Examples of org.antlr.v4.runtime.atn.AmbiguityInfo

org.antlr.v4.codegen.model.LeftRecursiveRuleFunction
This class represents profiling event information for an ambiguity. Ambiguities are decisions where a particular input resulted in an SLL conflict, followed by LL prediction also reaching a conflict state (indicating a true ambiguity in the grammar).
This event may be reported during SLL prediction in cases where the conflicting SLL configuration set provides sufficient information to determine that the SLL conflict is truly an ambiguity. For example, if none of the ATN configurations in the conflicting SLL configuration set have traversed a global follow transition (i.e. {@link ATNConfig#reachesIntoOuterContext} is 0 for all configurations), thenthe result of SLL prediction for that input is known to be equivalent to the result of LL prediction for that input.

In some cases, the minimum represented alternative in the conflicting LL configuration set is not equal to the minimum represented alternative in the conflicting SLL configuration set. Grammars and inputs which result in this scenario are unable to use {@link PredictionMode#SLL}, which in turn means they cannot use the two-stage parsing strategy to improve parsing performance for that input.
@see ParserATNSimulator#reportAmbiguity @see ANTLRErrorListener#reportAmbiguity @since 4.3


  @Override
  public Choice getComplexEBNFBlock(GrammarAST ebnfRoot, List<CodeBlockForAlt> alts) {
    int ebnf = 0;
    if ( ebnfRoot!=null ) ebnf = ebnfRoot.getType();
    Choice c = null;
    switch ( ebnf ) {
      case ANTLRParser.OPTIONAL :
        c = new OptionalBlock(this, ebnfRoot, alts);
        break;
      case ANTLRParser.CLOSURE :

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  }


  @Override
  public CodeBlockForAlt alternative(Alternative alt, boolean outerMost) {
    if ( outerMost ) return new CodeBlockForOuterMostAlt(this, alt);
    return new CodeBlockForAlt(this);
  }

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    return alternative(alt, outerMost);
  }


  @Override
  public CodeBlockForAlt alternative(Alternative alt, boolean outerMost) {
    if ( outerMost ) return new CodeBlockForOuterMostAlt(this, alt);
    return new CodeBlockForAlt(this);
  }

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  @Override
  public List<SrcOp> sempred(ActionAST ast) { return list(new SemPred(this, ast)); }


  @Override
  public List<SrcOp> ruleRef(GrammarAST ID, GrammarAST label, GrammarAST args) {
    InvokeRule invokeOp = new InvokeRule(this, ID, label);
    // If no manual label and action refs as token/rule not label, we need to define implicit label
    if ( controller.needsImplicitLabel(ID, invokeOp) ) defineImplicitLabel(ID, invokeOp);
    AddToLabelList listLabelOp = getAddToListOpIfListLabelPresent(invokeOp, label);
    return list(invokeOp, listLabelOp);
  }

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    return getComplexEBNFBlock(ebnfRoot, alts);
  }


  @Override
  public Choice getLL1ChoiceBlock(BlockAST blkAST, List<CodeBlockForAlt> alts) {
    return new LL1AltBlock(this, blkAST, alts);
  }

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    if ( ebnfRoot!=null ) ebnf = ebnfRoot.getType();
    Choice c = null;
    switch ( ebnf ) {
      case ANTLRParser.OPTIONAL :
        if ( alts.size()==1 ) c = new LL1OptionalBlockSingleAlt(this, ebnfRoot, alts);
        else c = new LL1OptionalBlock(this, ebnfRoot, alts);
        break;
      case ANTLRParser.CLOSURE :
        if ( alts.size()==1 ) c = new LL1StarBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);
        break;

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    int ebnf = 0;
    if ( ebnfRoot!=null ) ebnf = ebnfRoot.getType();
    Choice c = null;
    switch ( ebnf ) {
      case ANTLRParser.OPTIONAL :
        if ( alts.size()==1 ) c = new LL1OptionalBlockSingleAlt(this, ebnfRoot, alts);
        else c = new LL1OptionalBlock(this, ebnfRoot, alts);
        break;
      case ANTLRParser.CLOSURE :
        if ( alts.size()==1 ) c = new LL1StarBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);

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      case ANTLRParser.CLOSURE :
        if ( alts.size()==1 ) c = new LL1StarBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);
        break;
      case ANTLRParser.POSITIVE_CLOSURE :
        if ( alts.size()==1 ) c = new LL1PlusBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);
        break;
    }
    return c;
  }

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      case ANTLRParser.OPTIONAL :
        if ( alts.size()==1 ) c = new LL1OptionalBlockSingleAlt(this, ebnfRoot, alts);
        else c = new LL1OptionalBlock(this, ebnfRoot, alts);
        break;
      case ANTLRParser.CLOSURE :
        if ( alts.size()==1 ) c = new LL1StarBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);
        break;
      case ANTLRParser.POSITIVE_CLOSURE :
        if ( alts.size()==1 ) c = new LL1PlusBlockSingleAlt(this, ebnfRoot, alts);
        else c = getComplexEBNFBlock(ebnfRoot, alts);

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  }


  @Override
  public RuleFunction rule(Rule r) {
    if ( r instanceof LeftRecursiveRule ) {
      return new LeftRecursiveRuleFunction(this, (LeftRecursiveRule)r);
    }
    else {
      RuleFunction rf = new RuleFunction(this, r);
      return rf;
    }

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