/*
 *
 *  This file is part of
 *	MakeIndex - A formatter and format independent index processor
 *
 *  Copyright (C) 1989 by Chen & Harrison International Systems, Inc.
 *  Copyright (C) 1988 by Olivetti Research Center
 *  Copyright (C) 1987 by Regents of the University of California
 *
 *  Author:
 *	Pehong Chen
 *	Chen & Harrison International Systems, Inc.
 *	Palo Alto, California
 *	USA
 *	(phc@renoir.berkeley.edu or chen@orc.olivetti.com)
 *
 *  Contributors:
 *	Please refer to the CONTRIB file that comes with this release
 *	for a list of people who have contributed to this and/or previous
 *	release(s) of MakeIndex.
 *
 *  All rights reserved by the copyright holders.  See the copyright
 *  notice distributed with this software for a complete description of
 *  the conditions under which it is made available.
 *
 */

#include    "mkind.h"
#include    "genind.h"

static FIELD_PTR curr = NULL;
static FIELD_PTR prev = NULL;
static FIELD_PTR begin = NULL;
static FIELD_PTR the_end = NULL;
static FIELD_PTR range_ptr;
static int level = 0;
static int prev_level = 0;
static char *encap = NULL;
static char *prev_encap = NULL;
static int in_range = FALSE;
static int encap_range = FALSE;
static char buff[2 * ARGUMENT_MAX];
static char line[2 * ARGUMENT_MAX];	/* output buffer */
static int ind_lc = 0;			/* overall line count */
static int ind_ec = 0;			/* erroneous line count */
static int ind_indent;

static	void	flush_line ARGS((int print));
static	void	insert_page ARGS((void));
static	int	make_entry ARGS((int n));
static	void	make_item ARGS((char* term));
static  unsigned char first_letter ARGS((char* term));
static	void	new_entry ARGS((void));
static	void	old_entry ARGS((void));
static	int	page_diff ARGS((struct KFIELD *a,struct KFIELD *b));
static	void	put_header ARGS((int let));
static	void	wrap_line ARGS((int print));

void
gen_ind(VOID_ARG)
{
    int     n;
    int     tmp_lc;

    MESSAGE("Generating output file %s...", ind_fn);
    PUT(preamble);
    ind_lc += prelen;
    if (init_page)
	insert_page();

    /* reset counters for putting out dots */
    idx_dc = 0;
    for (n = 0; n < idx_gt; n++) {
	if (idx_key[n]->type != DUPLICATE)
	    if (make_entry(n)) {
		IDX_DOT(DOT_MAX);
	    }
    }
    tmp_lc = ind_lc;
    if (in_range) {
	curr = range_ptr;
	IND_ERROR("Unmatched range opening operator %c.\n", idx_ropen);
    }
    prev = curr;
    flush_line(TRUE);
    PUT(delim_t);
    PUT(postamble);
    tmp_lc = ind_lc + postlen;
    if (ind_ec == 1) {
	DONE(tmp_lc, "lines written", ind_ec, "warning");
    } else {
	DONE(tmp_lc, "lines written", ind_ec, "warnings");
    }
}


static int
#if STDC
make_entry(int n)
#else
make_entry(n)
int     n;
#endif
{
    int     let;

    /* determine current and previous pointer */
    prev = curr;
    curr = idx_key[n];
    /* check if current entry is in range */
    if ((*curr->encap == idx_ropen) || (*curr->encap == idx_rclose))
	encap = &(curr->encap[1]);
    else
	encap = curr->encap;

    /* determine the current nesting level */
    if (n == 0) {
	prev_level = level = 0;
	let = *curr->sf[0];
	put_header(let);
	make_item(NIL);
    } else {
	prev_level = level;
	for (level = 0; level < FIELD_MAX; level++)
	    if (STRNEQ(curr->sf[level], prev->sf[level]) ||
		STRNEQ(curr->af[level], prev->af[level]))
		break;
	if (level < FIELD_MAX)
	    new_entry();
	else
	    old_entry();
    }

    if (*curr->encap == idx_ropen)
	if (in_range) {
	    IND_ERROR("Extra range opening operator %c.\n", idx_ropen);
	} else {
	    in_range = TRUE;
	    range_ptr = curr;
	}
    else if (*curr->encap == idx_rclose)
	if (in_range) {
	    in_range = FALSE;
	    if (STRNEQ(&(curr->encap[1]), "") &&
		STRNEQ(prev_encap, &(curr->encap[1]))) {
IND_ERROR("Range closing operator has an inconsistent encapsulator %s.\n",
			  &(curr->encap[1]));
	    }
	} else {
	    IND_ERROR("Unmatched range closing operator %c.\n", idx_rclose);
	}
    else if ((*curr->encap != NUL) &&
	     STRNEQ(curr->encap, prev_encap) && in_range)
	IND_ERROR("Inconsistent page encapsulator %s within range.\n",
		  curr->encap);
    return (1);
}


