1 files changed, 54 insertions, 0 deletions
diff --git a/src/compare.h b/src/compare.h
new file mode 100644
index 00000000..eabbf43e
--- /dev/null
+++ b/src/compare.h
@@ -0,0 +1,54 @@
+/*
+  Copyright 2011-2021 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SERD_COMPARE_H
+#define SERD_COMPARE_H
+
+#include "serd/serd.h"
+
+/// Compare statements lexicographically, ignoring graph
+SERD_PURE_FUNC
+int
+serd_triple_compare(const void* x, const void* y, const void* user_data);
+
+/**
+   Compare statments with statement patterns lexicographically, ignoring graph.
+
+   Null nodes in the second argument are treated as wildcards, always less than
+   any node.
+*/
+SERD_PURE_FUNC
+int
+serd_triple_compare_pattern(const void* x,
+                            const void* y,
+                            const void* user_data);
+
+/// Compare statements lexicographically
+SERD_PURE_FUNC
+int
+serd_quad_compare(const void* x, const void* y, const void* user_data);
+
+/**
+   Compare statments with statement patterns lexicographically.
+
+   Null nodes in the second argument are treated as wildcards, always less than
+   any node.
+*/
+SERD_PURE_FUNC
+int
+serd_quad_compare_pattern(const void* x, const void* y, const void* user_data);
+
+#endif // SERD_COMPARE_H