lily/property-engraver.cc

   1 /*
   2   property-engraver.cc --  implement Property engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "lily-guile.hh"
  11 #include "engraver.hh"
  12 #include "protected-scm.hh"
  13 #include "dictionary.hh"
  14 #include "score-element.hh"
  15
  16 class Property_engraver : public Engraver
  17 {
  18   Dictionary<Protected_scm> prop_dict_;
  19   void apply_properties (SCM, Score_element*);
  20
  21 protected:
  22   virtual void acknowledge_element (Score_element_info ei);
  23   virtual void do_creation_processing ();
  24
  25   VIRTUAL_COPY_CONS(Translator);
  26 };
  27
  28 void
  29 Property_engraver::do_creation_processing ()
  30 {
  31   SCM plist = get_property ("Generic_property_list", 0);
  32   for (; SCM_NIMP (plist); plist = gh_cdr (plist))
  33     {
  34       SCM elt_props = gh_car (plist);
  35       prop_dict_[ly_scm2string (gh_car (elt_props))] = gh_cdr (elt_props);
  36     }
  37 }
  38
  39 void
  40 Property_engraver::acknowledge_element (Score_element_info i)
  41 {
  42   if (prop_dict_.elem_b (i.elem_l_->name()))
  43     {
  44       SCM p = prop_dict_[i.elem_l_->name()];
  45       apply_properties (p,i.elem_l_);
  46     }
  47   if (prop_dict_.elem_b ("all"))
  48     {
  49       apply_properties (prop_dict_["all"], i.elem_l_);
  50     }
  51 }
  52
  53 void
  54 Property_engraver::apply_properties (SCM p, Score_element *e)
  55 {
  56   for (; gh_pair_p (p); p = gh_cdr (p))
  57     {
  58       SCM entry = gh_car (p);
  59       SCM prop_sym = gh_car (entry);
  60       SCM type_p   = gh_cadr (entry);
  61       SCM elt_prop_name = gh_caddr (entry);
  62
  63       SCM preset = scm_assq(prop_sym, e->element_property_alist_);
  64       if (preset != SCM_BOOL_F)
  65         continue;
  66
  67       SCM val = get_property (prop_sym, 0);
  68       if (val != SCM_UNDEFINED
  69           && gh_apply (type_p, scm_listify (val, SCM_UNDEFINED))
  70           == SCM_BOOL_T)
  71         e->set_elt_property (ly_symbol2string (elt_prop_name), val);
  72     }
  73 }
  74
  75 ADD_THIS_TRANSLATOR(Property_engraver);