lily/grob-property.cc

   1 /*
   2   Implement storage and manipulation of grob properties.
   3 */
   4
   5 #include <cstring>
   6 #include <math.h>
   7
   8 #include "main.hh"
   9 #include "input-smob.hh"
  10 #include "group-interface.hh"
  11 #include "misc.hh"
  12 #include "paper-score.hh"
  13 #include "output-def.hh"
  14 #include "spanner.hh"
  15 #include "item.hh"
  16 #include "misc.hh"
  17 #include "item.hh"
  18
  19 SCM
  20 Grob::get_property_alist_chain (SCM def) const
  21 {
  22   return scm_list_n (mutable_property_alist_,
  23                      immutable_property_alist_,
  24                      def,
  25                      SCM_UNDEFINED);
  26 }
  27
  28 /*
  29   This special add_thing routine is slightly more efficient than
  30
  31   set_prop (name, cons (thing, get_prop (name)))
  32
  33   since it can reuse the handle returned by scm_assq ().
  34 */
  35 void
  36 Grob::add_to_list_property (SCM sym, SCM thing)
  37 {
  38   SCM handle
  39     = scm_sloppy_assq (sym, mutable_property_alist_);
  40
  41   if (handle != SCM_BOOL_F)
  42     {
  43       scm_set_cdr_x (handle, scm_cons (thing, scm_cdr (handle)));
  44     }
  45   else
  46     {
  47       /*
  48         There is no mutable prop yet, so create an entry, and put it in front of the
  49         mutable prop list.
  50       */
  51       handle = scm_sloppy_assq (sym, immutable_property_alist_);
  52       SCM tail = (handle != SCM_BOOL_F) ? scm_cdr (handle) : SCM_EOL;
  53       SCM val = scm_cons (thing, tail);
  54
  55       mutable_property_alist_ = scm_cons (scm_cons (sym, val),
  56                                           mutable_property_alist_);
  57     }
  58 }
  59
  60 extern void check_interfaces_for_property (Grob const *me, SCM sym);
  61
  62 void
  63 Grob::internal_set_property (SCM s, SCM v)
  64 {
  65   /* Perhaps we simply do the assq_set, but what the heck. */
  66   if (!is_live ())
  67     return;
  68
  69   if (do_internal_type_checking_global)
  70     {
  71       if (!type_check_assignment (s, v, ly_symbol2scm ("backend-type?")))
  72         abort ();
  73       check_interfaces_for_property (this, s);
  74     }
  75
  76   mutable_property_alist_ = scm_assq_set_x (mutable_property_alist_, s, v);
  77 }
  78
  79 SCM
  80 Grob::internal_get_property (SCM sym) const
  81 {
  82   SCM s = scm_sloppy_assq (sym, mutable_property_alist_);
  83   if (s != SCM_BOOL_F)
  84     return scm_cdr (s);
  85
  86   s = scm_sloppy_assq (sym, immutable_property_alist_);
  87
  88   if (do_internal_type_checking_global && scm_is_pair (s))
  89     {
  90       if (!type_check_assignment (sym, scm_cdr (s),
  91                                   ly_symbol2scm ("backend-type?")))
  92         abort ();
  93
  94       check_interfaces_for_property (this, sym);
  95     }
  96
  97   return (s == SCM_BOOL_F) ? SCM_EOL : scm_cdr (s);
  98 }
  99
 100 void
 101 Grob::substitute_mutable_properties (SCM crit, SCM orig)
 102 {
 103   set_break_subsititution (crit);
 104   mutable_property_alist_ = substitute_mutable_property_alist (orig);
 105 }
 106
 107 bool
 108 Grob::is_live () const
 109 {
 110   return immutable_property_alist_ != SCM_EOL;
 111 }