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[lilypond.git] / lily / context.cc

diff --git a/lily/context.cc b/lily/context.cc
index 758bcdfda881db504fee52e56319d0693089724c..3da638fe557922cdee4817b22d98e937f6ba38a5 100644 (file)
--- a/lily/context.cc
+++ b/lily/context.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 2004--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 2004--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -35,7 +35,7 @@
 bool
 Context::is_removable () const
 {
-  return context_list_ == SCM_EOL && ! iterator_count_
+  return context_list_ == SCM_EOL && ! client_count_
          && !dynamic_cast<Global_context const *> (daddy_context_);
 }
 
@@ -82,15 +82,17 @@ Context::Context ()
 {
   daddy_context_ = 0;
   aliases_ = SCM_EOL;
-  iterator_count_ = 0;
+  client_count_ = 0;
   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;
   event_source_ = 0;
   events_below_ = 0;
+  ancestor_lookup_ = SCM_UNDEFINED;
 
   smobify_self ();
 
@@ -159,8 +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;
@@ -227,6 +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?"));
@@ -265,7 +294,7 @@ Context::create_context_from_event (SCM sev)
 
   if (path.size () != 1)
     {
-      programming_error (_f ("Invalid CreateContext event: Cannot create %s context", type.c_str ()));
+      programming_error (to_string ("Invalid CreateContext event: Cannot create %s context", type.c_str ()));
       return;
     }
   Context_def *cdef = path[0];
@@ -318,7 +347,7 @@ Context::path_to_acceptable_context (SCM name) const
   // The 'accepts elements in definition_mods_ is a list of ('accepts string),
   // but the Context_def expects to see elements of the form ('accepts symbol).
   SCM accepts = SCM_EOL;
-  for (SCM s = scm_reverse (definition_mods_); scm_is_pair (s); s = scm_cdr (s))
+  for (SCM s = definition_mods_; scm_is_pair (s); s = scm_cdr (s))
     if (scm_caar (s) == ly_symbol2scm ("accepts"))
       {
         SCM elt = scm_list_2 (scm_caar (s), scm_string_to_symbol (scm_cadar (s)));
@@ -327,7 +356,7 @@ Context::path_to_acceptable_context (SCM name) const
 
   return unsmob_context_def (definition_)->path_to_acceptable_context (name,
          get_output_def (),
-         accepts);
+         scm_reverse_x (accepts, SCM_EOL));
 
 }
 
@@ -373,9 +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
@@ -452,7 +479,7 @@ be called from any other place than the send_stream_event macro.
 void
 Context::internal_send_stream_event (SCM type, Input *origin, SCM props[])
 {
-  Stream_event *e = new Stream_event (type, origin);
+  Stream_event *e = new Stream_event (make_event_class (type), origin);
   for (int i = 0; props[i]; i += 2)
     {
       e->set_property (props[i], props[i + 1]);
@@ -464,10 +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;
@@ -489,10 +515,13 @@ Context::instrumented_set_property (SCM sym, SCM val, const char *, int, const c
 void
 Context::internal_set_property (SCM sym, SCM val)
 {
+  bool type_check_ok = type_check_assignment (sym, val, ly_symbol2scm ("translation-type?"));
+
   if (do_internal_type_checking_global)
-    assert (type_check_assignment (sym, val, ly_symbol2scm ("translation-type?")));
+    assert (type_check_ok);
 
-  properties_dict ()->set (sym, val);
+  if (type_check_ok)
+    properties_dict ()->set (sym, val);
 }
 
 /*
@@ -590,6 +619,14 @@ Context::get_score_context () const
     return 0;
 }
 
+SCM
+Context::make_event_class (SCM event_type)
+{
+  if (SCM_UNBNDP (ancestor_lookup_))
+    ancestor_lookup_ = get_global_context ()->ancestor_lookup_;
+  return scm_hashq_ref (ancestor_lookup_, event_type, SCM_EOL);
+}
+
 Output_def *
 Context::get_output_def () const
 {
@@ -648,6 +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 ());
@@ -658,6 +696,8 @@ Context::mark_smob (SCM sm)
   if (me->events_below_)
     scm_gc_mark (me->events_below_->self_scm ());
 
+  scm_gc_mark (me->ancestor_lookup_);
+
   return me->properties_scm_;
 }