Examples of org.antlr.runtime.tree.TreeVisitor.visit()

Class org.antlr.runtime.tree.TreeVisitor

Examples of org.antlr.runtime.tree.TreeVisitor.visit()

org.antlr.runtime.tree.TreeVisitor.visit()
Visit every node in tree t and trigger an action for each node before/after having visited all of its children. Execute both actions even if t has no children. If a child visit yields a new child, it can update its parent's child list or just return the new child. The child update code works even if the child visit alters its parent and returns the new tree. Return result of applying post action to this node.

     *  Parameter must be a token.
     *  todo: do we want?
     */
    public void expandParameterizedLoops(GrammarAST root) {
        TreeVisitor v = new TreeVisitor(new GrammarASTAdaptor());
        v.visit(root, new TreeVisitorAction() {
            @Override
            public Object pre(Object t) {
                if ( ((GrammarAST)t).getType() == 3 ) {
                    return expandParameterizedLoop((GrammarAST)t);
                }

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    /** Utility visitor that sets grammar ptr in each node */
  public static void setGrammarPtr(final Grammar g, GrammarAST tree) {
    if ( tree==null ) return;
    // ensure each node has pointer to surrounding grammar
    TreeVisitor v = new TreeVisitor(new GrammarASTAdaptor());
    v.visit(tree, new TreeVisitorAction() {
      @Override
      public Object pre(Object t) { ((GrammarAST)t).g = g; return t; }
      @Override
      public Object post(Object t) { return t; }
    });

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  }


  private static int countAllTreeTokens(CommonTokenStream tokens, CommonTree tree) {
    CountNodesAction action = new CountNodesAction(tokens);
    TreeVisitor visitor = new TreeVisitor();
    visitor.visit(tree, action);
    return action.getCount();
  }


  private static CommonTokenStream createTokenStream(String text) {
    ANTLRStringStream input = new ANTLRStringStream(text);

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