAST);
        /* COMPOUNDLAST and COMPOUNDEND are synonyms */
        else if (STRNCMP(recoded, "COMPOUNDEND") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDEND"),
                         FF_COMPOUNDLAST);
        else if (STRNCMP(recoded, "COMPOUNDMIDDLE") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDMIDDLE"),
                         FF_COMPOUNDMIDDLE);
        else if (STRNCMP(recoded, "ONLYINCOMPOUND") == 0)
            addFlagValue(Conf, recoded + strlen("ONLYINCOMPOUND"),
                         FF_COMPOUNDONLY);
        else if (STRNCMP(recoded, "COMPOUNDPERMITFLAG") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDPERMITFLAG"),
                         FF_COMPOUNDPERMITFLAG);
        else if (STRNCMP(recoded, "COMPOUNDFORBIDFLAG") == 0)
            addFlagValue(Conf, recoded + strlen("COMPOUNDFORBIDFLAG"),
                         FF_COMPOUNDFORBIDFLAG);
        else if (STRNCMP(recoded, "FLAG") == 0)
        {
            char       *s = recoded + strlen("FLAG");

            while (*s && t_isspace(s))
                s += pg_mblen(s);

            if (*s && STRNCMP(s, "default") != 0)
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("Ispell dictionary supports only default flag value")));
        }

        pfree(recoded);
    }
    tsearch_readline_end(&trst);

    sprintf(scanbuf, "%%6s %%%ds %%%ds %%%ds %%%ds", BUFSIZ / 5, BUFSIZ / 5, BUFSIZ / 5, BUFSIZ / 5);

    if (!tsearch_readline_begin(&trst, filename))
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("could not open affix file \"%s\": %m",
                        filename)));

    while ((recoded = tsearch_readline(&trst)) != NULL)
    {
        if (*recoded == '\0' || t_isspace(recoded) || t_iseq(recoded, '#'))
            goto nextline;

        scanread = sscanf(recoded, scanbuf, type, sflag, find, repl, mask);

        if (ptype)
            pfree(ptype);
        ptype = lowerstr_ctx(Conf, type);
        if (scanread < 4 || (STRNCMP(ptype, "sfx") && STRNCMP(ptype, "pfx")))
            goto nextline;

        if (scanread == 4)
        {
            if (strlen(sflag) != 1)
                goto nextline;
            flag = *sflag;
            isSuffix = (STRNCMP(ptype, "sfx") == 0) ? true : false;
            if (t_iseq(find, 'y') || t_iseq(find, 'Y'))
                flagflags = FF_CROSSPRODUCT;
            else
                flagflags = 0;
        }
        else
        {
            char       *ptr;
            int         aflg = 0;

            if (strlen(sflag) != 1 || flag != *sflag || flag == 0)
                goto nextline;
            prepl = lowerstr_ctx(Conf, repl);
            /* affix flag */
            if ((ptr = strchr(prepl, '/')) != NULL)
            {
                *ptr = '\0';
                ptr = repl + (ptr - prepl) + 1;
                while (*ptr)
                {
                    aflg |= Conf->flagval[*(unsigned char *) ptr];
                    ptr++;
                }
            }
            pfind = lowerstr_ctx(Conf, find);
            pmask = lowerstr_ctx(Conf, mask);
            if (t_iseq(find, '0'))
                *pfind = '\0';
            if (t_iseq(repl, '0'))
                *prepl = '\0';

            NIAddAffix(Conf, flag, flagflags | aflg, pmask, pfind, prepl,
                       isSuffix ? FF_SUFFIX : FF_PREFIX);
            pfree(prepl);
            pfree(pfind);
            pfree(pmask);
        }

nextline:
        pfree(recoded);
    }

    tsearch_readline_end(&trst);
    if (ptype)
        pfree(ptype);
}

/*
 * import affixes
 *
 * Note caller must already have applied get_tsearch_config_filename
 */
void
NIImportAffixes(IspellDict *Conf, const char *filename)
{
    char       *pstr = NULL;
    char        mask[BUFSIZ];
    char        find[BUFSIZ];
    char        repl[BUFSIZ];
    char       *s;
    bool        suffixes = false;
    bool        prefixes = false;
    int         flag = 0;
    char        flagflags = 0;
    tsearch_readline_state trst;
    bool        oldformat = false;
    char       *recoded = NULL;

    if (!tsearch_readline_begin(&trst, filename))
        ereport(ERROR,
                (errcode(ERRCODE_CONFIG_FILE_ERROR),
                 errmsg("could not open affix file \"%s\": %m",
                        filename)));

    memset(Conf->flagval, 0, sizeof(Conf->flagval));
    Conf->usecompound = false;

    while ((recoded = tsearch_readline(&trst)) != NULL)
    {
        pstr = lowerstr(recoded);

