-LY_DEFINE(ly_get_grob_property,
- "ly-get-grob-property", 2, 0, 0, (SCM grob, SCM sym),
- "Get the value of a value in grob @var{g} of property @var{sym}. It
-will return @code{'()} (end-of-list) if @var{g} doesn't have @var{sym} set.
+LY_DEFINE (ly_grob_property, "ly:grob-property",
+ 2, 1, 0, (SCM grob, SCM sym, SCM deflt),
+ "Return the value of a value in grob @var{g} of property @var{sym}. "
+ "It will return @code{'()} or @var{deflt} (if specified) "
+ "if @var{sym} is undefined in @var{g}."
+ "\n\n")
+{
+ Grob *sc = unsmob_grob (grob);
+ SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
+ SCM_ASSERT_TYPE (scm_is_symbol (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");
+ if (deflt == SCM_UNDEFINED)
+ deflt = SCM_EOL;
+
+ SCM retval = sc->internal_get_property (sym);
+ if (retval == SCM_EOL)
+ retval = deflt;
+
+ 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);
+ SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
+
+ 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{g} of property @var{sym}. "
+ "It will return @code{' ()} (end-of-list) "
+ "if @var{sym} is undefined in @var{g}."
+ "\n\n")
+{
+ Grob *sc = unsmob_grob (grob);
+ SCM_ASSERT_TYPE (sc, grob, SCM_ARG1, __FUNCTION__, "grob");
+ SCM_ASSERT_TYPE (scm_is_symbol (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");