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/* html.c -- html-related utilities.
$Id: html.c,v 1.26 2002/03/23 20:39:49 karl Exp $
Copyright (C) 1999, 2000, 01, 02 Free Software Foundation, Inc.
This program 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.
This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "system.h"
#include "cmds.h"
#include "html.h"
#include "lang.h"
#include "makeinfo.h"
#include "sectioning.h"
/* See html.h. */
int html_output_head_p = 0;
void
html_output_head ()
{
static char *html_title = NULL;
static int html_title_written = 0;
if (html_output_head_p)
return;
html_output_head_p = 1;
/* The <title> should not have markup, so use text_expansion. */
if (!html_title)
html_title = title ? text_expansion (title) : _("Untitled");
add_word_args ("<html lang=\"%s\">\n<head>\n<title>%s</title>\n",
language_table[language_code].abbrev, html_title);
add_word ("<meta http-equiv=\"Content-Type\" content=\"text/html");
if (document_encoding_code != no_encoding)
add_word_args ("; charset=%s",
encoding_table[document_encoding_code].ecname);
add_word ("\">\n");
if (!document_description)
document_description = html_title;
add_word_args ("<meta name=description content=\"%s\">\n",
document_description);
add_word_args ("<meta name=generator content=\"makeinfo %s\">\n", VERSION);
add_word ("<link href=\"http://www.gnu.org/software/texinfo/\" rel=generator-home>\n");
if (copying_text)
{ /* copying_text has already been fully expanded in
begin_insertion (by full_expansion), so use insert_ rather than
add_. It is not ideal that we include the html markup here within
<head>, but the alternative is to have yet more and different
expansions of the copying text. Yuck. */
insert_string ("<!--\n");
insert_string (copying_text);
insert_string ("-->\n");
}
add_word ("</head>\n<body>\n");
if (title && !html_title_written)
{
add_word_args ("<h1>%s</h1>\n", html_title);
html_title_written = 1;
}
}
/* Escape HTML special characters in the string if necessary,
returning a pointer to a possibly newly-allocated one. */
char *
escape_string (string)
char * string;
{
int i=0, newlen=0;
char * newstring;
do
{
/* Find how much to allocate. */
switch (string[i])
{
case '&':
newlen += 5; /* `&' */
break;
case '<':
case '>':
newlen += 4; /* `<', `>' */
break;
default:
newlen++;
}
}
while (string[i++]);
if (newlen == i) return string; /* Already OK. */
newstring = xmalloc (newlen);
i = 0;
do
{
switch (string[i])
{
case '&':
strcpy (newstring, "&");
newstring += 5;
break;
case '<':
strcpy (newstring, "<");
newstring += 4;
break;
case '>':
strcpy (newstring, ">");
newstring += 4;
break;
default:
newstring[0] = string[i];
newstring++;
}
}
while (string[i++]);
free (string);
return newstring - newlen;
}
/* Open or close TAG according to START_OR_END. */
void
insert_html_tag (start_or_end, tag)
int start_or_end;
char *tag;
{
if (!paragraph_is_open && (start_or_end == START))
{
/* Need to compensate for the <p> we are about to insert, or
else cm_xxx functions that call us will get wrong text
between START and END. */
adjust_braces_following (output_paragraph_offset, 3);
add_word ("<p>");
}
add_char ('<');
if (start_or_end != START)
add_char ('/');
add_word (tag);
add_char ('>');
}
/* Output an HTML <link> to the filename for NODE, including the
other string as extra attributes. */
void
add_link (nodename, attributes)
char *nodename, *attributes;
{
if (nodename)
{
add_html_elt ("<link ");
add_word_args ("%s", attributes);
add_word_args (" href=\"");
add_anchor_name (nodename, 1);
add_word ("\"></a>\n");
}
}
/* Output NAME with characters escaped as appropriate for an anchor
name, i.e., escape URL special characters as %<n>. */
void
add_escaped_anchor_name (name)
char *name;
{
for (; *name; name++)
{
if (*name == '&')
add_word ("&");
else if (! URL_SAFE_CHAR (*name))
/* Cast so characters with the high bit set are treated as >128,
for example o-umlaut should be 246, not -10. */
add_word_args ("%%%x", (unsigned char) *name);
else
add_char (*name);
}
}
/* Insert the text for the name of a reference in an HTML anchor
appropriate for NODENAME. If HREF is nonzero, it will be
appropriate for a href= attribute, rather than name= i.e., including
