Lots of work on the lua read-eval-print loop

luprex/cpp/core/util.hpp

@@ -106,6 +106,14 @@ bool is_lua_classname(string_view s);
 // Return true if the line of code is a lua comment.
 bool is_lua_comment(string_view s);
 
+// Return true if the line of code could be the beginning of a long expression.
+// In a read-eval-print loop, if the user types something like "function foo",
+// that's not a complete lua expression.  But we don't want to just print an error,
+// we want to give the user a chance to continue typing so that he can turn it
+// into a complete lua expression.  This function returns true if the string looks
+// like the beginning of a long lua expression.  This is only a heuristic.
+bool is_possible_long_lua_expression(string_view s);
+
 // Return true if the line is entirely whitespace.
 bool is_whitespace(string_view s);