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* lily/include/lily-guile.hh: many new ly_ functions. Thanks to
[lilypond.git] / lily / unfolded-repeat-iterator.cc
1 /*   
2 unfolded-repeat-iterator.cc --  implement Unfolded_repeat_iterator, Volta_repeat_iterator
3
4 source file of the GNU LilyPond music typesetter
5
6
7 (c) 2002--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 */
9
10
11 #include "music.hh"
12 #include "sequential-iterator.hh"
13 #include "context.hh"
14
15 class Unfolded_repeat_iterator : public Sequential_iterator
16 {
17 public:
18   DECLARE_SCHEME_CALLBACK (constructor, ());
19 protected:
20   virtual SCM get_music_list () const;
21 };
22
23
24 SCM
25 Unfolded_repeat_iterator::get_music_list () const
26 {
27   SCM l = SCM_EOL;
28   SCM *tail = &l;
29   
30   SCM body = get_music ()->get_property ("element");
31   SCM alts = get_music ()->get_property ("elements");
32   int alt_count = scm_ilength (alts);
33   int rep_count = ly_scm2int (get_music ()->get_property ("repeat-count"));
34
35   for (int i = 0; i < rep_count; i++)
36     {
37       if (unsmob_music (body))
38         *tail = scm_cons (body, SCM_EOL) ;
39
40       tail = SCM_CDRLOC (*tail);
41
42       if (alt_count)
43         {
44           *tail = scm_cons (ly_car (alts), SCM_EOL);
45           tail = SCM_CDRLOC (*tail);
46           if (i >= rep_count - alt_count)
47             
48             alts = ly_cdr (alts);
49         }      
50     }
51
52   return l; 
53 }
54
55 class Volta_repeat_iterator : public Sequential_iterator
56 {
57 public:
58   DECLARE_SCHEME_CALLBACK (constructor, ());
59   Volta_repeat_iterator ();
60
61   void add_repeat_command (SCM);
62 protected:
63   virtual SCM get_music_list () const;
64   virtual void next_element (bool);
65   virtual void construct_children ();
66   virtual void process (Moment);
67
68   bool first_time_;
69   int alt_count_;
70   int rep_count_;
71   int done_count_;
72 };
73
74
75 Volta_repeat_iterator::Volta_repeat_iterator ()
76 {
77   done_count_ = alt_count_ = rep_count_= 0;
78   first_time_ = true;
79 }
80
81 SCM
82 Volta_repeat_iterator::get_music_list ()const
83 {
84   return scm_cons (get_music ()->get_property ("element"),
85                   get_music ()->get_property ("elements"));
86 }
87
88 void
89 Volta_repeat_iterator::construct_children ()
90 {
91   Sequential_iterator::construct_children ();
92   
93   SCM alts = get_music ()->get_property ("elements");
94
95   alt_count_ = scm_ilength (alts);
96   rep_count_ = ly_scm2int (get_music ()->get_property ("repeat-count"));
97   done_count_ = 0;
98 }
99
100
101 /*
102   TODO: add source information for debugging
103  */
104 void
105 Volta_repeat_iterator::add_repeat_command (SCM what)
106 {
107   SCM reps = ly_symbol2scm ("repeatCommands");
108   SCM current_reps = get_outlet ()->internal_get_property (reps);
109
110   Context * where = get_outlet ()->where_defined (reps);
111   if (where
112       && current_reps == SCM_EOL || ly_pair_p (current_reps))
113     {
114       current_reps = scm_cons (what, current_reps);
115       where->internal_set_property (reps, current_reps);
116     }
117 }
118
119
120 void
121 Volta_repeat_iterator::next_element (bool side_effect)
122 {
123   done_count_ ++;
124
125   Sequential_iterator::next_element (side_effect);
126
127   if (side_effect)
128     {    
129       if (alt_count_)
130         {
131           String repstr = to_string (rep_count_ - alt_count_ + done_count_) + ".";
132           if (done_count_ > 1)
133             {
134               add_repeat_command (scm_list_n (ly_symbol2scm ("volta"), SCM_BOOL_F, SCM_UNDEFINED));
135
136               if (done_count_ - 1 < alt_count_)
137                 add_repeat_command (ly_symbol2scm ("end-repeat"));
138             }
139
140           
141       
142           if (done_count_ == 1 && alt_count_ < rep_count_)
143             {
144               repstr = "1.--" + to_string (rep_count_ - alt_count_ + done_count_) + ".";
145             }
146
147           if (done_count_ <= alt_count_)
148             add_repeat_command (scm_list_n (ly_symbol2scm ("volta"),
149                                             scm_makfrom0str (repstr.to_str0 ()), SCM_UNDEFINED));
150         }
151       else
152         {
153           add_repeat_command (ly_symbol2scm ("end-repeat"));
154         }
155     }
156 }
157
158
159 void
160 Volta_repeat_iterator::process (Moment m)
161 {
162   if (first_time_)
163     {
164       add_repeat_command (ly_symbol2scm ("start-repeat"));
165       first_time_ = false;
166     }
167   Sequential_iterator::process (m);
168 }
169
170
171 IMPLEMENT_CTOR_CALLBACK (Volta_repeat_iterator);
172 IMPLEMENT_CTOR_CALLBACK (Unfolded_repeat_iterator);