Examples of org.antlr.runtime3_3_0.FailedPredicateException

org.antlr.runtime3_3_0.tree.TreeNodeStream
A semantic predicate failed during validation. Validation of predicates occurs when normally parsing the alternative just like matching a token. Disambiguating predicate evaluation occurs when we hoist a predicate into a prediction decision.

    /** Make stream jump to a new location, saving old location.
     *  Switch back with pop().
     */
    public void push(int index) {
        if ( calls==null ) {
            calls = new IntArray();
        }
        calls.push(p); // save current index
        seek(index);
    }

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  Stack callStack = new Stack();
  List hiddenTokens = new ArrayList();
  int backtracking = 0;


  public ParseTreeBuilder(String grammarName) {
    ParseTree root = create("<grammar "+grammarName+">");
    callStack.push(root);
  }

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  /**  What kind of node to create.  You might want to override
   *   so I factored out creation here.
   */
  public ParseTree create(Object payload) {
    return new ParseTree(payload);
  }

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  public void enterDecision(int d, boolean couldBacktrack) { backtracking++; }
  public void exitDecision(int i) { backtracking--; }


  public void enterRule(String filename, String ruleName) {
    if ( backtracking>0 ) return;
    ParseTree parentRuleNode = (ParseTree)callStack.peek();
    ParseTree ruleNode = create(ruleName);
    parentRuleNode.addChild(ruleNode);
    callStack.push(ruleNode);
  }

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    callStack.push(ruleNode);
  }


  public void exitRule(String filename, String ruleName) {
    if ( backtracking>0 ) return;
    ParseTree ruleNode = (ParseTree)callStack.peek();
    if ( ruleNode.getChildCount()==0 ) {
      ruleNode.addChild(epsilonNode());
    }
    callStack.pop();    
  }

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    callStack.pop();    
  }


  public void consumeToken(Token token) {
    if ( backtracking>0 ) return;
    ParseTree ruleNode = (ParseTree)callStack.peek();
    ParseTree elementNode = create(token);
    elementNode.hiddenTokens = this.hiddenTokens;
    this.hiddenTokens = new ArrayList();
    ruleNode.addChild(elementNode);
  }

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    hiddenTokens.add(token);
  }


  public void recognitionException(RecognitionException e) {
    if ( backtracking>0 ) return;
    ParseTree ruleNode = (ParseTree)callStack.peek();
    ParseTree errorNode = create(e);
    ruleNode.addChild(errorNode);
  }

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    if ( input instanceof TokenStream ) {
      return token.getType();
    }
    else if ( input instanceof TreeNodeStream ) {
      TreeNodeStream nodes = (TreeNodeStream)input;
      TreeAdaptor adaptor = nodes.getTreeAdaptor();
      return adaptor.getType(node);
    }
    else {
      return c;
    }
  }

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  }


  protected void extractInformationFromTreeNodeStream(IntStream input) {
    TreeNodeStream nodes = (TreeNodeStream)input;
    this.node = nodes.LT(1);
    TreeAdaptor adaptor = nodes.getTreeAdaptor();
    Token payload = adaptor.getToken(node);
    if ( payload!=null ) {
      this.token = payload;
      if ( payload.getLine()<= 0 ) {
        // imaginary node; no line/pos info; scan backwards
        int i = -1;
        Object priorNode = nodes.LT(i);
        while ( priorNode!=null ) {
          Token priorPayload = adaptor.getToken(priorNode);
          if ( priorPayload!=null && priorPayload.getLine()>0 ) {
            // we found the most recent real line / pos info
            this.line = priorPayload.getLine();
            this.charPositionInLine = priorPayload.getCharPositionInLine();
            this.approximateLineInfo = true;
            break;
          }
          --i;
          priorNode = nodes.LT(i);
        }
      }
      else { // node created from real token
        this.line = payload.getLine();
        this.charPositionInLine = payload.getCharPositionInLine();
      }
    }
    else if ( this.node instanceof Tree) {
      this.line = ((Tree)this.node).getLine();
      this.charPositionInLine = ((Tree)this.node).getCharPositionInLine();
      if ( this.node instanceof CommonTree) {
        this.token = ((CommonTree)this.node).token;
      }
    }
    else {
      int type = adaptor.getType(this.node);
      String text = adaptor.getText(this.node);
      this.token = new CommonToken(type, text);
    }
  }

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      this.c = input.LA(1);
    }
  }


  protected void extractInformationFromTreeNodeStream(IntStream input) {
    TreeNodeStream nodes = (TreeNodeStream)input;
    this.node = nodes.LT(1);
    TreeAdaptor adaptor = nodes.getTreeAdaptor();
    Token payload = adaptor.getToken(node);
    if ( payload!=null ) {
      this.token = payload;
      if ( payload.getLine()<= 0 ) {
        // imaginary node; no line/pos info; scan backwards
        int i = -1;
        Object priorNode = nodes.LT(i);
        while ( priorNode!=null ) {
          Token priorPayload = adaptor.getToken(priorNode);
          if ( priorPayload!=null && priorPayload.getLine()>0 ) {
            // we found the most recent real line / pos info
            this.line = priorPayload.getLine();
            this.charPositionInLine = priorPayload.getCharPositionInLine();
            this.approximateLineInfo = true;
            break;
          }
          --i;
          priorNode = nodes.LT(i);
        }
      }
      else { // node created from real token
        this.line = payload.getLine();
        this.charPositionInLine = payload.getCharPositionInLine();

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