lily/global-context-scheme.cc

   1 /*
   2   global-context-scheme.cc -- implement Global_context bindings
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8 #include "cpu-timer.hh"
   9 #include "global-context.hh"
  10 #include "international.hh"
  11 #include "main.hh"
  12 #include "music-iterator.hh"
  13 #include "music-output.hh"
  14 #include "music.hh"
  15 #include "object-key.hh"
  16 #include "output-def.hh"
  17 #include "translator-group.hh"
  18 #include "warn.hh"
  19
  20 LY_DEFINE (ly_format_output, "ly:format-output",
  21            1, 0, 0, (SCM context),
  22            "Given a Global context in its final state, "
  23            "process it and return the @code{Music_output} object in its final state.")
  24 {
  25   Global_context *g = dynamic_cast<Global_context *> (unsmob_context (context));
  26   SCM_ASSERT_TYPE (g, context, SCM_ARG1, __FUNCTION__, "Global context");
  27
  28   SCM output = g->get_output ();
  29   progress_indication ("\n");
  30
  31   if (Music_output *od = unsmob_music_output (output))
  32     od->process ();
  33
  34   return output;
  35 }
  36
  37 LY_DEFINE (ly_make_global_translator, "ly:make-global-translator",
  38           1, 0, 0, (SCM global),
  39           "Create a translator group and connect it to the global context\n"
  40           "@var{global}. The translator group is returned.")
  41 {
  42   Global_context *g = dynamic_cast<Global_context *> (unsmob_context (global));
  43   SCM_ASSERT_TYPE (g, global, SCM_ARG1, __FUNCTION__, "Global context");
  44
  45   Translator_group *tg = new Translator_group ();
  46   tg->connect_to_context (g);
  47   g->implementation_ = tg;
  48
  49   return tg->unprotect ();
  50 }
  51
  52 LY_DEFINE (ly_make_global_context, "ly:make-global-context",
  53            1, 1, 0, (SCM output_def, SCM key),
  54            "Set up a global interpretation context, using the output\n"
  55            "block @var{output_def}.\n"
  56            "The context is returned.\n"
  57
  58            "\n\nOptionally, this routine takes an Object-key to\n"
  59            "to uniquely identify the Score block containing it.\n")
  60 {
  61   Output_def *odef = unsmob_output_def (output_def);
  62
  63   SCM_ASSERT_TYPE (odef, output_def, SCM_ARG1, __FUNCTION__,
  64                    "Output definition");
  65
  66   Global_context *glob = new Global_context (odef, unsmob_key (key));
  67
  68   if (!glob)
  69     {
  70       programming_error ("no toplevel translator");
  71       return SCM_BOOL_F;
  72     }
  73
  74   return glob->unprotect ();
  75 }
  76
  77 LY_DEFINE (ly_interpret_music_expression, "ly:interpret-music-expression",
  78            2, 0, 0, (SCM mus, SCM ctx),
  79            "Interpret the music expression @var{mus} in the\n"
  80            "global context @var{ctx}. The context is returned in its\n"
  81            "final state.\n")
  82 {
  83   Music *music = unsmob_music (mus);
  84   Global_context *g = dynamic_cast<Global_context *> (unsmob_context (ctx));
  85   SCM_ASSERT_TYPE (music, mus, SCM_ARG1, __FUNCTION__, "Music");
  86   SCM_ASSERT_TYPE (g, ctx, SCM_ARG2, __FUNCTION__, "Global context");
  87
  88   if (!music
  89       || !music->get_length ().to_bool ())
  90     {
  91       warning (_ ("no music found in score"));
  92       return SCM_BOOL_F;
  93     }
  94
  95   Cpu_timer timer;
  96
  97   message (_ ("Interpreting music... "));
  98
  99   SCM protected_iter = Music_iterator::get_static_get_iterator (music);
 100   Music_iterator *iter = unsmob_iterator (protected_iter);
 101
 102   iter->init_context (music, g);
 103   iter->construct_children ();
 104
 105   if (!iter->ok ())
 106     {
 107       warning (_ ("no music found in score"));
 108       /* todo: should throw exception. */
 109       return SCM_BOOL_F;
 110     }
 111
 112   g->run_iterator_on_me (iter);
 113
 114   iter->quit ();
 115   scm_remember_upto_here_1 (protected_iter);
 116
 117   send_stream_event (g, "Finish", 0, 0);
 118
 119   if (be_verbose_global)
 120     message (_f ("elapsed time: %.2f seconds", timer.read ()));
 121
 122   return ctx;
 123 }
 124
 125 LY_DEFINE (ly_run_translator, "ly:run-translator",
 126            2, 1, 0, (SCM mus, SCM output_def, SCM key),
 127            "Process @var{mus} according to @var{output_def}. \n"
 128            "An interpretation context is set up,\n"
 129            "and @var{mus} is interpreted with it.  \n"
 130            "The context is returned in its final state.\n"
 131            "\n\n"
 132            "Optionally, this routine takes an Object-key to\n"
 133            "to uniquely identify the Score block containing it.\n")
 134 {
 135   SCM glob = ly_make_global_context (output_def, key);
 136   ly_make_global_translator (glob);
 137   ly_interpret_music_expression (mus, glob);
 138   return glob;
 139 }