Add serd_node_compare()

2 files changed, 33 insertions, 0 deletions

diff --git a/src/node.c b/src/node.c
index 608f8bfb..fc9869a8 100644
--- a/src/node.c
+++ b/src/node.c
@@ -428,6 +428,33 @@ serd_node_equals(const SerdNode* const a, const SerdNode* const b)
   return true;
 }
 
+int
+serd_node_compare(const SerdNode* const a, const SerdNode* const b)
+{
+  assert(a);
+  assert(b);
+
+  int cmp = 0;
+
+  if ((cmp = ((int)a->type - (int)b->type)) ||
+      (cmp = strcmp(serd_node_string_i(a), serd_node_string_i(b))) ||
+      (cmp = ((int)a->flags - (int)b->flags)) ||
+      !(a->flags & (SERD_HAS_LANGUAGE | SERD_HAS_DATATYPE))) {
+    return cmp;
+  }
+
+  assert(a->flags == b->flags);
+  assert(a->flags & (SERD_HAS_LANGUAGE | SERD_HAS_DATATYPE));
+  assert(b->flags & (SERD_HAS_LANGUAGE | SERD_HAS_DATATYPE));
+  const SerdNode* const ma = serd_node_meta_c(a);
+  const SerdNode* const mb = serd_node_meta_c(b);
+
+  assert(ma->type == mb->type);
+  assert(ma->flags == mb->flags);
+
+  return strcmp(serd_node_string_i(ma), serd_node_string_i(mb));
+}
+
 SerdNode*
 serd_new_uri(const SerdStringView str)
 {
diff --git a/src/node.h b/src/node.h
index eed7cb04..29164dc2 100644
--- a/src/node.h
+++ b/src/node.h
@@ -43,6 +43,12 @@ serd_node_buffer_c(const SerdNode* SERD_NONNULL node)
   return (const char*)(node + 1);
 }
 
+static inline const char* SERD_NONNULL
+serd_node_string_i(const SerdNode* const SERD_NONNULL node)
+{
+  return (const char*)(node + 1);
+}
+
 SerdNode* SERD_ALLOCATED
 serd_node_malloc(size_t length, SerdNodeFlags flags, SerdNodeType type);