/* This file is part of the Zebra server.
   Copyright (C) Index Data

Zebra is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

*/

#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>

#include <yaz/tpath.h>
#include <yaz/snprintf.h>
#include <idzebra/util.h>
#include <dfa.h>
#include <idzebra/recgrs.h>

#if HAVE_TCL_H
#include <tcl.h>

#if MAJOR_VERSION >= 8
#define HAVE_TCL_OBJECTS
#endif
#endif

#define REGX_DEBUG 0

#define F_WIN_EOF 2000000000
#define F_WIN_READ 1

#define REGX_EOF     0
#define REGX_PATTERN 1
#define REGX_BODY    2
#define REGX_BEGIN   3
#define REGX_END     4
#define REGX_CODE    5
#define REGX_CONTEXT 6
#define REGX_INIT    7

#define REGX_MAX_ARGS 20

struct regxCode {
    char *str;
#if HAVE_TCL_OBJECTS
    Tcl_Obj *tcl_obj;
#endif
};

struct lexRuleAction {
    int which;
    union {
        struct {
            struct DFA *dfa;    /* REGX_PATTERN */
            int body;
        } pattern;
        struct regxCode *code;  /* REGX_CODE */
    } u;
    struct lexRuleAction *next;
};

struct lexRuleInfo {
    int no;
    struct lexRuleAction *actionList;
};

struct lexRule {
    struct lexRuleInfo info;
    struct lexRule *next;
};

struct lexContext {
    char *name;
    struct DFA *dfa;
    struct lexRule *rules;
    struct lexRuleInfo **fastRule;
    int ruleNo;
    int initFlag;

    struct lexRuleAction *beginActionList;
    struct lexRuleAction *endActionList;
    struct lexRuleAction *initActionList;
    struct lexContext *next;
};

struct lexConcatBuf {
    int max;
    char *buf;
};

struct lexSpec {
    char *name;
    struct lexContext *context;

    struct lexContext **context_stack;
    int context_stack_size;
    int context_stack_top;

    int lineNo;
    NMEM m;
    data1_handle dh;
#if HAVE_TCL_H
    Tcl_Interp *tcl_interp;
#endif
    struct ZebraRecStream *stream;
    off_t (*f_win_ef)(struct ZebraRecStream *s, off_t *);

    int f_win_start;      /* first byte of buffer is this file offset */
    int f_win_end;        /* last byte of buffer is this offset - 1 */
    int f_win_size;       /* size of buffer */
    char *f_win_buf;      /* buffer itself */
    int (*f_win_rf)(struct ZebraRecStream *, char *, size_t);
    off_t (*f_win_sf)(struct ZebraRecStream *, off_t);

    struct lexConcatBuf *concatBuf;
    int maxLevel;
    data1_node **d1_stack;
    int d1_level;
    int stop_flag;

    int arg_start[REGX_MAX_ARGS];
    int arg_end[REGX_MAX_ARGS];
    int arg_no;
    int ptr;
};

struct lexSpecs {
    struct lexSpec *spec;
    char type[256];
};

static char *f_win_get (struct lexSpec *spec, off_t start_pos, off_t end_pos,
                        int *size)
{
    int i, r, off = start_pos - spec->f_win_start;

    if (off >= 0 && end_pos <= spec->f_win_end)
    {
        *size = end_pos - start_pos;
        return spec->f_win_buf + off;
    }
    if (off < 0 || start_pos >= spec->f_win_end)
    {
        (*spec->f_win_sf)(spec->stream, start_pos);
        spec->f_win_start = start_pos;

        if (!spec->f_win_buf)
            spec->f_win_buf = (char *) xmalloc (spec->f_win_size);
        *size = (*spec->f_win_rf)(spec->stream, spec->f_win_buf,
                                  spec->f_win_size);
        spec->f_win_end = spec->f_win_start + *size;

        if (*size > end_pos - start_pos)
            *size = end_pos - start_pos;
        return spec->f_win_buf;
    }
    for (i = 0; i<spec->f_win_end - start_pos; i++)
        spec->f_win_buf[i] = spec->f_win_buf[i + off];
    r = (*spec->f_win_rf)(spec->stream,
                          spec->f_win_buf + i,
                          spec->f_win_size - i);
    spec->f_win_start = start_pos;
    spec->f_win_end += r;
    *size = i + r;
    if (*size > end_pos - start_pos)
        *size = end_pos - start_pos;
    return spec->f_win_buf;
}

static int f_win_advance (struct lexSpec *spec, int *pos)
{
    int size;
    char *buf;

    if (*pos >= spec->f_win_start && *pos < spec->f_win_end)
        return spec->f_win_buf[(*pos)++ - spec->f_win_start];
    if (*pos == F_WIN_EOF)
        return 0;
    buf = f_win_get (spec, *pos, *pos+1, &size);
    if (size == 1)
    {
        (*pos)++;
        return *buf;
    }
    *pos = F_WIN_EOF;
    return 0;
}

static void regxCodeDel (struct regxCode **pp)
{
    struct regxCode *p = *pp;
    if (p)
    {
#if HAVE_TCL_OBJECTS
        if (p->tcl_obj)
            Tcl_DecrRefCount (p->tcl_obj);
#endif
        xfree (p->str);
        xfree (p);
        *pp = NULL;
    }
}

static void regxCodeMk (struct regxCode **pp, const char *buf, int len)
{
    struct regxCode *p;

    p = (struct regxCode *) xmalloc (sizeof(*p));
    p->str = (char *) xmalloc (len+1);
    memcpy (p->str, buf, len);
    p->str[len] = '\0';
#if HAVE_TCL_OBJECTS
    p->tcl_obj = Tcl_NewStringObj ((char *) buf, len);
    if (p->tcl_obj)
        Tcl_IncrRefCount (p->tcl_obj);
#endif
    *pp = p;
}

static struct DFA *lexSpecDFA (void)
{
    struct DFA *dfa;

    dfa = dfa_init ();
    dfa_parse_cmap_del (dfa, ' ');
    dfa_parse_cmap_del (dfa, '\t');
    dfa_parse_cmap_add (dfa, '/', 0);
    return dfa;
}

static void actionListDel (struct lexRuleAction **rap)
{
    struct lexRuleAction *ra1, *ra;

    for (ra = *rap; ra; ra = ra1)
    {
        ra1 = ra->next;
        switch (ra->which)
        {
        case REGX_PATTERN:
            dfa_delete (&ra->u.pattern.dfa);
            break;
        case REGX_CODE:
            regxCodeDel (&ra->u.code);
            break;
        }
        xfree (ra);
    }
    *rap = NULL;
}

static struct lexContext *lexContextCreate (const char *name)
{
    struct lexContext *p = (struct lexContext *) xmalloc (sizeof(*p));

    p->name = xstrdup (name);
    p->ruleNo = 1;
    p->initFlag = 0;
    p->dfa = lexSpecDFA ();
    p->rules = NULL;
    p->fastRule = NULL;
    p->beginActionList = NULL;
    p->endActionList = NULL;
    p->initActionList = NULL;
    p->next = NULL;
    return p;
}

static void lexContextDestroy (struct lexContext *p)
{
    struct lexRule *rp, *rp1;

    dfa_delete (&p->dfa);
    xfree (p->fastRule);
    for (rp = p->rules; rp; rp = rp1)
    {
        rp1 = rp->next;
        actionListDel (&rp->info.actionList);
        xfree (rp);
    }
    actionListDel (&p->beginActionList);
    actionListDel (&p->endActionList);
    actionListDel (&p->initActionList);
    xfree (p->name);
    xfree (p);
}

static struct lexSpec *lexSpecCreate (const char *name, data1_handle dh)
{
    struct lexSpec *p;
    int i;

    p = (struct lexSpec *) xmalloc (sizeof(*p));
    p->name = (char *) xmalloc (strlen(name)+1);
    strcpy (p->name, name);

