#define flag -#1
#define		exec x
#define mode flag(#1)#2
#define		user U
#define		meta M
#define add +#1
#define del -#1
#define		unix_lf z
#define 	keepnl n
#define		tri #1#2#3
#define 	comment c
#define 	string s
#define		quote q
#define		eval S
#define		evalquote Q
#define stack bal_stack bal_unstack
#define meta_grammar meta_start meta_end meta_arg_start meta_sep meta_arg_end stack
#define user_grammar call_start call_end arg_start arg_sep arg_end stack arg_num_char quote_char
