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Emit a RangeTransition instead of SetTransition if a set has only one interval

This commit is contained in:
Sam Harwell 2012-07-31 09:06:18 -05:00
parent 8c820269e4
commit 170a8347bb
1 changed files with 20 additions and 2 deletions
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22
tool/src/org/antlr/v4/automata/LexerATNFactory.java
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@ -34,7 +34,17 @@ import org.antlr.v4.codegen.CodeGenerator;
import org.antlr.v4.misc.CharSupport; import org.antlr.v4.misc.CharSupport;
import org.antlr.v4.parse.ANTLRParser; import org.antlr.v4.parse.ANTLRParser;
import org.antlr.v4.runtime.CharStream; import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.atn.*; import org.antlr.v4.runtime.atn.ATN;
import org.antlr.v4.runtime.atn.ATNState;
import org.antlr.v4.runtime.atn.ActionTransition;
import org.antlr.v4.runtime.atn.AtomTransition;
import org.antlr.v4.runtime.atn.NotSetTransition;
import org.antlr.v4.runtime.atn.RangeTransition;
import org.antlr.v4.runtime.atn.RuleStartState;
import org.antlr.v4.runtime.atn.SetTransition;
import org.antlr.v4.runtime.atn.TokensStartState;
import org.antlr.v4.runtime.atn.Transition;
import org.antlr.v4.runtime.misc.Interval;
import org.antlr.v4.runtime.misc.IntervalSet; import org.antlr.v4.runtime.misc.IntervalSet;
import org.antlr.v4.tool.Grammar; import org.antlr.v4.tool.Grammar;
import org.antlr.v4.tool.LexerGrammar; import org.antlr.v4.tool.LexerGrammar;
@ -178,7 +188,15 @@ public class LexerATNFactory extends ParserATNFactory {
left.addTransition(new NotSetTransition(right, set)); left.addTransition(new NotSetTransition(right, set));
} }
else { else {
left.addTransition(new SetTransition(right, set)); Transition transition;
if (set.getIntervals().size() == 1) {
Interval interval = set.getIntervals().get(0);
transition = new RangeTransition(right, interval.a, interval.b);
} else {
transition = new SetTransition(right, set);
}
left.addTransition(transition);
} }
associatedAST.atnState = left; associatedAST.atnState = left;
return new Handle(left, right); return new Handle(left, right);