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1 /*
2   This file is part of LilyPond, the GNU music typesetter.
3
4   Copyright (C) 2002--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
5
6   LilyPond is free software: you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation, either version 3 of the License, or
9   (at your option) any later version.
10
11   LilyPond is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "music.hh"
21 #include "sequential-iterator.hh"
22 #include "context.hh"
23
24 class Volta_repeat_iterator : public Sequential_iterator
25 {
26 public:
27   DECLARE_SCHEME_CALLBACK (constructor, ());
28   Volta_repeat_iterator ();
29
30   void add_repeat_command (SCM);
31 protected:
32   virtual SCM get_music_list () const;
33   virtual void next_element (bool);
34   virtual void construct_children ();
35   virtual void process (Moment);
36   virtual void derived_mark () const;
37
38   bool first_time_;
39   int alt_count_;
40   int rep_count_;
41   int done_count_;
42   SCM alt_restores_;
43 };
44
45 Volta_repeat_iterator::Volta_repeat_iterator ()
46 {
47   done_count_ = alt_count_ = rep_count_ = 0;
48   first_time_ = true;
49   alt_restores_ = SCM_EOL;
50 }
51
52 void
53 Volta_repeat_iterator::derived_mark () const
54 {
55   scm_gc_mark (alt_restores_);
56   Sequential_iterator::derived_mark ();
57 }
58
59 SCM
60 Volta_repeat_iterator::get_music_list ()const
61 {
62   return scm_cons (get_music ()->get_property ("element"),
63                    Sequential_iterator::get_music_list ());
64 }
65
66 void
67 Volta_repeat_iterator::construct_children ()
68 {
69   Sequential_iterator::construct_children ();
70
71   SCM alts = get_music ()->get_property ("elements");
72
73   alt_count_ = int (scm_ilength (alts));
74   rep_count_ = scm_to_int (get_music ()->get_property ("repeat-count"));
75   done_count_ = 0;
76 }
77
78 /*
79   TODO: add source information for debugging
80 */
81 void
82 Volta_repeat_iterator::add_repeat_command (SCM what)
83 {
84   SCM reps = ly_symbol2scm ("repeatCommands");
85   SCM current_reps = SCM_EOL;
86   Context *where = get_outlet ()->where_defined (reps, &current_reps);
87
88   if (where
89       && (current_reps == SCM_EOL || scm_is_pair (current_reps)))
90     {
91       current_reps = scm_cons (what, current_reps);
92       where->set_property (reps, current_reps);
93     }
94 }
95
96 void
97 Volta_repeat_iterator::next_element (bool side_effect)
98 {
99   done_count_++;
100
101   Sequential_iterator::next_element (side_effect);
102
103   if (side_effect)
104     {
105       if (alt_count_)
106         {
107           string repstr = ::to_string (rep_count_ - alt_count_ + done_count_) + ".";
108           if (done_count_ <= 1)
109             {
110               alt_restores_ = SCM_EOL;
111               if (to_boolean (get_outlet ()->get_property ("timing")))
112                 {
113                   for (SCM lst = get_outlet ()->get_property ("alternativeRestores");
114                        scm_is_pair (lst);
115                        lst = scm_cdr (lst))
116                     {
117                       SCM res = SCM_EOL;
118                       Context *t = get_outlet ()->where_defined (scm_car (lst),
119                                                                  &res);
120                       if (t)
121                         {
122                           alt_restores_ = scm_cons
123                             (scm_list_3 (t->self_scm (), scm_car (lst), res),
124                              alt_restores_);
125                         }
126                     }
127                 }
128             }
129           else
130             {
131
132               add_repeat_command (scm_list_n (ly_symbol2scm ("volta"), SCM_BOOL_F, SCM_UNDEFINED));
133
134               if (done_count_ - 1 < alt_count_)
135                 add_repeat_command (ly_symbol2scm ("end-repeat"));
136
137               if (to_boolean (get_outlet ()->get_property ("timing")))
138                 {
139                   for (SCM p = alt_restores_; scm_is_pair (p); p = scm_cdr (p))
140                     scm_apply_0 (ly_lily_module_constant ("ly:context-set-property!"),
141                                  scm_car (p));
142                 }
143             }
144
145           if (done_count_ == 1 && alt_count_ < rep_count_)
146             repstr = "1.--" + ::to_string (rep_count_ - alt_count_ + done_count_) + ".";
147
148           if (done_count_ <= alt_count_)
149             add_repeat_command (scm_list_n (ly_symbol2scm ("volta"),
150                                             ly_string2scm (repstr), SCM_UNDEFINED));
151         }
152       else
153         add_repeat_command (ly_symbol2scm ("end-repeat"));
154     }
155 }
156
157 void
158 Volta_repeat_iterator::process (Moment m)
159 {
160   if (first_time_)
161     {
162       add_repeat_command (ly_symbol2scm ("start-repeat"));
163       first_time_ = false;
164     }
165   Sequential_iterator::process (m);
166 }
167
168 IMPLEMENT_CTOR_CALLBACK (Volta_repeat_iterator);