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addDFAEdge needs to return the true target state of the added edge

This commit is contained in:
Sam Harwell 2013-04-18 12:39:12 -05:00
parent 74f4938033
commit 2410b97aab
1 changed files with 8 additions and 7 deletions
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15
runtime/Java/src/org/antlr/v4/runtime/atn/ParserATNSimulator.java
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@ -700,7 +700,7 @@ public class ParserATNSimulator extends ATNSimulator {
input.seek(startIndex);
BitSet alts = evalSemanticContext(D.predicates, outerContext, true);
D.prediction = ATN.INVALID_ALT_NUMBER; // indicate we have preds
addDFAEdge(dfa, previousD, t, D);
D = addDFAEdge(dfa, previousD, t, D);
switch (alts.cardinality()) {
case 0:
throw noViableAlt(input, outerContext, D.configs, startIndex);
@ -718,7 +718,7 @@ public class ParserATNSimulator extends ATNSimulator {
}
// all adds to dfa are done after we've created full D state
addDFAEdge(dfa, previousD, t, D);
D = addDFAEdge(dfa, previousD, t, D);
if ( D.isAcceptState ) return predictedAlt;
previous = reach;
@ -1547,13 +1547,13 @@ public class ParserATNSimulator extends ATNSimulator {
return alt;
}
protected void addDFAEdge(@NotNull DFA dfa,
@Nullable DFAState from,
int t,
@Nullable DFAState to)
protected DFAState addDFAEdge(@NotNull DFA dfa,
@Nullable DFAState from,
int t,
@Nullable DFAState to)
{
if ( debug ) System.out.println("EDGE "+from+" -> "+to+" upon "+getTokenName(t));
if ( from==null || t < -1 || to == null ) return;
if ( from==null || t < -1 || to == null ) return to;
to = addDFAState(dfa, to); // used existing if possible not incoming
synchronized (from) {
if ( from.edges==null ) {
@ -1562,6 +1562,7 @@ public class ParserATNSimulator extends ATNSimulator {
from.edges[t+1] = to; // connect
}
if ( debug ) System.out.println("DFA=\n"+dfa.toString(parser!=null?parser.getTokenNames():null));
return to;
}
/** Add D if not there and return D. Return previous if already present. */