diff options
| -rw-r--r-- | include/serd/serd.h | 12 | ||||
| -rw-r--r-- | src/node.c | 25 |
2 files changed, 37 insertions, 0 deletions
diff --git a/include/serd/serd.h b/include/serd/serd.h index 6aeb9138..4cf00f02 100644 --- a/include/serd/serd.h +++ b/include/serd/serd.h @@ -1033,6 +1033,18 @@ serd_node_equals(const SerdNode* SERD_NULLABLE a, const SerdNode* SERD_NULLABLE b); /** + Compare two nodes. + + Returns less than, equal to, or greater than zero if `a` is less than, equal + to, or greater than `b`, respectively. NULL is treated as less than any + other node. +*/ +SERD_PURE_API +int +serd_node_compare(const SerdNode* SERD_NULLABLE a, + const SerdNode* SERD_NULLABLE b); + +/** @} @defgroup serd_event Event Handlers @{ @@ -436,6 +436,31 @@ serd_node_equals(const SerdNode* a, const SerdNode* b) return serd_node_total_size(b) == a_size && !memcmp(a, b, a_size); } +int +serd_node_compare(const SerdNode* a, const SerdNode* b) +{ + if (a == b) { + return 0; + } + + if (!a) { + return -1; + } + + if (!b) { + return 1; + } + + if (a->type != b->type) { + return (a->type < b->type) ? -1 : 1; + } + + const int cmp = strcmp(serd_node_string(a), serd_node_string(b)); + return cmp ? cmp + : serd_node_compare(serd_node_maybe_get_meta_c(a), + serd_node_maybe_get_meta_c(b)); +} + SerdNode* serd_new_uri(const SerdStringView str) { |