lily/include/translator.hh

   1 /*
   2   translator.hh -- declare Translator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #ifndef TRANSLATOR_HH
  11 #define TRANSLATOR_HH
  12
  13 #include "global-ctor.hh"
  14 #include "string.hh"
  15 #include "lily-proto.hh"
  16 #include "virtual-methods.hh"
  17 #include "lily-guile.hh"
  18 #include "input.hh"
  19 #include "smobs.hh"
  20
  21 #define get_property(x) internal_get_property(ly_symbol2scm(x))
  22
  23
  24 #define TRANSLATOR_DECLARATIONS(NAME)                   \
  25 public:                                                 \
  26   NAME();\
  27   VIRTUAL_COPY_CONS (Translator);                               \
  28   static SCM static_description_;                       \
  29   virtual SCM static_translator_description () const;   \
  30   virtual SCM translator_description () const;
  31
  32 /*
  33   Translate music into grobs.
  34 */
  35 class Translator
  36 {
  37   void init ();
  38 public:
  39   Music_output_def * output_def_;
  40   String type_string_;
  41
  42   bool is_alias_b (String) const;
  43
  44
  45   Translator (Translator const &);
  46
  47
  48   Translator_group * daddy_trans_ ;
  49   void removal_processing ();
  50   /**
  51     ask daddy for a feature
  52     */
  53   Music_output_def *get_output_def () const;
  54
  55   SCM internal_get_property (SCM symbol) const;
  56
  57   virtual Moment now_mom () const;
  58
  59   /*
  60     ugh: bubbled up from Translator_group.
  61    */
  62   SCM simple_trans_list_;
  63   SCM trans_group_list_;
  64   SCM definition_;
  65
  66   SCM properties_scm_;
  67   DECLARE_SMOBS (Translator, dummy);
  68
  69
  70 public:
  71   Global_translator * top_translator () const;
  72   TRANSLATOR_DECLARATIONS(Translator);
  73     /**
  74     try to fit the request in this engraver
  75
  76     @return
  77     false: not noted,  not taken.
  78
  79     true: request swallowed. Don't try to put the request elsewhere.
  80
  81     */
  82   virtual bool try_music (Music *req);
  83   virtual void stop_translation_timestep ();
  84   virtual void start_translation_timestep ();
  85   virtual void do_announces () ;
  86   virtual void initialize () ;
  87   virtual void finalize ();
  88 };
  89
  90
  91 /**
  92   A macro to automate administration of translators.
  93  */
  94 #define ADD_THIS_TRANSLATOR(T)                          \
  95 SCM T::static_description_ = SCM_EOL;\
  96 static void  _ ## T ## _adder () {\
  97       T *t = new T;\
  98       T::static_description_ = t->static_translator_description ();\
  99       scm_permanent_object (T::static_description_);\
 100       t->type_string_ = classname (t);\
 101       add_translator (t);\
 102 }\
 103 SCM T::translator_description() const\
 104 { \
 105   return static_description_;\
 106 }\
 107 ADD_GLOBAL_CTOR (_ ## T ## _adder);
 108
 109
 110
 111
 112 #define ENTER_DESCRIPTION(classname,desc,grobs,acked,read,write)                                                \
 113 ADD_THIS_TRANSLATOR (classname);\
 114 SCM                                                                                             \
 115 classname::static_translator_description () const \
 116 {                                                                                               \
 117   SCM  static_properties= SCM_EOL;                                                              \
 118   /*  static_properties= acons (name ,gh_str02scm (Translator::name (self_scm ())),             \
 119                               static_properties_);                                              \
 120   */                                                                                            \
 121   static_properties= scm_acons (ly_symbol2scm ("grobs-created"),                                \
 122                               parse_symbol_list (grobs), static_properties);    \
 123                                                                                                 \
 124   static_properties= scm_acons (ly_symbol2scm ("description"),                                  \
 125                               scm_makfrom0str (desc), static_properties);                               \
 126                                                                                                 \
 127   static_properties= scm_acons (ly_symbol2scm ("interfaces-acked"),                             \
 128                               parse_symbol_list (acked), static_properties);                    \
 129                                                                                                 \
 130   static_properties= scm_acons (ly_symbol2scm ("properties-read"),                              \
 131                               parse_symbol_list (read), static_properties);                     \
 132                                                                                                 \
 133   static_properties= scm_acons (ly_symbol2scm ("properties-written"),                           \
 134                                 parse_symbol_list (write), static_properties);                  \
 135                                                                                                 \
 136   return static_properties;                                                                     \
 137 }
 138
 139
 140
 141 extern Dictionary<Translator*> *global_translator_dict;
 142 void add_translator (Translator*trans);
 143
 144 Translator*get_translator (String s);
 145 DECLARE_UNSMOB(Translator,translator);
 146 #endif // TRANSLATOR_HH