you could also override the nextToken method in your lexer class to overread
tokens until a flag (maybe skip) becomes false:
.@Override
.Token nextToken() {
. do {
. Token = super.nextToken();
. } while (skip == true || token == #if | token == #endif );
. return token;
.}
And in your lexer rules for '#if' and '#endif' you set skip according to the
expression result. And you have to parse your expression to do that. So after
reading the text after '#if' until the end of the line, parse this text to get
the result and set your flag.
cheers
Michael
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