Examples of org.antlr.runtime.tree.Tree

org.antlr.runtime.tree.Tree
What does a tree look like? ANTLR has a number of support classes such as CommonTreeNodeStream that work on these kinds of trees. You don't have to make your trees implement this interface, but if you do, you'll be able to use more support code. NOTE: When constructing trees, ANTLR can build any kind of tree; it can even use Token objects as trees if you add a child list to your tokens. This is a tree node without any payload; just navigation and factory stuff.


    // assert tree.getType() == Bst.COMMANDS;


    // Go
    for (int i = 0; i < tree.getChildCount(); i++) {
      Tree child = tree.getChild(i);
      switch (child.getType()) {
      case BstParser.STRINGS:
        strings(child);
        break;
      case BstParser.INTEGERS:
        integers(child);

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   * these variables has a value for each entry on the list.
   */
  private void entry(Tree child) {


    { // Fields first
      Tree t = child.getChild(0);
      // assert t.getType() == Bst.IDLIST;


      for (int i = 0; i < t.getChildCount(); i++) {
        String name = t.getChild(i).getText();


        for (BstEntry entry : entries){
          entry.fields.put(name, null);
        }
      }
    }
    { // Integers
      Tree t = child.getChild(1);
      // assert t.getType() == Bst.IDLIST;


      for (int i = 0; i < t.getChildCount(); i++) {
        String name = t.getChild(i).getText();
        
        for (BstEntry entry : entries){
          entry.integers.put(name, new Integer(0));
        }
      }
    }
    { // Strings
      Tree t = child.getChild(2);
      // assert t.getType() == Bst.IDLIST;


      for (int i = 0; i < t.getChildCount(); i++) {
        String name = t.getChild(i).getText();
        for (BstEntry entry : entries){
          entry.strings.put(name, null);
        }
      }
      for (BstEntry entry : entries){

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    });
  }


  public void executeInContext(Object o, BstEntry context) {
    if (o instanceof Tree) {
      Tree t = (Tree) o;
      new StackFunction(t).execute(context);
    } else if (o instanceof Identifier) {
      execute(((Identifier) o).getName(), context);
    }
  }

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    throw new VMException("No matching identifier found: " + name);
  }


  private void function(Tree child) {
    String name = child.getChild(0).getText();
    Tree stack = child.getChild(1);
    functions.put(name, new StackFunction(stack));


  }

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   * declaration must precede its use.
   * 
   * @param child
   */
  private void integers(Tree child) {
    Tree t = child.getChild(0);
    // assert t.getType() == Bst.IDLIST;


    for (int i = 0; i < t.getChildCount(); i++) {
      String name = t.getChild(i).getText();
      integers.put(name, new Integer(0));
    }
  }

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   * declaration must precede its use.
   * 
   * @param child
   */
  private void strings(Tree child) {
    Tree t = child.getChild(0);
    // assert t.getType() == Bst.IDLIST;


    for (int i = 0; i < t.getChildCount(); i++) {
      String name = t.getChild(i).getText();
      strings.put(name, null);
    }
  }

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    public void execute(BstEntry context) {


      for (int i = 0; i < tree.getChildCount(); i++) {


        Tree c = tree.getChild(i);
        try {


          switch (c.getType()) {
          case BstParser.STRING: {
            String s = c.getText();
            push(s.substring(1, s.length() - 1));
          }
            break;
          case BstParser.INTEGER:
            push(new Integer(Integer.parseInt(c.getText().substring(1))));
            break;
          case BstParser.QUOTED:
            push(new Identifier(c.getText().substring(1)));
            break;
          case BstParser.STACK:
            push(c);
            break;
          default:
            VM.this.execute(c.getText(), context);
          }
        } catch (VMException e) {
          if (file != null) {
            System.err.println("ERROR " + e.getMessage() + " (" + file.getPath() + ":"
              + c.getLine() + ")");
          } else {
            System.err.println("ERROR " + e.getMessage() + " (" + c.getLine() + ")");
          }
          throw e;
        }
      }

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            navBuilder.begin();


            String previousReference = "$1";
            Class activeType = rootType;


            Tree node = tree;


            while (!isLeaf(node))
            {
                GeneratedTerm term = processDerefNode(navBuilder, activeType, node, previousReference, "$1");


                activeType = term.type;


                previousReference = term.termReference;


                // Second term is the continuation, possibly another chained
                // DEREF, etc.
                node = node.getChild(1);
            }


            navBuilder.addln("return %s;", previousReference);


            navBuilder.end();

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        private GeneratedTerm processDerefNode(BodyBuilder builder, Class activeType, Tree node,
                String previousVariableName, String rootName)
        {
            // The first child is the term.


            Tree term = node.getChild(0);


            boolean allowNull = node.getType() == SAFEDEREF;


            // Returns the type of the method/property ... this is the wrapped
            // (i.e. java.lang.Integer) type if

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     *            expression to be evaluated
     * @return the conduit
     */
    private PropertyConduit build(final Class rootClass, String expression)
    {
        Tree tree = parse(expression);


        try
        {
            switch (tree.getType())
            {
                case TRUE:


                    return literalTrue;


                case FALSE:


                    return literalFalse;


                case NULL:


                    return literalNull;


                case INTEGER:


                    // Leading '+' may screw this up.
                    // TODO: Singleton instance for "0", maybe "1"?


                    return createLiteralConduit(Long.class, new Long(tree.getText()));


                case DECIMAL:


                    // Leading '+' may screw this up.
                    // TODO: Singleton instance for "0.0"?


                    return createLiteralConduit(Double.class, new Double(tree.getText()));


                case STRING:


                    return createLiteralConduit(String.class, tree.getText());


                case RANGEOP:


                    Tree fromNode = tree.getChild(0);
                    Tree toNode = tree.getChild(1);


                    // If the range is defined as integers (not properties, etc.)
                    // then it is possible to calculate the value here, once, and not
                    // build a new class.


                    if (fromNode.getType() != INTEGER || toNode.getType() != INTEGER)
                        break;


                    int from = Integer.parseInt(fromNode.getText());
                    int to = Integer.parseInt(toNode.getText());


                    IntegerRange ir = new IntegerRange(from, to);


                    return createLiteralConduit(IntegerRange.class, ir);

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