        /* Skip comments and empty lines */
        if (*pstr == '#' || *pstr == '\n')
            goto nextline;

        if (STRNCMP(pstr, "compoundwords") == 0)
        {
            s = findchar(pstr, 'l');
            if (s)
            {
                s = recoded + (s - pstr);       /* we need non-lowercased
                                                 * string */
                while (*s && !t_isspace(s))
                    s += pg_mblen(s);
                while (*s && t_isspace(s))
                    s += pg_mblen(s);

                if (*s && pg_mblen(s) == 1)
                {
                    Conf->flagval[*(unsigned char *) s] = FF_COMPOUNDFLAG;
                    Conf->usecompound = true;
                }
                oldformat = true;
                goto nextline;
            }
        }
        if (STRNCMP(pstr, "suffixes") == 0)
        {
            suffixes = true;
            prefixes = false;
            oldformat = true;
            goto nextline;
        }
        if (STRNCMP(pstr, "prefixes") == 0)
        {
            suffixes = false;
            prefixes = true;
            oldformat = true;
            goto nextline;
        }
        if (STRNCMP(pstr, "flag") == 0)
        {
            s = recoded + 4;    /* we need non-lowercased string */
            flagflags = 0;

            while (*s && t_isspace(s))
                s += pg_mblen(s);
            oldformat = true;

            /* allow only single-encoded flags */
            if (pg_mblen(s) != 1)
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("multibyte flag character is not allowed")));

            if (*s == '*')
            {
                flagflags |= FF_CROSSPRODUCT;
                s++;
            }
            else if (*s == '~')
            {
                flagflags |= FF_COMPOUNDONLY;
                s++;
            }

            if (*s == '\\')
                s++;

            /* allow only single-encoded flags */
            if (pg_mblen(s) != 1)
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("multibyte flag character is not allowed")));

            flag = *(unsigned char *) s;
            goto nextline;
        }
        if (STRNCMP(recoded, "COMPOUNDFLAG") == 0 || STRNCMP(recoded, "COMPOUNDMIN") == 0 ||
            STRNCMP(recoded, "PFX") == 0 || STRNCMP(recoded, "SFX") == 0)
        {
            if (oldformat)
                ereport(ERROR,
                        (errcode(ERRCODE_CONFIG_FILE_ERROR),
                         errmsg("wrong affix file format for flag")));
            tsearch_readline_end(&trst);
            NIImportOOAffixes(Conf, filename);
            return;
        }
        if ((!suffixes) && (!prefixes))
            goto nextline;

        if (!parse_affentry(pstr, mask, find, repl))
            goto nextline;

        NIAddAffix(Conf, flag, flagflags, mask, find, repl, suffixes ? FF_SUFFIX : FF_PREFIX);

nextline:
        pfree(recoded);
        pfree(pstr);
    }
    tsearch_readline_end(&trst);
}

static int
MergeAffix(IspellDict *Conf, int a1, int a2)
{
    char      **ptr;

    while (Conf->nAffixData + 1 >= Conf->lenAffixData)
    {
        Conf->lenAffixData *= 2;
        Conf->AffixData = (char **) repalloc(Conf->AffixData,
                                        sizeof(char *) * Conf->lenAffixData);
    }

    ptr = Conf->AffixData + Conf->nAffixData;
    *ptr = cpalloc(strlen(Conf->AffixData[a1]) +
                   strlen(Conf->AffixData[a2]) +
                   1 /* space */ + 1 /* \0 */ );
    sprintf(*ptr, "%s %s", Conf->AffixData[a1], Conf->AffixData[a2]);
    ptr++;
    *ptr = NULL;
    Conf->nAffixData++;

    return Conf->nAffixData - 1;
}

static uint32
makeCompoundFlags(IspellDict *Conf, int affix)
{
    uint32      flag = 0;
    char       *str = Conf->AffixData[affix];

