Performing a query in tree-sitter

ts_query.c

#include <stdint.h>
#include <stdio.h>
#include <tree_sitter/api.h>
#include <tree_sitter/tree-sitter-c.h>

int main() {
  // Create a Tree-sitter parser
  const TSLanguage *language = tree_sitter_c();
  TSParser *parser = ts_parser_new();
  ts_parser_set_language(parser, language);

  // Parse some code
  TSTree *tree = ts_parser_parse_string(parser, NULL, "int x = 5;", 10);
  TSNode root_node = ts_tree_root_node(tree);

  // Create a query
  uint32_t error_offset = 0;
  TSQueryError error_type = 0;
  TSQuery *query = ts_query_new
    (language,
     "(declaration) @declarations",
     27,
     &error_offset,
     &error_type);

  // Run the query
  TSQueryCursor *cursor = ts_query_cursor_new();
  ts_query_cursor_exec(cursor, query, root_node);

  printf("error_offset: %d, error_type: %d\n", error_offset, error_type);

  // Iterate over the results
  TSQueryMatch match = (TSQueryMatch) {};
  while (ts_query_cursor_next_match(cursor, &match)) {
    for (int i = 0; i < match.capture_count; i++) {
      TSQueryCapture capture = match.captures[i];
      printf("match: %s\n", ts_node_string(capture.node));
    }
  }

  printf("done\n");

  // Clean up
  ts_query_cursor_delete(cursor);
  ts_query_delete(query);
  ts_parser_delete(parser);
  ts_language_delete(language);

  return 0;
}