Use scalar instead of embedded_scm for context mod overrides.
[lilypond/mpolesky.git] / lily / repeat-acknowledge-engraver.cc
blob4e4b91e3a27104452df81d56e3ca29b28853d4a5
1 /*
2 repeat-acknowledge-engraver.cc -- implement Repeat_acknowledge_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
7 */
9 #include "engraver.hh"
10 #include "translator-group.hh"
11 #include "context.hh"
12 #include "repeated-music.hh"
14 #include "translator.icc"
17 Objective:
19 -- set and reset repeatCommands, so Unfolded_repeat_iterator knows
20 where to set variables.
22 -- collect information passed by Unfolded_repeat_iterator for
23 Bar_engraver: writes whichBar property. (TODO: check for
24 interactions with timing engraver.)
26 class Repeat_acknowledge_engraver : public Engraver
28 public:
30 TRANSLATOR_DECLARATIONS (Repeat_acknowledge_engraver);
31 protected:
32 void start_translation_timestep ();
33 void process_music ();
34 virtual void initialize ();
37 void
38 Repeat_acknowledge_engraver::initialize ()
40 context ()->set_property ("repeatCommands", SCM_EOL);
43 Repeat_acknowledge_engraver::Repeat_acknowledge_engraver ()
47 void
48 Repeat_acknowledge_engraver::start_translation_timestep ()
50 SCM rc;
51 Context *tr = context ()->where_defined (ly_symbol2scm ("repeatCommands"), &rc);
52 if (!tr)
53 tr = context ();
55 tr->set_property ("repeatCommands", SCM_EOL);
58 void
59 Repeat_acknowledge_engraver::process_music ()
62 At the start of a piece, we don't print any repeat bars.
64 if (!now_mom ().main_part_)
65 return;
67 SCM cs = get_property ("repeatCommands");
69 string s = "";
70 bool start = false;
71 bool end = false;
72 bool volta_found = false;
73 while (scm_is_pair (cs))
75 SCM command = scm_car (cs);
76 if (command == ly_symbol2scm ("start-repeat"))
77 start = true;
78 else if (command == ly_symbol2scm ("end-repeat"))
79 end = true;
80 else if (scm_is_pair (command) && scm_car (command) == ly_symbol2scm ("volta"))
81 volta_found = true;
82 cs = scm_cdr (cs);
85 if (start && end)
86 s = robust_scm2string (get_property ("doubleRepeatType"), ":|:");
87 else if (start)
88 s = "|:";
89 else if (end)
90 s = ":|";
93 TODO: line breaks might be allowed if we set whichBar to "".
97 We only set the barline if we wouldn't overwrite a previously set
98 barline.
100 SCM wb = get_property ("whichBar");
101 SCM db = get_property ("defaultBarType");
102 if (!scm_is_string (wb) || ly_is_equal (db, wb))
104 if (s != "" || (volta_found && !scm_is_string (wb)))
105 context ()->set_property ("whichBar", ly_string2scm (s));
109 ADD_TRANSLATOR (Repeat_acknowledge_engraver,
110 /* doc */
111 "Acknowledge repeated music, and convert the contents of"
112 " @code{repeatCommands} into an appropriate setting for"
113 " @code{whichBar}.",
115 /* create */
118 /* read */
119 "doubleRepeatType "
120 "repeatCommands "
121 "whichBar ",
123 /* write */