Examples of org.antlr.v4.runtime.misc.ParseCancellationException

org.antlr.v4.runtime.tree.ParseTreeWalker
This exception is thrown to cancel a parsing operation. This exception does not extend {@link RecognitionException}, allowing it to bypass the standard error recovery mechanisms. {@link BailErrorStrategy} throws this exception inresponse to a parse error. @author Sam Harwell

    public void recover(Parser recognizer, RecognitionException e) {
    for (ParserRuleContext context = recognizer.getContext(); context != null; context = context.getParent()) {
      context.exception = e;
    }


        throw new ParseCancellationException(e);
    }

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    InputMismatchException e = new InputMismatchException(recognizer);
    for (ParserRuleContext context = recognizer.getContext(); context != null; context = context.getParent()) {
      context.exception = e;
    }


        throw new ParseCancellationException(e);
    }

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        return new BailErrorStrategy() { /* bail out at the first parse error */
            private void bail(Parser recognizer, Exception exc) {
                List<String> stack = recognizer.getRuleInvocationStack();
                Collections.reverse(stack);
                // TODO use recognizer.getRuleContext().toInfoString(recognizer); as the diagnostic ?
                throw new ParseCancellationException((exc.getMessage() != null ? exc.getMessage() + "; " : "") + (exc.getCause().getMessage() != null ? exc.getCause().getMessage() + "; " : "") + "in " + stack, exc.getCause());
            }


            @Override public void recover(Parser recognizer, RecognitionException e) {
                try {
                    super.recover(recognizer, e);    // TODO remove this call?

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                }


                sb.append(additionalHint);
                underlineError(sb, recognizer, offendingToken);


                throw new ParseCancellationException(
                        sb.toString(),
                        exc.getCause()
                    );
            }

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  public void exitFunction(final FunctionContext ctx) {
    final Token start = ctx.getStart();
    final String[] split = start.getText().split("\\(");
    final String functionName = split[0];
    if (!FunctionFactory.containsFunction(functionName)) {
      throw new ParseCancellationException(String.format("%s is not a valid function", functionName));
    }
  }

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            final int lineNumber = mOffset + aLine;
            final Token token = (Token) aOffendingSymbol;


            if (JAVADOC_MISSED_HTML_CLOSE.equals(aMsg)) {
                log(lineNumber, JAVADOC_MISSED_HTML_CLOSE, token.getText());
                throw new ParseCancellationException();
            }
            else if (JAVADOC_WRONG_SINGLETON_TAG.equals(aMsg)) {
                log(lineNumber, JAVADOC_WRONG_SINGLETON_TAG, token.getText());
                throw new ParseCancellationException();
            }
            else {
                final RuleContext ruleContext = aEx.getCtx();
                if (ruleContext != null) {
                    final int ruleIndex = aEx.getCtx().getRuleIndex();

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          }
        }
      }
      if(arg0.getParent() instanceof ExpressionContext) {
        // we are the leftmost child of the expression
        ParseTree chld = arg0.getParent().getChild(arg0.getParent().getChildCount()-1);
        if(!chld.equals(arg0)) return;
        addQuery(classUtils.expandExpression(arg0.getParent().getText(), registry));
      }
    }
  }

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//    parser.setTokenFactory(factory);
    parser.addErrorListener(new DiagnosticErrorListener());
    parser.getInterpreter().setPredictionMode(
        PredictionMode.LL_EXACT_AMBIG_DETECTION);
    parser.setBuildParseTree(true);
    ParseTree tree = parser.mson();
    // show tree in text form
    // System.out.println(tree.toStringTree(parser));


    ParseTreeWalker walker = new ParseTreeWalker();
    SymbolTable symtab = new SymbolTable();

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    JavaParser parser = new JavaParser(tokens);
    parser.removeErrorListeners();
    
    // start parsing at the compilationUnit rule
    ParserRuleContext t = parser.compilationUnit();
    ParseTreeWalker walker = new ParseTreeWalker();
    List<AutocompleteCandidate> q = new ArrayList<AutocompleteCandidate>();
          
    ImportDeclarationCompletion extractor = new ImportDeclarationCompletion(txt,cur,registry,cps,cu);
    NameBuilder extractor2 = new NameBuilder(registry,cu );
    NodeCompletion extractor3 = new NodeCompletion(txt,cur, registry, cu);
    walker.walk(extractor, t);
    if(extractor.getQuery()!=null)
      q.addAll(extractor.getQuery());
    walker.walk(extractor2, t);
    walker.walk(extractor3, t);
    if(extractor3.getQuery()!=null)
      q.addAll(extractor3.getQuery());
    List<String> ret = registry.searchCandidates(q);


    // this shows the GUI

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    parser.setBuildParseTree(true);
    ParseTree tree = parser.mson();
    // show tree in text form
    // System.out.println(tree.toStringTree(parser));


    ParseTreeWalker walker = new ParseTreeWalker();
    SymbolTable symtab = new SymbolTable();
    DefPhase def = new DefPhase(symtab);
    walker.walk(def, tree);
    // create next phase and feed symbol table info from def to ref phase
    RefPhase ref = new RefPhase(symtab, def.scopes);
    walker.walk(ref, tree);
  }

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Related Classes of org.antlr.v4.runtime.misc.ParseCancellationException

org.antlr.runtime.ANTLRFileStream

org.antlr.runtime.ANTLRStringStream

org.antlr.runtime.CharStream

org.antlr.runtime.CommonToken

org.antlr.runtime.tree.CommonTree

org.antlr.runtime.tree.CommonTreeNodeStream

org.antlr.runtime.tree.Tree

org.antlr.runtime.tree.TreeVisitor

org.antlr.v4.analysis.LeftRecursionDetector

org.antlr.v4.analysis.LeftRecursiveRuleAltInfo

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