#if HAVE_TCL_H
    p->tcl_interp = 0;
#endif
    p->dh = dh;
    p->context = NULL;
    p->context_stack_size = 100;
    p->context_stack = (struct lexContext **)
        xmalloc (sizeof(*p->context_stack) * p->context_stack_size);
    p->f_win_buf = NULL;

    p->maxLevel = 128;
    p->concatBuf = (struct lexConcatBuf *)
        xmalloc (sizeof(*p->concatBuf) * p->maxLevel);
    for (i = 0; i < p->maxLevel; i++)
    {
        p->concatBuf[i].max = 0;
        p->concatBuf[i].buf = 0;
    }
    p->d1_stack = (data1_node **) xmalloc (sizeof(*p->d1_stack) * p->maxLevel);
    p->d1_level = 0;
    return p;
}

static void lexSpecDestroy (struct lexSpec **pp)
{
    struct lexSpec *p;
    struct lexContext *lt;
    int i;

    assert (pp);
    p = *pp;
    if (!p)
        return ;

    for (i = 0; i < p->maxLevel; i++)
        xfree (p->concatBuf[i].buf);
    xfree (p->concatBuf);

    lt = p->context;
    while (lt)
    {
        struct lexContext *lt_next = lt->next;
        lexContextDestroy (lt);
        lt = lt_next;
    }
#if HAVE_TCL_OBJECTS
    if (p->tcl_interp)
        Tcl_DeleteInterp (p->tcl_interp);
#endif
    xfree (p->name);
    xfree (p->f_win_buf);
    xfree (p->context_stack);
    xfree (p->d1_stack);
    xfree (p);
    *pp = NULL;
}

static int readParseToken (const char **cpp, int *len)
{
    const char *cp = *cpp;
    char cmd[32];
    int i, level;

    while (*cp == ' ' || *cp == '\t' || *cp == '\n' || *cp == '\r')
        cp++;
    switch (*cp)
    {
    case '\0':
        return 0;
    case '/':
        *cpp = cp+1;
        return REGX_PATTERN;
    case '{':
        *cpp = cp+1;
        level = 1;
        while (*++cp)
        {
            if (*cp == '{')
                level++;
            else if (*cp == '}')
            {
                level--;
                if (level == 0)
                    break;
            }
        }
        *len = cp - *cpp;
        return REGX_CODE;
    default:
        i = 0;
        while (1)
        {
            if (*cp >= 'a' && *cp <= 'z')
                cmd[i] = *cp;
            else if (*cp >= 'A' && *cp <= 'Z')
                cmd[i] = *cp + 'a' - 'A';
            else
                break;
            if (i < (int) sizeof(cmd)-2)
                i++;
            cp++;
        }
        cmd[i] = '\0';
        if (i == 0)
        {
            yaz_log (YLOG_WARN, "bad character %d %c", *cp, *cp);
            cp++;
            while (*cp && *cp != ' ' && *cp != '\t' &&
                   *cp != '\n' && *cp != '\r')
                cp++;
            *cpp = cp;
            return 0;
        }
        *cpp = cp;
        if (!strcmp (cmd, "begin"))
            return REGX_BEGIN;
        else if (!strcmp (cmd, "end"))
            return REGX_END;
        else if (!strcmp (cmd, "body"))
            return REGX_BODY;
        else if (!strcmp (cmd, "context"))
            return REGX_CONTEXT;
        else if (!strcmp (cmd, "init"))
            return REGX_INIT;
        else
        {
            yaz_log (YLOG_WARN, "bad command %s", cmd);
            return 0;
        }
    }
}

static int actionListMk (struct lexSpec *spec, const char *s,
                         struct lexRuleAction **ap)
{
    int r, tok, len;
    int bodyMark = 0;
    const char *s0;

    while ((tok = readParseToken (&s, &len)))
    {
        switch (tok)
        {
        case REGX_BODY:
            bodyMark = 1;
            continue;
        case REGX_CODE:
            *ap = (struct lexRuleAction *) xmalloc (sizeof(**ap));
            (*ap)->which = tok;
            regxCodeMk (&(*ap)->u.code, s, len);
            s += len+1;
            break;
        case REGX_PATTERN:
            *ap = (struct lexRuleAction *) xmalloc (sizeof(**ap));
            (*ap)->which = tok;
            (*ap)->u.pattern.body = bodyMark;
            bodyMark = 0;
            (*ap)->u.pattern.dfa = lexSpecDFA ();
            s0 = s;
            r = dfa_parse ((*ap)->u.pattern.dfa, &s);
            if (r || *s != '/')
            {
                int pos = s - s0;
                xfree (*ap);
                *ap = NULL;
                yaz_log(YLOG_WARN, "regular expression error '%.*s'", pos, s0);
                return -1;
            }
            else
            {
                int pos = s - s0;
                if (debug_dfa_tran)
                    printf("pattern: %.*s\n", pos, s0);
                dfa_mkstate((*ap)->u.pattern.dfa);
                s++;
            }
            break;
        case REGX_BEGIN:
            yaz_log (YLOG_WARN, "cannot use BEGIN here");
            continue;
        case REGX_INIT:
            yaz_log (YLOG_WARN, "cannot use INIT here");
            continue;
        case REGX_END:
            *ap = (struct lexRuleAction *) xmalloc (sizeof(**ap));
            (*ap)->which = tok;
            break;
        }
        ap = &(*ap)->next;
    }
    *ap = NULL;
    return 0;
}

int readOneSpec (struct lexSpec *spec, const char *s)
{
    int len, r, tok;
    struct lexRule *rp;
    struct lexContext *lc;

    tok = readParseToken (&s, &len);
    if (tok == REGX_CONTEXT)
    {
        char context_name[32];
        tok = readParseToken (&s, &len);
        if (tok != REGX_CODE)
        {
            yaz_log (YLOG_WARN, "missing name after CONTEXT keyword");
            return 0;
        }
        if (len > 31)
            len = 31;
        memcpy (context_name, s, len);
        context_name[len] = '\0';
        lc = lexContextCreate (context_name);
        lc->next = spec->context;
        spec->context = lc;
        return 0;
    }
    if (!spec->context)
        spec->context = lexContextCreate ("main");

    switch (tok)
    {
    case REGX_BEGIN:
        actionListDel (&spec->context->beginActionList);
        actionListMk (spec, s, &spec->context->beginActionList);
        break;
    case REGX_END:
        actionListDel (&spec->context->endActionList);
        actionListMk (spec, s, &spec->context->endActionList);
        break;
    case REGX_INIT:
        actionListDel (&spec->context->initActionList);
        actionListMk (spec, s, &spec->context->initActionList);
        break;
    case REGX_PATTERN:
#if REGX_DEBUG
        yaz_log (YLOG_LOG, "rule %d %s", spec->context->ruleNo, s);
#endif
        r = dfa_parse (spec->context->dfa, &s);
        if (r)
        {
            yaz_log (YLOG_WARN, "regular expression error. r=%d", r);
            return -1;
        }
        if (*s != '/')
        {
            yaz_log (YLOG_WARN, "expects / at end of pattern. got %c", *s);
            return -1;
        }
        s++;
        rp = (struct lexRule *) xmalloc (sizeof(*rp));
        rp->info.no = spec->context->ruleNo++;
        rp->next = spec->context->rules;
        spec->context->rules = rp;
        actionListMk (spec, s, &rp->info.actionList);
    }
    return 0;
}

int readFileSpec (struct lexSpec *spec)
{
    struct lexContext *lc;
    int c, i, errors = 0;
    FILE *spec_inf = 0;
    WRBUF lineBuf;
    char fname[256];