    while (str && *str)
    {
        flag |= Conf->flagval[*(unsigned char *) str];
        str++;
    }

    return (flag & FF_DICTFLAGMASK);
}

static SPNode *
mkSPNode(IspellDict *Conf, int low, int high, int level)
{
    int         i;
    int         nchar = 0;
    char        lastchar = '\0';
    SPNode     *rs;
    SPNodeData *data;
    int         lownew = low;

    for (i = low; i < high; i++)
        if (Conf->Spell[i]->p.d.len > level && lastchar != Conf->Spell[i]->word[level])
        {
            nchar++;
            lastchar = Conf->Spell[i]->word[level];
        }

    if (!nchar)
        return NULL;

    rs = (SPNode *) cpalloc0(SPNHDRSZ + nchar * sizeof(SPNodeData));
    rs->length = nchar;
    data = rs->data;

    lastchar = '\0';
    for (i = low; i < high; i++)
        if (Conf->Spell[i]->p.d.len > level)
        {
            if (lastchar != Conf->Spell[i]->word[level])
            {
                if (lastchar)
                {
                    data->node = mkSPNode(Conf, lownew, i, level + 1);
                    lownew = i;
                    data++;
                }
                lastchar = Conf->Spell[i]->word[level];
            }
            data->val = ((uint8 *) (Conf->Spell[i]->word))[level];
            if (Conf->Spell[i]->p.d.len == level + 1)
            {
                bool        clearCompoundOnly = false;

                if (data->isword && data->affix != Conf->Spell[i]->p.d.affix)
                {
                    /*
                     * MergeAffix called a few times. If one of word is
                     * allowed to be in compound word and another isn't, then
                     * clear FF_COMPOUNDONLY flag.
                     */

                    clearCompoundOnly = (FF_COMPOUNDONLY & data->compoundflag
                        & makeCompoundFlags(Conf, Conf->Spell[i]->p.d.affix))
                        ? false : true;
                    data->affix = MergeAffix(Conf, data->affix, Conf->Spell[i]->p.d.affix);
                }
                else
                    data->affix = Conf->Spell[i]->p.d.affix;
                data->isword = 1;

                data->compoundflag = makeCompoundFlags(Conf, data->affix);

                if ((data->compoundflag & FF_COMPOUNDONLY) &&
                    (data->compoundflag & FF_COMPOUNDFLAG) == 0)
                    data->compoundflag |= FF_COMPOUNDFLAG;

                if (clearCompoundOnly)
                    data->compoundflag &= ~FF_COMPOUNDONLY;
            }
        }

    data->node = mkSPNode(Conf, lownew, high, level + 1);

    return rs;
}

/*
 * Builds the Conf->Dictionary tree and AffixData from the imported dictionary
 * and affixes.
 */
void
NISortDictionary(IspellDict *Conf)
{
    int         i;
    int         naffix = 0;
    int         curaffix;

    /* compress affixes */

    /* Count the number of different flags used in the dictionary */

    qsort((void *) Conf->Spell, Conf->nspell, sizeof(SPELL *), cmpspellaffix);

    naffix = 0;
    for (i = 0; i < Conf->nspell; i++)
    {
        if (i == 0 || strncmp(Conf->Spell[i]->p.flag, Conf->Spell[i - 1]->p.flag, MAXFLAGLEN))
            naffix++;
    }

    /*
     * Fill in Conf->AffixData with the affixes that were used in the
     * dictionary. Replace textual flag-field of Conf->Spell entries with
     * indexes into Conf->AffixData array.
     */
    Conf->AffixData = (char **) palloc0(naffix * sizeof(char *));

    curaffix = -1;
    for (i = 0; i < Conf->nspell; i++)
    {
        if (i == 0 || strncmp(Conf->Spell[i]->p.flag, Conf->AffixData[curaffix], MAXFLAGLEN))
        {
            curaffix++;
            Assert(curaffix < naffix);
            Conf->AffixData[curaffix] = cpstrdup(Conf, Conf->Spell[i]->p.flag);
        }

        Conf->Spell[i]->p.d.affix = curaffix;
        Conf->Spell[i]->p.d.len = strlen(Conf->Spell[i]->word);
    }

