1 files changed, 85 insertions, 0 deletions
diff --git a/app/tree_sitter.c b/app/tree_sitter.c
new file mode 100644
index 0000000..d0f9fa8
--- /dev/null
+++ b/app/tree_sitter.c
@@ -0,0 +1,85 @@
+#include "string.h"
+#include "tree_sitter/api.h"
+
+typedef struct Node {
+  TSPoint start_point;
+  TSPoint end_point;
+  uint32_t start_byte;
+  uint32_t end_byte;
+} Node;
+
+void extract_comments(
+  TSLanguage* language,
+  char* input,
+  Node** out,
+  uint32_t* out_len
+) {
+  TSParser* parser = ts_parser_new();
+  ts_parser_set_language(parser, language);
+  TSTree* tree = ts_parser_parse_string(parser, NULL, input, strlen(input));
+  TSNode root_node = ts_tree_root_node(tree);
+
+  char* pattern = "(comment) @comment";
+  uint32_t error_offset;
+  TSQueryError error_type;
+  TSQuery* query = ts_query_new(language, pattern, strlen(pattern), &error_offset, &error_type);
+  TSQueryCursor* query_cursor = ts_query_cursor_new();
+  ts_query_cursor_exec(query_cursor, query, root_node);
+
+  TSQueryMatch query_match;
+  uint32_t n_max = 1024;
+  *out = malloc(sizeof(Node) * n_max);
+  Node* node = *out;
+  uint32_t n = 0;
+  while (ts_query_cursor_next_match(query_cursor, &query_match)) {
+    if (n >= n_max) {
+      n_max *= 2;
+      *out = realloc(*out, sizeof(Node) * n_max);
+      node = *out + n;
+    }
+    TSNode captured_node = query_match.captures[0].node;
+    node->start_byte = ts_node_start_byte(captured_node);
+    node->end_byte = ts_node_end_byte(captured_node);
+    node->start_point = ts_node_start_point(captured_node);
+    node->end_point = ts_node_end_point(captured_node);
+    node++; n++;
+  }
+  *out_len = n;
+
+  ts_query_cursor_delete(query_cursor);
+  ts_query_delete(query);
+  ts_tree_delete(tree);
+  ts_parser_delete(parser);
+}
+
+void ts_tree_root_node_p(TSTree *tree, TSNode *node) {
+  (*node) = ts_tree_root_node(tree);
+}
+
+uint32_t ts_node_named_child_count_p(TSNode *node) {
+  return ts_node_named_child_count(*node);
+}
+
+uint32_t ts_node_start_byte_p(TSNode *node) {
+  return ts_node_start_byte(*node);
+}
+
+uint32_t ts_node_end_byte_p(TSNode *node) {
+  return ts_node_end_byte(*node);
+}
+
+uint32_t ts_node_start_point_p(TSNode *node, TSPoint *point) {
+  (*point) = ts_node_start_point(*node);
+}
+
+uint32_t ts_node_end_point_p(TSNode *node, TSPoint *point) {
+  (*point) = ts_node_end_point(*node);
+}
+
+const char* ts_node_type_p(TSNode *node) {
+  return ts_node_type(*node);
+}
+
+void ts_node_named_child_p(TSNode* self, uint32_t child_index, TSNode* node) {
+  (*node) = ts_node_named_child(*self, child_index);
+}