2 output-property-engraver.cc -- implement Output_property_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
15 class Output_property_engraver : public Engraver
17 TRANSLATOR_DECLARATIONS (Output_property_engraver);
19 Link_array<Music> props_;
21 virtual void stop_translation_timestep ();
22 virtual void acknowledge_grob (Grob_info);
23 virtual bool try_music (Music*);
28 Output_property_engraver::try_music (Music* m)
30 if (m->is_mus_type ("layout-instruction"))
39 Output_property_engraver::acknowledge_grob (Grob_info inf)
41 for (int i=props_.size (); i--;)
43 Music * o = props_[i];
44 SCM pred = o->get_property ("predicate");
48 if (gh_procedure_p (pred))
51 should typecheck pred.
53 SCM result=scm_call_1 (pred, inf.grob_->self_scm ());
54 if (to_boolean (result))
56 SCM sym = o->get_property ("grob-property");
57 SCM val = o->get_property ("grob-value");
58 inf.grob_->internal_set_property (sym, val);
64 dynamic_cast<Context *> (inf.origin_trans_);
67 d = dynamic_cast<Context *> (inf.origin_trans_->daddy_context_);
69 SCM proc = o->get_property ("procedure");
71 inf.grob_->self_scm (),
73 daddy_context_->self_scm ());
79 Output_property_engraver::stop_translation_timestep ()
84 Output_property_engraver::Output_property_engraver ()
88 ENTER_DESCRIPTION (Output_property_engraver,
89 /* descr */ "Interpret Music of Output_property type, and apply a function "
90 " to any Graphic objects that satisfies the predicate.",
92 /* accepts */ "layout-instruction",
93 /* acks */ "grob-interface",