#if HAVE_TCL_H
    if (spec->tcl_interp)
    {
        yaz_snprintf(fname, sizeof(fname), "%s.tflt", spec->name);
        spec_inf = data1_path_fopen (spec->dh, fname, "r");
    }
#endif
    if (!spec_inf)
    {
        yaz_snprintf(fname, sizeof(fname), "%s.flt", spec->name);
        spec_inf = data1_path_fopen (spec->dh, fname, "r");
    }
    if (!spec_inf)
    {
        yaz_log(YLOG_ERRNO|YLOG_WARN, "cannot read spec file %s", spec->name);
        return -1;
    }
    yaz_log(YLOG_LOG, "reading regx filter %s", fname);
#if HAVE_TCL_H
    if (spec->tcl_interp)
        yaz_log(YLOG_LOG, "Tcl enabled");
#endif

#if 0
    debug_dfa_trav = 0;
    debug_dfa_tran = 1;
    debug_dfa_followpos = 0;
    dfa_verbose = 1;
#endif

    lineBuf = wrbuf_alloc();
    spec->lineNo = 0;
    c = getc (spec_inf);
    while (c != EOF)
    {
        wrbuf_rewind (lineBuf);
        if (c == '#' || c == '\n' || c == ' ' || c == '\t' || c == '\r')
        {
            while (c != '\n' && c != EOF)
                c = getc (spec_inf);
            spec->lineNo++;
            if (c == '\n')
                c = getc (spec_inf);
        }
        else
        {
            int addLine = 0;

            while (1)
            {
                int c1 = c;
                wrbuf_putc(lineBuf, c);
                c = getc (spec_inf);
                while (c == '\r')
                    c = getc (spec_inf);
                if (c == EOF)
                    break;
                if (c1 == '\n')
                {
                    if (c != ' ' && c != '\t')
                        break;
                    addLine++;
                }
            }
            wrbuf_putc(lineBuf, '\0');
            readOneSpec (spec, wrbuf_buf(lineBuf));
            spec->lineNo += addLine;
        }
    }
    fclose (spec_inf);
    wrbuf_destroy(lineBuf);

    for (lc = spec->context; lc; lc = lc->next)
    {
        struct lexRule *rp;
        lc->fastRule = (struct lexRuleInfo **)
            xmalloc (sizeof(*lc->fastRule) * lc->ruleNo);
        for (i = 0; i < lc->ruleNo; i++)
            lc->fastRule[i] = NULL;
        for (rp = lc->rules; rp; rp = rp->next)
            lc->fastRule[rp->info.no] = &rp->info;
        dfa_mkstate (lc->dfa);
    }
    if (errors)
        return -1;

    return 0;
}

#if 0
static struct lexSpec *curLexSpec = NULL;
#endif

static void execData (struct lexSpec *spec,
                      const char *ebuf, int elen, int formatted_text,
                      const char *attribute_str, int attribute_len)
{
    struct data1_node *res, *parent;
    int org_len;

    if (elen == 0) /* shouldn't happen, but it does! */
        return ;
#if REGX_DEBUG
    if (elen > 80)
        yaz_log (YLOG_LOG, "data(%d bytes) %.40s ... %.*s", elen,
              ebuf, 40, ebuf + elen-40);
    else if (elen == 1 && ebuf[0] == '\n')
    {
        yaz_log (YLOG_LOG, "data(new line)");
    }
    else if (elen > 0)
        yaz_log (YLOG_LOG, "data(%d bytes) %.*s", elen, elen, ebuf);
    else
        yaz_log (YLOG_LOG, "data(%d bytes)", elen);
#endif

    if (spec->d1_level <= 1)
        return;

    parent = spec->d1_stack[spec->d1_level -1];
    assert (parent);

    if (attribute_str)
    {
        data1_xattr **ap;
        res = parent;
        if (res->which != DATA1N_tag)
            return;
        /* sweep through exising attributes.. */
        for (ap = &res->u.tag.attributes; *ap; ap = &(*ap)->next)
            if (strlen((*ap)->name) == attribute_len &&
                !memcmp((*ap)->name, attribute_str, attribute_len))
                break;
        if (!*ap)
        {
            /* new attribute. Create it with name + value */
            *ap = nmem_malloc(spec->m, sizeof(**ap));

            (*ap)->name = nmem_malloc(spec->m, attribute_len+1);
            memcpy((*ap)->name, attribute_str, attribute_len);
            (*ap)->name[attribute_len] = '\0';

            (*ap)->value = nmem_malloc(spec->m, elen+1);
            memcpy((*ap)->value, ebuf, elen);
            (*ap)->value[elen] = '\0';
            (*ap)->next = 0;
        }
        else
        {
            /* append to value if attribute already exists */
            char *nv = nmem_malloc(spec->m, elen + 1 + strlen((*ap)->value));
            strcpy(nv, (*ap)->value);
            memcpy (nv + strlen(nv), ebuf, elen);
            nv[strlen(nv)+elen] = '\0';
            (*ap)->value = nv;
        }
    }
    else
    {
        if ((res = spec->d1_stack[spec->d1_level]) &&
            res->which == DATA1N_data)
            org_len = res->u.data.len;
        else
        {
            org_len = 0;

            res = data1_mk_node2 (spec->dh, spec->m, DATA1N_data, parent);
            res->u.data.what = DATA1I_text;
            res->u.data.len = 0;
            res->u.data.formatted_text = formatted_text;
            res->u.data.data = 0;

            if (spec->d1_stack[spec->d1_level])
                spec->d1_stack[spec->d1_level]->next = res;
            spec->d1_stack[spec->d1_level] = res;
        }
        if (org_len + elen >= spec->concatBuf[spec->d1_level].max)
        {
            char *old_buf, *new_buf;

            spec->concatBuf[spec->d1_level].max = org_len + elen + 256;
            new_buf = (char *) xmalloc (spec->concatBuf[spec->d1_level].max);
            if ((old_buf = spec->concatBuf[spec->d1_level].buf))
            {
                memcpy (new_buf, old_buf, org_len);
                xfree (old_buf);
            }
            spec->concatBuf[spec->d1_level].buf = new_buf;
        }
        memcpy (spec->concatBuf[spec->d1_level].buf + org_len, ebuf, elen);
        res->u.data.len += elen;
    }
}

static void execDataP (struct lexSpec *spec,
                       const char *ebuf, int elen, int formatted_text)
{
    execData (spec, ebuf, elen, formatted_text, 0, 0);
}

static void tagDataRelease (struct lexSpec *spec)
{
    data1_node *res;