    Conf->lenAffixData = Conf->nAffixData = naffix;

    qsort((void *) Conf->Spell, Conf->nspell, sizeof(SPELL *), cmpspell);
    Conf->Dictionary = mkSPNode(Conf, 0, Conf->nspell, 0);
}

static AffixNode *
mkANode(IspellDict *Conf, int low, int high, int level, int type)
{
    int         i;
    int         nchar = 0;
    uint8       lastchar = '\0';
    AffixNode  *rs;
    AffixNodeData *data;
    int         lownew = low;
    int         naff;
    AFFIX     **aff;

    for (i = low; i < high; i++)
        if (Conf->Affix[i].replen > level && lastchar != GETCHAR(Conf->Affix + i, level, type))
        {
            nchar++;
            lastchar = GETCHAR(Conf->Affix + i, level, type);
        }

    if (!nchar)
        return NULL;

    aff = (AFFIX **) tmpalloc(sizeof(AFFIX *) * (high - low + 1));
    naff = 0;

    rs = (AffixNode *) cpalloc0(ANHRDSZ + nchar * sizeof(AffixNodeData));
    rs->length = nchar;
    data = rs->data;

    lastchar = '\0';
    for (i = low; i < high; i++)
        if (Conf->Affix[i].replen > level)
        {
            if (lastchar != GETCHAR(Conf->Affix + i, level, type))
            {
                if (lastchar)
                {
                    data->node = mkANode(Conf, lownew, i, level + 1, type);
                    if (naff)
                    {
                        data->naff = naff;
                        data->aff = (AFFIX **) cpalloc(sizeof(AFFIX *) * naff);
                        memcpy(data->aff, aff, sizeof(AFFIX *) * naff);
                        naff = 0;
                    }
                    data++;
                    lownew = i;
                }
                lastchar = GETCHAR(Conf->Affix + i, level, type);
            }
            data->val = GETCHAR(Conf->Affix + i, level, type);
            if (Conf->Affix[i].replen == level + 1)
            {                   /* affix stopped */
                aff[naff++] = Conf->Affix + i;
            }
        }

    data->node = mkANode(Conf, lownew, high, level + 1, type);
    if (naff)
    {
        data->naff = naff;
        data->aff = (AFFIX **) cpalloc(sizeof(AFFIX *) * naff);
        memcpy(data->aff, aff, sizeof(AFFIX *) * naff);
        naff = 0;
    }

    pfree(aff);

    return rs;
}

static void
mkVoidAffix(IspellDict *Conf, bool issuffix, int startsuffix)
{
    int         i,
                cnt = 0;
    int         start = (issuffix) ? startsuffix : 0;
    int         end = (issuffix) ? Conf->naffixes : startsuffix;
    AffixNode  *Affix = (AffixNode *) palloc0(ANHRDSZ + sizeof(AffixNodeData));

    Affix->length = 1;
    Affix->isvoid = 1;

    if (issuffix)
    {
        Affix->data->node = Conf->Suffix;
        Conf->Suffix = Affix;
    }
    else
    {
        Affix->data->node = Conf->Prefix;
        Conf->Prefix = Affix;
    }


    for (i = start; i < end; i++)
        if (Conf->Affix[i].replen == 0)
            cnt++;

    if (cnt == 0)
        return;

    Affix->data->aff = (AFFIX **) cpalloc(sizeof(AFFIX *) * cnt);
    Affix->data->naff = (uint32) cnt;

    cnt = 0;
    for (i = start; i < end; i++)
        if (Conf->Affix[i].replen == 0)
        {
            Affix->data->aff[cnt] = Conf->Affix + i;
            cnt++;
        }
}

static bool
isAffixInUse(IspellDict *Conf, char flag)
{
    int         i;

    for (i = 0; i < Conf->nAffixData; i++)
        if (strchr(Conf->AffixData[i], flag) != NULL)
            return true;

    return false;
}

void
NISortAffixes(IspellDict *Conf)
{
    AFFIX      *Affix;
    size_t      i;
    CMPDAffix  *ptr;
    int         firstsuffix = Conf->naffixes;

    if (Conf->naffixes == 0)
        return;

    if (Conf->naffixes > 1)
        qsort((void *) Conf->Affix, Conf->naffixes, sizeof(AFFIX), cmpaffix);
    Conf->CompoundAffix = ptr = (CMPDAffix *) palloc(sizeof(CMPDAffix) * Conf->naffixes);
    ptr->affix = NULL;

