+ while (1)
+ {
+ if (!gh_pair_p (expr))
+ return;
+
+ SCM head =ly_car (expr);
+ if (unsmob_input (head))
+ {
+ Input * ip = unsmob_input (head);
+
+ output_scheme (scm_list_n (ly_symbol2scm ("define-origin"),
+ scm_makfrom0str (ip->file_string ().to_str0 ()),
+ gh_int2scm (ip->line_number ()),
+ gh_int2scm (ip->column_number ()),
+ SCM_UNDEFINED));
+ expr = ly_cadr (expr);
+ }
+ else if (head == ly_symbol2scm ("no-origin"))
+ {
+ output_scheme (scm_list_n (head, SCM_UNDEFINED));
+ expr = ly_cadr (expr);
+ }
+ else if (head == ly_symbol2scm ("translate-stencil"))
+ {
+ o += ly_scm2offset (ly_cadr (expr));
+ expr = ly_caddr (expr);
+ }
+ else if (head == ly_symbol2scm ("combine-stencil"))
+ {
+ output_expr (ly_cadr (expr), o);
+ expr = ly_caddr (expr);
+ }
+ else
+ {
+ output_scheme (scm_list_n (ly_symbol2scm ("placebox"),
+ gh_double2scm (o[X_AXIS]),
+ gh_double2scm (o[Y_AXIS]),
+ expr,
+ SCM_UNDEFINED));
+ return;
+ }
+ }