+struct Parser_signature
+{
+ char *symbol;
+ int token_type;
+};
+static SCM signature_hash_table;
+
+static void init_signature_hash_table ()
+{
+ signature_hash_table = scm_gc_protect_object (scm_c_make_hash_table (31));
+ Parser_signature sigs[] = {
+ {"scm", MUSIC_FUNCTION_SCM},
+ {"music", MUSIC_FUNCTION_MUSIC},
+ {"scm-music", MUSIC_FUNCTION_SCM_MUSIC},
+ {"scm-scm", MUSIC_FUNCTION_SCM_SCM},
+ {"music-music", MUSIC_FUNCTION_MUSIC_MUSIC},
+ {"scm-music-music", MUSIC_FUNCTION_SCM_MUSIC_MUSIC},
+ {"scm-scm-music-music", MUSIC_FUNCTION_SCM_SCM_MUSIC_MUSIC},
+ {"scm-scm-music", MUSIC_FUNCTION_SCM_SCM_MUSIC},
+ {"scm-scm-scm-music", MUSIC_FUNCTION_SCM_SCM_SCM_SCM_MUSIC},
+ {"scm-scm-scm-scm-music", MUSIC_FUNCTION_SCM_SCM_SCM_MUSIC},
+ {"scm-scm-scm", MUSIC_FUNCTION_SCM_SCM_SCM},
+ {"markup", MUSIC_FUNCTION_MARKUP},
+ {"markup-music", MUSIC_FUNCTION_MARKUP_MUSIC},
+ {"markup-markup", MUSIC_FUNCTION_MARKUP_MARKUP},
+ {"markup-music-music", MUSIC_FUNCTION_MARKUP_MUSIC_MUSIC},
+ {"markup-markup-music", MUSIC_FUNCTION_MARKUP_MARKUP_MUSIC},
+ {"noarg", MUSIC_FUNCTION},
+ {0,0}
+ };
+
+ for (int i = 0; sigs[i].symbol; i++)
+ scm_hashq_set_x (signature_hash_table, scm_gc_protect_object (ly_symbol2scm (sigs[i].symbol)),
+ scm_from_int (sigs[i].token_type));
+}
+
+int
+music_function_type (SCM func)
+{
+ if (!signature_hash_table)
+ init_signature_hash_table ();
+
+ SCM type = scm_object_property (func, ly_symbol2scm ("music-function-signature-keyword"));
+ SCM token_type = scm_hashq_ref (signature_hash_table, type, SCM_BOOL_F);
+ if (!scm_is_number (token_type))
+ {
+ programming_error (_ ("can't find signature for music function"));
+ return MUSIC_FUNCTION_SCM;
+ }
+
+ return scm_to_int (token_type);
+}
+