lily/include/context.hh

   1 /*
   2   context.hh -- declare  Context
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #ifndef CONTEXT_HH
  10 #define CONTEXT_HH
  11
  12 #include "duration.hh"
  13 #include "lily-proto.hh"
  14 #include "listener.hh"
  15 #include "moment.hh"
  16 #include "scm-hash.hh"
  17 #include "std-vector.hh"
  18 #include "virtual-methods.hh"
  19
  20 class Context
  21 {
  22   Scheme_hash_table *properties_dict () const;
  23   Context (Context const &src);
  24
  25   DECLARE_SMOBS (Context);
  26   DECLARE_CLASSNAME(Context);
  27   void terminate ();
  28
  29 private:
  30   friend class Context_handle;
  31   int iterator_count_;
  32
  33   /* Used internally by create_context */
  34   Stream_event *infant_event_;
  35
  36 protected:
  37   Context *daddy_context_;
  38   /* The used Context_def */
  39   SCM definition_;
  40   /* Additions to the Context_def, given by \with */
  41   SCM definition_mods_;
  42
  43   SCM properties_scm_;
  44   SCM context_list_;
  45   SCM accepts_list_;
  46   SCM aliases_;
  47   Translator_group *implementation_;
  48   string id_string_;
  49
  50   /* Events reported in the context is sent to this dispatcher. */
  51   Dispatcher *event_source_;
  52
  53   /* Events reported to this context or recursively in any of its
  54      children, are sent to this dispatcher. */
  55   Dispatcher *events_below_;
  56
  57   // Translator_group is allowed to set implementation_.
  58   friend class Translator_group;
  59   // Context_def::instantiate initialises some protected members.
  60   friend class Context_def;
  61   // UGH! initialises implementation_
  62   friend SCM ly_make_global_translator (SCM);
  63
  64   DECLARE_LISTENER (set_property_from_event);
  65   DECLARE_LISTENER (unset_property_from_event);
  66
  67 public:
  68   string id_string () const { return id_string_; }
  69   SCM children_contexts () const { return context_list_; }
  70   SCM default_child_context_name () const;
  71
  72   Dispatcher *event_source () const { return event_source_; }
  73   Dispatcher *events_below () const { return events_below_; }
  74   void internal_send_stream_event (SCM type, Input *origin, SCM props[]);
  75
  76   SCM get_definition () const { return definition_; }
  77   SCM get_definition_mods () const { return definition_mods_; }
  78
  79   Translator_group *implementation () const { return implementation_; }
  80   Context *get_parent_context () const;
  81   Context ();
  82
  83   /* properties:  */
  84   SCM internal_get_property (SCM name_sym) const;
  85   SCM properties_as_alist () const;
  86   Context *where_defined (SCM name_sym, SCM *value) const;
  87   void unset_property (SCM var_sym);
  88
  89   void instrumented_set_property (SCM, SCM, const char*, int, const char*);
  90   void internal_set_property (SCM var_sym, SCM value);
  91
  92   Context *create_context (Context_def *, string, SCM);
  93   DECLARE_LISTENER (create_context_from_event);
  94   DECLARE_LISTENER (acknowledge_infant);
  95   DECLARE_LISTENER (remove_context);
  96   DECLARE_LISTENER (change_parent);
  97   void disconnect_from_parent ();
  98   void check_removal ();
  99   string context_name () const;
 100   SCM context_name_symbol () const;
 101   Global_context *get_global_context () const;
 102
 103   virtual Context *get_score_context () const;
 104   virtual Output_def *get_output_def () const;
 105   virtual Moment now_mom () const;
 106   virtual Context *get_default_interpreter ();
 107
 108   bool is_alias (SCM) const;
 109   void add_alias (SCM);
 110   void add_context (Context *trans);
 111   bool is_bottom_context () const;
 112   bool is_removable () const;
 113
 114   Context *find_create_context (SCM context_name,
 115                                 string id, SCM ops);
 116   Context *create_unique_context (SCM context_name, string context_id,
 117                                   SCM ops);
 118   vector<Context_def*> path_to_acceptable_context (SCM alias) const;
 119 };
 120
 121 /*
 122   Context arg?
 123 */
 124
 125 void apply_property_operations (Context *tg, SCM pre_init_ops);
 126 void execute_revert_property (Context *context,
 127                               SCM context_property,
 128                               SCM grob_property_path);
 129 void execute_pushpop_property (Context *trg, SCM prop, SCM eltprop, SCM val);
 130 void sloppy_general_pushpop_property (Context *context,
 131                                        SCM context_property, SCM grob_property_path, SCM val);
 132 SCM updated_grob_properties (Context *tg, SCM sym);
 133 Context *find_context_below (Context *where,
 134                              SCM type_sym, string id);
 135 bool melisma_busy (Context *);
 136
 137 Context *get_voice_to_lyrics (Context *lyrics);
 138 Grob *get_current_note_head (Context *voice);
 139 Grob *get_current_rest (Context *voice);
 140 DECLARE_UNSMOB (Context, context);
 141
 142 Moment measure_position (Context const *context);
 143 Moment measure_position (Context const *context, Duration const *dur);
 144 Rational measure_length (Context const *context);
 145 int measure_number (Context const *context);
 146 void set_context_property_on_children (Context *trans, SCM sym, SCM val);
 147
 148 /* Shorthand for creating and broadcasting stream events. */
 149 #define send_stream_event(ctx, type, origin, ...)                               \
 150 {                                                                       \
 151   SCM props[] = { __VA_ARGS__, 0 };                                     \
 152   ctx->internal_send_stream_event (ly_symbol2scm (type), origin, props);        \
 153 }
 154
 155 SCM nested_property_alist (SCM alist, SCM prop_path, SCM value);
 156 SCM nested_property_revert_alist (SCM alist, SCM prop_path);
 157 SCM evict_from_alist (SCM, SCM, SCM);
 158
 159 #endif /* CONTEXT_HH */
 160