Unicode Character class grammar
whitespace grammar
comment grammar
Documentation comment grammar
It is different with comment grammar,
but Documentation comment grammar rule is included in comment grammar
keyword grammar and keyword tokens are added.
Identifier grammar and token are added
Integer Literal grammar and token are added
unicode escape sequence grammar and token are added.
Real literal grammar and token are added.
Also, Operators and Punctuators are added.
character literals grammar and tokens are added
String literal grammar and token are added.