1 files changed, 10 insertions, 0 deletions

diff --git a/src/yuescript/ast.hpp b/src/yuescript/ast.hpp
index c6da312..f59b50f 100644
--- a/src/yuescript/ast.hpp
+++ b/src/yuescript/ast.hpp
@@ -597,4 +597,14 @@ private:
 */
 ast_node* parse(input& i, rule& g, error_list& el, void* ud);
 
+/** check if the start part of given input matches grammar.
+        The parse procedures of each rule parsed are executed
+        before this function returns, if parsing succeeds.
+        @param i input.
+        @param g root rule of grammar.
+        @param ud user data, passed to the parse procedures.
+        @return true on parsing success, false on failure.
+*/
+ast_node* start_with(input& i, rule& g, error_list& el, void* ud);
+
 } // namespace parserlib