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Blame gettext-tools/gnulib-lib/html-styled-ostream.oo.c

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  1.   06c83544b6a8c2c757e0fcf03a7259e5fc9c4da5
  2.   gettext-tools
  3.   gnulib-lib
  4.   html-styled-ostream.oo.c
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/* Output stream for CSS styled text, producing HTML output.
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   Copyright (C) 2006-2007, 2015 Free Software Foundation, Inc.
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   Written by Bruno Haible <bruno@clisp.org>, 2006.
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   This program is free software: you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
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/* Specification.  */
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#include "html-styled-ostream.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "html-ostream.h"
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#include "binary-io.h"
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#ifndef O_TEXT
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# define O_TEXT 0
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#endif
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#include "error.h"
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#include "safe-read.h"
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#include "xalloc.h"
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#include "gettext.h"
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#define _(str) gettext (str)
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struct html_styled_ostream : struct styled_ostream
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{
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fields:
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  /* The destination stream.  */
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  ostream_t destination;
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  /* A HTML aware wrapper around the destination stream.  */
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  html_ostream_t html_destination;
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};
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/* Implementation of ostream_t methods.  */
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static void
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html_styled_ostream::write_mem (html_styled_ostream_t stream,
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                                const void *data, size_t len)
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{
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  html_ostream_write_mem (stream->html_destination, data, len);
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}
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static void
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html_styled_ostream::flush (html_styled_ostream_t stream)
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{
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  html_ostream_flush (stream->html_destination);
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}
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static void
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html_styled_ostream::free (html_styled_ostream_t stream)
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{
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  html_ostream_free (stream->html_destination);
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  ostream_write_str (stream->destination, "</body>\n");
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  ostream_write_str (stream->destination, "</html>\n");
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}
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/* Implementation of styled_ostream_t methods.  */
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static void
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html_styled_ostream::begin_use_class (html_styled_ostream_t stream,
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                                      const char *classname)
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{
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  html_ostream_begin_span (stream->html_destination, classname);
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}
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static void
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html_styled_ostream::end_use_class (html_styled_ostream_t stream,
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                                    const char *classname)
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{
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  html_ostream_end_span (stream->html_destination, classname);
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}
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/* Constructor.  */
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html_styled_ostream_t
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html_styled_ostream_create (ostream_t destination, const char *css_filename)
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{
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  html_styled_ostream_t stream =
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    XMALLOC (struct html_styled_ostream_representation);
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  stream->base.base.vtable = &html_styled_ostream_vtable;
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  stream->destination = destination;
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  stream->html_destination = html_ostream_create (destination);
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  ostream_write_str (stream->destination, "\n");
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  /* HTML 4.01 or XHTML 1.0?
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     Use HTML 4.01.  This is conservative.  Before switching to XHTML 1.0,
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     verify that in the output
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       - all HTML element names are in lowercase,
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       - all empty elements are denoted like 
 or 
,
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       - every attribute specification is in assignment form, like
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         ,
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       - every  element also has an 'id' attribute,
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       - special characters like < > & " are escaped in the <style> and
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         <script> elements.  */
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  ostream_write_str (stream->destination,
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                     "\n");
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  ostream_write_str (stream->destination, "<html>\n");
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  ostream_write_str (stream->destination, "<head>\n");
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  if (css_filename != NULL)
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    {
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      ostream_write_str (stream->destination, "<style type=\"text/css\">\n"
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                                              "
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      /* Include the contents of CSS_FILENAME literally.  */
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      {
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        int fd;
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        char buf[4096];
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        fd = open (css_filename, O_RDONLY | O_TEXT);
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        if (fd < 0)
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          error (EXIT_FAILURE, errno,
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                 _("error while opening \"%s\" for reading"),
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                 css_filename);
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        for (;;)
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          {
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            size_t n_read = safe_read (fd, buf, sizeof (buf));
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            if (n_read == SAFE_READ_ERROR)
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              error (EXIT_FAILURE, errno, _("error reading \"%s\""),
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                     css_filename);
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            if (n_read == 0)
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              break;
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            ostream_write_mem (stream->destination, buf, n_read);
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          }
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        if (close (fd) < 0)
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          error (EXIT_FAILURE, errno, _("error after reading \"%s\""),
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                 css_filename);
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      }
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      ostream_write_str (stream->destination, "-->\n"
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                                              "</style>\n");
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    }
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  ostream_write_str (stream->destination, "</head>\n");
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  ostream_write_str (stream->destination, "<body>\n");
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  return stream;
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}

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