    for (i = 0; i < Conf->naffixes; i++)
    {
        Affix = &(((AFFIX *) Conf->Affix)[i]);
        if (Affix->type == FF_SUFFIX && i < firstsuffix)
            firstsuffix = i;

        if ((Affix->flagflags & FF_COMPOUNDFLAG) && Affix->replen > 0 &&
            isAffixInUse(Conf, (char) Affix->flag))
        {
            if (ptr == Conf->CompoundAffix ||
                ptr->issuffix != (ptr - 1)->issuffix ||
                strbncmp((const unsigned char *) (ptr - 1)->affix,
                         (const unsigned char *) Affix->repl,
                         (ptr - 1)->len))
            {
                /* leave only unique and minimals suffixes */
                ptr->affix = Affix->repl;
                ptr->len = Affix->replen;
                ptr->issuffix = (Affix->type == FF_SUFFIX) ? true : false;
                ptr++;
            }
        }
    }
    ptr->affix = NULL;
    Conf->CompoundAffix = (CMPDAffix *) repalloc(Conf->CompoundAffix, sizeof(CMPDAffix) * (ptr - Conf->CompoundAffix + 1));

    Conf->Prefix = mkANode(Conf, 0, firstsuffix, 0, FF_PREFIX);
    Conf->Suffix = mkANode(Conf, firstsuffix, Conf->naffixes, 0, FF_SUFFIX);
    mkVoidAffix(Conf, true, firstsuffix);
    mkVoidAffix(Conf, false, firstsuffix);
}

static AffixNodeData *
FindAffixes(AffixNode *node, const char *word, int wrdlen, int *level, int type)
{
    AffixNodeData *StopLow,
               *StopHigh,
               *StopMiddle;
    uint8 symbol;

    if (node->isvoid)
    {                           /* search void affixes */
        if (node->data->naff)
            return node->data;
        node = node->data->node;
    }

    while (node && *level < wrdlen)
    {
        StopLow = node->data;
        StopHigh = node->data + node->length;
        while (StopLow < StopHigh)
        {
            StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
            symbol = GETWCHAR(word, wrdlen, *level, type);

            if (StopMiddle->val == symbol)
            {
                (*level)++;
                if (StopMiddle->naff)
                    return StopMiddle;
                node = StopMiddle->node;
                break;
            }
            else if (StopMiddle->val < symbol)
                StopLow = StopMiddle + 1;
            else
                StopHigh = StopMiddle;
        }
        if (StopLow >= StopHigh)
            break;
    }
    return NULL;
}

static char *
CheckAffix(const char *word, size_t len, AFFIX *Affix, int flagflags, char *newword, int *baselen)
{
    /*
     * Check compound allow flags
     */

    if (flagflags == 0)
    {
        if (Affix->flagflags & FF_COMPOUNDONLY)
            return NULL;
    }
    else if (flagflags & FF_COMPOUNDBEGIN)
    {
        if (Affix->flagflags & FF_COMPOUNDFORBIDFLAG)
            return NULL;
        if ((Affix->flagflags & FF_COMPOUNDBEGIN) == 0)
            if (Affix->type == FF_SUFFIX)
                return NULL;
    }
    else if (flagflags & FF_COMPOUNDMIDDLE)
    {
        if ((Affix->flagflags & FF_COMPOUNDMIDDLE) == 0 ||
            (Affix->flagflags & FF_COMPOUNDFORBIDFLAG))
            return NULL;
    }
    else if (flagflags & FF_COMPOUNDLAST)
    {
        if (Affix->flagflags & FF_COMPOUNDFORBIDFLAG)
            return NULL;
        if ((Affix->flagflags & FF_COMPOUNDLAST) == 0)
            if (Affix->type == FF_PREFIX)
                return NULL;
    }

    /*
     * make replace pattern of affix
     */
    if (Affix->type == FF_SUFFIX)
    {
        strcpy(newword, word);
        strcpy(newword + len - Affix->replen, Affix->find);
        if (baselen)            /* store length of non-changed part of word */
            *baselen = len - Affix->replen;
    }
    else
    {
        /*
         * if prefix is a all non-chaged part's length then all word contains
         * only prefix and suffix, so out
         */
        if (baselen && *baselen + strlen(Affix->find) <= Affix->replen)
            return NULL;
        strcpy(newword, Affix->find);
        strcat(newword, word + Affix->replen);
    }

