lily/stream-event-scheme.cc

   1 /*
   2   stream-event.cc -- implement Scheme bindings for Stream_event
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2006--2009 Erik Sandberg  <mandolaerik@gmail.com>
   7 */
   8
   9 #include "stream-event.hh"
  10
  11 LY_DEFINE (ly_make_stream_event, "ly:make-stream-event",
  12            1, 1, 0, (SCM cl, SCM proplist),
  13            "Create a stream event of class @var{cl} with the given"
  14            " mutable property list.")
  15 {
  16   LY_ASSERT_TYPE (ly_is_symbol, cl, 1);
  17
  18   /* should be scm_list_p, but scm_list_p is expensive. */
  19   LY_ASSERT_TYPE (scm_is_pair, proplist, 2);
  20
  21   if (proplist == SCM_UNDEFINED)
  22     proplist = SCM_EOL;
  23
  24   Stream_event *e = new Stream_event (cl, proplist);
  25   return e->unprotect ();
  26 }
  27
  28 LY_DEFINE (ly_event_property, "ly:event-property",
  29            2, 0, 0, (SCM sev, SCM sym),
  30            "Get the property @var{sym} of stream event @var{mus}."
  31            "  If @var{sym} is undefined, return @code{'()}.")
  32 {
  33   LY_ASSERT_SMOB (Stream_event, sev, 1);
  34   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  35
  36   Stream_event *e = unsmob_stream_event (sev);
  37
  38   return e->internal_get_property (sym);
  39 }
  40
  41 LY_DEFINE (ly_event_set_property_x, "ly:event-set-property!",
  42            3, 0, 0, (SCM ev, SCM sym, SCM val),
  43            "Set property @var{sym} in event @var{ev} to @var{val}.")
  44 {
  45   LY_ASSERT_SMOB (Stream_event, ev, 1);
  46   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  47
  48   return ly_prob_set_property_x (ev, sym, val);
  49 }
  50
  51 LY_DEFINE (ly_event_deep_copy, "ly:event-deep-copy",
  52            1, 0, 0, (SCM m),
  53            "Copy @var{m} and all sub expressions of@tie{}@var{m}.")
  54 {
  55   SCM copy = m;
  56   if (Stream_event *ev = unsmob_stream_event (m))
  57     {
  58       ev = ev->clone ();
  59       copy = ev->unprotect ();
  60     }
  61   else if (scm_is_pair (m))
  62     copy = scm_cons (ly_event_deep_copy (scm_car (m)),
  63                      ly_event_deep_copy (scm_cdr (m)));
  64
  65   return copy;
  66 }