1  /* Output stream with no-op styling.
       2     Copyright (C) 2006, 2019-2020 Free Software Foundation, Inc.
       3     Written by Bruno Haible <bruno@clisp.org>, 2019.
       4  
       5     This program is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU General Public License as published by
       7     the Free Software Foundation; either version 3 of the License, or
       8     (at your option) any later version.
       9  
      10     This program is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13     GNU General Public License for more details.
      14  
      15     You should have received a copy of the GNU General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <config.h>
      19  
      20  /* Specification.  */
      21  #include "noop-styled-ostream.h"
      22  
      23  #include "xalloc.h"
      24  
      25  
      26  struct noop_styled_ostream : struct styled_ostream
      27  {
      28  fields:
      29    /* The destination stream.  */
      30    ostream_t destination;
      31    bool own_destination;
      32    /* The current hyperlink ref and id.  */
      33    char *hyperlink_ref;
      34    char *hyperlink_id;
      35  };
      36  
      37  /* Implementation of ostream_t methods.  */
      38  
      39  static void
      40  noop_styled_ostream::write_mem (noop_styled_ostream_t stream,
      41                                  const void *data, size_t len)
      42  {
      43    ostream_write_mem (stream->destination, data, len);
      44  }
      45  
      46  static void
      47  noop_styled_ostream::flush (noop_styled_ostream_t stream,
      48                              ostream_flush_scope_t scope)
      49  {
      50    ostream_flush (stream->destination, scope);
      51  }
      52  
      53  static void
      54  noop_styled_ostream::free (noop_styled_ostream_t stream)
      55  {
      56    if (stream->own_destination)
      57      ostream_free (stream->destination);
      58    free (stream->hyperlink_ref);
      59    free (stream->hyperlink_id);
      60    free (stream);
      61  }
      62  
      63  /* Implementation of styled_ostream_t methods.  */
      64  
      65  static void
      66  noop_styled_ostream::begin_use_class (noop_styled_ostream_t stream,
      67                                        const char *classname)
      68  {
      69  }
      70  
      71  static void
      72  noop_styled_ostream::end_use_class (noop_styled_ostream_t stream,
      73                                      const char *classname)
      74  {
      75  }
      76  
      77  static const char *
      78  noop_styled_ostream::get_hyperlink_ref (noop_styled_ostream_t stream)
      79  {
      80    return stream->hyperlink_ref;
      81  }
      82  
      83  static const char *
      84  noop_styled_ostream::get_hyperlink_id (noop_styled_ostream_t stream)
      85  {
      86    return stream->hyperlink_id;
      87  }
      88  
      89  static void
      90  noop_styled_ostream::set_hyperlink (noop_styled_ostream_t stream,
      91                                      const char *ref, const char *id)
      92  {
      93    char *ref_copy = (ref != NULL ? xstrdup (ref) : NULL);
      94    char *id_copy = (id != NULL ? xstrdup (id) : NULL);
      95  
      96    free (stream->hyperlink_ref);
      97    stream->hyperlink_ref = ref_copy;
      98    free (stream->hyperlink_id);
      99    stream->hyperlink_id = id_copy;
     100  }
     101  
     102  static void
     103  noop_styled_ostream::flush_to_current_style (noop_styled_ostream_t stream)
     104  {
     105    ostream_flush (stream->destination, FLUSH_THIS_STREAM);
     106  }
     107  
     108  /* Constructor.  */
     109  
     110  noop_styled_ostream_t
     111  noop_styled_ostream_create (ostream_t destination, bool pass_ownership)
     112  {
     113    noop_styled_ostream_t stream =
     114      XMALLOC (struct noop_styled_ostream_representation);
     115  
     116    stream->base.base.vtable = &noop_styled_ostream_vtable;
     117    stream->destination = destination;
     118    stream->own_destination = pass_ownership;
     119    stream->hyperlink_ref = NULL;
     120    stream->hyperlink_id = NULL;
     121  
     122    return stream;
     123  }
     124  
     125  /* Accessors.  */
     126  
     127  static ostream_t
     128  noop_styled_ostream::get_destination (noop_styled_ostream_t stream)
     129  {
     130    return stream->destination;
     131  }
     132  
     133  static bool
     134  noop_styled_ostream::is_owning_destination (noop_styled_ostream_t stream)
     135  {
     136    return stream->own_destination;
     137  }
     138  
     139  /* Instanceof test.  */
     140  
     141  bool
     142  is_instance_of_noop_styled_ostream (ostream_t stream)
     143  {
     144    return IS_INSTANCE (stream, ostream, noop_styled_ostream);
     145  }