lily/grob-scheme.cc

   1 #include "grob.hh"
   2 #include "warn.hh"
   3 #include "spanner.hh"
   4 #include "item.hh"
   5 #include "paper-def.hh"
   6 #include "system.hh"
   7
   8 LY_DEFINE(ly_set_grob_property,"ly-set-grob-property!", 3, 0, 0,
   9   (SCM grob, SCM sym, SCM val),
  10   "Set @var{sym} in grob @var{grob} to value @var{val}")
  11 {
  12   Grob * sc = unsmob_grob (grob);
  13   SCM_ASSERT_TYPE(sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  14   SCM_ASSERT_TYPE(gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  15
  16   if (!type_check_assignment (sym, val, ly_symbol2scm ("backend-type?")))
  17     error ("typecheck failed");
  18
  19   sc->internal_set_grob_property (sym, val);
  20   return SCM_UNSPECIFIED;
  21 }
  22
  23 LY_DEFINE(ly_get_grob_property,
  24           "ly-get-grob-property", 2, 0, 0, (SCM grob, SCM sym),
  25           "Get the value of a value in grob @var{g} of property @var{sym}. It
  26 will return @code{'()} (end-of-list) if @var{g} doesn't have @var{sym} set.
  27
  28 Grob properties are stored as GUILE association lists, with symbols as
  29 keys. All lookup functions identify undefined properties with
  30 end-of-list (i.e. @code{'()} in Scheme or @code{SCM_EOL} in C)
  31
  32 Properties are stored in two ways:
  33 @itemize @bullet
  34 @item mutable properties.
  35 Grob properties that change from object to object. The storage of
  36 these are private to a grob. For example pointers to other grobs are
  37 always stored in the mutable properties.
  38
  39 @item immutable properties.
  40 Grob properties that are shared across different grobs of the same
  41 type. The storage is shared, and hence it is read-only. Typically, this
  42 is used to store function callbacks, and default settings. They are
  43 initially read from @file{scm/grob-description.scm}.
  44 @end itemize
  45
  46 ")
  47 {
  48   Grob * sc = unsmob_grob (grob);
  49   SCM_ASSERT_TYPE(sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  50   SCM_ASSERT_TYPE(gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  51
  52   return sc->internal_get_grob_property (sym);
  53 }
  54
  55 LY_DEFINE(spanner_get_bound, "ly-get-spanner-bound", 2 , 0, 0,
  56           (SCM slur, SCM dir),
  57           "Get one of the bounds of @var{spanner}. @var{dir} may be @code{-1} for
  58 left, and @code{1} for right.
  59 ")
  60 {
  61   Spanner * sl = dynamic_cast<Spanner*> (unsmob_grob (slur));
  62   SCM_ASSERT_TYPE(sl, slur, SCM_ARG1, __FUNCTION__, "spanner grob");
  63   SCM_ASSERT_TYPE(ly_dir_p (dir), slur, SCM_ARG2, __FUNCTION__, "dir");
  64   return sl->get_bound (to_dir (dir))->self_scm ();
  65 }
  66
  67 LY_DEFINE(ly_get_paper_var,"ly-get-paper-variable", 2, 0, 0,
  68   (SCM grob, SCM sym),
  69   "Get a variable from the \\paper block.")
  70 {
  71   Grob * sc = unsmob_grob (grob);
  72   SCM_ASSERT_TYPE(sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  73   SCM_ASSERT_TYPE(gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
  74
  75   return sc->get_paper () ->get_scmvar_scm (sym);
  76 }
  77
  78
  79
  80 LY_DEFINE(ly_get_extent, "ly-get-extent", 3, 0, 0,
  81           (SCM grob, SCM refp, SCM axis),
  82           "Get the extent in @var{axis} direction of @var{grob} relative to the
  83 grob @var{refp}")
  84 {
  85   Grob * sc = unsmob_grob (grob);
  86   Grob * ref = unsmob_grob (refp);
  87   SCM_ASSERT_TYPE(sc, grob, SCM_ARG1, __FUNCTION__, "grob");
  88   SCM_ASSERT_TYPE(ref, refp, SCM_ARG2, __FUNCTION__, "grob");
  89
  90   SCM_ASSERT_TYPE(ly_axis_p (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
  91
  92   return ly_interval2scm ( sc->extent (ref, Axis (gh_scm2int (axis))));
  93 }
  94
  95 LY_DEFINE (ly_get_parent,   "ly-get-parent", 2, 0, 0, (SCM grob, SCM axis),
  96            "Get the parent of @var{grob}.  @var{axis} can be 0 for the X-axis, 1
  97 for the Y-axis.")
  98 {
  99   Grob * sc = unsmob_grob (grob);
 100   SCM_ASSERT_TYPE(sc, grob, SCM_ARG1, __FUNCTION__, "grob");
 101   SCM_ASSERT_TYPE(ly_axis_p (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
 102
 103   Grob * par = sc->get_parent (Axis (gh_scm2int (axis)));
 104   return par ? par->self_scm() : SCM_EOL;
 105 }
 106
 107 /* ly prefix? */
 108 LY_DEFINE (get_system,
 109            "get-system",
 110            1, 0, 0, (SCM grob),
 111            "
 112 Return the System Grob of @var{grob}.
 113 ")
 114 {
 115   Grob *me = unsmob_grob (grob);
 116   SCM_ASSERT_TYPE (me, grob, SCM_ARG1, __FUNCTION__, "grob");
 117
 118   if (System *g = me->get_system ())
 119     return g->self_scm ();
 120
 121   return SCM_EOL;
 122 }
 123
 124 /* ly prefix? */
 125 LY_DEFINE (get_original,
 126            "get-original",
 127            1, 0, 0, (SCM grob),
 128            "
 129 Return the original Grob of @var{grob}
 130 ")
 131 {
 132   Grob *me = unsmob_grob (grob);
 133   SCM_ASSERT_TYPE (me, grob, SCM_ARG1, __FUNCTION__, "grob");
 134   return me->original_ ? me->original_->self_scm () : me->self_scm ();
 135 }
 136
 137
 138 /* ly prefix? spanner in name? */
 139 /*
 140   TODO: maybe we should return a vector -- random access is more
 141   logical for this list?
 142  */
 143
 144 LY_DEFINE (get_broken_into,
 145           "get-broken-into", 1, 0, 0, (SCM spanner),
 146            "
 147 Return broken-into list for @var{spanner}.
 148 "
 149 )
 150 {
 151   ///  Spanner *me = unsmob_spanner (spanner);
 152   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (spanner));
 153   SCM_ASSERT_TYPE (me, spanner, SCM_ARG1, __FUNCTION__, "spanner");
 154
 155   SCM s = SCM_EOL;
 156   for (int i = me->broken_intos_.size (); i; i--)
 157     s = gh_cons (me->broken_intos_[i-1]->self_scm (), s);
 158   return s;
 159 }
 160