/*      Id: tbl_data.c,v 1.59 2021/09/10 13:24:38 schwarze Exp  */
/*
* Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <[email protected]>
* Copyright (c) 2011,2015,2017-2019,2021 Ingo Schwarze <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "tbl.h"
#include "libmandoc.h"
#include "tbl_int.h"

static  void             getdata(struct tbl_node *, struct tbl_span *,
                               int, const char *, int *);
static  struct tbl_span *newspan(struct tbl_node *, int,
                               struct tbl_row *);


static void
getdata(struct tbl_node *tbl, struct tbl_span *dp,
               int ln, const char *p, int *pos)
{
       struct tbl_dat  *dat, *pdat;
       struct tbl_cell *cp;
       struct tbl_span *pdp;
       const char      *ccp;
       int              startpos, endpos;

       /*
        * Determine the length of the string in the cell
        * and advance the parse point to the end of the cell.
        */

       startpos = *pos;
       ccp = p + startpos;
       while (*ccp != '\0' && *ccp != tbl->opts.tab)
               if (*ccp++ == '\\')
                       mandoc_escape(&ccp, NULL, NULL);
       *pos = ccp - p;

       /* Advance to the next layout cell, skipping spanners. */

       cp = dp->last == NULL ? dp->layout->first : dp->last->layout->next;
       while (cp != NULL && cp->pos == TBL_CELL_SPAN)
               cp = cp->next;

       /*
        * If the current layout row is out of cells, allocate
        * a new cell if another row of the table has at least
        * this number of columns, or discard the input if we
        * are beyond the last column of the table as a whole.
        */

       if (cp == NULL) {
               if (dp->layout->last->col + 1 < dp->opts->cols) {
                       cp = mandoc_calloc(1, sizeof(*cp));
                       cp->pos = TBL_CELL_LEFT;
                       cp->font = ESCAPE_FONTROMAN;
                       cp->spacing = SIZE_MAX;
                       dp->layout->last->next = cp;
                       cp->col = dp->layout->last->col + 1;
                       dp->layout->last = cp;
               } else {
                       mandoc_msg(MANDOCERR_TBLDATA_EXTRA,
                           ln, startpos, "%s", p + startpos);
                       while (p[*pos] != '\0')
                               (*pos)++;
                       return;
               }
       }

       dat = mandoc_malloc(sizeof(*dat));
       dat->layout = cp;
       dat->next = NULL;
       dat->string = NULL;
       dat->hspans = 0;
       dat->vspans = 0;
       dat->block = 0;
       dat->pos = TBL_DATA_NONE;

       /*
        * Increment the number of vertical spans in a data cell above,
        * if this cell vertically extends one or more cells above.
        * The iteration must be done over data rows,
        * not over layout rows, because one layout row
        * can be reused for more than one data row.
        */

       if (cp->pos == TBL_CELL_DOWN ||
           (*pos - startpos == 2 &&
            p[startpos] == '\\' && p[startpos + 1] == '^')) {
               pdp = dp;
               while ((pdp = pdp->prev) != NULL) {
                       pdat = pdp->first;
                       while (pdat != NULL &&
                           pdat->layout->col < dat->layout->col)
                               pdat = pdat->next;
                       if (pdat == NULL)
                               break;
                       if (pdat->layout->pos != TBL_CELL_DOWN &&
                           strcmp(pdat->string, "\\^") != 0) {
                               pdat->vspans++;
                               break;
                       }
               }
       }

       /*
        * Count the number of horizontal spans to the right of this cell.
        * This is purely a matter of the layout, independent of the data.
        */

       for (cp = cp->next; cp != NULL; cp = cp->next)
               if (cp->pos == TBL_CELL_SPAN)
                       dat->hspans++;
               else
                       break;

       /* Append the new data cell to the data row. */

       if (dp->last == NULL)
               dp->first = dat;
       else
               dp->last->next = dat;
       dp->last = dat;

       /* Strip leading and trailing spaces, if requested. */

       endpos = *pos;
       if (dp->opts->opts & TBL_OPT_NOSPACE) {
               while (p[startpos] == ' ')
                       startpos++;
               while (endpos > startpos && p[endpos - 1] == ' ')
                       endpos--;
       }