    /*
     * check resulting word
     */
    if (Affix->issimple)
        return newword;
    else if (Affix->isregis)
    {
        if (RS_execute(&(Affix->reg.regis), newword))
            return newword;
    }
    else
    {
        int         err;
        pg_wchar   *data;
        size_t      data_len;
        int         newword_len;

        /* Convert data string to wide characters */
        newword_len = strlen(newword);
        data = (pg_wchar *) palloc((newword_len + 1) * sizeof(pg_wchar));
        data_len = pg_mb2wchar_with_len(newword, data, newword_len);

        if (!(err = pg_regexec(&(Affix->reg.regex), data, data_len, 0, NULL, 0, NULL, 0)))
        {
            pfree(data);
            return newword;
        }
        pfree(data);
    }

    return NULL;
}

static int
addToResult(char **forms, char **cur, char *word)
{
    if (cur - forms >= MAX_NORM - 1)
        return 0;
    if (forms == cur || strcmp(word, *(cur - 1)) != 0)
    {
        *cur = pstrdup(word);
        *(cur + 1) = NULL;
        return 1;
    }

    return 0;
}

static char **
NormalizeSubWord(IspellDict *Conf, char *word, int flag)
{
    AffixNodeData *suffix = NULL,
               *prefix = NULL;
    int         slevel = 0,
                plevel = 0;
    int         wrdlen = strlen(word),
                swrdlen;
    char      **forms;
    char      **cur;
    char        newword[2 * MAXNORMLEN] = "";
    char        pnewword[2 * MAXNORMLEN] = "";
    AffixNode  *snode = Conf->Suffix,
               *pnode;
    int         i,
                j;

    if (wrdlen > MAXNORMLEN)
        return NULL;
    cur = forms = (char **) palloc(MAX_NORM * sizeof(char *));
    *cur = NULL;


    /* Check that the word itself is normal form */
    if (FindWord(Conf, word, 0, flag))
    {
        *cur = pstrdup(word);
        cur++;
        *cur = NULL;
    }

    /* Find all other NORMAL forms of the 'word' (check only prefix) */
    pnode = Conf->Prefix;
    plevel = 0;
    while (pnode)
    {
        prefix = FindAffixes(pnode, word, wrdlen, &plevel, FF_PREFIX);
        if (!prefix)
            break;
        for (j = 0; j < prefix->naff; j++)
        {
            if (CheckAffix(word, wrdlen, prefix->aff[j], flag, newword, NULL))
            {
                /* prefix success */
                if (FindWord(Conf, newword, prefix->aff[j]->flag, flag))
                    cur += addToResult(forms, cur, newword);
            }
        }
        pnode = prefix->node;
    }

    /*
     * Find all other NORMAL forms of the 'word' (check suffix and then
     * prefix)
     */
    while (snode)
    {
        int         baselen = 0;

        /* find possible suffix */
        suffix = FindAffixes(snode, word, wrdlen, &slevel, FF_SUFFIX);
        if (!suffix)
            break;
        /* foreach suffix check affix */
        for (i = 0; i < suffix->naff; i++)
        {
            if (CheckAffix(word, wrdlen, suffix->aff[i], flag, newword, &baselen))
            {
                /* suffix success */
                if (FindWord(Conf, newword, suffix->aff[i]->flag, flag))
                    cur += addToResult(forms, cur, newword);

                /* now we will look changed word with prefixes */
                pnode = Conf->Prefix;
                plevel = 0;
                swrdlen = strlen(newword);
                while (pnode)
                {
                    prefix = FindAffixes(pnode, newword, swrdlen, &plevel, FF_PREFIX);
                    if (!prefix)
                        break;
                    for (j = 0; j < prefix->naff; j++)
                    {
                        if (CheckAffix(newword, swrdlen, prefix->aff[j], flag, pnewword, &baselen))
                        {
                            /* prefix success */
                            int         ff = (prefix->aff[j]->flagflags & suffix->aff[i]->flagflags & FF_CROSSPRODUCT) ?
                            0 : prefix->aff[j]->flag;

