| Methods Summary |
|---|
| protected persistence.antlr.CommonHiddenStreamToken | LA(int i)
return nextMonitoredToken;
|
| protected void | consume()
nextMonitoredToken = (CommonHiddenStreamToken)input.nextToken();
|
| private void | consumeFirst()
consume(); // get first token of input stream
// Handle situation where hidden or discarded tokens
// appear first in input stream
CommonHiddenStreamToken p = null;
// while hidden or discarded scarf tokens
while (hideMask.member(LA(1).getType()) || discardMask.member(LA(1).getType())) {
if (hideMask.member(LA(1).getType())) {
if (p == null) {
p = LA(1);
}
else {
p.setHiddenAfter(LA(1));
LA(1).setHiddenBefore(p); // double-link
p = LA(1);
}
lastHiddenToken = p;
if (firstHidden == null) {
firstHidden = p; // record hidden token if first
}
}
consume();
}
|
| public persistence.antlr.collections.impl.BitSet | getDiscardMask()
return discardMask;
|
| public persistence.antlr.CommonHiddenStreamToken | getHiddenAfter(persistence.antlr.CommonHiddenStreamToken t)Return a ptr to the hidden token appearing immediately after
token t in the input stream.
return t.getHiddenAfter();
|
| public persistence.antlr.CommonHiddenStreamToken | getHiddenBefore(persistence.antlr.CommonHiddenStreamToken t)Return a ptr to the hidden token appearing immediately before
token t in the input stream.
return t.getHiddenBefore();
|
| public persistence.antlr.collections.impl.BitSet | getHideMask()
return hideMask;
|
| public persistence.antlr.CommonHiddenStreamToken | getInitialHiddenToken()Return the first hidden token if one appears
before any monitored token.
return firstHidden;
|
| public void | hide(persistence.antlr.collections.impl.BitSet mask)
hideMask = mask;
|
| public void | hide(int m)
hideMask.add(m);
|
| public persistence.antlr.Token | nextToken()Return the next monitored token.
Test the token following the monitored token.
If following is another monitored token, save it
for the next invocation of nextToken (like a single
lookahead token) and return it then.
If following is unmonitored, nondiscarded (hidden)
channel token, add it to the monitored token.
Note: EOF must be a monitored Token.
// handle an initial condition; don't want to get lookahead
// token of this splitter until first call to nextToken
if (LA(1) == null) {
consumeFirst();
}
// we always consume hidden tokens after monitored, thus,
// upon entry LA(1) is a monitored token.
CommonHiddenStreamToken monitored = LA(1);
// point to hidden tokens found during last invocation
monitored.setHiddenBefore(lastHiddenToken);
lastHiddenToken = null;
// Look for hidden tokens, hook them into list emanating
// from the monitored tokens.
consume();
CommonHiddenStreamToken p = monitored;
// while hidden or discarded scarf tokens
while (hideMask.member(LA(1).getType()) || discardMask.member(LA(1).getType())) {
if (hideMask.member(LA(1).getType())) {
// attach the hidden token to the monitored in a chain
// link forwards
p.setHiddenAfter(LA(1));
// link backwards
if (p != monitored) { //hidden cannot point to monitored tokens
LA(1).setHiddenBefore(p);
}
p = lastHiddenToken = LA(1);
}
consume();
}
return monitored;
|
