The Annoyance Filter.pdf - Fourmilab

§182 ANNOYANCE-FILTER TOKEN PARSER 155
182. The messageQueue can be used to store the lines of a message: “what the parser saw,” after
MIME decoding (but not elision of HTML comments or other processing in the parser itself). This is
handy when debugging the lower level stuff. To enable saving messages in the queue, call setSaveMessage
with an argument of true . The contents of messageQueue may be examined directly (it is a public
member of the class), or written to an ostream with writeMessageQueue . One little detail—if you
examine the messageQueue after the start of the next message in a folder has been detected, the first
line of the next message will be the last item in the message queue; writeMessageQueue understands
this and doesn’t write the line, but if you’re looking at the queue yourself it’s up to you to cope with
this.
〈 Message queue utilities 182 〉 ≡
void setSaveMessage (bool v)
{
saveMessage = v;
source ⃗ setDiagnosticList (saveMessage ? (&messageQueue ) : Λ);
}
bool getSaveMessage (void) const
{
return saveMessage ;
}
void clearMessageQueue (void)
{
if (saveMessage ) {
string s;
}
}
if (isNewMessage ( )) {
s = messageQueue .back ( );
}
messageQueue .clear ( );
if (isNewMessage ( )) {
messageQueue .push back (s);
}
void writeMessageQueue (ostream &os )
{
list〈string〉::size type l = messageQueue .size ( ), n = 0;
for (list〈string〉::iterator p = messageQueue .begin ( ); p ≠ messageQueue .end ( ); p++, n++) {
if (¬((n ≡ (l − 1)) ∧ (p ⃗ substr (0, (sizeof messageSentinel ) − 1) ≡ messageSentinel ))) {
os ≪ ∗p ≪ endl ;
}
}
}
This code is used in section 173.