+ replace_special_characters (str, props);
+
+ /*
+ We want to filter strings with a music font that pass through
+ the text interface. Here the font encoding is checked to see
+ if it matches one of the music font encodings. --pmccarty
+ */
+ SCM encoding = ly_chain_assoc_get (ly_symbol2scm ("font-encoding"),
+ props,
+ SCM_BOOL_F);
+ SCM music_encodings = Lily::all_music_font_encodings;
+
+ SCM features = ly_chain_assoc_get (ly_symbol2scm ("font-features"),
+ props,
+ SCM_BOOL_F);
+
+ // The font-features value is stored in a scheme list. This joins the entries
+ // with commas for processing with pango.
+ string features_str = string ();
+ if (scm_is_pair (features))
+ {
+ bool first = true;
+ for (SCM s = features; scm_is_pair (s); s = scm_cdr (s))
+ {
+ SCM feature = scm_car (s);
+ if (scm_is_string (feature))
+ {
+ if (first)
+ {
+ first = false;
+ }
+ else
+ {
+ features_str += ",";
+ }
+ features_str += ly_scm2string (feature);
+ }
+ else
+ {
+ scm_misc_error (__FUNCTION__, "Found non-string in font-features list", SCM_EOL);
+ }
+ }
+ }
+ else if (!scm_is_false (features))
+ {
+ scm_misc_error (__FUNCTION__, "Expecting a list for font-features value", SCM_EOL);
+ }
+
+ bool is_music = scm_is_true (scm_memq (encoding, music_encodings));
+ return fm->text_stencil (layout, str, is_music, features_str).smobbed_copy ();