    if ((res = spec->d1_stack[spec->d1_level]) &&
        res->which == DATA1N_data &&
        res->u.data.what == DATA1I_text)
    {
        assert (!res->u.data.data);
        assert (res->u.data.len > 0);
        if (res->u.data.len > DATA1_LOCALDATA)
            res->u.data.data = (char *) nmem_malloc (spec->m, res->u.data.len);
        else
            res->u.data.data = res->lbuf;
        memcpy (res->u.data.data, spec->concatBuf[spec->d1_level].buf,
                res->u.data.len);
    }
}

static void variantBegin (struct lexSpec *spec,
                          const char *class_str, int class_len,
                          const char *type_str, int type_len,
                          const char *value_str, int value_len)
{
    struct data1_node *parent = spec->d1_stack[spec->d1_level -1];
    char tclass[DATA1_MAX_SYMBOL], ttype[DATA1_MAX_SYMBOL];
    data1_vartype *tp;
    int i;
    data1_node *res;

    if (spec->d1_level == 0)
    {
        yaz_log (YLOG_WARN, "in variant begin. No record type defined");
        return ;
    }
    if (class_len >= DATA1_MAX_SYMBOL)
        class_len = DATA1_MAX_SYMBOL-1;
    memcpy (tclass, class_str, class_len);
    tclass[class_len] = '\0';

    if (type_len >= DATA1_MAX_SYMBOL)
        type_len = DATA1_MAX_SYMBOL-1;
    memcpy (ttype, type_str, type_len);
    ttype[type_len] = '\0';

#if REGX_DEBUG
    yaz_log (YLOG_LOG, "variant begin(%s,%s,%d)", tclass, ttype,
          spec->d1_level);
#endif

    if (!(tp =
          data1_getvartypeby_absyn(spec->dh, parent->root->u.root.absyn,
                                   tclass, ttype)))
        return;

    if (parent->which != DATA1N_variant)
    {
        res = data1_mk_node2 (spec->dh, spec->m, DATA1N_variant, parent);
        if (spec->d1_stack[spec->d1_level])
            tagDataRelease (spec);
        spec->d1_stack[spec->d1_level] = res;
        spec->d1_stack[++(spec->d1_level)] = NULL;
    }
    for (i = spec->d1_level-1; spec->d1_stack[i]->which == DATA1N_variant; i--)
        if (spec->d1_stack[i]->u.variant.type == tp)
        {
            spec->d1_level = i;
            break;
        }

#if REGX_DEBUG
    yaz_log (YLOG_LOG, "variant node(%d)", spec->d1_level);
#endif
    parent = spec->d1_stack[spec->d1_level-1];
    res = data1_mk_node2 (spec->dh, spec->m, DATA1N_variant, parent);
    res->u.variant.type = tp;

    if (value_len >= DATA1_LOCALDATA)
        value_len =DATA1_LOCALDATA-1;
    memcpy (res->lbuf, value_str, value_len);
    res->lbuf[value_len] = '\0';

    res->u.variant.value = res->lbuf;

    if (spec->d1_stack[spec->d1_level])
        tagDataRelease (spec);
    spec->d1_stack[spec->d1_level] = res;
    spec->d1_stack[++(spec->d1_level)] = NULL;
}

static void tagStrip (const char **tag, int *len)
{
    int i;

    for (i = *len; i > 0 && isspace((*tag)[i-1]); --i)
        ;
    *len = i;
    for (i = 0; i < *len && isspace((*tag)[i]); i++)
        ;
    *tag += i;
    *len -= i;
}

static void tagBegin (struct lexSpec *spec,
                      const char *tag, int len)
{
    if (spec->d1_level == 0)
    {
        yaz_log (YLOG_WARN, "in element begin. No record type defined");
        return ;
    }
    tagStrip (&tag, &len);
    if (spec->d1_stack[spec->d1_level])
        tagDataRelease (spec);

#if REGX_DEBUG
    yaz_log (YLOG_LOG, "begin tag(%.*s, %d)", len, tag, spec->d1_level);
#endif

    spec->d1_stack[spec->d1_level] = data1_mk_tag_n (
        spec->dh, spec->m, tag, len, 0, spec->d1_stack[spec->d1_level -1]);
    spec->d1_stack[++(spec->d1_level)] = NULL;
}

static void tagEnd (struct lexSpec *spec, int min_level,
                    const char *tag, int len)
{
    tagStrip (&tag, &len);
    while (spec->d1_level > min_level)
    {
        tagDataRelease (spec);
        (spec->d1_level)--;
        if (spec->d1_level == 0)
            break;
        if ((spec->d1_stack[spec->d1_level]->which == DATA1N_tag) &&
            (!tag ||
             (strlen(spec->d1_stack[spec->d1_level]->u.tag.tag) ==
              (size_t) len &&
              !memcmp (spec->d1_stack[spec->d1_level]->u.tag.tag, tag, len))))
            break;
    }
#if REGX_DEBUG
    yaz_log (YLOG_LOG, "end tag(%d)", spec->d1_level);
#endif
}


static int tryMatch (struct lexSpec *spec, int *pptr, int *mptr,
                     struct DFA *dfa, int greedy)
{
    struct DFA_state *state = dfa->states[0];
    struct DFA_tran *t;
    unsigned char c = 0;
    unsigned char c_prev = 0;
    int ptr = *pptr;          /* current pointer */
    int start_ptr = *pptr;    /* first char of match */
    int last_ptr = 0;         /* last char of match */
    int last_rule = 0;        /* rule number of current match */
    int restore_ptr = 0;
    int i;

    if (ptr)
    {
        --ptr;
        c = f_win_advance (spec, &ptr);
    }
    while (1)
    {
        if (dfa->states[0] == state)
        {
            c_prev = c;
            restore_ptr = ptr;
        }
        c = f_win_advance (spec, &ptr);

        if (ptr == F_WIN_EOF)
        {
            if (last_rule)
            {
                *mptr = start_ptr;
                *pptr = last_ptr;
                return 1;
            }
            break;
        }

        t = state->trans;
        i = state->tran_no;
        while (1)
            if (--i < 0)    /* no transition for character c */
            {
                if (last_rule)
                {
                    *mptr = start_ptr;     /* match starts here */
                    *pptr = last_ptr;      /* match end here (+1) */
                    return 1;
                }
                state = dfa->states[0];

                ptr = restore_ptr;
                c = f_win_advance (spec, &ptr);

                start_ptr = ptr;

                break;
            }
            else if (c >= t->ch[0] && c <= t->ch[1])
            {
                state = dfa->states[t->to];
                if (state->rule_no && c_prev == '\n')
                {
                    last_rule = state->rule_no;
                    last_ptr = ptr;
                }
                else if (state->rule_nno)
                {
                    last_rule = state->rule_nno;
                    last_ptr = ptr;
                }
                break;
            }
            else
                t++;
    }
    return 0;
}

static int execTok (struct lexSpec *spec, const char **src,
                    const char **tokBuf, int *tokLen)
{
    const char *s = *src;