                            if (FindWord(Conf, pnewword, ff, flag))
                                cur += addToResult(forms, cur, pnewword);
                        }
                    }
                    pnode = prefix->node;
                }
            }
        }

        snode = suffix->node;
    }

    if (cur == forms)
    {
        pfree(forms);
        return (NULL);
    }
    return (forms);
}

typedef struct SplitVar
{
    int         nstem;
    int         lenstem;
    char      **stem;
    struct SplitVar *next;
} SplitVar;

static int
CheckCompoundAffixes(CMPDAffix **ptr, char *word, int len, bool CheckInPlace)
{
    bool        issuffix;

    if (CheckInPlace)
    {
        while ((*ptr)->affix)
        {
            if (len > (*ptr)->len && strncmp((*ptr)->affix, word, (*ptr)->len) == 0)
            {
                len = (*ptr)->len;
                issuffix = (*ptr)->issuffix;
                (*ptr)++;
                return (issuffix) ? len : 0;
            }
            (*ptr)++;
        }
    }
    else
    {
        char       *affbegin;

        while ((*ptr)->affix)
        {
            if (len > (*ptr)->len && (affbegin = strstr(word, (*ptr)->affix)) != NULL)
            {
                len = (*ptr)->len + (affbegin - word);
                issuffix = (*ptr)->issuffix;
                (*ptr)++;
                return (issuffix) ? len : 0;
            }
            (*ptr)++;
        }
    }
    return -1;
}

static SplitVar *
CopyVar(SplitVar *s, int makedup)
{
    SplitVar   *v = (SplitVar *) palloc(sizeof(SplitVar));

    v->next = NULL;
    if (s)
    {
        int         i;

        v->lenstem = s->lenstem;
        v->stem = (char **) palloc(sizeof(char *) * v->lenstem);
        v->nstem = s->nstem;
        for (i = 0; i < s->nstem; i++)
            v->stem[i] = (makedup) ? pstrdup(s->stem[i]) : s->stem[i];
    }
    else
    {
        v->lenstem = 16;
        v->stem = (char **) palloc(sizeof(char *) * v->lenstem);
        v->nstem = 0;
    }
    return v;
}

static void
AddStem(SplitVar *v, char *word)
{
    if (v->nstem >= v->lenstem)
    {
        v->lenstem *= 2;
        v->stem = (char **) repalloc(v->stem, sizeof(char *) * v->lenstem);
    }

    v->stem[v->nstem] = word;
    v->nstem++;
}

static SplitVar *
SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int wordlen, int startpos, int minpos)
{
    SplitVar   *var = NULL;
    SPNodeData *StopLow,
               *StopHigh,
               *StopMiddle = NULL;
    SPNode     *node = (snode) ? snode : Conf->Dictionary;
    int         level = (snode) ? minpos : startpos;    /* recursive
                                                         * minpos==level */
    int         lenaff;
    CMPDAffix  *caff;
    char       *notprobed;
    int         compoundflag = 0;

    notprobed = (char *) palloc(wordlen);
    memset(notprobed, 1, wordlen);
    var = CopyVar(orig, 1);

    while (level < wordlen)
    {
        /* find word with epenthetic or/and compound affix */
        caff = Conf->CompoundAffix;
        while (level > startpos && (lenaff = CheckCompoundAffixes(&caff, word + level, wordlen - level, (node) ? true : false)) >= 0)
        {
            /*
             * there is one of compound affixes, so check word for existings
             */
            char        buf[MAXNORMLEN];
            char      **subres;

            lenaff = level - startpos + lenaff;

            if (!notprobed[startpos + lenaff - 1])
                continue;

            if (level + lenaff - 1 <= minpos)
                continue;

            if (lenaff >= MAXNORMLEN)
                continue;       /* skip too big value */
            if (lenaff > 0)
                memcpy(buf, word + startpos, lenaff);
            buf[lenaff] = '\0';

            if (level == 0)
                compoundflag = FF_COMPOUNDBEGIN;
            else if (level == wordlen - 1)
                compoundflag = FF_COMPOUNDLAST;
            else
                compoundflag = FF_COMPOUNDMIDDLE;
            subres = NormalizeSubWord(Conf, buf, compoundflag);
            if (subres)
            {
                /* Yes, it was a word from dictionary */
                SplitVar   *new = CopyVar(var, 0);
                SplitVar   *ptr = var;
                char      **sptr = subres;

                notprobed[startpos + lenaff - 1] = 0;

                while (*sptr)
                {
                    AddStem(new, *sptr);
                    sptr++;
                }
                pfree(subres);

                while (ptr->next)
                    ptr = ptr->next;
                ptr->next = SplitToVariants(Conf, NULL, new, word, wordlen, startpos + lenaff, startpos + lenaff);

                pfree(new->stem);
                pfree(new);
            }
        }

        if (!node)
            break;

