diff options
| -rw-r--r-- | slv2/plugin.h | 12 | ||||
| -rw-r--r-- | src/plugin.c | 25 |
2 files changed, 37 insertions, 0 deletions
diff --git a/slv2/plugin.h b/slv2/plugin.h index 3a386fc..e4e5984 100644 --- a/slv2/plugin.h +++ b/slv2/plugin.h @@ -194,6 +194,18 @@ slv2_plugin_get_value_for_subject(SLV2Plugin p, const char* predicate); +/** Return whether a feature is supported by a plugin. + * + * This will return true if the feature is an optional or required feature + * of the plugin. + * + * Time = Query + */ +bool +slv2_plugin_has_feature(SLV2Plugin p, + const char* feature); + + /** Get the LV2 Features supported (required or optionally) by a plugin. * * A feature is "supported" by a plugin if it is required OR optional. diff --git a/src/plugin.c b/src/plugin.c index bd7f89e..babb65a 100644 --- a/src/plugin.c +++ b/src/plugin.c @@ -528,6 +528,31 @@ slv2_plugin_get_latency_port(SLV2Plugin p) return slv2_value_as_int(val); } + +bool +slv2_plugin_has_feature(SLV2Plugin p, + const char* feature) +{ + assert(feature); + + const char* const query = slv2_strjoin( + "ASK {\n" + " { <> lv2:optionalFeature <", feature, "> }\n" + " UNION\n" + " { <> lv2:requiredFeature <", feature, "> }\n" + "}\n", NULL); + + + librdf_query_results* results = slv2_plugin_query(p, query); + assert(librdf_query_results_is_boolean(results)); + + const bool ret = results && (librdf_query_results_get_boolean(results) > 0); + + librdf_free_query_results(results); + + return ret; +} + SLV2Values slv2_plugin_get_supported_features(SLV2Plugin p) |