Expose Ability to Get the Number Of a List Item

src/blocks.c

@@ -336,6 +336,17 @@ static cmark_node *finalize(cmark_parser *parser, cmark_node *b) {
     b->data = cmark_strbuf_detach(node_content);
     break;
 
+  case CMARK_NODE_ITEM:
+    if (parent->as.list.list_type != CMARK_ORDERED_LIST)
+      break;
+
+    if (b->prev == NULL)
+      b->as.item.number = parent->as.list.start;
+    else
+      b->as.item.number = b->prev->as.item.number + 1;
+
+    break;
+
   case CMARK_NODE_LIST:      // determine tight/loose status
     b->as.list.tight = true; // tight by default
     item = b->first_child;

src/cmark.h

@@ -347,6 +347,10 @@ CMARK_EXPORT int cmark_node_get_list_tight(cmark_node *node);
  */
 CMARK_EXPORT int cmark_node_set_list_tight(cmark_node *node, int tight);
 
+/** Returns the list item number of 'node' or 0 if it is not an ordered list.
+ */
+CMARK_EXPORT int cmark_node_get_item_number(cmark_node *node);
+
 /** Returns the info string from a fenced code block.
  */
 CMARK_EXPORT const char *cmark_node_get_fence_info(cmark_node *node);

src/node.c

@@ -482,6 +482,16 @@ int cmark_node_set_list_tight(cmark_node *node, int tight) {
   }
 }
 
+int cmark_node_get_item_number(cmark_node *node) {
+  if (node == NULL)
+    return 0;
+
+  if (node->type == CMARK_NODE_ITEM)
+    return node->as.item.number;
+  else
+    return 0;
+}
+
 const char *cmark_node_get_fence_info(cmark_node *node) {
   if (node == NULL) {
     return NULL;

src/node.h

@@ -36,6 +36,10 @@ typedef struct {
   bool setext;
 } cmark_heading;
 
+typedef struct {
+  int number;
+} cmark_item;
+
 typedef struct {
   unsigned char *url;
   unsigned char *title;
@@ -78,6 +82,7 @@ struct cmark_node {
     cmark_list list;
     cmark_code code;
     cmark_heading heading;
+    cmark_item item;
     cmark_link link;
     cmark_custom custom;
     int html_block_type;