lily/include/engraver.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2010 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 #ifndef ENGRAVER_HH
  21 #define ENGRAVER_HH
  22
  23 #include "grob-info.hh"
  24 #include "translator.hh"
  25
  26 /**
  27    a struct which processes events, and creates the #Grob#s.
  28    It may use derived classes.
  29 */
  30 class Engraver : public Translator
  31 {
  32   Grob *internal_make_grob (SCM sym, SCM cause, char const *name,
  33                             char const *f, int l, char const *fun);
  34   friend SCM ly_engraver_make_grob (SCM, SCM, SCM);
  35   friend class Engraver_group;
  36 protected:
  37   /*
  38     take note of item/spanner
  39     put item in spanner. Adjust local key; etc.
  40
  41     Default: ignore the info
  42   */
  43   virtual void acknowledge_grob (Grob_info) {}
  44   virtual void announce_grob (Grob_info);
  45   virtual void announce_end_grob (Grob_info);
  46   Engraver_group *get_daddy_engraver () const;
  47
  48 public:
  49   /**
  50      Announce element. Default: pass on to daddy. Utility
  51   */
  52   void announce_grob (Grob *, SCM cause);
  53   void announce_end_grob (Grob *, SCM cause);
  54
  55   Item *internal_make_item (SCM sym, SCM cause, char const *name,
  56                             char const *f, int l, char const *fun);
  57   Spanner *internal_make_spanner (SCM sym, SCM cause, char const *name,
  58                                   char const *f, int l, char const *fun);
  59   Paper_column *internal_make_column (SCM sym, char const *name,
  60                                       char const *f, int l, char const *fun);
  61
  62   /**
  63      override other ctor
  64   */
  65   TRANSLATOR_DECLARATIONS (Engraver);
  66 };
  67
  68 #define make_item(x, cause) internal_make_item (ly_symbol2scm (x), cause, x, __FILE__, __LINE__, __FUNCTION__)
  69 #define make_spanner(x, cause) internal_make_spanner (ly_symbol2scm (x), cause, x, __FILE__, __LINE__, __FUNCTION__)
  70 #define make_paper_column(x) internal_make_column (ly_symbol2scm (x), x, __FILE__, __LINE__, __FUNCTION__)
  71
  72 Engraver* unsmob_engraver (SCM eng);
  73 bool ly_is_grob_cause (SCM obj);
  74
  75 #endif // ENGRAVER_HH