After a call to the nextToken method, this field
contains the type of the token just read. For a single character
token, its value is the single character, converted to an integer.
For a quoted string token (see , its value is the quote character.
Otherwise, its value is one of the following:
TT_WORD indicates that the token is a word.
TT_NUMBER indicates that the token is a number.
TT_EOL indicates that the end of line has been read.
The field can only have this value if the
eolIsSignificant method has been called with the
argument true.
TT_EOF indicates that the end of the input stream
has been reached.