lily/grob-property.cc

   1 /*
   2   Implement storage and manipulation of grob properties.
   3  */
   4
   5 #include <string.h>
   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 "paper-def.hh"
  14 #include "grob.hh"
  15 #include "spanner.hh"
  16 #include "item.hh"
  17 #include "misc.hh"
  18 #include "item.hh"
  19
  20
  21 SCM
  22 Grob::get_property_alist_chain (SCM def) const
  23 {
  24   return  scm_list_n (mutable_property_alist_,
  25                       immutable_property_alist_,
  26                       def,
  27                       SCM_UNDEFINED);
  28 }
  29
  30
  31
  32 /*
  33   This special add_thing routine is slightly more efficient than
  34
  35     set_prop (name,cons (thing, get_prop (name)))
  36
  37   since it can reuse the handle returned by scm_assq().
  38 */
  39 void
  40 Grob::add_to_list_property (SCM sym, SCM thing)
  41 {
  42   SCM handle
  43     = scm_sloppy_assq (sym, mutable_property_alist_)
  44     ;
  45
  46   if (handle != SCM_BOOL_F)
  47     {
  48       gh_set_cdr_x (handle, gh_cons (thing, gh_cdr (handle)));
  49     }
  50   else
  51     {
  52       /*
  53         There is no mutable prop yet, so create an entry, and put it in front of the
  54         mutable prop list.
  55       */
  56       handle = scm_sloppy_assq (sym, immutable_property_alist_);
  57       SCM tail = (handle != SCM_BOOL_F) ? gh_cdr(handle) : SCM_EOL;
  58       SCM val = gh_cons (thing, tail);
  59
  60       mutable_property_alist_ = gh_cons (gh_cons (sym, val),
  61                                          mutable_property_alist_);
  62     }
  63 }
  64
  65
  66 extern void check_interfaces_for_property (Grob const *me, SCM sym);
  67
  68 void
  69 Grob::internal_set_grob_property (SCM s, SCM v)
  70 {
  71   /* Perhaps we simply do the assq_set, but what the heck. */
  72   if (!live ())
  73     return;
  74
  75   if (internal_type_checking_global_b)
  76     {
  77       if (!type_check_assignment (s, v, ly_symbol2scm ("backend-type?")))
  78         abort ();
  79       check_interfaces_for_property (this, s);
  80     }
  81
  82   mutable_property_alist_ = scm_assq_set_x (mutable_property_alist_, s, v);
  83 }
  84
  85
  86 SCM
  87 Grob::internal_get_grob_property (SCM sym) const
  88 {
  89   SCM s = scm_sloppy_assq (sym, mutable_property_alist_);
  90   if (s != SCM_BOOL_F)
  91     return ly_cdr (s);
  92
  93   s = scm_sloppy_assq (sym, immutable_property_alist_);
  94
  95   if (internal_type_checking_global_b && gh_pair_p (s))
  96     {
  97       if (!type_check_assignment (sym, gh_cdr (s),
  98                                   ly_symbol2scm ("backend-type?")))
  99         abort ();
 100       check_interfaces_for_property (this, sym);
 101     }
 102
 103   return (s == SCM_BOOL_F) ? SCM_EOL : ly_cdr (s);
 104 }
 105
 106 void
 107 Grob::substitute_mutable_properties (SCM crit, SCM orig)
 108 {
 109   set_break_subsititution(crit);
 110   mutable_property_alist_ = substitute_mutable_property_alist (orig);
 111 }
 112
 113
 114 bool
 115 Grob::live () const
 116 {
 117   return immutable_property_alist_ != SCM_EOL;
 118 }