NewLexer create a new lexer and init specialSet and whitespaceSet.

true, false.

# this is a comment.

end of file.

1.23, 1.23e-10.

123.

id, name, age, email, createdAt, role, user_name.

"hello", "world", "123", "1.23", "1.23e-10".

null.

$id.