static void
#if STDC
make_item(char *term)
#else
make_item(term)
char   *term;
#endif
{
    int     i;

    if (level > prev_level) {
	/* ascending level */
	if (*curr->af[level] == NUL)
	    sprintf(line, "%s%s%s", term, item_u[level], curr->sf[level]);
	else
	    sprintf(line, "%s%s%s", term, item_u[level], curr->af[level]);
	ind_lc += ilen_u[level];
    } else {
	/* same or descending level */
	if (*curr->af[level] == NUL)
	    sprintf(line, "%s%s%s", term, item_r[level], curr->sf[level]);
	else
	    sprintf(line, "%s%s%s", term, item_r[level], curr->af[level]);
	ind_lc += ilen_r[level];
    }

    i = level + 1;
    while (i < FIELD_MAX && *curr->sf[i] != NUL) {
	PUT(line);
	if (*curr->af[i] == NUL)
	    sprintf(line, "%s%s", item_x[i], curr->sf[i]);
	else
	    sprintf(line, "%s%s", item_x[i], curr->af[i]);
	ind_lc += ilen_x[i];
	level = i;		/* Added at 2.11 <brosig@gmdzi.gmd.de> */
	i++;
    }

    ind_indent = 0;
    strcat(line, delim_p[level]);
    SAVE;
}

static unsigned char
#if STDC
first_letter(char *term)
#else
first_letter(term)
char   *term;
#endif
{
    if (thai_sort)
        return strchr("אבגדה", term[0]) ? term[1] : term[0];

    return TOLOWER(term[0]);
}

static void
new_entry(VOID_ARG)
{
    int    let;
    FIELD_PTR ptr;

    if (in_range) {
	ptr = curr;
	curr = range_ptr;
	IND_ERROR("Unmatched range opening operator %c.\n", idx_ropen);
	in_range = FALSE;
	curr = ptr;
    }
    flush_line(TRUE);

    /* beginning of a new group? */

    if (((curr->group != ALPHA) && (curr->group != prev->group) &&
	 (prev->group == SYMBOL)) ||
	((curr->group == ALPHA) &&
	 ((unsigned char)(let = first_letter(curr->sf[0])) 
	  != first_letter(prev->sf[0]))) ||
	(german_sort &&
	 (curr->group != ALPHA) && (prev->group == ALPHA))) {
	PUT(delim_t);
	PUT(group_skip);
	ind_lc += skiplen;
	/* beginning of a new letter? */
	put_header(let);
	make_item(NIL);
    } else
	make_item(delim_t);
}


static void
old_entry(VOID_ARG)
{
    int     diff;

    /* current entry identical to previous one: append pages */
    diff = page_diff(the_end, curr);

    if ((prev->type == curr->type) && (diff != -1) &&
	(((diff == 0) && (prev_encap != NULL) && STREQ(encap, prev_encap)) ||
	 (merge_page && (diff == 1) &&
	  (prev_encap != NULL) && STREQ(encap, prev_encap)) ||
	 in_range)) {
	the_end = curr;
	/* extract in-range encaps out */
	if (in_range &&
	    (*curr->encap != NUL) &&
	    (*curr->encap != idx_rclose) &&
	    STRNEQ(curr->encap, prev_encap)) {
	    sprintf(buff, "%s%s%s%s%s", encap_p, curr->encap,
		    encap_i, curr->lpg, encap_s);
	    wrap_line(FALSE);
	}
	if (in_range)
	    encap_range = TRUE;
    } else {
	flush_line(FALSE);
	if ((diff == 0) && (prev->type == curr->type)) {
IND_ERROR(
"Conflicting entries: multiple encaps for the same page under same key.\n",
"");
	} else if (in_range && (prev->type != curr->type)) {
IND_ERROR(
"Illegal range formation: starting & ending pages are of different types.\n",
"");
	} else if (in_range && (diff == -1)) {
IND_ERROR(
"Illegal range formation: starting & ending pages cross chap/sec breaks.\n",
"");
	}
	SAVE;
    }
}


static int
#if STDC
page_diff(FIELD_PTR a,FIELD_PTR b)
#else
page_diff(a, b)
FIELD_PTR a;
FIELD_PTR b;
#endif
{
    short   i;