    while (*s == ' ' || *s == '\t')
        s++;
    if (!*s)
        return 0;
    if (*s == '$' && s[1] >= '0' && s[1] <= '9')
    {
        int n = 0;
        s++;
        while (*s >= '0' && *s <= '9')
            n = n*10 + (*s++ -'0');
        if (spec->arg_no == 0)
        {
            *tokBuf = "";
            *tokLen = 0;
        }
        else
        {
            if (n >= spec->arg_no)
                n = spec->arg_no-1;
            *tokBuf = f_win_get (spec, spec->arg_start[n], spec->arg_end[n],
                                 tokLen);
        }
    }
    else if (*s == '\"')
    {
        *tokBuf = ++s;
        while (*s && *s != '\"')
            s++;
        *tokLen = s - *tokBuf;
        if (*s)
            s++;
        *src = s;
    }
    else if (*s == '\n' || *s == ';')
    {
        *src = s+1;
        return 1;
    }
    else if (*s == '-')
    {
        *tokBuf = s++;
        while (*s && *s != ' ' && *s != '\t' && *s != '\n' && *s != '\r' &&
               *s != ';')
            s++;
        *tokLen = s - *tokBuf;
        *src = s;
        return 3;
    }
    else
    {
        *tokBuf = s++;
        while (*s && *s != ' ' && *s != '\t' && *s != '\n' && *s != '\r' &&
               *s != ';')
            s++;
        *tokLen = s - *tokBuf;
    }
    *src = s;
    return 2;
}

static char *regxStrz (const char *src, int len, char *str)
{
    if (len > 63)
        len = 63;
    memcpy (str, src, len);
    str[len] = '\0';
    return str;
}

#if HAVE_TCL_H
static int cmd_tcl_begin (ClientData clientData, Tcl_Interp *interp,
                          int argc, const char **argv)
{
    struct lexSpec *spec = (struct lexSpec *) clientData;
    if (argc < 2)
        return TCL_ERROR;
    if (!strcmp(argv[1], "record") && argc == 3)
    {
        const char *absynName = argv[2];
        data1_node *res;

#if REGX_DEBUG
        yaz_log (YLOG_LOG, "begin record %s", absynName);
#endif
        res = data1_mk_root (spec->dh, spec->m, absynName);

        spec->d1_level = 0;

        spec->d1_stack[spec->d1_level++] = res;

        res = data1_mk_tag (spec->dh, spec->m, absynName, 0, res);

        spec->d1_stack[spec->d1_level++] = res;

        spec->d1_stack[spec->d1_level] = NULL;
    }
    else if (!strcmp(argv[1], "element") && argc == 3)
    {
        tagBegin (spec, argv[2], strlen(argv[2]));
    }
    else if (!strcmp (argv[1], "variant") && argc == 5)
    {
        variantBegin (spec, argv[2], strlen(argv[2]),
                      argv[3], strlen(argv[3]),
                      argv[4], strlen(argv[4]));
    }
    else if (!strcmp (argv[1], "context") && argc == 3)
    {
        struct lexContext *lc = spec->context;
#if REGX_DEBUG
        yaz_log (YLOG_LOG, "begin context %s",argv[2]);
#endif
        while (lc && strcmp (argv[2], lc->name))
            lc = lc->next;
        if (lc)
        {
            spec->context_stack[++(spec->context_stack_top)] = lc;
        }
        else
            yaz_log (YLOG_WARN, "unknown context %s", argv[2]);
    }
    else
        return TCL_ERROR;
    return TCL_OK;
}

static int cmd_tcl_end (ClientData clientData, Tcl_Interp *interp,
                        int argc, const char **argv)
{
    struct lexSpec *spec = (struct lexSpec *) clientData;
    if (argc < 2)
        return TCL_ERROR;

    if (!strcmp (argv[1], "record"))
    {
        while (spec->d1_level)
        {
            tagDataRelease (spec);
            (spec->d1_level)--;
        }
#if REGX_DEBUG
        yaz_log (YLOG_LOG, "end record");
#endif
        spec->stop_flag = 1;
    }
    else if (!strcmp (argv[1], "element"))
    {
        int min_level = 2;
        const char *element = 0;
        if (argc >= 3 && !strcmp(argv[2], "-record"))
        {
            min_level = 0;
            if (argc == 4)
                element = argv[3];
        }
        else
            if (argc == 3)
                element = argv[2];
        tagEnd (spec, min_level, element, (element ? strlen(element) : 0));
        if (spec->d1_level <= 1)
        {
#if REGX_DEBUG
            yaz_log (YLOG_LOG, "end element end records");
#endif
            spec->stop_flag = 1;
        }
    }
    else if (!strcmp (argv[1], "context"))
    {
#if REGX_DEBUG
        yaz_log (YLOG_LOG, "end context");
#endif
        if (spec->context_stack_top)
            (spec->context_stack_top)--;
    }
    else
        return TCL_ERROR;
    return TCL_OK;
}

static int cmd_tcl_data (ClientData clientData, Tcl_Interp *interp,
                         int argc, const char **argv)
{
    int argi = 1;
    int textFlag = 0;
    const char *element = 0;
    const char *attribute = 0;
    struct lexSpec *spec = (struct lexSpec *) clientData;

    while (argi < argc)
    {
        if (!strcmp("-text", argv[argi]))
        {
            textFlag = 1;
            argi++;
        }
        else if (!strcmp("-element", argv[argi]))
        {
            argi++;
            if (argi < argc)
                element = argv[argi++];
        }
        else if (!strcmp("-attribute", argv[argi]))
        {
            argi++;
            if (argi < argc)
                attribute = argv[argi++];
        }
        else
            break;
    }
    if (element)
        tagBegin (spec, element, strlen(element));

    while (argi < argc)
    {
#if TCL_MAJOR_VERSION > 8 || (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION > 0)
        Tcl_DString ds;
        char *native = Tcl_UtfToExternalDString(0, argv[argi], -1, &ds);
        execData (spec, native, strlen(native), textFlag, attribute,
                  attribute ? strlen(attribute) : 0);
        Tcl_DStringFree (&ds);
#else
        execData (spec, argv[argi], strlen(argv[argi]), textFlag, attribute,
                  attribute ? strlen(attribute) : 0);
#endif
        argi++;
    }
    if (element)
        tagEnd (spec, 2, NULL, 0);
    return TCL_OK;
}

static int cmd_tcl_unread (ClientData clientData, Tcl_Interp *interp,
                           int argc, const char **argv)
{
    struct lexSpec *spec = (struct lexSpec *) clientData;
    int argi = 1;
    int offset = 0;
    int no;

    while (argi < argc)
    {
        if (!strcmp("-offset", argv[argi]))
        {
            argi++;
            if (argi < argc)
            {
                offset = atoi(argv[argi]);
                argi++;
            }
        }
        else
            break;
    }
    if (argi != argc-1)
        return TCL_ERROR;
    no = atoi(argv[argi]);
    if (no >= spec->arg_no)
        no = spec->arg_no - 1;
    spec->ptr = spec->arg_start[no] + offset;
    return TCL_OK;
}

static void execTcl (struct lexSpec *spec, struct regxCode *code)
{
    int i;
    int ret;
    for (i = 0; i < spec->arg_no; i++)
    {
        char var_name[10], *var_buf;
        int var_len, ch;