       /*
        * Check for a continued-data scope opening.  This consists of a
        * trailing `T{' at the end of the line.  Subsequent lines,
        * until a standalone `T}', are included in our cell.
        */

       if (endpos - startpos == 2 &&
           p[startpos] == 'T' && p[startpos + 1] == '{') {
               tbl->part = TBL_PART_CDATA;
               return;
       }

       dat->string = mandoc_strndup(p + startpos, endpos - startpos);

       if (p[*pos] != '\0')
               (*pos)++;

       if ( ! strcmp(dat->string, "_"))
               dat->pos = TBL_DATA_HORIZ;
       else if ( ! strcmp(dat->string, "="))
               dat->pos = TBL_DATA_DHORIZ;
       else if ( ! strcmp(dat->string, "\\_"))
               dat->pos = TBL_DATA_NHORIZ;
       else if ( ! strcmp(dat->string, "\\="))
               dat->pos = TBL_DATA_NDHORIZ;
       else
               dat->pos = TBL_DATA_DATA;

       if ((dat->layout->pos == TBL_CELL_HORIZ ||
           dat->layout->pos == TBL_CELL_DHORIZ ||
           dat->layout->pos == TBL_CELL_DOWN) &&
           dat->pos == TBL_DATA_DATA && *dat->string != '\0')
               mandoc_msg(MANDOCERR_TBLDATA_SPAN,
                   ln, startpos, "%s", dat->string);
}

void
tbl_cdata(struct tbl_node *tbl, int ln, const char *p, int pos)
{
       struct tbl_dat  *dat;
       size_t           sz;

       dat = tbl->last_span->last;

       if (p[pos] == 'T' && p[pos + 1] == '}') {
               pos += 2;
               if (tbl->opts.opts & TBL_OPT_NOSPACE)
                       while (p[pos] == ' ')
                               pos++;
               if (p[pos] == tbl->opts.tab) {
                       tbl->part = TBL_PART_DATA;
                       pos++;
                       while (p[pos] != '\0')
                               getdata(tbl, tbl->last_span, ln, p, &pos);
                       return;
               } else if (p[pos] == '\0') {
                       tbl->part = TBL_PART_DATA;
                       return;
               }

               /* Fallthrough: T} is part of a word. */
       }

       dat->pos = TBL_DATA_DATA;
       dat->block = 1;

       if (dat->string != NULL) {
               sz = strlen(p + pos) + strlen(dat->string) + 2;
               dat->string = mandoc_realloc(dat->string, sz);
               (void)strlcat(dat->string, " ", sz);
               (void)strlcat(dat->string, p + pos, sz);
       } else
               dat->string = mandoc_strdup(p + pos);

       if (dat->layout->pos == TBL_CELL_DOWN)
               mandoc_msg(MANDOCERR_TBLDATA_SPAN,
                   ln, pos, "%s", dat->string);
}

static struct tbl_span *
newspan(struct tbl_node *tbl, int line, struct tbl_row *rp)
{
       struct tbl_span *dp;

       dp = mandoc_calloc(1, sizeof(*dp));
       dp->line = line;
       dp->opts = &tbl->opts;
       dp->layout = rp;
       dp->prev = tbl->last_span;

       if (dp->prev == NULL) {
               tbl->first_span = dp;
               tbl->current_span = NULL;
       } else
               dp->prev->next = dp;
       tbl->last_span = dp;

       return dp;
}

void
tbl_data(struct tbl_node *tbl, int ln, const char *p, int pos)
{
       struct tbl_row  *rp;
       struct tbl_cell *cp;
       struct tbl_span *sp;

       for (sp = tbl->last_span; sp != NULL; sp = sp->prev)
               if (sp->pos == TBL_SPAN_DATA)
                       break;
       rp = sp == NULL ? tbl->first_row :
           sp->layout->next == NULL ? sp->layout : sp->layout->next;
       assert(rp != NULL);

       if (p[1] == '\0') {
               switch (p[0]) {
               case '.':
                       /*
                        * Empty request lines must be handled here
                        * and cannot be discarded in roff_parseln()
                        * because in the layout section, they
                        * are significant and end the layout.
                        */
                       return;
               case '_':
                       sp = newspan(tbl, ln, rp);
                       sp->pos = TBL_SPAN_HORIZ;
                       return;
               case '=':
                       sp = newspan(tbl, ln, rp);
                       sp->pos = TBL_SPAN_DHORIZ;
                       return;
               default:
                       break;
               }
       }

       /*
        * If the layout row contains nothing but horizontal lines,
        * allocate an empty span for it and assign the current span
        * to the next layout row accepting data.
        */

       while (rp->next != NULL) {
               if (rp->last->col + 1 < tbl->opts.cols)
                       break;
               for (cp = rp->first; cp != NULL; cp = cp->next)
                       if (cp->pos != TBL_CELL_HORIZ &&
                           cp->pos != TBL_CELL_DHORIZ)
                               break;
               if (cp != NULL)
                       break;
               sp = newspan(tbl, ln, rp);
               sp->pos = TBL_SPAN_DATA;
               rp = rp->next;
       }

       /* Process a real data row. */

       sp = newspan(tbl, ln, rp);
       sp->pos = TBL_SPAN_DATA;
       while (p[pos] != '\0')
               getdata(tbl, sp, ln, p, &pos);
}

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