[antlr-interest] tree walker executes method call twice?

[Jim Idle]

Safiye Celik wrote:
> Hi,
> How do you create DoubleWalk1.jpg tree? I wanna display my tree as 
> yours which is more understandable for a human, but I cannot get such 
> a tree. I use JTree component constructed from a DefaultTreeModel 
> component, and the tree I get is as in the attachment, which is in 
> expandable folder format and not readable enough. And I could not find 
> any component in Java to display a tree as yours. I would be glad if 
> you share your way. Thanks.
Search the past posting for how to generate a dot (www.graphviz.org) 
specification from the AST and then run dot:

 // Use the ANLTR built in dot generator
                    //
                    DOTTreeGenerator gen = new DOTTreeGenerator();
                   
                    // Which we can cause to generate the DOT specification
                    // with the input file name suffixed with .dot. You 
can then use
                    // the graphviz tools or zgrviewer (Java) to view 
the grahpical
                    // version of the dot file.
                    //
                    source = source.substring(0, source.length()-3);
                    String outputName = source + "dot";
                   
                    System.out.println("    Producing AST dot (graphviz) 
file");
                   
                    // It produces a jguru string template.
                    //
                    StringTemplate st = gen.toDOT(t, new 
CommonTreeAdaptor(), _treeST, _edgeST);

                    // Create the output file and write the dot spec to it
                    //
                    FileWriter outputStream = new FileWriter(outputName);
                    outputStream.write(st.toString());
                    outputStream.close();

                    // Invoke dot to generate a .png file
                    //
                    System.out.println("    Producing png graphic for 
tree");
                    pStart = System.currentTimeMillis();
                    Process proc = Runtime.getRuntime().exec("dot -Tpng 
-o" + source + "png " + outputName);
                    proc.waitFor();
                    stop = System.currentTimeMillis();
                    System.out.println("      PNG graphic produced in " 
+ (stop - pStart) + "ms.");


Jim