X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fcontext.cc;h=3da638fe557922cdee4817b22d98e937f6ba38a5;hb=ae49e0dd10feea60fb5bd76cfb6406b7a0cf3e95;hp=4d949e8379c0a02f34003794b7f5e62bf3ec0b80;hpb=233fb6a8b3b6e31de1841641dbbd4c4f43423151;p=lilypond.git

diff --git a/lily/context.cc b/lily/context.cc
index 4d949e8379..3da638fe55 100644
--- a/lily/context.cc
+++ b/lily/context.cc
@@ -86,6 +86,7 @@ Context::Context ()
   implementation_ = 0;
   properties_scm_ = SCM_EOL;
   accepts_list_ = SCM_EOL;
+  default_child_ = SCM_EOL;
   context_list_ = SCM_EOL;
   definition_ = SCM_EOL;
   definition_mods_ = SCM_EOL;
@@ -160,8 +161,29 @@ Context::find_create_context (SCM n, string id, SCM operations)
     Don't create multiple score contexts.
   */
   Global_context *gthis = dynamic_cast<Global_context *> (this);
-  if (gthis && gthis->get_score_context ())
-    return gthis->get_score_context ()->find_create_context (n, id, operations);
+  if (gthis)
+    {
+      if (gthis->get_score_context ())
+        return gthis->get_score_context ()->find_create_context (n, id, operations);
+
+      // Special case: If we use \set Timing.xxx = whatever before
+      // Score is established, the alias of Score to Timing will not
+      // be taken into account.  We check for this particular case
+      // here.  Aliases apart from Score-level ones don't warrant
+      // context creation as they could create unwanted contexts, like
+      // RhythmicVoice instead of Voice.  Creating a Score context,
+      // however, can't really do anything wrong.
+
+      SCM score_name = default_child_context_name ();
+      SCM score_def = find_context_def (get_output_def (), score_name);
+
+      if (Context_def *cd = unsmob_context_def (score_def))
+        {
+          if (cd->is_alias (n))
+            return create_context (cd, id, operations);
+        }
+    }
+
 
   if (Context *existing = find_context_below (this, n, id))
     return existing;
@@ -228,6 +250,12 @@ Context::set_property_from_event (SCM sev)
   if (scm_is_symbol (sym))
     {
       SCM val = ev->get_property ("value");
+
+      if (SCM_UNBNDP (val)) {
+        unset_property (sym);
+        return;
+      }
+          
       bool ok = true;
       if (val != SCM_EOL)
         ok = type_check_assignment (sym, val, ly_symbol2scm ("translation-type?"));
@@ -374,9 +402,7 @@ Context::create_context (Context_def *cdef,
 SCM
 Context::default_child_context_name () const
 {
-  return scm_is_pair (accepts_list_)
-         ? scm_car (accepts_list_)
-         : SCM_EOL;
+  return default_child_;
 }
 
 bool
@@ -465,10 +491,9 @@ Context::internal_send_stream_event (SCM type, Input *origin, SCM props[])
 bool
 Context::is_alias (SCM sym) const
 {
-  if (sym == ly_symbol2scm ("Bottom")
-      && !scm_is_pair (accepts_list_))
-    return true;
-  if (sym == unsmob_context_def (definition_)->get_context_name ())
+  if (scm_is_eq (sym, ly_symbol2scm ("Bottom")))
+    return is_bottom_context ();
+  if (scm_is_eq (sym, context_name_symbol ()))
     return true;
 
   return scm_c_memq (sym, aliases_) != SCM_BOOL_F;
@@ -660,6 +685,7 @@ Context::mark_smob (SCM sm)
   scm_gc_mark (me->definition_mods_);
   scm_gc_mark (me->properties_scm_);
   scm_gc_mark (me->accepts_list_);
+  scm_gc_mark (me->default_child_);
 
   if (me->implementation_)
     scm_gc_mark (me->implementation_->self_scm ());