add_offset_callback (Grob *g, SCM proc, Axis a)
{
SCM data = g->get_property_data (axis_offset_symbol (a));
+ if (!scm_is_number (data)
+ && !ly_is_procedure (data)
+ && !is_simple_closure (data))
+ {
+ g->set_property (axis_offset_symbol (a), proc);
+ return ;
+ }
+
if (ly_is_procedure (data))
data = ly_make_simple_closure (scm_list_1 (data));
else if (is_simple_closure (data))
data = simple_closure_expression (data);
- else if (!scm_is_number (data))
- g->internal_set_property (axis_offset_symbol (a),
- proc);
- else
- {
- SCM plus = ly_lily_module_constant ("+");
- SCM expr = scm_list_3 (plus,
- ly_make_simple_closure (scm_list_1 (proc)),
- data);
- g->internal_set_property (axis_offset_symbol (a),
- ly_make_simple_closure (expr));
- }
+
+ SCM plus = ly_lily_module_constant ("+");
+
+ if (ly_is_procedure (proc))
+ proc = ly_make_simple_closure (scm_list_1 (proc));
+
+ SCM expr = scm_list_3 (plus, proc, data);
+ g->set_property (axis_offset_symbol (a), ly_make_simple_closure (expr));
}
*/
void
-chain_offset_callback (Grob *g, SCM proc, Axis a)
+chain_callback (Grob *g, SCM proc, SCM sym)
{
- SCM data = g->get_property_data (axis_offset_symbol (a));
+ SCM data = g->get_property_data (sym);
if (ly_is_procedure (data))
data = ly_make_simple_closure (scm_list_1 (data));
else if (is_simple_closure (data))
data = simple_closure_expression (data);
- else if (!scm_is_number (data))
- data = scm_from_int (0);
-
+ else
+ /*
+ Data may be nonnumber. In that case, it is assumed to be
+ undefined.
+ */
+
+ data = SCM_UNDEFINED;
+
SCM expr = scm_list_2 (proc, data);
- g->internal_set_property (axis_offset_symbol (a),
-
- // twice: one as a wrapper for grob property routines,
- // once for the actual delayed binding.
- ly_make_simple_closure (ly_make_simple_closure (expr)));
+ g->set_property (sym,
+
+ // twice: one as a wrapper for grob property routines,
+ // once for the actual delayed binding.
+ ly_make_simple_closure (ly_make_simple_closure (expr)));
+}
+
+void
+chain_offset_callback (Grob *g, SCM proc, Axis a)
+{
+ chain_callback (g, proc, axis_offset_symbol (a));
}