lily/engraver-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21 #include "grob.hh"
  22
  23 LY_DEFINE (ly_engraver_make_grob, "ly:engraver-make-grob",
  24            3, 0, 0, (SCM engraver, SCM grob_name, SCM cause),
  25            "Create a grob originating from given @var{engraver} instance,"
  26            " with given @var{grob-name}, a symbol."
  27            "  @var{cause} should either be another grob"
  28            " or a music event.")
  29 {
  30   LY_ASSERT_TYPE (unsmob_engraver, engraver, 1);
  31   LY_ASSERT_TYPE (ly_is_symbol, grob_name, 2);
  32   LY_ASSERT_TYPE (ly_is_grob_cause, cause, 3);
  33
  34   Grob *g = unsmob_engraver (engraver)->
  35     internal_make_grob(grob_name, cause,
  36                        ly_symbol2string (grob_name).c_str (),
  37                        "scheme", 0, "scheme");
  38   return g->self_scm ();
  39 }
  40
  41 LY_DEFINE (ly_engraver_announce_end_grob, "ly:engraver-announce-end-grob",
  42            3, 0, 0, (SCM engraver, SCM grob, SCM cause),
  43            "Announce the end of a grob (i.e., the end of a spanner)"
  44            " originating from given @var{engraver} instance, with"
  45            " @var{grob} being a grob.  @var{cause} should either"
  46            " be another grob or a music event.")
  47 {
  48   LY_ASSERT_TYPE (unsmob_engraver, engraver, 1);
  49   LY_ASSERT_SMOB (Grob, grob, 2);
  50   LY_ASSERT_TYPE (ly_is_grob_cause, cause, 3);
  51
  52   unsmob_engraver (engraver)->
  53     announce_end_grob (unsmob_grob (grob), cause);
  54
  55   return SCM_UNSPECIFIED;
  56 }