ast: implement cleanup callbacks

bshell.runtime/ast/redirection.c

@@ -1,4 +1,5 @@
 #include <bshell/ast.h>
+#include <bshell/parse/lex.h>
 
 static enum bshell_status collect_children(
 	struct bshell_ast_node *node,
@@ -41,9 +42,20 @@ static void to_string(const struct bshell_ast_node *node, fx_bstr *out)
 	}
 }
 
+static enum bshell_status cleanup(struct bshell_ast_node *node)
+{
+	struct bshell_redirection_ast_node *v
+		= (struct bshell_redirection_ast_node *)node;
+	if (v->n_out_tok) {
+		bshell_lex_token_destroy(v->n_out_tok);
+	}
+	return BSHELL_SUCCESS;
+}
+
 struct bshell_ast_node_definition redirection_bshell_ast_node = {
 	.def_id = BSHELL_AST_REDIRECTION,
 	.def_node_size = sizeof(struct bshell_redirection_ast_node),
 	.def_collect_children = collect_children,
 	.def_to_string = to_string,
+	.def_cleanup = cleanup,
 };