lily/stream-event-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2006--2011 Erik Sandberg  <mandolaerik@gmail.com>
   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 "stream-event.hh"
  21
  22 LY_DEFINE (ly_stream_event_p, "ly:stream-event?",
  23            1, 0, 0, (SCM obj),
  24            "Is @code{@var{obj}} a @code{Stream_event} object?")
  25 {
  26   return scm_from_bool (unsmob_stream_event (obj));
  27 }
  28
  29 LY_DEFINE (ly_make_stream_event, "ly:make-stream-event",
  30            1, 1, 0, (SCM cl, SCM proplist),
  31            "Create a stream event of class @var{cl} with the given"
  32            " mutable property list.")
  33 {
  34   LY_ASSERT_TYPE (ly_is_symbol, cl, 1);
  35
  36   /* should be scm_list_p, but scm_list_p is expensive. */
  37   LY_ASSERT_TYPE (scm_is_pair, proplist, 2);
  38
  39   if (proplist == SCM_UNDEFINED)
  40     proplist = SCM_EOL;
  41
  42   Stream_event *e = new Stream_event (cl, proplist);
  43   return e->unprotect ();
  44 }
  45
  46 LY_DEFINE (ly_event_property, "ly:event-property",
  47            2, 0, 0, (SCM sev, SCM sym),
  48            "Get the property @var{sym} of stream event @var{mus}."
  49            "  If @var{sym} is undefined, return @code{'()}.")
  50 {
  51   LY_ASSERT_TYPE (unsmob_stream_event, sev, 1);
  52   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  53
  54   Stream_event *e = unsmob_stream_event (sev);
  55
  56   return e->internal_get_property (sym);
  57 }
  58
  59 LY_DEFINE (ly_event_set_property_x, "ly:event-set-property!",
  60            3, 0, 0, (SCM ev, SCM sym, SCM val),
  61            "Set property @var{sym} in event @var{ev} to @var{val}.")
  62 {
  63   LY_ASSERT_TYPE (unsmob_stream_event, ev, 1);
  64   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  65
  66   return ly_prob_set_property_x (ev, sym, val);
  67 }
  68
  69 LY_DEFINE (ly_event_deep_copy, "ly:event-deep-copy",
  70            1, 0, 0, (SCM m),
  71            "Copy @var{m} and all sub expressions of@tie{}@var{m}.")
  72 {
  73   SCM copy = m;
  74   if (Stream_event *ev = unsmob_stream_event (m))
  75     {
  76       ev = ev->clone ();
  77       copy = ev->unprotect ();
  78     }
  79   else if (scm_is_pair (m))
  80     copy = scm_cons (ly_event_deep_copy (scm_car (m)),
  81                      ly_event_deep_copy (scm_cdr (m)));
  82
  83   return copy;
  84 }