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/* html.c -- html-related utilities.
$Id: html.c,v 1.18 2003/06/02 12:32:29 karl Exp $
Copyright (C) 1999, 2000, 2001, 2002, 2003 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"
HSTACK *htmlstack = NULL;
static char *process_css_file (/* char * */);
/* See html.h. */
int html_output_head_p = 0;
int html_title_written = 0;
void
html_output_head ()
{
static const char *html_title = NULL;
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].encname);
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);
#if 0
/* let's not do this now, since it causes mozilla to put up a
navigation bar. */
add_word ("<link href=\"http://www.gnu.org/software/texinfo/\" \
rel=\"generator-home\">\n");
#endif
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");
}
/* Put the style definitions in a comment for the sake of browsers
that don't support <style>. */
add_word ("<meta http-equiv=\"Content-Style-Type\" content=\"text/css\">\n");
add_word ("<style type=\"text/css\"><!--\n");
{
char *css_inline = NULL;
if (css_include)
/* This writes out any @import commands from the --css-file,
and returns any actual css code following the imports. */
css_inline = process_css_file (css_include);
/* This seems cleaner than adding <br>'s at the end of each line for
these "roman" displays. It's hardly the end of the world if the
browser doesn't do <style>s, in any case; they'll just come out in
typewriter. */
#define CSS_FONT_INHERIT "font-family:inherit"
add_word_args (" pre.display { %s }\n", CSS_FONT_INHERIT);
add_word_args (" pre.format { %s }\n", CSS_FONT_INHERIT);
/* Alternatively, we could do <font size=-1> in insertion.c, but this
way makes it easier to override. */
#define CSS_FONT_SMALLER "font-size:smaller"
add_word_args (" pre.smalldisplay { %s; %s }\n", CSS_FONT_INHERIT,
CSS_FONT_SMALLER);
add_word_args (" pre.smallformat { %s; %s }\n", CSS_FONT_INHERIT,
CSS_FONT_SMALLER);
add_word_args (" pre.smallexample { %s }\n", CSS_FONT_SMALLER);
add_word_args (" pre.smalllisp { %s }\n", CSS_FONT_SMALLER);
/* Write out any css code from the user's --css-file. */
if (css_inline)
add_word (css_inline);
add_word ("--></style>\n");
}
add_word ("</head>\n<body>\n");
if (title && !html_title_written && titlepage_cmd_present)
{
add_word_args ("<h1 class=\"settitle\">%s</h1>\n", html_title);
html_title_written = 1;
}
}
/* Append CHAR to BUFFER, (re)allocating as necessary. We don't handle
null characters. */
typedef struct
{
unsigned size; /* allocated */
unsigned length; /* used */
char *buffer;
} buffer_type;
static buffer_type *
init_buffer ()
{
buffer_type *buf = xmalloc (sizeof (buffer_type));
buf->length = 0;
buf->size = 0;
buf->buffer = NULL;
return buf;
}
static void
append_char (buf, c)
buffer_type *buf;
int c;
{
buf->length++;
if (buf->length >= buf->size)
{
buf->size += 100;
buf->buffer = xrealloc (buf->buffer, buf->size);
}
buf->buffer[buf->length - 1] = c;
buf->buffer[buf->length] = 0;
}
/* Read the cascading style-sheet file FILENAME. Write out any @import
commands, which must come first, by the definition of css. If the
file contains any actual css code following the @imports, return it;
else return NULL. */
static char *
process_css_file (filename)
char *filename;
{
int c, lastchar;
FILE *f;
buffer_type *import_text = init_buffer ();
buffer_type *inline_text = init_buffer ();
unsigned lineno = 1;
enum { null_state, comment_state, import_state, inline_state } state
= null_state, prev_state;
/* read from stdin if `-' is the filename. */
f = STREQ (filename, "-") ? stdin : fopen (filename, "r");
if (!f)
{
error (_("%s: could not open --css-file: %s"), progname, filename);
return NULL;
}
/* Read the file. The @import statements must come at the beginning,
with only whitespace and comments allowed before any inline css code. */
while ((c = getc (f)) >= 0)
{
if (c == '\n')
lineno++;
switch (state)
{
case null_state: /* between things */
if (c == '@')
{
/* If there's some other @command, just call it an
import, it's all the same to us. So don't bother
looking for the `import'. */
append_char (import_text, c);
state = import_state;
}
else if (c == '/')
{ /* possible start of a comment */
int nextchar = getc (f);
if (nextchar == '*')
state = comment_state;
else
{
ungetc (nextchar, f); /* wasn't a comment */
state = inline_state;
}
}
else if (isspace (c))
; /* skip whitespace; maybe should use c_isspace? */
else
/* not an @import, not a comment, not whitespace: we must
have started the inline text. */
state = inline_state;
if (state == inline_state)
append_char (inline_text, c);
if (state != null_state)
prev_state = null_state;
break;
case comment_state:
if (c == '/' && lastchar == '*')
state = prev_state; /* end of comment */
break; /* else ignore this comment char */
case import_state:
append_char (import_text, c); /* include this import char */
if (c == ';')
{ /* done with @import */
append_char (import_text, '\n'); /* make the output nice */
state = null_state;
prev_state = import_state;
}
break;
case inline_state:
/* No harm in writing out comments, so don't bother parsing
them out, just append everything. */
append_char (inline_text, c);
break;
}
lastchar = c;
}
/* Reached the end of the file. We should not be still in a comment. */
if (state == comment_state)
warning (_("%s:%d: --css-file ended in comment"), filename, lineno);
/* Write the @import text, if any. */
if (import_text->buffer)
{
add_word (import_text->buffer);
free (import_text->buffer);
free (import_text);
}
/* We're wasting the buffer struct memory, but so what. */
return inline_text->buffer;
}
/* 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;
}
/* Save current tag. */
void
push_tag (tag)
char *tag;
{
HSTACK *newstack = xmalloc (sizeof (HSTACK));
newstack->tag = tag;
newstack->next = htmlstack;
htmlstack = newstack;
}
/* Get last tag. */
void
pop_tag ()
{
HSTACK *tos = htmlstack;
if (!tos)
{
line_error (_("[unexpected] no html tag to pop"));
return;
}
htmlstack = htmlstack->next;
free (tos);
}
/* Open or close TAG according to START_OR_END. */
void
insert_html_tag (start_or_end, tag)
int start_or_end;
char *tag;
{
char *old_tag = NULL;
int do_return = 0;
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>");
}
if (start_or_end != START)
pop_tag ();
if (htmlstack)
old_tag = htmlstack->tag;
if (htmlstack
&& (strcmp (htmlstack->tag, tag) == 0))
do_return = 1;
if (start_or_end == START)
push_tag (tag);
if (do_return)
return;
/* texinfo.tex doesn't support more than one font attribute
at the same time. */
if ((start_or_end == START) && old_tag && *old_tag)
{
add_word ("</");
add_word (old_tag);
add_char ('>');
}
if (*tag)
{
add_char ('<');
if (start_or_end != START)
add_char ('/');
add_word (tag);
add_char ('>');
}
if ((start_or_end != START) && old_tag && *old_tag)
{
add_char ('<');
add_word (old_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 ("\">\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 (_("[unexpected] invalid node name: `%s'"), nodename);
xexit (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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