template ::=
	comment |
	section |
	text |
	formatter |
	partial;

comment ::= prefix comment_symbol anything suffix;

prefix ::= "{";

comment_symbol ::= "-";

(**
 * anything ::= /[\S\s]+/
 * Actually it is not contains `suffix`
 *)

suffix ::= "}";

section ::=
	section_head
		template
	[section_else
		template]
	section_tail;

section_head ::= prefix compare_symbol name suffix;

compare_symbol ::= "?" | "!";

name ::= anything;

section_else ::= prefix else_symbol name suffix;

else_symbol ::= "*";

section_tail ::= pretix end_symbol name suffix;

end_symbol ::= "/";

text ::= anything;

formatter ::= prefix [raw_symbol] name suffix;

raw_symbol ::= "#";

partial ::= prefix partial_symbol name suffix;

partial_symbol ::= "@";