        yaz_snprintf(var_name, sizeof(var_name), "%d", i);
        var_buf = f_win_get(spec, spec->arg_start[i], spec->arg_end[i],
                            &var_len);
        if (var_buf)
        {
            ch = var_buf[var_len];
            var_buf[var_len] = '\0';
            Tcl_SetVar (spec->tcl_interp, var_name, var_buf, 0);
            var_buf[var_len] = ch;
        }
    }
#if HAVE_TCL_OBJECTS
    ret = Tcl_GlobalEvalObj(spec->tcl_interp, code->tcl_obj);
#else
    ret = Tcl_GlobalEval (spec->tcl_interp, code->str);
#endif
    if (ret != TCL_OK)
    {
        const char *err = Tcl_GetVar(spec->tcl_interp, "errorInfo", 0);
        yaz_log(YLOG_FATAL, "Tcl error, line=%d, \"%s\"\n%s",
#if TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION <= 5
                spec->tcl_interp->errorLine,
                spec->tcl_interp->result,
#else
                Tcl_GetErrorLine(spec->tcl_interp),
                Tcl_GetStringResult(spec->tcl_interp),
#endif
            err ? err : "[NO ERRORINFO]");
    }
}
/* HAVE_TCL_H */
#endif

static void execCode (struct lexSpec *spec, struct regxCode *code)
{
    const char *s = code->str;
    int cmd_len, r;
    const char *cmd_str;

    r = execTok (spec, &s, &cmd_str, &cmd_len);
    while (r)
    {
        char *p, ptmp[64];

        if (r == 1)
        {
            r = execTok (spec, &s, &cmd_str, &cmd_len);
            continue;
        }
        p = regxStrz (cmd_str, cmd_len, ptmp);
        if (!strcmp (p, "begin"))
        {
            r = execTok (spec, &s, &cmd_str, &cmd_len);
            if (r < 2)
            {
                yaz_log (YLOG_WARN, "missing keyword after 'begin'");
                continue;
            }
            p = regxStrz (cmd_str, cmd_len, ptmp);
            if (!strcmp (p, "record"))
            {
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                    continue;
                if (spec->d1_level <= 1)
                {
                    static char absynName[64];
                    data1_node *res;

                    if (cmd_len > 63)
                        cmd_len = 63;
                    memcpy (absynName, cmd_str, cmd_len);
                    absynName[cmd_len] = '\0';
#if REGX_DEBUG
                    yaz_log (YLOG_LOG, "begin record %s", absynName);
#endif
                    res = data1_mk_root (spec->dh, spec->m, absynName);

                    spec->d1_level = 0;

                    spec->d1_stack[spec->d1_level++] = res;

                    res = data1_mk_tag (spec->dh, spec->m, absynName, 0, res);

                    spec->d1_stack[spec->d1_level++] = res;

                    spec->d1_stack[spec->d1_level] = NULL;
                }
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else if (!strcmp (p, "element"))
            {
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                    continue;
                tagBegin (spec, cmd_str, cmd_len);
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else if (!strcmp (p, "variant"))
            {
                int class_len;
                const char *class_str = NULL;
                int type_len;
                const char *type_str = NULL;
                int value_len;
                const char *value_str = NULL;
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                    continue;
                class_str = cmd_str;
                class_len = cmd_len;
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                    continue;
                type_str = cmd_str;
                type_len = cmd_len;

                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                    continue;
                value_str = cmd_str;
                value_len = cmd_len;

                variantBegin (spec, class_str, class_len,
                              type_str, type_len, value_str, value_len);


                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else if (!strcmp (p, "context"))
            {
                if (r > 1)
                {
                    struct lexContext *lc = spec->context;
                    r = execTok (spec, &s, &cmd_str, &cmd_len);
                    p = regxStrz (cmd_str, cmd_len, ptmp);
#if REGX_DEBUG
                    yaz_log (YLOG_LOG, "begin context %s", p);
#endif
                    while (lc && strcmp (p, lc->name))
                        lc = lc->next;
                    if (lc)
                        spec->context_stack[++(spec->context_stack_top)] = lc;
                    else
                        yaz_log (YLOG_WARN, "unknown context %s", p);

                }
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else
            {
                yaz_log (YLOG_WARN, "bad keyword '%s' after begin", p);
            }
        }
        else if (!strcmp (p, "end"))
        {
            r = execTok (spec, &s, &cmd_str, &cmd_len);
            if (r < 2)
            {
                yaz_log (YLOG_WARN, "missing keyword after 'end'");
                continue;
            }
            p = regxStrz (cmd_str, cmd_len, ptmp);
            if (!strcmp (p, "record"))
            {
                while (spec->d1_level)
                {
                    tagDataRelease (spec);
                    (spec->d1_level)--;
                }
                r = execTok (spec, &s, &cmd_str, &cmd_len);
#if REGX_DEBUG
                yaz_log (YLOG_LOG, "end record");
#endif
                spec->stop_flag = 1;
            }
            else if (!strcmp (p, "element"))
            {
                int min_level = 2;
                while ((r = execTok (spec, &s, &cmd_str, &cmd_len)) == 3)
                {
                    if (cmd_len==7 && !memcmp ("-record", cmd_str, cmd_len))
                        min_level = 0;
                }
                if (r > 2)
                {
                    tagEnd (spec, min_level, cmd_str, cmd_len);
                    r = execTok (spec, &s, &cmd_str, &cmd_len);
                }
                else
                    tagEnd (spec, min_level, NULL, 0);
                if (spec->d1_level <= 1)
                {
#if REGX_DEBUG
                    yaz_log (YLOG_LOG, "end element end records");
#endif
                    spec->stop_flag = 1;
                }

            }
            else if (!strcmp (p, "context"))
            {
#if REGX_DEBUG
                yaz_log (YLOG_LOG, "end context");
#endif
                if (spec->context_stack_top)
                    (spec->context_stack_top)--;
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else
                yaz_log (YLOG_WARN, "bad keyword '%s' after end", p);
        }
        else if (!strcmp (p, "data"))
        {
            int textFlag = 0;
            int element_len;
            const char *element_str = NULL;
            int attribute_len;
            const char *attribute_str = NULL;

            while ((r = execTok (spec, &s, &cmd_str, &cmd_len)) == 3)
            {
                if (cmd_len==5 && !memcmp ("-text", cmd_str, cmd_len))
                    textFlag = 1;
                else if (cmd_len==8 && !memcmp ("-element", cmd_str, cmd_len))
                {
                    r = execTok (spec, &s, &element_str, &element_len);
                    if (r < 2)
                        break;
                }
                else if (cmd_len==10 && !memcmp ("-attribute", cmd_str,
                                                 cmd_len))
                {
                    r = execTok (spec, &s, &attribute_str, &attribute_len);
                    if (r < 2)
                        break;
                }
                else
                    yaz_log (YLOG_WARN, "bad data option: %.*s",
                          cmd_len, cmd_str);
            }
            if (r != 2)
            {
                yaz_log (YLOG_WARN, "missing data item after data");
                continue;
            }
            if (element_str)
                tagBegin (spec, element_str, element_len);
            do
            {
                execData (spec, cmd_str, cmd_len, textFlag,
                          attribute_str, attribute_len);
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            } while (r > 1);
            if (element_str)
                tagEnd (spec, 2, NULL, 0);
        }
        else if (!strcmp (p, "unread"))
        {
            int no, offset;
            r = execTok (spec, &s, &cmd_str, &cmd_len);
            if (r==3 && cmd_len == 7 && !memcmp ("-offset", cmd_str, cmd_len))
            {
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                if (r < 2)
                {
                    yaz_log (YLOG_WARN, "missing number after -offset");
                    continue;
                }
                p = regxStrz (cmd_str, cmd_len, ptmp);
                offset = atoi (p);
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            }
            else
                offset = 0;
            if (r < 2)
            {
                yaz_log (YLOG_WARN, "missing index after unread command");
                continue;
            }
            if (cmd_len != 1 || *cmd_str < '0' || *cmd_str > '9')
            {
                yaz_log (YLOG_WARN, "bad index after unread command");
                continue;
            }
            else
            {
                no = *cmd_str - '0';
                if (no >= spec->arg_no)
                    no = spec->arg_no - 1;
                spec->ptr = spec->arg_start[no] + offset;
            }
            r = execTok (spec, &s, &cmd_str, &cmd_len);
        }
        else if (!strcmp (p, "context"))
        {
            if (r > 1)
            {
                struct lexContext *lc = spec->context;
                r = execTok (spec, &s, &cmd_str, &cmd_len);
                p = regxStrz (cmd_str, cmd_len, ptmp);

                while (lc && strcmp (p, lc->name))
                    lc = lc->next;
                if (lc)
                    spec->context_stack[spec->context_stack_top] = lc;
                else
                    yaz_log (YLOG_WARN, "unknown context %s", p);

