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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by Gaius Mulley (gaius@glam.ac.uk)
This file is part of groff.
groff 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.
groff 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 groff; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "nonposix.h"
#include "stringclass.h"
/*
* this file contains a very simple set of routines shared by
* tbl, pic, eqn which help the html device driver to make
* sensible formatting choices. Currently it simply indicates
* when a region of gyphs should be rendered as an image rather
* than html. In the future it should be expanded so to enable:
*
* tbl to inform grohtml about table widths.
* troff to inform grohtml about tab positions and whether
* we are entering two/three column mode.
*/
static int is_in_graphic_start = 0;
/*
* html_begin_suppress - if the 'htmlflip' variable is set to 1 then
* all text following this line will be suppressed by troff
* and if the -Thtml2 device is specified a generic IMAGE tag
* is emitted which is later filled in by the pre-html preprocessor.
*/
void html_begin_suppress (void)
{
/*
* the pre-html processor looks for <pre-html-image> and replaces it
* with a sensible name
*/
put_string(".if r html2enable .if '\\*(.T'html2' .IMAGE <pre-html-image>\n", stdout);
#if 1
// debugging information
put_string(".if r html2enable .if !r htmlflip .tm \"htmlflip was not set?\"\n", stdout);
#endif
put_string(".if r html2enable .if r htmlflip .output 1-\\n[htmlflip]\n", stdout);
}
/*
* html_end_suppress - if the 'htmlflip' variable is 1 then
* enable generation of text after this line of troff.
* If 'htmlflip' and -Thtml2 is set then issue the
* upper x,y and lower x,y coordinates to stderr via
* a troff '.tm' command.
*/
void html_end_suppress (void)
{
put_string(".if r html2enable .if r htmlflip .if !'\\*(.T'html2' .tm grohtml-info:page \\n% \\n[opminx] \\n[opminy] \\n[opmaxx] \\n[opmaxy] \\n[.H] \\n[.V] \\n[.F]\n",
stdout);
put_string(".if r html2enable .if r htmlflip .output \\n[htmlflip]\n", stdout);
}
/*
* graphic_start - emit a html graphic start indicator, but only
* if one has not already been issued.
*/
void graphic_start (void)
{
if (! is_in_graphic_start) {
put_string(".if '\\*(.T'html' \\X(graphic-start(\\c\n", stdout);
html_begin_suppress();
is_in_graphic_start = 1;
}
}
/*
* graphic_end - emit a html graphic end indicator, but only
* if a corresponding matching graphic-start has
* been issued.
*/
void graphic_end (void)
{
if (is_in_graphic_start) {
put_string(".if '\\*(.T'html' \\X(graphic-end(\\c\n", stdout);
html_end_suppress();
is_in_graphic_start = 0;
}
}
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