+
+ sc->set_property (sym, val);
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_grob_set_nested_property_x, "ly:grob-set-nested-property!",
+ 3, 0, 0, (SCM grob, SCM symlist, SCM val),
+ "Set nested property @var{symlist} in grob @var{grob} to value @var{val}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+
+ bool type_ok = ly_cheap_is_list (symlist);
+
+ if (type_ok)
+ for (SCM s = symlist; scm_is_pair (s) && type_ok; s = scm_cdr (s))
+ type_ok &= ly_is_symbol (scm_car (s));
+
+ SCM_ASSERT_TYPE (type_ok, symlist, SCM_ARG2, __FUNCTION__, "list of symbols");
+
+ set_nested_property (sc, symlist, val);
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_grob_pure_property, "ly:grob-pure-property",
+ 4, 1, 0, (SCM grob, SCM sym, SCM beg, SCM end, SCM val),
+ "Return the pure value for property @var{sym} of @var{grob}."
+ " If no value is found, return @var{val} or @code{'()}"
+ " if @var{val} is not specified.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+ LY_ASSERT_TYPE (scm_is_integer, beg, 3);
+ LY_ASSERT_TYPE (scm_is_integer, end, 4);
+ if (val == SCM_UNDEFINED)
+ val = SCM_EOL;
+
+ SCM retval = sc->internal_get_pure_property (sym, scm_to_int (beg), scm_to_int (end));
+ if (retval == SCM_EOL)
+ retval = val;
+
+ return retval;
+}
+
+LY_DEFINE (ly_grob_pure_height, "ly:grob-pure-height",
+ 4, 1, 0, (SCM grob, SCM refp, SCM beg, SCM end, SCM val),
+ "Return the pure height of @var{grob} given refpoint @var{refp}."
+ " If no value is found, return @var{val} or @code{'()}"
+ " if @var{val} is not specified.")
+{
+ Grob *sc = unsmob_grob (grob);
+ Grob *ref = unsmob_grob (refp);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_SMOB (Grob, refp, 2);
+ LY_ASSERT_TYPE (scm_is_integer, beg, 3);
+ LY_ASSERT_TYPE (scm_is_integer, end, 4);
+ if (val == SCM_UNDEFINED)
+ val = SCM_EOL;
+
+ Interval retval = sc->pure_height (ref, scm_to_int (beg), scm_to_int (end));
+
+ return ly_interval2scm (retval);
+}
+
+LY_DEFINE (ly_grob_property, "ly:grob-property",
+ 2, 1, 0, (SCM grob, SCM sym, SCM val),
+ "Return the value for property @var{sym} of @var{grob}."
+ " If no value is found, return @var{val} or @code{'()}"
+ " if @var{val} is not specified.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+ if (val == SCM_UNDEFINED)
+ val = SCM_EOL;
+
+ SCM retval = sc->internal_get_property (sym);
+ if (retval == SCM_EOL)
+ retval = val;
+
+ return retval;
+}
+
+LY_DEFINE (ly_grob_interfaces, "ly:grob-interfaces",
+ 1, 0, 0, (SCM grob),
+ "Return the interfaces list of grob @var{grob}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+
+ return sc->interfaces ();
+}
+
+LY_DEFINE (ly_grob_object, "ly:grob-object",
+ 2, 0, 0, (SCM grob, SCM sym),
+ "Return the value of a pointer in grob @var{grob} of property"
+ " @var{sym}. It returns @code{'()} (end-of-list) if @var{sym}"
+ " is undefined in @var{grob}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+
+ return sc->internal_get_object (sym);
+}
+
+LY_DEFINE (ly_grob_set_object_x, "ly:grob-set-object!",
+ 3, 0, 0, (SCM grob, SCM sym, SCM val),
+ "Set @var{sym} in grob @var{grob} to value @var{val}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
+
+ sc->set_object (sym, val);
+ return SCM_UNSPECIFIED;
+}
+
+/* TODO: make difference between scaled and unscalead variable in
+ calling (i.e different funcs.) */
+LY_DEFINE (ly_grob_layout, "ly:grob-layout",
+ 1, 0, 0, (SCM grob),
+ "Get @code{\\layout} definition from grob @var{grob}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+
+ return sc->layout ()->self_scm ();
+}
+
+LY_DEFINE (ly_grob_alist_chain, "ly:grob-alist-chain",
+ 1, 1, 0, (SCM grob, SCM global),
+ "Get an alist chain for grob @var{grob}, with @var{global} as"
+ " the global default. If unspecified, @code{font-defaults}"
+ " from the layout block is taken.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+
+ if (global == SCM_UNDEFINED)
+ {
+ global = sc->layout ()->lookup_variable (ly_symbol2scm ("font-defaults"));
+ if (global == SCM_UNDEFINED)
+ global = SCM_EOL;
+ }
+
+ return sc->get_property_alist_chain (global);
+}
+
+LY_DEFINE (ly_grob_extent, "ly:grob-extent",
+ 3, 0, 0, (SCM grob, SCM refp, SCM axis),
+ "Get the extent in @var{axis} direction of @var{grob} relative to"
+ " the grob @var{refp}.")
