feat(routing): add api to access key segments by name

include/lnm/http/router.h

@@ -8,13 +8,15 @@
 
 typedef struct lnm_http_route lnm_http_route;
 
+typedef struct lnm_http_route_match_segment {
+  size_t start;
+  size_t len;
+} lnm_http_route_match_segment;
+
 typedef struct lnm_http_route_match {
   const lnm_http_route *route;
   lnm_http_method method;
-  struct {
-    size_t start;
-    size_t len;
-  } key_segments[LNM_HTTP_MAX_KEY_SEGMENTS];
+  lnm_http_route_match_segment key_segments[LNM_HTTP_MAX_KEY_SEGMENTS];
 } lnm_http_route_match;
 
 typedef struct lnm_http_router lnm_http_router;
@@ -47,4 +49,7 @@ lnm_http_route_err lnm_http_router_route(lnm_http_route_match *out,
                                          lnm_http_method method,
                                          const char *path);
 
+lnm_err lnm_http_route_match_get(lnm_http_route_match_segment **out,
+                                 lnm_http_route_match *match, const char *key);
+
 #endif

src/http/lnm_http_router.c

@@ -268,3 +268,30 @@ lnm_http_route_err lnm_http_router_route(lnm_http_route_match *out,
 
   return __lnm_http_router_route(out, router, method, path, 0, 0);
 }
+
+lnm_err lnm_http_route_match_get(lnm_http_route_match_segment **out,
+                                 lnm_http_route_match *match, const char *key) {
+  if (match->route->key_segments == NULL) {
+    return lnm_err_not_found;
+  }
+
+  lnm_http_route_segment_trie *trie = match->route->key_segments;
+
+  while (*key != '\0') {
+    trie = trie->children[(unsigned char)*key];
+
+    if (trie == NULL) {
+      return lnm_err_not_found;
+    }
+
+    key++;
+  }
+
+  if (!trie->represents_segment) {
+    return lnm_err_not_found;
+  }
+
+  *out = &match->key_segments[trie->index];
+
+  return lnm_err_ok;
+}

test/routing.c

@@ -28,6 +28,15 @@ void test_routing_simple() {
   TEST_CHECK(match.key_segments[0].len == 8);
   TEST_CHECK(match.key_segments[1].start == 15);
   TEST_CHECK(match.key_segments[1].len == 9);
+
+  lnm_http_route_match_segment *segment;
+  TEST_CHECK(lnm_http_route_match_get(&segment, &match, "second") == lnm_err_ok);
+  TEST_CHECK(segment->start == 15);
+  TEST_CHECK(segment->len == 9);
+  TEST_CHECK(lnm_http_route_match_get(&segment, &match, "yuhh") == lnm_err_not_found);
+  TEST_CHECK(lnm_http_route_match_get(&segment, &match, "hello") == lnm_err_ok);
+  TEST_CHECK(segment->start == 6);
+  TEST_CHECK(segment->len == 8);
 }
 
 TEST_LIST = {