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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 1998--2015 Jan Nieuwenhuizen <janneke@gnu.org>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "chord-name.hh"
#include "context.hh"
#include "dimensions.hh"
#include "engraver.hh"
#include "font-interface.hh"
#include "item.hh"
#include "output-def.hh"
#include "pitch.hh"
#include "protected-scm.hh"
#include "stream-event.hh"
#include "text-interface.hh"
#include "warn.hh"
#include "translator.icc"
class Chord_name_engraver : public Engraver
{
TRANSLATOR_DECLARATIONS (Chord_name_engraver);
protected:
void stop_translation_timestep ();
void process_music ();
virtual void finalize ();
void listen_note (Stream_event *);
void listen_rest (Stream_event *);
private:
vector<Stream_event *> notes_;
Stream_event *rest_event_;
};
void
Chord_name_engraver::finalize ()
{
}
Chord_name_engraver::Chord_name_engraver ()
{
rest_event_ = 0;
}
void
Chord_name_engraver::process_music ()
{
if (!rest_event_ && notes_.empty ())
return;
SCM markup;
SCM bass = SCM_EOL;
SCM inversion = SCM_EOL;
SCM pitches = SCM_EOL;
Item *chord_name = 0;
// rest events present a hen-and-egg problem with regard to
// overriding the text property of the ChordName grob since we
// cannot create a ChordName grob, look at its text property and, if
// not set, use noChordSymbol to decide whether we should not have
// created the grob in the first place.
if (rest_event_)
{
SCM no_chord_markup = get_property ("noChordSymbol");
if (!Text_interface::is_markup (no_chord_markup))
return;
markup = no_chord_markup;
chord_name = make_item ("ChordName", rest_event_->self_scm ());
chord_name->set_property ("text", markup);
}
else
{
chord_name = make_item ("ChordName", notes_[0]->self_scm ());
// We cannot actually delay fetching the text property in case
// it is a callback since we need to compare the generated
// markups for the sake of chordChanges
markup = chord_name->get_property ("text");
if (!Text_interface::is_markup (markup))
{
for (vsize i = 0; i < notes_.size (); i++)
{
Stream_event *n = notes_[i];
SCM p = n->get_property ("pitch");
if (!unsmob<Pitch> (p))
continue;
if (to_boolean (n->get_property ("bass")))
bass = p;
else
{
SCM oct = n->get_property ("octavation");
if (scm_is_number (oct))
{
Pitch orig = unsmob<Pitch> (p)->transposed (Pitch (-scm_to_int (oct), 0));
pitches = scm_cons (orig.smobbed_copy (), pitches);
}
else
pitches = scm_cons (p, pitches);
if (to_boolean (n->get_property ("inversion")))
{
inversion = p;
if (!scm_is_number (oct))
programming_error ("inversion does not have original pitch");
}
}
}
pitches = scm_sort_list (pitches, Pitch::less_p_proc);
SCM name_proc = get_property ("chordNameFunction");
markup = scm_call_4 (name_proc, pitches, bass, inversion,
context ()->self_scm ());
if (!Text_interface::is_markup (markup))
{
// Ugh, we created a grob, now we better populate it.
// Use an empty string.
markup = scm_string (SCM_EOL);
}
chord_name->set_property ("text", markup);
}
}
SCM chord_changes = get_property ("chordChanges");
SCM last_chord = get_property ("lastChord");
if (to_boolean (chord_changes) && ly_is_equal (markup, last_chord))
chord_name->set_property ("begin-of-line-visible", SCM_BOOL_T);
context ()->set_property ("lastChord", markup);
}
void
Chord_name_engraver::listen_note (Stream_event *ev)
{
notes_.push_back (ev);
}
void
Chord_name_engraver::listen_rest (Stream_event *ev)
{
ASSIGN_EVENT_ONCE (rest_event_, ev);
}
void
Chord_name_engraver::stop_translation_timestep ()
{
notes_.clear ();
rest_event_ = 0;
}
/*
The READs description is not strictly accurate:
which properties are read depend on the chord naming function active.
*/
void
Chord_name_engraver::boot ()
{
ADD_LISTENER (Chord_name_engraver, note);
ADD_LISTENER (Chord_name_engraver, rest);
}
ADD_TRANSLATOR (Chord_name_engraver,
/* doc */
"Catch note and rest events and generate the appropriate chordname.",
/* create */
"ChordName ",
/* read */
"chordChanges "
"chordNameExceptions "
"chordNameFunction "
"chordNoteNamer "
"chordRootNamer "
"chordNameExceptions "
"lastChord "
"majorSevenSymbol "
"noChordSymbol ",
/* write */
"lastChord "
);
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