the `#' if it's an internal reference. */
void
add_anchor_name (nodename, href)
char *nodename;
int href;
{
if (href)
{
if (splitting)
add_url_name (nodename, href);
add_char ('#');
}
/* Always add NODENAME, so that the reference would pinpoint the
exact node on its file. This is so several nodes could share the
same file, in case of file-name clashes, but also for more
accurate browser positioning. */
if (strcasecmp (nodename, "(dir)") == 0)
/* Strip the parens, but keep the original letter-case. */
add_word_args ("%.3s", nodename + 1);
else
add_escaped_anchor_name (nodename);
}
/* Insert the text for the name of a reference in an HTML url, aprropriate
for NODENAME */
void
add_url_name (nodename, href)
char *nodename;
int href;
{
add_nodename_to_filename (nodename, href);
}
/* Only allow [-0-9a-zA-Z_.] when nodifying filenames. This may
result in filename clashes; e.g.,
@node Foo ],,,
@node Foo [,,,
both map to Foo--.html. If that happens, cm_node will put all
the nodes whose file names clash on the same file. */
void
fix_filename (filename)
char *filename;
{
char *p;
for (p = filename; *p; p++)
{
if (!(isalnum (*p) || strchr ("-._", *p)))
*p = '-';
}
}
/* As we can't look-up a (forward-referenced) nodes' html filename
from the tentry, we take the easy way out. We assume that
nodenames are unique, and generate the html filename from the
nodename, that's always known. */
static char *
nodename_to_filename_1 (nodename, href)
char *nodename;
int href;
{
char *p;
char *filename;
char dirname[PATH_MAX];
if (strcasecmp (nodename, "Top") == 0)
{
/* We want to convert references to the Top node into
"index.html#Top". */
if (href)
filename = xstrdup ("index.html"); /* "#Top" is added by our callers */
else
filename = xstrdup ("Top");
}
else if (strcasecmp (nodename, "(dir)") == 0)
/* We want to convert references to the (dir) node into
"../index.html". */
filename = xstrdup ("../index.html");
else
{
filename = xmalloc (PATH_MAX);
dirname[0] = '\0';
*filename = '\0';
/* Check for external reference: ``(info-document)node-name''
Assume this node lives at: ``../info-document/node-name.html''
We need to handle the special case (sigh): ``(info-document)'',
ie, an external top-node, which should translate to:
``../info-document/info-document.html'' */
p = nodename;
if (*nodename == '(')
{
int length;
p = strchr (nodename, ')');
if (p == NULL)
{
line_error (_("Invalid node name: `%s'"), nodename);
exit (1);
}
length = p - nodename - 1;
if (length > 5 &&
FILENAME_CMPN (p - 5, ".info", 5) == 0)
length -= 5;
/* This is for DOS, and also for Windows and GNU/Linux
systems that might have Info files copied from a DOS 8+3
filesystem. */
if (length > 4 &&
FILENAME_CMPN (p - 4, ".inf", 4) == 0)
length -= 4;
strcpy (filename, "../");
strncpy (dirname, nodename + 1, length);
*(dirname + length) = '\0';
fix_filename (dirname);
strcat (filename, dirname);
strcat (filename, "/");
p++;
}
/* In the case of just (info-document), there will be nothing
remaining, and we will refer to ../info-document/, which will
work fine. */
strcat (filename, p);
if (*p)
{
/* Hmm */
fix_filename (filename + strlen (filename) - strlen (p));
strcat (filename, ".html");
}
}
/* Produce a file name suitable for the underlying filesystem. */
normalize_filename (filename);
#if 0
/* We add ``#Nodified-filename'' anchor to external references to be
prepared for non-split HTML support. Maybe drop this. */
if (href && *dirname)
{
strcat (filename, "#");
strcat (filename, p);
/* Hmm, again */
fix_filename (filename + strlen (filename) - strlen (p));
}
#endif
return filename;
}
/* If necessary, ie, if current filename != filename of node, output
the node name. */
void
add_nodename_to_filename (nodename, href)
char *nodename;
int href;
{
/* for now, don't check: always output filename */
char *filename = nodename_to_filename_1 (nodename, href);
add_word (filename);
free (filename);
}
char *
nodename_to_filename (nodename)
char *nodename;
{
/* The callers of nodename_to_filename use the result to produce
<a href=, so call nodename_to_filename_1 with last arg non-zero. */
return nodename_to_filename_1 (nodename, 1);
}
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