+{
+ Grob *sc = unsmob_grob (grob);
+ Grob *ref = unsmob_grob (refp);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_SMOB (Grob, refp, 2);
+ LY_ASSERT_TYPE (is_axis, axis, 3);
+
+ Axis a = Axis (scm_to_int (axis));
+
+ if (ref->common_refpoint (sc, a) != ref)
+ {
+ // ugh. should use other error message
+ SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
+ }
+ return ly_interval2scm (sc->extent (ref, a));
+}
+
+LY_DEFINE (ly_grob_robust_relative_extent, "ly:grob-robust-relative-extent",
+ 3, 0, 0, (SCM grob, SCM refp, SCM axis),
+ "Get the extent in @var{axis} direction of @var{grob} relative to"
+ " the grob @var{refp}, or @code{(0,0)} if empty.")
+{
+ Grob *sc = unsmob_grob (grob);
+ Grob *ref = unsmob_grob (refp);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_SMOB (Grob, refp, 2);
+ LY_ASSERT_TYPE (is_axis, axis, 3);
+
+ Axis a = Axis (scm_to_int (axis));
+
+ if (ref->common_refpoint (sc, a) != ref)
+ {
+ // ugh. should use other error message
+ SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
+ }
+
+ return ly_interval2scm (robust_relative_extent (sc, ref, a));
+}
+
+LY_DEFINE (ly_grob_relative_coordinate, "ly:grob-relative-coordinate",
+ 3, 0, 0, (SCM grob, SCM refp, SCM axis),
+ "Get the coordinate in @var{axis} direction of @var{grob} relative"
+ " to the grob @var{refp}.")
+{
+ Grob *sc = unsmob_grob (grob);
+ Grob *ref = unsmob_grob (refp);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_SMOB (Grob, refp, 2);
+ LY_ASSERT_TYPE (is_axis, axis, 3);
+
+ Axis a = Axis (scm_to_int (axis));
+
+ if (ref->common_refpoint (sc, a) != ref)
+ {
+ // ugh. should use other error message
+ SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
+ }
+
+ return scm_from_double (sc->relative_coordinate (ref, a));
+}
+
+LY_DEFINE (ly_grob_parent, "ly:grob-parent",
+ 2, 0, 0, (SCM grob, SCM axis),
+ "Get the parent of @var{grob}. @var{axis} is 0 for the X-axis,"
+ " 1@tie{}for the Y-axis.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+
+ Grob *par = sc->get_parent (Axis (scm_to_int (axis)));
+ return par ? par->self_scm () : SCM_EOL;
+}
+
+LY_DEFINE (ly_grob_set_parent_x, "ly:grob-set-parent!",
+ 3, 0, 0, (SCM grob, SCM axis, SCM parent_grob),
+ "Set @var{parent-grob} the parent of grob @var{grob} in axis @var{axis}.")
+{
+ Grob *gr = unsmob_grob (grob);
+ Grob *parent = unsmob_grob (parent_grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+ LY_ASSERT_SMOB (Grob, parent_grob, 3);
+
+ Axis a = Axis (scm_to_int (axis));
+ gr->set_parent (parent, a);