            }
            r = execTok (spec, &s, &cmd_str, &cmd_len);
        }
        else
        {
            yaz_log (YLOG_WARN, "unknown code command '%.*s'", cmd_len, cmd_str);
            r = execTok (spec, &s, &cmd_str, &cmd_len);
            continue;
        }
        if (r > 1)
        {
            yaz_log (YLOG_WARN, "ignoring token %.*s", cmd_len, cmd_str);
            do {
                r = execTok (spec, &s, &cmd_str, &cmd_len);
            } while (r > 1);
        }
    }
}


static int execAction (struct lexSpec *spec, struct lexRuleAction *ap,
                       int start_ptr, int *pptr)
{
    int sptr;
    int arg_no = 1;

    if (!ap)
        return 1;
    spec->arg_start[0] = start_ptr;
    spec->arg_end[0] = *pptr;

    while (ap && arg_no < REGX_MAX_ARGS)
    {
        switch (ap->which)
        {
        case REGX_PATTERN:
            if (ap->u.pattern.body)
            {
                spec->arg_start[arg_no] = *pptr;
                if (!tryMatch (spec, pptr, &sptr, ap->u.pattern.dfa, 0))
                {
                    spec->arg_end[arg_no] = F_WIN_EOF;
                    arg_no++;
                    spec->arg_start[arg_no] = F_WIN_EOF;
                    spec->arg_end[arg_no] = F_WIN_EOF;
                    yaz_log(YLOG_DEBUG, "Pattern match rest of record");
                    *pptr = F_WIN_EOF;
                }
                else
                {
                    spec->arg_end[arg_no] = sptr;
                    arg_no++;
                    spec->arg_start[arg_no] = sptr;
                    spec->arg_end[arg_no] = *pptr;
                }
            }
            else
            {
                spec->arg_start[arg_no] = *pptr;
                if (!tryMatch (spec, pptr, &sptr, ap->u.pattern.dfa, 1))
                    return 1;
                if (sptr != spec->arg_start[arg_no])
                    return 1;
                spec->arg_end[arg_no] = *pptr;
            }
            arg_no++;
            break;
        case REGX_CODE:
            spec->arg_no = arg_no;
            spec->ptr = *pptr;
#if HAVE_TCL_H
            if (spec->tcl_interp)
                execTcl(spec, ap->u.code);
            else
                execCode (spec, ap->u.code);
#else
            execCode (spec, ap->u.code);
#endif
            *pptr = spec->ptr;
            if (spec->stop_flag)
                return 0;
            break;
        case REGX_END:
            spec->arg_start[arg_no] = *pptr;
            spec->arg_end[arg_no] = F_WIN_EOF;
            arg_no++;
            *pptr = F_WIN_EOF;
        }
        ap = ap->next;
    }
    return 1;
}

static int execRule (struct lexSpec *spec, struct lexContext *context,
                     int ruleNo, int start_ptr, int *pptr)
{
#if REGX_DEBUG
    yaz_log (YLOG_LOG, "exec rule %d", ruleNo);
#endif
    return execAction (spec, context->fastRule[ruleNo]->actionList,
                       start_ptr, pptr);
}

int lexNode (struct lexSpec *spec, int *ptr)
{
    struct lexContext *context = spec->context_stack[spec->context_stack_top];
    struct DFA_state *state = context->dfa->states[0];
    struct DFA_tran *t;
    unsigned char c;
    unsigned char c_prev = '\n';
    int i;
    int last_rule = 0;        /* rule number of current match */
    int last_ptr = *ptr;      /* last char of match */
    int start_ptr = *ptr;     /* first char of match */
    int skip_ptr = *ptr;      /* first char of run */
    int more = 0;

    while (1)
    {
        c = f_win_advance (spec, ptr);
        if (*ptr == F_WIN_EOF)
        {
            /* end of file met */
            if (last_rule)
            {
                /* there was a match */
                if (skip_ptr < start_ptr)
                {
                    /* deal with chars that didn't match */
                    int size;
                    char *buf;
                    buf = f_win_get (spec, skip_ptr, start_ptr, &size);
                    execDataP (spec, buf, size, 0);
                }
                /* restore pointer */
                *ptr = last_ptr;
                /* execute rule */
                if (!execRule (spec, context, last_rule, start_ptr, ptr))
                    return more;
                /* restore skip pointer */
                skip_ptr = *ptr;
                last_rule = 0;
            }
            else if (skip_ptr < *ptr)
            {
                /* deal with chars that didn't match */
                int size;
                char *buf;
                buf = f_win_get (spec, skip_ptr, *ptr, &size);
                execDataP (spec, buf, size, 0);
            }
            state = context->dfa->states[0];
            if (*ptr == F_WIN_EOF)
                return more;
        }
        t = state->trans;
        i = state->tran_no;
        while (1)
            if (--i < 0)
            {   /* no transition for character c ... */
                if (last_rule)
                {
                    if (skip_ptr < start_ptr)
                    {
                        /* deal with chars that didn't match */
                        int size;
                        char *buf;
                        buf = f_win_get (spec, skip_ptr, start_ptr, &size);
                        execDataP (spec, buf, size, 0);
                    }
                    /* restore pointer */
                    *ptr = last_ptr;
                    if (!execRule (spec, context, last_rule, start_ptr, ptr))
                    {
                        if (spec->f_win_ef && *ptr != F_WIN_EOF)
                        {
                            off_t end_offset = *ptr;
#if REGX_DEBUG
                            yaz_log (YLOG_LOG, "regx: endf ptr=%d", *ptr);
#endif
                            (*spec->f_win_ef)(spec->stream, &end_offset);
                        }
                        return more;
                    }
                    context = spec->context_stack[spec->context_stack_top];
                    skip_ptr = *ptr;
                    last_rule = 0;
                    last_ptr = start_ptr = *ptr;
                    if (start_ptr > 0)
                    {
                        --start_ptr;
                        c_prev = f_win_advance (spec, &start_ptr);
                    }
                }
                else
                {
                    c_prev = f_win_advance (spec, &start_ptr);
                    *ptr = start_ptr;
                }
                state = context->dfa->states[0];
                break;
            }
            else if (c >= t->ch[0] && c <= t->ch[1])
            {   /* transition ... */
                state = context->dfa->states[t->to];
                if (state->rule_no)
                {
                    if (c_prev == '\n')
                    {
                        last_rule = state->rule_no;
                        last_ptr = *ptr;
                    }
                    else if (state->rule_nno)
                    {
                        last_rule = state->rule_nno;
                        last_ptr = *ptr;
                    }
                    more = 1;
                }
                break;
            }
            else
                t++;
    }
    return more;
}