        StopLow = node->data;
        StopHigh = node->data + node->length;
        while (StopLow < StopHigh)
        {
            StopMiddle = StopLow + ((StopHigh - StopLow) >> 1);
            if (StopMiddle->val == ((uint8 *) (word))[level])
                break;
            else if (StopMiddle->val < ((uint8 *) (word))[level])
                StopLow = StopMiddle + 1;
            else
                StopHigh = StopMiddle;
        }

        if (StopLow < StopHigh)
        {
            if (level == FF_COMPOUNDBEGIN)
                compoundflag = FF_COMPOUNDBEGIN;
            else if (level == wordlen - 1)
                compoundflag = FF_COMPOUNDLAST;
            else
                compoundflag = FF_COMPOUNDMIDDLE;

            /* find infinitive */
            if (StopMiddle->isword &&
                (StopMiddle->compoundflag & compoundflag) &&
                notprobed[level])
            {
                /* ok, we found full compoundallowed word */
                if (level > minpos)
                {
                    /* and its length more than minimal */
                    if (wordlen == level + 1)
                    {
                        /* well, it was last word */
                        AddStem(var, pnstrdup(word + startpos, wordlen - startpos));
                        pfree(notprobed);
                        return var;
                    }
                    else
                    {
                        /* then we will search more big word at the same point */
                        SplitVar   *ptr = var;

                        while (ptr->next)
                            ptr = ptr->next;
                        ptr->next = SplitToVariants(Conf, node, var, word, wordlen, startpos, level);
                        /* we can find next word */
                        level++;
                        AddStem(var, pnstrdup(word + startpos, level - startpos));
                        node = Conf->Dictionary;
                        startpos = level;
                        continue;
                    }
                }
            }
            node = StopMiddle->node;
        }
        else
            node = NULL;
        level++;
    }

    AddStem(var, pnstrdup(word + startpos, wordlen - startpos));
    pfree(notprobed);
    return var;
}

static void
addNorm(TSLexeme **lres, TSLexeme **lcur, char *word, int flags, uint16 NVariant)
{
    if (*lres == NULL)
        *lcur = *lres = (TSLexeme *) palloc(MAX_NORM * sizeof(TSLexeme));

    if (*lcur - *lres < MAX_NORM - 1)
    {
        (*lcur)->lexeme = word;
        (*lcur)->flags = flags;
        (*lcur)->nvariant = NVariant;
        (*lcur)++;
        (*lcur)->lexeme = NULL;
    }
}

TSLexeme *
NINormalizeWord(IspellDict *Conf, char *word)
{
    char      **res;
    TSLexeme   *lcur = NULL,
               *lres = NULL;
    uint16      NVariant = 1;

    res = NormalizeSubWord(Conf, word, 0);

    if (res)
    {
        char      **ptr = res;

        while (*ptr && (lcur - lres) < MAX_NORM)
        {
            addNorm(&lres, &lcur, *ptr, 0, NVariant++);
            ptr++;
        }
        pfree(res);
    }

    if (Conf->usecompound)
    {
        int         wordlen = strlen(word);
        SplitVar   *ptr,
                   *var = SplitToVariants(Conf, NULL, NULL, word, wordlen, 0, -1);
        int         i;

        while (var)
        {
            if (var->nstem > 1)
            {
                char      **subres = NormalizeSubWord(Conf, var->stem[var->nstem - 1], FF_COMPOUNDLAST);

                if (subres)
                {
                    char      **subptr = subres;

                    while (*subptr)
                    {
                        for (i = 0; i < var->nstem - 1; i++)
                        {
                            addNorm(&lres, &lcur, (subptr == subres) ? var->stem[i] : pstrdup(var->stem[i]), 0, NVariant);
                        }

                        addNorm(&lres, &lcur, *subptr, 0, NVariant);
                        subptr++;
                        NVariant++;
                    }

                    pfree(subres);
                    var->stem[0] = NULL;
                    pfree(var->stem[var->nstem - 1]);
                }
            }

            for (i = 0; i < var->nstem && var->stem[i]; i++)
                pfree(var->stem[i]);
            ptr = var->next;
            pfree(var->stem);
            pfree(var);
            var = ptr;
        }
    }

    return lres;
}