hi,
i am currently working on a grammar for a language that has a
different language embedded in it (VHDL 2008 / PSL support) so I ended
up having to switch between lexer states from my parser.
I followed the method descriped in the FAQ
http://www.engr.mun.ca/~theo/JavaCC-FAQ/javacc-faq-moz.htm#tth_sEc3.13but unfortunately the SetState() code seems to be a bit out of date so
I ended up coding my own function for that purpose:
private void SetState(int state) {
if (state != token_source.curLexState) {
int backupCol = jj_nt.beginColumn;
int backupLine = jj_nt.beginLine;
int curCol = stream.getEndColumn();
int curLine = stream.getEndLine();
while (curCol > backupCol || curLine > backupLine) {
stream.backup(1);
curCol = stream.getEndColumn();
curLine = stream.getEndLine();
}
if (curCol == backupCol && curLine == backupLine) {
stream.backup(1);
}
token_source.SwitchTo(state);
jj_nt = token_source.getNextToken();
}
}
basically i am backup up char by char until i reach the start location
of the current token an re-start tokenizing from there. this might not
be the most performant solution (comments/suggestions very welcome!)
but so far it seems to work for me and treats line/col numbers
correctly.
maybe it is time to update the FAQ?
anyway, thanks for this great tools and keep up the good work,
guenter
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