static data1_node *lexRoot (struct lexSpec *spec, off_t offset,
                            const char *context_name)
{
    struct lexContext *lt = spec->context;
    int ptr = offset;
    int ret;

    spec->stop_flag = 0;
    spec->d1_level = 0;
    spec->context_stack_top = 0;
    while (lt)
    {
        if (!strcmp (lt->name, context_name))
            break;
        lt = lt->next;
    }
    if (!lt)
    {
        yaz_log (YLOG_WARN, "cannot find context %s", context_name);
        return NULL;
    }
    spec->context_stack[spec->context_stack_top] = lt;
    spec->d1_stack[spec->d1_level] = NULL;
#if 1
    if (!lt->initFlag)
    {
        lt->initFlag = 1;
        execAction (spec, lt->initActionList, ptr, &ptr);
    }
#endif
    execAction (spec, lt->beginActionList, ptr, &ptr);

    ret = lexNode (spec, &ptr);
    while (spec->d1_level)
    {
        tagDataRelease (spec);
        (spec->d1_level)--;
    }
    if (!ret)
        return 0;
    execAction (spec, lt->endActionList, ptr, &ptr);
    return spec->d1_stack[0];
}

void grs_destroy(void *clientData)
{
    struct lexSpecs *specs = (struct lexSpecs *) clientData;
    if (specs->spec)
    {
        lexSpecDestroy(&specs->spec);
    }
    xfree (specs);
}

void *grs_init(Res res, RecType recType)
{
    struct lexSpecs *specs = (struct lexSpecs *) xmalloc (sizeof(*specs));
    specs->spec = 0;
    strcpy(specs->type, "");
    return specs;
}


ZEBRA_RES grs_config(void *clientData, Res res, const char *args)
{
    struct lexSpecs *specs = (struct lexSpecs *) clientData;
    if (strlen(args) < sizeof(specs->type))
        strcpy(specs->type, args);
    return ZEBRA_OK;
}

data1_node *grs_read_regx (struct grs_read_info *p)
{
    int res;
    struct lexSpecs *specs = (struct lexSpecs *) p->clientData;
    struct lexSpec **curLexSpec = &specs->spec;
    off_t start_offset;

#if REGX_DEBUG
    yaz_log (YLOG_LOG, "grs_read_regx");
#endif
    if (!*curLexSpec || strcmp ((*curLexSpec)->name, specs->type))
    {
        if (*curLexSpec)
            lexSpecDestroy (curLexSpec);
        *curLexSpec = lexSpecCreate (specs->type, p->dh);
        res = readFileSpec (*curLexSpec);
        if (res)
        {
            lexSpecDestroy (curLexSpec);
            return NULL;
        }
    }
    (*curLexSpec)->dh = p->dh;
    start_offset = p->stream->tellf(p->stream);
    if (start_offset == 0)
    {
        (*curLexSpec)->f_win_start = 0;
        (*curLexSpec)->f_win_end = 0;
        (*curLexSpec)->f_win_rf = p->stream->readf;
        (*curLexSpec)->f_win_sf = p->stream->seekf;
        (*curLexSpec)->stream = p->stream;
        (*curLexSpec)->f_win_ef = p->stream->endf;
        (*curLexSpec)->f_win_size = 500000;
    }
    (*curLexSpec)->m = p->mem;
    return lexRoot (*curLexSpec, start_offset, "main");
}

static int extract_regx(void *clientData, struct recExtractCtrl *ctrl)
{
    return zebra_grs_extract(clientData, ctrl, grs_read_regx);
}

static int retrieve_regx(void *clientData, struct recRetrieveCtrl *ctrl)
{
    return zebra_grs_retrieve(clientData, ctrl, grs_read_regx);
}

static struct recType regx_type = {
    0,
    "grs.regx",
    grs_init,
    grs_config,
    grs_destroy,
    extract_regx,
    retrieve_regx,
};


#if HAVE_TCL_H
data1_node *grs_read_tcl (struct grs_read_info *p)
{
    int res;
    struct lexSpecs *specs = (struct lexSpecs *) p->clientData;
    struct lexSpec **curLexSpec = &specs->spec;
    off_t start_offset;

#if REGX_DEBUG
    yaz_log (YLOG_LOG, "grs_read_tcl");
#endif
    if (!*curLexSpec || strcmp ((*curLexSpec)->name, specs->type))
    {
        Tcl_Interp *tcl_interp;
        if (*curLexSpec)
            lexSpecDestroy (curLexSpec);
        *curLexSpec = lexSpecCreate (specs->type, p->dh);
        Tcl_FindExecutable("");
        tcl_interp = (*curLexSpec)->tcl_interp = Tcl_CreateInterp();
        Tcl_Init(tcl_interp);
        Tcl_CreateCommand (tcl_interp, "begin", cmd_tcl_begin, *curLexSpec, 0);
        Tcl_CreateCommand (tcl_interp, "end", cmd_tcl_end, *curLexSpec, 0);
        Tcl_CreateCommand (tcl_interp, "data", cmd_tcl_data, *curLexSpec, 0);
        Tcl_CreateCommand (tcl_interp, "unread", cmd_tcl_unread,
                           *curLexSpec, 0);
        res = readFileSpec (*curLexSpec);
        if (res)
        {
            lexSpecDestroy (curLexSpec);
            return NULL;
        }
    }
    (*curLexSpec)->dh = p->dh;
    start_offset = p->stream->tellf(p->stream);
    if (start_offset == 0)
    {
        (*curLexSpec)->f_win_start = 0;
        (*curLexSpec)->f_win_end = 0;
        (*curLexSpec)->f_win_rf = p->stream->readf;
        (*curLexSpec)->f_win_sf = p->stream->seekf;
        (*curLexSpec)->stream = p->stream;
        (*curLexSpec)->f_win_ef = p->stream->endf;
        (*curLexSpec)->f_win_size = 500000;
    }
    (*curLexSpec)->m = p->mem;
    return lexRoot (*curLexSpec, start_offset, "main");
}

static int extract_tcl(void *clientData, struct recExtractCtrl *ctrl)
{
    return zebra_grs_extract(clientData, ctrl, grs_read_tcl);
}

static int retrieve_tcl(void *clientData, struct recRetrieveCtrl *ctrl)
{
    return zebra_grs_retrieve(clientData, ctrl, grs_read_tcl);
}

static struct recType tcl_type = {
    0,
    "grs.tcl",
    grs_init,
    grs_config,
    grs_destroy,
    extract_tcl,
    retrieve_tcl,
};

#endif

RecType
#if IDZEBRA_STATIC_GRS_REGX
idzebra_filter_grs_regx
#else
idzebra_filter
#endif

[] = {
    &regx_type,
#if HAVE_TCL_H
    &tcl_type,
#endif
    0,
};
/*
 * Local variables:
 * c-basic-offset: 4
 * c-file-style: "Stroustrup"
 * indent-tabs-mode: nil
 * End:
 * vim: shiftwidth=4 tabstop=8 expandtab
 */