    if (a->count != b->count)
	return (-1);
    for (i = 0; i < a->count - 1; i++)
	if (a->npg[i] != b->npg[i])
	    return (-1);
    return (b->npg[b->count - 1] - a->npg[a->count - 1]);
}

static void
#if STDC
put_header(int let)
#else
put_header(let)
int	let;
#endif
{
    if (headings_flag)
    {
	PUT(heading_pre);
	ind_lc += headprelen;
	switch (curr->group)
	{
	case SYMBOL:
	    if (headings_flag > 0)
	    {
		PUT(symhead_pos);
	    }
	    else
	    {
		PUT(symhead_neg);
	    }
	    break;
	case ALPHA:
	    if (headings_flag > 0)
	    {
		let = TOUPPER(let);
		PUTC(let);
	    }
	    else
	    {
		let = TOLOWER(let);
		PUTC(let);
	    }
	    break;
	default:
	    if (headings_flag > 0)
	    {
		PUT(numhead_pos);
	    }
	    else
	    {
		PUT(numhead_neg);
	    }
	    break;
	}
	PUT(heading_suf);
	ind_lc += headsuflen;
    }
}


/* changes for 2.12 (May 20, 1993) by Julian Reschke (jr@ms.maus.de):
   Use keywords suffix_2p, suffix_3p or suffix_mp for one, two or
   multiple page ranges (when defined) */

static void
#if STDC
flush_line(int print)
#else
flush_line(print)
int     print;
#endif
{
    char    tmp[sizeof(buff)];

    if (page_diff(begin, the_end) != 0)
	if (encap_range || (page_diff(begin, prev) > (*suffix_2p ? 0 : 1)))
	{
		int diff = page_diff(begin, the_end);
		
		if ((diff == 1) && *suffix_2p)
		    sprintf(buff, "%s%s", begin->lpg, suffix_2p);
		else if ((diff == 2) && *suffix_3p)
		    sprintf(buff, "%s%s", begin->lpg, suffix_3p);
		else if ((diff >= 2) && *suffix_mp)
		    sprintf(buff, "%s%s", begin->lpg, suffix_mp);
		else
		    sprintf(buff, "%s%s%s", begin->lpg, delim_r, the_end->lpg);

	    encap_range = FALSE;
	}
	else
	   	sprintf(buff, "%s%s%s", begin->lpg, delim_n, the_end->lpg);
    else
    {
	encap_range = FALSE; /* might be true from page range on same page */
	strcpy(buff, begin->lpg);
    }

    if (*prev_encap != NUL)
    {
	strcpy(tmp, buff);
	sprintf(buff, "%s%s%s%s%s",
		encap_p, prev_encap, encap_i, tmp, encap_s);
    }
    wrap_line(print);
}

static void
#if STDC
wrap_line(int print)
#else
wrap_line(print)
int     print;
#endif
{
    int     len;

    len = strlen(line) + strlen(buff) + ind_indent;
    if (print) {
	if (len > linemax) {
	    PUTLN(line);
	    PUT(indent_space);
	    ind_indent = indent_length;
	} else
	    PUT(line);
	PUT(buff);
    } else {
	if (len > linemax) {
	    PUTLN(line);
	    sprintf(line, "%s%s%s", indent_space, buff, delim_n);
	    ind_indent = indent_length;
	} else {
	    strcat(buff, delim_n);
	    strcat(line, buff);
	}
    }
}


static void
insert_page(VOID_ARG)
{
    int     i = 0;
    int     j = 0;
    int     page = 0;

    if (even_odd >= 0) {
	/* find the rightmost digit */
	while (pageno[i++] != NUL);
	j = --i;
	/* find the leftmost digit */
	while (isdigit(pageno[--i]) && i > 0);
	if (!isdigit(pageno[i]))
	    i++;
	/* convert page from literal to numeric */
	page = strtoint(&pageno[i]) + 1;
	/* check even-odd numbering */
	if (((even_odd == 1) && (page % 2 == 0)) ||
	    ((even_odd == 2) && (page % 2 == 1)))
	    page++;
	pageno[j + 1] = NUL;
	/* convert page back to literal */
	while (page >= 10) {
	    pageno[j--] = TOASCII(page % 10);
	    page = page / 10;
	}
	pageno[j] = TOASCII(page);
	if (i < j) {
	    while (pageno[j] != NUL)
		pageno[i++] = pageno[j++];
	    pageno[i] = NUL;
	}
    }
    PUT(setpage_open);
    PUT(pageno);
    PUT(setpage_close);
    ind_lc += setpagelen;
}
