jasder
/
antlr
1
0
Fork 1
Code Issues Pull Requests Releases 1 Wiki Activity

Fixes to LexerATNSimulator.closure, fixes to non-greedy positive closure

This commit is contained in:
Sam Harwell 2012-10-15 02:01:07 -05:00
parent a40073a8cc
commit 6fa853c14f
2 changed files with 27 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
runtime/Java/src/org/antlr/v4/runtime/atn/LexerATNSimulator.java
View File

@ -568,10 +568,15 @@ public class LexerATNSimulator extends ATNSimulator {
}
}
if ( config.context == null || config.context.isEmpty() ) {
configs.add(config);
return;
if ( config.context == null || config.context.hasEmpty() ) {
if (config.context == null || config.context.isEmpty()) {
configs.add(config);
return;
}
configs.add(new LexerATNConfig(config, config.state, PredictionContext.EMPTY));
}
if ( config.context!=null && !config.context.isEmpty() ) {
for (SingletonPredictionContext ctx : config.context) {
if ( !ctx.isEmpty() ) {
@ -603,8 +608,8 @@ public class LexerATNSimulator extends ATNSimulator {
}
ATNState p = config.state;
boolean nonGreedy = p instanceof DecisionState && ((DecisionState)p).nonGreedy
|| p instanceof PlusBlockStartState && ((PlusBlockStartState)p).loopBackState.nonGreedy;
boolean nonGreedy = (p instanceof DecisionState && ((DecisionState)p).nonGreedy && !(p instanceof PlusLoopbackState))
|| (p instanceof PlusBlockStartState && ((PlusBlockStartState)p).loopBackState.nonGreedy);
for (int i=0; i<p.getNumberOfTransitions(); i++) {
Transition t = p.transition(i);
LexerATNConfig c = getEpsilonTarget(config, t, configs);
@ -627,7 +632,7 @@ public class LexerATNSimulator extends ATNSimulator {
ATNState p = config.state;
switch (p.getStateType()) {
case ATNState.PLUS_LOOP_BACK:
if (t.target instanceof PlusBlockStartState && ((PlusBlockStartState)t.target).nonGreedy) {
if (((PlusLoopbackState)p).nonGreedy) {
config = config.exitNonGreedyBlock();
}
@ -638,9 +643,18 @@ public class LexerATNSimulator extends ATNSimulator {
break;
case ATNState.LOOP_END:
ATNState loopEntry = ((LoopEndState)p).loopBackState.transition(0).target;
if (loopEntry instanceof StarLoopEntryState && ((StarLoopEntryState)loopEntry).nonGreedy) {
config = config.exitNonGreedyBlock();
ATNState loopBackState = ((LoopEndState)p).loopBackState;
if (loopBackState instanceof PlusLoopbackState) {
if (((PlusLoopbackState)loopBackState).nonGreedy) {
config = config.exitNonGreedyBlock();
}
}
else {
assert loopBackState instanceof StarLoopbackState;
ATNState loopEntry = loopBackState.transition(0).target;
if (loopEntry instanceof StarLoopEntryState && ((StarLoopEntryState)loopEntry).nonGreedy) {
config = config.exitNonGreedyBlock();
}
}
break;

4
runtime/Java/src/org/antlr/v4/runtime/atn/PredictionContext.java
View File

@ -70,6 +70,10 @@ public abstract class PredictionContext implements Iterable<SingletonPredictionC
return this == EMPTY;
}
public boolean hasEmpty() {
return getInvokingState(size() - 1) == EMPTY_INVOKING_STATE;
}
public abstract PredictionContext popAll(
int invokingState,
boolean fullCtx,